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|
/*----------------------------------------------------------------------------
| Copyright (c) 2017 Rolf Ade (rolf@pointsman.de)
|-----------------------------------------------------------------------------
|
|
| The contents of this file are subject to the Mozilla Public License
| Version 2.0 (the "License"); you may not use this file except in
| compliance with the License. You may obtain a copy of the License at
| http://www.mozilla.org/MPL/
|
| Software distributed under the License is distributed on an "AS IS"
| basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
| License for the specific language governing rights and limitations
| under the License.
|
| Contributor(s):
|
|
| written by Rolf Ade
| March 2017
|
\---------------------------------------------------------------------------*/
#ifdef TDOM_HAVE_GUMBO
#define MAX_TAG_LEN 201
/*----------------------------------------------------------------------------
| Includes
|
\---------------------------------------------------------------------------*/
#include <tcl.h>
#include <dom.h>
#include "gumbo.h"
#include <assert.h>
static const char *xhtml = "http://www.w3.org/1999/xhtml";
static const char *svg = "http://www.w3.org/2000/svg";
static const char *mathml = "http://www.w3.org/1998/Math/MathML";
static const char *xlink = "http://www.w3.org/1999/xlink";
#ifdef DEBUG
# define DBG(x) x
#else
# define DBG(x)
#endif
static void
convertGumboToDom (
domNode *parent,
GumboNode *gumboParent,
int ignoreWhiteSpaces,
int ignorexmlns
)
{
int i, j, hnew;
GumboVector *children = &gumboParent->v.element.children;
GumboNode *child;
GumboElement *gumboElm;
GumboAttribute *gumboAtt;
const char *tag;
const char *attValue;
const char *attUri = NULL;
char buf[MAX_TAG_LEN];
domNode *node;
domNS *ns;
domNodeType nodeType = ALL_NODES;
domAttrNode *attr = NULL;
Tcl_HashEntry *h;
const char *elmns = NULL;
for (i = 0; i < children->length; ++i) {
child = (GumboNode*) (children->data[i]);
switch (child->type) {
case GUMBO_NODE_DOCUMENT:
assert(false &&
"This gumbo node type can't happen here.");
break;
case GUMBO_NODE_ELEMENT:
case GUMBO_NODE_TEMPLATE:
gumboElm = &child->v.element;
tag = gumbo_normalized_tagname(gumboElm->tag);
if (!domIsNAME(tag)) {
gumbo_tag_from_original_text(&gumboElm->original_tag);
if (gumboElm->original_tag.length < MAX_TAG_LEN - 1) {
strncpy(&buf[0],
gumboElm->original_tag.data,
gumboElm->original_tag.length);
buf[gumboElm->original_tag.length] = '\0';
Tcl_UtfToLower(&buf[0]);
if (!domIsNAME(&buf[0])) {
DBG(fprintf (stderr, "invalid tag name '%s'\n", tag););
continue;
}
tag = &buf[0];
} else {
/* Just skip this subtree */
DBG(fprintf(stderr, "long tag: %d bytes\n", gumboElm->original_tag.length););
continue;
}
}
if (!ignorexmlns) {
switch (gumboElm->tag_namespace) {
case GUMBO_NAMESPACE_HTML:
elmns = xhtml;
break;
case GUMBO_NAMESPACE_SVG:
elmns = svg;
break;
case GUMBO_NAMESPACE_MATHML:
elmns = mathml;
break;
default:
/* do nothing */
break;
}
}
if (elmns == NULL) {
node = domNewElementNode (parent->ownerDocument, tag);
} else {
DBG(fprintf (stderr, "namespaced node %s\n", tag););
node = domNewElementNodeNS (parent->ownerDocument, tag,
elmns);
}
domAppendChild(parent, node);
for (j = 0; j < gumboElm->attributes.length; ++j) {
gumboAtt = gumboElm->attributes.data[j];
/* This is to ensure the same behavior as the -html
* parser: if there is just the attribute name given
* in the source (as 'selected' on a checkbox) then do
* it the XHTML style (att value is the att name,
* selected="selected"). If there is any value given
* in the source, including the empty string, use
* that. See gumbo.h for the details why/how this
* works.*/
if (gumboAtt->original_value.data[0] != '"'
&& gumboAtt->original_value.data[0] != '\'') {
attValue = gumboAtt->name;
} else {
attValue = gumboAtt->value;
}
if (ignorexmlns) {
if (gumboAtt->attr_namespace != GUMBO_ATTR_NAMESPACE_NONE) {
if (gumboAtt->original_name.length < MAX_TAG_LEN - 1) {
strncpy(&buf[0],
gumboAtt->original_name.data,
gumboAtt->original_name.length);
