795 lines
20 KiB
JavaScript
795 lines
20 KiB
JavaScript
import katex from '../katex.mjs';
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/**
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* renderA11yString returns a readable string.
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*
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* In some cases the string will have the proper semantic math
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* meaning,:
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* renderA11yString("\\frac{1}{2}"")
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* -> "start fraction, 1, divided by, 2, end fraction"
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*
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* However, other cases do not:
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* renderA11yString("f(x) = x^2")
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* -> "f, left parenthesis, x, right parenthesis, equals, x, squared"
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*
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* The commas in the string aim to increase ease of understanding
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* when read by a screenreader.
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*/
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var stringMap = {
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"(": "left parenthesis",
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")": "right parenthesis",
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"[": "open bracket",
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"]": "close bracket",
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"\\{": "left brace",
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"\\}": "right brace",
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"\\lvert": "open vertical bar",
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"\\rvert": "close vertical bar",
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"|": "vertical bar",
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"\\uparrow": "up arrow",
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"\\Uparrow": "up arrow",
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"\\downarrow": "down arrow",
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"\\Downarrow": "down arrow",
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"\\updownarrow": "up down arrow",
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"\\leftarrow": "left arrow",
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"\\Leftarrow": "left arrow",
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"\\rightarrow": "right arrow",
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"\\Rightarrow": "right arrow",
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"\\langle": "open angle",
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"\\rangle": "close angle",
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"\\lfloor": "open floor",
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"\\rfloor": "close floor",
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"\\int": "integral",
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"\\intop": "integral",
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"\\lim": "limit",
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"\\ln": "natural log",
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"\\log": "log",
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"\\sin": "sine",
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"\\cos": "cosine",
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"\\tan": "tangent",
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"\\cot": "cotangent",
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"\\sum": "sum",
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"/": "slash",
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",": "comma",
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".": "point",
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"-": "negative",
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"+": "plus",
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"~": "tilde",
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":": "colon",
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"?": "question mark",
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"'": "apostrophe",
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"\\%": "percent",
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" ": "space",
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"\\ ": "space",
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"\\$": "dollar sign",
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"\\angle": "angle",
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"\\degree": "degree",
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"\\circ": "circle",
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"\\vec": "vector",
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"\\triangle": "triangle",
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"\\pi": "pi",
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"\\prime": "prime",
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"\\infty": "infinity",
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"\\alpha": "alpha",
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"\\beta": "beta",
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"\\gamma": "gamma",
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"\\omega": "omega",
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"\\theta": "theta",
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"\\sigma": "sigma",
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"\\lambda": "lambda",
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"\\tau": "tau",
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"\\Delta": "delta",
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"\\delta": "delta",
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"\\mu": "mu",
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"\\rho": "rho",
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"\\nabla": "del",
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"\\ell": "ell",
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"\\ldots": "dots",
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// TODO: add entries for all accents
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"\\hat": "hat",
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"\\acute": "acute"
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};
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var powerMap = {
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"prime": "prime",
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"degree": "degrees",
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"circle": "degrees",
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"2": "squared",
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"3": "cubed"
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};
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var openMap = {
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"|": "open vertical bar",
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".": ""
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};
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var closeMap = {
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"|": "close vertical bar",
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".": ""
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};
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var binMap = {
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"+": "plus",
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"-": "minus",
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"\\pm": "plus minus",
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"\\cdot": "dot",
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"*": "times",
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"/": "divided by",
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"\\times": "times",
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"\\div": "divided by",
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"\\circ": "circle",
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"\\bullet": "bullet"
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};
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var relMap = {
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"=": "equals",
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"\\approx": "approximately equals",
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"≠": "does not equal",
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"\\geq": "is greater than or equal to",
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"\\ge": "is greater than or equal to",
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"\\leq": "is less than or equal to",
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"\\le": "is less than or equal to",
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">": "is greater than",
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"<": "is less than",
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"\\leftarrow": "left arrow",
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"\\Leftarrow": "left arrow",
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"\\rightarrow": "right arrow",
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"\\Rightarrow": "right arrow",
