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Diffstat (limited to 'starmath/source/mathml/mathmlattr.cxx')
| -rw-r--r-- | starmath/source/mathml/mathmlattr.cxx | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/starmath/source/mathml/mathmlattr.cxx b/starmath/source/mathml/mathmlattr.cxx new file mode 100644 index 000000000..5e54f0d92 --- /dev/null +++ b/starmath/source/mathml/mathmlattr.cxx @@ -0,0 +1,165 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include <mathmlattr.hxx> + +#include <o3tl/safeint.hxx> +#include <o3tl/string_view.hxx> +#include <rtl/math.h> + +#include <cstddef> +#include <string_view> +#include <unordered_map> + +static std::size_t ParseMathMLUnsignedNumber(std::u16string_view rStr, Fraction& rUN) +{ + auto nLen = rStr.length(); + std::size_t nDecimalPoint = std::u16string_view::npos; + std::size_t nIdx; + sal_Int64 nom = 0; + sal_Int64 den = 1; + bool validNomDen = true; + for (nIdx = 0; nIdx < nLen; nIdx++) + { + auto cD = rStr[nIdx]; + if (cD == u'.') + { + if (nDecimalPoint != std::u16string_view::npos) + return std::u16string_view::npos; + nDecimalPoint = nIdx; + continue; + } + if (cD < u'0' || u'9' < cD) + break; + if (validNomDen + && (o3tl::checked_multiply(nom, sal_Int64(10), nom) + || o3tl::checked_add(nom, sal_Int64(cD - u'0'), nom) + || nom >= std::numeric_limits<sal_Int32>::max() + || (nDecimalPoint != std::u16string_view::npos + && o3tl::checked_multiply(den, sal_Int64(10), den)))) + { + validNomDen = false; + } + } + if (nIdx == 0 || (nIdx == 1 && nDecimalPoint == 0)) + return std::u16string_view::npos; + + // If the input "xx.yyy" can be represented with nom = xx*10^n + yyy and den = 10^n in sal_Int64 + // (where n is the length of "yyy"), then use that to create an accurate Fraction (and TODO: we + // could even ignore trailing "0" characters in "yyy", for a smaller n and thus a greater chance + // of validNomDen); if not, use the less accurate approach of creating a Fraction from double: + if (validNomDen) + { + rUN = Fraction(nom, den); + } + else + { + rUN = Fraction( + rtl_math_uStringToDouble(rStr.data(), rStr.data() + nIdx, '.', 0, nullptr, nullptr)); + } + + return nIdx; +} + +static std::size_t ParseMathMLNumber(std::u16string_view rStr, Fraction& rN) +{ + if (rStr.empty()) + return std::u16string_view::npos; + bool bNegative = (rStr[0] == '-'); + std::size_t nOffset = bNegative ? 1 : 0; + auto nIdx = ParseMathMLUnsignedNumber(rStr.substr(nOffset), rN); + if (nIdx == std::u16string_view::npos || !rN.IsValid()) + return std::u16string_view::npos; + if (bNegative) + rN *= -1; + return nOffset + nIdx; +} + +bool ParseMathMLAttributeLengthValue(std::u16string_view rStr, MathMLAttributeLengthValue& rV) +{ + auto nIdx = ParseMathMLNumber(rStr, rV.aNumber); + if (nIdx == std::u16string_view::npos) + return false; + std::u16string_view sRest = rStr.substr(nIdx); + if (sRest.empty()) + { + rV.eUnit = MathMLLengthUnit::None; + } + if (o3tl::starts_with(sRest, u"em")) + { + rV.eUnit = MathMLLengthUnit::Em; + } + if (o3tl::starts_with(sRest, u"ex")) + { + rV.eUnit = MathMLLengthUnit::Ex; + } + if (o3tl::starts_with(sRest, u"px")) + { + rV.eUnit = MathMLLengthUnit::Px; + } + if (o3tl::starts_with(sRest, u"in")) + { + rV.eUnit = MathMLLengthUnit::In; + } + if (o3tl::starts_with(sRest, u"cm")) + { + rV.eUnit = MathMLLengthUnit::Cm; + } + if (o3tl::starts_with(sRest, u"mm")) + { + rV.eUnit = MathMLLengthUnit::Mm; + } + if (o3tl::starts_with(sRest, u"pt")) + { + rV.eUnit = MathMLLengthUnit::Pt; + } + if (o3tl::starts_with(sRest, u"pc")) + { + rV.eUnit = MathMLLengthUnit::Pc; + } + if (sRest[0] == u'%') + { + rV.eUnit = MathMLLengthUnit::Percent; + } + return true; +} + +bool GetMathMLMathvariantValue(const OUString& rStr, MathMLMathvariantValue& rV) +{ + static const std::unordered_map<OUString, MathMLMathvariantValue> aMap{ + { "normal", MathMLMathvariantValue::Normal }, + { "bold", MathMLMathvariantValue::Bold }, + { "italic", MathMLMathvariantValue::Italic }, + { "bold-italic", MathMLMathvariantValue::BoldItalic }, + { "double-struck", MathMLMathvariantValue::DoubleStruck }, + { "bold-fraktur", MathMLMathvariantValue::BoldFraktur }, + { "script", MathMLMathvariantValue::Script }, + { "bold-script", MathMLMathvariantValue::BoldScript }, + { "fraktur", MathMLMathvariantValue::Fraktur }, + { "sans-serif", MathMLMathvariantValue::SansSerif }, + { "bold-sans-serif", MathMLMathvariantValue::BoldSansSerif }, + { "sans-serif-italic", MathMLMathvariantValue::SansSerifItalic }, + { "sans-serif-bold-italic", MathMLMathvariantValue::SansSerifBoldItalic }, + { "monospace", MathMLMathvariantValue::Monospace }, + { "initial", MathMLMathvariantValue::Initial }, + { "tailed", MathMLMathvariantValue::Tailed }, + { "looped", MathMLMathvariantValue::Looped }, + { "stretched", MathMLMathvariantValue::Stretched } + }; + + auto it = aMap.find(rStr); + if (it != aMap.end()) + { + rV = it->second; + return true; + } + return false; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |