zxbparser.py

#!/usr/bin/env python3

# --------------------------------------------------------------------
# SPDX-License-Identifier: AGPL-3.0-or-later
# © Copyright 2008-2024 José Manuel Rodríguez de la Rosa and contributors.
# See the file CONTRIBUTORS.md for copyright details.
# See https://www.gnu.org/licenses/agpl-3.0.html for details.
# --------------------------------------------------------------------

import math
import sys
from collections.abc import Callable
from math import pi as PI

# typings
from typing import NamedTuple, cast

import src.api.config
import src.api.dataref
import src.api.options
import src.api.utils

# Symbol Classes
from src import arch

# Global containers
from src.api import errmsg, opcodestemps
from src.api import global_ as gl
from src.api.check import (
    check_and_make_label,
    check_class,
    common_type,
    is_dynamic,
    is_ender,
    is_null,
    is_number,
    is_numeric,
    is_static,
    is_static_str,
    is_string,
    is_unsigned,
)
from src.api.config import OPTIONS
from src.api.constants import CLASS, CONVENTION, SCOPE, TYPE, LoopType
from src.api.debug import __DEBUG__
from src.api.errmsg import error, warning
from src.api.global_ import LoopInfo

# Compiler API
from src.api.symboltable.symboltable import SymbolTable

# Lexers and parsers, etc
from src.ply import yacc
from src.symbols import sym
from src.symbols.id_ import SymbolID
from src.symbols.symbol_ import Symbol
from src.symbols.type_ import Type
from src.zxbc import zxblex
from src.zxbc.zxblex import tokens  # noqa

# ----------------------------------------------------------------------
# Function level entry ID in which scope we are into. If the list
# is empty, we are at global scope
# ----------------------------------------------------------------------
FUNCTION_LEVEL: list[SymbolID] = gl.FUNCTION_LEVEL

# ----------------------------------------------------------------------
# Function calls pending to check
# Each scope pushes (prepends) an empty list
# ----------------------------------------------------------------------
FUNCTION_CALLS = gl.FUNCTION_CALLS

# ----------------------------------------------------------------------
# Initialization routines to be called automatically at program start
# ----------------------------------------------------------------------
INITS = gl.INITS

# ----------------------------------------------------------------------
# Global Symbol Table
# ----------------------------------------------------------------------
SYMBOL_TABLE = gl.SYMBOL_TABLE = SymbolTable()

# ----------------------------------------------------------------------
# Defined user labels. They all are prepended _label_. Line numbers 10,
# 20, 30... are in the form: __label_10, __label_20, __label_30...
# ----------------------------------------------------------------------
LABELS = {}

# ----------------------------------------------------------------------
# True if we're in the middle of a LET sentence. False otherwise.
# ----------------------------------------------------------------------
LET_ASSIGNMENT: bool = False

# ----------------------------------------------------------------------
# True if PRINT sentence has been used.
# ----------------------------------------------------------------------
PRINT_IS_USED: bool = False

# ----------------------------------------------------------------------
# Last line number output for checking program key board BREAK
# ----------------------------------------------------------------------
last_brk_linenum: int = 0


# ----------------------------------------------------------------------
# Start of parsing
# ----------------------------------------------------------------------


class Id(NamedTuple):
    """Encapsulates an ID name and its line number where it was read"""

    name: str
    lineno: int


def init():
    """Initializes parser state"""
    global LABELS
    global LET_ASSIGNMENT
    global PRINT_IS_USED
    global SYMBOL_TABLE

    global ast
    global data_ast
    global optemps
    global last_brk_linenum

    LABELS = {}
    LET_ASSIGNMENT = False
    PRINT_IS_USED = False
    last_brk_linenum = 0

    ast = None
    data_ast = None  # Global Variables AST
    opcodestemps.init()
    optemps = opcodestemps.OpcodesTemps()

    gl.INITS.clear()
    del gl.FUNCTION_CALLS[:]
    del gl.FUNCTION_LEVEL[:]
    del gl.FUNCTIONS[:]
    SYMBOL_TABLE = gl.SYMBOL_TABLE = src.api.symboltable.symboltable.SymbolTable()

    # DATAs info
    gl.DATA_LABELS_REQUIRED.clear()
    gl.DATA_LABELS.clear()
    gl.DATA_IS_USED = False
    del gl.DATAS[:]
    gl.DATA_PTR_CURRENT = src.api.utils.current_data_label()
    gl.DATA_FUNCTIONS = []
    gl.error_msg_cache.clear()


# ----------------------------------------------------------------------
# "Macro" functions. Just return more complex expressions
# ----------------------------------------------------------------------
def _TYPE(type_: TYPE) -> sym.TYPE | None:
    """returns an internal type converted to a SYMBOL_TABLE type."""
    assert isinstance(type_, TYPE)
    return SYMBOL_TABLE.basic_types[type_]


def _TYPEREF(type_: TYPE, *, implicit: bool = True) -> sym.TYPEREF:
    """Returns a typing annotation"""
    return sym.TYPEREF(_TYPE(type_), 0, implicit=implicit)


# ----------------------------------------------------------------------
# Utils
# ----------------------------------------------------------------------
def mark_entry_as_accessed(entry: sym.ID):
    """Marks the entry as accessed (needed) only if in the global
    scope
    """
    assert isinstance(entry, sym.ID)
    if FUNCTION_LEVEL and entry.token == "FUNCTION":  # Not in global scope
        return
    entry.accessed = True


def convert_to_function(entry: sym.ID, class_: CLASS, lineno: int):
    """The given entry is converted to function if it is not already."""
    assert class_ in (CLASS.function, CLASS.sub)

    if check_class(entry, class_, lineno):
        if entry.class_ == class_:
            return

        entry.to_function(lineno, class_=class_)


# ----------------------------------------------------------------------
# Wrapper functions to make AST nodes
# ----------------------------------------------------------------------
def make_nop():
    """NOP does nothing."""
    return sym.NOP()


def make_number(value, lineno: int, type_=None):
    """Wrapper: creates a constant number node."""
    return sym.NUMBER(value, type_=type_, lineno=lineno)


def make_typecast(type_: sym.TYPING, node: sym.EXPR | None, lineno: int) -> sym.TYPECAST | sym.EXPR | None:
    """Wrapper: returns a Typecast node"""
    if node is None or node.type_ is None:
        return None  # syntax / semantic error

    if isinstance(type_, sym.TYPEREF):
        type_ = type_.type_

    assert isinstance(type_, sym.TYPE)

    result = sym.TYPECAST.make_node(type_, node, lineno)
    assert isinstance(result, None | sym.TYPECAST | sym.EXPR), f"{result.__class__.__name__} != TYPECAST | EXPR"

    return result


def make_binary(lineno: int, operator, left, right, func=None, type_=None):
    """Wrapper: returns a Binary node"""
    return sym.BINARY.make_node(operator, left, right, lineno, func, type_)


def make_unary(
    lineno: int,
    operator: str,
    operand: sym.EXPR | None,
    func=Callable,
    type_: sym.TYPE | None = None,
) -> sym.UNARY | sym.NUMBER | sym.STRING | None:
    """Wrapper: returns a Unary node"""
    if operand is None:  # syntax / semantic error
        return None

    return sym.UNARY.make_node(lineno, operator, operand, func, type_)


def make_builtin(
    lineno: int,
    fname: str,
    operands: Symbol | tuple | list | None,
    func: Callable | None = None,
    type_: sym.TYPE | None = None,
) -> sym.BUILTIN | sym.NUMBER:
    """Wrapper: returns a Builtin function node.
    Can be a Symbol, tuple, or list of Symbols
    If operand is an iterable, they will be expanded.
    """
    if operands is None:
        operands = []

    assert isinstance(operands, Symbol | tuple | list)
    assert isinstance(type_, sym.TYPE | None)

    # TODO: In the future, builtin functions will be implemented in an external stdlib, like POINT or ATTR
    __DEBUG__(f'Creating BUILTIN "{fname}"', 1)
    if not isinstance(operands, list | tuple):
        operands = [operands]

    return sym.BUILTIN.make_node(lineno, fname, func, type_, *operands)


def make_constexpr(lineno, expr):
    return sym.CONSTEXPR(expr, lineno=lineno)


def make_strslice(lineno: int, s, lower, upper):
    """Wrapper: returns String Slice node"""
    return sym.STRSLICE.make_node(lineno, s, lower, upper)


def make_sentence(lineno: int, sentence: str, *args, sentinel=False):
    """Wrapper: returns a Sentence node"""
    return sym.SENTENCE(lineno, gl.FILENAME, sentence, *args, is_sentinel=sentinel)


def make_asm_sentence(asm: str, lineno: int, sentinel: bool = False):
    """Creates a node for an ASM inline sentence"""
    return sym.ASM(asm, lineno, gl.FILENAME, is_sentinel=sentinel)


def make_block(*args):
    """Wrapper: Creates a chain of code blocks."""
    return sym.BLOCK.make_node(*args)


def make_var_declaration(entry):
    """This will return a node with a var declaration.
    The children node contains the symbol table entry.
    """
    return sym.VARDECL(entry)


def make_array_declaration(entry: sym.ID) -> sym.ARRAYDECL:
    """This will return a node with the symbol as an array."""
    return sym.ARRAYDECL(entry)


def make_func_declaration(
    func_name: str,
    lineno: int,
    class_: CLASS,
    type_: sym.TYPEREF | None = None,
) -> sym.FUNCDECL | None:
    """This will return a node with the symbol as a function or sub."""
    return sym.FUNCDECL.make_node(func_name, lineno, class_, type_=type_)


def make_arg_list(node, *args):
    """Wrapper: returns a node with an argument_list."""
    result = sym.ARGLIST.make_node(node, *args)
    return result


def make_argument(expr, lineno: int, byref=None, name: str = None):
    """Wrapper: Creates a node containing an ARGUMENT"""
    if expr is None:
        return None  # There were a syntax / semantic error

    if byref is None:
        byref = OPTIONS.default_byref
    return sym.ARGUMENT(expr, lineno=lineno, byref=byref, name=name)


def make_param_list(node, *args):
    """Wrapper: Returns a param declaration list (function header)"""
    return sym.PARAMLIST.make_node(node, *args)


def make_sub_call(id_, lineno, arg_list):
    """This will return an AST node for a sub/procedure call."""
    return sym.CALL.make_node(id_, arg_list, lineno, gl.FILENAME)


def make_func_call(id_, lineno, arg_list):
    """This will return an AST node for a function call."""
    return sym.FUNCCALL.make_node(id_, arg_list, lineno, gl.FILENAME)


def make_array_access(id_, lineno, arglist):
    """Creates an array access. A(x1, x2, ..., xn).
    This is an RVALUE (Read the element)
    """
    for i, arg in enumerate(arglist):
        value = make_typecast(
            Type.by_name(src.api.constants.TYPE.to_string(gl.BOUND_TYPE)),
            arg.value,
            arg.lineno,
        )
        if value is None:  # semantic error?
            return None  # return error
        arg.value = value

    return sym.ARRAYACCESS.make_node(id_, arglist, lineno, gl.FILENAME)


def make_array_substr_assign(lineno: int, id_: str, arg_list, substr, expr_) -> sym.SENTENCE | None:
    if arg_list is None or substr is None or expr_ is None:
        return None  # There were errors

    entry = SYMBOL_TABLE.access_call(id_, lineno)
    if entry is None:
        return None  # There were errors

    if entry.type_ != Type.string:
        error(lineno, "Array '%s' is not of type String" % id_)
        return None  # There were errors

    arr = make_array_access(id_, lineno, arg_list)
    if arr is None:
        return None  # There were errors

    expr_ = make_typecast(arr.type_, expr_, lineno)
    if expr_ is None:
        return None  # There were errors

    str_idx_type = _TYPE(gl.STR_INDEX_TYPE)
    s0 = make_typecast(str_idx_type, substr[0], lineno)
    if s0 is None:
        return None  # There were errors

    s1 = make_typecast(str_idx_type, substr[1], lineno)
    if s1 is None:
        return None  # There were errors

    if OPTIONS.string_base:
        base = make_number(OPTIONS.string_base, lineno, _TYPE(gl.STR_INDEX_TYPE))
        s0 = make_binary(lineno, "MINUS", s0, base, func=lambda x, y: x - y)
        s1 = make_binary(lineno, "MINUS", s1, base, func=lambda x, y: x - y)

    return make_sentence(lineno, "LETARRAYSUBSTR", arr, s0, s1, expr_)


def make_call(id_: str, lineno: int, args: sym.ARGLIST):
    """This will return an AST node for a function call/array access.