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":": "colon"
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};
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var accentUnderMap = {
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"\\underleftarrow": "left arrow",
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"\\underrightarrow": "right arrow",
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"\\underleftrightarrow": "left-right arrow",
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"\\undergroup": "group",
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"\\underlinesegment": "line segment",
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"\\utilde": "tilde"
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};
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var buildString = (str, type, a11yStrings) => {
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if (!str) {
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return;
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}
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var ret;
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if (type === "open") {
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ret = str in openMap ? openMap[str] : stringMap[str] || str;
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} else if (type === "close") {
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ret = str in closeMap ? closeMap[str] : stringMap[str] || str;
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} else if (type === "bin") {
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ret = binMap[str] || str;
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} else if (type === "rel") {
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ret = relMap[str] || str;
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} else {
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ret = stringMap[str] || str;
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} // If the text to add is a number and there is already a string
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// in the list and the last string is a number then we should
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// combine them into a single number
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if (/^\d+$/.test(ret) && a11yStrings.length > 0 && // TODO(kevinb): check that the last item in a11yStrings is a string
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// I think we might be able to drop the nested arrays, which would make
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// this easier to type
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// $FlowFixMe
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/^\d+$/.test(a11yStrings[a11yStrings.length - 1])) {
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a11yStrings[a11yStrings.length - 1] += ret;
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} else if (ret) {
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a11yStrings.push(ret);
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}
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};
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var buildRegion = (a11yStrings, callback) => {
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var regionStrings = [];
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a11yStrings.push(regionStrings);
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callback(regionStrings);
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};
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var handleObject = (tree, a11yStrings, atomType) => {
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// Everything else is assumed to be an object...
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switch (tree.type) {
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case "accent":
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{
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buildRegion(a11yStrings, a11yStrings => {
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buildA11yStrings(tree.base, a11yStrings, atomType);
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a11yStrings.push("with");
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buildString(tree.label, "normal", a11yStrings);
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a11yStrings.push("on top");
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});
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break;
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}
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case "accentUnder":
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{
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buildRegion(a11yStrings, a11yStrings => {
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buildA11yStrings(tree.base, a11yStrings, atomType);
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a11yStrings.push("with");
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buildString(accentUnderMap[tree.label], "normal", a11yStrings);
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a11yStrings.push("underneath");
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});
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break;
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}
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case "accent-token":
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{
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// Used internally by accent symbols.
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break;
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}
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case "atom":
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{
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var {
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text
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} = tree;
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switch (tree.family) {
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case "bin":
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{
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buildString(text, "bin", a11yStrings);
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break;
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}
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case "close":
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{
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buildString(text, "close", a11yStrings);
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break;
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}
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// TODO(kevinb): figure out what should be done for inner
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case "inner":
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{
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buildString(tree.text, "inner", a11yStrings);
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break;
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}
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case "open":
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{
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buildString(text, "open", a11yStrings);
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break;
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}
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case "punct":
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{
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buildString(text, "punct", a11yStrings);
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break;
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}
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case "rel":
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{
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buildString(text, "rel", a11yStrings);
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break;
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}
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default:
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{
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tree.family;
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throw new Error("\"" + tree.family + "\" is not a valid atom type");
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}
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}
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break;
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}
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case "color":
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{
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var color = tree.color.replace(/katex-/, "");
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buildRegion(a11yStrings, regionStrings => {
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regionStrings.push("start color " + color);
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end color " + color);
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});
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break;
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}
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case "color-token":
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{
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// Used by \color, \colorbox, and \fcolorbox but not directly rendered.
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// It's a leaf node and has no children so just break.
