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Diffstat (limited to 'src/qml/jsruntime/qv4mathobject.cpp')
| -rw-r--r-- | src/qml/jsruntime/qv4mathobject.cpp | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4mathobject.cpp b/src/qml/jsruntime/qv4mathobject.cpp new file mode 100644 index 0000000000..7aa56f51bd --- /dev/null +++ b/src/qml/jsruntime/qv4mathobject.cpp @@ -0,0 +1,311 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qv4mathobject_p.h" +#include "qv4objectproto_p.h" + +#include <cmath> +#include <qmath.h> +#include <qnumeric.h> + +using namespace QV4; + +static const double qt_PI = 2.0 * ::asin(1.0); + +MathObject::MathObject(ExecutionContext *ctx) + : Object(ctx->engine) +{ + type = Type_MathObject; + prototype = ctx->engine->objectPrototype; + + defineReadonlyProperty(ctx->engine, QStringLiteral("E"), Value::fromDouble(::exp(1.0))); + defineReadonlyProperty(ctx->engine, QStringLiteral("LN2"), Value::fromDouble(::log(2.0))); + defineReadonlyProperty(ctx->engine, QStringLiteral("LN10"), Value::fromDouble(::log(10.0))); + defineReadonlyProperty(ctx->engine, QStringLiteral("LOG2E"), Value::fromDouble(1.0/::log(2.0))); + defineReadonlyProperty(ctx->engine, QStringLiteral("LOG10E"), Value::fromDouble(1.0/::log(10.0))); + defineReadonlyProperty(ctx->engine, QStringLiteral("PI"), Value::fromDouble(qt_PI)); + defineReadonlyProperty(ctx->engine, QStringLiteral("SQRT1_2"), Value::fromDouble(::sqrt(0.5))); + defineReadonlyProperty(ctx->engine, QStringLiteral("SQRT2"), Value::fromDouble(::sqrt(2.0))); + + defineDefaultProperty(ctx, QStringLiteral("abs"), method_abs, 1); + defineDefaultProperty(ctx, QStringLiteral("acos"), method_acos, 1); + defineDefaultProperty(ctx, QStringLiteral("asin"), method_asin, 0); + defineDefaultProperty(ctx, QStringLiteral("atan"), method_atan, 1); + defineDefaultProperty(ctx, QStringLiteral("atan2"), method_atan2, 2); + defineDefaultProperty(ctx, QStringLiteral("ceil"), method_ceil, 1); + defineDefaultProperty(ctx, QStringLiteral("cos"), method_cos, 1); + defineDefaultProperty(ctx, QStringLiteral("exp"), method_exp, 1); + defineDefaultProperty(ctx, QStringLiteral("floor"), method_floor, 1); + defineDefaultProperty(ctx, QStringLiteral("log"), method_log, 1); + defineDefaultProperty(ctx, QStringLiteral("max"), method_max, 2); + defineDefaultProperty(ctx, QStringLiteral("min"), method_min, 2); + defineDefaultProperty(ctx, QStringLiteral("pow"), method_pow, 2); + defineDefaultProperty(ctx, QStringLiteral("random"), method_random, 0); + defineDefaultProperty(ctx, QStringLiteral("round"), method_round, 1); + defineDefaultProperty(ctx, QStringLiteral("sin"), method_sin, 1); + defineDefaultProperty(ctx, QStringLiteral("sqrt"), method_sqrt, 1); + defineDefaultProperty(ctx, QStringLiteral("tan"), method_tan, 1); +} + +/* copies the sign from y to x and returns the result */ +static double copySign(double x, double y) +{ + uchar *xch = (uchar *)&x; + uchar *ych = (uchar *)&y; + if (QSysInfo::ByteOrder == QSysInfo::BigEndian) + xch[0] = (xch[0] & 0x7f) | (ych[0] & 0x80); + else + xch[7] = (xch[7] & 0x7f) | (ych[7] & 0x80); + return x; +} + +Value MathObject::method_abs(SimpleCallContext *context) +{ + if (!context->argumentCount) + return Value::fromDouble(qSNaN()); + + if (context->arguments[0].isInteger()) { + int i = context->arguments[0].integerValue(); + return Value::fromInt32(i < 0 ? - i : i); + } + + double v = context->arguments[0].toNumber(); + if (v == 0) // 0 | -0 + return Value::fromDouble(0); + + return Value::fromDouble(v < 0 ? -v : v); +} + +Value MathObject::method_acos(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : 2; + if (v > 1) + return Value::fromDouble(qSNaN()); + + return Value::fromDouble(::acos(v)); +} + +Value MathObject::method_asin(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : 2; + if (v > 1) + return Value::fromDouble(qSNaN()); + else + return Value::fromDouble(::asin(v)); +} + +Value MathObject::method_atan(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + if (v == 0.0) + return Value::fromDouble(v); + else + return Value::fromDouble(::atan(v)); +} + +Value MathObject::method_atan2(SimpleCallContext *context) +{ + double