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HTMLParser.pas
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HTMLParser.pas
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unit HtmlParser;
interface
uses
ActiveX, Classes, SysUtils, Contnrs,
DomCore, Entities, HtmlTokenizer;
type
TInsertionMode = (
imInitial, //"initial"
imBeforeHtml, //"before html"
imBeforeHead, //"before head"
imInHead, //"in head"
imInHeadNoscript, //"in head no script"
imAfterHead, //"after head",
imInBody, //"in body",
imText, //"text",
imInTable, //"in table",
imInTableText, //"in table text",
imInCaption, //"in caption",
imInColumnGroup, //"in column group",
imInTableBody, //"in table body",
imInRow, //"in row",
imInCell, //"in cell",
imInSelect, //"in select",
imInSelectInTable, //"in select in table",
imInTemplate, //"in template",
imAfterBody, //"after body",
imInFrameset, //"in frameset",
imAfterFrameset, //"after frameset",
imAfterAfterBody, //"after after body",
imAfterAfterFrameset //"after after frameset"
);
{
Initially, the stack of open elements is empty.
The stack grows downwards; the topmost node on the stack is the first one added to the stack,
and the bottommost node of the stack is the most recently added node in the stack
(notwithstanding when the stack is manipulated in a random access fashion as part of the handling for misnested tags).
}
TElementStack = class(TList)
private
function GetItems(Index: Integer): TElement;
function GetIsEmpty: Boolean;
public
constructor Create;
function TopMost: TElement;
function BottomMost: TElement;
procedure Pop;
property Items[Index: Integer]: TElement read GetItems;
property IsEmpty: Boolean read GetIsEmpty;
end;
THtmlParser = class
private
FHtmlDocument: TDocument;
{ State }
FTokenizer: THtmlTokenizer;
procedure Log(const s: string);
private
FOpenElements: TElementStack; //stack of open elements. FOpenElements[0] is the oldest, FOpenElements[Count] is the newest
FActiveFormattingElements: TElementStack;
FInsertionMode: TInsertionMode;
FOriginalInsertionMode: TInsertionMode;
FHead: TElement; //Once a head element has been parsed (whether implicitly or explicitly) the head element pointer gets set to point to this node.
FForm: TElement; //The form element pointer points to the last form element that was opened and whose end tag has not yet been seen.
FScripting: Boolean;
FFramesetOK: Boolean;
procedure AddParseError(const s: UnicodeString); overload;
procedure AddParseError(const Token: THtmlToken; ErrorMessage: string=''); overload;
procedure ResetTheInsertionModeAppropriately;
procedure SetInsertionMode(const Mode: TInsertionMode); // used to handle mis-nested formatting element tags.
function CreateElementForToken(const Node: THtmlToken): TElement;
procedure InsertComment(const Token: THtmlToken; Parent: TNode=nil);
procedure InsertCharacter(const Token: THtmlToken; Parent: TNode=nil);
procedure InsertAnHtmlElement(const Token: THtmlToken; Parent: TNode=nil);
procedure AddMarkerToActiveFormattingElements;
procedure GenericParsingAlgorithm(const Token: THtmlToken; NextTokenizerState: TTokenizerState);
procedure GenericRCDATAElementParsingAlgorithm(const Token: THtmlToken; Parent: TNode);
procedure AddNotImplementedParseError(const InsertionModeHandlerName: string);
function TextIs(const Left: UnicodeString; const Right: array of UnicodeString): Boolean;
procedure ProcessNodeAccordingToInsertionMode(const Node: THtmlToken; AInsertionMode: TInsertionMode);
procedure DoInitialInsertionMode(Node: THtmlToken); //13.2.6.4.1 The "initial" insertion mode
procedure DoBeforeHtmlInsertionMode(Node: THtmlToken); //13.2.6.4.2 The "before html" insertion mode
procedure DoBeforeHeadInsertionMode(Node: THtmlToken); //13.2.6.4.3 The "before head" insertion mode
procedure DoInHeadInsertionMode(Node: THtmlToken); //13.2.6.4.4 The "in head" insertion mode
procedure DoInHeadNoscriptInsertionMode(Node: THtmlToken); //13.2.6.4.5 The "in head noscript" insertion mode
procedure DoAfterHeadInsertionMode(Node: THtmlToken); //13.2.6.4.6 The "after head" insertion mode
procedure DoInBodyInsertionMode(Node: THtmlToken); //13.2.6.4.7 The "in body" insertion mode
procedure DoTextInsertionMode(Node: THtmlToken); //13.2.6.4.8 The "text" insertion mode
procedure DoInTableInsertionMode(Node: THtmlToken); //13.2.6.4.9 The "in table" insertion mode
