protobuf.lua (1576B)
- -- Copyright 2016-2024 David B. Lamkins <david@lamkins.net>. See LICENSE.
- -- Protocol Buffer IDL LPeg lexer.
- -- <https://developers.google.com/protocol-buffers/>
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('protobuf')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'contained', 'syntax', 'import', 'option', 'package', 'message', 'group', 'oneof', 'optional',
- 'required', 'repeated', 'default', 'extend', 'extensions', 'to', 'max', 'reserved', 'service',
- 'rpc', 'returns'
- }))
- -- Types.
- lex:add_rule('type', token(lexer.TYPE, word_match{
- 'int32', 'int64', 'uint32', 'uint64', 'sint32', 'sint64', 'fixed32', 'fixed64', 'sfixed32',
- 'sfixed64', 'float', 'double', 'bool', 'string', 'bytes', 'enum', 'true', 'false'
- }))
- -- Strings.
- local sq_str = P('L')^-1 * lexer.range("'", true)
- local dq_str = P('L')^-1 * lexer.range('"', true)
- lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Comments.
- local line_comment = lexer.to_eol('//', true)
- 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('<>=|;,.()[]{}')))
- lexer.property['scintillua.comment'] = '//'
- return lex