buf[gumboAtt->original_name.length] = '\0';
Tcl_UtfToLower(&buf[0]);
DBG(fprintf (stderr, "original att name: %s\n",
&buf[0]););
if (!domIsNAME(&buf[0])) {
DBG(fprintf (stderr, "invalid att name '%s'\n", tag););
continue;
}
domSetAttribute(node, &buf[0], attValue);
} else {
continue;
}
} else {
attr = domSetAttribute (node, gumboAtt->name, attValue);
}
} else {
attUri = NULL;
switch (gumboAtt->attr_namespace) {
case GUMBO_ATTR_NAMESPACE_XLINK:
DBG(fprintf (stderr, "GUMBO_ATTR_NAMESPACE_XLINK\n"););
attUri = xlink;
break;
case GUMBO_ATTR_NAMESPACE_XMLNS:
DBG(fprintf (stderr, "GUMBO_ATTR_NAMESPACE_XMLNS\n"););
if (attValue[5] == ':') {
ns = domLookupPrefix (node, &(attValue[6]));
} else {
ns = domLookupPrefix (node, "");
}
DBG(fprintf (stderr, "xmns att name: %s\n att value %s\n",
gumboAtt->name,
attValue););
if (ns) {
if (strcmp(ns->uri, attValue) == 0) {
/* Namespace already in scope. Skip
* this attribute to prevent invalid
* double attributes and unnecessary
* namespace declarations. */
DBG(fprintf (stderr, "namespace %s already in scope\n",
attValue););
continue;
}
}
if (gumboAtt->original_name.length < MAX_TAG_LEN - 1) {
strncpy(&buf[0],
gumboAtt->original_name.data,
gumboAtt->original_name.length);
buf[gumboAtt->original_name.length] = '\0';
Tcl_UtfToLower(&buf[0]);
DBG(fprintf (stderr, "original att name: %s\n",
&buf[0]););
if (!domIsNAME(&buf[0])) {
DBG(fprintf (stderr, "invalid att name '%s'\n", tag););
continue;
}
domSetAttributeNS(node, &buf[0], attValue, NULL, 1);
}
continue;
case GUMBO_ATTR_NAMESPACE_XML:
/* The xml namespace is always in scope, nothing
* to do. */
continue;
default:
break;
}
if (attUri) {
if (gumboAtt->original_name.length < MAX_TAG_LEN - 1) {
strncpy(&buf[0],
gumboAtt->original_name.data,
gumboAtt->original_name.length);
buf[gumboAtt->original_name.length] = '\0';
Tcl_UtfToLower(&buf[0]);
DBG(fprintf (stderr, "original att name: %s\n",
&buf[0]););
if (!domIsNAME(&buf[0])) {
DBG(fprintf (stderr, "invalid att name '%s'\n", tag););
continue;
}
} else {
continue;
}
DBG(fprintf (stderr, "name: %s value %s\n", &buf[0], attValue););
attr = domSetAttributeNS (node, &buf[0],
attValue, xlink, 0);
DBG(fprintf(stderr, "attr: %p\n", attr););
} else {
attr = domSetAttribute (node, gumboAtt->name,
attValue);
}
}
if (attr) {
if (strcmp(gumboAtt->name, "id") == 0) {
if (!node->ownerDocument->ids) {
node->ownerDocument->ids = (Tcl_HashTable *)
MALLOC (sizeof (Tcl_HashTable));
Tcl_InitHashTable (
node->ownerDocument->ids,
TCL_STRING_KEYS);
}
h = Tcl_CreateHashEntry (
node->ownerDocument->ids,
gumboAtt->value,
&hnew);
/* How to resolve in case of dublicates? We
follow, what the core dom building code does:
the first value in document order wins. */
if (hnew) {
Tcl_SetHashValue (h, node);
attr->nodeFlags |= IS_ID_ATTRIBUTE;
}
}
}
}
convertGumboToDom(node, child, ignoreWhiteSpaces, ignorexmlns);
break;
case GUMBO_NODE_WHITESPACE:
if (ignoreWhiteSpaces) {
continue;
}
/* fall through */;
case GUMBO_NODE_CDATA:
case GUMBO_NODE_TEXT:
nodeType = TEXT_NODE
/* fall through */;
case GUMBO_NODE_COMMENT:
if (nodeType == ALL_NODES) nodeType = COMMENT_NODE;
node = (domNode*)domNewTextNode(parent->ownerDocument,
child->v.text.text,
strlen(child->v.text.text),
nodeType);
domAppendChild(parent, node);
break;
default:
assert(false && "unknown node type");
}
}
}
domDocument *
HTML_GumboParseDocument (
char *html, /* Complete text of the XML being parsed. */
int ignoreWhiteSpaces,
int ignorexmlns
) {
domDocument *doc = domCreateDoc(NULL, 0);
GumboOutput *output = gumbo_parse(html);
GumboDocument* doctype = & output->document->v.document;
/* Generate and populate doctype info. */
doc->doctype = (domDocInfo *)MALLOC(sizeof(domDocInfo));
memset(doc->doctype, 0,(sizeof(domDocInfo)));
doc->doctype->publicId = tdomstrdup(doctype->public_identifier);
doc->doctype->systemId = tdomstrdup(doctype->system_identifier);
convertGumboToDom (doc->rootNode, output->document, ignoreWhiteSpaces,
ignorexmlns);
domSetDocumentElement (doc);
gumbo_destroy_output(&kGumboDefaultOptions, output);
return doc;
}
#else
typedef int make_pedantic_compiler_happy;
#endif
|
