Sakurai/pdf.js
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Change let to const where possible in the find controller

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Doing so clearly indicates which variables are read-only and may not be
mutated, which helps readability and prevents subtle issues.
This commit is contained in:
Tim van der Meij 2018-09-12 15:25:46 +02:00
parent 38c9f5fc24
commit ede414554e
No known key found for this signature in database
GPG Key ID: 8C3FD2925A5F2762
1 changed files with 40 additions and 39 deletions
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79
web/pdf_find_controller.js
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@ -57,8 +57,8 @@ class PDFFindController {
this.reset();
// Compile the regular expression for text normalization once.
let replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
this._normalizationRegex = new RegExp('[' + replace + ']', 'g');
const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
this._normalizationRegex = new RegExp(`[${replace}]`, 'g');
}
get pageMatches() {
@ -141,7 +141,7 @@ class PDFFindController {
updateMatchPosition(pageIndex, matchIndex, elements, beginIdx) {
if (this.selected.matchIdx === matchIndex &&
this.selected.pageIdx === pageIndex) {
let spot = {
const spot = {
top: FIND_SCROLL_OFFSET_TOP,
left: FIND_SCROLL_OFFSET_LEFT,
};
@ -151,7 +151,7 @@ class PDFFindController {
}
_normalize(text) {
return text.replace(this._normalizationRegex, function (ch) {
return text.replace(this._normalizationRegex, function(ch) {
return CHARACTERS_TO_NORMALIZE[ch];
});
}
@ -164,8 +164,8 @@ class PDFFindController {
*/
_prepareMatches(matchesWithLength, matches, matchesLength) {
function isSubTerm(matchesWithLength, currentIndex) {
let currentElem = matchesWithLength[currentIndex];
let nextElem = matchesWithLength[currentIndex + 1];
const currentElem = matchesWithLength[currentIndex];
const nextElem = matchesWithLength[currentIndex + 1];
// Check for cases like "TAMEd TAME".
if (currentIndex < matchesWithLength.length - 1 &&
@ -176,7 +176,7 @@ class PDFFindController {
// Check for cases like "thIS IS".
for (let i = currentIndex - 1; i >= 0; i--) {
let prevElem = matchesWithLength[i];
const prevElem = matchesWithLength[i];
if (prevElem.skipped) {
continue;
}
@ -231,8 +231,9 @@ class PDFFindController {
}
_calculatePhraseMatch(query, pageIndex, pageContent, entireWord) {
let matches = [];
let queryLen = query.length;
const matches = [];
const queryLen = query.length;
let matchIdx = -queryLen;
while (true) {
matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
@ -248,12 +249,14 @@ class PDFFindController {
}
_calculateWordMatch(query, pageIndex, pageContent, entireWord) {
let matchesWithLength = [];
const matchesWithLength = [];
// Divide the query into pieces and search for text in each piece.
let queryArray = query.match(/\S+/g);
const queryArray = query.match(/\S+/g);
for (let i = 0, len = queryArray.length; i < len; i++) {
let subquery = queryArray[i];
let subqueryLen = subquery.length;
const subquery = queryArray[i];
const subqueryLen = subquery.length;
let matchIdx = -subqueryLen;
while (true) {
matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);
@ -289,12 +292,9 @@ class PDFFindController {
_calculateMatch(pageIndex) {
let pageContent = this._normalize(this._pageContents[pageIndex]);
let query = this._normalize(this._state.query);
let caseSensitive = this._state.caseSensitive;
let phraseSearch = this._state.phraseSearch;
const entireWord = this._state.entireWord;
let queryLen = query.length;
const { caseSensitive, entireWord, phraseSearch, } = this._state;
if (queryLen === 0) {
if (query.length === 0) {
// Do nothing: the matches should be wiped out already.
return;
}
@ -332,22 +332,23 @@ class PDFFindController {
let promise = Promise.resolve();
for (let i = 0, ii = this._pdfViewer.pagesCount; i < ii; i++) {
let extractTextCapability = createPromiseCapability();
const extractTextCapability = createPromiseCapability();
this._extractTextPromises[i] = extractTextCapability.promise;
promise = promise.then(() => {
return this._pdfViewer.getPageTextContent(i).then((textContent) => {
let textItems = textContent.items;
let strBuf = [];
const textItems = textContent.items;
const strBuf = [];
for (let j = 0, jj = textItems.length; j < jj; j++) {
strBuf.push(textItems[j].str);
}
// Store the pageContent as a string.
