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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp new file mode 100644 index 00000000000..dc419e8ebb8 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp @@ -0,0 +1,306 @@ +/************************************************************************* +** HtmlSpecialHandler.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** 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 3 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, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#include <config.h> +#include <cassert> +#include <sstream> +#include "HtmlSpecialHandler.h" +#include "InputReader.h" +#include "Message.h" +#include "SVGTree.h" +#include "XMLNode.h" + +using namespace std; + +// variable to select the link marker variant (none, underlined, boxed, or colored background) +HtmlSpecialHandler::MarkerType HtmlSpecialHandler::MARKER_TYPE = HtmlSpecialHandler::MT_LINE; +Color HtmlSpecialHandler::LINK_BGCOLOR; +Color HtmlSpecialHandler::LINK_LINECOLOR; +bool HtmlSpecialHandler::USE_LINECOLOR = false; + + +void HtmlSpecialHandler::preprocess (const char *prefix, istream &is, SpecialActions *actions) { + if (!actions) + return; + _actions = actions; + StreamInputReader ir(is); + ir.skipSpace(); + // collect page number and ID of named anchors + map<string,string> attribs; + if (ir.check("<a ") && ir.parseAttributes(attribs, '"') > 0) { + map<string,string>::iterator it; + if ((it = attribs.find("name")) != attribs.end()) + preprocessNameAnchor(it->second); + else if ((it = attribs.find("href")) != attribs.end()) + preprocessHrefAnchor(it->second); + } +} + + +void HtmlSpecialHandler::preprocessNameAnchor (const string &name) { + NamedAnchors::iterator it = _namedAnchors.find(name); + if (it == _namedAnchors.end()) { // anchor completely undefined? + int id = _namedAnchors.size()+1; + _namedAnchors[name] = NamedAnchor(_actions->getCurrentPageNumber(), id, 0); + } + else if (it->second.id < 0) { // anchor referenced but not defined yet? + it->second.id *= -1; + it->second.pageno = _actions->getCurrentPageNumber(); + } + else + Message::wstream(true) << "named hyperref anchor '" << name << "' redefined\n"; +} + + +void HtmlSpecialHandler::preprocessHrefAnchor (const string &uri) { + if (uri[0] != '#') + return; + string name = uri.substr(1); + NamedAnchors::iterator it = _namedAnchors.find(name); + if (it != _namedAnchors.end()) // anchor already defined? + it->second.referenced = true; + else { + int id = _namedAnchors.size()+1; + _namedAnchors[name] = NamedAnchor(0, -id, 0, true); + } +} + + +bool HtmlSpecialHandler::process (const char *prefix, istream &is, SpecialActions *actions) { + if (!actions) + return true; + _actions = actions; + StreamInputReader ir(is); + ir.skipSpace(); + map<string,string> attribs; + map<string,string>::iterator it; + if (ir.check("<a ") && ir.parseAttributes(attribs, '"') > 0) { + if ((it = attribs.find("href")) != attribs.end()) // <a href="URI"> + processHrefAnchor(it->second); + else if ((it = attribs.find("name")) != attribs.end()) // <a name="ID"> + processNameAnchor(it->second); + else + return false; // none or only invalid attributes + } + else if (ir.check("</a>")) + closeAnchor(); + else if (ir.check("<img src=")) { + } + else if (ir.check("<base ") && ir.parseAttributes(attribs, '"') > 0 && (it = attribs.find("href")) != attribs.end()) + _base = it->second; + return true; +} + + +/** Handles anchors with href attribute: <a href="URI">...</a> + * @param uri value of href attribute */ +void HtmlSpecialHandler::processHrefAnchor (string uri) { + closeAnchor(); + string name; + if (uri[0] == '#') { // reference to named anchor? + name = uri.substr(1); + NamedAnchors::iterator it = _namedAnchors.find(name); + if (it == _namedAnchors.end() || it->second.id < 0) + Message::wstream(true) << "reference to undefined anchor '" << name << "'\n"; + else { + int id = it->second.id; + uri = "#loc"+XMLString(id); + if (_actions->getCurrentPageNumber() != it->second.pageno) { + ostringstream oss; + oss << _actions->getSVGFilename(it->second.pageno) << uri; + uri = oss.str(); + } + } + } + if (!_base.empty() && uri.find("://") != string::npos) { + if (*_base.rbegin() != '/' && uri[0] != '/' && uri[0] != '#') + uri = "/" + uri; + uri = _base + uri; + } + XMLElementNode *anchor = new XMLElementNode("a"); + anchor->addAttribute("xlink:href", uri); + anchor->addAttribute("xlink:title", name.empty() ? uri : name); + _actions->pushContextElement(anchor); + _actions->bbox("{anchor}", true); // start computing the bounding box of the linked area + _depthThreshold = _actions->getDVIStackDepth(); + _anchorType = AT_HREF; +} + + +/** Handles anchors with name attribute: <a name="NAME">...