| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.runtime; |
| |
| import static jdk.nashorn.internal.codegen.CompilerConstants.staticCall; |
| import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.reflect.Array; |
| import java.util.Deque; |
| import java.util.List; |
| import jdk.internal.dynalink.beans.StaticClass; |
| import jdk.nashorn.api.scripting.JSObject; |
| import jdk.nashorn.internal.codegen.CompilerConstants.Call; |
| import jdk.nashorn.internal.parser.Lexer; |
| import jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator; |
| import jdk.nashorn.internal.runtime.linker.Bootstrap; |
| |
| /** |
| * Representation for ECMAScript types - this maps directly to the ECMA script standard |
| */ |
| public enum JSType { |
| /** The undefined type */ |
| UNDEFINED("undefined"), |
| |
| /** The null type */ |
| NULL("object"), |
| |
| /** The boolean type */ |
| BOOLEAN("boolean"), |
| |
| /** The number type */ |
| NUMBER("number"), |
| |
| /** The string type */ |
| STRING("string"), |
| |
| /** The object type */ |
| OBJECT("object"), |
| |
| /** The function type */ |
| FUNCTION("function"); |
| |
| /** The type name as returned by ECMAScript "typeof" operator*/ |
| private final String typeName; |
| |
| /** Max value for an uint32 in JavaScript */ |
| public static final long MAX_UINT = 0xFFFF_FFFFL; |
| |
| private static final MethodHandles.Lookup myLookup = MethodHandles.lookup(); |
| |
| /** JavaScript compliant conversion function from Object to boolean */ |
| public static final Call TO_BOOLEAN = staticCall(myLookup, JSType.class, "toBoolean", boolean.class, Object.class); |
| |
| /** JavaScript compliant conversion function from number to boolean */ |
| public static final Call TO_BOOLEAN_D = staticCall(myLookup, JSType.class, "toBoolean", boolean.class, double.class); |
| |
| /** JavaScript compliant conversion function from Object to integer */ |
| public static final Call TO_INTEGER = staticCall(myLookup, JSType.class, "toInteger", int.class, Object.class); |
| |
| /** JavaScript compliant conversion function from Object to long */ |
| public static final Call TO_LONG = staticCall(myLookup, JSType.class, "toLong", long.class, Object.class); |
| |
| /** JavaScript compliant conversion function from Object to number */ |
| public static final Call TO_NUMBER = staticCall(myLookup, JSType.class, "toNumber", double.class, Object.class); |
| |
| /** JavaScript compliant conversion function from Object to int32 */ |
| public static final Call TO_INT32 = staticCall(myLookup, JSType.class, "toInt32", int.class, Object.class); |
| |
| /** JavaScript compliant conversion function from double to int32 */ |
| public static final Call TO_INT32_D = staticCall(myLookup, JSType.class, "toInt32", int.class, double.class); |
| |
| /** JavaScript compliant conversion function from Object to uint32 */ |
| public static final Call TO_UINT32 = staticCall(myLookup, JSType.class, "toUint32", long.class, Object.class); |
| |
| /** JavaScript compliant conversion function from number to uint32 */ |
| public static final Call TO_UINT32_D = staticCall(myLookup, JSType.class, "toUint32", long.class, double.class); |
| |
| /** JavaScript compliant conversion function from Object to int64 */ |
| public static final Call TO_INT64 = staticCall(myLookup, JSType.class, "toInt64", long.class, Object.class); |
| |
| /** JavaScript compliant conversion function from number to int64 */ |
| public static final Call TO_INT64_D = staticCall(myLookup, JSType.class, "toInt64", long.class, double.class); |
| |
| /** JavaScript compliant conversion function from number to String */ |
| public static final Call TO_STRING_D = staticCall(myLookup, JSType.class, "toString", String.class, double.class); |
| |
| /** Combined call to toPrimitive followed by toString. */ |
| public static final Call TO_PRIMITIVE_TO_STRING = staticCall(myLookup, JSType.class, "toPrimitiveToString", String.class, Object.class); |
| |
| /** Method handle to convert a JS Object to a Java array. */ |
