108 lines
2.7 KiB
TypeScript
108 lines
2.7 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2019-2022 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Implements the FontCache object for SVG output
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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import {SVG} from '../svg.js';
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export class FontCache<N, T, D> {
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/**
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* The SVG jax that owsn this cache
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*/
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protected jax: SVG<N, T, D>;
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/**
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* The cache of font character IDs to their paths
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*/
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protected cache: Map<string, string> = new Map();
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/**
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* The SVG <defs> element for storing the cache
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*/
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protected defs: N = null;
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/**
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* A string to use to make per-equation cache IDs unique
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*/
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protected localID: string = '';
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/**
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* A number used to make localID values to use for each equation
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*/
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protected nextID: number = 0;
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/**
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* @param {SVG} jax The SVG jax owning this font cache
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*/
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constructor(jax: SVG<N, T, D>) {
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this.jax = jax;
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}
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/**
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* Cache a character from a particular variant and return the cache ID
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*
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* @param {string} variant The variant name for the character
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* @param {string} C The character to be cached
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* @param {string} path The SVG path data for the character
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* @return {string} The id for the cached <path> element
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*/
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public cachePath(variant: string, C: string, path: string): string {
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const id = 'MJX-' + this.localID + (this.jax.font.getVariant(variant).cacheID || '') + '-' + C;
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if (!this.cache.has(id)) {
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this.cache.set(id, path);
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this.jax.adaptor.append(this.defs, this.jax.svg('path', {id: id, d: path}));
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}
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return id;
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}
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/**
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* Clear the localID value
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*/
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public clearLocalID() {
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this.localID = '';
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}
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/**
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* Use a localID (for font-specific caching), either with a specific string,
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* or from the nextID number.
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*/
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public useLocalID(id: string = null) {
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this.localID = (id == null ? ++this.nextID : id) + (id === '' ? '' : '-');
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}
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/**
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* Clear the cache
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*/
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public clearCache() {
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this.cache = new Map();
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this.defs = this.jax.svg('defs');
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}
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/**
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* Return the font cache <defs> element
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*/
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public getCache() {
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return this.defs;
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}
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}
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