wip: parser

2kyu/evaluate-mathematical-expression/tests.ts

@@ -1,4 +1,4 @@
-import { calc } from './solution';
+import { calc, tokenize } from './solution';
 import { expect } from "chai";
 
 var tests: [string, number][] = [
@@ -13,12 +13,102 @@ var tests: [string, number][] = [
   ['2 / (2 + 3) * 4.33 - -6', 7.732],
 ];
 
-describe("calc", function() {
+describe("calc", function () {
   it("should evaluate correctly", () => {
-    tests.forEach(function(m) {
+    tests.forEach(function (m) {
       var x = calc(m[0]);
       var y = m[1];
       expect(x).to.equal(y, 'Expected: "' + m[0] + '" to be ' + y + ' but got ' + x);
     });
   });
 });
+
+describe("tokenize", function () {
+  it("should tokenize correctly", () => {
+    expect(tokenize('1 + 1')).to.deep.equal([{
+      type: 'number',
+      value: '1'
+    }, {
+      type: 'operator',
+      value: '+'
+    }, {
+      type: 'number',
+      value: '1'
+    }]);
+    expect(tokenize('1 - 1')).to.deep.equal([{
+      type: 'number',
+      value: '1'
+    }, {
+      type: 'operator',
+      value: '-'
+    }, {
+      type: 'number',
+      value: '1'
+    }]);
+    expect(tokenize('1 * 1')).to.deep.equal([{
+      type: 'number',
+      value: '1'
+    }, {
+      type: 'operator',
+      value: '*'
+    }, {
+      type: 'number',
+      value: '1'
+    }]);
+    expect(tokenize('1 / 1')).to.deep.equal([{
+      type: 'number',
+      value: '1'
+    }, {
+      type: 'operator',
+      value: '/'
+    }, {
+      type: 'number',
+      value: '1'
+    }]);
+    expect(tokenize('-3.1415')).to.deep.equal([{
+      type: 'operator',
+      value: '-'
+    }, {
+      type: 'number',
+      value: '3'
+    }, {
+      type: 'decimal',
+      value: '.'
+    }, {
+      type: 'number',
+      value: '1415'
+    }]);
+    expect(tokenize('3.1415')).to.deep.equal([{
+      type: 'number',
+      value: '3'
+    }, {
+      type: 'decimal',
+      value: '.'
+    }, {
+      type: 'number',
+      value: '1415'
+    }]);
+    expect(tokenize('(3 + 5) / 3')).to.deep.equal([{
+      type: 'parenthesis',
+      value: '('
+    }, {
+      type: 'number',
+      value: '3'
+    }, {
+      type: 'operator',
+      value: '+'
+    }, {
+      type: 'number',
+      value: '5'
+    }, {
+      type: 'parenthesis',
+      value: ')'
+    }, {
+      type: 'operator',
+      value: '/'
+    }, {
+      type: 'number',
+      value: '3'
+    }]);
+  });
+});