/// <summary>
/// Checks whether to minify the Angular binding expression in attribute
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check (true - can minify expression; false - can not minify expression)</returns>
private bool CanMinifyAngularBindingExpressionInAttribute(HtmlTag tag, HtmlAttribute attribute)
{
string tagNameInLowercase = tag.NameInLowercase;
string attributeNameInLowercase = attribute.NameInLowercase;
IList<HtmlAttribute> attributes = tag.Attributes;
bool canMinify = false;
if (tag.Flags.HasFlag(HtmlTagFlags.Custom))
{
string elementDirectiveName = AngularHelpers.NormalizeDirectiveName(tagNameInLowercase);
switch (elementDirectiveName)
{
case "ngPluralize":
canMinify = attributeNameInLowercase == "count" || attributeNameInLowercase == "when";
break;
case "ngMessages":
canMinify = attributeNameInLowercase == "for";
break;
}
}
if (!canMinify)
{
string attributeDirectiveName = AngularHelpers.NormalizeDirectiveName(attributeNameInLowercase);
canMinify = ContainsAngularBindingExpression(attributeDirectiveName);
if (!canMinify)
{
switch (attributeDirectiveName)
{
case "ngTrueValue":
case "ngFalseValue":
canMinify = tagNameInLowercase == "input" && attributes.Any(
a => a.NameInLowercase == "type" && a.Value.Trim().IgnoreCaseEquals("checkbox"));
break;
}
}
}
return canMinify;
}
/// <summary>
/// Minify a Knockout binding expression
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="attribute">Attribute</param>
/// <returns>Minified binding expression</returns>
private string MinifyKnockoutBindingExpression(MarkupParsingContext context, HtmlAttribute attribute)
{
return MinifyKnockoutBindingExpression(context, attribute.ValueCoordinates, SourceCodeNodeCoordinates.Empty,
attribute.Value);
}
/// <summary>
/// Checks whether attribute is the attribute <code>type</code> of
/// tag <code>script</code>, that containing JavaScript code
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check</returns>
private static bool IsJavaScriptTypeAttribute(HtmlTag tag, HtmlAttribute attribute)
{
return tag.NameInLowercase == "script" && attribute.NameInLowercase == "type"
&& attribute.Value.Trim().IgnoreCaseEquals(JS_CONTENT_TYPE);
}
/// <summary>
/// Builds a attribute view model
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>String representation of the attribute</returns>
private HtmlAttributeViewModel BuildAttributeViewModel(MarkupParsingContext context, HtmlTag tag, HtmlAttribute attribute)
{
string tagNameInLowercase = tag.NameInLowercase;
HtmlAttributeViewModel attributeViewModel;
string attributeName = attribute.Name;
string attributeNameInLowercase = attribute.NameInLowercase;
string attributeValue = attribute.Value;
bool attributeHasValue = attribute.HasValue;
bool attributeHasEmptyValue = !attributeHasValue || attributeValue.Length == 0;
HtmlAttributeType attributeType = attribute.Type;
bool useHtmlSyntax = !_settings.UseXhtmlSyntax;
if (useHtmlSyntax && attributeType == HtmlAttributeType.Xml && attributeNameInLowercase != "xmlns")
{
string sourceCode = context.SourceCode;
SourceCodeNodeCoordinates attributeCoordinates = attribute.NameCoordinates;
WriteWarning(LogCategoryConstants.HtmlMinificationWarning,
string.Format(Strings.WarningMessage_XmlBasedAttributeNotAllowed, attributeName), _fileContext,
attributeCoordinates.LineNumber, attributeCoordinates.ColumnNumber,
SourceCodeNavigator.GetSourceFragment(sourceCode, attributeCoordinates));
}
if ((_settings.RemoveRedundantAttributes && IsAttributeRedundant(tag, attribute))
|| (_settings.RemoveJsTypeAttributes && IsJavaScriptTypeAttribute(tag, attribute))
|| (_settings.RemoveCssTypeAttributes && IsCssTypeAttribute(tag, attribute))
|| (useHtmlSyntax && CanRemoveXmlNamespaceAttribute(tag, attribute)))
{
if (CanRemoveAttribute(tag, attribute))
{
attributeViewModel = HtmlAttributeViewModel.Empty;
return attributeViewModel;
}
}
bool isCustomBooleanAttribute = !attributeHasValue && attributeType == HtmlAttributeType.Text;
if (isCustomBooleanAttribute)
{
if (useHtmlSyntax)
{
attributeViewModel = InnerBuildAttributeViewModel(attribute, true, false);
return attributeViewModel;
}
attribute.Value = string.Empty;
}
else if (attributeType != HtmlAttributeType.Event
&& !attributeHasEmptyValue
&& TemplateTagHelpers.ContainsTag(attributeValue))
{
// Processing of template tags
StringBuilder attributeValueBuilder = StringBuilderPool.GetBuilder();
TemplateTagHelpers.ParseMarkup(attributeValue,
(localContext, expression, startDelimiter, endDelimiter) =>
{
string processedExpression = expression;
if (_settings.MinifyAngularBindingExpressions && startDelimiter == "{{" && endDelimiter == "}}")
{
processedExpression = MinifyAngularBindingExpression(context, attribute.ValueCoordinates,
localContext.NodeCoordinates, expression);
}
attributeValueBuilder.Append(startDelimiter);
attributeValueBuilder.Append(processedExpression);
attributeValueBuilder.Append(endDelimiter);
},
(localContext, textValue) =>
{
