ExpressionParser (JSynoptic Java Documentation (version 2.4.2))

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jsynoptic.parser
Class ExpressionParser

java.lang.Object
  jsynoptic.parser.ExpressionParser

All Implemented Interfaces:: ExpressionParserConstants, ExpressionParserTreeConstants

public class ExpressionParser
extends java.lang.Object
implements ExpressionParserTreeConstants, ExpressionParserConstants
extends java.lang.Object
implements ExpressionParserTreeConstants, ExpressionParserConstants

Field Summary
`protected java.util.Vector`	`classes`
`Token`	`jj_nt`
`protected jsynoptic.parser.JJTExpressionParserState`	`jjtree`
`boolean`	`lookingAhead`
`protected java.util.Vector`	`methods`
`Token`	`token`
`ExpressionParserTokenManager`	`token_source`
`protected java.util.Vector`	`variables` The mechanism to decide between functions or variables is as follow : We maintain a list of variables : this is a java.util.Vector of objects implementing the Variable interface.

Fields inherited from interface jsynoptic.parser.ExpressionParserTreeConstants
`JJTADDITION, JJTBOOLEANTEST, JJTFUNCTIONCALL, JJTLOGICALOPERATION, JJTMULTIPLICATION, jjtNodeName, JJTNUMBER, JJTPOWER, JJTUNARYOPERATION, JJTUNARYOPERATOR, JJTVOID`

Fields inherited from interface jsynoptic.parser.ExpressionParserConstants
`ALPHANUM, BLANK, DEC, DEFAULT, DOUBLEQUOTE, EOF, HEX, IDENTIFIER, LOGICAL_OPERATOR, NINT, NUMBER, SCI, SINGLEQUOTE, tokenImage, ZINT`

Constructor Summary
`ExpressionParser(ExpressionParserTokenManager tm)`
`ExpressionParser(java.io.InputStream stream)`
`ExpressionParser(java.io.Reader stream)`
`ExpressionParser(java.lang.String s)` Utility shortcut for parsing strings => just wrap in an StreamReader

Method Summary
`void`	`addClass(java.lang.Class c)`
`void`	`Addition()`
`void`	`addVariable(VariableDefinition v)`
`void`	`BooleanTest()`
`java.util.Iterator`	`classesIterator()`
`void`	`disable_tracing()`
`void`	`enable_tracing()`
`void`	`Expression()`
`void`	`FunctionCall()`
`ParseException`	`generateParseException()`
`Token`	`getNextToken()`
`Token`	`getToken(int index)`
`void`	`LogicalOperation()`
`protected void`	`lookupMethods(java.lang.Class c)` Utility function to lookup the methods of the given class and add them to the method cache.
`static void`	`main(java.lang.String[] args)`
`void`	`MonoBlock()`
`void`	`Multiplication()`
`void`	`Number()`
`ExpressionNode`	`parse()` External call non-static API => returns the root node of the parse tree
`void`	`Power()`
`void`	`ReInit(ExpressionParserTokenManager tm)`
`void`	`ReInit(java.io.InputStream stream)`
`void`	`ReInit(java.io.Reader stream)`
`void`	`removeClass(java.lang.Class c)`
`void`	`removeVariable(VariableDefinition v)`
`void`	`UnaryOperation()`
`void`	`UnaryOperator()`
`java.util.Iterator`	`variableIterator()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

jjtree

protected jsynoptic.parser.JJTExpressionParserState jjtree

variables

protected java.util.Vector variables

The mechanism to decide between functions or variables is as follow : We maintain a list of variables : this is a java.util.Vector of objects implementing the Variable interface. The variable name is matched at parse time. A vector of Class is also maintained. Introspection is done at parse time, to check the function name in the expression with public static functions in these classes. The signature must also be compatible with the expression (ex: number of arguments). By default java.lang.Math is included in the vector, but of course you may add more user-defined classes. Once parsed, the Node for the function call will keep the reference of the variable or class method. Thus the expression evaluation is quite fast and does not use introspection at all.

classes

protected java.util.Vector classes

methods

protected java.util.Vector methods

token_source

public ExpressionParserTokenManager token_source

token

public Token token

jj_nt

public Token jj_nt

lookingAhead

public boolean lookingAhead

Constructor Detail