public static void AddOtherReplaces(HTMLParser htmlParser, string pageURL, List <ReplaceInfo> replaceList)
{
HashSet <int> existingOffsets = new HashSet <int>();
foreach (ReplaceInfo replace in replaceList)
{
existingOffsets.Add(replace.Offset);
}
if (Environment.NewLine != "\n")
{
int offset = 0;
while ((offset = htmlParser.PreprocessedHTML.IndexOf('\n', offset)) != -1)
{
replaceList.Add(new ReplaceInfo {
Offset = offset,
Length = 1,
Type = ReplaceType.Other,
Value = Environment.NewLine
});
offset += 1;
}
}
foreach (HTMLTag tag in htmlParser.FindStartTags("base"))
{
replaceList.Add(
new ReplaceInfo {
Offset = tag.Offset,
Length = tag.Length,
Type = ReplaceType.Other,
Value = String.Empty
});
}
foreach (HTMLTag tag in htmlParser.FindStartTags("a", "img", "script", "link"))
{
bool isATag = tag.NameEquals("a");
bool isImgTag = tag.NameEquals("img");
bool isScriptTag = tag.NameEquals("script");
bool isLinkTag = tag.NameEquals("link");
bool usesHRefAttr = isATag || isLinkTag;
bool usesSrcAttr = isImgTag || isScriptTag;
if (usesHRefAttr || usesSrcAttr)
{
HTMLAttribute attribute = tag.GetAttribute(usesHRefAttr ? "href" : usesSrcAttr ? "src" : null);
if (attribute != null && !existingOffsets.Contains(attribute.Offset))
{
// Make attribute's URL absolute
string newURL = GetAbsoluteURL(pageURL, HttpUtility.HtmlDecode(attribute.Value));
// For links to anchors on the current page, use just the fragment
if (isATag && newURL != null && newURL.Length > pageURL.Length &&
newURL.StartsWith(pageURL, StringComparison.Ordinal) && newURL[pageURL.Length] == '#')
{
newURL = newURL.Substring(pageURL.Length);
}
if (newURL != null)
{
replaceList.Add(
new ReplaceInfo {
Offset = attribute.Offset,
Length = attribute.Length,
Type = ReplaceType.Other,
Value = attribute.Name + "=\"" + HttpUtility.HtmlAttributeEncode(newURL) + "\""
});
}
}
}
}
}
private static IEnumerable <HTMLTag> ParseTags(string html, int htmlStart, int htmlEnd)
{
while (htmlStart < htmlEnd)
{
int pos = IndexOf(html, htmlStart, htmlEnd, '<');
if (pos == -1)
{
yield break;
}
HTMLTag tag = new HTMLTag();
tag.Offset = pos;
htmlStart = pos + 1;
tag.IsEnd = StartsWith(html, htmlStart, htmlEnd, '/');
if (StartsWithLetter(html, tag.IsEnd ? (htmlStart + 1) : htmlStart, htmlEnd))
{
// Parse tag name
if (tag.IsEnd)
{
htmlStart += 1;
}
pos = IndexOfAny(html, htmlStart, htmlEnd, true, '/', '>');
if (pos == -1)
{
yield break;
}
tag.Name = GetSectionLower(html, htmlStart, pos);
htmlStart = pos;
// Parse attributes
bool isTagComplete = false;
do
{
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd))
{
htmlStart++;
}