string processedTextValue = textValue;
if (attributeType == HtmlAttributeType.ClassName)
{
processedTextValue = Utils.CollapseWhitespace(textValue);
}
attributeValueBuilder.Append(processedTextValue);
}
);
string processedAttributeValue = attributeValueBuilder.ToString();
StringBuilderPool.ReleaseBuilder(attributeValueBuilder);
switch (attributeType)
{
case HtmlAttributeType.Uri:
case HtmlAttributeType.Numeric:
case HtmlAttributeType.ClassName:
processedAttributeValue = processedAttributeValue.Trim();
break;
case HtmlAttributeType.Style:
processedAttributeValue = processedAttributeValue.Trim();
processedAttributeValue = Utils.RemoveEndingSemicolon(processedAttributeValue);
break;
default:
if (_settings.MinifyAngularBindingExpressions && tag.Flags.HasFlag(HtmlTagFlags.Custom))
{
string elementDirectiveName = AngularHelpers.NormalizeDirectiveName(tagNameInLowercase);
if (elementDirectiveName == "ngPluralize" && attributeNameInLowercase == "when")
{
processedAttributeValue = MinifyAngularBindingExpression(context, attribute.ValueCoordinates,
processedAttributeValue);
}
}
break;
}
attribute.Value = processedAttributeValue;
}
else if (attributeType == HtmlAttributeType.Boolean)
{
if (_settings.CollapseBooleanAttributes)
{
attributeViewModel = InnerBuildAttributeViewModel(attribute, true, false);
return attributeViewModel;
}
attribute.Value = attributeName;
}
else
{
if (!attributeHasEmptyValue)
{
attribute.Value = CleanAttributeValue(context, tag, attribute);
}
if (_settings.RemoveEmptyAttributes && CanRemoveEmptyAttribute(tag, attribute))
{
if (CanRemoveAttribute(tag, attribute))
{
attributeViewModel = HtmlAttributeViewModel.Empty;
return attributeViewModel;
}
}
}
bool addQuotes = !CanRemoveAttributeQuotes(attribute, _settings.AttributeQuotesRemovalMode);
attributeViewModel = InnerBuildAttributeViewModel(attribute, false, addQuotes);
return attributeViewModel;
}
/// <summary>
/// Parses a start tag
/// </summary>
/// <param name="tagName">Tag name</param>
/// <param name="tagNameInLowercase">Tag name in lowercase</param>
/// <param name="attributes">List of attributes</param>
/// <param name="isEmptyTag">Flag that tag is empty</param>
private void ParseStartTag(string tagName, string tagNameInLowercase, List <HtmlAttribute> attributes,
bool isEmptyTag)
{
HtmlTagFlags tagFlags = GetTagFlagsByName(tagNameInLowercase);
if (tagFlags.IsSet(HtmlTagFlags.Optional))
{
HtmlTag lastStackedTag = _tagStack.LastOrDefault();
if (lastStackedTag != null && lastStackedTag.NameInLowercase == tagNameInLowercase)
{
ParseEndTag(lastStackedTag.Name, lastStackedTag.NameInLowercase);
}
else
{
if (tagNameInLowercase == "body" && _tagStack.Any(t => t.NameInLowercase == "head"))
{
HtmlTag headTag = _tagStack.First(t => t.NameInLowercase == "head");
ParseEndTag(headTag.Name, headTag.NameInLowercase);
}
}
}
if (tagFlags.IsSet(HtmlTagFlags.Empty))
{
isEmptyTag = true;
}
else if (isEmptyTag)
{
tagFlags |= HtmlTagFlags.Empty;
}
int attributeCount = attributes.Count;
for (int attributeIndex = 0; attributeIndex < attributeCount; attributeIndex++)
{
HtmlAttribute attribute = attributes[attributeIndex];
attribute.Type = _attributeTypeDeterminer.GetAttributeType(tagNameInLowercase, tagFlags,
attribute.NameInLowercase, attributes);
}
var tag = new HtmlTag(tagName, tagNameInLowercase, attributes, tagFlags);
if (!isEmptyTag)
{
if (_conditionalCommentOpened)
{
HtmlConditionalComment lastConditionalComment = _conditionalCommentStack.Peek();
HtmlConditionalCommentType lastConditionalCommentType = lastConditionalComment.Type;
if (tagFlags.IsSet(HtmlTagFlags.EmbeddedCode) ||
lastConditionalCommentType == HtmlConditionalCommentType.RevealedValidating ||
lastConditionalCommentType == HtmlConditionalCommentType.RevealedValidatingSimplified)
{
_tagStack.Add(tag);
}
}
else
{
_tagStack.Add(tag);
}
}
_handlers.StartTag?.Invoke(_context, tag);
if (tagFlags.IsSet(HtmlTagFlags.Xml) && !tagFlags.IsSet(HtmlTagFlags.NonIndependent))
{
_xmlTagStack.Push(tagNameInLowercase);
}
}
/// <summary>
/// Checks whether the attribute is custom
/// </summary>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check</returns>
private static bool IsCustomAttribute(HtmlAttribute attribute)
{
bool isCustomAttribute = false;
if (attribute.Type == HtmlAttributeType.Text)
{
string attributeNameInLowercase = attribute.NameInLowercase;
int charCount = attributeNameInLowercase.Length;
for (int charIndex = 0; charIndex < charCount; charIndex++)
{
char charValue = attributeNameInLowercase[charIndex];
if (!charValue.IsAlphaLower())
{
isCustomAttribute = true;
break;
}
}
if (isCustomAttribute)
{
isCustomAttribute = attributeNameInLowercase != "accept-charset"
&& attributeNameInLowercase != "http-equiv";
}
}
return isCustomAttribute;
}
/// <summary>
/// Checks whether remove an the <code>xmlns</code> attribute
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check (true - can be removed; false - can not be removed)</returns>
