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parser_compiler.py
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parser_compiler.py
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from code_generator import code_generator
from scanner import Scanner
from anytree import Node, RenderTree
parsing_table = {
"Program": {";": "",
"break": "Statements",
"continue": "Statements",
"ID": "Statements",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "Statements",
"global": "Statements",
"def": "Statements",
":": "",
"if": "Statements",
"else": "",
"while": "Statements",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "Statements",
},
"Statements": {";": "epsilon",
"break": "Statement ; Statements",
"continue": "Statement ; Statements",
"ID": "Statement ; Statements",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "Statement ; Statements",
"global": "Statement ; Statements",
"def": "Statement ; Statements",
":": "",
"if": "Statement ; Statements",
"else": "epsilon",
"while": "Statement ; Statements",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "epsilon \\sem_main",
},
"Statement": {";": "synch",
"break": "Simple_stmt",
"continue": "Simple_stmt",
"ID": "Simple_stmt",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "Simple_stmt",
"global": "Simple_stmt",
"def": "Compound_stmt",
":": "",
"if": "Compound_stmt",
"else": "",
"while": "Compound_stmt",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": ""
},
"Simple_stmt": {";": "synch",
"break": "break \\break",
"continue": "continue \\continue",
"ID": "Assignment_Call",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "Return_stmt",
"global": "Global_stmt",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Compound_stmt": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "Function_def",
":": "",
"if": "If_stmt",
"else": "",
"while": "Iteration_stmt",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Assignment_Call": {";": "synch",
"break": "",
"continue": "",
"ID": "ID \\pid B",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"B": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "\\install = C \\assign",
"[": "[ Expression ] = C \\assignArr",
"]": "",
"(": "( Arguments \\func_call ) \\funcRes",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"C": {";": "synch",
"break": "",
"continue": "",
"ID": "Expression",
"=": "",
"[": "[ \\start_list Expression \\append List_Rest ]",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "Expression",
"$": "",
},
"List_Rest": {";": "",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "epsilon \\endList",
"(": "",
")": "",
",": ", Expression \\append List_Rest",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Return_stmt": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "return Return_Value",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Return_Value": {";": "epsilon \\return_zero",
"break": "",
"continue": "",
"ID": "Expression \\return",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "Expression \\return",
"$": "",
},
"Global_stmt": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "global ID \\pidGlobal",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Function_def": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "def ID \\func_def ( Params ) : \\func_line Statements \\end_func",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Params": {";": "",
"break": "",
"continue": "",
"ID": "ID \\param Params_Prime",
"=": "",
"[": "",
"]": "",
"(": "",
")": "epsilon",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Params_Prime": {";": "",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "epsilon",
",": ", ID \\param Params_Prime",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"If_stmt": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "if Relational_Expression \\save : Statements Else_block",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Else_block": {";": "\\jpf epsilon",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "else : \\jpf_save Statements \\jp",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Iteration_stmt": {";": "synch",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "while \\label ( Relational_Expression ) \\save Statements \\while",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Relational_Expression": {";": "",
"break": "",
"continue": "",
"ID": "Expression Relop Expression \\relationalExpression",
"=": "",
"[": "",
"]": "",
"(": "",
")": "synch",
",": "",
"return": "",
"global": "",
"def": "",
":": "synch",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "Expression Relop Expression \\relationalExpression",
"$": "",
},
"Relop": {";": "",
"break": "",
"continue": "",
"ID": "synch",
"=": "",
"[": "",
"]": "",
"(": "",
")": "",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "== \\eRelop",
"<": "< \\lRelop",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "synch",
"$": "",
},
"Expression": {";": "synch",
"break": "",
"continue": "",
"ID": "Term Expression_Prime",
"=": "",
"[": "",
"]": "synch",
"(": "",
")": "synch",
",": "synch",
"return": "",
"global": "",
"def": "",
":": "synch",
"if": "",
"else": "",
"while": "",
"==": "synch",
"<": "synch",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "Term Expression_Prime",
"$": "",
},
"Expression_Prime": {";": "epsilon",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "epsilon",
"(": "",
")": "epsilon",
",": "epsilon",
"return": "",
"global": "",
"def": "",
":": "epsilon",
"if": "",
"else": "",
"while": "",
"==": "epsilon",
"<": "epsilon",
"+": "+ Term \\add Expression_Prime",
"-": "- Term \\sub Expression_Prime",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Term": {";": "synch",
"break": "",
"continue": "",
"ID": "Factor Term_Prime",
