/* This file was copied from omega-0.8.5->1.2.6 and modified */
/* myhtmlparse.cc: subclass of HtmlParser for extracting text
*
* ----START-LICENCE----
* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2002,2003,2004 Olly Betts
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
* -----END-LICENCE-----
*/
#include <time.h>
#include <stdio.h>
#include <algorithm>
#include <cstring>
#include "cstr.h"
#include "myhtmlparse.h"
#include "indextext.h" // for lowercase_term()
#include "mimeparse.h"
#include "smallut.h"
#include "cancelcheck.h"
#include "debuglog.h"
#include "transcode.h"
static const string cstr_html_charset("charset");
static const string cstr_html_content("content");
inline static bool
p_notdigit(char c)
{
return !isdigit(static_cast<unsigned char>(c));
}
inline static bool
p_notxdigit(char c)
{
return !isxdigit(static_cast<unsigned char>(c));
}
inline static bool
p_notalnum(char c)
{
return !isalnum(static_cast<unsigned char>(c));
}
/*
* The following array was taken from Estraier. Estraier was
* written by Mikio Hirabayashi.
* Copyright (C) 2003-2004 Mikio Hirabayashi
* The version where this comes from
* is covered by the GNU licence, as this file.*/
static const char *epairs[] = {
/* basic symbols */
"amp", "&", "lt", "<", "gt", ">", "quot", "\"", "apos", "'",
/* ISO-8859-1 */
"nbsp", "\xc2\xa0", "iexcl", "\xc2\xa1", "cent", "\xc2\xa2",
"pound", "\xc2\xa3", "curren", "\xc2\xa4", "yen", "\xc2\xa5",
"brvbar", "\xc2\xa6", "sect", "\xc2\xa7", "uml", "\xc2\xa8",
"copy", "\xc2\xa9", "ordf", "\xc2\xaa", "laquo", "\xc2\xab",
"not", "\xc2\xac", "shy", "\xc2\xad", "reg", "\xc2\xae",
"macr", "\xc2\xaf", "deg", "\xc2\xb0", "plusmn", "\xc2\xb1",
"sup2", "\xc2\xb2", "sup3", "\xc2\xb3", "acute", "\xc2\xb4",
"micro", "\xc2\xb5", "para", "\xc2\xb6", "middot", "\xc2\xb7",
"cedil", "\xc2\xb8", "sup1", "\xc2\xb9", "ordm", "\xc2\xba",
"raquo", "\xc2\xbb", "frac14", "\xc2\xbc", "frac12", "\xc2\xbd",
"frac34", "\xc2\xbe", "iquest", "\xc2\xbf", "Agrave", "\xc3\x80",
"Aacute", "\xc3\x81", "Acirc", "\xc3\x82", "Atilde", "\xc3\x83",
"Auml", "\xc3\x84", "Aring", "\xc3\x85", "AElig", "\xc3\x86",
"Ccedil", "\xc3\x87", "Egrave", "\xc3\x88", "Eacute", "\xc3\x89",
"Ecirc", "\xc3\x8a", "Euml", "\xc3\x8b", "Igrave", "\xc3\x8c",
"Iacute", "\xc3\x8d", "Icirc", "\xc3\x8e", "Iuml", "\xc3\x8f",
"ETH", "\xc3\x90", "Ntilde", "\xc3\x91", "Ograve", "\xc3\x92",
"Oacute", "\xc3\x93", "Ocirc", "\xc3\x94", "Otilde", "\xc3\x95",
"Ouml", "\xc3\x96", "times", "\xc3\x97", "Oslash", "\xc3\x98",
"Ugrave", "\xc3\x99", "Uacute", "\xc3\x9a", "Ucirc", "\xc3\x9b",
"Uuml", "\xc3\x9c", "Yacute", "\xc3\x9d", "THORN", "\xc3\x9e",
"szlig", "\xc3\x9f", "agrave", "\xc3\xa0", "aacute", "\xc3\xa1",
"acirc", "\xc3\xa2", "atilde", "\xc3\xa3", "auml", "\xc3\xa4",
"aring", "\xc3\xa5", "aelig", "\xc3\xa6", "ccedil", "\xc3\xa7",
"egrave", "\xc3\xa8", "eacute", "\xc3\xa9", "ecirc", "\xc3\xaa",
