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# -*- coding: utf-8 -*-
"""
pygments.lexers.rust
~~~~~~~~~~~~~~~~~~~~
Lexers for the Rust language.
:copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.lexer import RegexLexer, include, bygroups, words, default
from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
Number, Punctuation, Whitespace
__all__ = ['RustLexer']
class RustLexer(RegexLexer):
"""
Lexer for the Rust programming language (version 1.0).
.. versionadded:: 1.6
"""
name = 'Rust'
filenames = ['*.rs']
aliases = ['rust']
mimetypes = ['text/rust']
tokens = {
'root': [
# rust allows a file to start with a shebang, but if the first line
# starts with #![ then it’s not a shebang but a crate attribute.
(r'#![^[\r\n].*$', Comment.Preproc),
default('base'),
],
'base': [
# Whitespace and Comments
(r'\n', Whitespace),
(r'\s+', Whitespace),
(r'//!.*?\n', String.Doc),
(r'///(\n|[^/].*?\n)', String.Doc),
(r'//(.*?)\n', Comment.Single),
(r'/\*\*(\n|[^/*])', String.Doc, 'doccomment'),
(r'/\*!', String.Doc, 'doccomment'),
(r'/\*', Comment.Multiline, 'comment'),
# Macro parameters
(r"""\$([a-zA-Z_]\w*|\(,?|\),?|,?)""", Comment.Preproc),
# Keywords
(words((
'as', 'box', 'crate', 'do', 'else', 'enum', 'extern', # break and continue are in labels
'fn', 'for', 'if', 'impl', 'in', 'loop', 'match', 'mut', 'priv',
'proc', 'pub', 'ref', 'return', 'static', 'struct',
'trait', 'true', 'type', 'unsafe', 'while'), suffix=r'\b'),
Keyword),
(words(('alignof', 'be', 'const', 'offsetof', 'pure', 'sizeof',
'typeof', 'once', 'unsized', 'yield'), suffix=r'\b'),
Keyword.Reserved),
(r'(mod|use)\b', Keyword.Namespace),
(r'(true|false)\b', Keyword.Constant),
(r'let\b', Keyword.Declaration),
(words(('u8', 'u16', 'u32', 'u64', 'i8', 'i16', 'i32', 'i64', 'usize',
'isize', 'f32', 'f64', 'str', 'bool'), suffix=r'\b'),
Keyword.Type),
(r'self\b', Name.Builtin.Pseudo),
# Prelude (taken from Rust’s src/libstd/prelude.rs)
(words((
# Reexported core operators
'Copy', 'Send', 'Sized', 'Sync',
'Drop', 'Fn', 'FnMut', 'FnOnce',
# Reexported functions
'drop',
# Reexported types and traits
'Box',
'ToOwned',
'Clone',
'PartialEq', 'PartialOrd', 'Eq', 'Ord',
'AsRef', 'AsMut', 'Into', 'From',
'Default',
'Iterator', 'Extend', 'IntoIterator',
'DoubleEndedIterator', 'ExactSizeIterator',
'Option',
'Some', 'None',
'Result',
'Ok', 'Err',
'SliceConcatExt',
'String', 'ToString',
'Vec',
), suffix=r'\b'),
Name.Builtin),
# Labels
(r'(break|continue)(\s*)(\'[A-Za-z_]\w*)?', bygroups(Keyword, Text.Whitespace, Name.Label)),
# Character Literal
(r"""'(\\['"\\nrt]|\\x[0-7][0-9a-fA-F]|\\0"""
r"""|\\u\{[0-9a-fA-F]{1,6}\}|.)'""",
String.Char),
(r"""b'(\\['"\\nrt]|\\x[0-9a-fA-F]{2}|\\0"""
r"""|\\u\{[0-9a-fA-F]{1,6}\}|.)'""",
String.Char),
# Binary Literal
(r'0b[01_]+', Number.Bin, 'number_lit'),
# Octal Literal
(r'0o[0-7_]+', Number.Oct, 'number_lit'),
# Hexadecimal Literal
(r'0[xX][0-9a-fA-F_]+', Number.Hex, 'number_lit'),
# Decimal Literal
(r'[0-9][0-9_]*(\.[0-9_]+[eE][+\-]?[0-9_]+|'
r'\.[0-9_]*(?!\.)|[eE][+\-]?[0-9_]+)', Number.Float, 'number_lit'),
(r'[0-9][0-9_]*', Number.Integer, 'number_lit'),
# String Literal
(r'b"', String, 'bytestring'),
(r'"', String, 'string'),
(r'b?r(#*)".*?"\1', String),
# Lifetime
(r"""'static""", Name.Builtin),
(r"""'[a-zA-Z_]\w*""", Name.Attribute),
# Operators and Punctuation
(r'[{}()\[\],.;]', Punctuation),
(r'[+\-*/%&|<>^!~@=:?]', Operator),
# Identifier
(r'[a-zA-Z_]\w*', Name),
# Attributes
(r'#!?\[', Comment.Preproc, 'attribute['),
# Macros
(r'([A-Za-z_]\w*)(!)(\s*)([A-Za-z_]\w*)?(\s*)(\{)',
bygroups(Comment.Preproc, Punctuation, Whitespace, Name,
Whitespace, Punctuation), 'macro{'),
(r'([A-Za-z_]\w*)(!)(\s*)([A-Za-z_]\w*)?(\()',
bygroups(Comment.Preproc, Punctuation, Whitespace, Name,
Punctuation), 'macro('),
],
'comment': [
(r'[^*/]+', Comment.Multiline),
(r'/\*', Comment.Multiline, '#push'),
(r'\*/', Comment.Multiline, '#pop'),
(r'[*/]', Comment.Multiline),
],
'doccomment': [
(r'[^*/]+', String.Doc),
(r'/\*', String.Doc, '#push'),
(r'\*/', String.Doc, '#pop'),
(r'[*/]', String.Doc),
],
'number_lit': [
(r'[ui](8|16|32|64|size)', Keyword, '#pop'),
(r'f(32|64)', Keyword, '#pop'),
default('#pop'),
],
'string': [
(r'"', String, '#pop'),
(r"""\\['"\\nrt]|\\x[0-7][0-9a-fA-F]|\\0"""
r"""|\\u\{[0-9a-fA-F]{1,6}\}""", String.Escape),
(r'[^\\"]+', String),
(r'\\', String),
],
'bytestring': [
(r"""\\x[89a-fA-F][0-9a-fA-F]""", String.Escape),
include('string'),
],
'macro{': [
(r'\{', Operator, '#push'),
(r'\}', Operator, '#pop'),
],
'macro(': [
(r'\(', Operator, '#push'),
(r'\)', Operator, '#pop'),
],
'attribute_common': [
(r'"', String, 'string'),
(r'\[', Comment.Preproc, 'attribute['),
(r'\(', Comment.Preproc, 'attribute('),
],
'attribute[': [
include('attribute_common'),
(r'\];?', Comment.Preproc, '#pop'),
(r'[^"\]]+', Comment.Preproc),
],
'attribute(': [
include('attribute_common'),
(r'\);?', Comment.Preproc, '#pop'),
(r'[^")]+', Comment.Preproc),
],
}
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