"=": "",
"[": "",
"]": "synch",
"(": "",
")": "synch",
",": "synch",
"return": "",
"global": "",
"def": "",
":": "synch",
"if": "",
"else": "",
"while": "",
"==": "synch",
"<": "synch",
"+": "synch",
"-": "synch",
"*": "",
"**": "",
"NUM": "Factor Term_Prime",
"$": "",
},
"Term_Prime": {";": "epsilon",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "epsilon",
"(": "",
")": "epsilon",
",": "epsilon",
"return": "",
"global": "",
"def": "",
":": "epsilon",
"if": "",
"else": "",
"while": "",
"==": "epsilon",
"<": "epsilon",
"+": "epsilon",
"-": "epsilon",
"*": "* Factor \\mult Term_Prime",
"**": "",
"NUM": "",
"$": "",
},
"Factor": {";": "synch",
"break": "",
"continue": "",
"ID": "Atom Power",
"=": "",
"[": "",
"]": "synch",
"(": "",
")": "synch",
",": "synch",
"return": "",
"global": "",
"def": "",
":": "synch",
"if": "",
"else": "",
"while": "",
"==": "synch",
"<": "synch",
"+": "synch",
"-": "synch",
"*": "synch",
"**": "",
"NUM": "Atom Power",
"$": "",
},
"Power": {";": "Primary",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "Primary",
"]": "Primary",
"(": "Primary",
")": "Primary",
",": "Primary",
"return": "",
"global": "",
"def": "",
":": "Primary",
"if": "",
"else": "",
"while": "",
"==": "Primary",
"<": "Primary",
"+": "Primary",
"-": "Primary",
"*": "Primary",
"**": "** Factor \\pow",
"NUM": "",
"$": "",
},
"Primary": {";": "epsilon",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "[ Expression \\calculate_primary ] Primary",
"]": "epsilon",
"(": "( Arguments \\func_call_primary ) Primary",
")": "epsilon",
",": "epsilon",
"return": "",
"global": "",
"def": "",
":": "epsilon",
"if": "",
"else": "",
"while": "",
"==": "epsilon",
"<": "epsilon",
"+": "epsilon",
"-": "epsilon",
"*": "epsilon",
"**": "",
"NUM": "",
"$": "",
},
"Arguments": {";": "",
"break": "",
"continue": "",
"ID": "\\arguments_count Expression \\argument Arguments_Prime",
"=": "",
"[": "",
"]": "",
"(": "",
")": "\\arguments_count epsilon",
",": "",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "\\arguments_count Expression \\argument Arguments_Prime",
"$": "",
},
"Arguments_Prime": {";": "",
"break": "",
"continue": "",
"ID": "",
"=": "",
"[": "",
"]": "",
"(": "",
")": "epsilon",
",": ", Expression \\argument Arguments_Prime",
"return": "",
"global": "",
"def": "",
":": "",
"if": "",
"else": "",
"while": "",
"==": "",
"<": "",
"+": "",
"-": "",
"*": "",
"**": "",
"NUM": "",
"$": "",
},
"Atom": {";": "synch",
"break": "",
"continue": "",
"ID": "ID \\pid",
"=": "",
"[": "synch",
"]": "synch",
"(": "synch",
")": "synch",
",": "synch",
"return": "",
"global": "",
"def": "",
":": "synch",
"if": "",
"else": "",
"while": "",
"==": "synch",
"<": "synch",
"+": "synch",
"-": "synch",
"*": "synch",
"**": "synch",
"NUM": "NUM \\pnum",
"$": "",
}
}
class Parser:
def __init__(self, st):
self.st = st
def start(self):
root, has_syntax_error = self.parse_program()
parse_tree_output = open("parse_tree.txt", "w", encoding="utf-8")
buffer = ''
for pre, fill, node in RenderTree(root):
buffer = buffer + "{:s}{:s}".format(pre, node.name) + "\n"
parse_tree_output.write(buffer)
parse_tree_output.close()
if not has_syntax_error:
self.syntax_error_output.write("There is no syntax error.")
self.syntax_error_output.close()
def parse_program(self):
self.syntax_error_output = open("syntax_errors.txt", "w", encoding="utf-8")
has_syntax_error = False
terminals = ["break", "continue", "def", "else", "if", "return", "while", "global", "[", "]", "(", ")",
"ID", "=", ";", ",", ":", "==", "<", "+", "-", "*", "**", "NUM", "$"]
sc = Scanner(self.st)
cg = code_generator(self.st)
cg_input = ""
stack = []
root = Node("Program")
stack.append(root)
while True:
token_type, token_lexeme, line_number = sc.get_next_token()
effective_token = ""
if token_type == "NUMBER":
token_type = "NUM"
effective_token = "NUM"
elif token_type == "ID": effective_token = "ID"
elif token_type in ("KEYWORD", "SYMBOL"): effective_token = token_lexeme
elif token_type == "$": effective_token = "$"
else: continue # comments and whitespaces
while True:
if (len(stack) == 0):
Node(name="$", parent=root)
cg.dump()
return root, has_syntax_error
current_node = stack.pop()
current_sentential = current_node.name
if current_sentential[0] == "\\":
cg.codegen(cg_input, current_sentential, line_number)
continue
if current_sentential in terminals:
if effective_token == current_sentential:
current_node.name = "({:s}, {:s})".format(token_type, token_lexeme)
cg_input = token_lexeme
break
else:
has_syntax_error = True
self.syntax_error_output.write("#{} : syntax error, missing {}\n".format(line_number, current_sentential))
current_node.parent = None
cg_input = token_lexeme
continue
else:
next_tokens = parsing_table[current_sentential][effective_token].split(" ")
if "" in next_tokens:
if effective_token == "$":
has_syntax_error = True
stack.append(current_node)
self.syntax_error_output.write("#{} : syntax error, Unexpected EOF\n".format(line_number))
for remaining_node in stack:
remaining_node.parent = None
cg.dump()
return root, has_syntax_error
has_syntax_error = True
stack.append(current_node)
self.syntax_error_output.write("#{} : syntax error, illegal {}\n".format(line_number, effective_token))
cg_input = token_lexeme
break
elif "synch" in next_tokens:
has_syntax_error = True
self.syntax_error_output.write("#{} : syntax error, missing {}\n".format(line_number, current_sentential))
current_node.parent = None
cg_input = token_lexeme
continue
new_nodes_list = []
for i in range (len(next_tokens)):
name = next_tokens[i]
new_node = Node(name= name, parent=current_node)
new_nodes_list.append(new_node)
for node in reversed(new_nodes_list):
if node.name != "epsilon":
stack.append(node)
cg_input = token_lexeme
cg.dump()