io_lang.lua (1542B)
- -- Copyright 2006-2024 Mitchell. See LICENSE.
- -- Io 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('io_lang')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'block', 'method', 'while', 'foreach', 'if', 'else', 'do', 'super', 'self', 'clone', 'proto',
- 'setSlot', 'hasSlot', 'type', 'write', 'print', 'forward'
- }))
- -- Types.
- lex:add_rule('type', token(lexer.TYPE, word_match{
- 'Block', 'Buffer', 'CFunction', 'Date', 'Duration', 'File', 'Future', 'LinkedList', 'List', 'Map',
- 'Message', 'Nil', 'Nop', 'Number', 'Object', 'String', 'WeakLink'
- }))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Strings.
- local sq_str = lexer.range("'")
- local dq_str = lexer.range('"')
- local tq_str = lexer.range('"""')
- lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str))
- -- Comments.
- local line_comment = lexer.to_eol(P('#') + '//')
- local block_comment = lexer.range('/*', '*/')
- lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
- -- Numbers.
- lex:add_rule('number', token(lexer.NUMBER, lexer.number))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('`~@$%^&*-+/=\\<>?.,:;()[]{}')))
- -- Fold points.
- lex:add_fold_point(lexer.OPERATOR, '(', ')')
- lex:add_fold_point(lexer.COMMENT, '/*', '*/')
- lexer.property['scintillua.comment'] = '#'
- return lex