| public static final Call TO_JAVA_ARRAY = staticCall(myLookup, JSType.class, "toJavaArray", Object.class, Object.class, Class.class); |
| |
| /** Method handle to convert a JS Object to a Java List. */ |
| public static final Call TO_JAVA_LIST = staticCall(myLookup, JSType.class, "toJavaList", List.class, Object.class); |
| |
| /** Method handle to convert a JS Object to a Java deque. */ |
| public static final Call TO_JAVA_DEQUE = staticCall(myLookup, JSType.class, "toJavaDeque", Deque.class, Object.class); |
| |
| private static final double INT32_LIMIT = 4294967296.0; |
| |
| /** |
| * Constructor |
| * |
| * @param typeName the type name |
| */ |
| private JSType(final String typeName) { |
| this.typeName = typeName; |
| } |
| |
| /** |
| * The external type name as returned by ECMAScript "typeof" operator |
| * |
| * @return type name for this type |
| */ |
| public final String typeName() { |
| return this.typeName; |
| } |
| |
| /** |
| * Return the JSType for a given object |
| * |
| * @param obj an object |
| * |
| * @return the JSType for the object |
| */ |
| public static JSType of(final Object obj) { |
| // Order of these statements is tuned for performance (see JDK-8024476) |
| if (obj == null) { |
| return JSType.NULL; |
| } |
| |
| if (obj instanceof ScriptObject) { |
| return (obj instanceof ScriptFunction) ? JSType.FUNCTION : JSType.OBJECT; |
| } |
| |
| if (obj instanceof Boolean) { |
| return JSType.BOOLEAN; |
| } |
| |
| if (obj instanceof String || obj instanceof ConsString) { |
| return JSType.STRING; |
| } |
| |
| if (obj instanceof Number) { |
| return JSType.NUMBER; |
| } |
| |
| if (obj == ScriptRuntime.UNDEFINED) { |
| return JSType.UNDEFINED; |
| } |
| |
| return Bootstrap.isCallable(obj) ? JSType.FUNCTION : JSType.OBJECT; |
| } |
| |
| /** |
| * Returns true if double number can be represented as an int |
| * |
| * @param number a long to inspect |
| * |
| * @return true for int representable longs |
| */ |
| public static boolean isRepresentableAsInt(final long number) { |
| return (int)number == number; |
| } |
| |
| /** |
| * Returns true if double number can be represented as an int |
| * |
| * @param number a double to inspect |
| * |
| * @return true for int representable doubles |
| */ |
| public static boolean isRepresentableAsInt(final double number) { |
| return (int)number == number; |
| } |
| |
| /** |
| * Returns true if double number can be represented as a long |
| * |
| * @param number a double to inspect |
| * @return true for long representable doubles |
| */ |
| public static boolean isRepresentableAsLong(final double number) { |
| return (long)number == number; |
| } |
| |
| /** |
| * Check whether an object is primitive |
| * |
| * @param obj an object |
| * |
| * @return true if object is primitive (includes null and undefined) |
| */ |
| public static boolean isPrimitive(final Object obj) { |
| return obj == null || |
| obj == ScriptRuntime.UNDEFINED || |
| obj instanceof Boolean || |
| obj instanceof Number || |
| obj instanceof String || |
| obj instanceof ConsString; |
| } |
| |
| /** |
| * Primitive converter for an object |
| * |
| * @param obj an object |
| * |
| * @return primitive form of the object |
| */ |
| public static Object toPrimitive(final Object obj) { |
| return toPrimitive(obj, null); |
| } |
| |
| /** |
| * Primitive converter for an object including type hint |
| * See ECMA 9.1 ToPrimitive |
| * |
| * @param obj an object |
| * @param hint a type hint |
| * |
| * @return the primitive form of the object |
| */ |
| public static Object toPrimitive(final Object obj, final Class<?> hint) { |
| return obj instanceof ScriptObject ? toPrimitive((ScriptObject)obj, hint) : obj; |
| } |
| |
| private static Object toPrimitive(final ScriptObject sobj, final Class<?> hint) { |
| final Object result = sobj.getDefaultValue(hint); |
| |
| if (!isPrimitive(result)) { |
| throw typeError("bad.default.value", result.toString()); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Combines a hintless toPrimitive and a toString call. |
