ps.lua (1550B)
- -- Copyright 2006-2024 Mitchell. See LICENSE.
- -- Postscript 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('ps')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'pop', 'exch', 'dup', 'copy', 'roll', 'clear', 'count', 'mark', 'cleartomark', 'counttomark',
- 'exec', 'if', 'ifelse', 'for', 'repeat', 'loop', 'exit', 'stop', 'stopped', 'countexecstack',
- 'execstack', 'quit', 'start', 'true', 'false', 'NULL'
- }))
- -- Functions.
- lex:add_rule('function', token(lexer.FUNCTION, word_match{
- 'add', 'div', 'idiv', 'mod', 'mul', 'sub', 'abs', 'ned', 'ceiling', 'floor', 'round', 'truncate',
- 'sqrt', 'atan', 'cos', 'sin', 'exp', 'ln', 'log', 'rand', 'srand', 'rrand'
- }))
- -- Identifiers.
- local word = (lexer.alpha + '-') * (lexer.alnum + '-')^0
- lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
- -- Strings.
- local arrow_string = lexer.range('<', '>')
- local nested_string = lexer.range('(', ')', false, false, true)
- lex:add_rule('string', token(lexer.STRING, arrow_string + nested_string))
- -- Comments.
- lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('%')))
- -- Numbers.
- lex:add_rule('number', token(lexer.NUMBER, lexer.number))
- -- Labels.
- lex:add_rule('label', token(lexer.LABEL, '/' * word))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('[]{}')))
- lexer.property['scintillua.comment'] = '%'
- return lex