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auto-render.js
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auto-render.js
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import wypst from 'wypst';
const findMathTextRange = function (string) {
let base = 0;
let mathTextRange = [];
while (base < string.length) {
let idx = string.indexOf("$", base);
if (idx === -1) {
break;
} else if (idx > 0 && string[idx - 1] === "\\") {
base = idx + 1;
continue;
} else {
mathTextRange.push(idx);
if (mathTextRange.length === 2) {
mathTextRange[1] += 1;
return mathTextRange;
}
base = idx + 1;
}
}
return [-1, 0]
}
const extractMathText = function (string) {
let data = [];
while (string.length > 0) {
let [begin, end] = findMathTextRange(string);
if (begin === -1 || end - begin < 1) {
data.push({
type: "text",
data: string,
});
break;
} else {
if (begin > 0) {
data.push({
type: "text",
data: string.slice(0, begin),
});
}
let rawData = string.slice(begin, end);
let display = rawData.slice(1, 2) === " " && rawData.slice(-2, -1) === " ";
data.push({
type: "math",
data: rawData.slice(1, -1).trim(),
rawData,
display
});
}
string = string.slice(end);
}
return data;
}
const renderMathInText = function (text, options) {
const data = extractMathText(text);
if (data.length === 1 && data[0].type === 'text') {
// There is no formula in the text.
// Let's return null which means there is no need to replace
// the current text node with a new one.
return null;
}
const fragment = document.createDocumentFragment();
for (let i = 0; i < data.length; i++) {
if (data[i].type === "text") {
fragment.appendChild(document.createTextNode(data[i].data));
} else {
const span = document.createElement("span");
// Override any display mode defined in the settings with that
// defined by the text itself
options.displayMode = data[i].display;
let math = data[i].data;
wypst.render(math, span, options);
fragment.appendChild(span);
}
}
return fragment;
};
const renderElem = function (elem, options) {
for (let i = 0; i < elem.childNodes.length; i++) {
const childNode = elem.childNodes[i];
if (childNode.nodeType === 3) {
// Text node
// Concatenate all sibling text nodes.
// Webkit browsers split very large text nodes into smaller ones,
// so the delimiters may be split across different nodes.
let textContentConcat = childNode.textContent;
let sibling = childNode.nextSibling;
let nSiblings = 0;
while (sibling && (sibling.nodeType === Node.TEXT_NODE)) {
textContentConcat += sibling.textContent;
sibling = sibling.nextSibling;
nSiblings++;
}
const frag = renderMathInText(textContentConcat, options);
if (frag) {
// Remove extra text nodes
for (let j = 0; j < nSiblings; j++) {
childNode.nextSibling.remove();
}
i += frag.childNodes.length - 1;
elem.replaceChild(frag, childNode);
} else {
// If the concatenated text does not contain math
// the siblings will not either
i += nSiblings;
}
} else if (childNode.nodeType === 1) {
// Element node
const className = ' ' + childNode.className + ' ';
const shouldRender = options.ignoredTags.indexOf(
childNode.nodeName.toLowerCase()) === -1 &&
options.ignoredClasses.every(
x => className.indexOf(' ' + x + ' ') === -1);
if (shouldRender) {
renderElem(childNode, options);
}
}
// Otherwise, it's something else, and ignore it.
}
};
const renderMathInElement = function (elem, options) {
if (!elem) {
throw new Error("No element provided to render");
}
const optionsUsed = {};
// Object.assign(optionsUsed, option)
for (const option in options) {
if (options.hasOwnProperty(option)) {
optionsUsed[option] = options[option];
}
}
optionsUsed.ignoredTags = optionsUsed.ignoredTags || [
"script", "noscript", "style", "textarea", "pre", "code", "option",
];
optionsUsed.ignoredClasses = optionsUsed.ignoredClasses || [];
optionsUsed.errorCallback = optionsUsed.errorCallback || console.error;
renderElem(elem, optionsUsed);
};
window.renderMathInElement = function (elem, options) {
wypst.init().then(() => {
renderMathInElement(elem, options);
});
}