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moved expandText() to class SpecialActions
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /************************************************************************* | ||
| ** SpecialActions.cpp ** | ||
| ** ** | ||
| ** This file is part of dvisvgm -- a fast DVI to SVG converter ** | ||
| ** Copyright (C) 2005-2024 Martin Gieseking <[email protected]> ** | ||
| ** ** | ||
| ** 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/>. ** | ||
| *************************************************************************/ | ||
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| #include <cstring> | ||
| #include "Calculator.hpp" | ||
| #include "SpecialActions.hpp" | ||
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| using namespace std; | ||
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| /** 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) { | ||
| bool repl_bbox = true; | ||
| while (repl_bbox) { | ||
| const auto pos = str.find("{?bbox "); | ||
| if (pos == string::npos) | ||
| repl_bbox = false; | ||
| else { | ||
| auto endpos = pos+7; | ||
| while (endpos < str.length() && isalnum(str[endpos])) | ||
| ++endpos; | ||
| if (str[endpos] != '}') | ||
| repl_bbox = false; | ||
| else { | ||
| BoundingBox &box = actions.bbox(str.substr(pos+7, endpos-pos-7)); | ||
| str.replace(pos, endpos-pos+1, box.svgViewBoxString()); | ||
| } | ||
| } | ||
| } | ||
| const struct Constant { | ||
| const char *name; | ||
| string val; | ||
| } constants[] = { | ||
| {"x", XMLString(actions.getX())}, | ||
| {"y", XMLString(actions.getY())}, | ||
| {"color", SVGElement::USE_CURRENTCOLOR && SVGElement::CURRENTCOLOR == actions.getColor() ? "currentColor" : actions.getColor().svgColorString()}, | ||
| {"matrix", actions.getMatrix().toSVG()}, | ||
| {"nl", "\n"}, | ||
| {"pageno", to_string(actions.getCurrentPageNumber())}, | ||
| {"svgfile", actions.getSVGFilePath(actions.getCurrentPageNumber()).relative()}, | ||
| {"svgpath", actions.getSVGFilePath(actions.getCurrentPageNumber()).absolute()}, | ||
| }; | ||
| for (const Constant &constant : constants) { | ||
| const string pattern = string("{?")+constant.name+"}"; | ||
| auto pos = str.find(pattern); | ||
| while (pos != string::npos) { | ||
| str.replace(pos, strlen(constant.name)+3, constant.val); | ||
| pos = str.find(pattern, pos+constant.val.length()); // look for further matches | ||
| } | ||
| } | ||
| } | ||
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| /** Evaluates substrings of the form {?(expr)} where 'expr' is a math expression, | ||
| * and replaces the substring by the computed value. | ||
| * @param[in,out] str string to scan for expressions */ | ||
| static void evaluate_expressions (string &str, const SpecialActions &actions) { | ||
| auto left = str.find("{?("); // start position of expression macro | ||
| while (left != string::npos) { | ||
| auto right = str.find(")}", left+2); // end position of expression macro | ||
| if (right == string::npos) | ||
| break; | ||
| Calculator calc; | ||
| calc.setVariable("x", actions.getX()); | ||
| calc.setVariable("y", actions.getY()); | ||
| string expr = str.substr(left+3, right-left-3); // math expression to evaluate | ||
| if (util::normalize_space(expr).empty()) // no expression given, e.g. {?( )} | ||
| str.erase(left, right-left+2); // => replace with empty string | ||
| else { | ||
| try { | ||
| double val = calc.eval(expr); | ||
| XMLString valstr(val); | ||
| str.replace(left, right-left+2, valstr); | ||
| right = left+valstr.length()-1; | ||
| } | ||
| catch (CalculatorException &e) { | ||
| throw SpecialException(string(e.what())+" in '{?("+expr+")}'"); | ||
| } | ||
| } | ||
| left = str.find("{?(", right+1); // find next expression macro | ||
| } | ||
| } | ||
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| /** Returns a given string with macros and arithmetic expressions expanded. | ||
| * @param[in] text string to be processed | ||
| * @return the expanded text */ | ||
| string SpecialActions::expandText (const string &text) { | ||
| string ret = text; | ||
| evaluate_expressions(ret, *this); | ||
| expand_constants(ret, *this); | ||
| return ret; | ||
| } |
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