rickg cb2d8b8eb8 MUCH better support for auto-closing tags.
git-svn-id: svn://10.0.0.236/trunk@1363 18797224-902f-48f8-a5cc-f745e15eee43
1998-05-09 00:42:33 +00:00

910 lines
26 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/**
* MODULE NOTES:
* @update gess 4/8/98
*
*
*/
#include "CNavDTD.h"
#include "nsHTMLTokens.h"
#include "nsCRT.h"
#include "nsParserTypes.h"
#include "nsIParser.h"
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIDTDIID, NS_IDTD_IID);
static NS_DEFINE_IID(kClassIID, NS_INAVHTML_DTD_IID);
/**
* This method gets called as part of our COM-like interfaces.
* Its purpose is to create an interface to parser object
* of some type.
*
* @update gess 4/8/98
* @param nsIID id of object to discover
* @param aInstancePtr ptr to newly discovered interface
* @return NS_xxx result code
*/
nsresult CNavDTD::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if(aIID.Equals(kISupportsIID)) { //do IUnknown...
*aInstancePtr = (nsIDTD*)(this);
}
else if(aIID.Equals(kIDTDIID)) { //do IParser base class...
*aInstancePtr = (nsIDTD*)(this);
}
else if(aIID.Equals(kClassIID)) { //do this class...
*aInstancePtr = (CNavDTD*)(this);
}
else {
*aInstancePtr=0;
return NS_NOINTERFACE;
}
((nsISupports*) *aInstancePtr)->AddRef();
return NS_OK;
}
/**
* This method is defined in nsIParser. It is used to
* cause the COM-like construction of an nsHTMLParser.
*
* @update gess 4/8/98
* @param nsIParser** ptr to newly instantiated parser
* @return NS_xxx error result
*/
NS_HTMLPARS nsresult NS_NewNavHTMLDTD(nsIDTD** aInstancePtrResult)
{
CNavDTD* it = new CNavDTD();
if (it == 0) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kClassIID, (void **) aInstancePtrResult);
}
NS_IMPL_ADDREF(CNavDTD)
NS_IMPL_RELEASE(CNavDTD)
/**
* Default constructor
*
* @update gess 4/9/98
* @param
* @return
*/
CNavDTD::CNavDTD() : nsIDTD() {
mParser=0;
}
/**
* Default destructor
*
* @update gess 4/9/98
* @param
* @return
*/
CNavDTD::~CNavDTD(){
}
/**
*
*
* @update gess 3/25/98
* @param
* @return
*/
void CNavDTD::SetParser(nsIParser* aParser) {
mParser=aParser;
}
static char formElementTags[]= {
eHTMLTag_button, eHTMLTag_fieldset, eHTMLTag_input,
eHTMLTag_isindex, eHTMLTag_label, eHTMLTag_legend,
eHTMLTag_select, eHTMLTag_textarea,0};
static char gHeadingTags[]={
eHTMLTag_h1, eHTMLTag_h2, eHTMLTag_h3,
eHTMLTag_h4, eHTMLTag_h5, eHTMLTag_h6,
0};
/**
* This method is called to determine whether or not a tag
* of one type can contain a tag of another type.
*
* @update gess 4/8/98
* @param aParent -- tag enum of parent container
* @param aChild -- tag enum of child container
* @return PR_TRUE if parent can contain child
*/
PRBool CNavDTD::CanContainFormElement(PRInt32 aParent,PRInt32 aChild) const {
PRBool result=(mParser) ? mParser->HasOpenContainer(eHTMLTag_form) : PR_FALSE;
return result;
}
/**
* This method is called to determine whether or not a tag
* of one type can contain a tag of another type.
*
* @update gess 4/8/98
* @param aParent -- tag enum of parent container
* @param aChild -- tag enum of child container
* @return PR_TRUE if parent can contain child
*/
PRBool CNavDTD::CanContain(PRInt32 aParent,PRInt32 aChild) const {
PRBool result=PR_FALSE;
//tagset1 has 64 members...
