def parse(self):
self.stmt = Stmt()
self.stmt.parse()
if TokList.checkTok('END') or TokList.checkTok('ELSE') or TokList.checkTok('ENDIF') or TokList.checkTok('ENDWHILE'):
return
self.stmt_seq = StmtSeq()
self.stmt_seq.parse()
def parse(self):
self.factor = Factor()
self.factor.parse()
if TokList.checkTok('MULT'):
TokList.nextToken()
self.term = Term()
self.term.parse()
def parse(self):
if TokList.checkTok('ID'):
self.altNo = 1
self.s1 = Assign()
self.s1.parse()
elif TokList.checkTok('IF'):
self.altNo = 2
self.s2 = If()
self.s2.parse()
elif TokList.checkTok('WHILE'):
self.altNo = 3
self.s3 = Loop()
self.s3.parse()
elif TokList.checkTok('INPUT'):
self.altNo = 4
self.s4 = In()
self.s4.parse()
elif TokList.checkTok('OUTPUT'):
self.altNo = 5
self.s5 = Out()
self.s5.parse()
elif TokList.checkTok('CASE'):
self.altNo = 6
self.s6 = Case()
self.s6.parse()
else:
#Used to briefly check for and EOF exception
TokList.match('', 'statement')
def parse(self):
if TokList.checkTok('NOT'):
self.notStr = '!'
TokList.nextToken()
TokList.match('LEFTPARAN', 'cond')
self.cond = Cond()
self.cond.parse()
TokList.match('RIGHTPARAN', 'cond')
return
self.cmpr = Cmpr()
self.cmpr.parse()
if TokList.checkTok('OR'):
TokList.nextToken()
self.cond = Cond()
self.cond.parse()
def parse(self):
TokList.match('WHILE', 'loop')
self.cond = Cond()
self.cond.parse()
TokList.match('BEGIN', 'loop')
self.stmt_seq = StmtSeq.StmtSeq()
self.stmt_seq.parse()
TokList.match('ENDWHILE', 'loop')
TokList.match('SEMICOLON', 'loop')
def parse(self):
self.decl = Decl()
self.decl.parse()
#Checks if the decl_seq is at an end
if TokList.checkTok('BEGIN'):
return
self.decl_seq = DeclSeq()
self.decl_seq.parse()
def print(self):
TokList.printIndent()
print('while ', end='')
self.cond.print()
print(' begin')
TokList.increaseIndent()
self.stmt_seq.print()
TokList.decreaseIndent()
TokList.printIndent()
print('endwhile;')
def print(self):
print("program")
TokList.increaseIndent()
self.decl_seq.print()
TokList.decreaseIndent()
print("begin")
TokList.increaseIndent()
self.stmt_seq.print()
TokList.decreaseIndent()
print("end")
def parse(self):
self.id = Id()
self.id.parse(TokList.getIdOrConst())
TokList.nextToken()
TokList.match('ASSIGN', 'assign')
self.expr = Expr()
self.expr.parse()
TokList.match('SEMICOLON', 'assign')
def parse(self):
self.leftExpr = Expr()
self.leftExpr.parse()
if TokList.checkTok('EQUAL'):
self.checkValue = '='
TokList.nextToken()
elif TokList.checkTok('LESSTHAN'):
self.checkValue = '<'
TokList.nextToken()
elif TokList.checkTok('LESSTHANEQUAL'):
self.checkValue = '<='
TokList.nextToken()
else:
print('Error: improper syntax for comparator')
exit()
self.rightExpr = Expr()
self.rightExpr.parse()
def parse(self):
TokList.match("PROGRAM", "program")
self.decl_seq = DeclSeq()
self.decl_seq.parse()
TokList.match("BEGIN", "program")
self.stmt_seq = StmtSeq()
self.stmt_seq.parse()
TokList.match("END", "program")
#Checks for code after end of program
if not TokList.checkTok('EOF'):
print("ERROR: Improper code after end of program")
def parse(self):
TokList.nextToken()
self.const = Const()
self.const.parse(TokList.getIdOrConst())
TokList.nextToken()
if TokList.currentToken() == 'COMMA':
self.constList = ConstList()
self.constList.parse()
def parse(self):
self.id = Id()
#Passing in name of id to the parse function
self.id.parse(TokList.getIdOrConst())
TokList.nextToken()
if TokList.checkTok('COMMA'):
TokList.match('COMMA', 'id list')
self.id_list = IdList()
self.id_list.parse()
def parse(self):
self.const = Const()
self.const.parse(TokList.getIdOrConst())
TokList.nextToken()
if TokList.currentToken() == 'COMMA':
self.constList = ConstList()
self.constList.parse()
TokList.match('COLON', 'case line')
self.expr = Expr()
self.expr.parse()
self.caseLineFollow = CaseLineFollow()
self.caseLineFollow.parse()
def parse(self):
self.term = Term()
self.term.parse()
if TokList.checkTok('PLUS'):
TokList.nextToken()
self.plusOrMinus = '+'
self.expr = Expr()
self.expr.parse()
elif TokList.checkTok('MINUS'):
TokList.nextToken()
self.plusOrMinus = '-'
self.expr = Expr()
self.expr.parse()
def setIdValues(self, init):
if init == 1:
if TokList.getIdValue(self.id.name) == 'null':
print('ERROR: value ' + self.id.name +
' is already initialized')
exit()
#Initialized to 'null' as None is the previous assignment, 'null' is used later to check for initialization
TokList.setIdValue(self.id.name, 'null')
if self.id_list is not None:
self.id_list.setIdValues(1)
else:
self.id.setValue(TokList.currentData())
TokList.nextData()
if self.id_list is not None:
self.id_list.setIdValues(0)
def setValue(self, val):
if TokList.getIdValue(self.name) is None:
print('ERROR: Value not initialized')
TokList.setIdValue(self.name, val)
def parse(self):
TokList.match('INT', "decl")
self.id_list = IdList()
self.id_list.parse()
TokList.match('SEMICOLON', "decl")
def parse(self):
if TokList.checkTok('CONST'):
self.const = Const()
self.const.parse(TokList.getIdOrConst())
TokList.nextToken()
elif TokList.checkTok('ID'):
self.id = Id()
self.id.parse(TokList.getIdOrConst())
TokList.nextToken()
elif TokList.match('LEFTPARAN', 'factor'):
self.expr = Expr.Expr()
self.expr.parse()
TokList.match('RIGHTPARAN', 'factor')
def parse(self):
TokList.match('CASE','case')
self.id = Id()
self.id.parse(TokList.getIdOrConst())
TokList.nextToken()
TokList.match('OF','case')
self.case_line = CaseLine()
self.case_line.parse()
TokList.match('ELSE','case')
self.expr = Expr()
self.expr.parse()
TokList.match('END','case')
TokList.match('SEMICOLON','case')
def print(self):
TokList.printIndent()
print('case ', end='')
self.id.print()
print(' of')
TokList.increaseIndent()
TokList.printIndent()
self.case_line.print()
#Necessary for new line printings
print()
TokList.printIndent()
print('else ', end='')
self.expr.print()
print()
TokList.decreaseIndent()
TokList.printIndent()
print('end;')
def print(self):
TokList.printIndent()
self.id.print()
print(':=', end='')
self.expr.print()
print(';')
def parse(self):
TokList.match('INPUT', 'input')
self.idList = IdList()
self.idList.parse()
TokList.match('SEMICOLON', 'input')
def getValue(self):
if TokList.getIdValue(
self.name) == 'null' or TokList.getIdValue(self.name) is None:
print('ERROR: Value undeclared')
exit()
return int(TokList.getIdValue(self.name))
def parse(self):
TokList.match('OUTPUT', 'output')
self.expr = Expr()
self.expr.parse()
TokList.match('SEMICOLON', 'output')
def print(self):
TokList.printIndent()
print('output ', end='')
self.expr.print()
print(';')
def print(self):
TokList.printIndent()
print('if ', end='')
self.cond.print()
print(' then')
TokList.increaseIndent()
self.stmt_seq_then.print()
if self.stmt_seq_else is not None:
TokList.decreaseIndent()
TokList.printIndent()
print('else')
TokList.increaseIndent()
self.stmt_seq_else.print()
TokList.decreaseIndent()
TokList.printIndent()
print('endif;')
def print(self):
TokList.printIndent()
self.decl.print()
print(';')
if self.decl_seq is not None:
self.decl_seq.print()
def print(self):
TokList.printIndent()
print('input ', end='')
self.idList.print()
print(';')
from program import Program from Tokenizer import TokList import sys #Recieves the command line arguements for execution TokList.getFiles(sys.argv[1], sys.argv[2]) #Declares the program object p = Program() #Parses, prints, and executes p.parse() p.print() p.exec()