refactor: rewrite expression evaluation, fix #130

test/unit/render/value.ts

@@ -0,0 +1,24 @@
+import { Value } from '../../../src/render/value'
+import { Context } from '../../../src/context/context'
+import { expect } from 'chai'
+
+describe('Value', function () {
+  it('should eval number variable', async function () {
+    const ctx = new Context({ one: 1 })
+    expect(new Value('one').value(ctx)).to.equal(1)
+  })
+  it('question mark should be valid variable name', async function () {
+    const ctx = new Context({ 'has_value?': true })
+    expect(new Value('has_value?').value(ctx)).to.equal(true)
+  })
+  it('should eval string variable', async function () {
+    const ctx = new Context({ x: 'XXX' })
+    expect(new Value('x').value(ctx)).to.equal('XXX')
+  })
+  it('should eval null literal', async function () {
+    expect(new Value('null').value({})).to.be.null
+  })
+  it('should eval nil literal', async function () {
+    expect(new Value('nil').value({})).to.be.null
+  })
+})