From 73f0ee7143afef71ff82e1a846fcc0dc9fc18dc5 Mon Sep 17 00:00:00 2001
From: Roman Dvornov <rdvornov@gmail.com>
Date: Thu, 12 Oct 2017 02:42:37 +0300
Subject: [PATCH] extend Declaration validator to check for known property name

---
 lib/syntax/node/Declaration.js | 122 ++++++++++++++++++---------------
 test/lexer.js                  |  13 ++++
 2 files changed, 79 insertions(+), 56 deletions(-)

diff --git a/lib/syntax/node/Declaration.js b/lib/syntax/node/Declaration.js
index 67bd3fc3..f26e9c0c 100644
--- a/lib/syntax/node/Declaration.js
+++ b/lib/syntax/node/Declaration.js
@@ -1,5 +1,5 @@
+var resolveProperty = require('../../utils/names').property;
 var TYPE = require('../../tokenizer').TYPE;
-
 var IDENTIFIER = TYPE.Identifier;
 var COLON = TYPE.Colon;
 var EXCLAMATIONMARK = TYPE.ExclamationMark;
@@ -11,9 +11,60 @@ var SEMICOLON = TYPE.Semicolon;
 var PLUSSIGN = TYPE.PlusSign;
 var NUMBERSIGN = TYPE.NumberSign;
 
+function isCustomProperty(name) {
+    return name.length >= 2 &&
+           name.charCodeAt(0) === HYPHENMINUS &&
+           name.charCodeAt(1) === HYPHENMINUS;
+}
+
+function consumeProperty() {
+    var start = this.scanner.tokenStart;
+    var prefix = 0;
+
+    // hacks
+    switch (this.scanner.tokenType) {
+        case ASTERISK:
+        case DOLLARSIGN:
+        case PLUSSIGN:
+        case NUMBERSIGN:
+            prefix = 1;
+            break;
+
+        // TODO: not sure we should support this hack
+        case SOLIDUS:
+            prefix = this.scanner.lookupType(1) === SOLIDUS ? 2 : 1;
+            break;
+    }
+
+    if (this.scanner.lookupType(prefix) === HYPHENMINUS) {
+        prefix++;
+    }
+
+    if (prefix) {
+        this.scanner.skip(prefix);
+    }
+
+    this.scanner.eat(IDENTIFIER);
+
+    return this.scanner.substrToCursor(start);
+}
+
+// ! sc* important
+function consumeImportant(scanner) {
+    scanner.eat(EXCLAMATIONMARK);
+    scanner.skipSC();
+
+    var important = scanner.consume(IDENTIFIER);
+
+    // store original value in case it differ from `important`
+    // for better original source restoring and hacks like `!ie` support
+    return important === 'important' ? true : important;
+}
+
 function consumeValueRaw(startToken) {
     return this.Raw(startToken, EXCLAMATIONMARK, SEMICOLON, false, true);
 }
+
 function consumeCustomPropertyRaw(startToken) {
     return this.Raw(startToken, EXCLAMATIONMARK, SEMICOLON, false, false);
 }
@@ -29,7 +80,7 @@ module.exports = {
     parse: function() {
         var start = this.scanner.tokenStart;
         var startToken = this.scanner.currentToken;
-        var property = readProperty.call(this);
+        var property = consumeProperty.call(this);
         var customProperty = isCustomProperty(property);
         var parseValue = customProperty ? this.parseCustomProperty : this.parseValue;
         var consumeRaw = customProperty ? consumeCustomPropertyRaw : consumeValueRaw;
@@ -60,7 +111,7 @@ module.exports = {
         }
 
         if (this.scanner.tokenType === EXCLAMATIONMARK) {
-            important = getImportant(this.scanner);
+            important = consumeImportant(this.scanner);
             this.scanner.skipSC();
         }
 
@@ -95,59 +146,18 @@ module.exports = {
         }
     },
     validate: function(node, warn) {
-        var match = this.matchDeclaration(node);
-        if (match.error) {
-            warn(node, match.error);
+        var property = resolveProperty(node.property);
+        var name = node.property.substr(property.hack.length); // TODO: replace for property.name, see https://github.com/csstree/csstree/issues/63
+        if (name.toLowerCase() in this.defs.Declaration === false) {
+            warn(node, new SyntaxError('Unknown property `' + name + '`'));
+        } else {
+            var match = this.matchDeclaration(node);
+            if (match.error) {
+                if (match.error.name === 'SyntaxMatchError' &&
+                    match.error.name === 'SyntaxReferenceError') {
+                    warn(node, match.error);
+                }
+            }
         }
     }
 };
-
-function isCustomProperty(name) {
-    return name.length >= 2 &&
-           name.charCodeAt(0) === HYPHENMINUS &&
-           name.charCodeAt(1) === HYPHENMINUS;
-}
-
-function readProperty() {
-    var start = this.scanner.tokenStart;
-    var prefix = 0;
-
-    // hacks
-    switch (this.scanner.tokenType) {
-        case ASTERISK:
-        case DOLLARSIGN:
-        case PLUSSIGN:
-        case NUMBERSIGN:
-            prefix = 1;
-            break;
-
-        // TODO: not sure we should support this hack
-        case SOLIDUS:
-            prefix = this.scanner.lookupType(1) === SOLIDUS ? 2 : 1;
-            break;
-    }
-
-    if (this.scanner.lookupType(prefix) === HYPHENMINUS) {
-        prefix++;
-    }
-
-    if (prefix) {
-        this.scanner.skip(prefix);
-    }
-
-    this.scanner.eat(IDENTIFIER);
-
-    return this.scanner.substrToCursor(start);
-}
-
-// ! ws* important
-function getImportant(scanner) {
-    scanner.eat(EXCLAMATIONMARK);
-    scanner.skipSC();
-
-    var important = scanner.consume(IDENTIFIER);
-
-    // store original value in case it differ from `important`
-    // for better original source restoring and hacks like `!ie` support
-    return important === 'important' ? true : important;
-}
diff --git a/test/lexer.js b/test/lexer.js
index d9ca7510..d03a70ce 100644
--- a/test/lexer.js
+++ b/test/lexer.js
@@ -275,6 +275,19 @@ describe('lexer', function() {
             assert.equal(errors[0].node, ast.children.last());
             assert.equal(errors[0].error.message, 'Unknown unit `toString`');
         });
+
+        it('Declaration', function() {
+            // using toString as bad name we check 2 things: bad name matching and
+            // false positive matching b/c of wrong search for name existance in dict
+            var ast = parseCss('color: red; Color: red; //color: red; //-vendor-color: red; toString: red', { context: 'declarationList' });
+            var errors = syntax.lexer.checkValidity(ast);
+
+            assert.equal(errors.length, 2);
+            assert.equal(errors[0].node, ast.children.tail.prev.data);
+            assert.equal(errors[0].error.message, 'Unknown property `-vendor-color`');
+            assert.equal(errors[1].node, ast.children.last());
+            assert.equal(errors[1].error.message, 'Unknown property `toString`');
+        });
     });
 
     describe('matchProperty()', function() {