v1 = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + double v2 = context->argumentCount > 1 ? context->arguments[1].toNumber() : qSNaN(); + + if ((v1 < 0) && qIsFinite(v1) && qIsInf(v2) && (copySign(1.0, v2) == 1.0)) + return Value::fromDouble(copySign(0, -1.0)); + + if ((v1 == 0.0) && (v2 == 0.0)) { + if ((copySign(1.0, v1) == 1.0) && (copySign(1.0, v2) == -1.0)) { + return Value::fromDouble(qt_PI); + } else if ((copySign(1.0, v1) == -1.0) && (copySign(1.0, v2) == -1.0)) { + return Value::fromDouble(-qt_PI); + } + } + return Value::fromDouble(::atan2(v1, v2)); +} + +Value MathObject::method_ceil(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + if (v < 0.0 && v > -1.0) + return Value::fromDouble(copySign(0, -1.0)); + else + return Value::fromDouble(::ceil(v)); +} + +Value MathObject::method_cos(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + return Value::fromDouble(::cos(v)); +} + +Value MathObject::method_exp(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + if (qIsInf(v)) { + if (copySign(1.0, v) == -1.0) + return Value::fromDouble(0); + else + return Value::fromDouble(qInf()); + } else { + return Value::fromDouble(::exp(v)); + } +} + +Value MathObject::method_floor(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + return Value::fromDouble(::floor(v)); +} + +Value MathObject::method_log(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + if (v < 0) + return Value::fromDouble(qSNaN()); + else + return Value::fromDouble(::log(v)); +} + +Value MathObject::method_max(SimpleCallContext *context) +{ + double mx = -qInf(); + for (unsigned i = 0; i < context->argumentCount; ++i) { + double x = context->arguments[i].toNumber(); + if (x > mx || std::isnan(x)) + mx = x; + } + return Value::fromDouble(mx); +} + +Value MathObject::method_min(SimpleCallContext *context) +{ + double mx = qInf(); + for (unsigned i = 0; i < context->argumentCount; ++i) { + double x = context->arguments[i].toNumber(); + if ((x == 0 && mx == x && copySign(1.0, x) == -1.0) + || (x < mx) || std::isnan(x)) { + mx = x; + } + } + return Value::fromDouble(mx); +} + +Value MathObject::method_pow(SimpleCallContext *context) +{ + double x = context->argumentCount > 0 ? context->arguments[0].toNumber() : qSNaN(); + double y = context->argumentCount > 1 ? context->arguments[1].toNumber() : qSNaN(); + + if (std::isnan(y)) + return Value::fromDouble(qSNaN()); + + if (y == 0) { + return Value::fromDouble(1); + } else if (((x == 1) || (x == -1)) && std::isinf(y)) { + return Value::fromDouble(qSNaN()); + } else if (((x == 0) && copySign(1.0, x) == 1.0) && (y < 0)) { + return Value::fromDouble(qInf()); + } else if ((x == 0) && copySign(1.0, x) == -1.0) { + if (y < 0) { + if (::fmod(-y, 2.0) == 1.0) + return Value::fromDouble(-qInf()); + else + return Value::fromDouble(qInf()); + } else if (y > 0) { + if (::fmod(y, 2.0) == 1.0) + return Value::fromDouble(copySign(0, -1.0)); + else + return Value::fromDouble(0); + } + } + +#ifdef Q_OS_AIX + else if (qIsInf(x) && copySign(1.0, x) == -1.0) { + if (y > 0) { + if (::fmod(y, 2.0) == 1.0) + return Value::fromDouble(-qInf()); + else + return Value::fromDouble(qInf()); + } else if (y < 0) { + if (::fmod(-y, 2.0) == 1.0) + return Value::fromDouble(copySign(0, -1.0)); + else + return Value::fromDouble(0); + } + } +#endif + else { + return Value::fromDouble(::pow(x, y)); + } + // ### + return Value::fromDouble(qSNaN()); +} + +Value MathObject::method_random(SimpleCallContext *) +{ + return Value::fromDouble(qrand() / (double) RAND_MAX); +} + +Value MathObject::method_round(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + v = copySign(::floor(v + 0.5), v); + return Value::fromDouble(v); +} + +Value MathObject::method_sin(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + return Value::fromDouble(::sin(v)); +} + +Value MathObject::method_sqrt(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + return Value::fromDouble(::sqrt(v)); +} + +Value MathObject::method_tan(SimpleCallContext *context) +{ + double v = context->argumentCount ? context->arguments[0].toNumber() : qSNaN(); + if (v == 0.0) + return Value::fromDouble(v); + else + return Value::fromDouble(::tan(v)); +} + |