procedure DoInTableTextInsertionMode(Node: THtmlToken); //13.2.6.4.10 The "in table text" insertion mode
procedure DoInCaptionInsertionMode(Node: THtmlToken); //13.2.6.4.11 The "in caption" insertion mode
procedure DoInColumnGroupInsertionMode(Node: THtmlToken); //13.2.6.4.12 The "in column group" insertion mode
procedure DoInTableBodyInsertionMode(Node: THtmlToken); //13.2.6.4.13 The "in table body" insertion mode
procedure DoInRowInsertionMode(Node: THtmlToken); //13.2.6.4.14 The "in row" insertion mode
procedure DoInCellInsertionMode(Node: THtmlToken); //13.2.6.4.15 The "in cell" insertion mode
procedure DoInSelectInsertionMode(Node: THtmlToken); //13.2.6.4.16 The "in select" insertion mode
procedure DoInSelectInTableInsertionMode(Node: THtmlToken); //13.2.6.4.17 The "in select in table" insertion mode
procedure DoInTemplateInsertionMode(Node: THtmlToken); //13.2.6.4.18 The "in template" insertion mode
procedure DoAfterBodyInsertionMode(Node: THtmlToken); //13.2.6.4.19 The "after body" insertion mode
procedure DoInFramesetInsertionMode(Node: THtmlToken); //13.2.6.4.20 The "in frameset" insertion mode
procedure DoAfterFramesetInsertionMode(Node: THtmlToken); //13.2.6.4.21 The "after frameset" insertion mode
procedure DoAfterAfterBodyInsertionMode(Node: THtmlToken); //13.2.6.4.22 The "after after body" insertion mode
procedure DoAfterAfterFrameseInsertionMode(Node: THtmlToken); //13.2.6.4.23 The "after after frameset" insertion mode
protected
function ParseString(const htmlStr: TDomString): TDocument;
procedure ProcessToken(Sender: TObject; AToken: THtmlToken);
property Document: TDocument read FHtmlDocument;
public
constructor Create;
destructor Destroy; override;
class function Parse(const HtmlStr: TDomString): TDocument;
property Scripting: Boolean read FScripting write FScripting;
property FramesetOK: Boolean read FFramesetOK;
end;
implementation
uses
Windows, TypInfo, ComObj,
HtmlParserTests,
HtmlTags;
{ THtmlParser }
constructor THtmlParser.Create;
begin
inherited Create;
FInsertionMode := imInitial; //Initially, the insertion mode is "initial".
FOriginalInsertionMode := imInitial;
FActiveFormattingElements := TElementStack.Create;
FOpenElements := TElementStack.Create;
FScripting := False;
FHead := nil;
FForm := nil;
end;
procedure THtmlParser.AddParseError(const s: UnicodeString);
begin
Log('Parse-Error: '+s);
end;
procedure THtmlParser.AddParseError(const Token: THtmlToken; ErrorMessage: string='');
var
s: string;
begin
{
The error you're having is that this Token type is not allowed in the current insertion mode
}
if ErrorMessage = '' then
ErrorMessage := 'Token not allowed in insertion mode %s';
s := '';
if Token <> nil then
s := Token.ClassName;
AddParseError(s+' '+ErrorMessage);
end;
procedure THtmlParser.AddNotImplementedParseError(const InsertionModeHandlerName: string);
begin
AddParseError('not-implemented-'+InsertionModeHandlerName);
raise ENotImplemented.Create(InsertionModeHandlerName);
end;
procedure THtmlParser.Log(const s: string);
begin
OutputDebugString(PChar(s));
end;
class function THtmlParser.Parse(const HtmlStr: TDomString): TDocument;
var
parser: THtmlParser;
begin
parser := THtmlParser.Create;
try
parser.Scripting := False;
Result := parser.ParseString(HtmlStr);
finally
parser.Free;
end;
end;
function THtmlParser.ParseString(const htmlStr: TDomString): TDocument;
begin
FTokenizer := THtmlTokenizer.Create(HtmlStr);
FTokenizer.OnToken := ProcessToken;
if FHtmlDocument <> nil then
FreeAndNil(FHtmlDocument);
FHtmlDocument := TDocument.Create;
FTokenizer.Parse;
Result := FHtmlDocument;
end;
procedure THtmlParser.ProcessToken(Sender: TObject; AToken: THtmlToken);
begin
if AToken = nil then
raise EArgumentNilException.Create('AToken');
Log(' ==> Emitted token '+AToken.Description);
ProcessNodeAccordingToInsertionMode(AToken, FInsertionMode);
end;
procedure THtmlParser.ProcessNodeAccordingToInsertionMode(const Node: THtmlToken; AInsertionMode: TInsertionMode);
begin
case AInsertionMode of
imInitial: DoInitialInsertionMode(Node); //"initial"
imBeforeHtml: DoBeforeHtmlInsertionMode(Node); //"before html"
imBeforeHead: DoBeforeHeadInsertionMode(Node); //"before head"
imInHead: DoInHeadInsertionMode(Node); //"in head"
imInHeadNoscript: DoInHeadNoscriptInsertionMode(Node); //"in head no script"
imAfterHead: DoAfterHeadInsertionMode(Node); //"after head",
imInBody: DoInBodyInsertionMode(Node); //"in body",
