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Rec_des_Pars.py
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buffer = []
scan_cnt = 0
KEYWORD = {"main", "if", "then", "else", "while", "do", "begin",
"end", "var", "integer", "real", "for", "function",
"array", "procedure", "result", "program", "READ", "WRITE"}
RELOP = {"=", "<>", "<=", ">=", ">", "<"}
ADDOP = {"+", "-", "or"}
MULOP = {"*", "/", "div", "mod", "and"}
ASSIGNOP = {":="}
SPECIALSYMBOL = {"(", ")", ",", ":", ";"}
CONSTANT = list(range(0, 10))
def Type_Detection(type):
if type in KEYWORD:
return "KEYWORD"
elif type in RELOP:
return "RELOP"
elif type in ADDOP:
return "ADDOP"
elif type in MULOP:
return "MULOP"
elif type in ASSIGNOP:
return "ASSIGNOP"
elif type in SPECIALSYMBOL:
return "SPECIALSYMBOL"
elif type in CONSTANT:
return "CONSTANT"
else:
return "IDENTIFIER"
with open("source_code.txt") as f:
token_table = open("token_table.txt", "w")
for line in f:
for word in line.split():
temp = [word, Type_Detection(word)]
buffer.extend([temp])
token_table.write(str(temp) + "\n")
token_table.close()
def nextToken():
global scan_cnt
if scan_cnt > len(buffer):
return "Error in reading buffer!"
else:
temp = [buffer[scan_cnt]]
scan_cnt += 1
return temp
# print(nextToken())
def identifier_list(token):
# if identifier_list(token):
if token[0][1] == "IDENTIFIER":
token = nextToken()
if token[0][0] == ",":
token = nextToken()
if token[0][1] == "IDENTIFIER":
return True
else:
global scan_cnt
scan_cnt -= 1
return True
# elif token[0][1] == "IDENTIFIER":
# return True
def standard_type(token):
if token[0][0] == "integer":
return True
elif token[0][0] == "real":
return True
def array_type(token):
if token[0][0] == "array":
token = nextToken()
if token[0][0] == "[":
token = nextToken()
if token[0][1] == "CONSTANT":
token = nextToken()
if token[0][0] == "..":
token = nextToken()
if token[0][1] == "CONSTANT":
token = nextToken()
if token[0][0] == "]":
token = nextToken()
if token[0][0] == "of":
token = nextToken()
if standard_type(token):
return True
def type_func(token):
if standard_type(token):
return True
elif array_type(token):
return True
def declaration_list(token):
if identifier_list(token):
token = nextToken()
if token[0][0] == ":":
token = nextToken()
if type_func(token):
token = nextToken()
if token[0][0] == ";":
return True
elif declaration_list(token):
token = nextToken()
if identifier_list(token):
token = nextToken()
if token[0][0] == ":":
token = nextToken()
if type_func(token):
token = nextToken()
if token[0][0] == ";":
return True
def declarations(token):
if token[0][0] == "var":
token = nextToken()
if declaration_list(token):
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def parameter_list(token):
if identifier_list(token):
token = nextToken()
if token[0][0] == ":":
token = nextToken()
if type_func(token):
return True
elif parameter_list(token):
token = nextToken()
if token[0][0] == ";":
token = nextToken()
if identifier_list(token):
token = nextToken()
if token[0][0] == ":":
token = nextToken()
if type_func(token):
return True
def arguments(token):
if token[0][0] == "(":
token = nextToken()
if parameter_list(token):
token = nextToken()
if token[0][0] == ")":
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def subprogram_head(token):
if token[0][0] == "function":
token = nextToken()
if token[0][1] == "IDENTIFIER":
token = nextToken()
if arguments(token):
token = nextToken()
if token[0][0] == ":":
token = nextToken()
if token[0][0] == "result":
token = nextToken()
if standard_type(token):
token = nextToken()
if token[0][0] == ";":
return True
elif token[0][0] == "procedure":
token = nextToken()
if token[0][1] == "IDENTIFIER":
token = nextToken()
if arguments(token):
token = nextToken()
if token[0][0] == ";":
return True
def subprogram_declaration(token):
if subprogram_head(token):
token = nextToken()
if declarations(token):
token = nextToken()
if compound_statement(token):
return True
def subprogram_declarations(token):
# if subprogram_declarations(token):
# token = nextToken()
if subprogram_declaration(token):
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def function_reference(token):
if token[0][1] == "IDENTIFIER":
token = nextToken()
if token[0][0] == "(":
token = nextToken()