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break;
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}
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case "delimsizing":
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{
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if (tree.delim && tree.delim !== ".") {
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buildString(tree.delim, "normal", a11yStrings);
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}
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break;
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}
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case "genfrac":
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{
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buildRegion(a11yStrings, regionStrings => {
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// genfrac can have unbalanced delimiters
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var {
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leftDelim,
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rightDelim
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} = tree; // NOTE: Not sure if this is a safe assumption
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// hasBarLine true -> fraction, false -> binomial
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if (tree.hasBarLine) {
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regionStrings.push("start fraction");
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leftDelim && buildString(leftDelim, "open", regionStrings);
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buildA11yStrings(tree.numer, regionStrings, atomType);
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regionStrings.push("divided by");
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buildA11yStrings(tree.denom, regionStrings, atomType);
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rightDelim && buildString(rightDelim, "close", regionStrings);
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regionStrings.push("end fraction");
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} else {
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regionStrings.push("start binomial");
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leftDelim && buildString(leftDelim, "open", regionStrings);
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buildA11yStrings(tree.numer, regionStrings, atomType);
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regionStrings.push("over");
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buildA11yStrings(tree.denom, regionStrings, atomType);
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rightDelim && buildString(rightDelim, "close", regionStrings);
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regionStrings.push("end binomial");
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}
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});
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break;
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}
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case "hbox":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "kern":
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{
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// No op: we don't attempt to present kerning information
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// to the screen reader.
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break;
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}
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case "leftright":
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{
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buildRegion(a11yStrings, regionStrings => {
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buildString(tree.left, "open", regionStrings);
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buildA11yStrings(tree.body, regionStrings, atomType);
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buildString(tree.right, "close", regionStrings);
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});
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break;
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}
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case "leftright-right":
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{
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// TODO: double check that this is a no-op
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break;
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}
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case "lap":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "mathord":
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{
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buildString(tree.text, "normal", a11yStrings);
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break;
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}
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case "op":
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{
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var {
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body,
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name
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} = tree;
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if (body) {
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buildA11yStrings(body, a11yStrings, atomType);
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} else if (name) {
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buildString(name, "normal", a11yStrings);
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}
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break;
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}
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case "op-token":
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{
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// Used internally by operator symbols.
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buildString(tree.text, atomType, a11yStrings);
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break;
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}
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case "ordgroup":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "overline":
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{
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buildRegion(a11yStrings, function (a11yStrings) {
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a11yStrings.push("start overline");
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buildA11yStrings(tree.body, a11yStrings, atomType);
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a11yStrings.push("end overline");
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});
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break;
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}
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case "phantom":
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{
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a11yStrings.push("empty space");
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break;
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}
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case "raisebox":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "rule":
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{
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a11yStrings.push("rectangle");
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break;
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}
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case "sizing":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "spacing":
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{
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a11yStrings.push("space");
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break;
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}
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case "styling":
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{
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// We ignore the styling and just pass through the contents
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "sqrt":
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{
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buildRegion(a11yStrings, regionStrings => {
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var {
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body,
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index
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} = tree;
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if (index) {
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var indexString = flatten(buildA11yStrings(index, [], atomType)).join(",");
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if (indexString === "3") {
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regionStrings.push("cube root of");
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buildA11yStrings(body, regionStrings, atomType);
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regionStrings.push("end cube root");
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return;
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}
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regionStrings.push("root");
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regionStrings.push("start index");
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buildA11yStrings(index, regionStrings, atomType);
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regionStrings.push("end index");
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return;
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}
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regionStrings.push("square root of");
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buildA11yStrings(body, regionStrings, atomType);
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regionStrings.push("end square root");
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});
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break;
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}
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case "supsub":
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{
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var {
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base,
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sub,
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sup
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} = tree;
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var isLog = false;
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if (base) {
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buildA11yStrings(base, a11yStrings, atomType);
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isLog = base.type === "op" && base.name === "\\log";
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}
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if (sub) {
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var regionName = isLog ? "base" : "subscript";
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start " + regionName);
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buildA11yStrings(sub, regionStrings, atomType);
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regionStrings.push("end " + regionName);
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});
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}
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if (sup) {
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buildRegion(a11yStrings, function (regionStrings) {
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var supString = flatten(buildA11yStrings(sup, [], atomType)).join(",");
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if (supString in powerMap) {
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regionStrings.push(powerMap[supString]);
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return;
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}
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regionStrings.push("start superscript");
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buildA11yStrings(sup, regionStrings, atomType);
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regionStrings.push("end superscript");
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});
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}
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break;
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}
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case "text":
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{
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// TODO: handle other fonts
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if (tree.font === "\\textbf") {
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start bold text");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end bold text");
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});
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break;
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}
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start text");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end text");
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});
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break;
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}
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case "textord":
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{
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buildString(tree.text, atomType, a11yStrings);
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break;
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}
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case "smash":
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{
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buildA11yStrings(tree.body, a11yStrings, atomType);
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break;
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}
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case "enclose":
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{
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// TODO: create a map for these.
