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-rw-r--r--packages/dev-tools-pages/ts/highlight.tsx69
1 files changed, 69 insertions, 0 deletions
diff --git a/packages/dev-tools-pages/ts/highlight.tsx b/packages/dev-tools-pages/ts/highlight.tsx
new file mode 100644
index 000000000..cef03904a
--- /dev/null
+++ b/packages/dev-tools-pages/ts/highlight.tsx
@@ -0,0 +1,69 @@
+import * as hljs from 'highlight.js/lib/highlight';
+import * as javascript from 'highlight.js/lib/languages/javascript';
+import * as json from 'highlight.js/lib/languages/json';
+
+hljs.registerLanguage('javascript', javascript);
+hljs.registerLanguage('json', json);
+
+interface PatchInterface {
+ [key: string]: string;
+}
+
+const PATCH_TYPES: PatchInterface = {
+ '+': 'addition',
+ '-': 'deletion',
+ '!': 'change',
+};
+
+function diffHighlight(language: string, code: any, gutter: any): string {
+ return code
+ .split(/\r?\n/g)
+ .map((line: string, index: number) => {
+ let type;
+ let currentLine = line;
+
+ if (/^-{3} [^-]+ -{4}$|^\*{3} [^*]+ \*{4}$|^@@ [^@]+ @@$/.test(currentLine)) {
+ type = 'chunk';
+ } else if (/^Index: |^[+\-*]{3}|^[*=]{5,}$/.test(currentLine)) {
+ type = 'header';
+ } else {
+ type = PATCH_TYPES[currentLine[0]] || 'null';
+ currentLine = currentLine.replace(/^[+\-! ]/, '');
+ }
+
+ const g = gutter[index];
+
+ return `<span data-gutter="${g !== undefined ? `${g}x` : ''}" class="line-${type}">${
+ hljs.highlight(language, currentLine).value
+ }</span>`;
+ })
+ .join('\n');
+}
+
+interface HighlightProps {
+ language: string;
+ code: string;
+ isDiff?: boolean;
+ gutter?: [];
+ isEtc?: boolean;
+}
+
+function highlight({ language, code, isDiff, gutter, isEtc }: HighlightProps): string {
+ if (isDiff) {
+ return diffHighlight(language, code, gutter);
+ }
+
+ const hlCode = hljs.highlight(language, code).value;
+
+ if (!isEtc) {
+ return hlCode;
+ }
+
+ const hc = hlCode.split(/\r?\n/g);
+ hc.splice(1, 0, ' ...');
+ hc.splice(hc.length - 1, 0, ' ...');
+
+ return hc.join('\n');
+}
+
+export { highlight };