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#include <htmlrenderer.h>
#include <xmlpullparser.h>
#include <utils.h>
#include <sstream>
#include <cstdio>
#include <iostream>
#include <cstring>
#include <stdexcept>
#include <algorithm>
#include <logger.h>
#include <libgen.h>
#include <config.h>
using namespace newsbeuter;
htmlrenderer::htmlrenderer(unsigned int width) : w(width) {
tags["a"] = TAG_A;
tags["embed"] = TAG_EMBED;
tags["br"] = TAG_BR;
tags["pre"] = TAG_PRE;
tags["ituneshack"] = TAG_ITUNESHACK;
tags["img"] = TAG_IMG;
tags["blockquote"] = TAG_BLOCKQUOTE;
tags["p"] = TAG_P;
tags["ol"] = TAG_OL;
tags["ul"] = TAG_UL;
tags["li"] = TAG_LI;
tags["dt"] = TAG_DT;
tags["dd"] = TAG_DD;
tags["dl"] = TAG_DL;
tags["sup"] = TAG_SUP;
tags["sub"] = TAG_SUB;
tags["hr"] = TAG_HR;
}
void htmlrenderer::render(const std::string& source, std::vector<std::string>& lines, std::vector<linkpair>& links, const std::string& url) {
std::istringstream input(source);
render(input, lines, links, url);
}
unsigned int htmlrenderer::add_link(std::vector<linkpair>& links, const std::string& link, link_type type) {
bool found = false;
unsigned int i=1;
for (std::vector<linkpair>::iterator it=links.begin();it!=links.end();++it, ++i) {
if (it->first == link) {
found = true;
break;
}
}
if (!found)
links.push_back(linkpair(link,type));
return i;
}
void htmlrenderer::render(std::istream& input, std::vector<std::string>& lines, std::vector<linkpair>& links, const std::string& url) {
unsigned int image_count = 0;
std::string curline;
int indent_level = 0;
bool inside_list = false, inside_li = false, is_ol = false, inside_pre = false;
bool itunes_hack = false;
unsigned int ol_count = 1;
htmltag current_tag;
/*
* to render the HTML, we use a self-developed "XML" pull parser.
*
* A pull parser works like this:
* - we feed it with an XML stream
* - we then gather an iterator
* - we then can iterate over all continuous elements, such as start tag, close tag, text element, ...
*/
xmlpullparser xpp;
xpp.setInput(input);
for (xmlpullparser::event e = xpp.next(); e != xmlpullparser::END_DOCUMENT; e = xpp.next()) {
std::string tagname;
switch (e) {
case xmlpullparser::START_TAG:
tagname = xpp.getText();
std::transform(tagname.begin(), tagname.end(), tagname.begin(), ::tolower);
current_tag = tags[tagname];
GetLogger().log(LOG_DEBUG,"htmlrenderer::render: found start tag %s (id = %u)",tagname.c_str(), current_tag);
switch (current_tag) {
case TAG_A: {
std::string link;
try {
link = xpp.getAttributeValue("href");
} catch (const std::invalid_argument& ) {
GetLogger().log(LOG_WARN,"htmlrenderer::render: found a tag with no href attribute");
link = "";
}
if (link.length() > 0) {
unsigned int link_num = add_link(links,utils::absolute_url(url,link), LINK_HREF);
std::ostringstream ref;
ref << "[" << link_num << "]";
curline.append(ref.str());
}
}
break;
case TAG_EMBED: {
std::string type;
try {
type = xpp.getAttributeValue("type");
} catch (const std::invalid_argument& ) {
GetLogger().log(LOG_WARN, "htmlrenderer::render: found embed object without type attribute");
type = "";
}
if (type == "application/x-shockwave-flash") {
std::string link;
try {
link = xpp.getAttributeValue("src");
} catch (const std::invalid_argument& ) {
GetLogger().log(LOG_WARN, "htmlrenderer::render: found embed object without src attribute");
link = "";
}
if (link.length() > 0) {
unsigned int link_num = add_link(links,utils::absolute_url(url,link), LINK_EMBED);
std::ostringstream ref;
ref << "[" << _("embedded flash:") << " " << link_num << "]";
curline.append(ref.str());
}
}
}
break;
case TAG_BR:
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: pushing back `%s'", curline.c_str());
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_PRE:
inside_pre = true;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_ITUNESHACK:
itunes_hack = true;
break;
case TAG_IMG: {
std::string imgurl;
try {
imgurl = xpp.getAttributeValue("src");
} catch (const std::invalid_argument& ) {
GetLogger().log(LOG_WARN,"htmlrenderer::render: found img tag with no src attribute");
imgurl = "";
}
if (imgurl.length() > 0) {
unsigned int link_num = add_link(links,utils::absolute_url(url,imgurl), LINK_IMG);
std::ostringstream ref;
ref << "[" << _("image") << " " << link_num << "]";
image_count++;
curline.append(ref.str());
}
}
break;
case TAG_BLOCKQUOTE:
++indent_level;
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_P:
if (line_is_nonempty(curline))
lines.push_back(curline);
if (lines.size() > 0 && lines[lines.size()-1].length() > static_cast<unsigned int>(indent_level*2))
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_OL:
inside_list = true;
is_ol = true;
ol_count = 1;
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_UL:
inside_list = true;
is_ol = false;
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_LI:
if (inside_li) {
indent_level-=2;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
}
inside_li = true;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
indent_level+=2;
if (is_ol) {
std::ostringstream num;
