Java JSType类代码示例

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.8.2.11 max(x)
 *
 * @param self  self reference
 * @param args  arguments
 *
 * @return the largest of the arguments, {@link Double#NEGATIVE_INFINITY} if no args given, or identity if one arg is given
 */
@Function(arity = 2, attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static double max(final Object self, final Object... args) {
    switch (args.length) {
    case 0:
        return Double.NEGATIVE_INFINITY;
    case 1:
        return JSType.toNumber(args[0]);
    default:
        double res = JSType.toNumber(args[0]);
        for (int i = 1; i < args.length; i++) {
            res = Math.max(res, JSType.toNumber(args[i]));
        }
        return res;
    }
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * Test of toString method, of class Runtime.
 */
@Test
public void testToString_Object() {
    assertEquals(JSType.toString(ScriptRuntime.UNDEFINED), "undefined");
    assertEquals(JSType.toString(null), "null");
    assertEquals(JSType.toString(Boolean.TRUE), "true");
    assertEquals(JSType.toString(Boolean.FALSE), "false");
    assertEquals(JSType.toString(""), "");
    assertEquals(JSType.toString("nashorn"), "nashorn");
    assertEquals(JSType.toString(Double.NaN), "NaN");
    assertEquals(JSType.toString(Double.POSITIVE_INFINITY), "Infinity");
    assertEquals(JSType.toString(Double.NEGATIVE_INFINITY), "-Infinity");
    assertEquals(JSType.toString(0.0), "0");
    // FIXME: add more number-to-string test cases
    // FIXME: add case for Object type (JSObject with getDefaultValue)
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.4.4.5 Array.prototype.join (separator)
 *
 * @param self      self reference
 * @param separator element separator
 * @return string representation after join
 */
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static String join(final Object self, final Object separator) {
    final StringBuilder    sb   = new StringBuilder();
    final Iterator<Object> iter = arrayLikeIterator(self, true);
    final String           sep  = separator == ScriptRuntime.UNDEFINED ? "," : JSType.toString(separator);

    while (iter.hasNext()) {
        final Object obj = iter.next();

        if (obj != null && obj != ScriptRuntime.UNDEFINED) {
            sb.append(JSType.toString(obj));
        }

        if (iter.hasNext()) {
            sb.append(sep);
        }
    }

    return sb.toString();
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.2.4.3 Object.prototype.toLocaleString ( )
 *
 * @param self self reference
 * @return localized ToString
 */
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object toLocaleString(final Object self) {
    final Object obj = JSType.toScriptObject(self);
    if (obj instanceof ScriptObject) {
        final InvokeByName toStringInvoker = getTO_STRING();
        final ScriptObject sobj = (ScriptObject)obj;
        try {
            final Object toString = toStringInvoker.getGetter().invokeExact(sobj);

            if (Bootstrap.isCallable(toString)) {
                return toStringInvoker.getInvoker().invokeExact(toString, sobj);
            }
        } catch (final RuntimeException | Error e) {
            throw e;
        } catch (final Throwable t) {
            throw new RuntimeException(t);
        }

        throw typeError("not.a.function", "toString");
    }

    return ScriptRuntime.builtinObjectToString(self);
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.5.4.14 String.prototype.split (separator, limit)
 *
 * @param self      self reference
 * @param separator separator for split
 * @param limit     limit for splits
 * @return array object in which splits have been placed
 */
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static ScriptObject split(final Object self, final Object separator, final Object limit) {
    final String str = checkObjectToString(self);
    final long lim = limit == UNDEFINED ? JSType.MAX_UINT : JSType.toUint32(limit);

    if (separator == UNDEFINED) {
        return lim == 0 ? new NativeArray() : new NativeArray(new Object[]{str});
    }

    if (separator instanceof NativeRegExp) {
        return ((NativeRegExp) separator).split(str, lim);
    }

    // when separator is a string, it is treated as a literal search string to be used for splitting.
    return splitString(str, JSType.toString(separator), lim);
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.4.4.7 Array.prototype.push (args...) specialized for single object argument
 *
 * @param self self reference
 * @param arg argument to push
 * @return array after pushes
 */
@SpecializedFunction
public static double push(final Object self, final Object arg) {
    try {
        final ScriptObject sobj = (ScriptObject)self;
        final ArrayData arrayData = sobj.getArray();
        final long length = arrayData.length();
        if (bulkable(sobj) && length < JSType.MAX_UINT) {
            sobj.setArray(arrayData.push(true, arg));
            return length + 1;
        }

        long len = JSType.toUint32(sobj.getLength());
        sobj.set(len++, arg, CALLSITE_STRICT);
        sobj.set("length", len, CALLSITE_STRICT);
        return len;
    } catch (final ClassCastException | NullPointerException e) {
        throw typeError("not.an.object", ScriptRuntime.safeToString(self));
    }
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
@Override
public PropertyDescriptor fillFrom(final ScriptObject sobj) {
    if (sobj.has(CONFIGURABLE)) {
        this.configurable = JSType.toBoolean(sobj.get(CONFIGURABLE));
    } else {
        delete(CONFIGURABLE, false);
    }

