perf: introduce AST to avoid reparse

test/unit/parser/match-operator.ts

@@ -0,0 +1,26 @@
+import { expect } from 'chai'
+import { matchOperator } from '../../../src/parser/match-operator'
+
+describe('parser/matchOperator()', function () {
+  it('should match contains', () => {
+    expect(matchOperator('contains', 0)).to.equal(8)
+  })
+  it('should match comparision', () => {
+    expect(matchOperator('>', 0)).to.equal(1)
+    expect(matchOperator('>=', 0)).to.equal(2)
+    expect(matchOperator('<', 0)).to.equal(1)
+    expect(matchOperator('<=', 0)).to.equal(2)
+  })
+  it('should match binary logic', () => {
+    expect(matchOperator('and', 0)).to.equal(3)
+    expect(matchOperator('or', 0)).to.equal(2)
+  })
+  it('should not match if word not terminate', () => {
+    expect(matchOperator('true1', 0)).to.equal(-1)
+    expect(matchOperator('containsa', 0)).to.equal(-1)
+  })
+  it('should match if word boundary found', () => {
+    expect(matchOperator('>=1', 0)).to.equal(2)
+    expect(matchOperator('contains b', 0)).to.equal(8)
+  })
+})