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A PHP engine implemented in 100% Java
/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.quercus.env;
import com.caucho.quercus.marshal.Marshal;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Serializable;
import java.util.IdentityHashMap;
import java.util.Locale;
/**
* Represents a PHP double value.
*/
public class DoubleValue extends NumberValue
implements Serializable
{
public static final DoubleValue ZERO = new DoubleValue(0);
private final double _value;
public DoubleValue(double value)
{
_value = value;
}
public static DoubleValue create(double value)
{
return new DoubleValue(value);
}
public static Value create(Number value)
{
if (value == null) {
// php/3c2d
return NullValue.NULL;
}
else
return new DoubleValue(value.doubleValue());
}
/**
* Returns the type.
*/
public String getType()
{
// php/0142
return "double";
}
/**
* Returns the ValueType.
*/
@Override
public ValueType getValueType()
{
return ValueType.DOUBLE;
}
/**
* Returns true for a double.
*/
public boolean isDoubleConvertible()
{
return true;
}
/**
* Returns true for integer looking doubles.
*/
public boolean isLongConvertible()
{
return _value == (double)((long) _value);
}
/**
* Returns true for a long-value.
*/
@Override
public boolean isLong()
{
return false;
}
/**
* Returns true for a double-value.
*/
@Override
public boolean isDouble()
{
return true;
}
/**
* Returns true for is_numeric
*/
@Override
public boolean isNumeric()
{
return true;
}
/**
* Returns true for a scalar
*/
public boolean isScalar()
{
return true;
}
//
// marshal cost
//
/**
* Cost to convert to a double
*/
@Override
public int toDoubleMarshalCost()
{
return Marshal.COST_EQUAL;
}
/**
* Cost to convert to a long
*/
@Override
public int toLongMarshalCost()
{
return Marshal.COST_NUMERIC_LOSSY;
}
/**
* Cost to convert to an integer
*/
@Override
public int toIntegerMarshalCost()
{
return Marshal.COST_NUMERIC_LOSSY;
}
/**
* Cost to convert to a short
*/
@Override
public int toShortMarshalCost()
{
return Marshal.COST_NUMERIC_LOSSY;
}
/**
* Cost to convert to a byte
*/
@Override
public int toByteMarshalCost()
{
return Marshal.COST_NUMERIC_LOSSY;
}
//
// conversions
//
/**
* Converts to a boolean.
*/
public boolean toBoolean()
{
return _value != 0;
}
/**
* Converts to a long.
*/
public long toLong()
{
if ((_value > (double) Long.MAX_VALUE)
|| (_value < (double) Long.MIN_VALUE)) {
return 0;
} else {
return (long) _value;
}
}
/**
* Converts to a double.
*/
public double toDouble()
{
return _value;
}
/**
* Converts to a double.
*/
public DoubleValue toDoubleValue()
{
return this;
}
/**
* Converts to a string builder
*/
@Override
public StringValue toStringBuilder(Env env)
{
return env.createUnicodeBuilder().append(toString());
}
/**
* Converts to a key.
*/
public Value toKey()
{
return LongValue.create((long) _value);
}
/**
* Converts to a java object.
*/
public Object toJavaObject()
{
return new Double(_value);
}
/**
* Negates the value.
*/
public Value neg()
{
return new DoubleValue(- _value);
}
/**
* Returns the value
*/
public Value pos()
{
return this;
}
/**
* Multiplies to the following value.
*/
public Value add(Value rValue)
{
return new DoubleValue(_value + rValue.toDouble());
}
/**
* Multiplies to the following value.
*/
public Value add(long lValue)
{
return new DoubleValue(lValue + _value);
}
/**
* Increment the following value.
*/
@Override
public Value addOne()
{
return new DoubleValue(_value + 1);
}
/**
* Increment the following value.
*/
@Override
public Value subOne()
{
double next = _value - 1;
/*
if (next == (long) next)
return LongValue.create(next);
else
*/
return new DoubleValue(next);
}
/**
* Increment the following value.
*/
@Override
public Value preincr()
{
return new DoubleValue(_value + 1);
}
/**
* Increment the following value.
*/
@Override
public Value predecr()
{
return new DoubleValue(_value - 1);
}
/**
* Increment the following value.