"euml", "\xc3\xab", "igrave", "\xc3\xac", "iacute", "\xc3\xad",
"icirc", "\xc3\xae", "iuml", "\xc3\xaf", "eth", "\xc3\xb0",
"ntilde", "\xc3\xb1", "ograve", "\xc3\xb2", "oacute", "\xc3\xb3",
"ocirc", "\xc3\xb4", "otilde", "\xc3\xb5", "ouml", "\xc3\xb6",
"divide", "\xc3\xb7", "oslash", "\xc3\xb8", "ugrave", "\xc3\xb9",
"uacute", "\xc3\xba", "ucirc", "\xc3\xbb", "uuml", "\xc3\xbc",
"yacute", "\xc3\xbd", "thorn", "\xc3\xbe", "yuml", "\xc3\xbf",
/* ISO-10646 */
"fnof", "\xc6\x92", "Alpha", "\xce\x91", "Beta", "\xce\x92",
"Gamma", "\xce\x93", "Delta", "\xce\x94", "Epsilon", "\xce\x95",
"Zeta", "\xce\x96", "Eta", "\xce\x97", "Theta", "\xce\x98",
"Iota", "\xce\x99", "Kappa", "\xce\x9a", "Lambda", "\xce\x9b",
"Mu", "\xce\x9c", "Nu", "\xce\x9d", "Xi", "\xce\x9e",
"Omicron", "\xce\x9f", "Pi", "\xce\xa0", "Rho", "\xce\xa1",
"Sigma", "\xce\xa3", "Tau", "\xce\xa4", "Upsilon", "\xce\xa5",
"Phi", "\xce\xa6", "Chi", "\xce\xa7", "Psi", "\xce\xa8",
"Omega", "\xce\xa9", "alpha", "\xce\xb1", "beta", "\xce\xb2",
"gamma", "\xce\xb3", "delta", "\xce\xb4", "epsilon", "\xce\xb5",
"zeta", "\xce\xb6", "eta", "\xce\xb7", "theta", "\xce\xb8",
"iota", "\xce\xb9", "kappa", "\xce\xba", "lambda", "\xce\xbb",
"mu", "\xce\xbc", "nu", "\xce\xbd", "xi", "\xce\xbe",
"omicron", "\xce\xbf", "pi", "\xcf\x80", "rho", "\xcf\x81",
"sigmaf", "\xcf\x82", "sigma", "\xcf\x83", "tau", "\xcf\x84",
"upsilon", "\xcf\x85", "phi", "\xcf\x86", "chi", "\xcf\x87",
"psi", "\xcf\x88", "omega", "\xcf\x89", "thetasym", "\xcf\x91",
"upsih", "\xcf\x92", "piv", "\xcf\x96", "bull", "\xe2\x80\xa2",
"hellip", "\xe2\x80\xa6", "prime", "\xe2\x80\xb2", "Prime", "\xe2\x80\xb3",
"oline", "\xe2\x80\xbe", "frasl", "\xe2\x81\x84", "weierp", "\xe2\x84\x98",
"image", "\xe2\x84\x91", "real", "\xe2\x84\x9c", "trade", "\xe2\x84\xa2",
"alefsym", "\xe2\x84\xb5", "larr", "\xe2\x86\x90", "uarr", "\xe2\x86\x91",
"rarr", "\xe2\x86\x92", "darr", "\xe2\x86\x93", "harr", "\xe2\x86\x94",
"crarr", "\xe2\x86\xb5", "lArr", "\xe2\x87\x90", "uArr", "\xe2\x87\x91",
"rArr", "\xe2\x87\x92", "dArr", "\xe2\x87\x93", "hArr", "\xe2\x87\x94",
"forall", "\xe2\x88\x80", "part", "\xe2\x88\x82", "exist", "\xe2\x88\x83",
"empty", "\xe2\x88\x85", "nabla", "\xe2\x88\x87", "isin", "\xe2\x88\x88",
"notin", "\xe2\x88\x89", "ni", "\xe2\x88\x8b", "prod", "\xe2\x88\x8f",
"sum", "\xe2\x88\x91", "minus", "\xe2\x88\x92", "lowast", "\xe2\x88\x97",
"radic", "\xe2\x88\x9a", "prop", "\xe2\x88\x9d", "infin", "\xe2\x88\x9e",
"ang", "\xe2\x88\xa0", "and", "\xe2\x88\xa7", "or", "\xe2\x88\xa8",
"cap", "\xe2\x88\xa9", "cup", "\xe2\x88\xaa", "int", "\xe2\x88\xab",
"there4", "\xe2\x88\xb4", "sim", "\xe2\x88\xbc", "cong", "\xe2\x89\x85",
"asymp", "\xe2\x89\x88", "ne", "\xe2\x89\xa0", "equiv", "\xe2\x89\xa1",
"le", "\xe2\x89\xa4", "ge", "\xe2\x89\xa5", "sub", "\xe2\x8a\x82",
"sup", "\xe2\x8a\x83", "nsub", "\xe2\x8a\x84", "sube", "\xe2\x8a\x86",
"supe", "\xe2\x8a\x87", "oplus", "\xe2\x8a\x95", "otimes", "\xe2\x8a\x97",
