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Diffstat (limited to 'dviware/dvisvgm/src/Length.cpp')
-rw-r--r-- | dviware/dvisvgm/src/Length.cpp | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/Length.cpp b/dviware/dvisvgm/src/Length.cpp new file mode 100644 index 0000000000..ba7dd2a225 --- /dev/null +++ b/dviware/dvisvgm/src/Length.cpp @@ -0,0 +1,157 @@ +/************************************************************************* +** Length.cpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2019 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 <sstream> +#include "InputReader.hpp" +#include "Length.hpp" + +using namespace std; + +void Length::set (const string &lenstr) { + switch (lenstr.length()) { + case 0: + _pt = 0; + break; + case 1: + if (isdigit(lenstr[0])) + _pt = lenstr[0] - '0'; + else + throw UnitException(string("invalid length: ")+lenstr); + break; + default: + istringstream iss(lenstr); + StreamInputReader ir(iss); + double val; + if (!ir.parseDouble(val)) + throw UnitException(string("invalid length: ")+lenstr); + string unit = ir.getWord(); + set(val, unit); + } +} + + +void Length::set (double val, Unit unit) { + switch (unit) { + case Unit::PT: _pt = val; break; + case Unit::BP: _pt = val/pt2bp; break; + case Unit::IN: _pt = val/pt2in; break; + case Unit::CM: _pt = val/pt2cm; break; + case Unit::MM: _pt = val/pt2mm; break; + case Unit::PC: _pt = val/pt2pc; break; + case Unit::DD: _pt = val/pt2dd; break; + case Unit::CC: _pt = val/pt2cc; break; + case Unit::SP: _pt = val/pt2sp; break; + default: + // this isn't supposed to happen + ostringstream oss; + oss << "invalid length unit: (" << static_cast<int>(unit) << ")"; + throw UnitException(oss.str()); + } +} + + +double Length::get (Unit unit) const { + switch (unit) { + case Unit::PT: return pt(); + case Unit::BP: return bp(); + case Unit::IN: return in(); + case Unit::CM: return cm(); + case Unit::MM: return mm(); + case Unit::PC: return pc(); + case Unit::DD: return dd(); + case Unit::CC: return cc(); + case Unit::SP: return sp(); + } + // this isn't supposed to happen + ostringstream oss; + oss << "invalid length unit: (" << static_cast<int>(unit) << ")"; + throw UnitException(oss.str()); +} + + +string Length::toString (Unit unit) const { + ostringstream oss; + oss << get(unit) << unitToString(unit); + return oss.str(); +} + + +static constexpr int unit_id (int c1, int c2) { + return (c1 << 8) | c2; +} + +Length::Unit Length::stringToUnit (const std::string &unitstr) { + if (unitstr.length() == 2) { + switch (unit_id(unitstr[0], unitstr[1])) { + case unit_id('p','t'): return Unit::PT; + case unit_id('b','p'): return Unit::BP; + case unit_id('i','n'): return Unit::IN; + case unit_id('c','m'): return Unit::CM; + case unit_id('m','m'): return Unit::MM; + case unit_id('p','c'): return Unit::PC; + case unit_id('d','d'): return Unit::DD; + case unit_id('c','c'): return Unit::CC; + case unit_id('s','p'): return Unit::SP; + } + } + throw UnitException(string("invalid length unit: ")+unitstr); +} + + +string Length::unitToString (Unit unit) { + switch (unit) { + case Unit::PT: return "pt"; + case Unit::BP: return "bp"; + case Unit::IN: return "in"; + case Unit::CM: return "cm"; + case Unit::MM: return "mm"; + case Unit::PC: return "pc"; + case Unit::DD: return "dd"; + case Unit::CC: return "cc"; + case Unit::SP: return "sp"; + } + // this isn't supposed to happen + return "??"; +} + + +void Length::set (double val, string unitstr) { + if (unitstr.empty()) + unitstr = "pt"; + else if (unitstr.length() != 2) + throw UnitException(string("invalid length unit: ")+unitstr); + set(val, stringToUnit(unitstr)); +} + + +map<string,Length::Unit> Length::getUnits () { + map<string,Length::Unit> units = { + {"pt", Unit::PT}, + {"bp", Unit::BP}, + {"in", Unit::IN}, + {"cm", Unit::CM}, + {"mm", Unit::MM}, + {"pc", Unit::PC}, + {"dd", Unit::DD}, + {"cc", Unit::CC}, + {"sp", Unit::SP}, + }; + return units; +} |