</a> + * @param name value of name attribute */ +void HtmlSpecialHandler::processNameAnchor (const string &name) { + closeAnchor(); + NamedAnchors::iterator it = _namedAnchors.find(name); + assert(it != _namedAnchors.end()); + it->second.pos = _actions->getY(); + _anchorType = AT_NAME; +} + + +/** Handles the closing tag (</a> of the current anchor element. */ +void HtmlSpecialHandler::closeAnchor () { + if (_anchorType == AT_HREF) { + markLinkedBox(); + _actions->popContextElement(); + _depthThreshold = 0; + } + _anchorType = AT_NONE; +} + + +/** Marks a single rectangular area of the linked part of the document with a line or + * a box so that it's noticeable by the user. Additionally, an invisible rectangle is + * placed over this area in order to avoid flickering of the mouse cursor when moving + * it over the hyperlinked area. */ +void HtmlSpecialHandler::markLinkedBox () { + const BoundingBox &bbox = _actions->bbox("{anchor}"); + if (bbox.width() > 0 && bbox.height() > 0) { // does the bounding box extend in both dimensions? + if (MARKER_TYPE != MT_NONE) { + const double linewidth = min(0.5, bbox.height()/15); + XMLElementNode *rect = new XMLElementNode("rect"); + double x = bbox.minX(); + double y = bbox.maxY()+linewidth; + double w = bbox.width(); + double h = linewidth; + const Color &linecolor = USE_LINECOLOR ? LINK_LINECOLOR : _actions->getColor(); + if (MARKER_TYPE == MT_LINE) + rect->addAttribute("fill", linecolor.rgbString()); + else { + x -= linewidth; + y = bbox.minY()-linewidth; + w += 2*linewidth; + h += bbox.height()+linewidth; + if (MARKER_TYPE == MT_BGCOLOR) { + rect->addAttribute("fill", LINK_BGCOLOR.rgbString()); + if (USE_LINECOLOR) { + rect->addAttribute("stroke", linecolor.rgbString()); + rect->addAttribute("stroke-width", linewidth); + } + } + else { // LM_BOX + rect->addAttribute("fill", "none"); + rect->addAttribute("stroke", linecolor.rgbString()); + rect->addAttribute("stroke-width", linewidth); + } + } + rect->addAttribute("x", x); + rect->addAttribute("y", y); + rect->addAttribute("width", w); + rect->addAttribute("height", h); + _actions->prependToPage(rect); + if (MARKER_TYPE == MT_BOX || MARKER_TYPE == MT_BGCOLOR) { + // slightly enlarge the boxed area + x -= linewidth; + y -= linewidth; + w += 2*linewidth; + h += 2*linewidth; + } + _actions->embed(BoundingBox(x, y, x+w, y+h)); + } + // Create an invisible rectangle around the linked area so that it's easier to access. + // This is only necessary when using paths rather than real text elements together with fonts. + if (!SVGTree::USE_FONTS) { + XMLElementNode *rect = new XMLElementNode("rect"); + rect->addAttribute("x", bbox.minX()); + rect->addAttribute("y", bbox.minY()); + rect->addAttribute("width", bbox.width()); + rect->addAttribute("height", bbox.height()); + rect->addAttribute("fill", "white"); + rect->addAttribute("fill-opacity", 0); + _actions->appendToPage(rect); + } + } +} + + +/** This method is called every time the DVI position changes. */ +void HtmlSpecialHandler::dviMovedTo (double x, double y) { + if (_actions && _anchorType != AT_NONE) { + // Start a new box if the current depth of the DVI stack underruns + // the initial threshold which indicates a line break. + if (_actions->getDVIStackDepth() < _depthThreshold) { + markLinkedBox(); + _depthThreshold = _actions->getDVIStackDepth(); + _actions->bbox("{anchor}", true); // start a new box on the new line + } + } +} + + +void HtmlSpecialHandler::dviEndPage (unsigned pageno) { + if (_actions) { + // create views for all collected named anchors defined on the recent page + const BoundingBox &pagebox = _actions->bbox(); + for (NamedAnchors::iterator it=_namedAnchors.begin(); it != _namedAnchors.end(); ++it) { + if (it->second.pageno == pageno && it->second.referenced) { // current anchor referenced? + ostringstream oss; + oss << pagebox.minX() << ' ' << it->second.pos << ' ' + << pagebox.width() << ' ' << pagebox.height(); + XMLElementNode *view = new XMLElementNode("view"); + view->addAttribute("id", "loc"+XMLString(it->second.id)); + view->addAttribute("viewBox", oss.str()); + _actions->appendToDefs(view); + } + } + closeAnchor(); + _actions = 0; + } +} + + +/** Sets the appearance of the link markers. + * @param[in] marker string specifying the marker (format: type[:linecolor]) + * @return true on success */ +bool HtmlSpecialHandler::setLinkMarker (const string &marker) { + string type; // "none", "box", "line", or a background color specifier + string color; // optional line color specifier + size_t seppos = marker.find(":"); + if (seppos == string::npos) + type = marker; + else { + type = marker.substr(0, seppos); + color = marker.substr(seppos+1); + } + if (type.empty() || type == "none") + MARKER_TYPE = MT_NONE; + else if (type == "line") + MARKER_TYPE = MT_LINE; + else if (type == "box") + MARKER_TYPE = MT_BOX; + else { + if (!LINK_BGCOLOR.set(type, false)) + return false; + MARKER_TYPE = MT_BGCOLOR; + } + USE_LINECOLOR = false; + if (MARKER_TYPE != MT_NONE && !color.empty()) { + if (!LINK_LINECOLOR.set(color, false)) + return false; + USE_LINECOLOR = true; + } + return true; +} + + +const char** HtmlSpecialHandler::prefixes () const { + static const char *pfx[] = {"html:", 0}; + return pfx; +} |