Package picasso.parser

Class SemanticAnalyzer

java.lang.Object

picasso.parser.SemanticAnalyzer

All Implemented Interfaces:

SemanticAnalyzerInterface

public class SemanticAnalyzer
extends Object
implements SemanticAnalyzerInterface

SemanticAnalyzer calls appropriate SemanticAnalyzer for the given token

Method Summary

Modifier and Type	Method	Description
void	defineVariable(String name, ExpressionTreeNode expr)
ExpressionTreeNode	generateExpressionTree(Stack<Token> tokens)	From a stack of tokens in postfix order, creates an expression tree
static SemanticAnalyzer	getInstance()	Make sure that there is only one semantic analyzer for the application.
ExpressionTreeNode	getVariable(String name)
Map<String,ExpressionTreeNode>	getVariables()
boolean	isVariableDefined(String name)
void	setVariables(Map<String,ExpressionTreeNode> variables)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

setVariables

public void setVariables(Map<String,ExpressionTreeNode> variables)

getVariables

public Map<String,ExpressionTreeNode> getVariables()

defineVariable

public void defineVariable(String name,
                           ExpressionTreeNode expr)

isVariableDefined

public boolean isVariableDefined(String name)

getVariable

public ExpressionTreeNode getVariable(String name)

getInstance

public static SemanticAnalyzer getInstance()

Make sure that there is only one semantic analyzer for the application.

Returns:

the semantic analyzer

generateExpressionTree

public ExpressionTreeNode generateExpressionTree(Stack<Token> tokens)

From a stack of tokens in postfix order, creates an expression tree

Specified by:

generateExpressionTree in interface SemanticAnalyzerInterface

Parameters:

tokens - in postfix order

Returns:

the root node of the expression tree.