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com.voytechs.jnetstream.npl
Class ExpressionParser  

java.lang.Object
  com.voytechs.jnetstream.npl.ExpressionParser

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public class ExpressionParser

extends java.lang.Object

Express parser. A standard C-Like expression will be parsed into an expression tree. The expression tree then can be traversed and evaluated via a number of methods. The expression parser is called using the parseExpression() method and passing it a String containing the expression to be parsed. The parser has the following operators defined:

"+" - class PlusOpNode - NORMAL/BINARY "-" - class MinusOpNode - NORMAL/BINARY "*" - class MultiplyOpNode - HIGH/BINARY "/" - class DivideOpNode - HIGH/BINARY "&" - class AndOpNode - HIGH/BINARY "|" - class OrOpNode - HIGH/BINARY "%" - class ModOpNode - NORMAL/BINARY "^" - class PowOpNode - NORMAL/BINARY "~" - class InverseOpNode - LOW/UNARY "&&" - class LogicalAndOpNode - NORMAL/BINARY "||" - class LogicalOrOpNode - NORMAL/BINARY "!" - class LogicalNotOpNode - LOW/UNARY "==" - class LogicalEqualOpNode - NORMAL/BINARY "!=" - class LogicalNotEqualOpNode - NORMAL/BINARY "<" - class LessThanOpNode - NORMAL/BINARY "<=" - class LessEqualsOpNode - NORMAL/BINARY "<=" - class GreaterThanOpNode - NORMAL/BINARY "<=" - class GreaterEqualsThanOpNode - NORMAL/BINARY

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Field Summary
static java.util.Hashtable	context
private static boolean	debug
protected  java.lang.String	expression
protected  java.util.Stack	s1
protected  java.util.Stack	s2

 

Constructor Summary

ExpressionParser()           Initialize the parser.

 

Method Summary
static void	main(java.lang.String[] args)           Test function for ExpressionParser
Node	parse(java.io.Reader input)           Returns the root node of the parse tree or Glyths.
Node	parse(java.lang.String exp)           Returns the root node of the parse tree or Glyths.
protected  Node	parseExpression(ExpTokenizer tokens)           Returns the root node of the parsed tree or Glyths.
protected  void	processBuiltinStatement(ExpTokenizer tokens, Token token, Token peek)           Processes tokens that are builtin statement or variables.
protected  void	processOpNodes()           Processes all of the OP nodes found on the stack until the stack is emptied.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

debug

private static final boolean debug

See Also:

Constant Field Values

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s1

protected java.util.Stack s1

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s2

protected java.util.Stack s2

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expression

protected java.lang.String expression

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context

public static java.util.Hashtable context

Constructor Detail

ExpressionParser

public ExpressionParser()

Initialize the parser.

Method Detail

parse

public Node parse(java.lang.String exp)
           throws SyntaxError

Returns the root node of the parse tree or Glyths.

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parse

public Node parse(java.io.Reader input)
           throws SyntaxError

Returns the root node of the parse tree or Glyths.

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parseExpression

protected Node parseExpression(ExpTokenizer tokens)
                        throws SyntaxError

Returns the root node of the parsed tree or Glyths.

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processBuiltinStatement

protected void processBuiltinStatement(ExpTokenizer tokens,
                                       Token token,
                                       Token peek)

Processes tokens that are builtin statement or variables.

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processOpNodes

protected void processOpNodes()

Processes all of the OP nodes found on the stack until the stack is emptied. The two stacks are s1 for operators and s2 for operands (parameters)

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main

public static void main(java.lang.String[] args)

Test function for ExpressionParser

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