-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Vala 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('vala')
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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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class delegate enum errordomain interface namespace signal struct using
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-- Modifiers.
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abstract const dynamic extern inline out override private protected public ref
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static virtual volatile weak
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-- Other.
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as base break case catch construct continue default delete do else ensures
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finally for foreach get if in is lock new requires return set sizeof switch
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this throw throws try typeof value var void while
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-- Etc.
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null true false
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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 char double float int int8 int16 int32 int64 long short size_t ssize_t
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string uchar uint uint8 uint16 uint32 uint64 ulong unichar ushort
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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 tq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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local ml_str = '@' * lexer.delimited_range('"', false, true)
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lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str + ml_str))
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-- Comments.
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local line_comment = '//' * lexer.nonnewline_esc^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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S('uUlLfFdDmM')^-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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