-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- C++ 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('cpp')
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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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asm auto break case catch class const const_cast continue default delete do
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dynamic_cast else explicit export extern false for friend goto if inline
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mutable namespace new operator private protected public register
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reinterpret_cast return sizeof static static_cast switch template this throw
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true try typedef typeid typename using virtual volatile while
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-- Operators.
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and and_eq bitand bitor compl not not_eq or or_eq xor xor_eq
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-- C++11.
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alignas alignof constexpr decltype final noexcept override static_assert
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thread_local
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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 enum float int long short signed struct union unsigned void
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wchar_t
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-- C++11.
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char16_t char32_t nullptr
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]]))
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-- Strings.
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local sq_str = P('L')^-1 * lexer.delimited_range("'", true)
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local dq_str = P('L')^-1 * lexer.delimited_range('"', true)
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lex:add_rule('string', token(lexer.STRING, 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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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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-- Preprocessor.
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local preproc_word = word_match[[
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define elif else endif error if ifdef ifndef import line pragma undef using
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warning
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]]
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lex:add_rule('preprocessor',
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#lexer.starts_line('#') *
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(token(lexer.PREPROCESSOR, '#' * S('\t ')^0 * preproc_word) +
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token(lexer.PREPROCESSOR, '#' * S('\t ')^0 * 'include') *
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(token(lexer.WHITESPACE, S('\t ')^1) *
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token(lexer.STRING,
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lexer.delimited_range('<>', true, true)))^-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.PREPROCESSOR, 'if', 'endif')
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lex:add_fold_point(lexer.PREPROCESSOR, 'ifdef', 'endif')
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lex:add_fold_point(lexer.PREPROCESSOR, 'ifndef', 'endif')
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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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