QuickXPathParser

java.lang.Object
- com.saxonica.ee.optim.QuickXPathParser

All Implemented Interfaces:

XPathParser.Accelerator
```
public class QuickXPathParser
extends java.lang.Object
implements XPathParser.Accelerator
```
This class performs a quick parse of commonly encountered XPath expressions that conform to common syntactic patterns. Instead of using the full recursive-descent parser, the expression is tokenized, and the sequence of tokens is tested against a table of known common sequences. If the XPath expression supplied cannot be parsed (either because it is too complicated or because it is invalid), the quick parser simply returns null and leaves the work to the regular parser.

Constructor Summary

Constructors
Constructor Description

QuickXPathParser()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`parse(Tokenizer t, StaticContext env, java.lang.String expression, int start, int terminator)`	Attempt to parse an expression, provided it is very simple.

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

- Constructor Detail
  - QuickXPathParser
```
public QuickXPathParser()
```
- Method Detail
  - parse
```
public Expression parse(Tokenizer t,
                        StaticContext env,
                        java.lang.String expression,
                        int start,
                        int terminator)
```
    Attempt to parse an expression, provided it is very simple.
    
    Specified by:
    
    parse in interface XPathParser.Accelerator
    
    Parameters:
    
    t - the tokenizer
    
    expression - the string containing expression to be parsed
    
    start - start position within the input string
    
    terminator - either EOF or RCURLY, indicating how parsing should end
    
    env - the static context
    
    Returns:
    
    either the parsed expression, or null if it is erroneous or too complex to parse.