static char gTagSet1[]={
eHTMLTag_a, eHTMLTag_acronym, eHTMLTag_address, eHTMLTag_applet,
eHTMLTag_bold, eHTMLTag_basefont, eHTMLTag_bdo, eHTMLTag_big,
eHTMLTag_blockquote,eHTMLTag_br, eHTMLTag_button, eHTMLTag_center,
eHTMLTag_cite, eHTMLTag_code, eHTMLTag_dfn, eHTMLTag_dir,
eHTMLTag_div, eHTMLTag_dl, eHTMLTag_em, eHTMLTag_fieldset,
eHTMLTag_font, eHTMLTag_form, eHTMLTag_h1, eHTMLTag_h2,
eHTMLTag_h3, eHTMLTag_h4, eHTMLTag_h5, eHTMLTag_h6,
eHTMLTag_hr, eHTMLTag_italic, eHTMLTag_iframe, eHTMLTag_img,
eHTMLTag_input, eHTMLTag_isindex,
eHTMLTag_kbd, eHTMLTag_label,
eHTMLTag_map, eHTMLTag_menu, eHTMLTag_newline, //JUST ADDED!
eHTMLTag_noframes, eHTMLTag_noscript,
eHTMLTag_object, eHTMLTag_ol, eHTMLTag_paragraph, eHTMLTag_pre,
eHTMLTag_quotation, eHTMLTag_strike, eHTMLTag_samp, eHTMLTag_script,
eHTMLTag_select, eHTMLTag_small, eHTMLTag_span, eHTMLTag_strong,
eHTMLTag_sub, eHTMLTag_sup, eHTMLTag_table, eHTMLTag_text,
eHTMLTag_textarea, eHTMLTag_tt, eHTMLTag_u, eHTMLTag_ul,
eHTMLTag_userdefined, eHTMLTag_var,
eHTMLTag_whitespace, //JUST ADDED!
0};
//tagset2 has 43 members...
static char gTagSet2[]={
eHTMLTag_a, eHTMLTag_acronym, eHTMLTag_applet, eHTMLTag_bold,
eHTMLTag_basefont, eHTMLTag_bdo, eHTMLTag_big, eHTMLTag_br,
eHTMLTag_button, eHTMLTag_cite, eHTMLTag_code, eHTMLTag_dfn,
eHTMLTag_em, eHTMLTag_font, eHTMLTag_hr, eHTMLTag_italic,
eHTMLTag_iframe, eHTMLTag_img, eHTMLTag_input, eHTMLTag_kbd,
eHTMLTag_label, eHTMLTag_map, eHTMLTag_newline, //JUST ADDED!
eHTMLTag_object, eHTMLTag_paragraph,
eHTMLTag_quotation, eHTMLTag_strike, eHTMLTag_samp, eHTMLTag_script,
eHTMLTag_select, eHTMLTag_small, eHTMLTag_span, eHTMLTag_strong,
eHTMLTag_sub, eHTMLTag_sup, eHTMLTag_text, eHTMLTag_textarea,
eHTMLTag_tt, eHTMLTag_u, eHTMLTag_userdefined, eHTMLTag_var,
eHTMLTag_whitespace,//JUST ADDED!
0};
//tagset3 has 57 members...
static char gTagSet3[]={
eHTMLTag_a, eHTMLTag_acronym, eHTMLTag_applet, eHTMLTag_bold,
eHTMLTag_bdo, eHTMLTag_big, eHTMLTag_br, eHTMLTag_blockquote,
eHTMLTag_body, eHTMLTag_caption, eHTMLTag_center, eHTMLTag_cite,
eHTMLTag_code, eHTMLTag_dd, eHTMLTag_del, eHTMLTag_dfn,
eHTMLTag_div, eHTMLTag_dt, eHTMLTag_em, eHTMLTag_fieldset,
eHTMLTag_font, eHTMLTag_form, eHTMLTag_h1, eHTMLTag_h2,
eHTMLTag_h3, eHTMLTag_h4, eHTMLTag_h5, eHTMLTag_h6,
eHTMLTag_italic, eHTMLTag_iframe, eHTMLTag_ins, eHTMLTag_kbd,
eHTMLTag_label, eHTMLTag_legend,
eHTMLTag_listitem, eHTMLTag_newline, //JUST ADDED!
eHTMLTag_noframes,
eHTMLTag_noscript, eHTMLTag_object, eHTMLTag_paragraph, eHTMLTag_pre,
eHTMLTag_quotation, eHTMLTag_strike, eHTMLTag_samp, eHTMLTag_small,
eHTMLTag_span, eHTMLTag_strong, eHTMLTag_sub, eHTMLTag_sup,
eHTMLTag_td, eHTMLTag_text,
eHTMLTag_th, eHTMLTag_tt, eHTMLTag_u, eHTMLTag_userdefined,
eHTMLTag_var, eHTMLTag_whitespace, //JUST ADDED!