    A "call" is just an ID followed by a list of arguments.
    E.g. a(4)
    - a(4) can be a function call if 'a' is a function
    - a(4) can be a string slice if 'a' is a string variable: a$(4)
    - a(4) can be an access to an array if 'a' is an array

    This function will inspect the id_. If it is undeclared, then
    id_ will be taken as a forwarded function.
    """
    if args is None:
        return None

    assert isinstance(args, sym.ARGLIST)

    entry = SYMBOL_TABLE.access_call(id_, lineno)
    if entry is None:
        return None

    if entry.class_ is CLASS.unknown and entry.type_ == Type.string and len(args) == 1 and is_numeric(args[0]):
        entry = entry.to_var()  # A scalar variable. e.g a$(expr)

    if entry.class_ == CLASS.array:  # An already declared array
        arr = sym.ARRAYLOAD.make_node(id_, args, lineno, gl.FILENAME)
        if arr is None:
            return None

        if arr.offset is not None:
            offset = make_typecast(Type.uinteger, make_number(arr.offset, lineno=lineno), lineno)
            arr.append_child(offset)
        return arr

    if entry.class_ in (CLASS.var, CLASS.const):  # An already declared/used string var
        if len(args) > 1:
            errmsg.syntax_error_not_array_nor_func(lineno, id_)
            return None

        if entry.class_ == CLASS.var:
            entry = SYMBOL_TABLE.access_var(id_, lineno)
            if entry is None:
                return None

        if len(args) == 1:
            if entry.class_ == CLASS.var:
                return make_strslice(lineno, entry, args[0].value, args[0].value)
            # it's a const
            return make_strslice(lineno, sym.STRING(entry.value, lineno), args[0].value, args[0].value)

        mark_entry_as_accessed(entry)
        return entry

    return make_func_call(id_, lineno, args)


def make_param_decl(
    id_: str,
    lineno: int,
    typedef: sym.TYPEREF,
    *,
    is_array: bool,
    default_value: sym.SYMBOL | None = None,
):
    """Wrapper that creates a param declaration"""
    return SYMBOL_TABLE.declare_param(id_, lineno, typedef, default_value, is_array=is_array)


def make_type(typename, lineno, implicit=False):
    """Converts a typename identifier (e.g. 'float') to
    its internal symbol table entry representation.

    Creates a type usage symbol stored in a AST
    E.g. DIM a As Integer
    will access Integer type
    """
    assert isinstance(typename, str)
    if not SYMBOL_TABLE.check_is_declared(typename, lineno, "type"):
        return None

    type_ = sym.TYPEREF(SYMBOL_TABLE.get_entry(typename), lineno, implicit=implicit)
    return type_


def make_bound(lower, upper, lineno):
    """Wrapper: Creates an array bound"""
    return sym.BOUND.make_node(lower, upper, lineno)


def make_bound_list(node, *args):
    """Wrapper: Creates an array BOUND LIST."""
    return sym.BOUNDLIST.make_node(node, *args)


def make_label(id_: str, lineno: int):
    """Creates a label entry. Returns None on error."""
    id_ = str(id_)  # Labels can be numbers and must be converted to strings
    entry = SYMBOL_TABLE.declare_label(id_, lineno)
    if entry:
        gl.DATA_LABELS[id_] = gl.DATA_PTR_CURRENT  # This label points to the current DATA block index
    return entry


def make_break(lineno: int, p):
    """Checks if --enable-break is set, and if so, calls
    BREAK keyboard interruption for this line if it has not been already
    checked"""
    global last_brk_linenum

    if not OPTIONS.enable_break or lineno == last_brk_linenum or is_null(p):
        return None

    last_brk_linenum = lineno
    return make_sentence(lineno, "CHKBREAK", make_number(lineno, lineno, Type.uinteger))


# ----------------------------------------------------------------------
# Operators precedence
# ----------------------------------------------------------------------
precedence = (
    ("nonassoc", "ID", "ARRAY_ID"),
    ("left", "OR"),
    ("left", "AND"),
    ("left", "XOR"),
    ("right", "NOT"),
    ("left", "LT", "GT", "EQ", "LE", "GE", "NE"),
    ("left", "BOR"),
    ("left", "BAND", "BXOR", "SHR", "SHL"),
    ("left", "BNOT", "PLUS", "MINUS"),
    ("left", "MOD"),
    ("left", "MUL", "DIV"),
    ("right", "UMINUS"),
    ("right", "POW"),
    ("left", "RP"),
    ("right", "LP"),
    ("right", "ELSE"),
    ("left", "CO"),
    ("left", "LABEL"),
    ("left", "NEWLINE"),
)


# ----------------------------------------------------------------------
# Grammar rules
# ----------------------------------------------------------------------


def p_start(p):
    """start : program"""
    global ast, data_ast

    make_label(gl.ZXBASIC_USER_DATA, 0)
    make_label(gl.ZXBASIC_USER_DATA_LEN, 0)

    if PRINT_IS_USED:
        OPTIONS.__DEFINES["___PRINT_IS_USED___"] = 1

    if zxblex.IN_STATE:
        p.type = "NEWLINE"
        p_error(p)
        sys.exit(1)

    ast = p[0] = p[1]
    __end = make_sentence(p.lexer.lineno, "END", make_number(0, lineno=p.lexer.lineno), sentinel=True)

    if not is_null(ast):
        if isinstance(ast, sym.BLOCK) and not is_ender(ast[-1]):
            ast.append_child(__end)
    else:
        ast = __end

    SYMBOL_TABLE.check_labels()
    SYMBOL_TABLE.check_classes()

    if gl.has_errors:
        return

    __DEBUG__("Checking pending labels", 1)
    if not src.api.check.check_pending_labels(ast):
        return

    __DEBUG__("Checking pending calls", 1)
    if not src.api.check.check_pending_calls():
        return

    data_ast = make_sentence(p.lexer.lineno, "BLOCK")

    # Appends variable declarations at the end.
    for var in SYMBOL_TABLE.vars_:
        data_ast.append_child(make_var_declaration(var))

    # Appends arrays declarations at the end.
    for var in SYMBOL_TABLE.arrays:
        data_ast.append_child(make_array_declaration(var))


def p_program_program_line(p):
    """program : program_line"""
    p[0] = make_block(p[1], make_break(p.lineno(1), p[1]))


def p_program(p):
    """program : program program_line"""
    p[0] = make_block(p[1], p[2], make_break(p.lineno(2), p[2]))


def p_program_line(p):
    """program_line : preproc_line NEWLINE
    | label_line NEWLINE
    | statements NEWLINE
    | statements_co NEWLINE
    | co_statements NEWLINE
    | co_statements_co NEWLINE
    | NEWLINE
    """
    p[0] = make_nop() if len(p) == 2 else p[1]


def p_co_statements_co(p):
    """co_statements_co : co_statements CO
    | co_statements_co CO
    | CO
    """
    p[0] = p[1] if len(p) == 3 else make_nop()


def p_co_statements(p):
    """co_statements : co_statements_co statement"""
    p[0] = make_block(p[1], p[2])


def p_statements_co(p):
    """statements_co : statements CO
    | statements_co CO
    """
    p[0] = p[1]


def p_statements_statement(p):
    """statements : statement
    | statements_co statement
    """
    if len(p) == 2:
        p[0] = make_block(p[1])
    else:
        p[0] = make_block(p[1], p[2])


def p_var_decls(p):
    """statement : var_decl"""
    p[0] = p[1]


def p_label(p):
    """label : LABEL"""
    p[0] = make_label(p[1], p.lineno(1))


def p_program_line_label(p):
    """label_line : label statements
    | label co_statements
    """
    lbl = p[1]
    p[0] = make_block(lbl, p[2]) if len(p) == 3 else lbl


def p_label_line_label_line_co(p):
    """label_line : label_line_co"""
    p[0] = p[1]


def p_label_line_co(p):
    """label_line_co : label statements_co %prec CO
    | label co_statements_co %prec CO
    | label %prec CO
    """
    lbl = p[1]
    p[0] = make_block(lbl, p[2]) if len(p) == 3 else lbl


def p_program_line_co(p):
    """program_co : program %prec CO
    | program label_line_co
    | program co_statements_co %prec CO
    | program statements_co %prec CO
    """
    p[0] = p[1] if len(p) == 2 else make_block(p[1], p[2])


def p_var_decl(p):
    """var_decl : DIM idlist typedef"""
    for vardata in p[2]:
        SYMBOL_TABLE.declare_variable(vardata[0], vardata[1], p[3])

    p[0] = None  # Variable declarations are made at the end of parsing


def p_var_decl_at(p):
    """var_decl : DIM idlist typedef AT expr"""
    p[0] = None

    if p[2] is None or p[3] is None or p[5] is None:
        return

    if len(p[2]) != 1:
        error(p.lineno(1), "Only one variable at a time can be declared this way")
        return

    idlist = p[2][0]

    entry = SYMBOL_TABLE.declare_variable(idlist[0], idlist[1], p[3])
    if entry is None:
        return

    if p[5].token == "CONSTEXPR":
        tmp = p[5].expr
        entry.addr = tmp
    elif not is_static(p[5]):
        errmsg.syntax_error_address_must_be_constant(p.lineno(4))
        return
    else:
        entry.addr = make_typecast(_TYPE(gl.PTR_TYPE), p[5], p.lineno(4))
        mark_entry_as_accessed(entry)
        if entry.scope == SCOPE.local:
            SYMBOL_TABLE.make_static(entry.name)


def p_var_decl_ini(p):
    """var_decl : DIM idlist typedef EQ expr
    | CONST idlist typedef EQ expr
    """
    p[0] = None

    keyword, idlist, typedef, expr = p[1], p[2], p[3], p[5]

    if len(idlist) != 1:
        error(p.lineno(1), "Initialized variables must be declared one by one.")
        return

    if expr is None:
        return

    if is_static(expr) and isinstance(expr, sym.UNARY):
        expr = make_constexpr(p.lineno(4), expr)  # Delayed constant evaluation

    if typedef.implicit:
        typedef = sym.TYPEREF(expr.type_, p.lexer.lineno, implicit=True)

    value = make_typecast(typedef.type_, expr, p.lineno(4))
    defval = value if is_static(expr) and value.type_ != Type.string else None

    if keyword == "DIM":
        SYMBOL_TABLE.declare_variable(idlist[0].name, idlist[0].lineno, typedef, default_value=defval)
    else:
        # keyword == "CONST"
        if defval is None:
            if not is_static_str(value):
                errmsg.syntax_error_not_constant(p.lineno(4))
                return
            defval = value

        SYMBOL_TABLE.declare_const(idlist[0].name, idlist[0].lineno, typedef, default_value=defval)

    if defval is None:  # Okay do a delayed initialization
        p[0] = make_sentence(
            p.lineno(1),
            "LET",
            SYMBOL_TABLE.access_var(idlist[0].name, p.lineno(1)),
            value,
        )


def p_singleid(p):
    """singleid : ID
    | ARRAY_ID
    """
    p[0] = Id(name=p[1], lineno=p.lineno(1))


def p_idlist_id(p):
    """idlist : singleid"""
    p[0] = [p[1]]


def p_idlist_idlist_id(p):
    """idlist : idlist COMMA singleid"""
    p[1].append(p[3])
    p[0] = p[1]


def p_arr_decl(p):
    """var_decl : var_arr_decl
    | var_arr_decl_addr
    """
    p[0] = None


def p_arr_decl_attr(p):
    """var_arr_decl_addr : var_arr_decl AT expr"""
    arr_decl, expr = p[1], p[3]
    if arr_decl is None or expr is None:
        p[0] = None
        return

    if expr.token == "CONSTEXPR":
        expr = expr.expr
        if expr.token == "UNARY" and expr.operator == "ADDRESS":  # Must be an ID
            if expr.operand.token == "ARRAYACCESS":
                if expr.operand.offset is None:
                    error(
                        p.lineno(4),
                        "Address is not constant. Only constant subscripts are allowed",
                    )
                    return
            else:
                if expr.operand.token not in ("ID", "VAR", "LABEL"):
                    error(p.lineno(3), "Only addresses of identifiers are allowed")
                    return
                expr.operand.has_address = True

    elif not is_static(expr):
        errmsg.syntax_error_address_must_be_constant(p.lineno(3))
        return

    arr_entry = SYMBOL_TABLE.access_array(arr_decl[0], arr_decl[1])
    arr_entry.addr = make_typecast(_TYPE(gl.PTR_TYPE), expr, p.lineno(2))
    if arr_entry.scope == SCOPE.local:
        SYMBOL_TABLE.make_static(arr_entry.name)

    p[0] = p[1]


def p_decl_arr(p):
    """var_arr_decl : DIM idlist LP bound_list RP typedef"""
    if len(p[2]) != 1:
        error(p.lineno(1), "Array declaration only allows one variable name at a time")
    else:
        id_, lineno = p[2][0]
        SYMBOL_TABLE.declare_array(id_, lineno, p[6], p[4])

    p[0] = p[2][0]


def p_arr_decl_initialized(p):
    """var_decl : DIM idlist LP bound_list RP typedef RIGHTARROW const_vector
    | DIM idlist LP bound_list RP typedef EQ const_vector
    """

    def check_bound(boundlist, remaining):
        """Checks if constant vector bounds matches the array one"""
        lineno = p.lineno(8)
        if not boundlist:  # Returns on empty list
            if not isinstance(remaining, list):
                return True  # It's OK :-)

            error(
                lineno,
                "Unexpected extra vector dimensions. It should be %i" % len(remaining),
            )
            return False

        if not isinstance(remaining, list):
            error(
                lineno,
                "Mismatched vector size. Missing %i extra dimension(s)" % len(boundlist),
            )
            return False

        if len(remaining) != boundlist[0].count:
            error(
                lineno,
                "Mismatched vector size. Expected %i elements, got %i." % (boundlist[0].count, len(remaining)),
            )
            return False  # It's wrong. :-(

        for row in remaining:
            if not check_bound(boundlist[1:], row):
                return False

        return True

    p[0] = None
    if p[4] is None or p[6] is None or p[8] is None:
        return

    if not check_bound(p[4].children, p[8]):
        return

    id_, lineno = p[2][0]
    SYMBOL_TABLE.declare_array(id_, lineno, p[6], p[4], default_value=p[8])