private static bool CanRemoveXmlNamespaceAttribute(HtmlTag tag, HtmlAttribute attribute)
{
return tag.NameInLowercase == "html" && attribute.NameInLowercase == "xmlns";
}
/// <summary>
/// Builds a string representation of the attribute
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="attribute">HTML attribute</param>
/// <param name="tag">HTML tag</param>
/// <returns>String representation of the attribute</returns>
private string BuildAttributeString(MarkupParsingContext context, HtmlTag tag, HtmlAttribute attribute)
{
string tagName = tag.Name;
HtmlTagFlags tagFlags = tag.Flags;
IList<HtmlAttribute> attributes = tag.Attributes;
string attributeString;
string attributeName = attribute.Name;
string attributeValue = attribute.Value;
bool attributeHasValue = attribute.HasValue;
HtmlAttributeType attributeType = attribute.Type;
bool useHtmlSyntax = !_settings.UseXhtmlSyntax;
if (useHtmlSyntax && IsXmlAttribute(attributeName))
{
string sourceCode = context.SourceCode;
SourceCodeNodeCoordinates attributeCoordinates = attribute.NameCoordinates;
WriteWarning(LogCategoryConstants.HtmlMinificationWarning,
string.Format(Strings.WarningMessage_XmlBasedAttributeNotAllowed, attributeName), _fileContext,
attributeCoordinates.LineNumber, attributeCoordinates.ColumnNumber,
SourceCodeNavigator.GetSourceFragment(sourceCode, attributeCoordinates));
}
if ((_settings.RemoveRedundantAttributes && IsAttributeRedundant(tagName, attributeName, attributeValue, attributes))
|| (_settings.RemoveJsTypeAttributes && IsJavaScriptTypeAttribute(tagName, attributeName, attributeValue))
|| (_settings.RemoveCssTypeAttributes && IsCssTypeAttribute(tagName, attributeName, attributeValue, attributes))
|| (useHtmlSyntax && CanRemoveXmlAttribute(tagName, attributeName)))
{
attributeString = string.Empty;
return attributeString;
}
bool isCustomBooleanAttribute = (!attributeHasValue && attributeType == HtmlAttributeType.Text);
if (isCustomBooleanAttribute && useHtmlSyntax)
{
attributeString = " " + attributeName;
return attributeString;
}
if (attributeType == HtmlAttributeType.Boolean)
{
if (_settings.CollapseBooleanAttributes)
{
attributeString = " " + attributeName;
return attributeString;
}
attributeValue = attributeName;
}
else if (isCustomBooleanAttribute)
{
attributeValue = string.Empty;
}
else
{
attributeValue = CleanAttributeValue(context, tag, attribute);
if (_settings.RemoveEmptyAttributes
&& CanRemoveEmptyAttribute(tagName, attributeName, attributeValue, attributeType))
{
attributeString = string.Empty;
return attributeString;
}
}
bool addQuotes = !CanRemoveAttributeQuotes(tagFlags, attributeValue, _settings.AttributeQuotesRemovalMode);
attributeString = InnerBuildAttributeString(attributeName, attributeValue, addQuotes);
return attributeString;
}
/// <summary>
/// Checks whether it is possible to remove the attribute quotes
/// </summary>
/// <param name="attribute">Attribute</param>
/// <param name="attributeQuotesRemovalMode">Removal mode of HTML attribute quotes</param>
/// <returns>Result of check (true - can remove; false - cannot remove)</returns>
private static bool CanRemoveAttributeQuotes(HtmlAttribute attribute,
HtmlAttributeQuotesRemovalMode attributeQuotesRemovalMode)
{
string attributeValue = attribute.Value;
bool result = false;
if (attributeQuotesRemovalMode != HtmlAttributeQuotesRemovalMode.KeepQuotes)
{
if (!attributeValue.EndsWith("/"))
{
if (attributeQuotesRemovalMode == HtmlAttributeQuotesRemovalMode.Html4)
{
result = _html4AttributeValueNotRequireQuotesRegex.IsMatch(attributeValue);
}
else if (attributeQuotesRemovalMode == HtmlAttributeQuotesRemovalMode.Html5)
{
result = CommonRegExps.Html5AttributeValueNotRequireQuotes.IsMatch(attributeValue);
}
}
}
return result;
}
/// <summary>
/// Checks whether remove an the attribute, that has empty value
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check (true - can be removed; false - can not be removed)</returns>
private static bool CanRemoveEmptyAttribute(HtmlTag tag, HtmlAttribute attribute)
{
string tagNameInLowercase = tag.NameInLowercase;
string attributeNameInLowercase = attribute.NameInLowercase;
string attributeValue = attribute.Value;
HtmlAttributeType attributeType = attribute.Type;
bool result = false;
bool isZeroLengthString = attributeValue.Length == 0;
if (isZeroLengthString || string.IsNullOrWhiteSpace(attributeValue))
{
if (tagNameInLowercase == "input" && attributeNameInLowercase == "value")
{
result = isZeroLengthString;
}
else if (attributeType == HtmlAttributeType.Event
|| (tagNameInLowercase == "form" && attributeNameInLowercase == "action")
|| _emptyAttributesForRemoval.Contains(attributeNameInLowercase))
{
result = true;
}
}
return result;
}
private HtmlAttributeViewModel InnerBuildAttributeViewModel(HtmlAttribute attribute, bool omitValue,
bool addQuotes)
{
string displayAttributeName = CanPreserveCase() ? attribute.Name : attribute.NameInLowercase;
string encodedAttributeValue = !omitValue ?
