myrddin.lua (1838B)
- -- Copyright 2017-2024 Michael Forney. See LICENSE
- -- Myrddin LPeg lexer.
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('myrddin')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'break', 'const', 'continue', 'elif', 'else', 'extern', 'false', 'for', 'generic', 'goto', 'if',
- 'impl', 'in', 'match', 'pkg', 'pkglocal', 'sizeof', 'struct', 'trait', 'true', 'type', 'union',
- 'use', 'var', 'while'
- }))
- -- Types.
- lex:add_rule('type', token(lexer.TYPE, word_match{
- 'void', 'bool', 'char', 'byte', 'int', 'uint', 'int8', 'uint8', 'int16', 'uint16', 'int32',
- 'uint32', 'int64', 'uint64', 'flt32', 'flt64'
- } + '@' * lexer.word))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Comments.
- local line_comment = lexer.to_eol('//', true)
- local block_comment = lexer.range('/*', '*/', false, false, true)
- lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
- -- Strings.
- local sq_str = lexer.range("'", true)
- local dq_str = lexer.range('"', true)
- lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
- -- Numbers.
- local digit = lexer.digit + '_'
- local bdigit = S('01') + '_'
- local xdigit = lexer.xdigit + '_'
- local odigit = lpeg.R('07') + '_'
- local integer = '0x' * xdigit^1 + '0o' * odigit^1 + '0b' * bdigit^1 + digit^1
- local float = digit^1 * ((('.' * digit^1) * (S('eE') * S('+-')^-1 * digit^1)^-1) +
- (('.' * digit^1)^-1 * S('eE') * S('+-')^-1 * digit^1))
- lex:add_rule('number', token(lexer.NUMBER, float + integer))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('`#_+-/*%<>~!=^&|~:;,.()[]{}')))
- lexer.property['scintillua.comment'] = '//'
- return lex