0};
//This hack code is here because we don't yet know what to do
//with userdefined tags... XXX Hack
if(eHTMLTag_userdefined==aChild) // XXX Hack: For now...
result=PR_TRUE;
//handle form elements (this is very much a WIP!!!)
if(0!=strchr(formElementTags,aChild)){
return CanContainFormElement(aParent,aChild);
}
switch(aParent) {
case eHTMLTag_a:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_acronym:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_address:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_applet:
{
static char okTags[]={
eHTMLTag_a, eHTMLTag_acronym, eHTMLTag_applet, eHTMLTag_bold,
eHTMLTag_basefont,eHTMLTag_bdo, eHTMLTag_big, eHTMLTag_br,
eHTMLTag_button, eHTMLTag_cite, eHTMLTag_code, eHTMLTag_dfn,
eHTMLTag_em, eHTMLTag_font, eHTMLTag_italic, eHTMLTag_iframe,
eHTMLTag_img, eHTMLTag_input, eHTMLTag_kbd, eHTMLTag_label,
eHTMLTag_map, eHTMLTag_object, eHTMLTag_param, eHTMLTag_quotation,
eHTMLTag_samp, eHTMLTag_script, eHTMLTag_select, eHTMLTag_small,
eHTMLTag_span, eHTMLTag_strike, eHTMLTag_strong, eHTMLTag_sub,
eHTMLTag_sup, eHTMLTag_textarea, eHTMLTag_tt, eHTMLTag_u,
eHTMLTag_var,0};
result=PRBool(0!=strchr(okTags,aChild));
}
case eHTMLTag_area:
case eHTMLTag_base:
case eHTMLTag_basefont:
case eHTMLTag_br:
break; //singletons can't contain other tags
case eHTMLTag_bdo:
case eHTMLTag_big:
case eHTMLTag_blink:
case eHTMLTag_bold:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_blockquote:
case eHTMLTag_body:
if(eHTMLTag_userdefined==aChild)
result=PR_TRUE;
else result=PRBool(0!=strchr(gTagSet1,aChild));
break;
case eHTMLTag_button:
result=PRBool(0!=strchr(gTagSet3,aChild)); break;
case eHTMLTag_caption:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_center:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_cite: case eHTMLTag_code:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_col:
case eHTMLTag_colgroup:
break; //singletons can't contain anything...
case eHTMLTag_dd:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_del: case eHTMLTag_dfn:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_div:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_dl:
{
char okTags[]={eHTMLTag_dd,eHTMLTag_dt,0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
case eHTMLTag_dt:
break; //singletons can't contain anything...
case eHTMLTag_em:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_fieldset:
if(eHTMLTag_legend==aChild)
result=PR_TRUE;
else result=PRBool(0!=strchr(gTagSet1,aChild));
break;
case eHTMLTag_font:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_form:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_frame:
break; //singletons can't contain other tags
case eHTMLTag_frameset:
{
static char okTags[]={eHTMLTag_frame,eHTMLTag_frameset,eHTMLTag_noframes,0};
result=PRBool(0!=strchr(okTags,aChild));
}
case eHTMLTag_h1: case eHTMLTag_h2:
case eHTMLTag_h3: case eHTMLTag_h4:
case eHTMLTag_h5: case eHTMLTag_h6:
{
if(0!=strchr(gHeadingTags,aChild))
result=PR_FALSE;
else result=PRBool(0!=strchr(gTagSet1,aChild));
}
break;
case eHTMLTag_head:
{
static char okTags[]={
eHTMLTag_base, eHTMLTag_isindex, eHTMLTag_link, eHTMLTag_meta,
eHTMLTag_script,eHTMLTag_style, eHTMLTag_title, 0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
case eHTMLTag_hr:
break; //singletons can't contain anything...
case eHTMLTag_html:
{
static char okTags[]={eHTMLTag_body,eHTMLTag_frameset,eHTMLTag_head,0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
case eHTMLTag_iframe:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_img:
case eHTMLTag_input:
case eHTMLTag_isindex:
case eHTMLTag_spacer:
case eHTMLTag_wbr:
break; //singletons can't contain anything...
case eHTMLTag_italic:
case eHTMLTag_ins:
case eHTMLTag_kbd:
case eHTMLTag_label:
case eHTMLTag_legend:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_layer:
break;
case eHTMLTag_link:
break; //singletons can't contain anything...
case eHTMLTag_listitem:
if (eHTMLTag_listitem == aChild) {
return PR_FALSE;
}
result = PR_TRUE;
break;
case eHTMLTag_listing:
result = PR_TRUE; break;
case eHTMLTag_map:
result=PRBool(eHTMLTag_area==aChild); break;
case eHTMLTag_marquee:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_math:
break; //nothing but plain text...
