faust.lua (1511B)
- -- Copyright 2015-2024 David B. Lamkins <david@lamkins.net>. See LICENSE.
- -- Faust LPeg lexer, see http://faust.grame.fr/
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('faust')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'declare', 'import', 'mdoctags', 'dependencies', 'distributed', 'inputs', 'outputs', 'par', 'seq',
- 'sum', 'prod', 'xor', 'with', 'environment', 'library', 'component', 'ffunction', 'fvariable',
- 'fconstant', 'int', 'float', 'case', 'waveform', 'h:', 'v:', 't:'
- }))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Strings.
- lex:add_rule('string', token(lexer.STRING, lexer.range('"', true)))
- -- Comments.
- local line_comment = lexer.to_eol('//')
- local block_comment = lexer.range('/*', '*/')
- lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
- -- Numbers.
- local int = lexer.digit^1
- local rad = P('.')
- local exp = (P('e') * S('+-')^-1 * int)^-1
- local flt = int * (rad * int)^-1 * exp + int^-1 * rad * int * exp
- lex:add_rule('number', token(lexer.NUMBER, flt + int))
- -- Pragmas.
- lex:add_rule('pragma', token(lexer.PREPROCESSOR, lexer.range('<mdoc>', '</mdoc>')))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>~!=^&|?~:;,.()[]{}@#$`\\\'')))
- lexer.property['scintillua.comment'] = '//'
- return lex