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var postcss = require('postcss');
var parser = require('postcss-value-parser');
var easings = {
easeInSine: 'cubic-bezier(0.47, 0, 0.745, 0.715)',
easeOutSine: 'cubic-bezier(0.39, 0.575, 0.565, 1)',
easeInOutSine: 'cubic-bezier(0.445, 0.05, 0.55, 0.95)',
easeInQuad: 'cubic-bezier(0.55, 0.085, 0.68, 0.53)',
easeOutQuad: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)',
easeInOutQuad: 'cubic-bezier(0.455, 0.03, 0.515, 0.955)',
easeInCubic: 'cubic-bezier(0.55, 0.055, 0.675, 0.19)',
easeOutCubic: 'cubic-bezier(0.215, 0.61, 0.355, 1)',
easeInOutCubic: 'cubic-bezier(0.645, 0.045, 0.355, 1)',
easeInQuart: 'cubic-bezier(0.895, 0.03, 0.685, 0.22)',
easeOutQuart: 'cubic-bezier(0.165, 0.84, 0.44, 1)',
easeInOutQuart: 'cubic-bezier(0.77, 0, 0.175, 1)',
easeInQuint: 'cubic-bezier(0.755, 0.05, 0.855, 0.06)',
easeOutQuint: 'cubic-bezier(0.23, 1, 0.32, 1)',
easeInOutQuint: 'cubic-bezier(0.86, 0, 0.07, 1)',
easeInExpo: 'cubic-bezier(0.95, 0.05, 0.795, 0.035)',
easeOutExpo: 'cubic-bezier(0.19, 1, 0.22, 1)',
easeInOutExpo: 'cubic-bezier(1, 0, 0, 1)',
easeInCirc: 'cubic-bezier(0.6, 0.04, 0.98, 0.335)',
easeOutCirc: 'cubic-bezier(0.075, 0.82, 0.165, 1)',
easeInOutCirc: 'cubic-bezier(0.785, 0.135, 0.15, 0.86)',
easeInBack: 'cubic-bezier(0.6, -0.28, 0.735, 0.045)',
easeOutBack: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
easeInOutBack: 'cubic-bezier(0.68, -0.55, 0.265, 1.55)'
};
var toSnake = function (str) {
return str.replace(/[A-Z]/g, function (letter) {
return '-' + letter.toLowerCase();
});
};
var toCamel = function (str) {
return str.replace(/-[a-z]/g, function (letter) {
return letter[1].toUpperCase();
});
};
var camels = Object.keys(easings);
for ( var i = 0; i < camels.length; i++ ) {
var camel = camels[i];
easings[toSnake(camel)] = easings[camel];
}
module.exports = postcss.plugin('postcss-easings', function (opts) {
if ( typeof opts === 'undefined' ) opts = { };
var locals = { };
if ( opts.easings ) {
for ( var name in opts.easings ) {
if ( !/^ease([\w-]+)$/.test(name) ) {
throw new Error('Custom easing ' + name + ' has bad name. ' +
'Name should start from `ease` and contain ' +
'only letters and dashes');
}
locals[name] = opts.easings[name];
if ( name.indexOf('-') !== -1 ) {
locals[toCamel(name)] = opts.easings[name];
} else if ( /[A-Z]/.test(name) ) {
locals[toSnake(name)] = opts.easings[name];
}
}
}
return function (css) {
css.walkDecls(function (decl) {
if (decl.value.indexOf('ease') === -1) return;
var root = parser(decl.value);
root.nodes = root.nodes.map(function (node) {
const value = node.value;
if (node.type === 'word' && /^ease([\w-]+)$/.test(value)) {
node.value = locals[value] || easings[value] || node.value;
}
return node;
});
decl.value = root.toString();
});
};
});
module.exports.easings = easings;
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