| * |
| * @param obj an object |
| * |
| * @return the string form of the primitive form of the object |
| */ |
| public static String toPrimitiveToString(Object obj) { |
| return toString(toPrimitive(obj)); |
| } |
| |
| /** |
| * JavaScript compliant conversion of number to boolean |
| * |
| * @param num a number |
| * |
| * @return a boolean |
| */ |
| public static boolean toBoolean(final double num) { |
| return num != 0 && !Double.isNaN(num); |
| } |
| |
| /** |
| * JavaScript compliant conversion of Object to boolean |
| * See ECMA 9.2 ToBoolean |
| * |
| * @param obj an object |
| * |
| * @return a boolean |
| */ |
| public static boolean toBoolean(final Object obj) { |
| if (obj instanceof Boolean) { |
| return (Boolean)obj; |
| } |
| |
| if (nullOrUndefined(obj)) { |
| return false; |
| } |
| |
| if (obj instanceof Number) { |
| final double num = ((Number)obj).doubleValue(); |
| return num != 0 && !Double.isNaN(num); |
| } |
| |
| if (obj instanceof String || obj instanceof ConsString) { |
| return ((CharSequence)obj).length() > 0; |
| } |
| |
| return true; |
| } |
| |
| |
| /** |
| * JavaScript compliant converter of Object to String |
| * See ECMA 9.8 ToString |
| * |
| * @param obj an object |
| * |
| * @return a string |
| */ |
| public static String toString(final Object obj) { |
| return toStringImpl(obj, false); |
| } |
| |
| /** |
| * If obj is an instance of {@link ConsString} cast to CharSequence, else return |
| * result of {@link #toString(Object)}. |
| * |
| * @param obj an object |
| * @return an instance of String or ConsString |
| */ |
| public static CharSequence toCharSequence(final Object obj) { |
| if (obj instanceof ConsString) { |
| return (CharSequence) obj; |
| } |
| return toString(obj); |
| } |
| |
| /** |
| * Check whether a string is representable as a JavaScript number |
| * |
| * @param str a string |
| * |
| * @return true if string can be represented as a number |
| */ |
| public static boolean isNumber(final String str) { |
| try { |
| Double.parseDouble(str); |
| return true; |
| } catch (final NumberFormatException e) { |
| return false; |
| } |
| } |
| |
| /** |
| * JavaScript compliant conversion of integer to String |
| * |
| * @param num an integer |
| * |
| * @return a string |
| */ |
| public static String toString(final int num) { |
| return Integer.toString(num); |
| } |
| |
| /** |
| * JavaScript compliant conversion of number to String |
| * See ECMA 9.8.1 |
| * |
| * @param num a number |
| * |
| * @return a string |
| */ |
| public static String toString(final double num) { |
| if (isRepresentableAsInt(num)) { |
| return Integer.toString((int)num); |
| } |
| |
| if (num == Double.POSITIVE_INFINITY) { |
| return "Infinity"; |
| } |
| |
| if (num == Double.NEGATIVE_INFINITY) { |
| return "-Infinity"; |
| } |
| |
| if (Double.isNaN(num)) { |
| return "NaN"; |
| } |
| |
| return NumberToString.stringFor(num); |
| } |
| |
| /** |
| * JavaScript compliant conversion of number to String |
| * |
| * @param num a number |
| * @param radix a radix for the conversion |
| * |
| * @return a string |
| */ |
| public static String toString(final double num, final int radix) { |
| assert radix >= 2 && radix <= 36 : "invalid radix"; |
| |
| if (isRepresentableAsInt(num)) { |
| return Integer.toString((int)num, radix); |
| } |
| |
| if (num == Double.POSITIVE_INFINITY) { |
| return "Infinity"; |
| } |
| |
| if (num == Double.NEGATIVE_INFINITY) { |
| return "-Infinity"; |
| } |
| |
| if (Double.isNaN(num)) { |
| return "NaN"; |
| } |
| |
| if (num == 0.0) { |
| return "0"; |
| } |
| |
| final String chars = "0123456789abcdefghijklmnopqrstuvwxyz"; |
| final StringBuilder sb = new StringBuilder(); |
| |
| final boolean negative = num < 0.0; |
| final double signedNum = negative ? -num : num; |
| |
| double intPart = Math.floor(signedNum); |
| double decPart = signedNum - intPart; |
| |
| // encode integer part from least significant digit, then reverse |
| do { |