"perp", "\xe2\x8a\xa5", "sdot", "\xe2\x8b\x85", "lceil", "\xe2\x8c\x88",
"rceil", "\xe2\x8c\x89", "lfloor", "\xe2\x8c\x8a", "rfloor", "\xe2\x8c\x8b",
"lang", "\xe2\x8c\xa9", "rang", "\xe2\x8c\xaa", "loz", "\xe2\x97\x8a",
"spades", "\xe2\x99\xa0", "clubs", "\xe2\x99\xa3", "hearts", "\xe2\x99\xa5",
"diams", "\xe2\x99\xa6", "OElig", "\xc5\x92", "oelig", "\xc5\x93",
"Scaron", "\xc5\xa0", "scaron", "\xc5\xa1", "Yuml", "\xc5\xb8",
"circ", "\xcb\x86", "tilde", "\xcb\x9c", "ensp", "\xe2\x80\x82",
"emsp", "\xe2\x80\x83", "thinsp", "\xe2\x80\x89", "zwnj", "\xe2\x80\x8c",
"zwj", "\xe2\x80\x8d", "lrm", "\xe2\x80\x8e", "rlm", "\xe2\x80\x8f",
"ndash", "\xe2\x80\x93", "mdash", "\xe2\x80\x94", "lsquo", "\xe2\x80\x98",
"rsquo", "\xe2\x80\x99", "sbquo", "\xe2\x80\x9a", "ldquo", "\xe2\x80\x9c",
"rdquo", "\xe2\x80\x9d", "bdquo", "\xe2\x80\x9e", "dagger", "\xe2\x80\xa0",
"Dagger", "\xe2\x80\xa1", "permil", "\xe2\x80\xb0", "lsaquo", "\xe2\x80\xb9",
"rsaquo", "\xe2\x80\xba", "euro", "\xe2\x82\xac",
NULL, NULL
};
map<string, string> my_named_ents;
class NamedEntsInitializer {
public:
NamedEntsInitializer()
{
for (int i = 0;;) {
const char *ent;
const char *val;
ent = epairs[i++];
if (ent == 0)
break;
val = epairs[i++];
if (val == 0)
break;
my_named_ents[string(ent)] = val;
}
}
};
static NamedEntsInitializer namedEntsInitializerInstance;
MyHtmlParser::MyHtmlParser()
: in_script_tag(false),
in_style_tag(false),
in_pre_tag(false),
pending_space(false),
indexing_allowed(true)
{
// The default html document charset is iso-8859-1. We'll update
// this value from the encoding tag if found.
charset = "iso-8859-1";
}
void MyHtmlParser::decode_entities(string &s)
{
LOGDEB2(("MyHtmlParser::decode_entities\n"));
// This has no meaning whatsoever if the character encoding is unknown,
// so don't do it. If charset known, caller has converted text to utf-8,
// and this is also how we translate entities
// if (tocharset != "utf-8")
// return;
// We need a const_iterator version of s.end() - otherwise the
// find() and find_if() templates don't work...
string::const_iterator amp = s.begin(), s_end = s.end();
while ((amp = find(amp, s_end, '&')) != s_end) {
unsigned int val = 0;
string::const_iterator end, p = amp + 1;
string subs;
if (p != s_end && *p == '#') {
p++;
if (p != s_end && (*p == 'x' || *p == 'X')) {
// hex
p++;
end = find_if(p, s_end, p_notxdigit);
sscanf(s.substr(p - s.begin(), end - p).c_str(), "%x", &val);
} else {
// number
end = find_if(p, s_end, p_notdigit);
val = atoi(s.substr(p - s.begin(), end - p).c_str());
}
} else {
end = find_if(p, s_end, p_notalnum);
string code = s.substr(p - s.begin(), end - p);
map<string, string>::const_iterator i;
i = my_named_ents.find(code);
if (i != my_named_ents.end())
subs = i->second;
}
if (end < s_end && *end == ';')
end++;
if (val) {
// The code is the code position for a unicode char. We need
// to translate it to an utf-8 string.