case eHTMLTag_meta:
break; //singletons can't contain other tags
case eHTMLTag_menu:
case eHTMLTag_dir:
case eHTMLTag_ol:
case eHTMLTag_ul:
// XXX kipp was here
result = PR_TRUE;
break;
case eHTMLTag_noframes:
if(eHTMLTag_body==aChild)
result=PR_TRUE;
else result=PRBool(0!=strchr(gTagSet1,aChild));
break;
case eHTMLTag_noscript:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_note:
case eHTMLTag_object:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_option:
result=PR_TRUE; break; //for now, allow select to contain anything...
case eHTMLTag_paragraph:
if(eHTMLTag_paragraph==aChild)
result=PR_FALSE;
else result=PRBool(0!=strchr(gTagSet2,aChild));
break;
case eHTMLTag_param:
break; //singletons can't contain other tags
case eHTMLTag_plaintext:
break;
case eHTMLTag_pre:
case eHTMLTag_quotation:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_strike:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_script:
break; //unadorned script text...
case eHTMLTag_select:
result=PR_TRUE; break; //for now, allow select to contain anything...
case eHTMLTag_small:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_span:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_style:
break; //singletons can't contain other tags
case eHTMLTag_strong:
case eHTMLTag_samp:
case eHTMLTag_sub:
case eHTMLTag_sup:
result=PRBool(0!=strchr(gTagSet1,aChild)); break;
case eHTMLTag_table:
{
static char okTags[]={
eHTMLTag_caption, eHTMLTag_col, eHTMLTag_colgroup,eHTMLTag_tbody,
eHTMLTag_tfoot, eHTMLTag_tr, eHTMLTag_thead, 0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
case eHTMLTag_tbody:
case eHTMLTag_tfoot:
case eHTMLTag_thead:
result=PRBool(eHTMLTag_tr==aChild); break;
case eHTMLTag_th:
result=PRBool(0!=strchr(gTagSet1,aChild));
break;
case eHTMLTag_td:
{
static char extraTags[]={eHTMLTag_newline,0};
result=PRBool(0!=strchr(extraTags,aChild));
if(PR_FALSE==result)
result=PRBool(0!=strchr(gTagSet1,aChild));
}
break;
case eHTMLTag_textarea:
case eHTMLTag_title:
break; //nothing but plain text...
case eHTMLTag_tr:
{
static char okTags[]={eHTMLTag_td,eHTMLTag_th,0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
case eHTMLTag_tt:
case eHTMLTag_u:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_var:
result=PRBool(0!=strchr(gTagSet2,aChild)); break;
case eHTMLTag_userdefined:
result=PR_TRUE; break; //XXX for now...
case eHTMLTag_xmp:
default:
break;
} //switch
return result;
}
/**
* This method is called to determine whether or not a tag
* of one type can contain a tag of another type.
*
* @update gess 4/8/98
* @param aParent -- tag enum of parent container
* @param aChild -- tag enum of child container
* @return PR_TRUE if parent can contain child
*/
PRBool CNavDTD::CanContainIndirect(PRInt32 aParent,PRInt32 aChild) const {
PRBool result=PR_FALSE;
switch(aParent) {
case eHTMLTag_html:
{
static char okTags[]={
eHTMLTag_head, eHTMLTag_body,
eHTMLTag_header, eHTMLTag_footer,0
};
result=PRBool(0!=strchr(okTags,aChild));
}
case eHTMLTag_body:
result=PR_TRUE; break;
case eHTMLTag_table:
{
static char okTags[]={
eHTMLTag_caption, eHTMLTag_colgroup,
eHTMLTag_tbody, eHTMLTag_tfoot,
eHTMLTag_thead, eHTMLTag_tr,
eHTMLTag_td, eHTMLTag_th,
eHTMLTag_col, 0};
result=PRBool(0!=strchr(okTags,aChild));
}
break;
result=PR_TRUE; break;
default:
break;
}
return result;
}
/**
* This method gets called to determine whether a given
* tag can contain newlines. Most do not.
