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223 lines
8.1 KiB
Python
223 lines
8.1 KiB
Python
"""
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pygments.lexers.rust
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~~~~~~~~~~~~~~~~~~~~
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Lexers for the Rust language.
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:copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from pygments.lexer import RegexLexer, include, bygroups, words, default
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from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
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Number, Punctuation, Whitespace
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__all__ = ['RustLexer']
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class RustLexer(RegexLexer):
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"""
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Lexer for the Rust programming language (version 1.47).
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"""
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name = 'Rust'
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url = 'https://www.rust-lang.org/'
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filenames = ['*.rs', '*.rs.in']
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aliases = ['rust', 'rs']
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mimetypes = ['text/rust', 'text/x-rust']
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version_added = '1.6'
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keyword_types = (words((
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'u8', 'u16', 'u32', 'u64', 'u128', 'i8', 'i16', 'i32', 'i64', 'i128',
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'usize', 'isize', 'f32', 'f64', 'char', 'str', 'bool',
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), suffix=r'\b'), Keyword.Type)
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builtin_funcs_types = (words((
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'Copy', 'Send', 'Sized', 'Sync', 'Unpin',
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'Drop', 'Fn', 'FnMut', 'FnOnce', 'drop',
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'Box', 'ToOwned', 'Clone',
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'PartialEq', 'PartialOrd', 'Eq', 'Ord',
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'AsRef', 'AsMut', 'Into', 'From', 'Default',
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'Iterator', 'Extend', 'IntoIterator', 'DoubleEndedIterator',
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'ExactSizeIterator',
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'Option', 'Some', 'None',
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'Result', 'Ok', 'Err',
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'String', 'ToString', 'Vec',
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), suffix=r'\b'), Name.Builtin)
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builtin_macros = (words((
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'asm', 'assert', 'assert_eq', 'assert_ne', 'cfg', 'column',
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'compile_error', 'concat', 'concat_idents', 'dbg', 'debug_assert',
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'debug_assert_eq', 'debug_assert_ne', 'env', 'eprint', 'eprintln',
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'file', 'format', 'format_args', 'format_args_nl', 'global_asm',
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'include', 'include_bytes', 'include_str',
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'is_aarch64_feature_detected',
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'is_arm_feature_detected',
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'is_mips64_feature_detected',
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'is_mips_feature_detected',
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'is_powerpc64_feature_detected',
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'is_powerpc_feature_detected',
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'is_x86_feature_detected',
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'line', 'llvm_asm', 'log_syntax', 'macro_rules', 'matches',
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'module_path', 'option_env', 'panic', 'print', 'println', 'stringify',
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'thread_local', 'todo', 'trace_macros', 'unimplemented', 'unreachable',
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'vec', 'write', 'writeln',
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), suffix=r'!'), Name.Function.Magic)
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tokens = {
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'root': [
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# rust allows a file to start with a shebang, but if the first line
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# starts with #![ then it's not a shebang but a crate attribute.
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(r'#![^[\r\n].*$', Comment.Preproc),
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default('base'),
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],
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'base': [
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# Whitespace and Comments
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(r'\n', Whitespace),
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(r'\s+', Whitespace),
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(r'//!.*?\n', String.Doc),
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(r'///(\n|[^/].*?\n)', String.Doc),
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(r'//(.*?)\n', Comment.Single),
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(r'/\*\*(\n|[^/*])', String.Doc, 'doccomment'),
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(r'/\*!', String.Doc, 'doccomment'),
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(r'/\*', Comment.Multiline, 'comment'),
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# Macro parameters
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(r"""\$([a-zA-Z_]\w*|\(,?|\),?|,?)""", Comment.Preproc),
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# Keywords
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(words(('as', 'async', 'await', 'box', 'const', 'crate', 'dyn',
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'else', 'extern', 'for', 'if', 'impl', 'in', 'loop',
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'match', 'move', 'mut', 'pub', 'ref', 'return', 'static',
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'super', 'trait', 'unsafe', 'use', 'where', 'while'),
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suffix=r'\b'), Keyword),
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(words(('abstract', 'become', 'do', 'final', 'macro', 'override',
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'priv', 'typeof', 'try', 'unsized', 'virtual', 'yield'),
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suffix=r'\b'), Keyword.Reserved),
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(r'(true|false)\b', Keyword.Constant),
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(r'self\b', Name.Builtin.Pseudo),
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(r'mod\b', Keyword, 'modname'),
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(r'let\b', Keyword.Declaration),
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(r'fn\b', Keyword, 'funcname'),
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(r'(struct|enum|type|union)\b', Keyword, 'typename'),
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(r'(default)(\s+)(type|fn)\b', bygroups(Keyword, Whitespace, Keyword)),
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keyword_types,
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(r'[sS]elf\b', Name.Builtin.Pseudo),
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# Prelude (taken from Rust's src/libstd/prelude.rs)
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builtin_funcs_types,
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builtin_macros,
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# Path separators, so types don't catch them.