    entry = SYMBOL_TABLE.get_entry(id_)
    if entry is None:
        return

    if p[6] == Type.string or entry.type_ == Type.string:
        errmsg.syntax_error_cannot_initialize_array_of_type(p.lineno(1), Type.string)
        return


def p_bound_list(p):
    """bound_list : bound"""
    p[0] = make_bound_list(p[1])


def p_bound_list_bound(p):
    """bound_list : bound_list COMMA bound"""
    p[0] = make_bound_list(p[1], p[3])


def p_bound(p):
    """bound : expr"""
    p[0] = make_bound(make_number(OPTIONS.array_base, lineno=p.lineno(1)), p[1], p.lexer.lineno)


def p_bound_to_bound(p):
    """bound : expr TO expr"""
    p[0] = make_bound(p[1], p[3], p.lineno(2))


def p_const_vector(p):
    """const_vector : LBRACE const_vector_list RBRACE
    | LBRACE const_number_list RBRACE
    """
    p[0] = p[2]


def p_const_vector_elem_list(p):
    """const_number_list : expr"""
    if p[1] is None:
        return

    if not is_static(p[1]):
        if isinstance(p[1], sym.UNARY):
            tmp = make_constexpr(p.lineno(1), p[1])
        else:
            errmsg.syntax_error_not_constant(p.lexer.lineno)
            p[0] = None
            return
    else:
        tmp = p[1]

    p[0] = [tmp]


def p_const_vector_elem_list_list(p):
    """const_number_list : const_number_list COMMA expr"""
    if p[1] is None or p[3] is None:
        return

    if not is_static(p[3]):
        if isinstance(p[3], sym.UNARY):
            tmp = make_constexpr(p.lineno(2), p[3])
        else:
            errmsg.syntax_error_not_constant(p.lineno(2))
            p[0] = None
            return
    else:
        tmp = p[3]

    if p[1] is not None:
        p[1].append(tmp)
    p[0] = p[1]


def p_const_vector_list(p):
    """const_vector_list : const_vector"""
    p[0] = [p[1]]


def p_const_vector_vector_list(p):
    """const_vector_list : const_vector_list COMMA const_vector"""
    if len(p[3]) != len(p[1][0]):
        error(p.lineno(2), "All rows must have the same number of elements")
        p[0] = None
        return

    p[0] = p[1] + [p[3]]


def p_staement_func_decl(p):
    """statement : function_declaration"""
    p[0] = p[1]


def p_statement_border(p):
    """statement : BORDER expr"""
    p[0] = make_sentence(p.lineno(1), "BORDER", make_typecast(Type.ubyte, p[2], p.lineno(1)))


def p_statement_plot(p):
    """statement : PLOT expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "PLOT",
        make_typecast(Type.ubyte, p[2], p.lineno(3)),
        make_typecast(Type.ubyte, p[4], p.lineno(3)),
    )


def p_statement_plot_attr(p):
    """statement : PLOT attr_list expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "PLOT",
        make_typecast(Type.ubyte, p[3], p.lineno(4)),
        make_typecast(Type.ubyte, p[5], p.lineno(4)),
        p[2],
    )


def p_statement_draw3(p):
    """statement : DRAW expr COMMA expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "DRAW3",
        make_typecast(Type.integer, p[2], p.lineno(3)),
        make_typecast(Type.integer, p[4], p.lineno(5)),
        make_typecast(Type.float_, p[6], p.lineno(5)),
    )


def p_statement_draw3_attr(p):
    """statement : DRAW attr_list expr COMMA expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "DRAW3",
        make_typecast(Type.integer, p[3], p.lineno(4)),
        make_typecast(Type.integer, p[5], p.lineno(6)),
        make_typecast(Type.float_, p[7], p.lineno(6)),
        p[2],
    )


def p_statement_draw(p):
    """statement : DRAW expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "DRAW",
        make_typecast(Type.integer, p[2], p.lineno(3)),
        make_typecast(Type.integer, p[4], p.lineno(3)),
    )


def p_statement_draw_attr(p):
    """statement : DRAW attr_list expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "DRAW",
        make_typecast(Type.integer, p[3], p.lineno(4)),
        make_typecast(Type.integer, p[5], p.lineno(4)),
        p[2],
    )


def p_statement_circle(p):
    """statement : CIRCLE expr COMMA expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "CIRCLE",
        make_typecast(Type.byte_, p[2], p.lineno(3)),
        make_typecast(Type.byte_, p[4], p.lineno(5)),
        make_typecast(Type.byte_, p[6], p.lineno(5)),
    )


def p_statement_circle_attr(p):
    """statement : CIRCLE attr_list expr COMMA expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "CIRCLE",
        make_typecast(Type.byte_, p[3], p.lineno(4)),
        make_typecast(Type.byte_, p[5], p.lineno(6)),
        make_typecast(Type.byte_, p[7], p.lineno(6)),
        p[2],
    )


def p_statement_cls(p):
    """statement : CLS"""
    p[0] = make_sentence(p.lineno(1), "CLS")


def p_statement_asm(p):
    """statement : ASM"""
    p[0] = make_asm_sentence(p[1], p.lineno(1))


def p_statement_randomize(p):
    """statement : RANDOMIZE"""
    p[0] = make_sentence(p.lineno(1), "RANDOMIZE", make_number(0, lineno=p.lineno(1), type_=Type.ulong))


def p_statement_randomize_expr(p):
    """statement : RANDOMIZE expr"""
    p[0] = make_sentence(p.lineno(1), "RANDOMIZE", make_typecast(Type.ulong, p[2], p.lineno(1)))


def p_statement_beep(p):
    """statement : BEEP expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "BEEP",
        make_typecast(Type.float_, p[2], p.lineno(1)),
        make_typecast(Type.float_, p[4], p.lineno(3)),
    )


def p_statement_call(p):
    """statement : ID arg_list
    | ID arguments
    | ID
    """
    if len(p) > 2 and p[2] is None:
        p[0] = None
    elif len(p) == 2:
        entry = SYMBOL_TABLE.get_entry(p[1])
        if entry is not None and entry.class_ in (CLASS.label, CLASS.unknown):
            p[0] = make_label(p[1], p.lineno(1))
        else:
            p[0] = make_sub_call(p[1], p.lineno(1), make_arg_list(None))
    else:
        p[0] = make_sub_call(p[1], p.lineno(1), p[2])


def p_assignment(p):
    """statement : lexpr expr"""
    global LET_ASSIGNMENT

    LET_ASSIGNMENT = False  # Mark we're no longer using LET
    p[0] = None
    q = p[1:]
    i = 1

    if q[1] is None:
        return

    if q[1].token == "VAR" and q[1].class_ == CLASS.unknown:
        q[1] = SYMBOL_TABLE.access_var(q[1].name, p.lineno(i))

    q1class_ = q[1].class_ if q[1].token == "VAR" else CLASS.unknown
    variable = SYMBOL_TABLE.access_id(q[0], p.lineno(i), default_type=q[1].type_, default_class=q1class_)
    if variable is None:
        return  # HINT: This only happens if variable was not declared with DIM and --strict flag is in use

    if variable.class_ == CLASS.unknown:  # The variable is implicit
        variable = variable.to_var()

    if variable.class_ not in (CLASS.var, CLASS.array):
        errmsg.syntax_error_cannot_assign_not_a_var(p.lineno(i), variable.name)
        return

    if variable.class_ == CLASS.var and q1class_ == CLASS.array:
        error(p.lineno(i), "Cannot assign an array to an scalar variable")
        return

    expr = make_typecast(variable.type_, q[1], p.lineno(i))
    p[0] = make_sentence(p.lineno(1), "LET", variable, expr)


def p_lexpr(p):
    """lexpr : ID EQ
    | LET ID EQ
    """
    global LET_ASSIGNMENT

    LET_ASSIGNMENT = True  # Mark we're about to start a LET sentence

    if p[1] == "LET":
        p[0] = p[2]
        i = 2
    else:
        p[0] = p[1]
        i = 1

    SYMBOL_TABLE.access_id(p[i], p.lineno(i))


def p_array_copy(p):
    """statement : ARRAY_ID EQ ARRAY_ID
    | LET ARRAY_ID EQ ARRAY_ID
    """
    if p[1] == "LET":
        array_id1, array_id2 = p[2], p[4]
        l1, l2 = p.lineno(2), p.lineno(4)
    else:
        array_id1, array_id2 = p[1], p[3]
        l1, l2 = p.lineno(1), p.lineno(3)

    larray = SYMBOL_TABLE.access_id(array_id1, l1)
    rarray = SYMBOL_TABLE.access_id(array_id2, l2)

    if larray is None or rarray is None:
        p[0] = None
        return

    if larray.type_ != rarray.type_:
        error(l1, "Arrays must have the same element type")
        return

    if larray.ref.memsize != rarray.ref.memsize:
        error(l1, "Arrays '%s' and '%s' must have the same size" % (array_id1, array_id2))
        return

    if larray.ref.count != rarray.ref.count:
        warning(
            l1,
            "Arrays '%s' and '%s' don't have the same number of dimensions" % (larray.name, rarray.name),
        )
    else:
        for b1, b2 in zip(larray.ref.bounds, rarray.ref.bounds):
            if b1.count != b2.count:
                warning(
                    l1,
                    "Arrays '%s' and '%s' don't have the same dimensions" % (array_id1, array_id2),
                )
                break
    # Array copy
    mark_entry_as_accessed(larray)
    mark_entry_as_accessed(rarray)
    p[0] = make_sentence(p.lineno(1), "ARRAYCOPY", larray, rarray)


def p_arr_assignment(p):
    """statement : ARRAY_ID arg_list EQ expr
    | LET ARRAY_ID arg_list EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1
    id_ = p[i]
    arg_list = p[i + 1]
    expr = p[i + 3]

    p[0] = None
    if arg_list is None or expr is None:
        return  # There were errors

    entry = SYMBOL_TABLE.access_call(id_, p.lineno(i))
    if entry is None:
        return

    if entry.type_ == Type.string:
        variable = gl.SYMBOL_TABLE.access_array(id_, p.lineno(i))
        # variable is an array. If it has 0 bounds means they are undefined (param byref)
        if len(variable.ref.bounds) and len(variable.ref.bounds) + 1 == len(arg_list):
            ss = arg_list.children.pop().value
            p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, (ss, ss), expr)
            return

    arr = make_array_access(id_, p.lineno(i), arg_list)
    if arr is None:
        return

    expr = make_typecast(arr.type_, expr, p.lineno(i))
    if entry is None:
        return

    if entry.addr is not None:  # has addr?
        mark_entry_as_accessed(entry)

    p[0] = make_sentence(p.lineno(1), "LETARRAY", arr, expr)


def p_substr_assignment_no_let(p):
    """statement : ID LP expr RP EQ expr"""
    # This can be only a substr assignment like a$(i + 3) = ".", since arrays
    # have ARRAY_ID already
    entry = SYMBOL_TABLE.access_call(p[1], p.lineno(1))
    if entry is None:
        return

    if entry.class_ == CLASS.unknown:
        entry.class_ = CLASS.var

    if p[6].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(5), p[6].type_)

    lineno = p.lineno(2)
    base = make_number(OPTIONS.string_base, lineno, _TYPE(gl.STR_INDEX_TYPE))
    substr = make_typecast(_TYPE(gl.STR_INDEX_TYPE), p[3], lineno)
    p[0] = make_sentence(
        p.lineno(1),
        "LETSUBSTR",
        entry,
        make_binary(lineno, "MINUS", substr, base, func=lambda x, y: x - y),
        make_binary(lineno, "MINUS", substr, base, func=lambda x, y: x - y),
        p[6],
    )


def p_substr_assignment(p):
    """statement : LET ID arg_list EQ expr"""
    if p[3] is None or p[5] is None:
        return  # There were errors

    p[0] = None
    entry = SYMBOL_TABLE.access_call(p[2], p.lineno(2))
    if entry is None:
        return

    if entry.class_ == CLASS.unknown:
        entry = entry.to_var()

    if entry.class_ != CLASS.var:
        errmsg.syntax_error_cannot_assign_not_a_var(p.lineno(2), p[2])
        return

    if entry.type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(2), entry.type_)
        return

    if p[5].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(4), p[5].type_)
        return

    if len(p[3]) > 1:
        error(p.lineno(2), "Accessing string with too many indexes. Expected only one.")
        return

    if len(p[3]) == 1:
        substr = (
            make_typecast(_TYPE(gl.STR_INDEX_TYPE), p[3][0].value, p.lineno(2)),
            make_typecast(_TYPE(gl.STR_INDEX_TYPE), p[3][0].value, p.lineno(2)),
        )
    else:
        substr = (
            make_typecast(
                _TYPE(gl.STR_INDEX_TYPE),
                make_number(gl.MIN_STRSLICE_IDX, lineno=p.lineno(2)),
                p.lineno(2),
            ),
            make_typecast(
                _TYPE(gl.STR_INDEX_TYPE),
                make_number(gl.MAX_STRSLICE_IDX, lineno=p.lineno(2)),
                p.lineno(2),
            ),
        )

    lineno = p.lineno(2)
    base = make_number(OPTIONS.string_base, lineno, _TYPE(gl.STR_INDEX_TYPE))
    p[0] = make_sentence(
        p.lineno(1),
        "LETSUBSTR",
        entry,
        make_binary(lineno, "MINUS", substr[0], base, func=lambda x, y: x - y),
        make_binary(lineno, "MINUS", substr[1], base, func=lambda x, y: x - y),
        p[5],
    )


def p_str_assign(p):
    """statement : ID substr EQ expr
    | LET ID substr EQ expr
    """
    if p[1].upper() != "LET":
        q = p[1]
        r = p[4]
        s = p[2]
        lineno = p.lineno(3)
    else:
        q = p[2]
        r = p[5]
        s = p[3]
        lineno = p.lineno(4)

    if q is None or s is None:
        p[0] = None
        return

    if r.type_ != Type.string:
        errmsg.syntax_error_expected_string(lineno, r.type_)

    entry = SYMBOL_TABLE.access_var(q, lineno, default_type=Type.string)
    if entry is None:
        p[0] = None
        return

    p[0] = make_sentence(p.lineno(1), "LETSUBSTR", entry, s[0], s[1], r)


def p_goto(p):
    """statement : goto NUMBER
    | goto ID
    """
    entry = check_and_make_label(p[2], p.lineno(2))
    if entry is not None:
        p[0] = make_sentence(p.lineno(1), p[1].upper(), entry)
    else:
        p[0] = None


def p_go(p):
    """goto : GO TO
    | GO SUB
    | GOTO
    | GOSUB
    """
    p[0] = p[1]
    if p[0] == "GO":
        p[0] += p[2]

    if p[0] == "GOSUB" and FUNCTION_LEVEL:  # GOSUB not in global scope?
        error(p.lineno(1), "GOSUB not allowed within SUB or FUNCTION")


