103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
/* eslint no-constant-condition:0 */
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const findEndOfMath = function(delimiter, text, startIndex) {
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// Adapted from
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// https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx
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let index = startIndex;
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let braceLevel = 0;
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const delimLength = delimiter.length;
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while (index < text.length) {
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const character = text[index];
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if (braceLevel <= 0 &&
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text.slice(index, index + delimLength) === delimiter) {
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return index;
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} else if (character === "\\") {
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index++;
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} else if (character === "{") {
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braceLevel++;
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} else if (character === "}") {
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braceLevel--;
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}
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index++;
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}
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return -1;
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};
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const splitAtDelimiters = function(startData, leftDelim, rightDelim, display) {
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const finalData = [];
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for (let i = 0; i < startData.length; i++) {
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if (startData[i].type === "text") {
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const text = startData[i].data;
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let lookingForLeft = true;
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let currIndex = 0;
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let nextIndex;
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nextIndex = text.indexOf(leftDelim);
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if (nextIndex !== -1) {
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currIndex = nextIndex;
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finalData.push({
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type: "text",
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data: text.slice(0, currIndex),
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});
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lookingForLeft = false;
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}
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while (true) {
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if (lookingForLeft) {
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nextIndex = text.indexOf(leftDelim, currIndex);
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if (nextIndex === -1) {
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break;
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}
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finalData.push({
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type: "text",
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data: text.slice(currIndex, nextIndex),
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});
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currIndex = nextIndex;
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} else {
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nextIndex = findEndOfMath(
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rightDelim,
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text,
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currIndex + leftDelim.length);
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if (nextIndex === -1) {
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break;
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}
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finalData.push({
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type: "math",
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data: text.slice(
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currIndex + leftDelim.length,
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nextIndex),
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rawData: text.slice(
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currIndex,
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nextIndex + rightDelim.length),
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display: display,
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});
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currIndex = nextIndex + rightDelim.length;
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}
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lookingForLeft = !lookingForLeft;
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}
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finalData.push({
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type: "text",
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data: text.slice(currIndex),
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});
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} else {
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finalData.push(startData[i]);
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}
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}
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return finalData;
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};
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module.exports = splitAtDelimiters;
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