imText: DoTextInsertionMode(Node); //"text",
imInTable: DoInTableInsertionMode(Node); //"in table",
imInTableText: DoInTableTextInsertionMode(Node); //"in table text",
imInCaption: DoInCaptionInsertionMode(Node); //"in caption",
imInColumnGroup: DoInColumnGroupInsertionMode(Node); //"in column group",
imInTableBody: DoInTableBodyInsertionMode(Node); //"in table body",
imInRow: DoInRowInsertionMode(Node); //"in row",
imInCell: DoInCellInsertionMode(Node); //"in cell",
imInSelect: DoInSelectInsertionMode(Node); //"in select",
imInSelectInTable: DoInSelectInTableInsertionMode(Node); //"in select in table",
imInTemplate: DoInTemplateInsertionMode(Node); //"in template",
imAfterBody: DoAfterBodyInsertionMode(Node); //"after body",
imInFrameset: DoInFramesetInsertionMode(Node); //"in frameset",
imAfterFrameset: DoAfterFramesetInsertionMode(Node); //"after frameset",
imAfterAfterBody: DoAfterAfterBodyInsertionMode(Node); //"after after body",
imAfterAfterFrameset: DoAfterAfterFrameseInsertionMode(Node); //"after after frameset"
else
raise Exception.Create('Unknown insertion mode');
end;
end;
procedure THtmlParser.SetInsertionMode(const Mode: TInsertionMode);
begin
{
The insertion mode is a state variable that controls the primary operation of the tree construction stage.
Initially, the insertion mode is "initial". It can change to
- "before html"
- "before head"
- "in head"
- "in head noscript"
- "after head"
- "in body"
- "text"
- "in table"
- "in table text"
- "in caption"
- "in column group"
- "in table body"
- "in row"
- "in cell"
- "in select"
- "in select in table"
- "in template"
- "after body",
- "in frameset",
- "after frameset",
- "after after body",
- "after after frameset"
during the course of the parsing, as described in the tree construction stage.
The insertion mode affects how tokens are processed and whether CDATA sections are supported.
Several of these modes, namely "in head", "in body", "in table", and "in select", are special,
in that the other modes defer to them at various times.
When the algorithm below says that the user agent is to do something
"using the rules for the m insertion mode", where m is one of these modes,
the user agent must use the rules described under the m insertion mode's section,
but must leave the insertion mode unchanged unless the rules in m themselves
switch the insertion mode to a new value.
}
FInsertionMode := Mode;
end;
//*** Insertion Mode Handlers ***
procedure THtmlParser.DoInitialInsertionMode(Node: THtmlToken);
var
dt: TDocTypeToken;
doctype: TDocumentType;
begin
//13.2.6.4.1 The "initial" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#the-initial-insertion-mode
//A Document object has an associated parser cannot change the mode flag (a boolean).
//It is initially false.
//A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
if (node is TCharacterToken) and TextIs((node as TCharacterToken).Data, [#$0009, #$000A, #$000C, #$000D, #$0020]) then
begin
//ignore the token
end
else if (node is TCommentToken) then
begin
//Insert a comment as the last child of the Document object.
InsertComment(node, Document);
end
else if (node is TDocTypeToken) then
begin
dt := Node as TDocTypeToken;
if (not SameText(dt.Name, 'html')) then
AddParseError('DOCTYPE name is not "html"')
else if (not dt.PublicIdentifierMissing) then
AddParseError('DOCTYPE public identifier is not missing')
else if (not dt.SystemIdentifierMissing) then
begin
if not SameText(dt.SystemIdentifier, 'about:legacy-compat') then
AddParseError('DOCTYPE system identifier is not missing or "about:legacy-compat"');
end;
{ Append a DocumentType node to the Document node,
with its name set to the name given in the DOCTYPE token,
or the empty string if the name was missing;
its public ID set to the public identifier given in the DOCTYPE token,
or the empty string if the public identifier was missing;
and its system ID set to the system identifier given in the DOCTYPE token,
or the empty string if the system identifier was missing.
}
docType := DomImplementation.createDocumentType(dt.Name, dt.PublicIdentifier, dt.SystemIdentifier);
Document.AppendChild(docType);
{
TODO:
Then, if the document is not an iframe srcdoc document, and the parser cannot change the mode flag is false, and the DOCTYPE token matches one of the conditions in the following list, then set the Document to quirks mode:
The force-quirks flag is set to on.