# region [IF sentence]
def p_if_sentence(p):
    """statement : if_then_part NEWLINE program_co endif
    | if_then_part NEWLINE endif
    | if_then_part NEWLINE statements_co endif
    | if_then_part NEWLINE co_statements_co endif
    | if_then_part NEWLINE label statements_co endif
    """
    cond_ = p[1]
    if len(p) == 6:
        lbl = p[3]
        stat_ = make_block(lbl, p[4])
        endif_ = p[5]
    elif len(p) == 5:
        stat_ = p[3]
        endif_ = p[4]
    else:
        stat_ = make_nop()
        endif_ = p[3]

    p[0] = make_sentence(p.lineno(2), "IF", cond_, make_block(stat_, endif_))


def p_endif(p):
    """endif : END IF
    | label END IF
    | ENDIF
    | label ENDIF
    """
    p[0] = make_nop() if p[1] in ("END", "ENDIF") else p[1]


def p_statement_if(p):
    """statement : if_inline %prec RP"""
    p[0] = p[1]


def p_statement_if_then_endif(p):
    """statement : if_then_part statements_co endif
    | if_then_part co_statements_co endif
    """
    cond_ = p[1]
    stat_ = p[2]
    endif_ = p[3]
    p[0] = make_sentence(p.lineno(1), "IF", cond_, make_block(stat_, endif_))


def p_single_line_if(p):
    """if_inline : if_then_part statements %prec ID
    | if_then_part co_statements_co %prec NEWLINE
    | if_then_part statements_co %prec NEWLINE
    | if_then_part co_statements %prec ID
    """
    cond_ = p[1]
    stat_ = p[2]
    p[0] = make_sentence(p.lineno(1), "IF", cond_, stat_)


def p_if_elseif(p):
    """statement : if_then_part NEWLINE program_co elseiflist
    | if_then_part NEWLINE elseiflist
    """
    cond_ = p[1]
    stats_ = p[3] if len(p) == 5 else make_nop()
    eliflist = p[4] if len(p) == 5 else p[3]
    p[0] = make_sentence(p.lineno(2), "IF", cond_, stats_, eliflist)


def p_elseif_part(p):
    """elseif_expr : ELSEIF expr then
    | label ELSEIF expr then
    """
    if p[1] == "ELSEIF":
        label_ = make_nop()  # No label
        cond_ = p[2]
    else:
        label_ = p[1]
        cond_ = p[3]

    p[0] = label_, cond_


def p_elseif_list(p):
    """elseiflist : elseif_expr program_co endif
    | elseif_expr program_co else_part
    """
    label_, cond_ = p[1]
    then_ = p[2]
    else_ = p[3]

    if isinstance(else_, list):  # it's an else part
        else_ = make_block(*else_)
    else:
        then_ = make_block(then_, else_)
        else_ = None

    p[0] = make_block(label_, make_sentence(p.lineno(1), "IF", cond_, then_, else_))


def p_elseif_elseiflist(p):
    """elseiflist : elseif_expr program_co elseiflist"""
    label_, cond_ = p[1]
    then_ = p[2]
    else_ = p[3]
    p[0] = make_block(label_, make_sentence(p.lineno(1), "IF", cond_, then_, else_))


def p_else_part_endif(p):
    """else_part_inline : ELSE NEWLINE program_co endif
    | ELSE NEWLINE statements_co endif
    | ELSE NEWLINE co_statements_co endif
    | ELSE NEWLINE endif
    | ELSE NEWLINE label statements_co endif
    | ELSE NEWLINE label co_statements_co endif
    | ELSE statements_co endif
    | ELSE co_statements_co endif
    """
    if p[2] == "\n":
        if len(p) == 4:
            p[0] = [make_nop(), p[3]]
        elif len(p) == 6:
            p[0] = [p[3], p[4], p[5]]
        else:
            p[0] = [p[3], p[4]]
    else:
        p[0] = [p[2], p[3]]


def p_else_part(p):
    """else_part_inline : ELSE statements_co
    | ELSE co_statements_co
    | ELSE co_statements
    | ELSE statements
    """
    p[0] = [p[2], make_nop()]


def p_else_part_is_inline(p):
    """else_part : else_part_inline"""
    p[0] = p[1]


def p_else_part_label(p):
    """else_part : label ELSE program_co endif
    | label ELSE statements_co endif
    | label ELSE co_statements_co endif
    """
    lbl = p[1]
    p[0] = [make_block(lbl, p[3]), p[4]]


def p_if_then_part(p):
    """if_then_part : IF expr then"""
    expr = p[2]
    if expr is None:
        p[0] = None
        return

    if is_number(expr):
        errmsg.warning_condition_is_always(p.lineno(1), bool(expr.value))

    p[0] = expr


def p_if_inline(p):
    """statement : if_inline else_part_inline"""
    p[1].append_child(make_block(p[2][0], p[2][1]))
    p[0] = p[1]


def p_if_else(p):
    """statement : if_then_part NEWLINE program_co else_part"""
    cond_ = p[1]
    then_ = p[3]
    else_ = p[4][0]
    endif = p[4][1]
    p[0] = make_sentence(p.lineno(2), "IF", cond_, then_, make_block(else_, endif))


def p_then(p):
    """then :
    | THEN
    """


# endregion


# region [FOR sentence]
def p_for_sentence(p):
    """statement : for_start program_co label_next
    | for_start co_statements_co label_next
    | for_start program label_next
    """
    p[0] = p[1]
    if is_null(p[0]):
        return
    p[1].append_child(make_block(p[2], p[3]))
    gl.LOOPS.pop()


def p_next(p):
    """label_next : label NEXT
    | NEXT
    """
    p[0] = make_nop() if p[1] == "NEXT" else p[1]


def p_next1(p):
    """label_next : label NEXT ID
    | NEXT ID
    """
    if p[1] == "NEXT":
        p1 = make_nop()
        p3 = p[2]
    else:
        p1 = p[1]
        p3 = p[3]

    if p3 != gl.LOOPS[-1].var:
        errmsg.syntax_error_wrong_for_var(p.lineno(2), gl.LOOPS[-1].var, p3)
        p[0] = make_nop()
        return

    p[0] = p1


def p_for_sentence_start(p):
    """for_start : FOR ID EQ expr TO expr step"""
    gl.LOOPS.append(LoopInfo(type=LoopType.FOR, lineno=p.lineno(1), var=p[2]))
    p[0] = None

    if p[4] is None or p[6] is None or p[7] is None:
        return

    if is_number(p[4], p[6], p[7]):
        if p[4].value != p[6].value and p[7].value == 0:
            warning(p.lineno(5), "STEP value is 0 and FOR might loop forever")

        if p[4].value > p[6].value and p[7].value > 0:
            warning(
                p.lineno(5),
                "FOR start value is greater than end. This FOR loop is useless",
            )

        if p[4].value < p[6].value and p[7].value < 0:
            warning(
                p.lineno(2),
                "FOR start value is lower than end. This FOR loop is useless",
            )

    id_type = common_type(common_type(p[4].type_, p[6].type_), p[7].type_)
    variable = SYMBOL_TABLE.access_var(p[2], p.lineno(2), default_type=id_type)
    if variable is None:
        return

    mark_entry_as_accessed(variable)
    expr1 = make_typecast(variable.type_, p[4], p.lineno(3))
    expr2 = make_typecast(variable.type_, p[6], p.lineno(5))
    expr3 = make_typecast(variable.type_, p[7], p.lexer.lineno)

    p[0] = make_sentence(p.lineno(1), "FOR", variable, expr1, expr2, expr3)


def p_step(p):
    """step :"""
    p[0] = make_number(1, lineno=p.lexer.lineno)


def p_step_expr(p):
    """step : STEP expr"""
    p[0] = p[2]


# endregion


def p_end(p):
    """statement : END expr
    | END
    """
    q = make_number(0, lineno=p.lineno(1)) if len(p) == 2 else p[2]
    p[0] = make_sentence(p.lineno(1), "END", q)


def p_error_raise(p):
    """statement : ERROR expr"""
    q = make_number(1, lineno=p.lineno(2))
    r = make_binary(
        p.lineno(1),
        "MINUS",
        make_typecast(Type.ubyte, p[2], p.lineno(1)),
        q,
        lambda x, y: x - y,
    )
    p[0] = make_sentence(p.lineno(1), "ERROR", r)


def p_stop_raise(p):
    """statement : STOP expr
    | STOP
    """
    q = make_number(9, lineno=p.lineno(1)) if len(p) == 2 else p[2]
    z = make_number(1, lineno=p.lineno(1))
    r = make_binary(
        p.lineno(1),
        "MINUS",
        make_typecast(Type.ubyte, q, p.lineno(1)),
        z,
        lambda x, y: x - y,
    )
    p[0] = make_sentence(p.lineno(1), "STOP", r)


def p_loop(p):
    """label_loop : label LOOP
    | LOOP
    """
    if p[1] == "LOOP":
        p[0] = None
    else:
        p[0] = p[1]


def p_do_loop(p):
    """statement : do_start program_co label_loop
    | do_start label_loop
    | DO label_loop
    """
    if len(p) == 4:
        q = make_block(p[2], p[3])
    else:
        q = p[2]

    if p[1] == "DO":
        gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))

    if q is None:
        warning(p.lineno(1), "Infinite empty loop")

    # An infinite loop and no warnings
    p[0] = make_sentence(p.lineno(1), "DO_LOOP", q)
    gl.LOOPS.pop()


def p_do_loop_until(p):
    """statement : do_start program_co label_loop UNTIL expr
    | do_start label_loop UNTIL expr
    | DO label_loop UNTIL expr
    """
    if len(p) == 6:
        q = make_block(p[2], p[3])
        r = p[5]
    else:
        q = p[2]
        r = p[4]

    if p[1] == "DO":
        gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))

    p[0] = make_sentence(p.lineno(1), "DO_UNTIL", r, q)

    gl.LOOPS.pop()
    if is_number(r):
        errmsg.warning_condition_is_always(p.lineno(3), bool(r.value))
    if q is None:
        errmsg.warning_empty_loop(p.lineno(3))


def p_data(p):
    """statement : DATA arguments"""
    label_ = make_label(gl.DATA_PTR_CURRENT, lineno=p.lineno(1))
    datas_ = []
    funcs = []

    if p[2] is None:
        p[0] = None
        return

    if gl.FUNCTION_LEVEL:
        errmsg.error(p.lineno(1), "DATA not allowed within Functions nor Subs")
        p[0] = None
        return

    for d in p[2].children:
        value = d.value
        if is_static(value):
            datas_.append(d)
            continue

        new_lbl = f"__DATA__FUNCPTR__{len(gl.DATA_FUNCTIONS)}"
        type_ = value.type_
        assert isinstance(type_, sym.TYPING)
        if isinstance(type_, sym.TYPE):
            type_ = sym.TYPEREF(value.type_, 0)

        entry = make_func_declaration(new_lbl, p.lineno(1), type_=type_, class_=CLASS.function)
        if not entry:
            continue

        func = entry.entry
        func.ref.convention = CONVENTION.fastcall
        SYMBOL_TABLE.enter_scope(new_lbl)
        func.ref.local_symbol_table = SYMBOL_TABLE.current_scope
        func.ref.locals_size = SYMBOL_TABLE.leave_scope()

        gl.DATA_FUNCTIONS.append(func)
        sent = make_sentence(p.lineno(1), "RETURN", func, value)
        func.ref.body = make_block(sent)
        datas_.append(entry)
        funcs.append(entry)

    gl.DATAS.append(src.api.dataref.DataRef(label_, datas_))
    id_ = src.api.utils.current_data_label()
    gl.DATA_PTR_CURRENT = id_


def p_restore(p):
    """statement : RESTORE
    | RESTORE ID
    | RESTORE NUMBER
    """
    if len(p) == 2:
        lbl = None
    else:
        lbl = check_and_make_label(p[2], p.lineno(1))

    p[0] = make_sentence(p.lineno(1), "RESTORE", lbl)


def p_read(p):
    """statement : READ arguments"""
    gl.DATA_IS_USED = True
    reads = []

    if p[2] is None:
        return

    for arg in p[2]:
        entry = arg.value
        if entry is None:
            p[0] = None
            return