*/
@Override
public Value postincr()
{
return new DoubleValue(_value + 1);
}
/**
* Increment the following value.
*/
@Override
public Value postdecr()
{
return new DoubleValue(_value - 1);
}
/**
* Increment the following value.
*/
public Value increment(int incr)
{
return new DoubleValue(_value + incr);
}
/**
* Multiplies to the following value.
*/
public Value mul(Value rValue)
{
return new DoubleValue(_value * rValue.toDouble());
}
/**
* Multiplies to the following value.
*/
public Value mul(long lValue)
{
return new DoubleValue(lValue * _value);
}
/**
* Absolute value.
*/
public Value abs()
{
if (_value >= 0)
return this;
else
return DoubleValue.create(- _value);
}
/**
* Returns true for equality
*/
public boolean eql(Value rValue)
{
rValue = rValue.toValue();
if (! (rValue instanceof DoubleValue))
return false;
double rDouble = ((DoubleValue) rValue)._value;
return _value == rDouble;
}
/**
* Converts to a string.
*/
@Override
public String toString()
{
// XXX: pass in Env
Env env = Env.getInstance();
if (env != null) {
return toString(env.getLocaleInfo().getNumeric());
}
else {
return toString(LocaleInfo.getDefault().getNumeric());
}
}
/**
* Converts to a string.
*
* @param env
*/
public StringValue toString(Env env)
{
String str = toString(env.getLocaleInfo().getNumeric());
return env.createStringBuilder().append(str);
}
/**
* Converts to a string.
*/
public String toString(QuercusLocale quercusLocale)
{
long longValue = (long) _value;
double abs = _value < 0 ? - _value : _value;
int exp = (int) Math.log10(abs);
// php/0c02
if (longValue == _value && exp < 18) {
return String.valueOf(longValue);
}
Locale locale = quercusLocale.getLocale();
if (-5 < exp && exp < 18) {
char decimalSeparator = quercusLocale.getDecimalSeparator();
int digits = 13 - exp;
if (digits > 13)
digits = 13;
else if (digits < 0)
digits = 0;
String v = String.format(locale, "%." + digits + "f", _value);
int len = v.length();
int nonzero = -1;
boolean dot = false;
for (len--; len >= 0; len--) {
int ch = v.charAt(len);
if (ch == decimalSeparator)
dot = true;
if (ch != '0' && nonzero < 0) {
if (ch == decimalSeparator)
nonzero = len - 1;
else
nonzero = len;
}
}
if (dot && nonzero >= 0)
return v.substring(0, nonzero + 1);
else
return v;
}
else {
return String.format(locale, "%.13E", _value);
}
}
/**
* Converts to an object.
*/
public Object toObject()
{
return toString();
}
/**
* Prints the value.
* @param env
*/
public void print(Env env)
{
env.print(toString());
}
/**
* Serializes the value.
*/
public void serialize(Env env, StringBuilder sb)
{
sb.append("d:");
sb.append(_value);
sb.append(";");
}
/**
* Exports the value.
*/
@Override
protected void varExportImpl(StringValue sb, int level)
{
sb.append(toString());
}
//
// Java generator code
//
/**
* Generates code to recreate the expression.
*
* @param out the writer to the Java source code.
*/
@Override
public void generate(PrintWriter out)
throws IOException
{
if (_value == 0)
out.print("DoubleValue.ZERO");
else if (_value == Double.POSITIVE_INFINITY)
out.print("new DoubleValue(Double.POSITIVE_INFINITY)");
else if (_value == Double.NEGATIVE_INFINITY)
out.print("new DoubleValue(Double.NEGATIVE_INFINITY)");
else
out.print("new DoubleValue(" + _value + ")");
}
/**
* Returns the hash code
*/
@Override
public int hashCode()
{
return (int) (37 + 65521 * _value);
}
/**
* Compare for equality.
*/
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
else if (! (o instanceof DoubleValue))
return false;
DoubleValue value = (DoubleValue) o;
return _value == value._value;
}
@Override
public void varDumpImpl(Env env,
WriteStream out,
int depth,
IdentityHashMap valueSet)
throws IOException
{
out.print("float(" + toString() + ")");
}
//
// Java Serialization
//
private Object readResolve()
{
if (_value == 0)
return ZERO;
else
return this;
}
}