tag.IsSelfClosing = StartsWith(html, htmlStart, htmlEnd, '/');
if (tag.IsSelfClosing)
{
htmlStart += 1;
}
if (StartsWith(html, htmlStart, htmlEnd, '>'))
{
htmlStart += 1;
isTagComplete = true;
}
else if (tag.IsSelfClosing)
{
}
else
{
HTMLAttribute attribute = new HTMLAttribute();
attribute.Offset = htmlStart;
// Parse attribute name
pos = IndexOfAny(html, htmlStart + 1, htmlEnd, true, '=', '/', '>');
if (pos == -1)
{
yield break;
}
attribute.Name = GetSectionLower(html, htmlStart, pos);
htmlStart = pos;
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd))
{
htmlStart++;
}
if (StartsWith(html, htmlStart, htmlEnd, '='))
{
// Parse attribute value
htmlStart += 1;
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd))
{
htmlStart++;
}
if (StartsWithAny(html, htmlStart, htmlEnd, '"', '\''))
{
char quoteChar = html[htmlStart];
htmlStart += 1;
pos = IndexOf(html, htmlStart, htmlEnd, quoteChar);
if (pos == -1)
{
yield break;
}
attribute.Value = GetSection(html, htmlStart, pos);
htmlStart = pos + 1;
}
else
{
pos = IndexOfAny(html, htmlStart, htmlEnd, true, '>');
if (pos == -1)
{
yield break;
}
attribute.Value = GetSection(html, htmlStart, pos);
htmlStart = pos;
}
}
else
{
attribute.Value = String.Empty;
}
attribute.Length = htmlStart - attribute.Offset;
if (tag.GetAttribute(attribute.Name) == null)
{
tag.Attributes.Add(attribute);
}
}
} while (!isTagComplete);
tag.Length = htmlStart - tag.Offset;
// Yield result
yield return(tag);
// Skip contents of special tags whose contents are to be treated as raw text
if (!tag.IsEnd && !tag.IsSelfClosing && tag.NameEqualsAny("script", "style", "title", "textarea"))
{
bool foundEndTag = false;
do
{
pos = IndexOf(html, htmlStart, htmlEnd, '<');
if (pos == -1)
{
yield break;
}
htmlStart = pos + 1;
string endTagText = "/" + tag.Name;
if (StartsWith(html, htmlStart, htmlEnd, endTagText, true) &&
(StartsWithWhiteSpace(html, htmlStart + endTagText.Length, htmlEnd) ||
StartsWithAny(html, htmlStart + endTagText.Length, htmlEnd, '/', '>')))
{
htmlStart -= 1;
foundEndTag = true;
}
} while (!foundEndTag);
}
}
else if (StartsWith(html, htmlStart, htmlEnd, "!--", false) && !StartsWith(html, htmlStart + 3, htmlEnd, '>'))
{
// Skip comment
htmlStart += 3;
bool foundEnd = false;
do
{
pos = IndexOf(html, htmlStart, htmlEnd, '-');
if (pos == -1)
{
yield break;
}
htmlStart = pos + 1;
if (StartsWith(html, htmlStart, htmlEnd, "->", false))
{
htmlStart += 2;
foundEnd = true;
}
else if (StartsWith(html, htmlStart, htmlEnd, "-!>", false))
{
htmlStart += 3;
foundEnd = true;
}
} while (!foundEnd);
}
else if (StartsWithAny(html, htmlStart, htmlEnd, '?', '/', '!'))
