perf: introduce AST to avoid reparse

src/parser/match-operator.ts

@@ -0,0 +1,24 @@
+import { VARIABLE } from '../util/character'
+
+const trie = {
+  a: { n: { d: { end: true, needBoundary: true } } },
+  o: { r: { end: true, needBoundary: true } },
+  c: { o: { n: { t: { a: { i: { n: { s: { end: true, needBoundary: true } } } } } } } },
+  '=': { '=': { end: true } },
+  '!': { '=': { end: true } },
+  '>': { end: true, '=': { end: true } },
+  '<': { end: true, '=': { end: true } }
+}
+
+export function matchOperator (str: string, begin: number, end = str.length) {
+  let node = trie
+  let i = begin
+  let info
+  while (node[str[i]] && i < end) {
+    node = node[str[i++]]
+    if (node['end']) info = node
+  }
+  if (!info) return -1
+  if (info['needBoundary'] && str.charCodeAt(i) & VARIABLE) return -1
+  return i
+}