def _ifStatement( self, parent, symbolTable, parentClosures=[] ) :
closure = SymbolTable()
parentSym = Symbol( self._reserved.PARENT_SYMBOL_TABLE, self._reserved.PARENT_SYMBOL_NAME, symbolTable )
closure.AddSymbol( parentSym )
ifsym = Symbol( self._reserved.IF_STATEMENT, "if_%d" % (self._closureCount), closure )
self._symTable.AddSymbol( ifsym )
self._closureCount += 1
node = ParseNode( self._reserved.IF_STATEMENT, ifsym.Name )
parent.AddChild( node )
# add to list of parent closures
parentClosures.append( symbolTable )
# IF
self._eat( self._reserved.IF, "If statement expected." )
# Condition
self._condition( node, symbolTable )
# THEN
self._eat( self._reserved.THEN, "'Then' statement expected." )
# {
self._eat( self._reserved.LCURLY, "Left curly brace expected in if statement." )
# STATEMENT
statementNode = ParseNode( self._reserved.STATEMENT, None )
node.AddChild( statementNode )
self._statement( statementNode, closure, parentClosures ) # add to conditional
# }
self._eat( self._reserved.RCURLY, "Right curly brace expected in if" )
nexttoken = self._lexedSrc[self._curPos]
if nexttoken[0] == self._reserved.ELSE :
# ELSE
self._eat( self._reserved.ELSE, "Expected else statement" )
# {
self._eat( self._reserved.LCURLY, "Expected left curly brace in else statement" )
# STATEMENT
statementNode = ParseNode( self._reserved.ELSE, None )
node.AddChild( statementNode )
closure = SymbolTable()
parentSym = Symbol( self._reserved.PARENT_SYMBOL_TABLE, self._reserved.PARENT_SYMBOL_NAME, symbolTable )
closure.AddSymbol( parentSym )
elsesym = Symbol( self._reserved.ELSE, "else_%d" % (self._closureCount), closure )
statementNode.TokenValue = elsesym.Name
self._symTable.AddSymbol( elsesym )
self._closureCount += 1
self._statement( statementNode, closure, parentClosures ) # add to conditional
# }
self._eat( self._reserved.RCURLY, "Expected right curly brace in else statement" )
# remove the symbol table from the list of parents!
parentClosures.pop( len(parentClosures)-1 )
def _procedureList( self, parent, symbolTable ) : #node = ParseNode( self._reserved.PARAMETER, None ) # ) right away nexttoken = self._lexedSrc[self._curPos] if nexttoken[0] == self._reserved.RPAREN : self._eat( self._reserved.RPAREN, "Expected right parenthisis after parameter list in procedure declaration" ) return; node = ParseNode( self._reserved.PARAMETER, "" ) parent.AddChild( node ) # NUM or STRING nexttoken = self._lexedSrc[self._curPos] ndtype = None if nexttoken[0] == self._reserved.NUM : node.AddChild( ParseNode( (self._eat(self._reserved.NUM, "Expected NUM statement in parameter list."))[0], None ) ) ndtype = self._reserved.NUM elif nexttoken[0] == self._reserved.STRING : node.AddChild( ParseNode( (self._eat(self._reserved.STRING, "Expected STRING statement in parameter list."))[0], None ) ) ndtype = self._reserved.STRING # * isRef = False nexttoken = self._lexedSrc[self._curPos] if nexttoken[0] == self._reserved.MULTIPLY : isRef = True #node.AddChild( ParseNode( self._reserved.REF, None ) ) self._eat( self._reserved.MULTIPLY, "Expected reference before parameter name." ) # VARIABLE NAME vnode = self._variableName( node ) symbolTable.AddSymbol( Symbol( ndtype, vnode.TokenValue, None, True, isRef ) ) #symbolTable.AddSymbol( Symbol( self._reserved.PARAMETER, vnode.TokenValue, ndtype ) ) node.TokenValue = vnode.TokenValue # , or ) nexttoken = self._lexedSrc[self._curPos] if nexttoken[0] == self._reserved.COMMA : self._eat( self._reserved.COMMA, "Expected comma after parameter in declaration statement" ) self._procedureList( parent, symbolTable ) elif nexttoken[0] == self._reserved.RPAREN : self._eat( self._reserved.RPAREN, "Expected right parenthisis in procedure statement." )
