Package eu.bandm.tools.d2d2.base

Class XsltInstance

java.lang.Object

eu.bandm.tools.d2d2.base.XsltInstance

public class XsltInstance
extends Object

Instantiates the generic d2d xslt module definition for some particular target doctype. Create one instance for each target format and invoke prepareXsltMode().

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	XsltInstance.CollectAllElements	Collect all elements which can appear in an xslt template spontaneously on the top level of a template content, because they are reachable elements of the target text format.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final @Opt XRegExp	toplevelXRegExp	The definition from which all possible (elements and attributes are reachable.
static final String	xslt_generic_tag_for_backend_elements	Tag which appears in the d2d xslt module definition as placeholder for target format elements.
static final String	xslt_modulename	Name of the generic d2d xslt module definition.
static final String	xslt_tag_toplevel	The tag used for the top-level element of an xslt program.
static final String	xslt_tag_ubiquituous	Name of an element definition in the d2d xslt module which or-s all xslt elements which can appear anywhere in a result elements contents.

Constructor Summary

Constructors

Constructor	Description
XsltInstance(MessageReceiver<SimpleMessage<XMLDocumentIdentifier>> msg, int tracelevel, ModuleRegistry moduleRegistry, @Opt XRegExp toplevelXRegExp)

Method Summary

Modifier and Type	Method	Description
protected void	errorcheck_xsltprepare(MessageCounter cnt)	Ensures that no errors (= no LL-1-violation-errors) have happend when resolving the combined definitions of xslt and target.
(package private) Expression	get_xslt_alt_ubiquituous()	The alternative of all xslt expressions which can appear anyhere in a target format element.
(package private) Expression	get_xslt_alt_ubiquituous_repeated()	A "star" repetition wrapped around xslt_alt_ubiquituous.
protected void	hint(String text, Object... args)	Emits a hint message iff tracelevel >0.
static Alt	makealt(Collection<Reference> subs)	Wraps the argument in an "alt" expression.
protected Module	prepareXsltMode()	The insertion of the target language classes into the content-containing xslt elements is done by once modifying the (copy of the) xslt definition module.
protected Module	prepareXsltMode_text()	For text mode the xslt module can be used directly, no rewriting is necessary but eliminating "xslt:RESULT_ELEMENTS"
protected void	warning(String text, Object... args)	Emits a warning message iff tracelevel >0.

Methods inherited from class java.lang.Object

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

Field Details

xslt_modulename

public static final String xslt_modulename

Name of the generic d2d xslt module definition.

See Also:

• Constant Field Values

xslt_generic_tag_for_backend_elements

public static final String xslt_generic_tag_for_backend_elements

Tag which appears in the d2d xslt module definition as placeholder for target format elements.

See Also:

• Constant Field Values

xslt_tag_toplevel

public static final String xslt_tag_toplevel

The tag used for the top-level element of an xslt program. The standard allows two variants, we support only one of these.

See Also:

• Constant Field Values

xslt_tag_ubiquituous

public static final String xslt_tag_ubiquituous

Name of an element definition in the d2d xslt module which or-s all xslt elements which can appear anywhere in a result elements contents.

See Also:

• Constant Field Values

toplevelXRegExp

@Opt
final @Opt XRegExp toplevelXRegExp

The definition from which all possible (elements and attributes are reachable.

Constructor Details

XsltInstance

XsltInstance(MessageReceiver<SimpleMessage<XMLDocumentIdentifier>> msg,
 int tracelevel,
 ModuleRegistry moduleRegistry,
 @Opt
 @Opt XRegExp toplevelXRegExp)

Method Details

makealt

public static Alt makealt(Collection<Reference> subs)

Wraps the argument in an "alt" expression.

get_xslt_alt_ubiquituous

Expression get_xslt_alt_ubiquituous()

The alternative of all xslt expressions which can appear anyhere in a target format element.

get_xslt_alt_ubiquituous_repeated

Expression get_xslt_alt_ubiquituous_repeated()

A "star" repetition wrapped around xslt_alt_ubiquituous.

hint

protected void hint(String text,
 Object... args)

Emits a hint message iff tracelevel >0.

warning

protected void warning(String text,
 Object... args)

Emits a warning message iff tracelevel >0.

prepareXsltMode

protected Module prepareXsltMode()

The insertion of the target language classes into the content-containing xslt elements is done by once modifying the (copy of the) xslt definition module.

Each reference to xslt_generic_tag_for_backend_elements == "RESULT_ELEMENTS" is hard rewritten to "(#chars|A|B|C)*", with "A", "B", etc. being all reachable target model element tags. (The XSLT specification implies that only Element tags, not Attribute tags, can appear in this "free floating" way.)

All xslt-tags which appear in the xslt syntax (d2d-form!) as an alterative to RESULT_ELEMENTS thus compete/conflict with these target tags. The only place is the rule tags TEMPLATE = (#chars | @INSTRUCTIONS | @RESULT_ELEMENTS)*
Thus all xslt tags in @CHAR_PRODUCING | @STRUCTURE_PRODUCING | @INTERSPERED_NOTHING_PRODUCING can conflict.
These are: apply | call | apply-imports | foreach | valueof | copy-of | number | choose | if | text | copy | pi | comment | element | attribute | var | message | fallback.

The other direction of inclusion, i.e. the callability of ubiquituous content-producing xslt elements out of target element's content is done dynamically, by special look-up code. See the local "boolean inxslt" in the code of Text2Udom.process_open_tag(String, boolean). These tags are collected in the disjunction expression "INSTRUCTIONS", and thus are (accidentally) the same as in the other direction.

Only those tags will be replaced by prefixed versions on case of conflicts with target tags.

The remaining few other xslt-tags (stylesheet, result_elements, version, extension, import, include,output, key, decimal-format, namspace, priority, match, noescap, value, count, from, format, arg, sort, test, when, other, attribute-set, param, xp) will not be replaced.

prepareXsltMode_text

protected Module prepareXsltMode_text()

For text mode the xslt module can be used directly, no rewriting is necessary but eliminating "xslt:RESULT_ELEMENTS"

errorcheck_xsltprepare

protected void errorcheck_xsltprepare(MessageCounter cnt)

Ensures that no errors (= no LL-1-violation-errors) have happend when resolving the combined definitions of xslt and target. These cannot happen because the xslt tags which conflict have been replaced by non-conflicting prefixed versions.