string utf16be;
utf16be += char(val / 256);
utf16be += char(val % 256);
transcode(utf16be, subs, "UTF-16BE", "UTF-8");
}
if (subs.length() > 0) {
string::size_type amp_pos = amp - s.begin();
s.replace(amp_pos, end - amp, subs);
s_end = s.end();
// We've modified the string, so the iterators are no longer
// valid...
amp = s.begin() + amp_pos + subs.length();
} else {
amp = end;
}
}
}
// Compress whitespace and suppress newlines
// Note that we independantly add some newlines to the output text in the
// tag processing code. Like this, the preview looks a bit more like what a
// browser would display.
// We keep whitespace inside <pre> tags
void
MyHtmlParser::process_text(const string &text)
{
LOGDEB2(("process_text: pending_space %d txt [%s]\n", pending_space,
text.c_str()));
CancelCheck::instance().checkCancel();
if (!in_script_tag && !in_style_tag) {
if (!in_pre_tag) {
string::size_type b = 0;
bool only_space = true;
while ((b = text.find_first_not_of(WHITESPACE, b)) != string::npos) {
only_space = false;
// If space specifically needed or chunk begins with
// whitespace, add exactly one space
if (pending_space || b != 0) {
dump += ' ';
}
pending_space = true;
string::size_type e = text.find_first_of(WHITESPACE, b);
if (e == string::npos) {
dump += text.substr(b);
pending_space = false;
break;
}
dump += text.substr(b, e - b);
b = e + 1;
}
if (only_space)
pending_space = true;
} else {
if (pending_space)
dump += ' ';
dump += text;
}
}
}
bool
MyHtmlParser::opening_tag(const string &tag)
{
LOGDEB2(("opening_tag: [%s]\n", tag.c_str()));
#if 0
cout << "TAG: " << tag << ": " << endl;
map<string, string>::const_iterator x;
for (x = p.begin(); x != p.end(); x++) {
cout << " " << x->first << " -> '" << x->second << "'" << endl;
}
#endif
if (tag.empty()) return true;
switch (tag[0]) {
case 'a':
if (tag == "address") pending_space = true;
break;
case 'b':
// body: some bad docs have several opening body tags and
// even text before the body is displayed by Opera and
// Firefox. We used to reset the dump each time we saw a
// body tag, but I can't see any reason to do so.
if (tag == "blockquote" || tag == "br") {
dump += '\n';
pending_space = true;
}
break;
case 'c':
if (tag == "center") pending_space = true;
break;
case 'd':
if (tag == "dd" || tag == "dir" || tag == "div" || tag == "dl" ||
tag == "dt") pending_space = true;
if (tag == "dt")
dump += '\n';
break;
case 'e':
if (tag == "embed") pending_space = true;
break;
case 'f':
if (tag == "fieldset" || tag == "form") pending_space = true;
break;
case 'h':
// hr, and h1, ..., h6
if (tag.length() == 2 && strchr("r123456", tag[1])) {
dump += '\n';
pending_space = true;
}
break;
case 'i':
if (tag == "iframe" || tag == "img" || tag == "isindex" ||
tag == "input") pending_space = true;
break;
case 'k':
if (tag == "keygen") pending_space = true;
break;
case 'l':
if (tag == "legend" || tag == "li" || tag == "listing") {
dump += '\n';
pending_space = true;
}
break;
case 'm':
if (tag == "meta") {
string content;
if (get_parameter(cstr_html_content, content)) {
string name;
if (get_parameter("name", name)) {
lowercase_term(name);
if (name == "date") {
// Yes this doesnt exist. It's output by filters
// And the format isn't even standard http/html
// FIXME
decode_entities(content);
struct tm tm;
if (strptime(content.c_str(),
" %Y-%m-%d %H:%M:%S ", &tm) ||
strptime(content.c_str(),
"%Y-%m-%dT%H:%M:%S", &tm)
) {
char ascuxtime[100];
sprintf(ascuxtime, "%ld", (long)mktime(&tm));
dmtime = ascuxtime;
}
} else if (name == "robots") {
} else {
if (!meta[name].empty())
meta[name] += ' ';
decode_entities(content);
meta[name] += content;
}
}
string hdr;
if (get_parameter("http-equiv", hdr)) {
lowercase_term(hdr);
if (hdr == "content-type") {
MimeHeaderValue p;
