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node_modules/css-tree/lib/syntax/node/Atrule.js

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+var TYPE = require('../../tokenizer').TYPE;
+var rawMode = require('./Raw').mode;
+
+var ATKEYWORD = TYPE.AtKeyword;
+var SEMICOLON = TYPE.Semicolon;
+var LEFTCURLYBRACKET = TYPE.LeftCurlyBracket;
+var RIGHTCURLYBRACKET = TYPE.RightCurlyBracket;
+
+function consumeRaw(startToken) {
+    return this.Raw(startToken, rawMode.leftCurlyBracketOrSemicolon, true);
+}
+
+function isDeclarationBlockAtrule() {
+    for (var offset = 1, type; type = this.scanner.lookupType(offset); offset++) {
+        if (type === RIGHTCURLYBRACKET) {
+            return true;
+        }
+
+        if (type === LEFTCURLYBRACKET ||
+            type === ATKEYWORD) {
+            return false;
+        }
+    }
+
+    return false;
+}
+
+module.exports = {
+    name: 'Atrule',
+    structure: {
+        name: String,
+        prelude: ['AtrulePrelude', 'Raw', null],
+        block: ['Block', null]
+    },
+    parse: function() {
+        var start = this.scanner.tokenStart;
+        var name;
+        var nameLowerCase;
+        var prelude = null;
+        var block = null;
+
+        this.eat(ATKEYWORD);
+
+        name = this.scanner.substrToCursor(start + 1);
+        nameLowerCase = name.toLowerCase();
+        this.scanner.skipSC();
+
+        // parse prelude
+        if (this.scanner.eof === false &&
+            this.scanner.tokenType !== LEFTCURLYBRACKET &&
+            this.scanner.tokenType !== SEMICOLON) {
+            if (this.parseAtrulePrelude) {
+                prelude = this.parseWithFallback(this.AtrulePrelude.bind(this, name), consumeRaw);
+
+                // turn empty AtrulePrelude into null
+                if (prelude.type === 'AtrulePrelude' && prelude.children.head === null) {
+                    prelude = null;
+                }
+            } else {
+                prelude = consumeRaw.call(this, this.scanner.tokenIndex);
+            }
+
+            this.scanner.skipSC();
+        }
+
+        switch (this.scanner.tokenType) {
+            case SEMICOLON:
+                this.scanner.next();
+                break;
+
+            case LEFTCURLYBRACKET:
+                if (this.atrule.hasOwnProperty(nameLowerCase) &&
+                    typeof this.atrule[nameLowerCase].block === 'function') {
+                    block = this.atrule[nameLowerCase].block.call(this);
+                } else {
+                    // TODO: should consume block content as Raw?
+                    block = this.Block(isDeclarationBlockAtrule.call(this));
+                }
+
+                break;
+        }
+
+        return {
+            type: 'Atrule',
+            loc: this.getLocation(start, this.scanner.tokenStart),
+            name: name,
+            prelude: prelude,
+            block: block
+        };
+    },
+    generate: function(node) {
+        this.chunk('@');
+        this.chunk(node.name);
+
+        if (node.prelude !== null) {
+            this.chunk(' ');
+            this.node(node.prelude);
+        }
+
+        if (node.block) {
+            this.node(node.block);
+        } else {
+            this.chunk(';');
+        }
+    },
+    walkContext: 'atrule'
+};