101 lines
3.3 KiB
JavaScript
101 lines
3.3 KiB
JavaScript
/**
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* LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
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* Copyright (C) 2021-2024 Ad5001
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import { TMP, existsSync, writeFileSync } from "./fs.mjs"
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const PIXEL = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQAAAAA3bvkkAAAACklEQVR4AWNgAAAAAgABc3UBGAAAAABJRU5ErkJggg=="
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export class MockLatex {
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constructor() {
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this.supportsAsyncRender = true
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}
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/**
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* Creates a simple string hash.
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* @param {string} string
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* @return {number}
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* @private
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*/
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__hash(string) {
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let hash = 0
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let i, chr
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if(string.length === 0) return hash
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for(i = 0; i < string.length; i++) {
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chr = string.charCodeAt(i)
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hash = ((hash << 5) - hash) + chr
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hash |= 0 // Convert to 32bit integer
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}
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return hash
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}
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/**
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*
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* @param {string} markup
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* @param {number} fontSize
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* @param {string} color
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* @return {string}
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* @private
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*/
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__getFileName(markup, fontSize, color) {
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const name = this.__hash(`${markup}_${fontSize}_${color}`)
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return `${TMP}/${name}.png`
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}
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/**
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* @param {string} markup - LaTeX markup to render
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* @param {number} fontSize - Font size (in pt) to render
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* @param {string} color - Color of the text to render
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* @returns {Promise<string>} - Comma separated data of the image (source, width, height)
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*/
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async renderAsync(markup, fontSize, color) {
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return this.renderSync(markup, fontSize, color)
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}
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/**
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* @param {string} markup - LaTeX markup to render
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* @param {number} fontSize - Font size (in pt) to render
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* @param {string} color - Color of the text to render
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* @returns {string} - Comma separated data of the image (source, width, height)
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*/
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renderSync(markup, fontSize, color) {
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const file = this.__getFileName(markup, fontSize, color)
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writeFileSync(file, PIXEL, "base64")
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return `${file},1,1`
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}
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/**
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* @param {string} markup - LaTeX markup to render
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* @param {number} fontSize - Font size (in pt) to render
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* @param {string} color - Color of the text to render
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* @returns {string} - Comma separated data of the image (source, width, height)
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*/
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findPrerendered(markup, fontSize, color) {
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const file = this.__getFileName(markup, fontSize, color)
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if(existsSync(file))
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return `${file},1,1`
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return ""
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}
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/**
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* Checks if the Latex installation is valid
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* @returns {boolean}
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*/
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checkLatexInstallation() {
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return true // We're not *actually* doing any latex.
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}
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}
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