Add Cangjie lexer#3108
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tested manually with various examples with latex\minted, seems to work well 
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Implements an ExtendedRegexLexer for the Cangjie programming language
with 20+ states covering annotations, quotes, generics, strings, and
expressions.
Key features:
- Contextual keywords (abstract/open/sealed/override/redef/internal)
highlighted as keywords before declarations, as identifiers elsewhere
- Triple-quoted strings, string interpolation (${expr}), raw strings
- Macro quote expressions with $() interpolation
- Generic parameters <T>, inheritance with <: operator
- VArray with $ prefix on size, number literals with underscores
12 test files with golden output covering all major syntax categories.
0 Error tokens across 500 stdlib files.
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Summary
This PR adds a lexer for the Cangjie programming language, a modern general-purpose programming language developed by Huawei.
About Cangjie
Cangjie is a high-level, statically typed, multi-paradigm programming language featuring:
The language was first released in June 2024 and was open-sourced in July 2025. It supports multiple platforms including HarmonyOS, Linux, Windows, macOS, Android, and iOS.
Official resources:
Lexer Implementation
The lexer uses
ExtendedRegexLexerto handle complex syntax features like multi-hash raw strings. Key features covered:let/var/const), functionsstruct,class,interface,enum,extend,prop,typeif/else,while,for-in,do-while,match/case,try/catch/finallyi32,f64, etc.), hex/octal/binary, runes#"..."#,##"..."##, etc.), interpolation (${...})foreign func,unsafeblocks,CPointer<T>macro package,quote(...),$interpolation,@expand,@Tuple,@Tokens@Test,@Benchmark,@Override,@Deprecated,@Available, custom annotations with complex argumentsTechnical highlights
LexerContextto efficiently match closing delimiters (#"..."#,##"..."##,###"..."###, etc.) with O(n) complexity instead of O(n²) backtracking@Annotation[...]including operators, lambdas{ => }, match expressions, and nested brackets with proper balancingTesting
The lexer includes comprehensive test coverage: 12 example files covering all major language features
Manual testing: