63 lines
1.9 KiB
Lua
63 lines
1.9 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Go LPeg lexer.
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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('go')
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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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break case chan const continue default defer else fallthrough for func go goto
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if import interface map package range return select struct switch type var
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]]))
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-- Constants.
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lex:add_rule('constant', token(lexer.CONSTANT, word_match[[
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true false iota nil
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]]))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match[[
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bool byte complex64 complex128 error float32 float64 int int8 int16 int32
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int64 rune string uint uint8 uint16 uint32 uint64 uintptr
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]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match[[
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append cap close complex copy delete imag len make new panic print println
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real recover
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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local sq_str = lexer.delimited_range("'", true)
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local dq_str = lexer.delimited_range('"', true)
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local raw_str = lexer.delimited_range('`', false, true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + raw_str))
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-- Comments.
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local line_comment = '//' * lexer.nonnewline^0
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local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
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P('i')^-1))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('+-*/%&|^<>=!:;.,()[]{}')))
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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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