java - Jython - how can I merge two LeafElements in a DefaultStyledDocument? -

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i'm trying "normalise" defaultstyleddocument subclass, in sense have org.w3c.dom.node.normalize(): is, merge adjoining text "leaves". in case of defaultstyleddocument these leaves identified merging if 2 adjacent ones have same attributes (or none).

below simple version (we don't check actual attributes: use-case either have plain text, or text 1 possible mark-up style).

def normalise( self ):     # recursive function:     def normalise_structure( el, depth = 0 ):         indent = '  ' * depth         start = el.startoffset         print( '%s# el %s |%s|' % ( indent, el, self.gettext( start, el.endoffset - start )))         prev_attr_set = none         in range( el.elementcount ):             subelement = el.getelement( )             normalise_structure( subelement, depth + 1 )             if subelement.leaf:                 curr_attr_set = subelement.attributes                 print( '%s  # leaf, attribs %s' % ( indent, curr_attr_set, ))                 # simple version: works if there 1 possible attribute                 if prev_attr_set , curr_attr_set , prev_attr_set.attributecount == curr_attr_set.attributecount:                     print( '%s  # %s leaf needs merged previous leaf' % (                                  indent, 'marked-up' if prev_attr_set.attributecount == 1 else 'plain'))                     attr_set = prev_attr_set.getelement( 0 ) if prev_attr_set.attributecount else none                     prev_subelement = el.getelement( - 1 )                     prev_start = prev_subelement.startoffset                     curr_end = subelement.endoffset                     merged_element = javax.swing.text.abstractdocument.leafelement(                          javax.swing.text.defaultstyleddocument(), el, attr_set, prev_start, curr_end  )                     el.replace( prev_start, curr_end - prev_start, [ merged_element ] )                 prev_attr_set = curr_attr_set             else:                 print( '%s  # not leaf...' % ( indent, ))                 prev_attr_set = none     self_el in self.rootelements:         normalise_structure( self_el )

when run error:

exception in thread "awt-eventqueue-0" java.lang.arrayindexoutofboundsexception @ java.lang.system.arraycopy(native method) @ javax.swing.text.abstractdocument$branchelement.replace(abstractdocument.java:2290)

i hasten add that, before trying javax.swing.text.defaultstyleddocument() param 1 in leafelement constructor tried "self" (i.e. defaultstyleddocument invokes normalise on line one): same error.

yes, possible do:

abstractdocument.branchelement.replace() looks this:

public void replace(int offset, int length, element[] elems)   ...

turns out "offset" , "length" here refer sub-elements of branchelement (typically leafelements), not offset , length of underlying text in styleddocument.

somebody cleverer me have got earlier. api documentation (java 7) might make bit clearer....


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