HtmlAttribute.HtmlAttributeEncode(attribute.Value, HtmlAttributeQuotesType.Double) : null;
var attributeViewModel = new HtmlAttributeViewModel(displayAttributeName, encodedAttributeValue, addQuotes);
return attributeViewModel;
}
/// <summary>
/// Cleans a attribute value
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Processed attribute value</returns>
private string CleanAttributeValue(MarkupParsingContext context, HtmlTag tag, HtmlAttribute attribute)
{
string attributeValue = attribute.Value;
if (attributeValue.Length == 0)
{
return attributeValue;
}
string processedAttributeValue = attributeValue;
string tagNameInLowercase = tag.NameInLowercase;
IList<HtmlAttribute> attributes = tag.Attributes;
string attributeNameInLowercase = attribute.NameInLowercase;
HtmlAttributeType attributeType = attribute.Type;
switch (attributeType)
{
case HtmlAttributeType.Uri:
processedAttributeValue = processedAttributeValue.Trim();
if (processedAttributeValue.StartsWith(HTTP_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
if (_settings.RemoveHttpProtocolFromAttributes && !ContainsRelExternalAttribute(attributes))
{
int httpProtocolLength = HTTP_PROTOCOL.Length;
processedAttributeValue = processedAttributeValue.Substring(httpProtocolLength);
}
}
else if (processedAttributeValue.StartsWith(HTTPS_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
if (_settings.RemoveHttpsProtocolFromAttributes && !ContainsRelExternalAttribute(attributes))
{
int httpsProtocolLength = HTTPS_PROTOCOL.Length;
processedAttributeValue = processedAttributeValue.Substring(httpsProtocolLength);
}
}
else if (attributeNameInLowercase == "href"
&& processedAttributeValue.StartsWith(JS_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
processedAttributeValue = ProcessInlineScriptContent(context, attribute);
}
break;
case HtmlAttributeType.Numeric:
processedAttributeValue = processedAttributeValue.Trim();
break;
case HtmlAttributeType.ClassName:
if (AngularHelpers.IsClassDirective(processedAttributeValue))
{
// Processing of Angular class directives
string ngOriginalDirectiveName = string.Empty;
string ngNormalizedDirectiveName = string.Empty;
string ngExpression;
var ngDirectives = new Dictionary<string, string>();
AngularHelpers.ParseClassDirective(processedAttributeValue,
(localContext, originalDirectiveName, normalizedDirectiveName) =>
{
ngOriginalDirectiveName = originalDirectiveName;
ngNormalizedDirectiveName = normalizedDirectiveName;
ngExpression = null;
ngDirectives.Add(ngOriginalDirectiveName, ngExpression);
},
(localContext, expression) =>
{
ngExpression = expression;
if (_settings.MinifyAngularBindingExpressions
&& ContainsAngularBindingExpression(ngNormalizedDirectiveName))
{
ngExpression = MinifyAngularBindingExpression(context,
attribute.ValueCoordinates, localContext.NodeCoordinates,
expression);
}
ngDirectives[ngOriginalDirectiveName] = ngExpression;
},
localContext =>
{
if (ngDirectives[ngOriginalDirectiveName] == null)
{
ngDirectives[ngOriginalDirectiveName] = string.Empty;
}
}
);
int directiveCount = ngDirectives.Count;
if (directiveCount > 0)
{
StringBuilder directiveBuilder = StringBuilderPool.GetBuilder();
int directiveIndex = 0;
int lastDirectiveIndex = directiveCount - 1;
string previousExpression = null;
foreach (var directive in ngDirectives)
{
string directiveName = directive.Key;
string expression = directive.Value;
if (directiveIndex > 0 && (expression == null || previousExpression == null))
{
directiveBuilder.Append(" ");
}
directiveBuilder.Append(directiveName);
if (!string.IsNullOrWhiteSpace(expression))
{
directiveBuilder.AppendFormat(":{0}", expression);
}
if (directiveIndex < lastDirectiveIndex && expression != null)
{
directiveBuilder.Append(";");
}
previousExpression = expression;
directiveIndex++;
}
processedAttributeValue = directiveBuilder.ToString();
StringBuilderPool.ReleaseBuilder(directiveBuilder);
}
else
{
processedAttributeValue = string.Empty;
}
}
else
{
processedAttributeValue = processedAttributeValue.Trim();
processedAttributeValue = Utils.CollapseWhitespace(processedAttributeValue);
}
break;
case HtmlAttributeType.Style:
processedAttributeValue = ProcessInlineStyleContent(context, attribute);
break;
case HtmlAttributeType.Event:
processedAttributeValue = ProcessInlineScriptContent(context, attribute);
break;
default:
if (attributeNameInLowercase == "data-bind" && _settings.MinifyKnockoutBindingExpressions)
{
processedAttributeValue = MinifyKnockoutBindingExpression(context, attribute);
}
else if (tagNameInLowercase == "meta" && attributeNameInLowercase == "content"
