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344
node_modules/mathjax-full/ts/output/common/Wrappers/mmultiscripts.ts
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node_modules/mathjax-full/ts/output/common/Wrappers/mmultiscripts.ts
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/*************************************************************
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*
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* Copyright (c) 2018-2022 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 CommonMmultiscripts wrapper mixin for the MmlMmultiscripts object
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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import {AnyWrapper, Constructor} from '../Wrapper.js';
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import {CommonMsubsup, MsubsupConstructor} from './msubsup.js';
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import {BBox} from '../../../util/BBox.js';
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/*****************************************************************/
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/**
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* The data about the scripts and base
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*/
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export type ScriptData = {
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base: BBox;
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sub: BBox; // combined bbox for all subscripts
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sup: BBox; // combined bbox for all superscripts
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psub: BBox; // combined bbox for all presubscripts
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psup: BBox; // combined bbox for all presuperscripts
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numPrescripts: number;
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numScripts: number;
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};
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export type ScriptDataName = keyof ScriptData;
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/**
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* The lists of all the individual script bboxes
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*/
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export type ScriptLists = {
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base: BBox[];
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subList: BBox[];
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supList: BBox[];
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psubList: BBox[];
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psupList: BBox[];
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};
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export type ScriptListName = keyof ScriptLists;
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/**
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* The type of script that follows the given type
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*/
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export const NextScript: {[key: string]: ScriptListName} = {
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base: 'subList',
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subList: 'supList',
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supList: 'subList',
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psubList: 'psupList',
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psupList: 'psubList',
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};
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/**
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* The names of the scripts (for looping)
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*/
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export const ScriptNames = ['sup', 'sup', 'psup', 'psub'] as ScriptDataName[];
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/*****************************************************************/
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/**
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* The CommonMmultiscripts interface
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*
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* @template W The child-node Wrapper class
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*/
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export interface CommonMmultiscripts<W extends AnyWrapper> extends CommonMsubsup<W> {
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/**
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* The cached data for the various bounding boxes
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*/
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scriptData: ScriptData;
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/**
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* The index of the child following the <mprescripts/> tag
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*/
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firstPrescript: number;
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/**
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* @param {BBox} pre The prescript bounding box
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* @param {BBox} post The postcript bounding box
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* @return {BBox} The combined bounding box
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*/
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combinePrePost(pre: BBox, post: BBox): BBox;
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/**
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* Compute the bounding box information about all the scripts
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*/
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getScriptData(): void;
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/**
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* @return {ScriptLists} The bounding boxes for all the scripts divided into lists by position
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*/
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getScriptBBoxLists(): ScriptLists;
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/**
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* Pad the second list, if it is one short
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*
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* @param {BBox[]} list1 The first list
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* @param {BBox[]} list2 The second list
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*/
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padLists(list1: BBox[], list2: BBox[]): void;
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/**
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* @param {BBox} bbox1 The bbox for the combined subscripts
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* @param {BBox} bbox2 The bbox for the combined superscripts
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* @param {BBox[]} list1 The list of subscripts to combine
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* @param {BBox[]} list2 The list of superscripts to combine
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*/
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combineBBoxLists(bbox1: BBox, bbox2: BBox, list1: BBox[], list2: BBox[]): void;
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/**
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* @param {BBox} bbox The bounding box from which to get the (scaled) width, height, and depth
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*/
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getScaledWHD(bbox: BBox): void;
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}
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/**
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* Shorthand for the CommonMmultiscripts constructor
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*
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* @template W The child-node Wrapper class
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*/
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export type MmultiscriptsConstructor<W extends AnyWrapper> = Constructor<CommonMmultiscripts<W>>;
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/*****************************************************************/
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/**
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* The CommonMmultiscripts wrapper mixin for the MmlMmultiscripts object
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*
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* @template W The child-node Wrapper class
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* @template T The Wrapper class constructor type
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*/
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export function CommonMmultiscriptsMixin<
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W extends AnyWrapper,
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T extends MsubsupConstructor<W>
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>(Base: T): MmultiscriptsConstructor<W> & T {
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return class extends Base {
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/**
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* The cached data for the various bounding boxes
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*/
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public scriptData: ScriptData = null;
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/**
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* The index of the child following the <mprescripts/> tag
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*/
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public firstPrescript = 0;
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/**
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* @override
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*/
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constructor(...args: any[]) {
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super(...args);
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this.getScriptData();
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}
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/*************************************************************/
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/**
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* @param {BBox} pre The prescript bounding box
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* @param {BBox} post The postcript bounding box
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* @return {BBox} The combined bounding box
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*/
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public combinePrePost(pre: BBox, post: BBox): BBox {
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const bbox = new BBox(pre);
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bbox.combine(post, 0, 0);
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return bbox;
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}
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/*************************************************************/
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/**
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* @override
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*/
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public computeBBox(bbox: BBox, recompute: boolean = false) {