*
* @update gess 3/25/98
* @param aTag -- tag to test for containership
* @return PR_TRUE if given tag can contain other tags
*/
PRBool CNavDTD::CanOmit(PRInt32 aParent,PRInt32 aChild) const {
PRBool result=PR_FALSE;
//begin with some simple (and obvious) cases...
switch((eHTMLTags)aChild) {
case eHTMLTag_userdefined:
case eHTMLTag_comment:
result=PR_TRUE;
break;
case eHTMLTag_button: case eHTMLTag_fieldset:
case eHTMLTag_input: case eHTMLTag_isindex:
case eHTMLTag_label: case eHTMLTag_legend:
case eHTMLTag_select: case eHTMLTag_textarea:
if(PR_FALSE==mParser->HasOpenContainer(eHTMLTag_form))
result=PR_TRUE;
break;
case eHTMLTag_newline:
case eHTMLTag_whitespace:
switch((eHTMLTags)aParent) {
case eHTMLTag_html: case eHTMLTag_head:
case eHTMLTag_title: case eHTMLTag_map:
case eHTMLTag_tr: case eHTMLTag_table:
case eHTMLTag_thead: case eHTMLTag_tfoot:
case eHTMLTag_tbody: case eHTMLTag_col:
case eHTMLTag_colgroup: case eHTMLTag_unknown:
result=PR_TRUE;
default:
break;
} //switch
break;
default:
if(eHTMLTag_unknown==aParent)
result=PR_FALSE;
break;
} //switch
return result;
}
/**
* This method gets called to determine whether a given
* ENDtag can be omitted. Admittedly,this is a gross simplification.
*
* @update gess 3/25/98
* @param aTag -- tag to test for containership
* @return PR_TRUE if given tag can contain other tags
*/
PRBool CNavDTD::CanOmitEndTag(PRInt32 aParent,PRInt32 aChild) const {
PRBool result=PR_FALSE;
//begin with some simple (and obvious) cases...
switch((eHTMLTags)aChild) {
case eHTMLTag_userdefined:
case eHTMLTag_comment:
result=PR_TRUE;
break;
case eHTMLTag_h1: case eHTMLTag_h2:
case eHTMLTag_h3: case eHTMLTag_h4:
case eHTMLTag_h5: case eHTMLTag_h6:
{
if(0!=strchr(gHeadingTags,aParent))
result=PR_FALSE;
//Actually, we probably need to walk the stack here...
else result=PR_TRUE;
}
break;
case eHTMLTag_select: case eHTMLTag_option:
case eHTMLTag_button: case eHTMLTag_fieldset:
case eHTMLTag_input: case eHTMLTag_isindex:
case eHTMLTag_label: case eHTMLTag_legend:
case eHTMLTag_textarea:
if(PR_FALSE==mParser->HasOpenContainer(aChild))
result=PR_TRUE;
break;
case eHTMLTag_newline:
case eHTMLTag_whitespace:
switch((eHTMLTags)aParent) {
case eHTMLTag_html: case eHTMLTag_head:
case eHTMLTag_title: case eHTMLTag_map:
case eHTMLTag_tr: case eHTMLTag_table:
case eHTMLTag_thead: case eHTMLTag_tfoot:
case eHTMLTag_tbody: case eHTMLTag_col:
case eHTMLTag_colgroup: case eHTMLTag_unknown:
result=PR_TRUE;
default:
break;
} //switch
break;
default:
result=(!mParser->HasOpenContainer(aChild));
break;
} //switch
return result;
}
/**
* This method gets called to determine whether a given
* tag is itself a container
*
* @update gess 4/8/98
* @param aTag -- tag to test for containership
* @return PR_TRUE if given tag can contain other tags
*/
PRBool CNavDTD::IsContainer(PRInt32 aTag) const {
PRBool result=PR_FALSE;
switch(aTag){
case eHTMLTag_area: case eHTMLTag_base:
case eHTMLTag_basefont: case eHTMLTag_br:
case eHTMLTag_col: case eHTMLTag_colgroup:
case eHTMLTag_frame:
case eHTMLTag_hr: case eHTMLTag_img:
case eHTMLTag_input: case eHTMLTag_isindex:
case eHTMLTag_link:
case eHTMLTag_math: case eHTMLTag_meta:
// case eHTMLTag_option:
case eHTMLTag_param:
case eHTMLTag_style: case eHTMLTag_spacer:
case eHTMLTag_wbr:
case eHTMLTag_form:
case eHTMLTag_newline:
case eHTMLTag_whitespace:
case eHTMLTag_text:
result=PR_FALSE;
break;
default:
result=PR_TRUE;
}
return result;
}
/**
* This method does two things: 1st, help construct
* our own internal model of the content-stack; and
* 2nd, pass this message on to the sink.
