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parser.py
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parser.py
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__author__ = "Dusan (Ph4r05) Klinec"
__copyright__ = "Copyright (C) 2014 Dusan (ph4r05) Klinec"
__license__ = "Apache License, Version 2.0"
__version__ = "1.0"
import ply.lex as lex
import ply.yacc as yacc
from .model import *
class ProtobufLexer(object):
keywords = ('double', 'float', 'int32', 'int64', 'uint32', 'uint64', 'sint32', 'sint64',
'fixed32', 'fixed64', 'sfixed32', 'sfixed64', 'bool', 'string', 'bytes',
'message', 'required', 'optional', 'repeated', 'enum', 'extensions', 'max', 'extends', 'extend',
'to', 'package', 'service', 'rpc', 'returns', 'true', 'false', 'option', 'import')
tokens = [
'NAME',
'NUM',
'STRING_LITERAL',
'LINE_COMMENT', 'BLOCK_COMMENT',
'LBRACE', 'RBRACE', 'LBRACK', 'RBRACK',
'LPAR', 'RPAR', 'EQ', 'SEMI', 'DOT',
'STARTTOKEN'
] + [k.upper() for k in keywords]
literals = '()+-*/=?:,.^|&~!=[]{};<>@%'
t_NUM = r'[+-]?\d+'
t_STRING_LITERAL = r'\"([^\\\n]|(\\.))*?\"'
t_ignore_LINE_COMMENT = '//.*'
def t_BLOCK_COMMENT(self, t):
r'/\*(.|\n)*?\*/'
t.lexer.lineno += t.value.count('\n')
t_LBRACE = '{'
t_RBRACE = '}'
t_LBRACK = '\\['
t_RBRACK = '\\]'
t_LPAR = '\\('
t_RPAR = '\\)'
t_EQ = '='
t_SEMI = ';'
t_DOT = '\\.'
t_ignore = ' \t\f'
t_STARTTOKEN = '\\+'
def t_NAME(self, t):
'[A-Za-z_$][A-Za-z0-9_$]*'
if t.value in ProtobufLexer.keywords:
#print "type: %s val %s t %s" % (t.type, t.value, t)
t.type = t.value.upper()
return t
def t_newline(self, t):
r'\n+'
t.lexer.lineno += len(t.value)
def t_newline2(self, t):
r'(\r\n)+'
t.lexer.lineno += len(t.value) / 2
def t_error(self, t):
print("Illegal character '{}' ({}) in line {}".format(t.value[0], hex(ord(t.value[0])), t.lexer.lineno))
t.lexer.skip(1)
class LexHelper:
offset = 0
def get_max_linespan(self, p):
defSpan=[1e60, -1]
mSpan=[1e60, -1]
for sp in range(0, len(p)):
csp = p.linespan(sp)
if csp[0] == 0 and csp[1] == 0:
if hasattr(p[sp], "linespan"):
csp = p[sp].linespan
else:
continue
if csp == None or len(csp) != 2: continue
if csp[0] == 0 and csp[1] == 0: continue
if csp[0] < mSpan[0]: mSpan[0] = csp[0]
if csp[1] > mSpan[1]: mSpan[1] = csp[1]
if defSpan == mSpan: return (0,0)
return tuple([mSpan[0]-self.offset, mSpan[1]-self.offset])
def get_max_lexspan(self, p):
defSpan=[1e60, -1]
mSpan=[1e60, -1]
for sp in range(0, len(p)):
csp = p.lexspan(sp)
if csp[0] == 0 and csp[1] == 0:
if hasattr(p[sp], "lexspan"):
csp = p[sp].lexspan
else:
continue
if csp == None or len(csp) != 2: continue
if csp[0] == 0 and csp[1] == 0: continue
if csp[0] < mSpan[0]: mSpan[0] = csp[0]
if csp[1] > mSpan[1]: mSpan[1] = csp[1]
if defSpan == mSpan: return (0,0)
return tuple([mSpan[0]-self.offset, mSpan[1]-self.offset])
def set_parse_object(self, dst, p):
dst.setLexData(linespan=self.get_max_linespan(p), lexspan=self.get_max_lexspan(p))
dst.setLexObj(p)
class ProtobufParser(object):
tokens = ProtobufLexer.tokens
offset = 0
lh = LexHelper()
def setOffset(self, of):
self.offset = of
self.lh.offset = of
def p_empty(self, p):
'''empty :'''
pass
def p_field_modifier(self,p):
'''field_modifier : REQUIRED
| OPTIONAL
| REPEATED'''
p[0] = LU.i(p,1)
def p_primitive_type(self, p):
'''primitive_type : DOUBLE
| FLOAT
| INT32
| INT64
| UINT32
| UINT64
| SINT32
| SINT64
| FIXED32
| FIXED64
| SFIXED32
| SFIXED64
| BOOL
| STRING
| BYTES'''
p[0] = LU.i(p,1)
def p_field_id(self, p):
'''field_id : NUM'''
p[0] = LU.i(p,1)
def p_rvalue(self, p):
'''rvalue : NUM
| TRUE
| FALSE'''
p[0] = LU.i(p,1)
def p_rvalue2(self, p):
'''rvalue : NAME'''