| sb.append(chars.charAt((int) (intPart % radix))); |
| intPart /= radix; |
| } while (intPart >= 1.0); |
| |
| if (negative) { |
| sb.append('-'); |
| } |
| sb.reverse(); |
| |
| // encode decimal part |
| if (decPart > 0.0) { |
| final int dot = sb.length(); |
| sb.append('.'); |
| do { |
| decPart *= radix; |
| final double d = Math.floor(decPart); |
| sb.append(chars.charAt((int)d)); |
| decPart -= d; |
| } while (decPart > 0.0 && sb.length() - dot < 1100); |
| // somewhat arbitrarily use same limit as V8 |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * JavaScript compliant conversion of Object to number |
| * See ECMA 9.3 ToNumber |
| * |
| * @param obj an object |
| * |
| * @return a number |
| */ |
| public static double toNumber(final Object obj) { |
| if (obj instanceof Number) { |
| return ((Number)obj).doubleValue(); |
| } |
| return toNumberGeneric(obj); |
| } |
| |
| |
| /** |
| * JavaScript compliant conversion of Object to number |
| * See ECMA 9.3 ToNumber |
| * |
| * @param obj an object |
| * |
| * @return a number |
| */ |
| public static double toNumber(final ScriptObject obj) { |
| return toNumber(toPrimitive(obj, Number.class)); |
| } |
| |
| /** |
| * Digit representation for a character |
| * |
| * @param ch a character |
| * @param radix radix |
| * |
| * @return the digit for this character |
| */ |
| public static int digit(final char ch, final int radix) { |
| return digit(ch, radix, false); |
| } |
| |
| /** |
| * Digit representation for a character |
| * |
| * @param ch a character |
| * @param radix radix |
| * @param onlyIsoLatin1 iso latin conversion only |
| * |
| * @return the digit for this character |
| */ |
| public static int digit(final char ch, final int radix, final boolean onlyIsoLatin1) { |
| final char maxInRadix = (char)('a' + (radix - 1) - 10); |
| final char c = Character.toLowerCase(ch); |
| |
| if (c >= 'a' && c <= maxInRadix) { |
| return Character.digit(ch, radix); |
| } |
| |
| if (Character.isDigit(ch)) { |
| if (!onlyIsoLatin1 || ch >= '0' && ch <= '9') { |
| return Character.digit(ch, radix); |
| } |
| } |
| |
| return -1; |
| } |
| |
| /** |
| * JavaScript compliant String to number conversion |
| * |
| * @param str a string |
| * |
| * @return a number |
| */ |
| public static double toNumber(final String str) { |
| int end = str.length(); |
| if (end == 0) { |
| return 0.0; // Empty string |
| } |
| |
| int start = 0; |
| char f = str.charAt(0); |
| |
| while (Lexer.isJSWhitespace(f)) { |
| if (++start == end) { |
| return 0.0d; // All whitespace string |
| } |
| f = str.charAt(start); |
| } |
| |
| // Guaranteed to terminate even without start >= end check, as the previous loop found at least one |
| // non-whitespace character. |
| while (Lexer.isJSWhitespace(str.charAt(end - 1))) { |
| end--; |
| } |
| |
| final boolean negative; |
| if (f == '-') { |
| if(++start == end) { |
| return Double.NaN; // Single-char "-" string |
| } |
| f = str.charAt(start); |
| negative = true; |
| } else { |
| if (f == '+') { |
| if (++start == end) { |
| return Double.NaN; // Single-char "+" string |
| } |
| f = str.charAt(start); |
| } |
| negative = false; |
| } |
| |
| final double value; |
| if (start + 1 < end && f == '0' && Character.toLowerCase(str.charAt(start + 1)) == 'x') { |
| //decode hex string |
| value = parseRadix(str.toCharArray(), start + 2, end, 16); |
| } else { |
| // Fast (no NumberFormatException) path to NaN for non-numeric strings. We allow those starting with "I" or |
| // "N" to allow for parsing "NaN" and "Infinity" correctly. |
| if ((f < '0' || f > '9') && f != '.' && f != 'I' && f != 'N') { |
| return Double.NaN; |
| } |
| try { |
| value = Double.parseDouble(str.substring(start, end)); |
| } catch (final NumberFormatException e) { |
| return Double.NaN; |
| } |
| } |
| |
| return negative ? -value : value; |
| } |
| |
| /** |
| * JavaScript compliant Object to integer conversion. See ECMA 9.4 ToInteger |
| * |
| * <p>Note that this returns {@link java.lang.Integer#MAX_VALUE} or {@link java.lang.Integer#MIN_VALUE} |
