/
parser.py
686 lines (487 loc) · 17.5 KB
/
parser.py
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from graphviz import Digraph
from scanner import*
class parser:
def __init__(self,tokens):
self.next_token=tokens
self.i=0
self.g = Digraph('G')
self.left=" "
self.right=" "
self.parent=" "
self.child=" "
self.ii=0
self.o=0
def match(self,token,s):
if(token==s):
return s
else:
return False
def program(self):
if(self.stmt_sequence()!=False):
f = open('output.txt', 'a')
f.write('\n' + "stmt-sequence found")
f.close()
return True
else:
return False
def stmt_sequence(self):
left2 = " "
right2 = " "
t2=self.statement()
if(t2!=False):
left2=t2
f = open('output.txt', 'a')
f.write('\n' + "statement found")
f.close()
parent2=left2
while (self.i<len(self.next_token)):
if self.next_token[self.i][0] == ";":
print("pisoo")
self.i=self.i+1
print(self.next_token[self.i][0])
p=self.statement()
if(p!=False):
right2=p
print(right2)
parent2=";"
self.g.node(left2[0],left2[1])
self.g.node(right2[0],right2[1])
with self.g.subgraph() as c:
c.attr(rank='same')
c.edge(left2[0],right2[0])
left2=right2
else:
break
else:
break
#return False
return left2
else:
return False
def statement(self):
if(self.i<len(self.next_token)):
if(self.next_token[self.i][0]=="if"):
ht=self.IF_stmt()
if(ht!=False):
f = open('output.txt', 'a')
f.write('\n' + "if-statement found")
f.close()
return ht
else:
return False
elif(self.next_token[self.i][0]=="repeat"):
t=self.repeat_stmt()
if(t!=False):
f = open('output.txt', 'a')
f.write('\n' + "repeat-statement found")
f.close()
return t
else:
return False
elif(self.next_token[self.i][0]=="identifier"):
t=self.assign_stmt()
if(t!=False):
f = open('output.txt', 'a')
f.write('\n' + "assign-statement found")
f.close()
return t
else:
return False
elif (self.next_token[self.i][0]=="read"):
print("hiii")
tt=self.read_stmt()
if(tt!=False):
f = open('output.txt', 'a')
f.write('\n' + "read-statement found")
f.close()
return tt
else:
return False
elif (self.next_token[self.i][0]== "write"):
t=self.write_stmt()
if(t!=False):
f = open('output.txt', 'a')
f.write('\n' + "write-statement found")
f.close()
return t
else:
return False
else:
return False
else:
return " "
def IF_stmt(self):
if(self.match(self.next_token[self.i][0], "if")):
self.i=self.i+1
x=self.next_token[self.i][0]
ex3=self.exp()
if(ex3!=False):
f = open('output.txt', 'a')
f.write('\n' + "expression found")
f.close()
self.i=self.i-1
print(self.next_token[self.i][0])
if(self.match(self.next_token[self.i][0], "then")):
self.i = self.i + 1
st3=self.stmt_sequence()
if(st3!=False):
f = open('output.txt', 'a')
f.write('\n' + "stmt-sequence found")
f.close()
self.g.node('if','if')
self.g.node(ex3[0],ex3[1])
self.g.node(st3[0],st3[1])
self.g.edge('if',ex3[0])
self.g.edge('if',st3[0])
parent="if"
if (self.next_token[self.i] == "else"):
self.match(self.next_token[self.i][0], "else")
self.i=self.i+1
st2=self.stmt_sequence()
if(st2!=False):
f = open('output.txt', 'a')
f.write('\n' + "stmt-sequence found")
f.close()
#self.i=self.i-1
self.g.node('el','else')
self.g.node(st2[0],st2[1])
self.g.edge('if','e1')
self.g.edge('if',st2[0])
parent = "if"
else:
return False
if (self.match(self.next_token[self.i][0], "end")):
print("[")
self.i=self.i+1
return ['if','if']
else:
return False
else:
return False
else:
return False
else:
return False
def repeat_stmt(self):
x=0
