Package 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 escaping-curly-brace occurs, one single TPath.Literal is returned. Otherwise one(1) TPath.FunctionCall to "string()" or to "concat()", on multiple of these both.

Each instance is a one-usage-only parser.

Field Summary

Fields

Modifier and Type	Field	Description
static final char	brace_close
static final char	brace_open
(package private) antlr.CharBuffer	cb
static final String	fn_concat
static final String	fn_tostring
(package private) StringBuilder	konst
(package private) MessageCounter	mcnt
(package private) MessageTee<SimpleMessage<XMLDocumentIdentifier>>	msg
(package private) final List<TPath.Expr>	result

Constructor Summary

Constructors

Constructor	Description
AttributeValueTemplate()

Method Summary

Modifier and Type	Method	Description
protected void	error(String s)
protected void	flushBuffer()
static void	main(String[] args)
TPath.Expr	parse(String s, MessageReceiver<SimpleMessage<XMLDocumentIdentifier>> msg)	Accumulate constant character data in Stringbuilder konst or call a tpath parser.
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.

Methods inherited from class java.lang.Object

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

Field Details

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

cb

antlr.CharBuffer cb

konst

StringBuilder konst

result

final List<TPath.Expr> result

mcnt

MessageCounter mcnt

msg

MessageTee<SimpleMessage<XMLDocumentIdentifier>> msg

Constructor Details

AttributeValueTemplate

public AttributeValueTemplate()

Method Details

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 a tpath parser. Both operate on the same CharBuffer and share its read pointer. The results of both cases are zipped into "result" and finally combined in a call to tpath »string-concat()«, iff necessary.

main

public static void main(String[] args)