| * for double values that exceed the int range, including positive and negative Infinity. It is the |
| * caller's responsibility to handle such values correctly.</p> |
| * |
| * @param obj an object |
| * @return an integer |
| */ |
| public static int toInteger(final Object obj) { |
| return (int)toNumber(obj); |
| } |
| |
| /** |
| * JavaScript compliant Object to long conversion. See ECMA 9.4 ToInteger |
| * |
| * <p>Note that this returns {@link java.lang.Long#MAX_VALUE} or {@link java.lang.Long#MIN_VALUE} |
| * for double values that exceed the long range, including positive and negative Infinity. It is the |
| * caller's responsibility to handle such values correctly.</p> |
| * |
| * @param obj an object |
| * @return a long |
| */ |
| public static long toLong(final Object obj) { |
| return (long)toNumber(obj); |
| } |
| |
| /** |
| * JavaScript compliant Object to int32 conversion |
| * See ECMA 9.5 ToInt32 |
| * |
| * @param obj an object |
| * @return an int32 |
| */ |
| public static int toInt32(final Object obj) { |
| return toInt32(toNumber(obj)); |
| } |
| |
| /** |
| * JavaScript compliant long to int32 conversion |
| * |
| * @param num a long |
| * @return an int32 |
| */ |
| public static int toInt32(final long num) { |
| return (int)num; |
| } |
| |
| /** |
| * JavaScript compliant number to int32 conversion |
| * |
| * @param num a number |
| * @return an int32 |
| */ |
| public static int toInt32(final double num) { |
| return (int)doubleToInt32(num); |
| } |
| |
| /** |
| * JavaScript compliant Object to int64 conversion |
| * |
| * @param obj an object |
| * @return an int64 |
| */ |
| public static long toInt64(final Object obj) { |
| return toInt64(toNumber(obj)); |
| } |
| |
| /** |
| * JavaScript compliant number to int64 conversion |
| * |
| * @param num a number |
| * @return an int64 |
| */ |
| public static long toInt64(final double num) { |
| if (Double.isInfinite(num)) { |
| return 0L; |
| } |
| return (long)num; |
| } |
| |
| /** |
| * JavaScript compliant Object to uint32 conversion |
| * |
| * @param obj an object |
| * @return a uint32 |
| */ |
| public static long toUint32(final Object obj) { |
| return toUint32(toNumber(obj)); |
| } |
| |
| /** |
| * JavaScript compliant number to uint32 conversion |
| * |
| * @param num a number |
| * @return a uint32 |
| */ |
| public static long toUint32(final double num) { |
| return doubleToInt32(num) & MAX_UINT; |
| } |
| |
| /** |
| * JavaScript compliant Object to uint16 conversion |
| * ECMA 9.7 ToUint16: (Unsigned 16 Bit Integer) |
| * |
| * @param obj an object |
| * @return a uint16 |
| */ |
| public static int toUint16(final Object obj) { |
| return toUint16(toNumber(obj)); |
| } |
| |
| /** |
| * JavaScript compliant number to uint16 conversion |
| * |
| * @param num a number |
| * @return a uint16 |
| */ |
| public static int toUint16(final int num) { |
| return num & 0xffff; |
| } |
| |
| /** |
| * JavaScript compliant number to uint16 conversion |
| * |
| * @param num a number |
| * @return a uint16 |
| */ |
| public static int toUint16(final long num) { |
| return ((int)num) & 0xffff; |
| } |
| |
| /** |
| * JavaScript compliant number to uint16 conversion |
| * |
| * @param num a number |
| * @return a uint16 |
| */ |
| public static int toUint16(final double num) { |
| return ((int)doubleToInt32(num)) & 0xffff; |
| } |
| |
| private static long doubleToInt32(final double num) { |
| final int exponent = Math.getExponent(num); |
| if (exponent < 31) { |
| return (long) num; // Fits into 32 bits |
| } |
| if (exponent >= 84) { |
| // Either infinite or NaN or so large that shift / modulo will produce 0 |
| // (52 bit mantissa + 32 bit target width). |
| return 0; |
| } |
| // This is rather slow and could probably be sped up using bit-fiddling. |
| final double d = (num >= 0) ? Math.floor(num) : Math.ceil(num); |
| return (long)(d % INT32_LIMIT); |
| } |
| |
| /** |
| * Check whether a number is finite |
| * |
| * @param num a number |