        if entry.token == "VARARRAY":
            errmsg.error(p.lineno(1), "Cannot read '%s'. It's an array" % entry.name)
            p[0] = None
            return

        if isinstance(entry, sym.ID):
            if entry.class_ != CLASS.var:
                errmsg.syntax_error_cannot_assign_not_a_var(p.lineno(2), entry.name)
                p[0] = None
                return

            mark_entry_as_accessed(entry)
            if entry.type_ == Type.auto:
                entry.type_ = _TYPE(gl.DEFAULT_TYPE)
                errmsg.warning_implicit_type(p.lineno(2), p[2], entry.type_.name)

            reads.append(make_sentence(p.lineno(1), "READ", entry))
            continue

        if isinstance(entry, sym.ARRAYLOAD):
            reads.append(
                make_sentence(
                    p.lineno(1),
                    "READ",
                    sym.ARRAYACCESS(entry.entry, entry.args, entry.lineno, gl.FILENAME),
                )
            )
            continue

        errmsg.error(p.lineno(1), "Syntax error. Can only read a variable or an array element")
        p[0] = None
        return

    p[0] = make_block(*reads)


def p_do_loop_while(p):
    """statement : do_start program_co label_loop WHILE expr
    | do_start label_loop WHILE expr
    | DO label_loop WHILE expr
    """
    if len(p) == 6:
        q = make_block(p[2], p[3])
        r = p[5]
    else:
        q = p[2]
        r = p[4]

    if p[1] == "DO":
        gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))

    p[0] = make_sentence(p.lineno(1), "DO_WHILE", r, q)
    gl.LOOPS.pop()

    if is_number(r):
        errmsg.warning_condition_is_always(p.lineno(3), bool(r.value))
    if q is None:
        errmsg.warning_empty_loop(p.lineno(3))


def p_do_while_loop(p):
    """statement : do_while_start program_co LOOP
    | do_while_start co_statements_co LOOP
    | do_while_start LOOP
    """
    r = p[1]
    q = p[2]
    if q == "LOOP":
        q = None

    p[0] = make_sentence(p.lineno(1), "WHILE_DO", r, q)
    gl.LOOPS.pop()

    if is_number(r):
        errmsg.warning_condition_is_always(p.lineno(2), bool(r.value))


def p_do_until_loop(p):
    """statement : do_until_start program_co LOOP
    | do_until_start co_statements_co LOOP
    | do_until_start LOOP
    """
    r = p[1]
    q = p[2]
    if q == "LOOP":
        q = None

    p[0] = make_sentence(p.lineno(2), "UNTIL_DO", r, q)
    gl.LOOPS.pop()

    if is_number(r):
        errmsg.warning_condition_is_always(p.lineno(2), bool(r.value))


def p_do_while_start(p):
    """do_while_start : DO WHILE expr"""
    p[0] = p[3]
    gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))


def p_do_until_start(p):
    """do_until_start : DO UNTIL expr"""
    p[0] = p[3]
    gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))


def p_do_start(p):
    """do_start : DO CO
    | DO NEWLINE
    """
    gl.LOOPS.append(LoopInfo(LoopType.DO, p.lineno(1)))


def p_label_end_while(p):
    """label_end_while : label WEND
    | label END WHILE
    | WEND
    | END WHILE
    """
    if p[1] in ("WEND", "END"):
        p[0] = None
    else:
        p[0] = p[1]


def p_while_sentence(p):
    """statement : while_start co_statements_co label_end_while
    | while_start program_co label_end_while
    """
    gl.LOOPS.pop()
    q = make_block(p[2], p[3])

    if is_number(p[1]):
        errmsg.warning_condition_is_always(p.lineno(1), bool(p[1].value))

    p[0] = make_sentence(p.lineno(1), "WHILE", p[1], q)


def p_while_start(p):
    """while_start : WHILE expr"""
    p[0] = p[2]
    gl.LOOPS.append(LoopInfo(LoopType.WHILE, p.lineno(1)))
    if is_number(p[2]) and not p[2].value:
        errmsg.warning_condition_is_always(p.lineno(1))


def p_exit(p):
    """statement : EXIT WHILE
    | EXIT DO
    | EXIT FOR
    """
    q = p[2]
    p[0] = make_sentence(p.lineno(1), "EXIT_%s" % q)

    for loop in gl.LOOPS:
        if q == loop.type:
            return

    error(p.lineno(1), "Syntax Error: EXIT %s out of loop" % q)


def p_continue(p):
    """statement : CONTINUE WHILE
    | CONTINUE DO
    | CONTINUE FOR
    """
    q = p[2]
    p[0] = make_sentence(p.lineno(1), "CONTINUE_%s" % q)

    for i in gl.LOOPS:
        if q == i[0]:
            return

    error(p.lineno(1), "Syntax Error: CONTINUE %s out of loop" % q)


def p_print_sentence(p):
    """statement : PRINT print_list"""
    global PRINT_IS_USED

    p[0] = p[2]
    PRINT_IS_USED = True


def p_print_elem_expr(p):
    """print_elem : expr"""
    p[0] = p[1]
    if p[1] is not None and p[1].type_ == Type.boolean:
        p[0] = make_typecast(Type.ubyte, p[1], p.lineno(1))


def p_print_list_expr(p):
    """print_elem : print_at
    | print_tab
    | attr
    | BOLD expr
    | ITALIC expr
    """
    if p[1] in ("BOLD", "ITALIC"):
        p[0] = make_sentence(p.lineno(1), p[1] + "_TMP", make_typecast(Type.ubyte, p[2], p.lineno(1)))
    else:
        p[0] = p[1]


def p_attr_list(p):
    """attr_list : attr SC"""
    p[0] = p[1]


def p_attr_list_list(p):
    """attr_list : attr_list attr SC"""
    p[0] = make_block(p[1], p[2])


def p_attr(p):
    """attr : OVER expr
    | INVERSE expr
    | INK expr
    | PAPER expr
    | BRIGHT expr
    | FLASH expr
    """
    # ATTR_LIST are used by drawing commands: PLOT, DRAW, CIRCLE
    # BOLD and ITALIC are ignored by them, so we put them out of the
    # attr definition so something like DRAW BOLD 1; .... will raise
    # a syntax error
    p[0] = make_sentence(p.lineno(1), p[1] + "_TMP", make_typecast(Type.ubyte, p[2], p.lineno(1)))


def p_print_list_epsilon(p):
    """print_elem :"""
    p[0] = None


def p_print_list_elem(p):
    """print_list : print_elem"""
    p[0] = make_sentence(p.lexer.lineno, "PRINT", p[1])
    p[0].eol = True


def p_print_list(p):
    """print_list : print_list SC print_elem"""
    p[0] = p[1]
    p[0].eol = p[3] is not None

    if p[3] is not None:
        p[0].append_child(p[3])


def p_print_list_comma(p):
    """print_list : print_list COMMA print_elem"""
    p[0] = p[1]
    p[0].eol = p[3] is not None
    p[0].append_child(make_sentence(p.lineno(2), "PRINT_COMMA"))

    if p[3] is not None:
        p[0].append_child(p[3])


def p_print_list_at(p):
    """print_at : AT expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "PRINT_AT",
        make_typecast(Type.ubyte, p[2], p.lineno(1)),
        make_typecast(Type.ubyte, p[4], p.lineno(3)),
    )


def p_print_list_tab(p):
    """print_tab : TAB expr"""
    p[0] = make_sentence(p.lineno(1), "PRINT_TAB", make_typecast(Type.ubyte, p[2], p.lineno(1)))


def p_on_goto(p):
    """statement : ON expr goto label_list"""
    expr = make_typecast(Type.ubyte, p[2], p.lineno(1))
    p[0] = make_sentence(p.lineno(1), "ON_" + p[3], expr, *p[4])


def p_label_list(p):
    """label_list : ID
    | NUMBER
    """
    entry = check_and_make_label(p[1], p.lineno(1))
    p[0] = [entry]


def p_label_list_list(p):
    """label_list : label_list COMMA ID
    | label_list COMMA NUMBER
    """
    p[0] = p[1]
    entry = check_and_make_label(p[3], p.lineno(3))
    p[1].append(entry)


def p_return(p):
    """statement : RETURN"""
    if not FUNCTION_LEVEL:  # At less one level, otherwise, this return is from a GOSUB
        p[0] = make_sentence(p.lineno(1), "RETURN")
        return

    if FUNCTION_LEVEL[-1].class_ != CLASS.sub:
        error(p.lineno(1), "Syntax Error: Function must RETURN a value.")
        p[0] = None
        return

    p[0] = make_sentence(p.lineno(1), "RETURN", FUNCTION_LEVEL[-1])


def p_return_expr(p):
    """statement : RETURN expr"""
    if not FUNCTION_LEVEL:  # At less one level
        error(p.lineno(1), "Syntax Error: Returning value out of FUNCTION")
        p[0] = None
        return

    if FUNCTION_LEVEL[-1].class_ is CLASS.unknown:  # This function was not correctly declared.
        p[0] = None
        return

    if FUNCTION_LEVEL[-1].class_ != CLASS.function:
        error(p.lineno(1), "Syntax Error: SUBs cannot return a value")
        p[0] = None
        return

    if FUNCTION_LEVEL[-1].type_ is None:  # There was an error in the Function declaration
        p[0] = None
        return

    if is_numeric(p[2]) and FUNCTION_LEVEL[-1].type_.final == Type.string:
        error(
            p.lineno(2),
            "Type Error: Function must return a string, not a numeric value",
        )
        p[0] = None
        return

    if not is_numeric(p[2]) and FUNCTION_LEVEL[-1].type_.final != Type.string:
        error(
            p.lineno(2),
            "Type Error: Function must return a numeric value, not a string",
        )
        p[0] = None
        return

    p[0] = make_sentence(
        p.lineno(1),
        "RETURN",
        FUNCTION_LEVEL[-1],
        make_typecast(FUNCTION_LEVEL[-1].type_, p[2], p.lineno(1)),
    )


def p_pause(p):
    """statement : PAUSE expr"""
    p[0] = make_sentence(p.lineno(1), "PAUSE", make_typecast(Type.uinteger, p[2], p.lineno(1)))


def p_poke(p):
    """statement : POKE expr COMMA expr
    | POKE LP expr COMMA expr RP
    """
    i = 2 if isinstance(p[2], Symbol) or p[2] is None else 3
    if p[i] is None or p[i + 2] is None:
        p[0] = None
        return
    p[0] = make_sentence(
        p.lineno(1),
        "POKE",
        make_typecast(Type.uinteger, p[i], p.lineno(i + 1)),
        make_typecast(Type.ubyte, p[i + 2], p.lineno(i + 1)),
    )


def p_poke2(p):
    """statement : POKE numbertype expr COMMA expr
    | POKE LP numbertype expr COMMA expr RP
    """
    i = 2 if isinstance(p[2], Symbol) or p[2] is None else 3
    if p[i + 1] is None or p[i + 3] is None:
        p[0] = None
        return
    p[0] = make_sentence(
        p.lineno(1),
        "POKE",
        make_typecast(Type.uinteger, p[i + 1], p.lineno(i + 2)),
        make_typecast(p[i], p[i + 3], p.lineno(i + 3)),
    )


def p_poke3(p):
    """statement : POKE numbertype COMMA expr COMMA expr
    | POKE LP numbertype COMMA expr COMMA expr RP
    """
    i = 2 if isinstance(p[2], Symbol) or p[2] is None else 3
    if p[i + 2] is None or p[i + 4] is None:
        p[0] = None
        return
    p[0] = make_sentence(
        p.lineno(1),
        "POKE",
        make_typecast(Type.uinteger, p[i + 2], p.lineno(i + 3)),
        make_typecast(p[i], p[i + 4], p.lineno(i + 5)),
    )


def p_out(p):
    """statement : OUT expr COMMA expr"""
    p[0] = make_sentence(
        p.lineno(1),
        "OUT",
        make_typecast(Type.uinteger, p[2], p.lineno(3)),
        make_typecast(Type.ubyte, p[4], p.lineno(4)),
    )


def p_simple_instruction(p):
    """statement : ITALIC expr
    | BOLD expr
    | INK expr
    | PAPER expr
    | BRIGHT expr
    | FLASH expr
    | OVER expr
    | INVERSE expr
    """
    p[0] = make_sentence(p.lineno(1), p[1], make_typecast(Type.ubyte, p[2], p.lineno(1)))


def p_save_code(p):
    """statement : SAVE expr CODE expr COMMA expr
    | SAVE expr ID
    | SAVE expr ARRAY_ID
    """
    expr = p[2]
    if expr.type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), expr.type_)

    if len(p) == 4:
        if p[3].upper() not in ("SCREEN", "SCREEN$"):
            error(p.lineno(3), 'Unexpected "%s" ID. Expected "SCREEN$" instead' % p[3])
            return None
        # ZX Spectrum screen start + length
        # This should be stored in a architecture-dependant file
        start = make_number(16384, lineno=p.lineno(1))
        length = make_number(6912, lineno=p.lineno(1))
    else:
        start = make_typecast(Type.uinteger, p[4], p.lineno(4))
        length = make_typecast(Type.uinteger, p[6], p.lineno(6))

    p[0] = make_sentence(p.lineno(1), p[1], expr, start, length)


def p_save_data(p):
    """statement : SAVE expr DATA
    | SAVE expr DATA ID
    | SAVE expr DATA ID LP RP
    """
    if p[2].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), p[2].type_)