The name is not "html".
The public identifier is set to: "-//W3O//DTD W3 HTML Strict 3.0//EN//"
The public identifier is set to: "-/W3C/DTD HTML 4.0 Transitional/EN"
The public identifier is set to: "HTML"
The system identifier is set to: "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"
The public identifier starts with: "+//Silmaril//dtd html Pro v0r11 19970101//"
The public identifier starts with: "-//AS//DTD HTML 3.0 asWedit + extensions//"
The public identifier starts with: "-//AdvaSoft Ltd//DTD HTML 3.0 asWedit + extensions//"
The public identifier starts with: "-//IETF//DTD HTML 2.0 Level 1//"
The public identifier starts with: "-//IETF//DTD HTML 2.0 Level 2//"
The public identifier starts with: "-//IETF//DTD HTML 2.0 Strict Level 1//"
The public identifier starts with: "-//IETF//DTD HTML 2.0 Strict Level 2//"
The public identifier starts with: "-//IETF//DTD HTML 2.0 Strict//"
The public identifier starts with: "-//IETF//DTD HTML 2.0//"
The public identifier starts with: "-//IETF//DTD HTML 2.1E//"
The public identifier starts with: "-//IETF//DTD HTML 3.0//"
The public identifier starts with: "-//IETF//DTD HTML 3.2 Final//"
The public identifier starts with: "-//IETF//DTD HTML 3.2//"
The public identifier starts with: "-//IETF//DTD HTML 3//"
The public identifier starts with: "-//IETF//DTD HTML Level 0//"
The public identifier starts with: "-//IETF//DTD HTML Level 1//"
The public identifier starts with: "-//IETF//DTD HTML Level 2//"
The public identifier starts with: "-//IETF//DTD HTML Level 3//"
The public identifier starts with: "-//IETF//DTD HTML Strict Level 0//"
The public identifier starts with: "-//IETF//DTD HTML Strict Level 1//"
The public identifier starts with: "-//IETF//DTD HTML Strict Level 2//"
The public identifier starts with: "-//IETF//DTD HTML Strict Level 3//"
The public identifier starts with: "-//IETF//DTD HTML Strict//"
The public identifier starts with: "-//IETF//DTD HTML//"
The public identifier starts with: "-//Metrius//DTD Metrius Presentational//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 2.0 HTML Strict//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 2.0 HTML//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 2.0 Tables//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 3.0 HTML Strict//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 3.0 HTML//"
The public identifier starts with: "-//Microsoft//DTD Internet Explorer 3.0 Tables//"
The public identifier starts with: "-//Netscape Comm. Corp.//DTD HTML//"
The public identifier starts with: "-//Netscape Comm. Corp.//DTD Strict HTML//"
The public identifier starts with: "-//O'Reilly and Associates//DTD HTML 2.0//"
The public identifier starts with: "-//O'Reilly and Associates//DTD HTML Extended 1.0//"
The public identifier starts with: "-//O'Reilly and Associates//DTD HTML Extended Relaxed 1.0//"
The public identifier starts with: "-//SQ//DTD HTML 2.0 HoTMetaL + extensions//"
The public identifier starts with: "-//SoftQuad Software//DTD HoTMetaL PRO 6.0::19990601::extensions to HTML 4.0//"
The public identifier starts with: "-//SoftQuad//DTD HoTMetaL PRO 4.0::19971010::extensions to HTML 4.0//"
The public identifier starts with: "-//Spyglass//DTD HTML 2.0 Extended//"
The public identifier starts with: "-//Sun Microsystems Corp.//DTD HotJava HTML//"
The public identifier starts with: "-//Sun Microsystems Corp.//DTD HotJava Strict HTML//"
The public identifier starts with: "-//W3C//DTD HTML 3 1995-03-24//"
The public identifier starts with: "-//W3C//DTD HTML 3.2 Draft//"
The public identifier starts with: "-//W3C//DTD HTML 3.2 Final//"
The public identifier starts with: "-//W3C//DTD HTML 3.2//"
The public identifier starts with: "-//W3C//DTD HTML 3.2S Draft//"
The public identifier starts with: "-//W3C//DTD HTML 4.0 Frameset//"
The public identifier starts with: "-//W3C//DTD HTML 4.0 Transitional//"
The public identifier starts with: "-//W3C//DTD HTML Experimental 19960712//"
The public identifier starts with: "-//W3C//DTD HTML Experimental 970421//"
The public identifier starts with: "-//W3C//DTD W3 HTML//"
The public identifier starts with: "-//W3O//DTD W3 HTML 3.0//"
The public identifier starts with: "-//WebTechs//DTD Mozilla HTML 2.0//"
The public identifier starts with: "-//WebTechs//DTD Mozilla HTML//"
The system identifier is missing and the public identifier starts with: "-//W3C//DTD HTML 4.01 Frameset//"
The system identifier is missing and the public identifier starts with: "-//W3C//DTD HTML 4.01 Transitional//"
Otherwise, if the document is not an iframe srcdoc document, and the parser cannot change the mode flag is false, and the DOCTYPE token matches one of the conditions in the following list, then then set the Document to limited-quirks mode:
The public identifier starts with: "-//W3C//DTD XHTML 1.0 Frameset//"
The public identifier starts with: "-//W3C//DTD XHTML 1.0 Transitional//"
The system identifier is not missing and the public identifier starts with: "-//W3C//DTD HTML 4.01 Frameset//"
The system identifier is not missing and the public identifier starts with: "-//W3C//DTD HTML 4.01 Transitional//"
The system identifier and public identifier strings must be compared to the values given in the lists above in an ASCII case-insensitive manner. A system identifier whose value is the empty string is not considered missing for the purposes of the conditions above.