| * @return true if finite |
| */ |
| public static boolean isFinite(final double num) { |
| return !Double.isInfinite(num) && !Double.isNaN(num); |
| } |
| |
| /** |
| * Convert a primitive to a double |
| * |
| * @param num a double |
| * @return a boxed double |
| */ |
| public static Double toDouble(final double num) { |
| return num; |
| } |
| |
| /** |
| * Convert a primitive to a double |
| * |
| * @param num a long |
| * @return a boxed double |
| */ |
| public static Double toDouble(final long num) { |
| return (double)num; |
| } |
| |
| /** |
| * Convert a primitive to a double |
| * |
| * @param num an int |
| * @return a boxed double |
| */ |
| public static Double toDouble(final int num) { |
| return (double)num; |
| } |
| |
| /** |
| * Convert a boolean to an Object |
| * |
| * @param bool a boolean |
| * @return a boxed boolean, its Object representation |
| */ |
| public static Object toObject(final boolean bool) { |
| return bool; |
| } |
| |
| /** |
| * Convert a number to an Object |
| * |
| * @param num an integer |
| * @return the boxed number |
| */ |
| public static Object toObject(final int num) { |
| return num; |
| } |
| |
| /** |
| * Convert a number to an Object |
| * |
| * @param num a long |
| * @return the boxed number |
| */ |
| public static Object toObject(final long num) { |
| return num; |
| } |
| |
| /** |
| * Convert a number to an Object |
| * |
| * @param num a double |
| * @return the boxed number |
| */ |
| public static Object toObject(final double num) { |
| return num; |
| } |
| |
| /** |
| * Identity converter for objects. |
| * |
| * @param obj an object |
| * @return the boxed number |
| */ |
| public static Object toObject(final Object obj) { |
| return obj; |
| } |
| |
| /** |
| * Object conversion. This is used to convert objects and numbers to their corresponding |
| * NativeObject type |
| * See ECMA 9.9 ToObject |
| * |
| * @param obj the object to convert |
| * |
| * @return the wrapped object |
| */ |
| public static Object toScriptObject(final Object obj) { |
| return toScriptObject(Context.getGlobalTrusted(), obj); |
| } |
| |
| /** |
| * Object conversion. This is used to convert objects and numbers to their corresponding |
| * NativeObject type |
| * See ECMA 9.9 ToObject |
| * |
| * @param global the global object |
| * @param obj the object to convert |
| * |
| * @return the wrapped object |
| */ |
| public static Object toScriptObject(final ScriptObject global, final Object obj) { |
| if (nullOrUndefined(obj)) { |
| throw typeError(global, "not.an.object", ScriptRuntime.safeToString(obj)); |
| } |
| |
| if (obj instanceof ScriptObject) { |
| return obj; |
| } |
| |
| return ((GlobalObject)global).wrapAsObject(obj); |
| } |
| |
| /** |
| * Script object to Java array conversion. |
| * |
| * @param obj script object to be converted to Java array |
| * @param componentType component type of the destination array required |
| * @return converted Java array |
| */ |
| public static Object toJavaArray(final Object obj, final Class<?> componentType) { |
| if (obj instanceof ScriptObject) { |
| return ((ScriptObject)obj).getArray().asArrayOfType(componentType); |
| } else if (obj instanceof JSObject) { |
| final ArrayLikeIterator<?> itr = ArrayLikeIterator.arrayLikeIterator(obj); |
| final int len = (int) itr.getLength(); |
| final Object[] res = new Object[len]; |
| int idx = 0; |
| while (itr.hasNext()) { |
| res[idx++] = itr.next(); |
| } |
| return convertArray(res, componentType); |
| } else if(obj == null) { |
| return null; |
| } else { |
| throw new IllegalArgumentException("not a script object"); |
| } |
| } |
| |
| /** |
| * Java array to java array conversion - but using type conversions implemented by linker. |
| * |
| * @param src source array |
| * @param componentType component type of the destination array required |
| * @return converted Java array |
| */ |
| public static Object convertArray(final Object[] src, final Class<?> componentType) { |
| if(componentType == Object.class) { |
