Parser

java.lang.Object
- org.vedantatree.expressionoasis.Parser

```
public final class Parser
extends Object
```
This parser object parses the expressions, break these in expression tokens and perform lexical analysis on these tokens. All kind of expressions can be parsed like arithmetic, function call, and property accessor etc. By default, it ignores the extra blanks.

Some examples of expression

1). 123 + 124 - 67 * 45 div 90 + (12 + 34 div 67) .
2). principal * pow(( 1 - rate div 100 ), time) .
3). 120 * pow(sin(20) div tan(30), 2) .
4). values[0] + values[1] + values[2] + 120 * 45 div num[1][1] .
5). person.address.city.name + students[0].rollNo .
6). /person/address/city/name + /person/children[name='Ram'] + /person/children[1] .
7). abc=xyz || 1!=2 && 3 >= xyz && xvz <= 30 .

Constructor Summary

Constructors
Constructor	Description
`Parser()`	Deprecated. seems of no use, since Parser is always created from Compiler with Grammar instance
`Parser(Grammar grammar)`	Constructs the Parser with given DefaultXMLGrammar object

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`main(String[] args)`
`List<ExpressionToken>`	`parse(String expression)`	It parses the given expression string into ExpressionToken objects and returns the list of ExpressionTokens.

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

- Constructor Detail
  - Parser
```
public Parser()
```
    Deprecated.
    seems of no use, since Parser is always created from Compiler with Grammar instance
    
    Constructs the Parser with default DefaultXMLGrammar instance
  - Parser
```
public Parser(Grammar grammar)
```
    Constructs the Parser with given DefaultXMLGrammar object
    
    Parameters:
    
    grammar - the grammar using which it parse the expression.
    
    Throws:
    
    IllegalArgumentException - if the grammar is null.
- Method Detail
  - parse
```
public final List<ExpressionToken> parse(String expression)
                                  throws ExpressionEngineException
```
    It parses the given expression string into ExpressionToken objects and returns the list of ExpressionTokens.
    
    Parameters:
    
    expression - the expression string to parse
    
    Returns:
    
    list of ExpressionToken
    
    Throws:
    
    ExpressionEngineException - if unable to parse
    
    IllegalArgumentException - if the expression is not a qualified string
  - main
```
public static void main(String[] args)
                 throws ExpressionEngineException
```
    Throws:
    
    ExpressionEngineException