58 lines
2.0 KiB
Lua
58 lines
2.0 KiB
Lua
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-- Copyright 2013-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Dart LPeg lexer.
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-- Written by Brian Schott (@Hackerpilot on Github).
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('dart')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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assert break case catch class const continue default do else enum extends
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false final finally for if in is new null rethrow return super switch this
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throw true try var void while with
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]]))
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-- Built-ins.
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lex:add_rule('builtin', token(lexer.CONSTANT, word_match[[
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abstract as dynamic export external factory get implements import library
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operator part set static typedef
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]]))
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-- Strings.
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local sq_str = S('r')^-1 * lexer.delimited_range("'", true)
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local dq_str = S('r')^-1 * lexer.delimited_range('"', true)
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local sq_str_multiline = S('r')^-1 * "'''" * (lexer.any - "'''")^0 * P("'''")^-1
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local dq_str_multiline = S('r')^-1 * '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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lex:add_rule('string', token(lexer.STRING, sq_str_multiline + dq_str_multiline +
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sq_str + dq_str))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline_esc^0 +
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lexer.nested_pair('/*', '*/')))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.hex_num))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('#?=!<>+-*$/%&|^~.,;()[]{}')))
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-- Annotations.
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lex:add_rule('annotation', token('annotation', '@' * lexer.word^1))
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lex:add_style('annotation', lexer.STYLE_PREPROCESSOR)
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-- Fold points.
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '/*', '*/')
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lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
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return lex
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