| for(int i = 0; i < src.length; ++i) { |
| final Object e = src[i]; |
| if(e instanceof ConsString) { |
| src[i] = e.toString(); |
| } |
| } |
| } |
| |
| final int l = src.length; |
| final Object dst = Array.newInstance(componentType, l); |
| final MethodHandle converter = Bootstrap.getLinkerServices().getTypeConverter(Object.class, componentType); |
| try { |
| for (int i = 0; i < src.length; i++) { |
| Array.set(dst, i, invoke(converter, src[i])); |
| } |
| } catch (final RuntimeException | Error e) { |
| throw e; |
| } catch (final Throwable t) { |
| throw new RuntimeException(t); |
| } |
| return dst; |
| } |
| |
| /** |
| * Converts a JavaScript object to a Java List. See {@link ListAdapter} for details. |
| * @param obj the object to convert. Can be any array-like object. |
| * @return a List that is live-backed by the JavaScript object. |
| */ |
| public static List<?> toJavaList(final Object obj) { |
| return ListAdapter.create(obj); |
| } |
| |
| /** |
| * Converts a JavaScript object to a Java Deque. See {@link ListAdapter} for details. |
| * @param obj the object to convert. Can be any array-like object. |
| * @return a Deque that is live-backed by the JavaScript object. |
| */ |
| public static Deque<?> toJavaDeque(final Object obj) { |
| return ListAdapter.create(obj); |
| } |
| |
| /** |
| * Check if an object is null or undefined |
| * |
| * @param obj object to check |
| * |
| * @return true if null or undefined |
| */ |
| public static boolean nullOrUndefined(final Object obj) { |
| return obj == null || obj == ScriptRuntime.UNDEFINED; |
| } |
| |
| static String toStringImpl(final Object obj, final boolean safe) { |
| if (obj instanceof String) { |
| return (String)obj; |
| } |
| |
| if (obj instanceof Number) { |
| return toString(((Number)obj).doubleValue()); |
| } |
| |
| if (obj == ScriptRuntime.UNDEFINED) { |
| return "undefined"; |
| } |
| |
| if (obj == null) { |
| return "null"; |
| } |
| |
| if (obj instanceof ScriptObject) { |
| if (safe) { |
| final ScriptObject sobj = (ScriptObject)obj; |
| final GlobalObject gobj = (GlobalObject)Context.getGlobalTrusted(); |
| return gobj.isError(sobj) ? |
| ECMAException.safeToString(sobj) : |
| sobj.safeToString(); |
| } |
| |
| return toString(toPrimitive(obj, String.class)); |
| } |
| |
| if (obj instanceof StaticClass) { |
| return "[JavaClass " + ((StaticClass)obj).getRepresentedClass().getName() + "]"; |
| } |
| |
| return obj.toString(); |
| } |
| |
| // trim from left for JS whitespaces. |
| static String trimLeft(final String str) { |
| int start = 0; |
| |
| while (start < str.length() && Lexer.isJSWhitespace(str.charAt(start))) { |
| start++; |
| } |
| |
| return str.substring(start); |
| } |
| |
| private static double parseRadix(final char chars[], final int start, final int length, final int radix) { |
| int pos = 0; |
| |
| for (int i = start; i < length ; i++) { |
| if (digit(chars[i], radix) == -1) { |
| return Double.NaN; |
| } |
| pos++; |
| } |
| |
| if (pos == 0) { |
| return Double.NaN; |
| } |
| |
| double value = 0.0; |
| for (int i = start; i < start + pos; i++) { |
| value *= radix; |
| value += digit(chars[i], radix); |
| } |
| |
| return value; |
| } |
| |
| private static double toNumberGeneric(final Object obj) { |
| if (obj == null) { |
| return +0.0; |
| } |
| |
| if (obj instanceof String) { |
| return toNumber((String)obj); |
| } |
| |
| if (obj instanceof ConsString) { |
| return toNumber(obj.toString()); |
| } |
| |
| if (obj instanceof Boolean) { |
| return (Boolean)obj ? 1 : +0.0; |
| } |
| |
| if (obj instanceof ScriptObject) { |
| return toNumber((ScriptObject)obj); |
| } |
| |
| if (obj instanceof JSObject) { |
| return ((JSObject)obj).toNumber(); |
| } |
| |
| return Double.NaN; |
| } |
| |
| private static Object invoke(final MethodHandle mh, final Object arg) { |
| try { |
| return mh.invoke(arg); |
| } catch (final RuntimeException | Error e) { |
| throw e; |
| } catch (final Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| } |
