translate: support percentage values

Author: kristerkari

src/__tests__/transform.js

@@ -12,6 +12,20 @@ it('transforms a single transform value with string', () => {
   })
 })
 
+it('transforms a single transform value with percentage', () => {
+  expect(transformCss([['transform', 'translate(100%, 100%)']])).toEqual({
+    transform: [{ translateY: '100%' }, { translateX: '100%' }],
+  })
+})
+
+it('transforms multiple transform values with percentage', () => {
+  expect(
+    transformCss([['transform', 'translateY(100%) translateX(100%)']])
+  ).toEqual({
+    transform: [{ translateX: '100%' }, { translateY: '100%' }],
+  })
+})
+
 it('transforms multiple transform values', () => {
   expect(transformCss([['transform', 'scaleX(5) skewX(1deg)']])).toEqual({
     transform: [{ skewX: '1deg' }, { scaleX: 5 }],

src/transforms/transform.js

@@ -1,24 +1,24 @@
-import { SPACE, COMMA, LENGTH, NUMBER, ANGLE } from '../tokenTypes'
+import { SPACE, COMMA, LENGTH, NUMBER, ANGLE, PERCENT } from '../tokenTypes'
 
-const oneOfType = tokenType => functionStream => {
-  const value = functionStream.expect(tokenType)
+const oneOfTypes = tokenTypes => functionStream => {
+  const value = functionStream.expect(...tokenTypes)
   functionStream.expectEmpty()
   return value
 }
 
-const singleNumber = oneOfType(NUMBER)
-const singleLength = oneOfType(LENGTH)
-const singleAngle = oneOfType(ANGLE)
-const xyTransformFactory = tokenType => (
+const singleNumber = oneOfTypes([NUMBER])
+const singleLengthOrPercent = oneOfTypes([LENGTH, PERCENT])
+const singleAngle = oneOfTypes([ANGLE])
+const xyTransformFactory = tokenTypes => (
   key,
   valueIfOmitted
 ) => functionStream => {
-  const x = functionStream.expect(tokenType)
+  const x = functionStream.expect(...tokenTypes)
 
   let y
   if (functionStream.hasTokens()) {
     functionStream.expect(COMMA)
-    y = functionStream.expect(tokenType)
+    y = functionStream.expect(...tokenTypes)
   } else if (valueIfOmitted !== undefined) {
     y = valueIfOmitted
   } else {
@@ -31,18 +31,18 @@ const xyTransformFactory = tokenType => (
 
   return [{ [`${key}Y`]: y }, { [`${key}X`]: x }]
 }
-const xyNumber = xyTransformFactory(NUMBER)
-const xyLength = xyTransformFactory(LENGTH)
-const xyAngle = xyTransformFactory(ANGLE)
+const xyNumber = xyTransformFactory([NUMBER])
+const xyLengthOrPercent = xyTransformFactory([LENGTH, PERCENT])
+const xyAngle = xyTransformFactory([ANGLE])
 
 const partTransforms = {
   perspective: singleNumber,
   scale: xyNumber('scale'),
   scaleX: singleNumber,
   scaleY: singleNumber,
-  translate: xyLength('translate', 0),
-  translateX: singleLength,
-  translateY: singleLength,
+  translate: xyLengthOrPercent('translate', 0),
+  translateX: singleLengthOrPercent,
+  translateY: singleLengthOrPercent,
   rotate: singleAngle,
   rotateX: singleAngle,
   rotateY: singleAngle,