num << ol_count;
if (ol_count < 10)
curline.append(" ");
curline.append(num.str());
curline.append(". ");
++ol_count;
} else {
curline.append(" * ");
}
break;
case TAG_DT:
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_DD:
indent_level+=4;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_DL:
// ignore tag
break;
case TAG_SUP:
curline.append("^");
break;
case TAG_SUB:
curline.append("[");
break;
case TAG_HR:
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
lines.push_back(std::string(" ") + std::string(w - 2, '-') + std::string(" "));
prepare_newline(curline, indent_level);
break;
}
break;
case xmlpullparser::END_TAG:
tagname = xpp.getText();
std::transform(tagname.begin(), tagname.end(), tagname.begin(), ::tolower);
current_tag = tags[tagname];
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: found end tag %s (id = %u)",tagname.c_str(), current_tag);
switch (current_tag) {
case TAG_BLOCKQUOTE:
--indent_level;
if (indent_level < 0)
indent_level = 0;
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_OL:
case TAG_UL:
inside_list = false;
if (inside_li) {
indent_level-=2;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
}
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_DT:
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_DD:
indent_level-=4;
if (line_is_nonempty(curline))
lines.push_back(curline);
lines.push_back("");
prepare_newline(curline, indent_level);
break;
case TAG_DL:
// ignore tag
break;
case TAG_LI:
indent_level-=2;
inside_li = false;
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_P:
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
break;
case TAG_PRE:
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
inside_pre = false;
break;
case TAG_SUB:
curline.append("]");
break;
case TAG_SUP:
// has closing tag, but we render nothing.
break;
case TAG_A:
case TAG_EMBED:
case TAG_BR:
case TAG_ITUNESHACK:
case TAG_IMG:
case TAG_HR:
// ignore closing tags
break;
}
break;
case xmlpullparser::TEXT:
{
GetLogger().log(LOG_DEBUG,"htmlrenderer::render: found text `%s'",xpp.getText().c_str());
if (itunes_hack) {
std::vector<std::string> words = utils::tokenize_nl(xpp.getText());
for (std::vector<std::string>::iterator it=words.begin();it!=words.end();++it) {
if (*it == "\n") {
lines.push_back(curline);
prepare_newline(curline, indent_level);
} else {
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: tokenizing `%s'", it->c_str());
std::vector<std::string> words2 = utils::tokenize_spaced(*it);
unsigned int i=0;
bool new_line = false;
for (std::vector<std::string>::iterator it2=words2.begin();it2!=words2.end();++it2,++i) {
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: token[%u] = `%s'", i, it2->c_str());
if ((curline.length() + it2->length()) >= w) {
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
new_line = true;
}
if (new_line) {
if (*it2 != " ")
curline.append(*it2);
new_line = false;
} else {
curline.append(*it2);
}
}
}
}
} else if (inside_pre) {
std::vector<std::string> words = utils::tokenize_nl(xpp.getText());
for (std::vector<std::string>::iterator it=words.begin();it!=words.end();++it) {
if (*it == "\n") {
lines.push_back(curline);
prepare_newline(curline, indent_level);
} else {
curline.append(*it);
}
}
} else {
std::string s = xpp.getText();
while (s.length() > 0 && s[0] == '\n')
s.erase(0, 1);
std::vector<std::string> words = utils::tokenize_spaced(s);
//if (!line_is_nonempty(words[0]))
// words.erase(words.begin());
unsigned int i=0;
bool new_line = false;
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: tokenized `%s'", xpp.getText().c_str());
for (std::vector<std::string>::iterator it=words.begin();it!=words.end();++it,++i) {
GetLogger().log(LOG_DEBUG, "htmlrenderer::render: token[%u] = `%s'", i, it->c_str());
if ((curline.length() + it->length()) >= w) {
if (line_is_nonempty(curline))
lines.push_back(curline);
prepare_newline(curline, indent_level);
new_line = true;
}
if (new_line) {
if (*it != " ")
curline.append(*it);
new_line = false;
} else {
curline.append(*it);
}
}
}
}
break;
default:
/* do nothing */
break;
}
}
if (line_is_nonempty(curline))
lines.push_back(curline);
if (links.size() > 0) {
lines.push_back("");
lines.push_back(_("Links: "));
for (unsigned int i=0;i<links.size();++i) {
std::ostringstream line;
line << "[" << (i+1) << "]: " << links[i].first << " (" << type2str(links[i].second) << ")";
lines.push_back(line.str());
}
}
}
std::string htmlrenderer::type2str(link_type type) {
switch (type) {
case LINK_HREF: return _("link");
case LINK_IMG: return _("image");
case LINK_EMBED: return _("embedded flash");
default: return _("unknown (bug)");
}
}
void htmlrenderer::prepare_newline(std::string& line, int indent_level) {
line = "";
for (int i=0;i<indent_level;++i) {
line.append(" ");
}
}
bool htmlrenderer::line_is_nonempty(const std::string& line) {
for (unsigned int i=0;i<line.length();++i) {
if (!isblank(line[i]) && line[i] != '\n' && line[i] && '\r')
return true;
}
return false;
}
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