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(function (tree) {
tree.Media = function (value, features) {
var el = new(tree.Element)('&', null, 0),
selectors = [new(tree.Selector)([el])];
this.features = new(tree.Value)(features);
this.ruleset = new(tree.Ruleset)(selectors, value);
this.ruleset.allowImports = true;
};
tree.Media.prototype = {
toCSS: function (ctx, env) {
var features = this.features.toCSS(env);
this.ruleset.root = (ctx.length === 0 || ctx[0].multiMedia);
return '@media ' + features + (env.compress ? '{' : ' {\n ') +
this.ruleset.toCSS(ctx, env).trim().replace(/\n/g, '\n ') +
(env.compress ? '}': '\n}\n');
},
eval: function (env) {
if (!env.mediaBlocks) {
env.mediaBlocks = [];
env.mediaPath = [];
}
var blockIndex = env.mediaBlocks.length;
env.mediaPath.push(this);
env.mediaBlocks.push(this);
var media = new(tree.Media)([], []);
media.features = this.features.eval(env);
env.frames.unshift(this.ruleset);
media.ruleset = this.ruleset.eval(env);
env.frames.shift();
env.mediaBlocks[blockIndex] = media;
env.mediaPath.pop();
return env.mediaPath.length === 0 ? media.evalTop(env) :
media.evalNested(env)
},
variable: function (name) { return tree.Ruleset.prototype.variable.call(this.ruleset, name) },
find: function () { return tree.Ruleset.prototype.find.apply(this.ruleset, arguments) },
rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.ruleset) },
evalTop: function (env) {
var result = this;
// Render all dependent Media blocks.
if (env.mediaBlocks.length > 1) {
var el = new(tree.Element)('&', null, 0);
var selectors = [new(tree.Selector)([el])];
result = new(tree.Ruleset)(selectors, env.mediaBlocks);
result.multiMedia = true;
}
delete env.mediaBlocks;
delete env.mediaPath;
return result;
},
evalNested: function (env) {
var i, value,
path = env.mediaPath.concat([this]);
// Extract the media-query conditions separated with `,` (OR).
for (i = 0; i < path.length; i++) {
value = path[i].features instanceof tree.Value ?
path[i].features.value : path[i].features;
path[i] = Array.isArray(value) ? value : [value];
}
// Trace all permutations to generate the resulting media-query.
//
// (a, b and c) with nested (d, e) ->
// a and d
// a and e
// b and c and d
// b and c and e
this.features = new(tree.Value)(this.permute(path).map(function (path) {
path = path.map(function (fragment) {
return fragment.toCSS ? fragment : new(tree.Anonymous)(fragment);
});
for(i = path.length - 1; i > 0; i--) {
path.splice(i, 0, new(tree.Anonymous)("and"));
}
return new(tree.Expression)(path);
}));
// Fake a tree-node that doesn't output anything.
return new(tree.Ruleset)([], []);
},
permute: function (arr) {
if (arr.length === 0) {
return [];
} else if (arr.length === 1) {
return arr[0];
} else {
var result = [];
var rest = this.permute(arr.slice(1));
for (var i = 0; i < rest.length; i++) {
for (var j = 0; j < arr[0].length; j++) {
result.push([arr[0][j]].concat(rest[i]));
}
}
return result;
}
}
};
})(require('../tree'));
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