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//
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// Get the bounding boxes, and combine the pre- and post-scripts
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// to get a common offset for both
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//
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const scriptspace = this.font.params.scriptspace;
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const data = this.scriptData;
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const sub = this.combinePrePost(data.sub, data.psub);
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const sup = this.combinePrePost(data.sup, data.psup);
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const [u, v] = this.getUVQ(sub, sup);
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//
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// Lay out the pre-scripts, then the base, then the post-scripts
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//
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bbox.empty();
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if (data.numPrescripts) {
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bbox.combine(data.psup, scriptspace, u);
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bbox.combine(data.psub, scriptspace, v);
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}
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bbox.append(data.base);
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if (data.numScripts) {
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const w = bbox.w;
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bbox.combine(data.sup, w, u);
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bbox.combine(data.sub, w, v);
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bbox.w += scriptspace;
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}
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bbox.clean();
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this.setChildPWidths(recompute);
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}
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/**
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* Compute the bounding box information about all the scripts
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*/
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public getScriptData() {
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//
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// Initialize the bounding box data
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//
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const data: ScriptData = this.scriptData = {
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base: null, sub: BBox.empty(), sup: BBox.empty(), psub: BBox.empty(), psup: BBox.empty(),
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numPrescripts: 0, numScripts: 0
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};
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//
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// Get the bboxes for all the scripts and combine them into the scriptData
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//
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const lists = this.getScriptBBoxLists();
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this.combineBBoxLists(data.sub, data.sup, lists.subList, lists.supList);
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this.combineBBoxLists(data.psub, data.psup, lists.psubList, lists.psupList);
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data.base = lists.base[0];
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//
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// Save the lengths and return the data
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//
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data.numPrescripts = lists.psubList.length;
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data.numScripts = lists.subList.length;
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}
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/**
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* @return {ScriptLists} The bounding boxes for all the scripts divided into lists by position
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*/
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public getScriptBBoxLists(): ScriptLists {
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const lists: ScriptLists = {
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base: [], subList: [], supList: [], psubList: [], psupList: []
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};
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//
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// The first entry is the base, and then they altername sub- and superscripts.
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// Once we find the <mprescripts/> element, switch to presub- and presuperscript lists.
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//
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let script: ScriptListName = 'base';
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for (const child of this.childNodes) {
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if (child.node.isKind('mprescripts')) {
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script = 'psubList';
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} else {
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lists[script].push(child.getOuterBBox());
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script = NextScript[script];
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}
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}
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//
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// The index of the first prescript (skip over base, sub- and superscripts, and mprescripts)
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//
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this.firstPrescript = lists.subList.length + lists.supList.length + 2;
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//
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// Make sure the lists are the same length
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//
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this.padLists(lists.subList, lists.supList);
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this.padLists(lists.psubList, lists.psupList);
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return lists;
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}
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/**
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* Pad the second list, if it is one short
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*
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* @param {BBox[]} list1 The first list
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* @param {BBox[]} list2 The second list
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*/
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public padLists(list1: BBox[], list2: BBox[]) {
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if (list1.length > list2.length) {
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list2.push(BBox.empty());
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}
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}
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/**
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* @param {BBox} bbox1 The bbox for the combined subscripts
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* @param {BBox} bbox2 The bbox for the combined superscripts
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* @param {BBox[]} list1 The list of subscripts to combine
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* @param {BBox[]} list2 The list of superscripts to combine
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*/
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public combineBBoxLists(bbox1: BBox, bbox2: BBox, list1: BBox[], list2: BBox[]) {
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for (let i = 0; i < list1.length; i++) {
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const [w1, h1, d1] = this.getScaledWHD(list1[i]);
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const [w2, h2, d2] = this.getScaledWHD(list2[i]);
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const w = Math.max(w1, w2);
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bbox1.w += w;
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bbox2.w += w;
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if (h1 > bbox1.h) bbox1.h = h1;
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if (d1 > bbox1.d) bbox1.d = d1;
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if (h2 > bbox2.h) bbox2.h = h2;
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if (d2 > bbox2.d) bbox2.d = d2;
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}
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}
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/**
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* @param {BBox} bbox The bounding box from which to get the (scaled) width, height, and depth
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*/
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public getScaledWHD(bbox: BBox) {
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const {w, h, d, rscale} = bbox;
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return [w * rscale, h * rscale, d * rscale];
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}
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/*************************************************************/
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/**
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* @override
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*/
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public getUVQ(subbox: BBox, supbox: BBox) {
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if (!this.UVQ) {
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let [u, v, q] = [0, 0, 0];
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if (subbox.h === 0 && subbox.d === 0) {
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//
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// Use placement for superscript only
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//
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u = this.getU();
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} else if (supbox.h === 0 && supbox.d === 0) {
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//
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// Use placement for subsccript only
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//
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u = -this.getV();
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} else {
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//
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// Use placement for both
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//
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[u, v, q] = super.getUVQ(subbox, supbox);
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}
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this.UVQ = [u, v, q];
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}
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return this.UVQ;
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}
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};
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}
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