edu.uky.rch.ept.data.filesystem.cxpath
Class Parser

java.lang.Object
  edu.uky.rch.ept.data.filesystem.cxpath.Parser

public class Parser

extends Object

Utility class for parsing concurrent XPath expressions. The expressions match the following grammar; forms marked with {braces} indicate currently unimplemented features.

• expression => locationPath
• locationPath => absLocPath | {relLocPath}
• absLocPath => '/' relLocPath | '//' relLocPath
• relLocPath => step | relLocPath '/' step | relLocPath '//' step
• step => {'.' | '..'} | axisSpec nodeTest {predicate*}
• axisSpec => AXIS_NAME '::' | AT | \epsilon
• nodeTest => '*' | NAME | {NS ':' '*' | NS ':' NAME | NODE_TYPE '(' ')'}
• predicate => {'[' expression ']'}

TODO: generate a parser with ANTLR or such. TODO: support full XPath syntax.

Author:

neil

Constructor Summary

Parser()

Method Summary

static LocationStep[]

parse(String expr) Parse a concurrent XPath expression into its component LocationSteps.

Methods inherited from class java.lang.Object

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

Constructor Detail

Parser

public Parser()

Method Detail

parse

public static LocationStep[] parse(String expr)
                            throws CXPathException

Parse a concurrent XPath expression into its component LocationSteps.

Parameters:

expr - the expression to parse; must be a location path.

Returns:

Returns an array representing the location steps in the expression.

Throws:

CXPathException - if there is an error parsing the expression.