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# protobuf_parser.py
#
# simple parser for parsing protobuf .proto files
#
# Copyright 2010, Paul McGuire
#
from pyparsing import (
Word,
alphas,
alphanums,
Regex,
Suppress,
Forward,
Group,
one_of,
Opt,
DelimitedList,
rest_of_line,
quotedString,
Dict,
Keyword,
)
ident = Word(alphas + "_", alphanums + "_").set_name("identifier")
integer = Regex(r"[+-]?\d+")
LBRACE, RBRACE, LBRACK, RBRACK, LPAR, RPAR, EQ, SEMI = Suppress.using_each("{}[]()=;")
kwds = """message required optional repeated enum extensions extends extend
to package service rpc returns true false option import syntax"""
for kw in kwds.split():
exec("{}_ = Keyword('{}')".format(kw.upper(), kw))
messageBody = Forward()
messageDefn = MESSAGE_ - ident("messageId") + LBRACE + messageBody("body") + RBRACE
typespec = (
one_of(
"double float int32 int64 uint32 uint64 sint32 sint64"
" fixed32 fixed64 sfixed32 sfixed64 bool string bytes"
)
| ident
)
rvalue = integer | TRUE_ | FALSE_ | ident
fieldDirective = LBRACK + Group(ident + EQ + rvalue) + RBRACK
fieldDefnPrefix = REQUIRED_ | OPTIONAL_ | REPEATED_
fieldDefn = (
Opt(fieldDefnPrefix)
+ typespec("typespec")
+ ident("ident")
+ EQ
+ integer("fieldint")
+ fieldDirective[...]
+ SEMI
)
# enumDefn ::= 'enum' ident '{' { ident '=' integer ';' }* '}'
enumDefn = (
ENUM_("typespec")
- ident("name")
+ LBRACE
+ Dict((Group(ident + EQ + integer + SEMI))[...])("values")
+ RBRACE
)
# extensionsDefn ::= 'extensions' integer 'to' integer ';'
extensionsDefn = EXTENSIONS_ - integer + TO_ + integer + SEMI
# messageExtension ::= 'extend' ident '{' messageBody '}'
messageExtension = EXTEND_ - ident + LBRACE + messageBody + RBRACE
# messageBody ::= { fieldDefn | enumDefn | messageDefn | extensionsDefn | messageExtension }*
messageBody <<= Group(
Group(
fieldDefn | enumDefn | messageDefn | extensionsDefn | messageExtension
)[...]
)
# methodDefn ::= 'rpc' ident '(' [ ident ] ')' 'returns' '(' [ ident ] ')' ';'
methodDefn = (
RPC_
- ident("methodName")
+ LPAR
+ Opt(ident("methodParam"))
+ RPAR
+ RETURNS_
+ LPAR
+ Opt(ident("methodReturn"))
+ RPAR
)
# serviceDefn ::= 'service' ident '{' methodDefn* '}'
serviceDefn = (
SERVICE_ - ident("serviceName") + LBRACE + Group(methodDefn)[...] + RBRACE
)
syntaxDefn = SYNTAX_ + EQ - quotedString("syntaxString") + SEMI
# packageDirective ::= 'package' ident [ '.' ident]* ';'
packageDirective = Group(PACKAGE_ - DelimitedList(ident, ".", combine=True) + SEMI)
comment = "//" + rest_of_line
importDirective = IMPORT_ - quotedString("importFileSpec") + SEMI
optionDirective = (
OPTION_ - ident("optionName") + EQ + quotedString("optionValue") + SEMI
)
topLevelStatement = Group(
messageDefn
| messageExtension
| enumDefn
| serviceDefn
| importDirective
| optionDirective
| syntaxDefn
)
parser = Opt(packageDirective) + topLevelStatement[...]
parser.ignore(comment)
if __name__ == "__main__":
test1 = """message Person {
required int32 id = 1;
required string name = 2;
optional string email = 3;
}"""
test2 = """package tutorial;
message Person {
required string name = 1;
required int32 id = 2;
optional string email = 3;
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
message PhoneNumber {
required string number = 1;
optional PhoneType type = 2 [default = HOME];
}
repeated PhoneNumber phone = 4;
}
message AddressBook {
repeated Person person = 1;
}"""
test3 = """syntax = "proto3";
import "test.proto";
message SearchRequest {
string query = 1;
int32 page_number = 2;
int32 result_per_page = 3;
}
"""
parser.run_tests([test1, test2, test3])