From 6eab3cff505f2d8943e43f6b85e6a2b1f8816510 Mon Sep 17 00:00:00 2001
From: Masatoshi Kimura <VYV03354@nifty.ne.jp>
Date: Sat, 7 Jul 2012 10:27:08 -0400
Subject: [PATCH] Bug 752187 - Part 8: Implement unprefixed linear-gradient
 parsing. r=dbaron

---
 layout/style/nsCSSParser.cpp | 104 ++++++++++++++++++-----------------
 1 file changed, 53 insertions(+), 51 deletions(-)

diff --git a/layout/style/nsCSSParser.cpp b/layout/style/nsCSSParser.cpp
index 4615deba98bb..102acc67a40b 100644
--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -4999,81 +4999,83 @@ CSSParserImpl::ParseLinearGradient(nsCSSValue& aValue, bool aIsRepeating,
   nsRefPtr<nsCSSValueGradient> cssGradient
     = new nsCSSValueGradient(false, aIsRepeating);
 
-  // <gradient-line>
   if (!GetToken(true)) {
     return false;
   }
 
-  bool toCorner = false;
   if (mToken.mType == eCSSToken_Ident &&
       mToken.mIdent.LowerCaseEqualsLiteral("to")) {
-    toCorner = true;
-    if (!GetToken(true)) {
+
+    // "to" syntax doesn't allow explicit "center"
+    if (!ParseBoxPositionValues(cssGradient->mBgPos, false, false)) {
+      SkipUntil(')');
       return false;
     }
+
+    // [ to [left | right] || [top | bottom] ] ,
+    const nsCSSValue& xValue = cssGradient->mBgPos.mXValue;
+    const nsCSSValue& yValue = cssGradient->mBgPos.mYValue;
+    if (xValue.GetUnit() != eCSSUnit_Enumerated ||
+        !(xValue.GetIntValue() & (NS_STYLE_BG_POSITION_LEFT |
+                                  NS_STYLE_BG_POSITION_CENTER |
+                                  NS_STYLE_BG_POSITION_RIGHT)) ||
+        yValue.GetUnit() != eCSSUnit_Enumerated ||
+        !(yValue.GetIntValue() & (NS_STYLE_BG_POSITION_TOP |
+                                  NS_STYLE_BG_POSITION_CENTER |
+                                  NS_STYLE_BG_POSITION_BOTTOM))) {
+      SkipUntil(')');
+      return false;
+    }
+
+    if (!ExpectSymbol(',', true)) {
+      SkipUntil(')');
+      return false;
+    }
+
+    return ParseGradientColorStops(cssGradient, aValue);
+  }
+
+  if (!aIsLegacy) {
+    UngetToken();
+
+    // <angle> ,
+    if (ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull) &&
+        !ExpectSymbol(',', true)) {
+      SkipUntil(')');
+      return false;
+    }
+
+    return ParseGradientColorStops(cssGradient, aValue);
   }
 
   nsCSSTokenType ty = mToken.mType;
   nsString id = mToken.mIdent;
-  cssGradient->mIsLegacySyntax = !toCorner;
   UngetToken();
 
   // <legacy-gradient-line>
   bool haveGradientLine = IsLegacyGradientLine(ty, id);
   if (haveGradientLine) {
-    if (toCorner) {
-      // "to" syntax only allows box position keywords
-      if (ty != eCSSToken_Ident) {
+    cssGradient->mIsLegacySyntax = true;
+    bool haveAngle =
+      ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull);
+
+    // if we got an angle, we might now have a comma, ending the gradient-line
+    if (!haveAngle || !ExpectSymbol(',', true)) {
+      if (!ParseBoxPositionValues(cssGradient->mBgPos, false)) {
         SkipUntil(')');
         return false;
       }
 
-      // "to" syntax doesn't allow explicit "center"
-      if (!ParseBoxPositionValues(cssGradient->mBgPos, false, false)) {
+      if (!ExpectSymbol(',', true) &&
+          // if we didn't already get an angle, we might have one now,
+          // otherwise it's an error
+          (haveAngle ||
+           !ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull) ||
+           // now we better have a comma
+           !ExpectSymbol(',', true))) {
         SkipUntil(')');
         return false;
       }
-
-      const nsCSSValue& xValue = cssGradient->mBgPos.mXValue;
-      const nsCSSValue& yValue = cssGradient->mBgPos.mYValue;
-      if (xValue.GetUnit() != eCSSUnit_Enumerated ||
-          !(xValue.GetIntValue() & (NS_STYLE_BG_POSITION_LEFT |
-                                    NS_STYLE_BG_POSITION_CENTER |
-                                    NS_STYLE_BG_POSITION_RIGHT)) ||
-          yValue.GetUnit() != eCSSUnit_Enumerated ||
-          !(yValue.GetIntValue() & (NS_STYLE_BG_POSITION_TOP |
-                                    NS_STYLE_BG_POSITION_CENTER |
-                                    NS_STYLE_BG_POSITION_BOTTOM))) {
-        SkipUntil(')');
-        return false;
-      }
-
-      if (!ExpectSymbol(',', true)) {
-        SkipUntil(')');
-        return false;
-      }
-    } else {
-      bool haveAngle =
-        ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull);
-
-      // if we got an angle, we might now have a comma, ending the gradient-line
-      if (!haveAngle || !ExpectSymbol(',', true)) {
-        if (!ParseBoxPositionValues(cssGradient->mBgPos, false)) {
-          SkipUntil(')');
-          return false;
-        }
-
-        if (!ExpectSymbol(',', true) &&
-            // if we didn't already get an angle, we might have one now,
-            // otherwise it's an error
-            (haveAngle ||
-             !ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull) ||
-             // now we better have a comma
-             !ExpectSymbol(',', true))) {
-          SkipUntil(')');
-          return false;
-        }
-      }
     }
   }