perf: optimized text scans

lib/parser_inline.js

@@ -47,11 +47,6 @@ function validateLink(url) {
 // Inline Parser class
 //
 function ParserInline() {
-
-  // Rule to skip pure text
-  // - '{}$%@+=:' reserved for extentions
-  this.textMatch = /[\n\\`*_^\[\]!&<{}$%@~+=:]/;
-
   // By default CommonMark allows too much in links
   // If you need to restrict it - override this with your validator.
   this.validateLink = validateLink;

lib/rules_inline/text.js

@@ -3,16 +3,51 @@
 
 'use strict';
 
+
+// Rule to skip pure text
+// '{}$%@~+=:' reserved for extentions
+
+function isTerminatorChar(ch) {
+  switch (ch) {
+    case 0x0A/* \n */:
+    case 0x5C/* \ */:
+    case 0x60/* ` */:
+    case 0x2A/* * */:
+    case 0x5F/* _ */:
+    case 0x5E/* ^ */:
+    case 0x5B/* [ */:
+    case 0x5D/* ] */:
+    case 0x21/* ! */:
+    case 0x26/* & */:
+    case 0x3C/* < */:
+    case 0x3E/* > */:
+    case 0x7B/* { */:
+    case 0x7D/* } */:
+    case 0x24/* $ */:
+    case 0x25/* % */:
+    case 0x40/* @ */:
+    case 0x7E/* ~ */:
+    case 0x2B/* + */:
+    case 0x3D/* = */:
+    case 0x3A/* : */:
+      return true;
+    default:
+      return false;
+  }
+}
+
 module.exports = function text(state, silent) {
-  var str = state.src.slice(state.pos),
-      next = str.search(state.parser.textMatch);
+  var pos = state.pos;
+
+  while (pos < state.posMax && !isTerminatorChar(state.src.charCodeAt(pos))) {
+    pos++;
+  }
 
-  if (next === 0) { return false; }
+  if (pos === state.pos) { return false; }
 
-  if (next < 0) { next = str.length; }
+  if (!silent) { state.pending += state.src.slice(state.pos, pos); }
 
-  if (!silent) { state.pending += str.slice(0, next); }
-  state.pos += next;
+  state.pos = pos;
 
   return true;
 };