}
SetInsertionMode(imBeforeHtml);
end
else
begin
{
TODO: If the document is not [an iframe srcdoc] document,
then this is a parse error;
if the [parser cannot change the mode flag] is false,
set the Document to [quirks mode].
}
SetInsertionMode(imBeforeHtml); //In any case, switch the insertion mode to "before html",
ProcessNodeAccordingToInsertionMode(node, FInsertionMode); //then reprocess the token.
end;
end;
procedure THtmlParser.DoBeforeHtmlInsertionMode(Node: THtmlToken);
var
element: TElement;
begin
//13.2.6.4.2 The "before html" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#the-before-html-insertion-mode
if Node is TDocTypeToken then
begin
AddParseError('doctype node in BeforeHtml insertion mode');
end
else if Node is TCommentToken then
begin
//Insert a comment as the last child of the Document object.
InsertComment(Node, Document);
end
else if (Node is TCharacterToken) and TextIs((Node as TCharacterToken).Data, [#$0009, #$000A, #$000C, #$000D, #$0020]) then
begin
//Ignore the token
end
else if (Node is TStartTagToken) and ((Node as TStartTagToken).TagName = 'html') then
begin
element := CreateElementForToken(Node);
Document.AppendChild(element);
FOpenElements.Add(element);
SetInsertionMode(imBeforeHead);
end;
end;
procedure THtmlParser.DoBeforeHeadInsertionMode(Node: THtmlToken);
begin
//13.2.6.4.3 The "before head" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#the-before-head-insertion-mode
AddNotImplementedParseError('DoBeforeHeadInsertionMode');
{
When the user agent is to apply the rules for the "before head" insertion mode, the user agent must handle the token as follows:
A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
Ignore the token.
A comment token
Insert a comment.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion mode.
A start tag whose tag name is "head"
Insert an HTML element for the token.
Set the head element pointer to the newly created head element.
Switch the insertion mode to "in head".
An end tag whose tag name is one of: "head", "body", "html", "br"
Act as described in the "anything else" entry below.
Any other end tag
Parse error. Ignore the token.
Anything else
Insert an HTML element for a "head" start tag token with no attributes.
Set the head element pointer to the newly created head element.
Switch the insertion mode to "in head".
Reprocess the current token.
}
end;
procedure THtmlParser.DoInHeadInsertionMode(Node: THtmlToken);
function IsStartTag(const List: array of UnicodeString): Boolean;
begin
if not (Node is TStartTagToken) then
begin
Result := False;
Exit;
end;
if Length(List) = 0 then
begin
Result := True;
Exit;
end;
Result := TextIs((Node as TStartTagToken).TagName, List);
end;
function IsEndTag(const List: array of UnicodeString): Boolean;
begin
if not (Node is TEndTagToken) then
begin
Result := False;
Exit;
end;
if Length(List) = 0 then
begin
Result := True;
Exit;
end;
Result := TextIs((Node as TEndTagToken).TagName, List);
end;
procedure AnythingElse;
begin
FOpenElements.Pop; //Pop the current node (which will be the head element) off the stack of open elements.
SetInsertionMode(imAfterHead); // Switch the insertion mode to "after head".
ProcessNodeAccordingToInsertionMode(node, FInsertionMode); //Reprocess the token.
end;
procedure InsertScriptElement;
begin
{
Run these steps:
Let the adjusted insertion location be the appropriate place for inserting a node.
Create an element for the token in the HTML namespace, with the intended parent being the element in which the adjusted insertion location finds itself.
Set the element's parser document to the Document, and unset the element's "non-blocking" flag.
This ensures that, if the script is external, any document.write() calls in the script will execute in-line, instead of blowing the document away, as would happen in most other cases. It also prevents the script from executing until the end tag is seen.
