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[WIP] robustify TOC headline finding

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This commit is contained in:
Johannes Zillmann 2017-03-16 06:01:07 +01:00
parent dbd9d8bf5f
commit a9b851ceb6
1 changed files with 60 additions and 34 deletions
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94
src/javascript/models/transformations/textitem/DetectTOC.jsx
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@ -113,21 +113,22 @@ export default class DetectTOC extends ToTextItemTransformation {
});
// Add linked headers
const pageMapping = detectPageMappingNumber(parseResult.pages.filter(page => page.index > lastTocPage.index), tocLinks);
tocLinks.forEach(tocLink => {
var linkedPage = parseResult.pages[tocLink.pageNumber - 1];
var foundHeadline = false;
var linkedPage = parseResult.pages[tocLink.pageNumber + pageMapping];
var foundHealineItems;
if (linkedPage) {
foundHeadline = findAndAddHeadline(linkedPage, tocLink, headlineTypeToHeightRange);
if (!foundHeadline) { // pages are off by 1 ?
linkedPage = parseResult.pages[tocLink.pageNumber];
foundHealineItems = findHeadlineItems(linkedPage, tocLink.textItem.text);
if (!foundHealineItems) { // pages are off by 1 ?
linkedPage = parseResult.pages[tocLink.pageNumber + pageMapping + 1];
if (linkedPage) {
foundHeadline = findAndAddHeadline(linkedPage, tocLink, headlineTypeToHeightRange);
foundHealineItems = findHeadlineItems(linkedPage, tocLink.textItem.text);
}
}
} else {
//TODO sometimes pages are off. We could try the page range from pre to next ...
}
if (!foundHeadline) {
if (foundHealineItems) {
addHeadlineItems(linkedPage, tocLink, foundHealineItems, headlineTypeToHeightRange)
} else {
notFoundHeadlines.push(tocLink);
}
});
@ -192,8 +193,27 @@ export default class DetectTOC extends ToTextItemTransformation {
}
function findAndAddHeadline(page, tocLink, headlineTypeToHeightRange) {
const headline = tocLink.textItem.text;
//Find out how the TOC page link actualy translates to the page.index
function detectPageMappingNumber(pages, tocLinks) {
for ( var tocLink of tocLinks ) {
const page = findPageWithHeadline(pages, tocLink.textItem.text);
if (page) {
return page.index - tocLink.pageNumber;
}
}
return null;
}
function findPageWithHeadline(pages, headline) {
for ( var page of pages ) {
if (findHeadlineItems(page, headline)) {
return page;
}
}
return null;
}
function findHeadlineItems(page, headline) {
const headlineFinder = new HeadlineFinder({
headline: headline
});
@ -201,32 +221,38 @@ function findAndAddHeadline(page, tocLink, headlineTypeToHeightRange) {
for ( var line of page.items ) {
const headlineItems = headlineFinder.consume(line);
if (headlineItems) {
headlineItems.forEach(item => item.annotation = REMOVED_ANNOTATION);
const headlineType = headlineByLevel(tocLink.level + 2);
const headlineHeight = headlineItems.reduce((max, item) => Math.max(max, item.height), 0);
page.items.splice(lineIndex + 1, 0, new TextItem({
...headlineItems[0],
text: headline,
height: headlineHeight,
type: headlineType,
annotation: ADDED_ANNOTATION
}));
var range = headlineTypeToHeightRange[headlineType];
if (range) {
range.min = Math.min(range.min, headlineHeight);
range.max = Math.max(range.max, headlineHeight);
} else {
range = {
min: headlineHeight,
max: headlineHeight
};
headlineTypeToHeightRange[headlineType] = range;
}
return true;
return {
lineIndex: lineIndex,
headlineItems: headlineItems
};
}
lineIndex++;
}
return false;
return null;
}
function addHeadlineItems(page, tocLink, foundItems, headlineTypeToHeightRange) {
foundItems.headlineItems.forEach(item => item.annotation = REMOVED_ANNOTATION);
const headlineType = headlineByLevel(tocLink.level + 2);
const headlineHeight = foundItems.headlineItems.reduce((max, item) => Math.max(max, item.height), 0);
page.items.splice(foundItems.lineIndex + 1, 0, new TextItem({
...foundItems.headlineItems[0],
text: tocLink.textItem.text,
height: headlineHeight,
type: headlineType,
annotation: ADDED_ANNOTATION
}));
var range = headlineTypeToHeightRange[headlineType];
if (range) {
range.min = Math.min(range.min, headlineHeight);
range.max = Math.max(range.max, headlineHeight);
} else {
range = {
min: headlineHeight,
max: headlineHeight
};
headlineTypeToHeightRange[headlineType] = range;
}
}
function findHeadlinesBySize(pages, tocLink, heightRange, fromPage, toPage) {