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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/DvisvgmSpecialHandler.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/DvisvgmSpecialHandler.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/DvisvgmSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/DvisvgmSpecialHandler.cpp new file mode 100644 index 00000000000..ea9bea79375 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/DvisvgmSpecialHandler.cpp @@ -0,0 +1,202 @@ +/************************************************************************* +** DvisvgmSpecialHandler.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2010 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 <cstring> +#include "DvisvgmSpecialHandler.h" +#include "InputBuffer.h" +#include "InputReader.h" +#include "SpecialActions.h" +#include "XMLNode.h" +#include "XMLString.h" + +using namespace std; + + +/** Replaces constants of the form {?name} by their corresponding value. + * @param[in,out] str text to expand + * @param[in] actions interfcae to the world outside the special handler */ +static void expand_constants (string &str, SpecialActions *actions) { + struct Constant { + const char *name; + string val; + } + constants[] = { + {"x", XMLString(actions->getX())}, + {"y", XMLString(actions->getY())}, + {"color", actions->getColor().rgbString()}, + {"nl", "\n"}, + {0, ""} + }; + bool repl_bbox = true; + while (repl_bbox) { + size_t pos = str.find(string("{?bbox ")); + if (pos == string::npos) + repl_bbox = false; + else { + size_t endpos = pos+7; + while (endpos < str.length() && isalnum(str[endpos])) + ++endpos; + if (str[endpos] == '}') { + BoundingBox &box=actions->bbox(str.substr(pos+7, endpos-pos-7)); + str.replace(pos, endpos-pos+1, box.toSVGViewBox()); + } + else + repl_bbox = false; + } + } + for (const Constant *p=constants; p->name; p++) { + const string pattern = string("{?")+p->name+"}"; + size_t pos = str.find(pattern); + while (pos != string::npos) { + str.replace(pos, strlen(p->name)+3, p->val); + pos = str.find(pattern, pos+p->val.length()); // look for further matches + } + } +} + + +/** Embeds the virtual rectangle (x, y ,w , h) into the current bounding box, + * where (x,y) is the lower left vertex composed of the current DVI position. + * @param[in] w width of the rectangle in TeX point units + * @param[in] h height of the rectangle in TeX point units + * @param[in] d depth of the rectangle in TeX point units */ +static void update_bbox (double w, double h, double d, SpecialActions *actions) { + double x = actions->getX(); + double y = actions->getY(); + actions->embed(BoundingBox(x, y, x+w, y-h)); + actions->embed(BoundingBox(x, y, x+w, y+d)); +} + + +/** Inserts raw text into the SVG tree. + * @param[in,out] in the raw text is read from this input buffer + * @param[in] actions interfcae to the world outside the special handler + * @param[in] group true if the text should be wrapped by a group element */ +static void raw (InputReader &in, SpecialActions *actions, bool group=false) { + string str; + while (!in.eof()) { + char c = in.get(); + if (isprint(c)) + str += c; + } + expand_constants(str, actions); + if (!str.empty()) { + XMLNode *node = new XMLTextNode(str); + if (group) { + XMLElementNode *g = new XMLElementNode("g"); + g->addAttribute("x", actions->getX()); + g->addAttribute("y", actions->getY()); + if (actions->getColor() != Color::BLACK) + g->addAttribute("fill", actions->getColor().rgbString()); + g->append(node); + node = g; + } + actions->appendToPage(node); + } +} + + +/** Evaluates the special dvisvgm:bbox. + * variant 1: dvisvgm:bbox [r[el]] <width> <height> [<depth>] + * variant 2: dvisvgm:bbox a[bs] <x1> <y1> <x2> <y2> + * variant 3: dvisvgm:bbox f[ix] <x1> <y1> <x2> <y2> + * variant 4: dvisvgm:bbox n[ew] <name> */ +static void bbox (InputReader &in, SpecialActions *actions) { + in.skipSpace(); + char c = in.peek(); + if (isalpha(c)) { + while (!isspace(in.peek())) // skip trailing characters + in.get(); + if (c == 'n') { + in.skipSpace(); + string name; + while (isalnum(in.peek())) + name += in.get(); + in.skipSpace(); + if (!name.empty() && in.eof()) + actions->bbox(name, true); // create new user box + } + else if (c == 'a' || c == 'f') { + double p[4]; + for (int i=0; i < 4; i++) + p[i] = in.getDouble(); + BoundingBox b(p[0], p[1], p[2], p[3]); + if (c == 'a') + actions->embed(b); + else { + actions->bbox() = b; + actions->bbox().lock(); + } + } + } + else + c = 'r'; // no mode specifier => relative box parameters + + if (c == 'r') { + double w = in.getDouble(); + double h = in.getDouble(); + double d = in.getDouble(); + update_bbox(w, h, d, actions); + } +} + + +static void img (InputReader &in, SpecialActions *actions) { + double w = in.getDouble(); + double h = in.getDouble(); + string f = in.getString(); + update_bbox(w, h, 0, actions); + XMLElementNode *img = new XMLElementNode("image"); + img->addAttribute("x", actions->getX()); + img->addAttribute("y", actions->getY()); + img->addAttribute("width", w); + img->addAttribute("height", h); + img->addAttribute("xlink:href", f); + if (actions && !actions->getMatrix().isIdentity()) + img->addAttribute("transform", actions->getMatrix().getSVG()); + actions->appendToPage(img); +} + + +/** Evaluates and executes a dvisvgm special statement. + * @param[in] prefix special prefix read by the SpecialManager + * @param[in] is the special statement is read from this stream + * @param[in,out] in the raw text is read from this input buffer */ +bool DvisvgmSpecialHandler::process (const char *prefix, istream &is, SpecialActions *actions) { + if (actions) { + StreamInputBuffer ib(is); + BufferInputReader in(ib); + string cmd = in.getWord(); + if (cmd == "raw") // raw <text> + raw(in, actions); + else if (cmd == "bbox") // bbox [r] <width> <height> <depth> or bbox a <x1> <y1> <x2> <y2> + bbox(in, actions); + else if (cmd == "img") { // img <width> <height> <file> + img(in, actions); + } + } + return true; +} + + +const char** DvisvgmSpecialHandler::prefixes () const { + static const char *pfx[] = {"dvisvgm:", 0}; + return pfx; +} |