If the parser was created as part of the HTML fragment parsing algorithm, then mark the script element as "already started". (fragment case)
If the parser was invoked via the document.write() or document.writeln() methods, then optionally mark the script element as "already started". (For example, the user agent might use this clause to prevent execution of cross-origin scripts inserted via document.write() under slow network conditions, or when the page has already taken a long time to load.)
Insert the newly created element at the adjusted insertion location.
Push the element onto the stack of open elements so that it is the new current node.
Switch the tokenizer to the script data state.
Let the original insertion mode be the current insertion mode.
Switch the insertion mode to "text".
}
raise ENotImplemented.Create('InsertScriptElemetn');
end;
function st: TStartTagToken;
begin
Result := (node as TStartTagToken);
end;
begin
//13.2.6.4.4 The "in head" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inhead
AddNotImplementedParseError('DoInHeadInsertionMode');
if (node is TCharacterToken) and TextIs((node as TCharacterToken).Data, [#$0009, #$000A, #$000C, #$000D, #$0020]) then
begin
//A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
InsertCharacter(Node); //Insert the character.
end
else if node is TCommentToken then
begin
InsertComment(Node, nil); //Insert a comment.
end
else if node is TDocTypeToken then
begin
AddParseError(Node); //Parse error.
//Ignore the token.
end
else if IsStartTag(['html']) then
begin
//A start tag whose tag name is "html"
//Process the token using the rules for the "in body" insertion mode.
ProcessNodeAccordingToInsertionMode(node, imInBody);
end
else if IsStartTag(['base', 'basefont', 'bgsound', 'link']) then
begin
//A start tag whose tag name is one of: "base", "basefont", "bgsound", "link"
//Insert an HTML element for the token.
InsertAnHtmlElement(node);
//Immediately pop the current node off the stack of open elements.
FOpenElements.Pop;
//Acknowledge the token's self-closing flag, if it is set.
if (node as TStartTagToken).SelfClosing then
(node as TStartTagToken).AcknowledgeSelfClosing;
end
else if IsStartTag(['meta']) then
begin
//A start tag whose tag name is "meta"
InsertAnHtmlElement(node); //Insert an HTML element for the token
FOpenElements.Pop; //Immediately pop the current node off the stack of open elements.
if st.SelfClosing then
st.AcknowledgeSelfClosing; // Acknowledge the token's self-closing flag, if it is set.
//TODO: If the active speculative HTML parser is null, then:
{ if FActiveSpeculationHtmlParser = nil then
begin
//If the element has a charset attribute, and getting an encoding
//from its value results in an encoding, and the confidence is currently
//tentative,
then change the encoding to the resulting encoding.
else
Otherwise, if the element has an http-equiv attribute whose value is
an ASCII case-insensitive match for the string "Content-Type",
and the element has a content attribute, and applying the algorithm
for extracting a character encoding from a meta element to that
attribute's value returns an encoding, and the confidence is currently
tentative,
then change the encoding to the extracted encoding.
end;}
end
else if IsStartTag(['title']) then
begin
//A start tag whose tag name is "title"
GenericRCDATAElementParsingAlgorithm(node, nil); //Follow the generic RCDATA element parsing algorithm.
end
else if (Scripting and (isStartTag(['noscript'])))
or IsStartTag(['noframes', 'style']) then
begin
//A start tag whose tag name is "noscript", if the scripting flag is enabled
//A start tag whose tag name is one of: "noframes", "style"
GenericParsingAlgorithm(node, tsRawTextState); //Follow the generic raw text element parsing algorithm.
end
else if (not Scripting) and (st.TagName = 'noscript') then
begin
//A start tag whose tag name is "noscript", if the scripting flag is disabled
InsertAnHtmlElement(node); //Insert an HTML element for the token.
SetInsertionMode(imInHeadNoscript); //Switch the insertion mode to "in head noscript".
end
else if IsStartTag(['script']) then
begin
//A start tag whose tag name is "script"
InsertScriptElement;
end
else if IsEndTag(['head']) then
begin
//An end tag whose tag name is "head"
FOpenElements.Pop; // Pop the current node (which will be the head element) off the stack of open elements.
SetInsertionMode(imAfterHead); //Switch the insertion mode to "after head".
end
else if IsEndTag(['body', 'html', 'br']) then
begin
//An end tag whose tag name is one of: "body", "html", "br"
AnythingElse; //Act as described in the "anything else" entry below.
end
else if IsStartTag(['template']) then
begin
//A start tag whose tag name is "template"
InsertAnHtmlElement(node); // Insert an HTML element for the token.
AddMarkerToActiveFormattingElements; //Insert a marker at the end of the list of active formatting elements.
FFramesetOK := False; //Set the frameset-ok flag to "not ok".
SetInsertionMode(imInTemplate); // Switch the insertion mode to "in template".