    if len(p) != 4:
        entry = SYMBOL_TABLE.access_id(p[4], p.lineno(4))
        if entry is None:
            p[0] = None
            return

        mark_entry_as_accessed(entry)
        access = entry
        start = make_unary(p.lineno(4), "ADDRESS", access, type_=Type.uinteger)

        if entry.class_ == CLASS.array:
            length = make_number(entry.memsize, lineno=p.lineno(4))
        else:
            length = make_number(entry.type_.size, lineno=p.lineno(4))
    else:
        access = SYMBOL_TABLE.access_label(gl.ZXBASIC_USER_DATA, p.lineno(3), SYMBOL_TABLE.global_scope)
        start = make_unary(p.lineno(3), "ADDRESS", access, type_=Type.uinteger)

        access = SYMBOL_TABLE.access_label(gl.ZXBASIC_USER_DATA_LEN, p.lineno(3), SYMBOL_TABLE.global_scope)
        length = make_unary(p.lineno(3), "ADDRESS", access, type_=Type.uinteger)

    p[0] = make_sentence(p.lineno(1), p[1], p[2], start, length)


def p_load_or_verify(p):
    """load_or_verify : LOAD
    | VERIFY
    """
    p[0] = p[1]


def p_load_code(p):
    """statement : load_or_verify expr ID
    | load_or_verify expr CODE
    | load_or_verify expr CODE expr
    | load_or_verify expr CODE expr COMMA expr
    """
    if p[2].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(3), p[2].type_)

    if len(p) == 4:
        if p[3].upper() not in ("SCREEN", "SCREEN$", "CODE"):
            error(p.lineno(3), 'Unexpected "%s" ID. Expected "SCREEN$" instead' % p[3])
            return None
        if p[3].upper() == "CODE":  # LOAD "..." CODE
            start = make_number(0, lineno=p.lineno(3))
            length = make_number(0, lineno=p.lineno(3))
        else:  # SCREEN$
            start = make_number(16384, lineno=p.lineno(3))
            length = make_number(6912, lineno=p.lineno(3))
    else:
        start = make_typecast(Type.uinteger, p[4], p.lineno(3))

        if len(p) == 5:
            length = make_number(0, lineno=p.lineno(3))
        else:
            length = make_typecast(Type.uinteger, p[6], p.lineno(5))

    p[0] = make_sentence(p.lineno(3), p[1], p[2], start, length)


def p_load_data(p):
    """statement : load_or_verify expr DATA
    | load_or_verify expr DATA ID
    | load_or_verify expr DATA ID LP RP
    """
    if p[2].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), p[2].type_)

    if len(p) != 4:
        entry = SYMBOL_TABLE.access_id(p[4], p.lineno(4))
        if entry is None:
            p[0] = None
            return

        mark_entry_as_accessed(entry)
        start = make_unary(p.lineno(4), "ADDRESS", entry, type_=Type.uinteger)

        if entry.class_ == CLASS.array:
            length = make_number(entry.memsize, lineno=p.lineno(4))
        else:
            length = make_number(entry.type_.size, lineno=p.lineno(4))
    else:
        entry = SYMBOL_TABLE.access_label(gl.ZXBASIC_USER_DATA, p.lineno(3), SYMBOL_TABLE.global_scope)
        start = make_unary(p.lineno(3), "ADDRESS", entry, type_=Type.uinteger)

        entry = SYMBOL_TABLE.access_label(gl.ZXBASIC_USER_DATA_LEN, p.lineno(3), SYMBOL_TABLE.global_scope)
        length = make_unary(p.lineno(3), "ADDRESS", entry, type_=Type.uinteger)

    p[0] = make_sentence(p.lineno(3), p[1], p[2], start, length)


def p_numbertype(p):
    """numbertype : BYTE
    | UBYTE
    | INTEGER
    | UINTEGER
    | LONG
    | ULONG
    | FIXED
    | FLOAT
    """
    p[0] = make_type(p[1].lower(), p.lineno(1))


def p_expr_plus_expr(p):
    """expr : expr PLUS expr"""
    p[0] = make_binary(p.lineno(2), "PLUS", p[1], p[3], lambda x, y: x + y)


def p_expr_minus_expr(p):
    """expr : expr MINUS expr"""
    p[0] = make_binary(p.lineno(2), "MINUS", p[1], p[3], lambda x, y: x - y)


def p_expr_mul_expr(p):
    """expr : expr MUL expr"""
    p[0] = make_binary(p.lineno(2), "MUL", p[1], p[3], lambda x, y: x * y)


def p_expr_div_expr(p):
    """expr : expr DIV expr"""
    p[0] = make_binary(p.lineno(2), "DIV", p[1], p[3], lambda x, y: x / y)


def p_expr_mod_expr(p):
    """expr : expr MOD expr"""
    p[0] = make_binary(p.lineno(2), "MOD", p[1], p[3], lambda x, y: x % y)


def p_expr_pow_expr(p):
    """expr : expr POW expr"""
    p[0] = make_binary(
        p.lineno(2),
        "POW",
        make_typecast(Type.float_, p[1], p.lineno(2)),
        make_typecast(Type.float_, p[3], p.lexer.lineno),
        lambda x, y: x**y,
    )


def p_expr_shl_expr(p):
    """expr : expr SHL expr"""
    if p[1] is None or p[3] is None:
        p[0] = None
        return

    if p[1].type_ in (Type.float_, Type.fixed):
        p[1] = make_typecast(Type.ulong, p[1], p.lineno(2))

    p[0] = make_binary(
        p.lineno(2),
        "SHL",
        p[1],
        make_typecast(Type.ubyte, p[3], p.lineno(2)),
        lambda x, y: x << y,
    )


def p_expr_shr_expr(p):
    """expr : expr SHR expr"""
    if p[1] is None or p[3] is None:
        p[0] = None
        return

    if p[1].type_ in (Type.float_, Type.fixed):
        p[1] = make_typecast(Type.ulong, p[1], p.lineno(2))

    p[0] = make_binary(
        p.lineno(2),
        "SHR",
        p[1],
        make_typecast(Type.ubyte, p[3], p.lineno(2)),
        lambda x, y: x >> y,
    )


def p_minus_expr(p):
    """expr : MINUS expr %prec UMINUS"""
    p[0] = make_unary(p.lineno(1), "MINUS", p[2], lambda x: -x)


def p_expr_EQ_expr(p):
    """expr : expr EQ expr"""
    p[0] = make_binary(p.lineno(2), "EQ", p[1], p[3], lambda x, y: x == y)


def p_expr_LT_expr(p):
    """expr : expr LT expr"""
    p[0] = make_binary(p.lineno(2), "LT", p[1], p[3], lambda x, y: x < y)


def p_expr_LE_expr(p):
    """expr : expr LE expr"""
    p[0] = make_binary(p.lineno(2), "LE", p[1], p[3], lambda x, y: x <= y)


def p_expr_GT_expr(p):
    """expr : expr GT expr"""
    p[0] = make_binary(p.lineno(2), "GT", p[1], p[3], lambda x, y: x > y)


def p_expr_GE_expr(p):
    """expr : expr GE expr"""
    p[0] = make_binary(p.lineno(2), "GE", p[1], p[3], lambda x, y: x >= y)


def p_expr_NE_expr(p):
    """expr : expr NE expr"""
    p[0] = make_binary(p.lineno(2), "NE", p[1], p[3], lambda x, y: x != y)


def p_expr_OR_expr(p):
    """expr : expr OR expr"""
    p[0] = make_binary(p.lineno(2), "OR", p[1], p[3], lambda x, y: x or y)


def p_expr_BOR_expr(p):
    """expr : expr BOR expr"""
    p[0] = make_binary(p.lineno(2), "BOR", p[1], p[3], lambda x, y: x | y)


def p_expr_XOR_expr(p):
    """expr : expr XOR expr"""
    p[0] = make_binary(p.lineno(2), "XOR", p[1], p[3], lambda x, y: (x and not y) or (not x and y))


def p_expr_BXOR_expr(p):
    """expr : expr BXOR expr"""
    p[0] = make_binary(p.lineno(2), "BXOR", p[1], p[3], lambda x, y: x ^ y)


def p_expr_AND_expr(p):
    """expr : expr AND expr"""
    p[0] = make_binary(p.lineno(2), "AND", p[1], p[3], lambda x, y: x and y)


def p_expr_BAND_expr(p):
    """expr : expr BAND expr"""
    p[0] = make_binary(p.lineno(2), "BAND", p[1], p[3], lambda x, y: x & y)


def p_NOT_expr(p):
    """expr : NOT expr"""
    p[0] = make_unary(p.lineno(1), "NOT", p[2], lambda x: not x)


def p_BNOT_expr(p):
    """expr : BNOT expr"""
    p[0] = make_unary(p.lineno(1), "BNOT", p[2], lambda x: ~x)


def p_lp_expr_rp(p):
    """bexpr : LP expr RP %prec ID"""
    p[0] = p[2]


def p_cast(p):
    """expr : CAST LP numbertype COMMA expr RP"""
    p[0] = make_typecast(p[3], p[5], p.lineno(6))


def p_number_expr(p):
    """bexpr : NUMBER"""
    p[0] = make_number(p[1], lineno=p.lineno(1))


def p_expr_PI(p):
    """bexpr : PI"""
    p[0] = make_number(PI, lineno=p.lineno(1), type_=Type.float_)


def p_expr_string(p):
    """bexpr : string %prec ID"""
    p[0] = p[1]


def p_string_func_call(p):
    """string : func_call substr"""
    p[0] = make_strslice(p.lineno(1), p[1], p[2][0], p[2][1])


def p_string_func_call_single(p):
    """string : func_call LP expr RP"""
    p[0] = make_strslice(p.lineno(1), p[1], p[3], p[3])


def p_string_str(p):
    """string : STRC"""
    p[0] = sym.STRING(p[1], p.lineno(1))


def p_string_lprp(p):
    """string : string LP RP"""
    p[0] = p[1]


def p_string_lp_expr_rp(p):
    """string : string LP expr RP"""
    p[0] = make_strslice(p.lineno(2), p[1], p[3], p[3])


def p_expr_id_substr(p):
    """string : ID substr"""
    entry = SYMBOL_TABLE.get_entry(p[1])
    if entry is not None and entry.type_ == Type.string and entry.token == "CONST":
        p[0] = make_strslice(p.lineno(1), entry, p[2][0], p[2][1])
        return

    entry = SYMBOL_TABLE.access_var(p[1], p.lineno(1), default_type=Type.string)
    p[0] = None
    if entry is None:
        return

    mark_entry_as_accessed(entry)
    p[0] = make_strslice(p.lineno(1), entry, p[2][0], p[2][1])


def p_string_substr(p):
    """string : string substr"""
    p[0] = make_strslice(p.lineno(1), p[1], p[2][0], p[2][1])


def p_string_expr_lp(p):
    """string : LP expr RP substr"""
    if p[2].type_ != Type.string:
        error(
            p.lexer.lineno,
            "Expected a string type expression. Got %s type instead" % Type.to_string(p[2].type_),
        )
        p[0] = None
    else:
        p[0] = make_strslice(p.lexer.lineno, p[2], p[4][0], p[4][1])


def p_subind_str(p):
    """substr : LP expr TO expr RP"""
    p[0] = (
        make_typecast(Type.uinteger, p[2], p.lineno(1)),
        make_typecast(Type.uinteger, p[4], p.lineno(3)),
    )


def p_subind_strTO(p):
    """substr : LP TO expr RP"""
    p[0] = (
        make_typecast(Type.uinteger, make_number(0, lineno=p.lineno(2)), p.lineno(1)),
        make_typecast(Type.uinteger, p[3], p.lineno(2)),
    )


def p_subind_TOstr(p):
    """substr : LP expr TO RP"""
    p[0] = (
        make_typecast(Type.uinteger, p[2], p.lineno(1)),
        make_typecast(
            Type.uinteger,
            make_number(gl.MAX_STRSLICE_IDX, lineno=p.lineno(4)),
            lineno=p.lineno(4),
        ),
        p.lineno(3),
    )


def p_subind_TO(p):
    """substr : LP TO RP"""
    p[0] = (
        make_typecast(Type.uinteger, make_number(0, lineno=p.lineno(2)), p.lineno(1)),
        make_typecast(
            Type.uinteger,
            make_number(gl.MAX_STRSLICE_IDX, lineno=p.lineno(3)),
            p.lineno(2),
        ),
    )


def p_id_expr(p):
    """bexpr : ID"""
    entry = SYMBOL_TABLE.access_id(p[1], p.lineno(1), default_class=CLASS.var)
    if entry is None:
        p[0] = None
        return

    mark_entry_as_accessed(entry)
    if entry.type_ == Type.auto:
        entry.type_ = _TYPEREF(gl.DEFAULT_TYPE)
        errmsg.warning_implicit_type(p.lineno(1), p[1], entry.type_.name)

    p[0] = entry

    if entry.class_ == CLASS.array:  # HINT: This should never happen now
        if not LET_ASSIGNMENT:
            error(
                p.lineno(1),
                "Variable '%s' is an array and cannot be used in this context" % p[1],
            )
            p[0] = None
    elif entry.class_ == CLASS.function:  # Function call with 0 args
        p[0] = make_call(p[1], p.lineno(1), make_arg_list(None))
    elif entry.class_ == CLASS.sub:  # Forbidden for subs
        errmsg.syntax_error_is_a_sub_not_a_func(p.lineno(1), p[1])
        p[0] = None


