https://github.com/cran/XML
Tip revision: d8b36ec3455b754f80d5cfaaa3e5e249e28bcb08 authored by Duncan Temple Lang on 25 June 2009, 00:00:00 UTC
version 2.5-3
version 2.5-3
Tip revision: d8b36ec
HTMLParse.c
/*
This file uses the HTML parser in libxml to provide an HTML
parser in R that is basically identical to the XML parsing interface.
It can handle files, URLs, compressed files, and raw HTML text.
It drops the DTD and validation options since these are not very relevant
for HTML. (We can add put them back if anyone wants!)
*/
#include "DocParse.h"
#include "Utils.h"
#include "libxml/HTMLparser.h"
#include <sys/stat.h>
#include <unistd.h>
USER_OBJECT_
RS_XML(HtmlParseTree)(USER_OBJECT_ fileName, USER_OBJECT_ converterFunctions,
USER_OBJECT_ skipBlankLines, USER_OBJECT_ replaceEntities,
USER_OBJECT_ asText, USER_OBJECT_ trim, USER_OBJECT_ isURL)
{
const char *name;
xmlDocPtr doc;
USER_OBJECT_ rdoc;
USER_OBJECT_ className;
R_XMLSettings parserSettings;
int freeName = 0;
int asTextBuffer = LOGICAL_DATA(asText)[0];
int isURLDoc = LOGICAL_DATA(isURL)[0];
parserSettings.skipBlankLines = LOGICAL_DATA(skipBlankLines)[0];
parserSettings.converters = converterFunctions;
parserSettings.trim = LOGICAL_DATA(trim)[0];
if(asTextBuffer == 0) {
struct stat tmp_stat;
#ifdef USE_R
name = CHAR(STRING_ELT(fileName, 0));
#else
name = CHARACTER_DATA(fileName)[0];
#endif
if(!isURLDoc && (name == NULL || stat(name, &tmp_stat) < 0)) {
PROBLEM "Can't find file %s", CHAR_DEREF(STRING_ELT(fileName, 0))
ERROR;
}
} else {
name = strdup(CHAR_DEREF(STRING_ELT(fileName, 0)));
freeName = 1;
}
#if 0
/* If one wants entities expanded directly and to appear as text. */
if(LOGICAL_DATA(replaceEntities)[0])
xmlSubstituteEntitiesDefault(1);
#endif
if(asTextBuffer) {
doc = htmlParseDoc(CHAR_TO_XMLCHAR(name), NULL);
if(doc != NULL) {
doc->name = (char *) xmlStrdup(CHAR_TO_XMLCHAR("<buffer>"));
}
} else {
doc = htmlParseFile(name, NULL);
}
if(doc == NULL) {
if(freeName && name)
free((char *) name);
PROBLEM "error in creating parser for %s", name
ERROR;
}
PROTECT(rdoc = RS_XML(convertXMLDoc)(name, doc, converterFunctions, &parserSettings));
if(freeName && name)
free((char *) name);
#if 0
xmlFreeDoc(doc);
R_numXMLDocsFreed++;
#endif
/* Set the class for the document. */
className = NEW_CHARACTER(1);
PROTECT(className);
SET_STRING_ELT(className, 0, mkChar("HTMLDocument"));
SET_CLASS(rdoc, className);
UNPROTECT(1);
UNPROTECT(1);
return(rdoc);
}