if(self.match(self.next_token[self.i][0], "repeat")):
print("jojo")
self.i = self.i + 1
stt=self.stmt_sequence()
if(stt!=False):
f = open('output.txt', 'a')
f.write('\n' + "stmt-sequence found")
f.close()
#self.i=self.i+1
if(self.match(self.next_token[self.i][0], "until")):
self.i = self.i + 1
exx=self.exp()
if(exx!=False):
f = open('output.txt', 'a')
f.write('\n' + "expession found")
f.close()
self.i = self.i -1
print("kkk")
print(self.next_token[self.i][0])
self.g.node('re','repeat')
self.g.node(stt[0],stt[1])
self.g.node(exx[0],exx[1])
self.g.node('l','until')
self.g.edge('l',exx[0])
self.g.edge('re',stt[0])
self.g.edge('re','l')
self.parent="repeat"
x1=self.o
self.o+=self.o
return ['re','repeat']
else :
return False
else:
return False
else:
return False
else:
return False
def assign_stmt(self):
n=0
if(self.match(self.next_token[self.i][0], "identifier")):
gj = self.next_token[self.i][1]
self.i = self.i + 1
if(self.match(self.next_token[self.i][0], ":=")):
self.i = self.i + 1
t=self.exp()
if(t!=False):
self.g.node('='+str(self.o),'=')
self.g.node('l2'+str(self.o),gj)
self.g.node(t[0],t[1])
self.g.edge('='+str(self.o),'l2'+str(self.o))
self.g.edge('='+str(self.o),t[0])
print("nono")
print(self.next_token[self.i][1])
f = open('output.txt', 'a')
f.write('\n' + "expression found")
f.close()
print(self.next_token[self.i][1])
parentt="="
n=self.o
self.o+=self.o
return ['='+str(n),'=']
else:
return False
else:
return False
else:
return False
def read_stmt(self):
if(self.match(self.next_token[self.i][0], "read")):
parenty = "read"
self.g.node('r','read')
self.i = self.i + 1
if(self.match(self.next_token[self.i][0], "identifier")):
self.g.node('c1',self.next_token[self.i][1])
self.g.edge('r','c1')
parenty = "read"
self.i = self.i + 1
return ['r','read']
else:
return False
else:
return False
def write_stmt(self):
if(self.match(self.next_token[self.i][0], "write")):
self.parent="write"
self.g.node('w','write')
self.i=self.i+1
t5=self.exp()
if(t5!=False):
self.child=t5
f = open('output.txt', 'a')
f.write('\n' + "expression found")
f.close()
self.g.node(self.child[0], self.child[1])
#self.i = self.i + 1
self.g.edge('w',self.child[0])
self.parent="write"
return ['w','write']
else:
return False
else:
return False
def exp(self):
xx=0
t55=self.simple_exp()
print(t55)
if(t55!=False):
left4=t55
f = open('output.txt', 'a')
f.write('\n' + "simple-exp found")
f.close()
parent4=left4
while(self.next_token[self.i][0]=="<" or self.next_token[self.i][0]=="="):
h1=self.comparison_op()
if(h1!=False):
f = open('output.txt', 'a')
f.write('\n' + "comparison-operation found")
f.close()
parent4=h1
l1=self.simple_exp()
if(l1!=False):
right4=l1
f = open('output.txt', 'a')
f.write('\n' + "simple-exp found")
f.close()
self.g.node(parent4[0]+str(self.o),parent4[1])
self.g.node(left4[0]+str(self.o)+str(6),left4[1])
#print(self.left)
#print(self.right)
#print(self.parent)
self.g.edge(parent4[0]+str(self.o),left4[0]+str(self.o)+str(6))
self.g.node(right4[0] + str(self.o), right4[1])
self.g.edge(parent4[0]+str(self.o),right4[0]+str(self.o))
print("pipo")
print(left4)
print(right4)
print(parent4)
xx=self.o
left4=parent4
left4[0]=left4[0]+str(xx)
self.o+=15
self.i = self.i + 1
else:
return False
else:
return False
#print(self.parent)
return parent4
else:
return False
def comparison_op(self):
v=0
if(self.match(self.next_token[self.i][0],"<")):
