Improve numberProp and numberArrayProp PropTypes usage.

Implement "normal" relative unit in java.

android/src/main/java/com/horcrux/svg/PropHelper.java

@@ -95,7 +95,7 @@ class PropHelper {
         length = length.trim();
         int stringLength = length.length();
         int percentIndex = stringLength - 1;
-        if (stringLength == 0) {
+        if (stringLength == 0 || length.equals("normal")) {
             return offset;
         } else if (length.codePointAt(percentIndex) == '%') {
             return Double.valueOf(length.substring(0, percentIndex)) / 100 * relative + offset;

lib/props.js

@@ -2,6 +2,7 @@ import PropTypes from 'prop-types';
 import {PanResponder} from 'react-native';
 
 const numberProp = PropTypes.oneOfType([PropTypes.string, PropTypes.number]);
+const numberArrayProp = PropTypes.oneOfType([PropTypes.arrayOf(numberProp), numberProp]);
 
 const touchableProps = {
     disabled: PropTypes.bool,
@@ -41,7 +42,7 @@ const strokeProps = {
     stroke: PropTypes.string,
     strokeWidth: numberProp,
     strokeOpacity: numberProp,
-    strokeDasharray: PropTypes.oneOfType([PropTypes.arrayOf(numberProp), PropTypes.string]),
+    strokeDasharray: numberArrayProp,
     strokeDashoffset: numberProp,
     strokeLinecap: PropTypes.oneOf(['butt', 'square', 'round']),
     strokeLinejoin: PropTypes.oneOf(['miter', 'bevel', 'round']),
@@ -96,7 +97,7 @@ const fontStretch = PropTypes.oneOf(['normal', 'wider', 'narrower', 'ultra-conde
 
 // <absolute-size> | <relative-size> | <length> | <percentage> | inherit
 // https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/font-size
-const fontSize = PropTypes.string;
+const fontSize = numberProp;
 
 // [[<family-name> | <generic-family>],]* [<family-name> | <generic-family>] | inherit
 // https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/font-family
@@ -132,15 +133,15 @@ const textDecoration = PropTypes.oneOf(['none', 'underline', 'overline', 'line-t
 
 // normal | <length> | inherit
 // https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/letter-spacing
-const letterSpacing = PropTypes.string;
+const letterSpacing = numberProp;
 
 // normal | <length> | inherit
 // https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/word-spacing
-const wordSpacing = PropTypes.string;
+const wordSpacing = numberProp;
 
 // auto | <length> | inherit
 // https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/kerning
-const kerning = PropTypes.string;
+const kerning = numberProp;
 
 /*
 Name:	font-variant-ligatures
@@ -195,7 +196,7 @@ const lengthAdjust = PropTypes.oneOf(['spacing', 'spacingAndGlyphs']);
  https://svgwg.org/svg2-draft/text.html#TextElementTextLengthAttribute
  https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/textLength
 */
-const textLength = PropTypes.string;
+const textLength = numberProp;
 
 /*
  2.2. Transverse Box Alignment: the vertical-align property
@@ -218,7 +219,7 @@ const textLength = PropTypes.string;
  https://www.w3.org/TR/css-inline-3/#transverse-alignment
  https://drafts.csswg.org/css-inline/#propdef-vertical-align
  */
-const verticalAlign = PropTypes.string;
+const verticalAlign = numberProp;
 
 /*
  Name:	alignment-baseline
@@ -258,7 +259,7 @@ const alignmentBaseline = PropTypes.oneOf(['baseline', 'text-bottom', 'alphabeti
 
  https://www.w3.org/TR/css-inline-3/#propdef-baseline-shift
 */
-const baselineShift = PropTypes.oneOfType([PropTypes.oneOf(['sub', 'super', 'baseline']), PropTypes.arrayOf(numberProp), PropTypes.string]);
+const baselineShift = PropTypes.oneOfType([PropTypes.oneOf(['sub', 'super', 'baseline']), PropTypes.arrayOf(numberProp), numberProp]);
 
 /*
  6.12. Low-level font feature settings control: the font-feature-settings property
@@ -375,8 +376,8 @@ const textSpecificProps = {
 // https://svgwg.org/svg2-draft/text.html#TSpanAttributes
 const textProps = {
     ...textSpecificProps,
-    dx: PropTypes.string,
+    dx: numberArrayProp,
-    dy: PropTypes.string,
+    dy: numberArrayProp,
 };
 
 /*
@@ -404,7 +405,7 @@ const side = PropTypes.oneOf(['left', 'right']);
  https://svgwg.org/svg2-draft/text.html#TextPathElementStartOffsetAttribute
  https://developer.mozilla.org/en/docs/Web/SVG/Element/textPath
  */
-const startOffset = PropTypes.string;
+const startOffset = numberProp;
 
 /*
  Name