// Store the page content (text items) as one string.
this._pageContents[i] = strBuf.join('');
extractTextCapability.resolve(i);
}, (reason) => {
console.error(`Unable to get page ${i + 1} text content`, reason);
console.error(`Unable to get text content for page ${i + 1}`, reason);
// Page error -- assuming no text content.
this._pageContents[i] = '';
extractTextCapability.resolve(i);
@ -364,16 +365,16 @@ class PDFFindController {
this._pdfViewer.currentPageNumber = index + 1;
}
let page = this._pdfViewer.getPageView(index);
const page = this._pdfViewer.getPageView(index);
if (page.textLayer) {
page.textLayer.updateMatches();
}
}
_nextMatch() {
let previous = this._state.findPrevious;
let currentPageIndex = this._pdfViewer.currentPageNumber - 1;
let numPages = this._pdfViewer.pagesCount;
const previous = this._state.findPrevious;
const currentPageIndex = this._pdfViewer.currentPageNumber - 1;
const numPages = this._pdfViewer.pagesCount;
this.active = true;
@ -384,9 +385,9 @@ class PDFFindController {
this._offset.pageIdx = currentPageIndex;
this._offset.matchIdx = null;
this._resumePageIdx = null;
this._pageMatches = [];
this._matchesCountTotal = 0;
this._pageMatches.length = 0;
this._pageMatchesLength = null;
this._matchesCountTotal = 0;
for (let i = 0; i < numPages; i++) {
// Wipe out any previously highlighted matches.
@ -414,13 +415,13 @@ class PDFFindController {
return;
}
let offset = this._offset;
const offset = this._offset;
// Keep track of how many pages we should maximally iterate through.
this._pagesToSearch = numPages;
// If there's already a `matchIdx` that means we are iterating through a
// page's matches.
if (offset.matchIdx !== null) {
let numPageMatches = this._pageMatches[offset.pageIdx].length;
const numPageMatches = this._pageMatches[offset.pageIdx].length;
if ((!previous && offset.matchIdx + 1 < numPageMatches) ||
(previous && offset.matchIdx > 0)) {
// The simple case; we just have advance the matchIdx to select
@ -439,9 +440,9 @@ class PDFFindController {
}
_matchesReady(matches) {
let offset = this._offset;
let numMatches = matches.length;
let previous = this._state.findPrevious;
const offset = this._offset;
const numMatches = matches.length;
const previous = this._state.findPrevious;
if (numMatches) {
// There were matches for the page, so initialize `matchIdx`.
@ -472,7 +473,7 @@ class PDFFindController {
let matches = null;
do {
let pageIdx = this._offset.pageIdx;
const pageIdx = this._offset.pageIdx;
matches = this._pageMatches[pageIdx];
if (!matches) {
// The matches don't exist yet for processing by `_matchesReady`,
@ -484,8 +485,8 @@ class PDFFindController {
}
_advanceOffsetPage(previous) {
let offset = this._offset;
let numPages = this._extractTextPromises.length;
const offset = this._offset;
const numPages = this._extractTextPromises.length;
offset.pageIdx = (previous ? offset.pageIdx - 1 : offset.pageIdx + 1);
offset.matchIdx = null;
@ -499,11 +500,11 @@ class PDFFindController {
_updateMatch(found = false) {
let state = FindState.NOT_FOUND;
let wrapped = this._offset.wrapped;
const wrapped = this._offset.wrapped;
this._offset.wrapped = false;
if (found) {
let previousPage = this._selected.pageIdx;
const previousPage = this._selected.pageIdx;
this.selected.pageIdx = this._offset.pageIdx;
this.selected.matchIdx = this._offset.matchIdx;
state = (wrapped ? FindState.WRAPPED : FindState.FOUND);