if expression_list(token):
token = nextToken()
if token[0][0] == ")":
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def factor(token):
if function_reference(token):
return True
elif variable(token):
return True
elif token[0][1] == "CONSTANT":
return True
elif token[0][0] == "(":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == ")":
return True
elif function_reference(token):
return True
elif token[0][0] == "not":
token = nextToken()
if factor(token):
return True
def term(token):
if factor(token):
return True
elif term(token):
token = nextToken()
if token[0][1] == "MULOP":
token = nextToken()
if factor(token):
return True
def sign(token):
if token[0][0] == "+":
return True
elif token[0][0] == "-":
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def simple_expression(token):
if term(token):
return True
elif sign(token):
token = nextToken()
if term(token):
return True
elif simple_expression(token):
token = nextToken()
if token[0][1] == "ADDOP":
token = nextToken()
if term(token):
return True
def expression(token):
if simple_expression(token):
token = nextToken()
if token[0][1] == "RELOP":
token = nextToken()
if simple_expression(token):
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def expression_list(token):
if expression(token):
# return True
# elif expression_list(token):
token = nextToken()
if token[0][0] == ",":
token = nextToken()
if expression(token):
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def variable(token):
if token[0][1] == "IDENTIFIER": #-------wrong
token = nextToken()
if token[0][0] == "[":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "]":
return True
else:
global scan_cnt
scan_cnt -= 1
return True
def procedure_statement(token):
if token[0][1] == "IDENTIFIER":
token = nextToken()
if token[0][0] == "(":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == ")":
return True
else:
global scan_cnt
scan_cnt -= 1
token = nextToken()
if token[0][1] == "IDENTIFIER":
return True
def elementary_statement(token):
if variable(token):
token = nextToken()
if token[0][1] == "ASSIGNOP":
token = nextToken()
if expression(token):
return True
elif procedure_statement(token):
return True
elif compound_statement(token):
return True
def restricted_statement(token):
if elementary_statement(token):
return True
elif token[0][0] == "if":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "then":
token = nextToken()
if restricted_statement(token):
token = nextToken()
if token[0][0] == "else":
token = nextToken()
if restricted_statement(token):
return True
elif token[0][0] == "while":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "do":
token = nextToken()
if restricted_statement(token):
return True
def statement(token):z
if elementary_statement(token):
return True
elif token[0][0] == "if":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "then":
token = nextToken()
if restricted_statement(token):
token = nextToken()
if token[0][0] == "else":
token = nextToken()
if statement(token):
return True
elif token[0][0] == "if":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "then":
token = nextToken()
if statement(token):
return True
elif token[0][0] == "while":
token = nextToken()
if expression(token):
token = nextToken()
if token[0][0] == "do":
token = nextToken()
if statement(token):
return True
def statement_list(token):
if statement(token):
return True
elif statement_list(token):
token = nextToken()
if token[0][0] == ";":
token = nextToken()
if statement(token):
return True
def compound_statement(token):
if token[0][0] == "begin":
token = nextToken()
if statement_list(token):
token = nextToken()
if token[0][0] == "end":
return True
def program(token):
if token[0][0] == "program":
token = nextToken()
if token[0][1] == "IDENTIFIER":
token = nextToken()
if token[0][0] == "(":
token = nextToken()
# print(token)
if identifier_list(token):
token = nextToken()
if token[0][0] == ")":
token = nextToken()
if token[0][0] == ";":
token = nextToken()
if declarations(token):
token = nextToken()
if subprogram_declarations(token):
token = nextToken()
if compound_statement(token):
return True
if __name__ == '__main__':
if program(nextToken()):
print("Parse Successfully Done!")
else:
print("Some Error has occurred during parsing!")