def p_addr_of_id(p):
    """bexpr : ADDRESSOF singleid"""
    id_: Id = p[2]
    # Access id. For @ operator we ignore the explicit flag
    entry = SYMBOL_TABLE.access_id(id_.name, id_.lineno, ignore_explicit_flag=True)
    if entry is None:
        p[0] = None
        return

    entry.has_address = True
    mark_entry_as_accessed(entry)
    result = make_unary(p.lineno(1), "ADDRESS", entry, type_=_TYPE(gl.PTR_TYPE))

    if is_dynamic(entry):
        p[0] = result
    else:
        p[0] = make_constexpr(p.lineno(1), result)


def p_expr_bexpr(p):
    """expr : bexpr"""
    p[0] = p[1]


def p_expr_funccall(p):
    """bexpr : func_call %prec ID"""
    p[0] = p[1]


def p_idcall_expr(p):
    """func_call : ID arg_list %prec UMINUS"""  # This can be a function call or a string index
    if p[2] is None:
        p[0] = None
        return

    p[0] = make_call(p[1], p.lineno(1), p[2])
    if p[0] is None:
        return

    if p[0].token in ("STRSLICE", "ID", "STRING") or p[0].token == "CONST" and p[0].type_ == Type.string:
        entry = SYMBOL_TABLE.access_call(p[1], p.lineno(1))
        mark_entry_as_accessed(entry)
        return

    convert_to_function(p[0].entry, CLASS.function, p.lineno(1))
    mark_entry_as_accessed(p[0].entry)


def p_array_eq_error(p):
    """statement : LET ARRAY_ID EQ expr"""
    error(p.lineno(4), f"Invalid assignment. Variable {p[2]}() is an array")
    p[0] = None


def p_arr_access_expr(p):
    """func_call : ARRAY_ID arg_list"""  # This is an array access
    p[0] = make_call(p[1], p.lineno(1), p[2])
    if p[0] is None:
        return

    entry = SYMBOL_TABLE.access_call(p[1], p.lineno(1))
    mark_entry_as_accessed(entry)


def p_let_arr_substr(p):
    """statement : LET ARRAY_ID arg_list substr EQ expr
    | ARRAY_ID arg_list substr EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 1]
    substr = p[i + 2]
    expr_ = p[i + 4]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_let_arr_substr_single(p):
    """statement : LET ARRAY_ID arg_list LP expr RP EQ expr
    | ARRAY_ID arg_list LP expr RP EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 1]
    substr = (p[i + 3], p[i + 3])
    expr_ = p[i + 6]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_let_arr_substr_in_args(p):
    """statement : LET ARRAY_ID LP arguments TO RP EQ expr
    | ARRAY_ID LP arguments TO RP EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 2]
    substr = (
        arg_list.children.pop().value,
        make_number(gl.MAX_STRSLICE_IDX, lineno=p.lineno(i + 3)),
    )
    expr_ = p[i + 6]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_let_arr_substr_in_args2(p):
    """statement : LET ARRAY_ID LP arguments COMMA TO expr RP EQ expr
    | ARRAY_ID LP arguments COMMA TO expr RP EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 2]
    top_ = p[i + 5]
    substr = (make_number(0, lineno=p.lineno(i + 4)), top_)
    expr_ = p[i + 8]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_let_arr_substr_in_args3(p):
    """statement : LET ARRAY_ID LP arguments COMMA TO RP EQ expr
    | ARRAY_ID LP arguments COMMA TO RP EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 2]
    substr = (
        make_number(0, lineno=p.lineno(i + 4)),
        make_number(gl.MAX_STRSLICE_IDX, lineno=p.lineno(i + 3)),
    )
    expr_ = p[i + 7]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_let_arr_substr_in_args4(p):
    """statement : LET ARRAY_ID LP arguments TO expr RP EQ expr
    | ARRAY_ID LP arguments TO expr RP EQ expr
    """
    i = 2 if p[1].upper() == "LET" else 1

    id_ = p[i]
    arg_list = p[i + 2]
    substr = (arg_list.children.pop().value, p[i + 4])
    expr_ = p[i + 7]
    p[0] = make_array_substr_assign(p.lineno(i), id_, arg_list, substr, expr_)


def p_addr_of_array_element(p):
    """bexpr : ADDRESSOF ARRAY_ID arg_list"""
    p[0] = None

    if p[3] is None:
        return

    result = make_array_access(p[2], p.lineno(2), p[3])
    if result is None:
        return

    mark_entry_as_accessed(result.entry)
    p[0] = make_unary(p.lineno(1), "ADDRESS", result, type_=_TYPE(gl.PTR_TYPE))


def p_err_undefined_arr_access(p):
    """bexpr : ADDRESSOF ID arg_list"""
    error(p.lineno(2), 'Undeclared array "%s"' % p[2])
    p[0] = None


def p_bexpr_func(p):
    """bexpr : ID bexpr"""
    args = make_arg_list(make_argument(p[2], p.lineno(2)))
    p[0] = make_call(p[1], p.lineno(1), args)
    if p[0] is None:
        return

    if p[0].token in ("STRSLICE", "VAR", "STRING"):
        entry = SYMBOL_TABLE.access_call(p[1], p.lineno(1))
        mark_entry_as_accessed(entry)
        return

    convert_to_function(p[0].entry, CLASS.function, p.lineno(1))
    mark_entry_as_accessed(p[0].entry)


def p_arg_list(p):
    """arg_list : LP RP"""
    p[0] = make_arg_list(None)


def p_arg_list_arg(p):
    """arg_list : LP arguments RP"""
    p[0] = p[2]


def p_arguments(p):
    """arguments : argument"""
    if p[1] is None:
        p[0] = None
        return

    p[0] = make_arg_list(p[1])


def p_arguments_argument(p):
    """arguments : arguments COMMA argument"""
    if p[1] is None or p[3] is None:
        p[0] = None
    else:
        p[0] = make_arg_list(p[1], p[3])


def p_argument(p):
    """argument : expr %prec ID"""
    p[0] = make_argument(p[1], p.lineno(1))


def p_named_argument(p):
    """argument : ID WEQ expr %prec ID"""
    p[0] = make_argument(p[3], p.lineno(1), name=p[1])


def p_argument_array(p):
    """argument : ARRAY_ID"""
    entry = SYMBOL_TABLE.access_array(p[1], p.lineno(1))
    if entry is None:
        p[0] = None
        return

    mark_entry_as_accessed(entry)
    p[0] = make_argument(entry, p.lineno(1))


def p_funcdecl(p):
    """function_declaration : function_header function_body"""
    if p[1] is None:
        p[0] = None
        return

    p[0] = p[1]
    p[0].local_symbol_table = SYMBOL_TABLE.current_scope
    p[0].locals_size = SYMBOL_TABLE.leave_scope()
    FUNCTION_LEVEL.pop()
    p[0].entry.ref.body = p[2]
    p[0].local_symbol_table.owner = p[0]
    p[0].entry.ref.forwarded = False


def p_funcdeclforward(p):
    """function_declaration : DECLARE function_header_pre"""
    if p[2] is None:
        if FUNCTION_LEVEL:
            FUNCTION_LEVEL.pop()
        return

    if p[2].entry.forwarded:
        error(p.lineno(1), "duplicated declaration for function '%s'" % p[2].name)

    p[2].entry.ref.forwarded = True
    SYMBOL_TABLE.leave_scope(show_warnings=False)
    FUNCTION_LEVEL.pop()


def p_function_header(p):
    """function_header : function_header_pre CO
    | function_header_pre NEWLINE
    """
    p[0] = p[1]


def p_function_header_error(p):
    """function_header : function_def error CO
    | function_def error NEWLINE
    """
    p[0] = None


def p_function_header_pre(p):
    """function_header_pre : function_def param_decl typedef"""
    if p[1] is None or p[2] is None:
        p[0] = None
        return

    forwarded = p[1].entry.forwarded

    p[0] = p[1]
    p[0].append_child(p[2])
    p[0].params_size = p[2].size
    lineno = p.lineno(3)

    previoustype_ = p[0].type_
    if not p[3].implicit or p[0].entry.type_ is None or p[0].entry.type_ == Type.unknown:
        p[0].type_ = p[3]
        if p[3].implicit and p[0].entry.class_ == CLASS.function:
            errmsg.warning_implicit_type(p[3].lineno, p[0].entry.name, p[0].type_.name)

    if forwarded and previoustype_ != p[0].type_:
        errmsg.syntax_error_func_type_mismatch(lineno, p[0].entry)
        p[0] = None
        return

    if forwarded:  # Was predeclared, check parameters match
        p1 = p[0].entry.ref.params  # Param list previously declared
        p2 = p[2].children

        if len(p1) != len(p2):
            errmsg.syntax_error_parameter_mismatch(lineno, p[0].entry)
            p[0] = None
            return

        for a, b in zip(p1, p2):
            if a.name != b.name:
                warning(
                    lineno,
                    "Parameter '%s' in function '%s' has been renamed to '%s'" % (a.name, p[0].name, b.name),
                )

            if a.type_ != b.type_ or a.byref != b.byref:
                errmsg.syntax_error_parameter_mismatch(lineno, p[0].entry)
                p[0] = None
                return

    p[0].entry.ref.params = p[2]

    if FUNCTION_LEVEL[-1].class_ == CLASS.sub and not p[3].implicit:
        error(lineno, "SUBs cannot have a return type definition")
        p[0] = None
        return

    if FUNCTION_LEVEL[-1].class_ == CLASS.function:
        src.api.check.check_type_is_explicit(p[0].lineno, p[0].entry.name, p[3])

    if p[0].entry.convention == CONVENTION.fastcall and len(p[2]) > 1:
        class_ = "SUB" if FUNCTION_LEVEL[-1].class_ == CLASS.sub else "FUNCTION"
        errmsg.warning_fastcall_with_N_parameters(lineno, class_, p[0].entry.name, len(p[2]))


def p_function_error(p):
    """function_declaration : function_header program_co END error"""
    p[0] = None
    error(
        p.lineno(3),
        "Unexpected token 'END'. Expected 'END FUNCTION' or 'END SUB' instead.",
    )


def p_function_def(p):
    """function_def : FUNCTION convention ID
    | SUB convention ID
    """
    convention = p[2]
    name = p[3]
    class_ = CLASS.sub if p[1] == "SUB" else CLASS.function  # Must be 'function' or 'sub'

    p[0] = make_func_declaration(name, p.lineno(3), class_)
    SYMBOL_TABLE.enter_scope(name)
    entry = SYMBOL_TABLE.get_entry(name)
    FUNCTION_LEVEL.append(entry)

    if entry.class_ in (CLASS.function, CLASS.sub):  # Was correctly declared?
        FUNCTION_LEVEL[-1].ref.convention = convention


def p_convention(p):
    """convention :
    | STDCALL
    """
    p[0] = CONVENTION.stdcall


def p_convention2(p):
    """convention : FASTCALL"""
    p[0] = CONVENTION.fastcall


def p_param_decl_none(p):
    """param_decl :
    | LP RP
    """
    p[0] = make_param_list(None)


def p_param_decl(p):
    """param_decl : LP param_decl_list RP"""
    p[0] = p[2]


def p_param_decl_errpr(p):
    """param_decl : LP error RP"""
    p[0] = None


def p_param_decl_list(p):
    """param_decl_list : param_definition"""
    p[0] = make_param_list(p[1])


def p_param_decl_list2(p):
    """param_decl_list : param_decl_list COMMA param_definition"""
    if p[1] is not None and p[3] is not None:  # No errors in parsing
        if p[3].default_value is None and p[1][-1].default_value is not None:
            errmsg.syntax_error_mandatory_param_after_optional(p[3].lineno, p[1][-1].name, p[3].name)

    p[0] = make_param_list(p[1], p[3])


def p_param_byref_definition(p):
    """param_definition : BYREF param_def"""
    p[0] = p[2]

    if p[0] is not None:
        p[0].ref.byref = True


def p_param_byval_definition(p):
    """param_definition : BYVAL param_def"""
    param_def = p[2]
    p[0] = param_def

    if p[0] is not None:
        if param_def.class_ == CLASS.array:
            errmsg.syntax_error_cannot_pass_array_by_value(p.lineno(1), param_def.name)
            p[0] = None
            return
        param_def.ref.byref = False


def p_param_definition(p):
    """param_definition : param_def"""
    param_def = p[1]
    p[0] = param_def
    if p[0] is not None:
        if param_def.class_ == CLASS.array:
            param_def.ref.byref = True
        else:
            param_def.ref.byref = OPTIONS.default_byref


def p_param_def_array(p):
    """param_def : singleid LP RP typedef"""
    typeref = p[4]
    if typeref is None:
        p[0] = None
        return

    lineno = p[1].lineno
    id_ = p[1].name

    src.api.check.check_type_is_explicit(lineno, id_, typeref)
    p[0] = make_param_decl(id_, lineno, typeref, is_array=True)


def p_param_def_type(p):
    """param_def : singleid typedef default_arg_value"""
    id_: Id = p[1]
    typedef = p[2]
    if typedef is not None:
        src.api.check.check_type_is_explicit(id_.lineno, id_.name, typedef)

    default_value = make_typecast(typedef, p[3], id_.lineno)
    p[0] = make_param_decl(
        id_.name,
        id_.lineno,
        typedef,
        is_array=False,
        default_value=default_value,
    )


def p_param_def_default_arg_value(p):
    """default_arg_value :
    | EQ expr
    """
    if len(p) == 1:
        p[0] = None
        return

    p[0] = p[2]
    return


def p_function_body(p):
    """function_body : program_co END FUNCTION
    | program_co END SUB
    | statements_co END FUNCTION
    | statements_co END SUB
    | co_statements_co END FUNCTION
    | co_statements_co END SUB
    | END FUNCTION
    | END SUB
    """
    if not FUNCTION_LEVEL:
        error(
            p.lineno(3),
            "Unexpected token 'END %s'. No Function or Sub has been defined." % p[2],
        )
        p[0] = None
        return

    a = FUNCTION_LEVEL[-1].class_
    if a not in (
        CLASS.sub,
        CLASS.function,
    ):  # This function/sub was not correctly declared, so exit now
        p[0] = None
        return

    i = 2 if p[1] == "END" else 3
    b = p[i].lower()

    if a != b:
        error(
            p.lineno(i),
            "Unexpected token 'END %s'. Should be 'END %s'" % (b.upper(), a.upper()),
        )
        p[0] = None
    else:
        p[0] = make_block() if p[1] == "END" else p[1]


def p_type_def_empty(p):
    """typedef :"""  # Epsilon. Defaults to float
    p[0] = make_type(_TYPE(gl.DEFAULT_TYPE).name, p.lexer.lineno, implicit=True)


def p_type_def(p):
    """typedef : AS type"""  # Epsilon. Defaults to float
    p[0] = make_type(p[2], p.lineno(2), implicit=False)


def p_type(p):
    """type : BYTE
    | UBYTE
    | INTEGER
    | UINTEGER
    | LONG
    | ULONG
    | FIXED
    | FLOAT
    | STRING
    """
    p[0] = p[1].lower()