p[0] = Name(LU.i(p, 1))
self.lh.set_parse_object(p[0], p)
p[0].deriveLex()
def p_field_directive(self, p):
'''field_directive : LBRACK NAME EQ rvalue RBRACK'''
p[0] = FieldDirective(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
def p_field_directive_times(self, p):
'''field_directive_times : field_directive_plus'''
p[0] = p[1]
def p_field_directive_times2(self, p):
'''field_directive_times : empty'''
p[0] = []
def p_field_directive_plus(self, p):
'''field_directive_plus : field_directive
| field_directive_plus field_directive'''
if len(p) == 2:
p[0] = [LU(p,1)]
else:
p[0] = p[1] + [LU(p,2)]
def p_dotname(self, p):
'''dotname : NAME
| dotname DOT NAME'''
if len(p) == 2:
p[0] = [LU(p,1)]
else:
p[0] = p[1] + [LU(p,3)]
# Hack for cases when there is a field named 'message' or 'max'
def p_fieldName(self, p):
'''field_name : NAME
| MESSAGE
| MAX'''
p[0] = Name(LU.i(p,1))
self.lh.set_parse_object(p[0], p)
p[0].deriveLex()
def p_field_type(self, p):
'''field_type : primitive_type'''
p[0] = FieldType(LU.i(p,1))
self.lh.set_parse_object(p[0], p)
def p_field_type2(self, p):
'''field_type : dotname'''
p[0] = DotName(LU.i(p, 1))
self.lh.set_parse_object(p[0], p)
p[0].deriveLex()
# Root of the field declaration.
def p_field_definition(self, p):
'''field_definition : field_modifier field_type field_name EQ field_id field_directive_times SEMI'''
p[0] = FieldDefinition(LU.i(p,1), LU.i(p,2), LU.i(p, 3), LU.i(p,5), LU.i(p,6))
self.lh.set_parse_object(p[0], p)
# Root of the enum field declaration.
def p_enum_field(self, p):
'''enum_field : field_name EQ NUM SEMI'''
p[0] = EnumFieldDefinition(LU.i(p, 1), LU.i(p,3))
self.lh.set_parse_object(p[0], p)
def p_enum_body_part(self, p):
'''enum_body_part : enum_field
| option_directive'''
p[0] = p[1]
def p_enum_body(self, p):
'''enum_body : enum_body_part
| enum_body enum_body_part'''
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
def p_enum_body_opt(self, p):
'''enum_body_opt : empty'''
p[0] = []
def p_enum_body_opt2(self, p):
'''enum_body_opt : enum_body'''
p[0] = p[1]
# Root of the enum declaration.
# enum_definition ::= 'enum' ident '{' { ident '=' integer ';' }* '}'
def p_enum_definition(self, p):
'''enum_definition : ENUM NAME LBRACE enum_body_opt RBRACE'''
p[0] = EnumDefinition(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
def p_extensions_to(self, p):
'''extensions_to : MAX'''
p[0] = ExtensionsMax()
self.lh.set_parse_object(p[0], p)
def p_extensions_to2(self, p):
'''extensions_to : NUM'''
p[0] = LU.i(p, 1)
# extensions_definition ::= 'extensions' integer 'to' integer ';'
def p_extensions_definition(self, p):
'''extensions_definition : EXTENSIONS NUM TO extensions_to SEMI'''
p[0] = ExtensionsDirective(LU.i(p,2), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
# message_extension ::= 'extend' ident '{' message_body '}'
def p_message_extension(self, p):
'''message_extension : EXTEND NAME LBRACE message_body RBRACE'''
p[0] = MessageExtension(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
def p_message_body_part(self, p):
'''message_body_part : field_definition
| enum_definition
| message_definition
| extensions_definition
| message_extension'''
p[0] = p[1]
# message_body ::= { field_definition | enum_definition | message_definition | extensions_definition | message_extension }*
def p_message_body(self, p):
'''message_body : empty'''
p[0] = []
# message_body ::= { field_definition | enum_definition | message_definition | extensions_definition | message_extension }*
def p_message_body2(self, p):
'''message_body : message_body_part
| message_body message_body_part'''