    if (sobj.has(ENUMERABLE)) {
        this.enumerable = JSType.toBoolean(sobj.get(ENUMERABLE));
    } else {
        delete(ENUMERABLE, false);
    }

    return this;
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.8.2.12 min(x)
 *
 * @param self  self reference
 * @param args  arguments
 *
 * @return the smallest of the arguments, {@link Double#NEGATIVE_INFINITY} if no args given, or identity if one arg is given
 */
@Function(arity = 2, attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static double min(final Object self, final Object... args) {
    switch (args.length) {
    case 0:
        return Double.POSITIVE_INFINITY;
    case 1:
        return JSType.toNumber(args[0]);
    default:
        double res = JSType.toNumber(args[0]);
        for (int i = 1; i < args.length; i++) {
            res = Math.min(res, JSType.toNumber(args[i]));
        }
        return res;
    }
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
private static double[] convertCtorArgs(final Object[] args) {
    final double[] d = new double[7];
    boolean nullReturn = false;

    // should not bailout on first NaN or infinite. Need to convert all
    // subsequent args for possible side-effects via valueOf/toString overrides
    // on argument objects.
    for (int i = 0; i < d.length; i++) {
        if (i < args.length) {
            final double darg = JSType.toNumber(args[i]);
            if (isNaN(darg) || isInfinite(darg)) {
                nullReturn = true;
            }

            d[i] = (long)darg;
        } else {
            d[i] = i == 2 ? 1 : 0; // day in month defaults to 1
        }
    }

    if (0 <= d[0] && d[0] <= 99) {
        d[0] += 1900;
    }

    return nullReturn? null : d;
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
@Override
public double toNumber() {
    return inGlobal(new Callable<Double>() {
        @Override public Double call() {
            return JSType.toNumber(sobj);
        }
    });
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
@SuppressWarnings("unused")
private static Object get(final Object self, final Object key) {
    final CharSequence cs = JSType.toCharSequence(self);
    final Object primitiveKey = JSType.toPrimitive(key, String.class);
    final int index = ArrayIndex.getArrayIndex(primitiveKey);
    if (index >= 0 && index < cs.length()) {
        return String.valueOf(cs.charAt(index));
    }
    return ((ScriptObject) Global.toObject(self)).get(primitiveKey);
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * Converts {@code result} to a printable string. The reason we don't use {@link JSType#toString(Object)}
 * or {@link ScriptRuntime#safeToString(Object)} is that we want to be able to render Symbol values
 * even if they occur within an Array, and therefore have to implement our own Array to String
 * conversion.
 *
 * @param result the result
 * @param global the global object
 * @return the string representation
 */
protected static String toString(final Object result, final Global global) {
    if (result instanceof Symbol) {
        // Normal implicit conversion of symbol to string would throw TypeError
        return result.toString();
    }

    if (result instanceof NativeSymbol) {
        return JSType.toPrimitive(result).toString();
    }

    if (isArrayWithDefaultToString(result, global)) {
        // This should yield the same string as Array.prototype.toString but
        // will not throw if the array contents include symbols.
        final StringBuilder sb = new StringBuilder();
        final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(result, true);

        while (iter.hasNext()) {
            final Object obj = iter.next();

            if (obj != null && obj != ScriptRuntime.UNDEFINED) {
                sb.append(toString(obj, global));
            }

            if (iter.hasNext()) {
                sb.append(',');
            }
        }

        return sb.toString();
    }

    return JSType.toString(result);
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
@Override
public int getIntOptimistic(final int index, final int programPoint) {
    if (index >= length()) {
        return JSType.toInt32Optimistic(get(index), programPoint);
    }
    return underlying.getIntOptimistic(index, programPoint);
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
@Override
public PropertyDescriptor fillFrom(final ScriptObject sobj) {
    if (sobj.has(CONFIGURABLE)) {
        this.configurable = JSType.toBoolean(sobj.get(CONFIGURABLE));
    } else {
        delete(CONFIGURABLE, false);
    }

    if (sobj.has(ENUMERABLE)) {
        this.enumerable = JSType.toBoolean(sobj.get(ENUMERABLE));
    } else {
        delete(ENUMERABLE, false);
    }

    if (sobj.has(WRITABLE)) {
        this.writable = JSType.toBoolean(sobj.get(WRITABLE));
    } else {
        delete(WRITABLE, false);
    }

    if (sobj.has(VALUE)) {
        this.value = sobj.get(VALUE);
    } else {
        delete(VALUE, false);
    }

    return this;
}
 

import jdk.nashorn.internal.runtime.JSType; //导入依赖的package包/类
/**
 * ECMA 15.2.4.5 Object.prototype.hasOwnProperty (V)
 *
 * @param self self reference
 * @param v property to check for
 * @return true if property exists in object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static boolean hasOwnProperty(final Object self, final Object v) {
    // Convert ScriptObjects to primitive with String.class hint
    // but no need to convert other primitives to string.
    final Object key = JSType.toPrimitive(v, String.class);
    final Object obj = Global.toObject(self);

    return obj instanceof ScriptObject && ((ScriptObject)obj).hasOwnProperty(key);
}