DevTools: [CSS] Add CSS.editRangeInStyleSheetText() to the protocol

Source/core/inspector/InspectorCSSAgent.cpp

Index: Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/Source/core/inspector/InspectorCSSAgent.cpp b/Source/core/inspector/InspectorCSSAgent.cpp
index 29b4c5baefbcabef4ccf1ae5b91a5ba973dd1df9..726fbd98cb74d08a5e24f5bafe952298ad8086fb 100644
--- a/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/Source/core/inspector/InspectorCSSAgent.cpp
@@ -828,7 +828,7 @@ void InspectorCSSAgent::setStyleSheetText(ErrorString* errorString, const String
 {
     InspectorStyleSheet* inspectorStyleSheet = assertStyleSheetForId(errorString, styleSheetId);
     if (!inspectorStyleSheet) {
-        *errorString = "Style sheet with id " + styleSheetId + " not found.";
+        *errorString = "Style sheet with id " + styleSheetId + " not found";
         return;
     }
 
@@ -837,6 +837,58 @@ void InspectorCSSAgent::setStyleSheetText(ErrorString* errorString, const String
     *errorString = InspectorDOMAgent::toErrorString(exceptionState);
 }
 
+static bool extractRangeComponent(ErrorString* errorString, const RefPtr<JSONObject>& range, const String& component, unsigned& result)
+{
+    int parsedValue;
+    if (!range->getNumber(component, &parsedValue) || parsedValue < 0) {
+        *errorString = "range." + component + " must be a non-negative integer";
+        return false;
+    }
+    result = parsedValue;
+    return true;
+}
+
+void InspectorCSSAgent::editRangeInStyleSheetText(ErrorString* errorString, const String& styleSheetId, const RefPtr<JSONObject>& range, const String& text)
+{
+    InspectorStyleSheet* inspectorStyleSheet = assertStyleSheetForId(errorString, styleSheetId);
+    if (!inspectorStyleSheet) {
+        *errorString = "Stylesheet with id " + styleSheetId + " not found";
+        return;
+    }
+    unsigned startLineNumber;
+    unsigned startColumn;
+    unsigned endLineNumber;
+    unsigned endColumn;
+    if (!extractRangeComponent(errorString, range, "startLine", startLineNumber)
+        || !extractRangeComponent(errorString, range, "startColumn", startColumn)
+        || !extractRangeComponent(errorString, range, "endLine", endLineNumber)
+        || !extractRangeComponent(errorString, range, "endColumn", endColumn))
+        return;
+
+    String oldText;
+    if (!inspectorStyleSheet->getText(&oldText)) {
+        *errorString = "Failed to fetch stylesheet text";
+        return;
+    }
+
+    unsigned startOffset;
+    unsigned endOffset;
+    bool success = inspectorStyleSheet->lineNumberAndColumnToOffset(startLineNumber, startColumn, &startOffset)
+        && inspectorStyleSheet->lineNumberAndColumnToOffset(endLineNumber, endColumn, &endOffset);
+    if (!success) {
+        *errorString = "Specified range is out of bounds";
+        return;
+    }
+
+    if (startOffset > endOffset) {
+        *errorString = "Range start must not succeed its end";
+        return;
+    }
+
+    oldText.replace(startOffset, endOffset - startOffset, text);
+    setStyleSheetText(errorString, styleSheetId, oldText);
+}
+
 void InspectorCSSAgent::setPropertyText(ErrorString* errorString, const RefPtr<JSONObject>& fullStyleId, int propertyIndex, const String& text, bool overwrite, RefPtr<TypeBuilder::CSS::CSSStyle>& result)
 {
     InspectorCSSId compoundId(fullStyleId);