parseMimeHeaderValue(content, p);
map<string, string>::const_iterator k;
if ((k = p.params.find(cstr_html_charset)) !=
p.params.end()) {
charset = k->second;
if (!samecharset(charset, fromcharset)) {
LOGDEB1(("Doc http-equiv charset '%s' "
"differs from dir deflt '%s'\n",
charset.c_str(),
fromcharset.c_str()));
throw false;
}
}
}
}
}
string newcharset;
if (get_parameter(cstr_html_charset, newcharset)) {
// HTML5 added: <meta charset="...">
lowercase_term(newcharset);
charset = newcharset;
if (!samecharset(charset, fromcharset)) {
LOGDEB1(("Doc html5 charset '%s' "
"differs from dir deflt '%s'\n",
charset.c_str(),
fromcharset.c_str()));
throw false;
}
}
break;
}
if (tag == "marquee" || tag == "menu" || tag == "multicol")
pending_space = true;
break;
case 'o':
if (tag == "ol" || tag == "option") pending_space = true;
break;
case 'p':
if (tag == "p" || tag == "plaintext") {
dump += '\n';
pending_space = true;
} else if (tag == "pre") {
in_pre_tag = true;
dump += '\n';
pending_space = true;
}
break;
case 'q':
if (tag == "q") pending_space = true;
break;
case 's':
if (tag == "style") {
in_style_tag = true;
break;
}
if (tag == "script") {
in_script_tag = true;
break;
}
if (tag == "select") pending_space = true;
break;
case 't':
if (tag == "table" || tag == "td" || tag == "textarea" ||
tag == "th") pending_space = true;
break;
case 'u':
if (tag == "ul") pending_space = true;
break;
case 'x':
if (tag == "xmp") pending_space = true;
break;
}
return true;
}
bool
MyHtmlParser::closing_tag(const string &tag)
{
LOGDEB2(("closing_tag: [%s]\n", tag.c_str()));
if (tag.empty()) return true;
switch (tag[0]) {
case 'a':
if (tag == "address") pending_space = true;
break;
case 'b':
// body: We used to signal and end of doc here by returning
// false but the browsers just ignore body and html
// closing tags if there is further text, so it seems right
// to do the same
if (tag == "blockquote" || tag == "br") pending_space = true;
break;
case 'c':
if (tag == "center") pending_space = true;
break;
case 'd':
if (tag == "dd" || tag == "dir" || tag == "div" || tag == "dl" ||
tag == "dt") pending_space = true;
break;
case 'f':
if (tag == "fieldset" || tag == "form") pending_space = true;
break;
case 'h':
// hr, and h1, ..., h6
if (tag.length() == 2 && strchr("r123456", tag[1]))
pending_space = true;
break;
case 'i':
if (tag == "iframe") pending_space = true;
break;
case 'l':
if (tag == "legend" || tag == "li" || tag == "listing")
pending_space = true;
break;
case 'm':
if (tag == "marquee" || tag == "menu") pending_space = true;
break;
case 'o':
if (tag == "ol" || tag == "option") pending_space = true;
break;
case 'p':
if (tag == "p") {
pending_space = true;
} else if (tag == "pre") {
pending_space = true;
in_pre_tag = false;
}
break;
case 'q':
if (tag == "q") pending_space = true;
break;
case 's':
if (tag == "style") {
in_style_tag = false;
break;
}
if (tag == "script") {
in_script_tag = false;
break;
}
if (tag == "select") pending_space = true;
break;
case 't':
if (tag == "title") {
if (meta.find("title") == meta.end()|| meta["title"].empty()) {
meta["title"] = dump;
dump.clear();
}
break;
}
if (tag == "table" || tag == "td" || tag == "textarea" ||
tag == "th") pending_space = true;
break;
case 'u':
if (tag == "ul") pending_space = true;
break;
case 'x':
if (tag == "xmp") pending_space = true;
break;
}
return true;
}
// This gets called when hitting eof.
// We used to do:
// > If the <body> is open, do
// > something with the text (that is, don't throw up). Else, things are
// > too weird, throw an error. We don't get called if the parser finds
// > a closing body tag (exception gets thrown by closing_tag())
// But we don't throw any more. Whatever text we've extracted up to now is
// better than nothing.
void
MyHtmlParser::do_eof()
{
}