refactor: rewrite expression evaluation, fix #130

test/unit/parser/literal.ts

@@ -0,0 +1,27 @@
+import { expect } from 'chai'
+import { parseLiteral } from '../../../src/parser/literal'
+import { NullDrop } from '../../../src/drop/null-drop'
+
+describe('parseLiteral', function () {
+  it('should eval boolean literal', async function () {
+    expect(parseLiteral('true')).to.equal(true)
+    expect(parseLiteral('TrUE')).to.equal(undefined)
+    expect(parseLiteral('false')).to.equal(false)
+  })
+  it('should eval number literal', async function () {
+    expect(parseLiteral('2.3')).to.equal(2.3)
+    expect(parseLiteral('.32')).to.equal(0.32)
+    expect(parseLiteral('-23.')).to.equal(-23)
+    expect(parseLiteral('23')).to.equal(23)
+  })
+  it('should eval string literal', async function () {
+    expect(parseLiteral('"ab\'c"')).to.equal("ab'c")
+    expect(parseLiteral("'ab\"c'")).to.equal('ab"c')
+  })
+  it('should eval nil literal', async function () {
+    expect(parseLiteral('nil')).to.be.instanceOf(NullDrop)
+  })
+  it('should eval null literal', async function () {
+    expect(parseLiteral('null')).to.be.instanceOf(NullDrop)
+  })
+})