eu.bandm.tools.xslt.base

Class AttributeValueTemplate

java.lang.Object

eu.bandm.tools.xslt.base.AttributeValueTemplate

public class AttributeValueTemplate
extends Object

Parses an xslt "attribute value template" into an xpath expression with explicit string operations. So the follwing are equivalent xslt expressions (read [] for angle brackets):

   [x:y z="a{{bc{def(g)}" /]
        --->
   [x][xsl:attribute name="z" value="concat('a{bc', string(def(g))"][/x]
  

Iff syntax errors occur, error messages are sent and null is returned.
If no escape-curly-brace occurs, one single TPath.Literal is returned.
Otherwise one(1) TPath.FunctionCall to "string()" or to "concat()", on many of these both.

Field Summary

Fields

Modifier and Type	Field and Description
static char	brace_close
static char	brace_open
static String	fn_concat
static String	fn_tostring

Constructor Summary

Constructors

Constructor and Description
AttributeValueTemplate()

Method Summary

Modifier and Type	Method and Description
protected void	error(String s)
protected void	flushBuffer()
static void	main(String[] args)
protected boolean	parse_tpath() ATTENTION The "end element" semantic action at the end of the "braced expr" parsing method is fed into a sax event queue.
TPath.Expr	parse(String s, MessageReceiver<SimpleMessage<XMLDocumentIdentifier>> msg) accumulate constant character data in Stringbuilder "konst" or call tpath parser.

Methods inherited from class java.lang.Object

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

Field Detail

brace_open

public static final char brace_open

See Also:

Constant Field Values

brace_close

public static final char brace_close

See Also:

Constant Field Values

fn_tostring

public static final String fn_tostring

See Also:

Constant Field Values

fn_concat

public static final String fn_concat

See Also:

Constant Field Values

Constructor Detail

AttributeValueTemplate

public AttributeValueTemplate()

Method Detail

parse_tpath

protected boolean parse_tpath()

ATTENTION The "end element" semantic action at the end of the "braced expr" parsing method is fed into a sax event queue. The "enqueue()" function therein calls the "getlinenumber()" callback. This triggers a "get token = LT()", which causes the consumption on the character stream, which must be un-done, because after the xantlr lexer the hand-written code must consume the next chars without any loss.

flushBuffer

protected void flushBuffer()

error

protected void error(String s)

parse

public TPath.Expr parse(String s,
                        MessageReceiver<SimpleMessage<XMLDocumentIdentifier>> msg)

accumulate constant character data in Stringbuilder "konst" or call tpath parser. The results of both variants are zipped into "result" and at last combined in a call to string-concat, iff necessary.

main

public static void main(String[] args)