-- Copyright 2006-2015 Mitchell mitchell.att.foicica.com. See LICENSE. -- C++ LPeg lexer. local l = require('lexer') local token, word_match = l.token, l.word_match local P, R, S = lpeg.P, lpeg.R, lpeg.S local M = {_NAME = 'cpp'} -- Whitespace. local ws = token(l.WHITESPACE, l.space^1) -- Comments. local line_comment = '//' * l.nonnewline_esc^0 local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1 local comment = token(l.COMMENT, line_comment + block_comment) -- Strings. local sq_str = P('L')^-1 * l.delimited_range("'", true) local dq_str = P('L')^-1 * l.delimited_range('"', true) local string = token(l.STRING, sq_str + dq_str) -- Numbers. local number = token(l.NUMBER, l.float + l.integer) -- Preprocessor. local preproc_word = word_match{ 'define', 'elif', 'else', 'endif', 'error', 'if', 'ifdef', 'ifndef', 'import', 'include', 'line', 'pragma', 'undef', 'using', 'warning' } local preproc = token(l.PREPROCESSOR, l.starts_line('#') * S('\t ')^0 * preproc_word) -- Keywords. local keyword = token(l.KEYWORD, word_match{ 'asm', 'auto', 'break', 'case', 'catch', 'class', 'const', 'const_cast', 'continue', 'default', 'delete', 'do', 'dynamic_cast', 'else', 'explicit', 'export', 'extern', 'false', 'for', 'friend', 'goto', 'if', 'inline', 'mutable', 'namespace', 'new', 'operator', 'private', 'protected', 'public', 'register', 'reinterpret_cast', 'return', 'sizeof', 'static', 'static_cast', 'switch', 'template', 'this', 'throw', 'true', 'try', 'typedef', 'typeid', 'typename', 'using', 'virtual', 'volatile', 'while', -- Operators 'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not', 'not_eq', 'or', 'or_eq', 'xor', 'xor_eq', -- C++11 'alignas', 'alignof', 'constexpr', 'decltype', 'final', 'noexcept', 'override', 'static_assert', 'thread_local' }) -- Types. local type = token(l.TYPE, word_match{ 'bool', 'char', 'double', 'enum', 'float', 'int', 'long', 'short', 'signed', 'struct', 'union', 'unsigned', 'void', 'wchar_t', -- C++11 'char16_t', 'char32_t', 'nullptr' }) -- Identifiers. local identifier = token(l.IDENTIFIER, l.word) -- Operators. local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;,.()[]{}')) M._rules = { {'whitespace', ws}, {'keyword', keyword}, {'type', type}, {'identifier', identifier}, {'string', string}, {'comment', comment}, {'number', number}, {'preproc', preproc}, {'operator', operator}, } M._foldsymbols = { _patterns = {'%l+', '[{}]', '/%*', '%*/', '//'}, [l.PREPROCESSOR] = { region = 1, endregion = -1, ['if'] = 1, ifdef = 1, ifndef = 1, endif = -1 }, [l.OPERATOR] = {['{'] = 1, ['}'] = -1}, [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')} } return M