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

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+var TYPE = require('../../tokenizer').TYPE;
+
+var IDENT = TYPE.Ident;
+var STRING = TYPE.String;
+var COLON = TYPE.Colon;
+var LEFTSQUAREBRACKET = TYPE.LeftSquareBracket;
+var RIGHTSQUAREBRACKET = TYPE.RightSquareBracket;
+var DOLLARSIGN = 0x0024;       // U+0024 DOLLAR SIGN ($)
+var ASTERISK = 0x002A;         // U+002A ASTERISK (*)
+var EQUALSSIGN = 0x003D;       // U+003D EQUALS SIGN (=)
+var CIRCUMFLEXACCENT = 0x005E; // U+005E (^)
+var VERTICALLINE = 0x007C;     // U+007C VERTICAL LINE (|)
+var TILDE = 0x007E;            // U+007E TILDE (~)
+
+function getAttributeName() {
+    if (this.scanner.eof) {
+        this.error('Unexpected end of input');
+    }
+
+    var start = this.scanner.tokenStart;
+    var expectIdent = false;
+    var checkColon = true;
+
+    if (this.scanner.isDelim(ASTERISK)) {
+        expectIdent = true;
+        checkColon = false;
+        this.scanner.next();
+    } else if (!this.scanner.isDelim(VERTICALLINE)) {
+        this.eat(IDENT);
+    }
+
+    if (this.scanner.isDelim(VERTICALLINE)) {
+        if (this.scanner.source.charCodeAt(this.scanner.tokenStart + 1) !== EQUALSSIGN) {
+            this.scanner.next();
+            this.eat(IDENT);
+        } else if (expectIdent) {
+            this.error('Identifier is expected', this.scanner.tokenEnd);
+        }
+    } else if (expectIdent) {
+        this.error('Vertical line is expected');
+    }
+
+    if (checkColon && this.scanner.tokenType === COLON) {
+        this.scanner.next();
+        this.eat(IDENT);
+    }
+
+    return {
+        type: 'Identifier',
+        loc: this.getLocation(start, this.scanner.tokenStart),
+        name: this.scanner.substrToCursor(start)
+    };
+}
+
+function getOperator() {
+    var start = this.scanner.tokenStart;
+    var code = this.scanner.source.charCodeAt(start);
+
+    if (code !== EQUALSSIGN &&        // =
+        code !== TILDE &&             // ~=
+        code !== CIRCUMFLEXACCENT &&  // ^=
+        code !== DOLLARSIGN &&        // $=
+        code !== ASTERISK &&          // *=
+        code !== VERTICALLINE         // |=
+    ) {
+        this.error('Attribute selector (=, ~=, ^=, $=, *=, |=) is expected');
+    }
+
+    this.scanner.next();
+
+    if (code !== EQUALSSIGN) {
+        if (!this.scanner.isDelim(EQUALSSIGN)) {
+            this.error('Equal sign is expected');
+        }
+
+        this.scanner.next();
+    }
+
+    return this.scanner.substrToCursor(start);
+}
+
+// '[' <wq-name> ']'
+// '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'
+module.exports = {
+    name: 'AttributeSelector',
+    structure: {
+        name: 'Identifier',
+        matcher: [String, null],
+        value: ['String', 'Identifier', null],
+        flags: [String, null]
+    },
+    parse: function() {
+        var start = this.scanner.tokenStart;
+        var name;
+        var matcher = null;
+        var value = null;
+        var flags = null;
+
+        this.eat(LEFTSQUAREBRACKET);
+        this.scanner.skipSC();
+
+        name = getAttributeName.call(this);
+        this.scanner.skipSC();
+
+        if (this.scanner.tokenType !== RIGHTSQUAREBRACKET) {
+            // avoid case `[name i]`
+            if (this.scanner.tokenType !== IDENT) {
+                matcher = getOperator.call(this);
+
+                this.scanner.skipSC();
+
+                value = this.scanner.tokenType === STRING
+                    ? this.String()
+                    : this.Identifier();
+
+                this.scanner.skipSC();
+            }
+
+            // attribute flags
+            if (this.scanner.tokenType === IDENT) {
+                flags = this.scanner.getTokenValue();
+                this.scanner.next();
+
+                this.scanner.skipSC();
+            }
+        }
+
+        this.eat(RIGHTSQUAREBRACKET);
+
+        return {
+            type: 'AttributeSelector',
+            loc: this.getLocation(start, this.scanner.tokenStart),
+            name: name,
+            matcher: matcher,
+            value: value,
+            flags: flags
+        };
+    },
+    generate: function(node) {
+        var flagsPrefix = ' ';
+
+        this.chunk('[');
+        this.node(node.name);
+
+        if (node.matcher !== null) {
+            this.chunk(node.matcher);
+
+            if (node.value !== null) {
+                this.node(node.value);
+
+                // space between string and flags is not required
+                if (node.value.type === 'String') {
+                    flagsPrefix = '';
+                }
+            }
+        }
+
+        if (node.flags !== null) {
+            this.chunk(flagsPrefix);
+            this.chunk(node.flags);
+        }
+
+        this.chunk(']');
+    }
+};