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(r'::\b', Punctuation),
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# Types in positions.
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(r'(?::|->)', Punctuation, 'typename'),
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# Labels
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(r'(break|continue)(\b\s*)(\'[A-Za-z_]\w*)?',
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bygroups(Keyword, Text.Whitespace, Name.Label)),
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# Character literals
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(r"""'(\\['"\\nrt]|\\x[0-7][0-9a-fA-F]|\\0"""
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r"""|\\u\{[0-9a-fA-F]{1,6}\}|.)'""",
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String.Char),
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(r"""b'(\\['"\\nrt]|\\x[0-9a-fA-F]{2}|\\0"""
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r"""|\\u\{[0-9a-fA-F]{1,6}\}|.)'""",
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String.Char),
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# Binary literals
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(r'0b[01_]+', Number.Bin, 'number_lit'),
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# Octal literals
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(r'0o[0-7_]+', Number.Oct, 'number_lit'),
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# Hexadecimal literals
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(r'0[xX][0-9a-fA-F_]+', Number.Hex, 'number_lit'),
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# Decimal literals
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(r'[0-9][0-9_]*(\.[0-9_]+[eE][+\-]?[0-9_]+|'
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r'\.[0-9_]*(?!\.)|[eE][+\-]?[0-9_]+)', Number.Float,
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'number_lit'),
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(r'[0-9][0-9_]*', Number.Integer, 'number_lit'),
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# String literals
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(r'b"', String, 'bytestring'),
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(r'"', String, 'string'),
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(r'(?s)b?r(#*)".*?"\1', String),
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# Lifetime names
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(r"'", Operator, 'lifetime'),
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# Operators and Punctuation
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(r'\.\.=?', Operator),
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(r'[{}()\[\],.;]', Punctuation),
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(r'[+\-*/%&|<>^!~@=:?]', Operator),
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# Identifiers
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(r'[a-zA-Z_]\w*', Name),
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# Raw identifiers
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(r'r#[a-zA-Z_]\w*', Name),
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# Attributes
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(r'#!?\[', Comment.Preproc, 'attribute['),
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# Misc
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# Lone hashes: not used in Rust syntax, but allowed in macro
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# arguments, most famously for quote::quote!()
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(r'#', Punctuation),
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],
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'comment': [
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(r'[^*/]+', Comment.Multiline),
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(r'/\*', Comment.Multiline, '#push'),
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(r'\*/', Comment.Multiline, '#pop'),
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(r'[*/]', Comment.Multiline),
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],
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'doccomment': [
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(r'[^*/]+', String.Doc),
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(r'/\*', String.Doc, '#push'),
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(r'\*/', String.Doc, '#pop'),
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(r'[*/]', String.Doc),
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],
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'modname': [
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(r'\s+', Whitespace),
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(r'[a-zA-Z_]\w*', Name.Namespace, '#pop'),
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default('#pop'),
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],
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'funcname': [
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(r'\s+', Whitespace),
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(r'[a-zA-Z_]\w*', Name.Function, '#pop'),
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default('#pop'),
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],
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'typename': [
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(r'\s+', Whitespace),
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(r'&', Keyword.Pseudo),
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(r"'", Operator, 'lifetime'),
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builtin_funcs_types,
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keyword_types,
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(r'[a-zA-Z_]\w*', Name.Class, '#pop'),
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default('#pop'),
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],
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'lifetime': [
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(r"(static|_)", Name.Builtin),
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(r"[a-zA-Z_]+\w*", Name.Attribute),
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default('#pop'),
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],
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'number_lit': [
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(r'[ui](8|16|32|64|size)', Keyword, '#pop'),
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(r'f(32|64)', Keyword, '#pop'),
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default('#pop'),
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],
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'string': [
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(r'"', String, '#pop'),
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(r"""\\['"\\nrt]|\\x[0-7][0-9a-fA-F]|\\0"""
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r"""|\\u\{[0-9a-fA-F]{1,6}\}""", String.Escape),
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(r'[^\\"]+', String),
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(r'\\', String),
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],
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'bytestring': [
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(r"""\\x[89a-fA-F][0-9a-fA-F]""", String.Escape),
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include('string'),
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],
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'attribute_common': [
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(r'"', String, 'string'),
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(r'\[', Comment.Preproc, 'attribute['),
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],
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'attribute[': [
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include('attribute_common'),
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(r'\]', Comment.Preproc, '#pop'),
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(r'[^"\]\[]+', Comment.Preproc),
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],
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}
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