y=self.next_token[self.i][0]
self.i = self.i + 1
v=self.o
self.o+=self.o
return [y+str(v),y]
elif(self.match(self.next_token[self.i][0],"=")):
y=self.next_token[self.i][0]
self.i = self.i + 1
v = self.o
self.o += self.o
print("hi")
return [y+str(v),y]
else:
return False
def simple_exp(self):
t6=self.term()
if(t6!=False):
#self.left=t
f = open('output.txt', 'a')
f.write('\n' + "term found")
f.close()
h6=t6
while(self.next_token[self.i][0]=="+" or self.next_token[self.i][0]=="-" ):
h6=self.addop()
if(h6!=False):
#self.parent=h
f = open('output.txt', 'a')
f.write('\n' + "addop found")
f.close()
k6=self.term()
if(k6!=False):
#self.right=k
self.g.node(h6[0],h6[1])
self.g.node(t6[0]+str(7),t6[1])
self.g.node(k6[0]+str(6),k6[1])
self.g.edge(h6[0],t6[0]+str(7))
self.g.edge(h6[0], k6[0]+str(6))
#self.left=sh6[elf.parent
t6=h6
#self.i = self.i + 1
continue
else:
return False
else:
return False
return h6
else:
return False
def addop(self):
e=0
if(self.match(self.next_token[self.i][0],"+")):
y=self.next_token[self.i][0]
self.i = self.i + 1
e=self.o
self.o+=1
return ['+'+str(e),y]
elif(self.match(self.next_token[self.i][0],"-")):
y=self.next_token[self.i][0]
self.i = self.i + 1
e = self.o
self.o += 1
return ['-'+str(e),y]
else:
return False
def term(self):
m=0
left0=self.factor()
self.g.node('a',left0)
if(left0!=False):
f = open('output.txt', 'a')
f.write('\n' + "factor found")
f.close()
t7=left0
while(self.next_token[self.i][0]=="*" or self.next_token[self.i][0]=="/" ):
t7=self.mulop()
if(t7!=False):
f = open('output.txt', 'a')
f.write('\n' + "mulop found")
f.close()
parent0=t7
print(t7)
right0 = self.factor()
print("this is")
print('a'+str(self.o))
print(t7)
self.g.node('a'+str(self.o),t7)
self.g.node('b'+str(self.o),left0)
self.g.node('c'+str(self.o),right0)
self.g.edge('a'+str(self.o),'b'+str(self.o))
self.g.edge('a'+str(self.o),'c'+str(self.o))
left0=t7
m=self.o
self.o += self.o
if(right0!=False):
self.i = self.i
else:
return False
else:
return False
print(t7)
return ['a'+str(m),t7]
else:
return False
def mulop(self):
z=0
if(self.match(self.next_token[self.i][0],"*")):
y=self.next_token[self.i][0]
self.i=self.i+1
z=self.o
self.o+=1
return y
elif(self.match(self.next_token[self.i][0],"/")):
y=self.next_token[self.i][0]
self.i=self.i+1
z = self.o
self.o += 1
return y
else:
return False
def factor(self):
if (self.next_token[self.i][0]=="("):
if(self.match(self.next_token[self.i][0],"(")):
self.i = self.i + 1
if(self.exp()):
f = open('output.txt', 'a')
f.write('\n' + "expression found")
f.close()
if(self.match(self.next_token[self.i][0],")")):
self.i = self.i + 1
return True
else:
return False
else:
return False
else:
return False
elif(self.next_token[self.i][0]=="number"):
if(self.match(self.next_token[self.i][0],"number")):
y=self.next_token[self.i][1]
self.i = self.i + 1
return str(y)
else:
return False
elif (self.next_token[self.i][0] == "identifier"):
if(self.match(self.next_token[self.i][0], "identifier")):
y= self.next_token[self.i][1]
print(y)
self.i = self.i + 1
print(self.next_token[self.i][1])
return y
else:
return False
def parse(self):
if(self.program()!=False):
f = open('output.txt', 'a')
f.write('\n' + "program found")
f.close()
self.g.view()
return True
f = open('Input.txt', 'r')
text=f.read()
f.close()
s=scanner(text)
parse_input=s.scan()
print(parse_input)
p =parser(parse_input)
p.parse()