//TODO: Push "in template" onto the stack of template insertion modes so that it is the new current template insertion mode.
end
else if IsEndTag(['template']) then
begin
//An end tag whose tag name is "template"
if (True {there is no template element on the stack of open elements}) then
begin
AddParseError(node); //this is a parse error;
Exit; //ignore the token.
end;
// TODO: Generate all implied end tags thoroughly.
If (True {the current node is not a template element}) then
begin
AddParseError(Node, 'Current node is not a template element'); //this is a parse error.
end;
//TODO: Pop elements from the stack of open elements until a template element has been popped from the stack.
//TODO: Clear the list of active formatting elements up to the last marker.
//TODO: Pop the current template insertion mode off the stack of template insertion modes.
ResetTheInsertionModeAppropriately; //Reset the insertion mode appropriately.
end
else if IsStartTag(['head']) or (Node is TEndTagToken) then
begin
//A start tag whose tag name is "head"
//Any other end tag
AddParseError(node);// Parse error.
Exit; //Ignore the token.
end
else
AnythingElse;
end;
procedure THtmlParser.DoInHeadNoscriptInsertionMode(Node: THtmlToken);
begin
//13.2.6.4.5 The "in head noscript" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inheadnoscript
AddNotImplementedParseError('DoInHeadNoscriptInsertionMode');
{
When the user agent is to apply the rules for the "in head noscript" insertion mode, the user agent must handle the token as follows:
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion mode.
An end tag whose tag name is "noscript"
Pop the current node (which will be a noscript element) from the stack of open elements; the new current node will be a head element.
Switch the insertion mode to "in head".
A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
A comment token
A start tag whose tag name is one of: "basefont", "bgsound", "link", "meta", "noframes", "style"
Process the token using the rules for the "in head" insertion mode.
An end tag whose tag name is "br"
Act as described in the "anything else" entry below.
A start tag whose tag name is one of: "head", "noscript"
Any other end tag
Parse error. Ignore the token.
Anything else
Parse error.
Pop the current node (which will be a noscript element) from the stack of open elements; the new current node will be a head element.
Switch the insertion mode to "in head".
Reprocess the token.
}
end;
procedure THtmlParser.DoAfterHeadInsertionMode(Node: THtmlToken);
begin
//13.2.6.4.6 The "after head" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#the-after-head-insertion-mode
AddNotImplementedParseError('DoAfterHeadInsertionMode');
{
When the user agent is to apply the rules for the "after head" insertion mode, the user agent must handle the token as follows:
A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
Insert the character.
A comment token
Insert a comment.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Process the token using the rules for the "in body" insertion mode.
A start tag whose tag name is "body"
Insert an HTML element for the token.
Set the Document's awaiting parser-inserted body flag to false.
Set the frameset-ok flag to "not ok".
Switch the insertion mode to "in body".
A start tag whose tag name is "frameset"
Insert an HTML element for the token.
Set the Document's awaiting parser-inserted body flag to false.
The awaiting parser-inserted body flag is exclusively used by render-blocking, for which the presence of either a frameset or a body element indicates that there is content to render, so we simply treat them as the same.
Switch the insertion mode to "in frameset".
A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", "meta", "noframes", "script", "style", "template", "title"
Parse error.
Push the node pointed to by the head element pointer onto the stack of open elements.
Process the token using the rules for the "in head" insertion mode.
Remove the node pointed to by the head element pointer from the stack of open elements. (It might not be the current node at this point.)
The head element pointer cannot be null at this point.
An end tag whose tag name is "template"
Process the token using the rules for the "in head" insertion mode.
An end tag whose tag name is one of: "body", "html", "br"
Act as described in the "anything else" entry below.
A start tag whose tag name is "head"
Any other end tag
Parse error. Ignore the token.
Anything else
Insert an HTML element for a "body" start tag token with no attributes.
Set the Document's awaiting parser-inserted body flag to false.
Switch the insertion mode to "in body".
Reprocess the current token.
}
end;
procedure THtmlParser.DoInBodyInsertionMode(Node: THtmlToken);
begin
//13.2.6.4.7 The "in body" insertion mode
//https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inbody
AddNotImplementedParseError('DoInBodyInsertionMode');
{
When the user agent is to apply the rules for the "in body" insertion mode, the user agent must handle the token as follows:
A character token that is U+0000 NULL
Parse error. Ignore the token.
A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF), U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
Reconstruct the active formatting elements, if any.
Insert the token's character.
Any other character token
Reconstruct the active formatting elements, if any.
Insert the token's character.
Set the frameset-ok flag to "not ok".
A comment token
Insert a comment.
A DOCTYPE token
Parse error. Ignore the token.
A start tag whose tag name is "html"
Parse error.
If there is a template element on the stack of open elements, then ignore the token.
