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):
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.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):
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 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):
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):
TokList.match('IF', 'if')
self.cond = Cond()
self.cond.parse()
TokList.match('THEN', 'if')
self.stmt_seq_then = StmtSeq.StmtSeq()
self.stmt_seq_then.parse()
if TokList.checkTok('ELSE'):
TokList.nextToken()
self.stmt_seq_else = StmtSeq.StmtSeq()
self.stmt_seq_else.parse()
TokList.match('ENDIF', 'if')
TokList.match('SEMICOLON', 'if')
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.match('INT', "decl")
self.id_list = IdList()
self.id_list.parse()
TokList.match('SEMICOLON', "decl")
def parse(self):
TokList.match('INPUT', 'input')
self.idList = IdList()
self.idList.parse()
TokList.match('SEMICOLON', 'input')
def parse(self):
TokList.match('OUTPUT', 'output')
self.expr = Expr()
self.expr.parse()
TokList.match('SEMICOLON', 'output')
def parse(self):
if not TokList.checkTok('BAR'):
return
TokList.match('BAR', 'case line follow')
self.caseLine = CaseLine.CaseLine()
self.caseLine.parse()