dart.lua (1899B)
- -- Copyright 2013-2024 Mitchell. See LICENSE.
- -- Dart LPeg lexer.
- -- Written by Brian Schott (@Hackerpilot on Github).
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('dart')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'assert', 'break', 'case', 'catch', 'class', 'const', 'continue', 'default', 'do', 'else', 'enum',
- 'extends', 'false', 'final', 'finally', 'for', 'if', 'in', 'is', 'new', 'null', 'rethrow',
- 'return', 'super', 'switch', 'this', 'throw', 'true', 'try', 'var', 'void', 'while', 'with'
- }))
- -- Built-ins.
- lex:add_rule('builtin', token(lexer.CONSTANT, word_match{
- 'abstract', 'as', 'dynamic', 'export', 'external', 'factory', 'get', 'implements', 'import',
- 'library', 'operator', 'part', 'set', 'static', 'typedef'
- }))
- -- Strings.
- local sq_str = S('r')^-1 * lexer.range("'", true)
- local dq_str = S('r')^-1 * lexer.range('"', true)
- local tq_str = S('r')^-1 * (lexer.range("'''") + lexer.range('"""'))
- lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Comments.
- local line_comment = lexer.to_eol('//', true)
- local block_comment = lexer.range('/*', '*/', false, false, true)
- lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
- -- Numbers.
- lex:add_rule('number', token(lexer.NUMBER, lexer.number))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}')))
- -- Annotations.
- lex:add_rule('annotation', token(lexer.ANNOTATION, '@' * lexer.word^1))
- -- Fold points.
- lex:add_fold_point(lexer.OPERATOR, '{', '}')
- lex:add_fold_point(lexer.COMMENT, '/*', '*/')
- lexer.property['scintillua.comment'] = '//'
- return lex