add lowerCamel

Author: iuser

rustfmt.toml

@@ -0,0 +1,10 @@
+edition = "2021"
+tab_spaces = 4
+unstable_features = true
+condense_wildcard_suffixes = true
+newline_style = "Unix"
+use_field_init_shorthand = true
+use_try_shorthand = true
+imports_granularity = "Crate"
+group_imports = "StdExternalCrate"
+reorder_imports = true

src/segment.rs

@@ -1,7 +1,9 @@
-use crate::error::{Error, Result};
-use proc_macro::{token_stream, Delimiter, Ident, Span, TokenTree};
 use std::iter::Peekable;
 
+use proc_macro::{token_stream, Delimiter, Ident, Span, TokenTree};
+
+use crate::error::{Error, Result};
+
 pub(crate) enum Segment {
     String(LitStr),
     Apostrophe(Span),
@@ -192,6 +194,31 @@ pub(crate) fn paste(segments: &[Segment]) -> Result<String> {
                         }
                         evaluated.push(acc.to_lowercase());
                     }
+                    "lowerCamel" => {
+                        let mut acc = String::new();
+                        let mut prev = '_';
+                        for (idx, ch) in last.chars().enumerate() {
+                            if idx == 0 {
+                                for chl in ch.to_lowercase() {
+                                    acc.push(chl);
+                                }
+                            } else if ch != '_' {
+                                if prev == '_' {
+                                    for chu in ch.to_uppercase() {
+                                        acc.push(chu);
+                                    }
+                                } else if prev.is_uppercase() {
+                                    for chl in ch.to_lowercase() {
+                                        acc.push(chl);
+                                    }
+                                } else {
+                                    acc.push(ch);
+                                }
+                            }
+                            prev = ch;
+                        }
+                        evaluated.push(acc);
+                    }
                     "camel" => {
                         let mut acc = String::new();
                         let mut prev = '_';