* @update gess4/6/98
* @param aNode -- next node to be added to model
* @return TRUE if ok, FALSE if error
*/
PRInt32 CNavDTD::GetDefaultParentTagFor(PRInt32 aTag) const{
eHTMLTags result=eHTMLTag_unknown;
switch(aTag) {
case eHTMLTag_text:
result=eHTMLTag_paragraph; break;
case eHTMLTag_html:
result=eHTMLTag_unknown; break;
case eHTMLTag_body:
case eHTMLTag_head:
case eHTMLTag_header:
case eHTMLTag_footer:
case eHTMLTag_frameset:
result=eHTMLTag_html; break;
//These tags are head specific...
case eHTMLTag_style:
case eHTMLTag_meta:
case eHTMLTag_title:
case eHTMLTag_base:
case eHTMLTag_link:
result=eHTMLTag_head; break;
//These tags are table specific...
case eHTMLTag_caption:
case eHTMLTag_colgroup:
case eHTMLTag_tbody:
case eHTMLTag_tfoot:
case eHTMLTag_thead:
result=eHTMLTag_table; break;
case eHTMLTag_tr:
result=eHTMLTag_tbody; break;
case eHTMLTag_td:
case eHTMLTag_th:
result=eHTMLTag_tr; break;
case eHTMLTag_col:
result=eHTMLTag_colgroup; break;
//These have to do with listings...
case eHTMLTag_listitem:
result=eHTMLTag_ul; break;
case eHTMLTag_dd:
case eHTMLTag_dt:
result=eHTMLTag_dl; break;
case eHTMLTag_option:
result=eHTMLTag_select; break;
//These have to do with image maps...
case eHTMLTag_area:
result=eHTMLTag_map; break;
//These have to do with applets...
case eHTMLTag_param:
result=eHTMLTag_applet; break;
//These have to do with frames...
case eHTMLTag_frame:
result=eHTMLTag_frameset; break;
default:
result=eHTMLTag_body; //XXX Hack! Just for now.
break;
}
return result;
}
/**
* This method gets called at various times by the parser
* whenever we want to verify a valid context stack. This
* method also gives us a hook to add debugging metrics.
*
* @update gess4/6/98
* @param aStack[] array of ints (tokens)
* @param aCount number of elements in given array
* @return TRUE if stack is valid, else FALSE
*/
PRBool CNavDTD::VerifyContextVector(PRInt32* aVector,PRInt32 aCount) const {
PRBool result=PR_TRUE;
if(aCount>0) {
}
return result;
}
/**
* This method tries to design a context vector (without actually
* changing our parser state) from the parent down to the
* child.
*
* @update gess4/6/98
* @param aVector is the string where we store our output vector
* in bottom-up order.
* @param aParent -- tag type of parent
* @param aChild -- tag type of child
* @return TRUE if propagation closes; false otherwise
*/
PRBool CNavDTD::ForwardPropagate(nsString& aVector,PRInt32 aParentTag,PRInt32 aChildTag) const {
PRBool result=PR_FALSE;
switch(aParentTag) {
case eHTMLTag_table:
case eHTMLTag_tr:
if(PR_TRUE==CanContain(eHTMLTag_td,aChildTag)) {
aVector.Append((PRUnichar)eHTMLTag_td);
result=BackwardPropagate(aVector,aParentTag,eHTMLTag_td);
// result=PR_TRUE;
}
break;
case eHTMLTag_th:
break;
default:
break;
}//switch
return result;
}
/**
* This method tries to design a context map (without actually
* changing our parser state) from the child up to the parent.
*
* @update gess4/6/98
* @param aVector is the string where we store our output vector
* in bottom-up order.
* @param aParent -- tag type of parent
* @param aChild -- tag type of child
* @return TRUE if propagation closes; false otherwise
*/
PRBool CNavDTD::BackwardPropagate(nsString& aVector,PRInt32 aParentTag,PRInt32 aChildTag) const {
PRBool result=PR_FALSE;
eHTMLTags theParentTag=(eHTMLTags)aChildTag;
// aVector.Truncate();
//create the necessary stack of parent tags...
//continue your search until you run out of known parents,
//or you find the specific parent you were given (aParentTag).
// aVector.Append((PRUnichar)aChildTag);
do {
theParentTag=(eHTMLTags)GetDefaultParentTagFor(theParentTag);
if(theParentTag!=eHTMLTag_unknown) {
aVector.Append((PRUnichar)theParentTag);
}
} while((theParentTag!=eHTMLTag_unknown) && (theParentTag!=aParentTag));
return PRBool(aParentTag==theParentTag);
}