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// TODO: differentiate between a body with a single atom, e.g.
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// "cancel a" instead of "start cancel, a, end cancel"
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if (/cancel/.test(tree.label)) {
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start cancel");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end cancel");
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});
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break;
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} else if (/box/.test(tree.label)) {
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start box");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end box");
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});
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break;
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} else if (/sout/.test(tree.label)) {
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start strikeout");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end strikeout");
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});
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break;
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} else if (/phase/.test(tree.label)) {
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buildRegion(a11yStrings, function (regionStrings) {
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regionStrings.push("start phase angle");
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buildA11yStrings(tree.body, regionStrings, atomType);
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regionStrings.push("end phase angle");
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});
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break;
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}
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throw new Error("KaTeX-a11y: enclose node with " + tree.label + " not supported yet");
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}
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case "vcenter":
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{
|
|
buildA11yStrings(tree.body, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
case "vphantom":
|
|
{
|
|
throw new Error("KaTeX-a11y: vphantom not implemented yet");
|
|
}
|
|
|
|
case "hphantom":
|
|
{
|
|
throw new Error("KaTeX-a11y: hphantom not implemented yet");
|
|
}
|
|
|
|
case "operatorname":
|
|
{
|
|
buildA11yStrings(tree.body, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
case "array":
|
|
{
|
|
throw new Error("KaTeX-a11y: array not implemented yet");
|
|
}
|
|
|
|
case "raw":
|
|
{
|
|
throw new Error("KaTeX-a11y: raw not implemented yet");
|
|
}
|
|
|
|
case "size":
|
|
{
|
|
// Although there are nodes of type "size" in the parse tree, they have
|
|
// no semantic meaning and should be ignored.
|
|
break;
|
|
}
|
|
|
|
case "url":
|
|
{
|
|
throw new Error("KaTeX-a11y: url not implemented yet");
|
|
}
|
|
|
|
case "tag":
|
|
{
|
|
throw new Error("KaTeX-a11y: tag not implemented yet");
|
|
}
|
|
|
|
case "verb":
|
|
{
|
|
buildString("start verbatim", "normal", a11yStrings);
|
|
buildString(tree.body, "normal", a11yStrings);
|
|
buildString("end verbatim", "normal", a11yStrings);
|
|
break;
|
|
}
|
|
|
|
case "environment":
|
|
{
|
|
throw new Error("KaTeX-a11y: environment not implemented yet");
|
|
}
|
|
|
|
case "horizBrace":
|
|
{
|
|
buildString("start " + tree.label.slice(1), "normal", a11yStrings);
|
|
buildA11yStrings(tree.base, a11yStrings, atomType);
|
|
buildString("end " + tree.label.slice(1), "normal", a11yStrings);
|
|
break;
|
|
}
|
|
|
|
case "infix":
|
|
{
|
|
// All infix nodes are replace with other nodes.