Otherwise, for each attribute on the token, check to see if the attribute is already present on the top element of the stack of open elements. If it is not, add the attribute and its corresponding value to that element.
A start tag whose tag name is one of: "base", "basefont", "bgsound", "link", "meta", "noframes", "script", "style", "template", "title"
An end tag whose tag name is "template"
Process the token using the rules for the "in head" insertion mode.
A start tag whose tag name is "body"
Parse error.
If the second element on the stack of open elements is not a body element, if the stack of open elements has only one node on it, or if there is a template element on the stack of open elements, then ignore the token. (fragment case)
Otherwise, set the frameset-ok flag to "not ok"; then, for each attribute on the token, check to see if the attribute is already present on the body element (the second element) on the stack of open elements, and if it is not, add the attribute and its corresponding value to that element.
A start tag whose tag name is "frameset"
Parse error.
If the stack of open elements has only one node on it, or if the second element on the stack of open elements is not a body element, then ignore the token. (fragment case)
If the frameset-ok flag is set to "not ok", ignore the token.
Otherwise, run the following steps:
Remove the second element on the stack of open elements from its parent node, if it has one.
Pop all the nodes from the bottom of the stack of open elements, from the current node up to, but not including, the root html element.
Insert an HTML element for the token.
Switch the insertion mode to "in frameset".
An end-of-file token
If the stack of template insertion modes is not empty, then process the token using the rules for the "in template" insertion mode.
Otherwise, follow these steps:
If there is a node in the stack of open elements that is not either a dd element, a dt element, an li element, an optgroup element, an option element, a p element, an rb element, an rp element, an rt element, an rtc element, a tbody element, a td element, a tfoot element, a th element, a thead element, a tr element, the body element, or the html element, then this is a parse error.
Stop parsing.
An end tag whose tag name is "body"
If the stack of open elements does not have a body element in scope, this is a parse error; ignore the token.
Otherwise, if there is a node in the stack of open elements that is not either a dd element, a dt element, an li element, an optgroup element, an option element, a p element, an rb element, an rp element, an rt element, an rtc element, a tbody element, a td element, a tfoot element, a th element, a thead element, a tr element, the body element, or the html element, then this is a parse error.
Switch the insertion mode to "after body".
An end tag whose tag name is "html"
If the stack of open elements does not have a body element in scope, this is a parse error; ignore the token.
Otherwise, if there is a node in the stack of open elements that is not either a dd element, a dt element, an li element, an optgroup element, an option element, a p element, an rb element, an rp element, an rt element, an rtc element, a tbody element, a td element, a tfoot element, a th element, a thead element, a tr element, the body element, or the html element, then this is a parse error.
Switch the insertion mode to "after body".
Reprocess the token.
A start tag whose tag name is one of: "address", "article", "aside", "blockquote", "center", "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure", "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p", "section", "summary", "ul"
If the stack of open elements has a p element in button scope, then close a p element.
Insert an HTML element for the token.
A start tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6"
If the stack of open elements has a p element in button scope, then close a p element.
If the current node is an HTML element whose tag name is one of "h1", "h2", "h3", "h4", "h5", or "h6", then this is a parse error; pop the current node off the stack of open elements.
Insert an HTML element for the token.
A start tag whose tag name is one of: "pre", "listing"
If the stack of open elements has a p element in button scope, then close a p element.
Insert an HTML element for the token.
If the next token is a U+000A LINE FEED (LF) character token, then ignore that token and move on to the next one. (Newlines at the start of pre blocks are ignored as an authoring convenience.)
Set the frameset-ok flag to "not ok".
A start tag whose tag name is "form"
If the form element pointer is not null, and there is no template element on the stack of open elements, then this is a parse error; ignore the token.
Otherwise:
If the stack of open elements has a p element in button scope, then close a p element.
Insert an HTML element for the token, and, if there is no template element on the stack of open elements, set the form element pointer to point to the element created.
A start tag whose tag name is "li"
Run these steps:
Set the frameset-ok flag to "not ok".
Initialize node to be the current node (the bottommost node of the stack).
Loop: If node is an li element, then run these substeps:
Generate implied end tags, except for li elements.
If the current node is not an li element, then this is a parse error.
Pop elements from the stack of open elements until an li element has been popped from the stack.
Jump to the step labeled done below.
If node is in the special category, but is not an address, div, or p element, then jump to the step labeled done below.
Otherwise, set node to the previous entry in the stack of open elements and return to the step labeled loop.
Done: If the stack of open elements has a p element in button scope, then close a p element.
Finally, insert an HTML element for the token.
A start tag whose tag name is one of: "dd", "dt"
Run these steps:
Set the frameset-ok flag to "not ok".
Initialize node to be the current node (the bottommost node of the stack).
Loop: If node is a dd element, then run these substeps: