PythonCompiler/parser.py at master · marcelogdeandrade/PythonCompiler · GitHub

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fromrplyimportParserGenerator
fromastimportNumber, Sum, Sub, Print


classParser():
def__init__(self, module, builder, printf):
self.pg=ParserGenerator(
# A list of all token names accepted by the parser.
 ['NUMBER', 'PRINT', 'OPEN_PAREN', 'CLOSE_PAREN',
'SEMI_COLON', 'SUM', 'SUB']
 )
self.module=module
self.builder=builder
self.printf=printf

defparse(self):
@self.pg.production('program : PRINT OPEN_PAREN expression CLOSE_PAREN SEMI_COLON')
defprogram(p):
returnPrint(self.builder, self.module, self.printf, p[2])

@self.pg.production('expression : expression SUM expression')
@self.pg.production('expression : expression SUB expression')
defexpression(p):
left=p[0]
right=p[2]
operator=p[1]
ifoperator.gettokentype() =='SUM':
returnSum(self.builder, self.module, left, right)
elifoperator.gettokentype() =='SUB':
returnSub(self.builder, self.module, left, right)

@self.pg.production('expression : NUMBER')
defnumber(p):
returnNumber(self.builder, self.module, p[0].value)

@self.pg.error
deferror_handle(token):
raiseValueError(token)

defget_parser(self):
returnself.pg.build()