46 lines
1.5 KiB
Lua
46 lines
1.5 KiB
Lua
|
-- Copyright 2016-2019 David B. Lamkins <david@lamkins.net>. See License.txt.
|
||
|
|
-- 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, R, S = lpeg.P, lpeg.R, 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.delimited_range("'", true)
|
||
|
|
local dq_str = P('L')^-1 * lexer.delimited_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.nonnewline_esc^0
|
||
|
|
local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
|
||
|
|
lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
|
||
|
|
|
||
|
|
-- Numbers.
|
||
|
|
lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
|
||
|
|
|
||
|
|
-- Operators.
|
||
|
|
lex:add_rule('operator', token(lexer.OPERATOR, S('<>=|;,.()[]{}')))
|
||
|
|
|
||
|
|
return lex
|