&& attributes.Any(a => a.NameInLowercase == "name" && a.Value.Trim().IgnoreCaseEquals("keywords")))
{
processedAttributeValue = processedAttributeValue.Trim();
processedAttributeValue = Utils.CollapseWhitespace(processedAttributeValue);
processedAttributeValue = _separatingCommaWithSpacesRegex.Replace(processedAttributeValue, ",");
processedAttributeValue = _endingCommaWithSpacesRegex.Replace(processedAttributeValue, string.Empty);
}
else
{
if (_settings.MinifyAngularBindingExpressions
&& CanMinifyAngularBindingExpressionInAttribute(tag, attribute))
{
processedAttributeValue = MinifyAngularBindingExpression(context, attribute.ValueCoordinates,
processedAttributeValue);
}
}
break;
}
return processedAttributeValue;
}
/// <summary>
/// Checks whether remove an the attribute
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check (true - can be removed; false - can not be removed)</returns>
private bool CanRemoveAttribute(HtmlTag tag, HtmlAttribute attribute)
{
if (_settings.PreservableAttributeCollection.Count == 0)
{
return true;
}
string tagNameInLowercase = tag.NameInLowercase;
string attributeNameInLowercase = attribute.NameInLowercase;
string attributeValue = attribute.Value;
bool result = true;
foreach (HtmlAttributeExpression attributeExpression in _settings.PreservableAttributeCollection)
{
bool cannotRemove = attributeExpression.IsMatch(tagNameInLowercase, attributeNameInLowercase,
attributeValue);
if (cannotRemove)
{
result = false;
break;
}
}
return result;
}
/// <summary>
/// Processes a inline script content
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="attribute">Attribute</param>
/// <returns>Processed inline script content</returns>
private string ProcessInlineScriptContent(MarkupParsingContext context, HtmlAttribute attribute)
{
string scriptContent = attribute.Value;
bool forHrefAttribute = (attribute.Name == "href");
string result = scriptContent;
if (_settings.MinifyInlineJsCode && _jsMinifier.IsInlineCodeMinificationSupported)
{
bool isJavascriptProtocolRemoved = false;
if (scriptContent.StartsWith(JS_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
result = _jsProtocolRegex.Replace(result, string.Empty);
isJavascriptProtocolRemoved = true;
}
CodeMinificationResult minificationResult = _jsMinifier.Minify(result, true);
if (minificationResult.Errors.Count == 0)
{
result = minificationResult.MinifiedContent ?? string.Empty;
}
if (minificationResult.Errors.Count > 0 || minificationResult.Warnings.Count > 0)
{
string sourceCode = context.SourceCode;
SourceCodeNodeCoordinates tagCoordinates = context.NodeCoordinates;
SourceCodeNodeCoordinates attributeCoordinates = attribute.ValueCoordinates;
foreach (MinificationErrorInfo error in minificationResult.Errors)
{
var relativeErrorCoordinates = new SourceCodeNodeCoordinates(error.LineNumber, error.ColumnNumber);
SourceCodeNodeCoordinates absoluteErrorCoordinates = CalculateAbsoluteInlineCodeErrorCoordinates(
tagCoordinates, attributeCoordinates, relativeErrorCoordinates);
string sourceFragment = SourceCodeNavigator.GetSourceFragment(
sourceCode, absoluteErrorCoordinates);
string message = error.Message.Trim();
WriteError(LogCategoryConstants.JsMinificationError, message, _fileContext,
absoluteErrorCoordinates.LineNumber, absoluteErrorCoordinates.ColumnNumber, sourceFragment);
}
foreach (MinificationErrorInfo warning in minificationResult.Warnings)
{
var relativeErrorCoordinates = new SourceCodeNodeCoordinates(warning.LineNumber, warning.ColumnNumber);
SourceCodeNodeCoordinates absoluteErrorCoordinates = CalculateAbsoluteInlineCodeErrorCoordinates(
tagCoordinates, attributeCoordinates, relativeErrorCoordinates);
string sourceFragment = SourceCodeNavigator.GetSourceFragment(
sourceCode, absoluteErrorCoordinates);
string message = warning.Message.Trim();
WriteWarning(LogCategoryConstants.JsMinificationWarning, message, _fileContext,
absoluteErrorCoordinates.LineNumber, absoluteErrorCoordinates.ColumnNumber, sourceFragment);
}
}
if (isJavascriptProtocolRemoved
&& (forHrefAttribute || !_settings.RemoveJsProtocolFromAttributes))
{
result = JS_PROTOCOL + result;
}
}
else
{
result = result.Trim();
if (!forHrefAttribute && _settings.RemoveJsProtocolFromAttributes)
{
result = _jsProtocolRegex.Replace(result, string.Empty);
}
}
result = Utils.RemoveEndingSemicolon(result);
return result;
}
/// <summary>
/// Checks whether the attribute is redundant
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check (true - is redundant; false - is not redundant)</returns>
private static bool IsAttributeRedundant(HtmlTag tag, HtmlAttribute attribute)
{