{
// Skip bogus comment or DOCTYPE
htmlStart += 1;
pos = IndexOf(html, htmlStart, htmlEnd, '>');
if (pos == -1)
{
yield break;
}
htmlStart = pos + 1;
}
}
}
public string GetAttributeValue(string attributeName)
{
HTMLAttribute attribute = GetAttribute(attributeName);
return(attribute != null ? attribute.Value : null);
}
private static IEnumerable<HTMLTag> ParseTags(string html, int htmlStart, int htmlEnd)
{
while (htmlStart < htmlEnd) {
int pos = IndexOf(html, htmlStart, htmlEnd, '<');
if (pos == -1) yield break;
HTMLTag tag = new HTMLTag();
tag.Offset = pos;
htmlStart = pos + 1;
tag.IsEnd = StartsWith(html, htmlStart, htmlEnd, '/');
if (StartsWithLetter(html, tag.IsEnd ? (htmlStart + 1) : htmlStart, htmlEnd)) {
// Parse tag name
if (tag.IsEnd) htmlStart += 1;
pos = IndexOfAny(html, htmlStart, htmlEnd, true, '/', '>');
if (pos == -1) yield break;
tag.Name = GetSectionLower(html, htmlStart, pos);
htmlStart = pos;
// Parse attributes
bool isTagComplete = false;
do {
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd)) htmlStart++;
tag.IsSelfClosing = StartsWith(html, htmlStart, htmlEnd, '/');
if (tag.IsSelfClosing) htmlStart += 1;
if (StartsWith(html, htmlStart, htmlEnd, '>')) {
htmlStart += 1;
isTagComplete = true;
}
else if (tag.IsSelfClosing) { }
else {
HTMLAttribute attribute = new HTMLAttribute();
attribute.Offset = htmlStart;
// Parse attribute name
pos = IndexOfAny(html, htmlStart + 1, htmlEnd, true, '=', '/', '>');
if (pos == -1) yield break;
attribute.Name = GetSectionLower(html, htmlStart, pos);
htmlStart = pos;
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd)) htmlStart++;
if (StartsWith(html, htmlStart, htmlEnd, '=')) {
// Parse attribute value
htmlStart += 1;
while (StartsWithWhiteSpace(html, htmlStart, htmlEnd)) htmlStart++;
if (StartsWithAny(html, htmlStart, htmlEnd, '"', '\'')) {
char quoteChar = html[htmlStart];
htmlStart += 1;
pos = IndexOf(html, htmlStart, htmlEnd, quoteChar);
if (pos == -1) yield break;
attribute.Value = GetSection(html, htmlStart, pos);
htmlStart = pos + 1;
}
else {
pos = IndexOfAny(html, htmlStart, htmlEnd, true, '>');
if (pos == -1) yield break;
attribute.Value = GetSection(html, htmlStart, pos);
htmlStart = pos;
}
}
else {
attribute.Value = String.Empty;
}
attribute.Length = htmlStart - attribute.Offset;
if (tag.GetAttribute(attribute.Name) == null) {
tag.Attributes.Add(attribute);
}
}
} while (!isTagComplete);
tag.Length = htmlStart - tag.Offset;
// Yield result
yield return tag;
// Skip contents of special tags whose contents are to be treated as raw text
if (!tag.IsEnd && !tag.IsSelfClosing && tag.NameEqualsAny("script", "style", "title", "textarea")) {
bool foundEndTag = false;
do {
pos = IndexOf(html, htmlStart, htmlEnd, '<');
if (pos == -1) yield break;
htmlStart = pos + 1;
string endTagText = "/" + tag.Name;
if (StartsWith(html, htmlStart, htmlEnd, endTagText, true) &&
(StartsWithWhiteSpace(html, htmlStart + endTagText.Length, htmlEnd) ||
StartsWithAny(html, htmlStart + endTagText.Length, htmlEnd, '/', '>')))
{
htmlStart -= 1;
foundEndTag = true;
}
} while (!foundEndTag);
}
}
else if (StartsWith(html, htmlStart, htmlEnd, "!--", false) && !StartsWith(html, htmlStart + 3, htmlEnd, '>')) {
// Skip comment
htmlStart += 3;
bool foundEnd = false;
do {
pos = IndexOf(html, htmlStart, htmlEnd, '-');
if (pos == -1) yield break;
htmlStart = pos + 1;
if (StartsWith(html, htmlStart, htmlEnd, "->", false)) {
htmlStart += 2;
foundEnd = true;
}
else if (StartsWith(html, htmlStart, htmlEnd, "-!>", false)) {
htmlStart += 3;
foundEnd = true;
}
} while (!foundEnd);
}
else if (StartsWithAny(html, htmlStart, htmlEnd, '?', '/', '!')) {
// Skip bogus comment or DOCTYPE
htmlStart += 1;
pos = IndexOf(html, htmlStart, htmlEnd, '>');
if (pos == -1) yield break;
htmlStart = pos + 1;
}
}
}