properly parse xcolor names

src/common/InputHandler.test.ts

@@ -54,6 +54,10 @@ class TestInputHandler extends InputHandler {
       prev = await result;
     }
   }
+
+  public parseXColorName(data: string): void | [number, number, number] {
+    return this._parseXColorName(data);
+  }
 }
 
 describe('InputHandler', () => {
@@ -1865,6 +1869,63 @@ describe('InputHandler', () => {
     });
   });
   describe('OSC', () => {
+    describe.only('parse xcolor names', () => {
+      it('rgb:<r>/<g>/<b> scheme in 4/8/12/16 bit', () => {
+        // 4 bit
+        assert.deepEqual(inputHandler.parseXColorName('rgb:0/0/0'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:f/f/f'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:1/2/3'), [17, 34, 51]);
+        // 8 bit
+        assert.deepEqual(inputHandler.parseXColorName('rgb:00/00/00'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:ff/ff/ff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:11/22/33'), [17, 34, 51]);
+        // 12 bit
+        assert.deepEqual(inputHandler.parseXColorName('rgb:000/000/000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:fff/fff/fff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:111/222/333'), [17, 34, 51]);
+        // 16 bit
+        assert.deepEqual(inputHandler.parseXColorName('rgb:0000/0000/0000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:ffff/ffff/ffff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('rgb:1111/2222/3333'), [17, 34, 51]);
+      });
+      it('#RGB scheme in 4/8/12/16 bit', () => {
+        // 4 bit
+        assert.deepEqual(inputHandler.parseXColorName('#000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('#fff'), [240, 240, 240]);
+        assert.deepEqual(inputHandler.parseXColorName('#123'), [16, 32, 48]);
+        // 8 bit
+        assert.deepEqual(inputHandler.parseXColorName('#000000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('#ffffff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('#112233'), [17, 34, 51]);
+        // 12 bit
+        assert.deepEqual(inputHandler.parseXColorName('#000000000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('#fffffffff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('#111222333'), [17, 34, 51]);
+        // 16 bit
+        assert.deepEqual(inputHandler.parseXColorName('#000000000000'), [0, 0, 0]);
+        assert.deepEqual(inputHandler.parseXColorName('#ffffffffffff'), [255, 255, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('#111122223333'), [17, 34, 51]);
+      });
+      it('supports upper case', () => {
+        assert.deepEqual(inputHandler.parseXColorName('RGB:0/A/F'), [0, 170, 255]);
+        assert.deepEqual(inputHandler.parseXColorName('#FFF'), [240, 240, 240]);
+      });
+      it('does not parse illegal combinations', () => {
+        // shifting bit width
+        assert.equal(inputHandler.parseXColorName('rgb:0/11/222'), undefined);
+        // unsupported scheme
+        assert.equal(inputHandler.parseXColorName('rgbi:00/11/22'), undefined);
+        // broken # specifier
+        assert.equal(inputHandler.parseXColorName('#aabbbcc'), undefined);
+        // out of range
+        assert.equal(inputHandler.parseXColorName('#aabbgg'), undefined);
+        assert.equal(inputHandler.parseXColorName('rgb:aa/bb/gg'), undefined);
+      });
+    });
+
+
+
+
     it('4: should parse correct Ansi color change data', () => {
       // this is testing a private method
       const event = inputHandler.parseAnsiColorChange('19;rgb:a1/b2/c3');