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
# Root of the message declaration.
# message_definition = MESSAGE_ - ident("messageId") + LBRACE + message_body("body") + RBRACE
def p_message_definition(self, p):
'''message_definition : MESSAGE NAME LBRACE message_body RBRACE'''
p[0] = MessageDefinition(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
# method_definition ::= 'rpc' ident '(' [ ident ] ')' 'returns' '(' [ ident ] ')' ';'
def p_method_definition(self, p):
'''method_definition : RPC NAME LPAR NAME RPAR RETURNS LPAR NAME RPAR'''
p[0] = MethodDefinition(Name(LU.i(p, 2)), Name(LU.i(p, 4)), Name(LU.i(p, 8)))
self.lh.set_parse_object(p[0], p)
def p_method_definition_opt(self, p):
'''method_definition_opt : empty'''
p[0] = []
def p_method_definition_opt2(self, p):
'''method_definition_opt : method_definition
| method_definition_opt method_definition'''
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
# service_definition ::= 'service' ident '{' method_definition* '}'
# service_definition = SERVICE_ - ident("serviceName") + LBRACE + ZeroOrMore(Group(method_definition)) + RBRACE
def p_service_definition(self, p):
'''service_definition : SERVICE NAME LBRACE method_definition_opt RBRACE'''
p[0] = ServiceDefinition(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
# package_directive ::= 'package' ident [ '.' ident]* ';'
def p_package_directive(self,p):
'''package_directive : PACKAGE dotname SEMI'''
p[0] = PackageStatement(Name(LU.i(p, 2)))
self.lh.set_parse_object(p[0], p)
# import_directive = IMPORT_ - quotedString("importFileSpec") + SEMI
def p_import_directive(self, p):
'''import_directive : IMPORT STRING_LITERAL SEMI'''
p[0] = ImportStatement(Literal(LU.i(p,2)))
self.lh.set_parse_object(p[0], p)
def p_option_rvalue(self, p):
'''option_rvalue : NUM
| TRUE
| FALSE'''
p[0] = LU(p, 1)
def p_option_rvalue2(self, p):
'''option_rvalue : STRING_LITERAL'''
p[0] = Literal(LU(p,1))
def p_option_rvalue3(self, p):
'''option_rvalue : NAME'''
p[0] = Name(LU.i(p,1))
# option_directive = OPTION_ - ident("optionName") + EQ + quotedString("optionValue") + SEMI
def p_option_directive(self, p):
'''option_directive : OPTION NAME EQ option_rvalue SEMI'''
p[0] = OptionStatement(Name(LU.i(p, 2)), LU.i(p,4))
self.lh.set_parse_object(p[0], p)
# topLevelStatement = Group(message_definition | message_extension | enum_definition | service_definition | import_directive | option_directive)
def p_topLevel(self,p):
'''topLevel : message_definition
| message_extension
| enum_definition
| service_definition
| import_directive
| option_directive'''
p[0] = p[1]
def p_package_definition(self, p):
'''package_definition : package_directive'''
p[0] = p[1]
def p_packages2(self, p):
'''package_definition : empty'''
p[0] = []
def p_statements2(self, p):
'''statements : topLevel
| statements topLevel'''
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
def p_statements(self, p):
'''statements : empty'''
p[0] = []
# parser = Optional(package_directive) + ZeroOrMore(topLevelStatement)
def p_protofile(self, p):
'''protofile : package_definition statements'''
p[0] = ProtoFile(LU.i(p,1), LU.i(p,2))
self.lh.set_parse_object(p[0], p)
# Parsing starting point
def p_goal(self, p):
'''goal : STARTTOKEN protofile'''
p[0] = p[2]
def p_error(self, p):
print('error: {}'.format(p))
class ProtobufAnalyzer(object):
def __init__(self):
self.lexer = lex.lex(module=ProtobufLexer(), optimize=1)
self.parser = yacc.yacc(module=ProtobufParser(), start='goal', optimize=1)
def tokenize_string(self, code):
self.lexer.input(code)
for token in self.lexer:
print(token)
def tokenize_file(self, _file):
if type(_file) == str:
_file = file(_file)
content = ''
for line in _file:
content += line
return self.tokenize_string(content)
def parse_string(self, code, debug=0, lineno=1, prefix='+'):
self.lexer.lineno = lineno
self.parser.offset = len(prefix)
return self.parser.parse(prefix + code, lexer=self.lexer, debug=debug)
def parse_file(self, _file, debug=0):
if type(_file) == str:
_file = file(_file)
content = ''
for line in _file:
content += line
return self.parse_string(content, debug=debug)