// Cleanindex.jsx
// This script is meant to clean an imported index
// e.g. from Word for use in InDesign.
// The script does two things:
// 1. When there are several instances of an entry
//    on the same page, all except the first are set to non pronting.
// 2. If there are more than 'minconsecs' instances of the same entry
//    on consecutive pages, the first is set to ForNextNPages
//    and the rest to non printing (the default of minconsecs is 3, 
//    you can change this to 2 in the startup window).
// If a book is open, all files in the book will be handled,
// if no book is open, the active document will be handled.
// Made by Teus de Jong, last version August 28, 2005
if (!doDisplayDialog()){exit()}
if (app.books.length == 0){
	if (app.documents.length == 0){
		errorExit('No documents are open');
	} else {
		nrofdocs = 1;
	}
} else {
	nrofdocs = app.books[0].bookContents.length;
	for (i = nrofdocs - 1; i > -1; i--){
		app.open(File(app.books[0].bookContents[i].fullName));
	}
}
doc = app.activeDocument;
for (d = 1; d <= nrofdocs; d++){
	IndIndex = doc.indexes[0];
	IndIndex.update();
	alltops = IndIndex.allTopics;
	nroftopics = alltops.length;
	if (nroftopics == 0){continue}
	for (i = 0; i <  nroftopics; i++){
		DoTopic(alltops[i]);
	}
	if (d >= nrofdocs){
		break;
	}
	doc = app.open(app.books[0].bookContents[d].fullName);
}  

function DoTopic(IndTopic){
	var i, s;
	var pags = [];
	var indices = [];
	with (IndTopic){
		nrofprefs = pageReferences.length;
		if (nrofprefs < 2){return}
		// make double topics non printing
		for (i = 0; i < nrofprefs - 1; i++){
			pagref1 = pageReferences[i];
			pag1 = GetPageNr(pagref1.sourceText);
			if (i == 0){
				pags.push(pag1);
				indices.push(0);
			}
			pagref2 = pageReferences[i+1];
			pag2 = GetPageNr(pagref2.sourceText);
			if (pag1 == pag2){
				pagref2.pageReferenceType = PageReferenceType.suppressPageNumbers;
			} else {
				indices.push(i+1);
				pags.push(pag2);
			}
		}
		if (nrofprefs < minconsecs){return}
		// make ranges of more than minconsec consecutive pages
		consecs = 0;
		i = 0;
		b = i;
		while (i < pags.length - 1){
			if (pags[i+1] == pags[i]+1){
				consecs++;
				i++;
				if (i < pags.length - 1){
					continue;
				}
			}
			if (consecs >= minconsecs){
				for (j = b + 1; j <= i; j++){
					pageReferences[indices[j]].pageReferenceType = PageReferenceType.suppressPageNumbers;
				}
				pageReferences[indices[b]].pageReferenceType = PageReferenceType.forNextNPages;
				pageReferences[indices[b]].pageReferenceLimit = pags[i] - pags[b] + 1;
			}
			i++;
			consecs = 0; b = i;
		}
			
	}
}

function GetPageNr(txt){
	var pg = txt.parentTextFrames[0].parent;
	while (pg.constructor.name != 'Page'){
		if (pg.constructor.name == 'Character'){
			pg = pg.parentTextFrames[0];
		}
		pg = pg.parent;
		if (pg == null){break}
	}
	if (pg != null){
		return(pg.documentOffset)
	} else {
		alert('Could not get page number; exiting...');
		exit()
	}
}

function errorExit(s){
	alert(s);
	exit();
}

function doDisplayDialog(){
	var i;
	with (theDialog = app.dialogs.add({name:'Minimum number'})){

		with (DialogColumn1 = dialogColumns.add()){

			staticTexts.add({staticLabel:'Minimum number of entries to be combined'});
			with (edmin = radiobuttonGroups.add()){

				radiobuttonControls.add({staticLabel:'2'});
				radiobuttonControls.add({staticLabel:'3', checkedState: true});
			}
		}
		if (show()) {

			minconsecs = edmin.selectedButton + 1;
			destroy;
			return(true);
		}
		else{

			destroy();
			return(false);
		}
	}
}