string tagNameInLowercase = tag.NameInLowercase;
IList<HtmlAttribute> attributes = tag.Attributes;
string attributeNameInLowercase = attribute.NameInLowercase;
string attributeValue = attribute.Value;
string processedAttributeValue = attributeValue.Trim();
return (
(tagNameInLowercase == "script"
&& ((attributeNameInLowercase == "language" && processedAttributeValue.IgnoreCaseEquals("javascript"))
|| (attributeNameInLowercase == "charset" && attributes.All(a => a.NameInLowercase != "src"))))
|| (tagNameInLowercase == "link" && attributeNameInLowercase == "charset" && attributes.Any(
a => a.NameInLowercase == "rel" && a.Value.Trim().IgnoreCaseEquals("stylesheet")))
|| (tagNameInLowercase == "form" && attributeNameInLowercase == "method"
&& processedAttributeValue.IgnoreCaseEquals("get"))
|| (tagNameInLowercase == "input" && attributeNameInLowercase == "type"
&& processedAttributeValue.IgnoreCaseEquals("text"))
|| (tagNameInLowercase == "a" && attributeNameInLowercase == "name" && attributes.Any(
a => a.NameInLowercase == "id" && a.Value == attributeValue))
|| (tagNameInLowercase == "area" && attributeNameInLowercase == "shape"
&& processedAttributeValue.IgnoreCaseEquals("rect"))
);
}
/// <summary>
/// Processes a inline style content
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="attribute">Attribute</param>
/// <returns>Processed inline style content</returns>
private string ProcessInlineStyleContent(MarkupParsingContext context, HtmlAttribute attribute)
{
string styleContent = attribute.Value;
string result = styleContent;
if (_settings.MinifyInlineCssCode && _cssMinifier.IsInlineCodeMinificationSupported)
{
CodeMinificationResult minificationResult = _cssMinifier.Minify(result, true);
if (minificationResult.Errors.Count == 0)
{
result = minificationResult.MinifiedContent ?? string.Empty;
}
if (minificationResult.Errors.Count > 0 || minificationResult.Warnings.Count > 0)
{
string sourceCode = context.SourceCode;
SourceCodeNodeCoordinates tagCoordinates = context.NodeCoordinates;
SourceCodeNodeCoordinates attributeCoordinates = attribute.ValueCoordinates;
foreach (MinificationErrorInfo error in minificationResult.Errors)
{
var relativeErrorCoordinates = new SourceCodeNodeCoordinates(error.LineNumber, error.ColumnNumber);
SourceCodeNodeCoordinates absoluteErrorCoordinates = CalculateAbsoluteInlineCodeErrorCoordinates(
tagCoordinates, attributeCoordinates, relativeErrorCoordinates);
string sourceFragment = SourceCodeNavigator.GetSourceFragment(
sourceCode, absoluteErrorCoordinates);
string message = error.Message.Trim();
WriteError(LogCategoryConstants.CssMinificationError, message, _fileContext,
absoluteErrorCoordinates.LineNumber, absoluteErrorCoordinates.ColumnNumber, sourceFragment);
}
foreach (MinificationErrorInfo warning in minificationResult.Warnings)
{
var relativeErrorCoordinates = new SourceCodeNodeCoordinates(warning.LineNumber, warning.ColumnNumber);
SourceCodeNodeCoordinates absoluteErrorCoordinates = CalculateAbsoluteInlineCodeErrorCoordinates(
tagCoordinates, attributeCoordinates, relativeErrorCoordinates);
string sourceFragment = SourceCodeNavigator.GetSourceFragment(
sourceCode, absoluteErrorCoordinates);
string message = warning.Message.Trim();
WriteWarning(LogCategoryConstants.CssMinificationWarning, message, _fileContext,
absoluteErrorCoordinates.LineNumber, absoluteErrorCoordinates.ColumnNumber, sourceFragment);
}
}
}
else
{
result = result.Trim();
}
result = Utils.RemoveEndingSemicolon(result);
return result;
}
/// <summary>
/// Checks whether attribute is the attribute <code>type</code> of tag <code>link</code>
/// or <code>style</code>, that containing CSS code
/// </summary>
/// <param name="tag">Tag</param>
/// <param name="attribute">Attribute</param>
/// <returns>Result of check</returns>
private static bool IsCssTypeAttribute(HtmlTag tag, HtmlAttribute attribute)
{
string tagNameInLowercase = tag.NameInLowercase;
string attributeNameInLowercase = attribute.NameInLowercase;
string attributeValue = attribute.Value;
IList<HtmlAttribute> attributes = tag.Attributes;
bool isCssTypeAttribute = false;
if (tagNameInLowercase == "link" || tagNameInLowercase == "style")
{
string processedAttributeValue = attributeValue.Trim();
if (attributeNameInLowercase == "type" && processedAttributeValue.IgnoreCaseEquals(CSS_CONTENT_TYPE))
{
if (tagNameInLowercase == "link")
{
isCssTypeAttribute = attributes.Any(a => a.NameInLowercase == "rel"
&& a.Value.Trim().IgnoreCaseEquals("stylesheet"));
}
else if (tagNameInLowercase == "style")
{
isCssTypeAttribute = true;
}
}
}
return isCssTypeAttribute;
