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* Copyright (c) Nicolas Gallagher.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @noflow
*/
import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
import { MONOSPACE_FONT_STACK, SYSTEM_FONT_STACK, STYLE_SHORT_FORM_EXPANSIONS } from './constants';
import normalizeValueWithProperty from './normalizeValueWithProperty';
/**
* The browser implements the CSS cascade, where the order of properties is a
* factor in determining which styles to paint. React Native is different. It
* gives giving precedence to the more specific style property. For example,
* the value of `paddingTop` takes precedence over that of `padding`.
*
* This module creates mutally exclusive style declarations by expanding all of
* React Native's supported shortform properties (e.g. `padding`) to their
* longfrom equivalents.
*/
const emptyObject = {};
const supportsCSS3TextDecoration =
!canUseDOM ||
(window.CSS != null &&
window.CSS.supports != null &&
(window.CSS.supports('text-decoration-line', 'none') ||
window.CSS.supports('-webkit-text-decoration-line', 'none')));
/**
* Transform
*/
// { scale: 2 } => 'scale(2)'
// { translateX: 20 } => 'translateX(20px)'
// { matrix: [1,2,3,4,5,6] } => 'matrix(1,2,3,4,5,6)'
const mapTransform = (transform) => {
const type = Object.keys(transform)[0];
const value = transform[type];
if (type === 'matrix' || type === 'matrix3d') {
return `${type}(${value.join(',')})`;
} else {
const normalizedValue = normalizeValueWithProperty(value, type);
return `${type}(${normalizedValue})`;
}
};
const resolveTransform = (resolvedStyle, style) => {
let transform = style.transform;
if (Array.isArray(style.transform)) {
transform = style.transform.map(mapTransform).join(' ');
}
resolvedStyle.transform = transform;
};
/**
* Reducer
*/
const createReactDOMStyle = (style) => {
Iif (!style) {
return emptyObject;
}
const resolvedStyle = {};
Object.keys(style)
.sort()
.forEach((prop) => {
const value = normalizeValueWithProperty(style[prop], prop);
// Ignore everything else with a null value
if (value == null) {
return;
}
switch (prop) {
// Ignore some React Native styles
case 'elevation':
case 'overlayColor':
case 'resizeMode':
case 'tintColor': {
break;
}
case 'aspectRatio': {
resolvedStyle[prop] = value.toString();
break;
}
// TODO: remove once this issue is fixed
// https://github.com/rofrischmann/inline-style-prefixer/issues/159
case 'backgroundClip': {
if (value === 'text') {
resolvedStyle.backgroundClip = value;
resolvedStyle.WebkitBackgroundClip = value;
}
break;
}
// The 'flex' property value in React Native must be a positive integer,
// 0, or -1.
case 'flex': {
if (value === -1) {
resolvedStyle.flexGrow = 0;
resolvedStyle.flexShrink = 1;
resolvedStyle.flexBasis = 'auto';
} else {
resolvedStyle.flex = value;
}
break;
}
case 'font': {
resolvedStyle[prop] = value.replace('System', SYSTEM_FONT_STACK);
break;
}
case 'fontFamily': {
if (value.indexOf('System') > -1) {
const stack = value.split(/,\s*/);
stack[stack.indexOf('System')] = SYSTEM_FONT_STACK;
resolvedStyle[prop] = stack.join(',');
} else if (value === 'monospace') {
resolvedStyle[prop] = MONOSPACE_FONT_STACK;
} else {
resolvedStyle[prop] = value;
}
break;
}
case 'fontVariant': {
Eif (Array.isArray(value) && value.length > 0) {
resolvedStyle.fontVariant = value.join(' ');
}
break;
}
case 'textAlignVertical': {
resolvedStyle.verticalAlign = value === 'center' ? 'middle' : value;
break;
}
case 'textDecorationLine': {
// use 'text-decoration' for browsers that only support CSS2
// text-decoration (e.g., IE, Edge)
if (!supportsCSS3TextDecoration) {
resolvedStyle.textDecoration = value;
} else {
resolvedStyle.textDecorationLine = value;
}
break;
}
case 'transform':
case 'transformMatrix': {
resolveTransform(resolvedStyle, style);
break;
}
case 'writingDirection': {
resolvedStyle.direction = value;
break;
}
default: {
const longFormProperties = STYLE_SHORT_FORM_EXPANSIONS[prop];
if (longFormProperties) {
longFormProperties.forEach((longForm, i) => {
// The value of any longform property in the original styles takes
// precedence over the shortform's value.
if (typeof style[longForm] === 'undefined') {
resolvedStyle[longForm] = value;
}
});
} else {
resolvedStyle[prop] = Array.isArray(value) ? value.join(',') : value;
}
}
}
});
return resolvedStyle;
};
export default createReactDOMStyle;
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