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Merge pull request #10185 from Snuffleupagus/find-less-normalization

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Reduce the number of redundant text normalization operations in `PDFFindController`
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Tim van der Meij 2018-10-28 13:31:15 +01:00 committed by GitHub
commit a77ac5fa23
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 27 additions and 14 deletions
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41
web/pdf_find_controller.js
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@ -40,6 +40,18 @@ const CHARACTERS_TO_NORMALIZE = {
'\u00BE': '3/4', // Vulgar fraction three quarters
};
let normalizationRegex = null;
function normalize(text) {
if (!normalizationRegex) {
// Compile the regular expression for text normalization once.
const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
normalizationRegex = new RegExp(`[${replace}]`, 'g');
}
return text.replace(normalizationRegex, function(ch) {
return CHARACTERS_TO_NORMALIZE[ch];
});
}
/**
* @typedef {Object} PDFFindControllerOptions
* @property {IPDFLinkService} linkService - The navigation/linking service.
@ -59,10 +71,6 @@ class PDFFindController {
this._reset();
eventBus.on('findbarclose', this._onFindBarClose.bind(this));
// Compile the regular expression for text normalization once.
const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
this._normalizationRegex = new RegExp(`[${replace}]`, 'g');
}
get highlightMatches() {
@ -152,7 +160,7 @@ class PDFFindController {
matchIdx: null,
};
this._extractTextPromises = [];
this._pageContents = []; // Stores the text for each page.
this._pageContents = []; // Stores the normalized text for each page.
this._matchesCountTotal = 0;
this._pagesToSearch = null;
this._pendingFindMatches = Object.create(null);
@ -164,10 +172,15 @@ class PDFFindController {
this._firstPageCapability = createPromiseCapability();
}
_normalize(text) {
return text.replace(this._normalizationRegex, function(ch) {
return CHARACTERS_TO_NORMALIZE[ch];
});
/**
* @return {string} The (current) normalized search query.
*/
get _query() {
if (this._state.query !== this._rawQuery) {
this._rawQuery = this._state.query;
this._normalizedQuery = normalize(this._state.query);
}
return this._normalizedQuery;
}
/**
@ -304,8 +317,8 @@ class PDFFindController {
}
_calculateMatch(pageIndex) {
let pageContent = this._normalize(this._pageContents[pageIndex]);
let query = this._normalize(this._state.query);
let pageContent = this._pageContents[pageIndex];
let query = this._query;
const { caseSensitive, entireWord, phraseSearch, } = this._state;
if (query.length === 0) {
@ -362,8 +375,8 @@ class PDFFindController {
strBuf.push(textItems[j].str);
}
// Store the page content (text items) as one string.
this._pageContents[i] = strBuf.join('');
// Store the normalized page content (text items) as one string.
this._pageContents[i] = normalize(strBuf.join(''));
extractTextCapability.resolve(i);
}, (reason) => {
console.error(`Unable to get text content for page ${i + 1}`, reason);
@ -423,7 +436,7 @@ class PDFFindController {
}
// If there's no query there's no point in searching.
if (this._state.query === '') {
if (this._query === '') {
this._updateUIState(FindState.FOUND);
return;
}