}
/// <summary>
/// Cleans a attribute value
/// </summary>
/// <param name="context">Markup parsing context</param>
/// <param name="tag">HTML tag</param>
/// <param name="attribute">HTML attribute</param>
/// <returns>Processed attribute value</returns>
private string CleanAttributeValue(MarkupParsingContext context, HtmlTag tag, HtmlAttribute attribute)
{
string attributeValue = attribute.Value;
if (attributeValue.Length == 0)
{
return attributeValue;
}
string result = attributeValue;
string tagName = tag.Name;
IList<HtmlAttribute> attributes = tag.Attributes;
string attributeName = attribute.Name;
HtmlAttributeType attributeType = attribute.Type;
if (attributeType != HtmlAttributeType.Event && MustacheStyleTagHelpers.ContainsMustacheStyleTag(result))
{
// Processing of Angular Mustache-style tags
var attributeValueBuilder = new StringBuilder();
MustacheStyleTagHelpers.ParseMarkup(result,
(localContext, expression, startDelimiter, endDelimiter) =>
{
string processedExpression = expression;
if (_settings.MinifyAngularBindingExpressions && startDelimiter == "{{" && endDelimiter == "}}")
{
processedExpression = MinifyAngularBindingExpression(context, attribute.ValueCoordinates,
localContext.NodeCoordinates, expression);
}
attributeValueBuilder.Append(startDelimiter);
attributeValueBuilder.Append(processedExpression);
attributeValueBuilder.Append(endDelimiter);
},
(localContext, textValue) =>
{
string processedTextValue = textValue;
if (attributeType == HtmlAttributeType.ClassName)
{
processedTextValue = Utils.CollapseWhitespace(textValue);
}
attributeValueBuilder.Append(processedTextValue);
}
);
result = attributeValueBuilder.ToString();
attributeValueBuilder.Clear();
switch (attributeType)
{
case HtmlAttributeType.Uri:
case HtmlAttributeType.Numeric:
case HtmlAttributeType.ClassName:
result = result.Trim();
break;
case HtmlAttributeType.Style:
result = result.Trim();
result = Utils.RemoveEndingSemicolon(result);
break;
default:
if (_settings.MinifyAngularBindingExpressions)
{
string elementDirectiveName = AngularHelpers.NormalizeDirectiveName(tagName);
if (elementDirectiveName == "ngPluralize" && attributeName == "when")
{
result = MinifyAngularBindingExpression(context, attribute.ValueCoordinates, result);
}
}
break;
}
}
else
{
switch (attributeType)
{
case HtmlAttributeType.Uri:
result = result.Trim();
if (result.StartsWith(HTTP_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
if (_settings.RemoveHttpProtocolFromAttributes && !ContainsRelExternalAttribute(attributes))
{
int httpProtocolLength = HTTP_PROTOCOL.Length;
result = result.Substring(httpProtocolLength);
}
}
else if (result.StartsWith(HTTPS_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
if (_settings.RemoveHttpsProtocolFromAttributes && !ContainsRelExternalAttribute(attributes))
{
int httpsProtocolLength = HTTPS_PROTOCOL.Length;
result = result.Substring(httpsProtocolLength);
}
}
else if (result == "href" && result.StartsWith(JS_PROTOCOL, StringComparison.OrdinalIgnoreCase))
{
result = ProcessInlineScriptContent(context, attribute);
}
break;
case HtmlAttributeType.Numeric:
result = result.Trim();
break;
case HtmlAttributeType.ClassName:
if (AngularHelpers.IsClassDirective(result))
{
// Processing of Angular class directives
string ngOriginalDirectiveName = string.Empty;
string ngNormalizedDirectiveName = string.Empty;
string ngExpression;
var ngDirectives = new Dictionary<string, string>();
AngularHelpers.ParseClassDirective(result,
(localContext, originalDirectiveName, normalizedDirectiveName) =>
{
ngOriginalDirectiveName = originalDirectiveName;
ngNormalizedDirectiveName = normalizedDirectiveName;
ngExpression = null;
ngDirectives.Add(ngOriginalDirectiveName, ngExpression);
},
(localContext, expression) =>
{
ngExpression = expression;
if (_settings.MinifyAngularBindingExpressions
&& ContainsAngularBindingExpression(ngNormalizedDirectiveName))
{
ngExpression = MinifyAngularBindingExpression(context,
attribute.ValueCoordinates, localContext.NodeCoordinates,
expression);
}
ngDirectives[ngOriginalDirectiveName] = ngExpression;
},
localContext =>
{
if (ngDirectives[ngOriginalDirectiveName] == null)
{
ngDirectives[ngOriginalDirectiveName] = string.Empty;
}
}
);
int directiveCount = ngDirectives.Count;
if (directiveCount > 0)
{
var directiveBuilder = new StringBuilder();
int directiveIndex = 0;
int lastDirectiveIndex = directiveCount - 1;
string previousExpression = null;
foreach (var directive in ngDirectives)
{
string directiveName = directive.Key;
string expression = directive.Value;
if (directiveIndex > 0 && (expression == null || previousExpression == null))
