Commit node_modules

paige/node_modules/katex/contrib/auto-render/splitAtDelimiters.js

@@ -0,0 +1,85 @@
+/* eslint no-constant-condition:0 */
+const findEndOfMath = function(delimiter, text, startIndex) {
+    // Adapted from
+    // https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx
+    let index = startIndex;
+    let braceLevel = 0;
+
+    const delimLength = delimiter.length;
+
+    while (index < text.length) {
+        const character = text[index];
+
+        if (braceLevel <= 0 &&
+            text.slice(index, index + delimLength) === delimiter) {
+            return index;
+        } else if (character === "\\") {
+            index++;
+        } else if (character === "{") {
+            braceLevel++;
+        } else if (character === "}") {
+            braceLevel--;
+        }
+
+        index++;
+    }
+
+    return -1;
+};
+
+const escapeRegex = function(string) {
+    return string.replace(/[-/\\^$*+?.()|[\]{}]/g, "\\$&");
+};
+
+const amsRegex = /^\\begin{/;
+
+const splitAtDelimiters = function(text, delimiters) {
+    let index;
+    const data = [];
+
+    const regexLeft = new RegExp(
+        "(" + delimiters.map((x) => escapeRegex(x.left)).join("|") + ")"
+    );
+
+    while (true) {
+        index = text.search(regexLeft);
+        if (index === -1) {
+            break;
+        }
+        if (index > 0) {
+            data.push({
+                type: "text",
+                data: text.slice(0, index),
+            });
+            text = text.slice(index); // now text starts with delimiter
+        }
+        // ... so this always succeeds:
+        const i = delimiters.findIndex((delim) => text.startsWith(delim.left));
+        index = findEndOfMath(delimiters[i].right, text, delimiters[i].left.length);
+        if (index === -1) {
+            break;
+        }
+        const rawData = text.slice(0, index + delimiters[i].right.length);
+        const math = amsRegex.test(rawData)
+            ? rawData
+            : text.slice(delimiters[i].left.length, index);
+        data.push({
+            type: "math",
+            data: math,
+            rawData,
+            display: delimiters[i].display,
+        });
+        text = text.slice(index + delimiters[i].right.length);
+    }
+
+    if (text !== "") {
+        data.push({
+            type: "text",
+            data: text,
+        });
+    }
+
+    return data;
+};
+
+export default splitAtDelimiters;