|
|
break;
|
|
}
|
|
|
|
case "includegraphics":
|
|
{
|
|
throw new Error("KaTeX-a11y: includegraphics not implemented yet");
|
|
}
|
|
|
|
case "font":
|
|
{
|
|
// TODO: callout the start/end of specific fonts
|
|
// TODO: map \BBb{N} to "the naturals" or something like that
|
|
buildA11yStrings(tree.body, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
case "href":
|
|
{
|
|
throw new Error("KaTeX-a11y: href not implemented yet");
|
|
}
|
|
|
|
case "cr":
|
|
{
|
|
// This is used by environments.
|
|
throw new Error("KaTeX-a11y: cr not implemented yet");
|
|
}
|
|
|
|
case "underline":
|
|
{
|
|
buildRegion(a11yStrings, function (a11yStrings) {
|
|
a11yStrings.push("start underline");
|
|
buildA11yStrings(tree.body, a11yStrings, atomType);
|
|
a11yStrings.push("end underline");
|
|
});
|
|
break;
|
|
}
|
|
|
|
case "xArrow":
|
|
{
|
|
throw new Error("KaTeX-a11y: xArrow not implemented yet");
|
|
}
|
|
|
|
case "cdlabel":
|
|
{
|
|
throw new Error("KaTeX-a11y: cdlabel not implemented yet");
|
|
}
|
|
|
|
case "cdlabelparent":
|
|
{
|
|
throw new Error("KaTeX-a11y: cdlabelparent not implemented yet");
|
|
}
|
|
|
|
case "mclass":
|
|
{
|
|
// \neq and \ne are macros so we let "htmlmathml" render the mathmal
|
|
// side of things and extract the text from that.
|
|
var _atomType = tree.mclass.slice(1); // $FlowFixMe: drop the leading "m" from the values in mclass
|
|
|
|
|
|
buildA11yStrings(tree.body, a11yStrings, _atomType);
|
|
break;
|
|
}
|
|
|
|
case "mathchoice":
|
|
{
|
|
// TODO: track which which style we're using, e.g. dispaly, text, etc.
|
|
// default to text style if even that may not be the correct style
|
|
buildA11yStrings(tree.text, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
case "htmlmathml":
|
|
{
|
|
buildA11yStrings(tree.mathml, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
case "middle":
|
|
{
|
|
buildString(tree.delim, atomType, a11yStrings);
|
|
break;
|
|
}
|
|
|
|
case "internal":
|
|
{
|
|
// internal nodes are never included in the parse tree
|
|
break;
|
|
}
|
|
|
|
case "html":
|
|
{
|
|
buildA11yStrings(tree.body, a11yStrings, atomType);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
tree.type;
|
|
throw new Error("KaTeX a11y un-recognized type: " + tree.type);
|
|
}
|
|
};
|
|
|
|
var buildA11yStrings = function buildA11yStrings(tree, a11yStrings, atomType) {
|
|
if (a11yStrings === void 0) {
|
|
a11yStrings = [];
|
|
}
|
|
|
|
if (tree instanceof Array) {
|
|
for (var i = 0; i < tree.length; i++) {
|
|
buildA11yStrings(tree[i], a11yStrings, atomType);
|
|
}
|
|
} else {
|
|
handleObject(tree, a11yStrings, atomType);
|
|
}
|
|
|
|
return a11yStrings;
|
|
};
|
|
|
|
var flatten = function flatten(array) {
|
|
var result = [];
|
|
array.forEach(function (item) {
|
|
if (item instanceof Array) {
|
|
result = result.concat(flatten(item));
|
|
} else {
|
|
result.push(item);
|
|
}
|
|
});
|
|
return result;
|
|
};
|
|
|
|
var renderA11yString = function renderA11yString(text, settings) {
|
|
var tree = katex.__parse(text, settings);
|
|
|
|
var a11yStrings = buildA11yStrings(tree, [], "normal");
|
|
return flatten(a11yStrings).join(", ");
|
|
};
|
|
|
|
export { renderA11yString as default };
|