# region PREPROC

# ----------------------------------------
# PREPROCESSOR lines starting with:
#
#  #pragma
#  #init
#  #require
#
# are processed here and not in the lexer
# ----------------------------------------


def p_preproc_line_init(p):
    """preproc_line : _INIT ID"""
    INITS.add(p[2])


def p_preproc_line_require(p):
    """preproc_line : _REQUIRE STRING"""
    arch.target.backend.REQUIRES.add(p[2])


def p_preproc_line_pragma_option(p):
    """preproc_line : _PRAGMA ID EQ ID
    | _PRAGMA ID EQ STRING
    | _PRAGMA ID EQ INTEGER
    """
    try:
        setattr(OPTIONS, p[2], p[4])
    except src.api.options.UndefinedOptionError:
        errmsg.warning_ignoring_unknown_pragma(p.lineno(2), p[2])


def p_preproc_pragma_push(p):
    """preproc_line : _PRAGMA _PUSH LP ID RP"""
    try:
        OPTIONS[p[4]].push()
    except src.api.options.UndefinedOptionError:
        errmsg.warning_ignoring_unknown_pragma(p.lineno(4), p[4])


def p_preproc_pragma_pop(p):
    """preproc_line : _PRAGMA _POP LP ID RP"""
    try:
        OPTIONS[p[4]].pop()
    except src.api.options.UndefinedOptionError:
        errmsg.warning_ignoring_unknown_pragma(p.lineno(4), p[4])


# region INTERNAL FUNCTIONS
# -------------------------------------------
# INTERNAL BASIC Functions
# These will be implemented in the translator
# module as a CALL to an ASM function
# -------------------------------------------


def p_expr_usr(p):
    """bexpr : USR bexpr %prec UMINUS"""
    if p[2].type_ == Type.string:
        p[0] = make_builtin(p.lineno(1), "USR_STR", p[2], type_=Type.uinteger)
    else:
        p[0] = make_builtin(
            p.lineno(1),
            "USR",
            make_typecast(Type.uinteger, p[2], p.lineno(1)),
            type_=Type.uinteger,
        )


def p_expr_rnd(p):
    """bexpr : RND %prec ID
    | RND LP RP
    """
    p[0] = make_builtin(p.lineno(1), "RND", None, type_=Type.float_)


def p_expr_peek(p):
    """bexpr : PEEK bexpr %prec UMINUS"""
    p[0] = make_builtin(
        p.lineno(1),
        "PEEK",
        make_typecast(Type.uinteger, p[2], p.lineno(1)),
        type_=Type.ubyte,
    )


def p_expr_peektype_(p):
    """bexpr : PEEK LP numbertype COMMA expr RP"""
    if p[3] is None or p[5] is None:
        p[0] = None
        return

    p[0] = make_builtin(
        p.lineno(1),
        "PEEK",
        make_typecast(Type.uinteger, p[5], p.lineno(4)),
        type_=cast(sym.TYPEREF, p[3]).type_,
    )


def p_expr_in(p):
    """bexpr : IN bexpr %prec UMINUS"""
    p[0] = make_builtin(
        p.lineno(1),
        "IN",
        make_typecast(Type.uinteger, p[2], p.lineno(1)),
        type_=Type.ubyte,
    )


def p_expr_lbound(p):
    """bexpr : LBOUND LP ARRAY_ID RP
    | UBOUND LP ARRAY_ID RP
    """
    entry = SYMBOL_TABLE.access_array(p[3], p.lineno(3))
    if entry is None:
        p[0] = None
        return

    mark_entry_as_accessed(entry)

    if entry.scope == SCOPE.parameter:
        num = make_number(0, p.lineno(3), Type.uinteger)
        p[0] = make_builtin(p.lineno(1), p[1], [entry, num], type_=Type.uinteger)
    else:
        p[0] = make_number(len(entry.bounds), p.lineno(3), Type.uinteger)


def p_expr_lbound_expr(p):
    """bexpr : LBOUND LP ARRAY_ID COMMA expr RP
    | UBOUND LP ARRAY_ID COMMA expr RP
    """
    expr = p[5]
    if expr is None:
        p[0] = None
        return

    entry = SYMBOL_TABLE.access_array(p[3], p.lineno(3))
    if entry is None:
        p[0] = None
        return

    mark_entry_as_accessed(entry)
    num = make_typecast(Type.uinteger, expr, p.lineno(6))
    if num is None:
        p[0] = None
        return

    if is_number(num) and entry.scope in (
        SCOPE.local,
        SCOPE.global_,
    ):  # Try constant propagation
        val = num.value
        if val < 0 or val > len(entry.bounds):
            error(p.lineno(6), "Dimension out of range")
            p[0] = None
            return

        if not val:  # 0 => number of dims
            p[0] = make_number(len(entry.bounds), p.lineno(3), Type.uinteger)
        elif p[1] == "LBOUND":
            p[0] = make_number(entry.bounds[val - 1].lower, p.lineno(3), Type.uinteger)
        else:
            p[0] = make_number(entry.bounds[val - 1].upper, p.lineno(3), Type.uinteger)
        return

    if p[1] == "LBOUND":
        entry.ref.lbound_used = True
    else:
        entry.ref.ubound_used = True

    p[0] = make_builtin(p.lineno(1), p[1], [entry, num], type_=Type.uinteger)


def p_len(p):
    """bexpr : LEN bexpr %prec UMINUS"""
    arg = p[2]
    if arg is None:
        p[0] = None
    elif arg.token == "VAR" and arg.class_ == CLASS.array:
        p[0] = make_number(len(arg.bounds), lineno=p.lineno(1))  # Do constant folding
    elif arg.type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), Type.to_string(arg.type_))
        p[0] = None
    elif is_string(arg):  # Constant string?
        p[0] = make_number(len(arg.value), lineno=p.lineno(1))  # Do constant folding
    else:
        p[0] = make_builtin(p.lineno(1), "LEN", arg, type_=Type.uinteger)


def p_sizeof(p):
    """bexpr : SIZEOF LP type RP
    | SIZEOF LP ID RP
    | SIZEOF LP ARRAY_ID RP
    """
    if Type.to_type(p[3].lower()) is not None:
        p[0] = make_number(Type.size(Type.to_type(p[3].lower())), lineno=p.lineno(3))
    else:
        entry = SYMBOL_TABLE.get_id_or_make_var(p[3], p.lineno(1))
        p[0] = make_number(Type.size(entry.type_), lineno=p.lineno(3))


def p_str(p):
    """string : STR expr %prec UMINUS"""
    if is_number(p[2]):  # A constant is converted to string directly
        p[0] = sym.STRING(str(p[2].value), p.lineno(1))
    else:
        p[0] = make_builtin(
            p.lineno(1),
            "STR",
            make_typecast(Type.float_, p[2], p.lineno(1)),
            type_=Type.string,
        )


def p_inkey(p):
    """string : INKEY"""
    p[0] = make_builtin(p.lineno(1), "INKEY", None, type_=Type.string)


def p_chr_one(p):
    """string : CHR bexpr %prec UMINUS"""
    arg_list = make_arg_list(make_argument(p[2], p.lineno(1)))
    arg_list[0].value = make_typecast(Type.ubyte, arg_list[0].value, p.lineno(1))
    p[0] = make_builtin(p.lineno(1), "CHR", arg_list, type_=Type.string)


def p_chr(p):
    """string : CHR arg_list"""
    if len(p[2]) < 1:
        error(p.lineno(1), "CHR$ function need at less 1 parameter")
        p[0] = None
        return

    for i in range(len(p[2])):  # Convert every argument to 8bit unsigned
        p[2][i].value = make_typecast(Type.ubyte, p[2][i].value, p.lineno(1))

    p[0] = make_builtin(p.lineno(1), "CHR", p[2], type_=Type.string)


def p_val(p):
    """bexpr : VAL bexpr %prec UMINUS"""

    def val(s):
        try:
            x = float(eval(s, {}, {}))
        except:
            x = 0
            warning(p.lineno(1), f"Invalid string numeric constant '{s}' evaluated as 0")
        return x

    if p[2].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), Type.to_string(p[2].type_))
        p[0] = None
    else:
        p[0] = make_builtin(p.lineno(1), "VAL", p[2], lambda x: val(x), type_=Type.float_)


def p_code(p):
    """bexpr : CODE bexpr %prec UMINUS"""

    def asc(x):
        if len(x):
            return ord(x[0])

        return 0

    if p[2] is None:
        p[0] = None
        return

    if p[2].type_ != Type.string:
        errmsg.syntax_error_expected_string(p.lineno(1), Type.to_string(p[2].type_))
        p[0] = None
    else:
        p[0] = make_builtin(p.lineno(1), "CODE", p[2], lambda x: asc(x), type_=Type.ubyte)


def p_sgn(p):
    """bexpr : SGN bexpr %prec UMINUS"""
    sgn = lambda x: x < 0 and -1 or x > 0 and 1 or 0

    if p[2].type_ == Type.string:
        error(p.lineno(1), "Expected a numeric expression, got TYPE.string instead")
        p[0] = None
    else:
        if is_unsigned(p[2]) and not is_number(p[2]):
            warning(p.lineno(1), "Sign of unsigned value is always 0 or 1")

        p[0] = make_builtin(p.lineno(1), "SGN", p[2], lambda x: sgn(x), type_=Type.byte_)


# ----------------------------------------
# Trigonometric and LN, EXP, SQR
# ----------------------------------------
def p_expr_trig(p):
    """bexpr : math_fn bexpr %prec UMINUS"""
    p[0] = make_builtin(
        p.lineno(1),
        p[1],
        make_typecast(Type.float_, p[2], p.lineno(1)),
        {
            "SIN": math.sin,
            "COS": math.cos,
            "TAN": math.tan,
            "ASN": math.asin,
            "ACS": math.acos,
            "ATN": math.atan,
            "LN": lambda y: math.log(y, math.exp(1)),  # LN(x)
            "EXP": math.exp,
            "SQR": math.sqrt,
        }[p[1]],
        type_=Type.float_,
    )


def p_math_fn(p):
    """math_fn : SIN
    | COS
    | TAN
    | ASN
    | ACS
    | ATN
    | LN
    | EXP
    | SQR
    """
    p[0] = p[1]


# ----------------------------------------
# Other important functions
# ----------------------------------------
def p_expr_int(p):
    """bexpr : INT bexpr %prec UMINUS"""
    p[0] = make_typecast(Type.long_, p[2], p.lineno(1))


def p_abs(p):
    """bexpr : ABS bexpr %prec UMINUS"""
    if is_unsigned(p[2]):
        p[0] = p[2]
        warning(p.lineno(1), "Redundant operation ABS for unsigned value")
        return

    p[0] = make_builtin(p.lineno(1), "ABS", p[2], lambda x: x if x >= 0 else -x)


# endregion


# ----------------------------------------
# The yyerror function
# ----------------------------------------
def p_error(p):
    if p is not None:
        if p.type != "NEWLINE":
            msg = "Syntax Error. Unexpected token '%s' <%s>" % (p.value, p.type)
        else:
            msg = "Unexpected end of line"
        error(p.lineno, msg)
        return

    # Try to give some hints
    if gl.LOOPS:  # some loop(s) are not closed
        loop_info = gl.LOOPS[-1]
        if loop_info.type == LoopType.FOR:
            errmsg.syntax_error_for_without_next(loop_info.lineno)
        else:
            errmsg.syntax_error_loop_not_closed(loop_info.lineno, loop_info.type.value)
    # If there were previous errors, stop here
    # since this end of file is due to previous errors
    if gl.has_errors:
        return

    msg = "Unexpected end of file"
    error(zxblex.lexer.lineno, msg)


# ----------------------------------------
# Initialization
# ----------------------------------------
parser = src.api.utils.get_or_create("zxbparser", lambda: yacc.yacc(debug=True))

ast = None
data_ast = None  # Global Variables AST
optemps = opcodestemps.OpcodesTemps()