vis

a vi-like editor based on Plan 9's structural regular expressions
protobuf.lua

(1571B)
      1 -- Copyright 2016-2025 David B. Lamkins <david@lamkins.net>. See LICENSE.
      2 -- Protocol Buffer IDL LPeg lexer.
      3 -- <https://developers.google.com/protocol-buffers/>
      4 
      5 local lexer = require('lexer')
      6 local token, word_match = lexer.token, lexer.word_match
      7 local P, S = lpeg.P, lpeg.S
      8 
      9 local lex = lexer.new('protobuf')
     10 
     11 -- Whitespace.
     12 lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
     13 
     14 -- Keywords.
     15 lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
     16 	'contained', 'syntax', 'import', 'option', 'package', 'message', 'group', 'oneof', 'optional',
     17 	'required', 'repeated', 'default', 'extend', 'extensions', 'to', 'max', 'reserved', 'service',
     18 	'rpc', 'returns'
     19 }))
     20 
     21 -- Types.
     22 lex:add_rule('type', token(lexer.TYPE, word_match{
     23 	'int32', 'int64', 'uint32', 'uint64', 'sint32', 'sint64', 'fixed32', 'fixed64', 'sfixed32',
     24 	'sfixed64', 'float', 'double', 'bool', 'string', 'bytes', 'enum', 'true', 'false'
     25 }))
     26 
     27 -- Strings.
     28 local sq_str = P('L')^-1 * lexer.range("'", true)
     29 local dq_str = P('L')^-1 * lexer.range('"', true)
     30 lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
     31 
     32 -- Identifiers.
     33 lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
     34 
     35 -- Comments.
     36 local line_comment = lexer.to_eol('//', true)
     37 local block_comment = lexer.range('/*', '*/')
     38 lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
     39 
     40 -- Numbers.
     41 lex:add_rule('number', token(lexer.NUMBER, lexer.number))
     42 
     43 -- Operators.
     44 lex:add_rule('operator', token(lexer.OPERATOR, S('<>=|;,.()[]{}')))
     45 
     46 lexer.property['scintillua.comment'] = '//'
     47 
     48 return lex