Commit node_modules

paige/node_modules/katex/contrib/copy-tex/katex2tex.js

@@ -0,0 +1,61 @@
+// @flow
+
+export interface CopyDelimiters {
+    inline: [string, string],
+    display: [string, string],
+}
+
+// Set these to how you want inline and display math to be delimited.
+export const defaultCopyDelimiters: CopyDelimiters = {
+    inline: ['$', '$'],    // alternative: ['\(', '\)']
+    display: ['$$', '$$'], // alternative: ['\[', '\]']
+};
+
+// Replace .katex elements with their TeX source (<annotation> element).
+// Modifies fragment in-place.  Useful for writing your own 'copy' handler,
+// as in copy-tex.js.
+export function katexReplaceWithTex(
+    fragment: DocumentFragment,
+    copyDelimiters: CopyDelimiters = defaultCopyDelimiters
+): DocumentFragment {
+    // Remove .katex-html blocks that are preceded by .katex-mathml blocks
+    // (which will get replaced below).
+    const katexHtml = fragment.querySelectorAll('.katex-mathml + .katex-html');
+    for (let i = 0; i < katexHtml.length; i++) {
+        const element = katexHtml[i];
+        if (element.remove) {
+            element.remove();
+        } else if (element.parentNode) {
+            element.parentNode.removeChild(element);
+        }
+    }
+    // Replace .katex-mathml elements with their annotation (TeX source)
+    // descendant, with inline delimiters.
+    const katexMathml = fragment.querySelectorAll('.katex-mathml');
+    for (let i = 0; i < katexMathml.length; i++) {
+        const element = katexMathml[i];
+        const texSource = element.querySelector('annotation');
+        if (texSource) {
+            if (element.replaceWith) {
+                element.replaceWith(texSource);
+            } else if (element.parentNode) {
+                element.parentNode.replaceChild(texSource, element);
+            }
+            texSource.innerHTML = copyDelimiters.inline[0] +
+                texSource.innerHTML + copyDelimiters.inline[1];
+        }
+    }
+    // Switch display math to display delimiters.
+    const displays = fragment.querySelectorAll('.katex-display annotation');
+    for (let i = 0; i < displays.length; i++) {
+        const element = displays[i];
+        element.innerHTML = copyDelimiters.display[0] +
+            element.innerHTML.substr(copyDelimiters.inline[0].length,
+                element.innerHTML.length - copyDelimiters.inline[0].length
+                - copyDelimiters.inline[1].length)
+            + copyDelimiters.display[1];
+    }
+    return fragment;
+}
+
+export default katexReplaceWithTex;