{
directiveBuilder.Append(" ");
}
directiveBuilder.Append(directiveName);
if (!string.IsNullOrWhiteSpace(expression))
{
directiveBuilder.AppendFormat(":{0}", expression);
}
if (directiveIndex < lastDirectiveIndex && expression != null)
{
directiveBuilder.Append(";");
}
previousExpression = expression;
directiveIndex++;
}
result = directiveBuilder.ToString();
directiveBuilder.Clear();
}
else
{
result = string.Empty;
}
}
else
{
result = result.Trim();
result = Utils.CollapseWhitespace(result);
}
break;
case HtmlAttributeType.Style:
result = ProcessInlineStyleContent(context, attribute);
break;
case HtmlAttributeType.Event:
result = ProcessInlineScriptContent(context, attribute);
break;
default:
if (attributeName == "data-bind" && _settings.MinifyKnockoutBindingExpressions)
{
result = MinifyKnockoutBindingExpression(context, attribute);
}
else if (tagName == "meta" && attributeName == "content"
&& attributes.Any(a => a.Name == "name" && a.Value.Trim().IgnoreCaseEquals("keywords")))
{
result = result.Trim();
result = Utils.CollapseWhitespace(result);
result = _separatingCommaWithSpacesRegex.Replace(result, ",");
result = _endingCommaWithSpacesRegex.Replace(result, string.Empty);
}
else
{
if (_settings.MinifyAngularBindingExpressions
&& CanMinifyAngularBindingExpressionInAttribute(tagName, attributeName, attributes))
{
result = MinifyAngularBindingExpression(context, attribute.ValueCoordinates, result);
}
}
break;
}
}
return result;
}
/// <summary>
/// Process a attributes
/// </summary>
/// <returns>List of attributes</returns>
private List <HtmlAttribute> ProcessAttributes()
{
string content = _innerContext.SourceCode;
int currentPosition = _innerContext.Position;
SourceCodeNodeCoordinates currentCoordinates = _innerContext.NodeCoordinates;
Match match = _attributeRegex.Match(content, currentPosition, _innerContext.RemainderLength);
while (match.Success)
{
GroupCollection groups = match.Groups;
Group attributeNameGroup = groups["attributeName"];
Group attributeEqualSignGroup = groups["attributeEqualSign"];
Group attributeValueGroup = groups["attributeValue"];
string attributeName = attributeNameGroup.Value;
string attributeNameInLowercase = attributeName;
if (Utils.ContainsUppercaseCharacters(attributeName))
{
attributeNameInLowercase = attributeName.ToLowerInvariant();
}
string attributeValue = null;
if (attributeEqualSignGroup.Success)
{
if (attributeValueGroup.Success)
{
attributeValue = attributeValueGroup.Value;
if (!string.IsNullOrWhiteSpace(attributeValue))
{
attributeValue = HtmlAttributeValueHelpers.Decode(attributeValue);
}
}
else
{
attributeValue = string.Empty;
}
}
var attributeNameCoordinates = SourceCodeNodeCoordinates.Empty;
int attributeNamePosition = -1;
if (attributeNameGroup.Success)
{
attributeNamePosition = attributeNameGroup.Index;
}
if (attributeNamePosition != -1)
{
int lineBreakCount;
int charRemainderCount;
SourceCodeNavigator.CalculateLineBreakCount(content, currentPosition,
attributeNamePosition - currentPosition, out lineBreakCount, out charRemainderCount);
attributeNameCoordinates = SourceCodeNavigator.CalculateAbsoluteNodeCoordinates(
currentCoordinates, lineBreakCount, charRemainderCount);
currentPosition = attributeNamePosition;
currentCoordinates = attributeNameCoordinates;
}
var attributeValueCoordinates = SourceCodeNodeCoordinates.Empty;
int attributeValuePosition = -1;
if (attributeValueGroup.Success)
{
attributeValuePosition = attributeValueGroup.Index;
}
if (attributeValuePosition != -1)
{
int lineBreakCount;
int charRemainderCount;
SourceCodeNavigator.CalculateLineBreakCount(content, currentPosition,
attributeValuePosition - currentPosition, out lineBreakCount, out charRemainderCount);
attributeValueCoordinates = SourceCodeNavigator.CalculateAbsoluteNodeCoordinates(
currentCoordinates, lineBreakCount, charRemainderCount);
currentPosition = attributeValuePosition;
currentCoordinates = attributeValueCoordinates;
}
var attribute = new HtmlAttribute(attributeName, attributeNameInLowercase, attributeValue,
HtmlAttributeType.Unknown, attributeNameCoordinates, attributeValueCoordinates);
_tempAttributes.Add(attribute);
_innerContext.IncreasePosition(match.Length);
match = _attributeRegex.Match(content, _innerContext.Position, _innerContext.RemainderLength);
}
int attributeCount = _tempAttributes.Count;
var attributes = new List <HtmlAttribute>(attributeCount);
for (int attributeIndex = 0; attributeIndex < attributeCount; attributeIndex++)
{
attributes.Add(_tempAttributes[attributeIndex]);
}
_tempAttributes.Clear();
return(attributes);
}
