diff options
Diffstat (limited to 'qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java')
-rw-r--r-- | qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java | 240 |
1 files changed, 120 insertions, 120 deletions
diff --git a/qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java b/qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java index 4a83edaeb5f..030ce91a50d 100644 --- a/qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java +++ b/qt/org.eclipse.cdt.qt.core/src/org/eclipse/cdt/qt/core/qmljs/QMLExpressionEvaluator.java @@ -1,120 +1,120 @@ -/*******************************************************************************
- * Copyright (c) 2015 QNX Software Systems and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * QNX Software Systems - Initial API and implementation
- *******************************************************************************/
-package org.eclipse.cdt.qt.core.qmljs;
-
-public final class QMLExpressionEvaluator {
- private QMLExpressionEvaluator() {
- }
-
- public static class InvalidExpressionException extends Exception {
-
- private static final long serialVersionUID = 4803923632666457229L;
-
- private IJSExpression offendingExpression;
-
- public InvalidExpressionException(String msg, IJSExpression expr) {
- super(msg);
- this.offendingExpression = expr;
- }
-
- public IJSExpression getOffendingExpression() {
- return offendingExpression;
- }
- }
-
- /**
- * Evaluates the given {@link IJSExpression} as a constant expression and returns the result. At the moment this only supports
- * very simple expressions involving unary operators and literals alone. Support for more complex expressions will be added as
- * needed.
- *
- * @param expr
- * the expression to be evaluated
- *
- * @throws InvalidExpressionException
- * if the given expression can't be reduced to a single constant
- */
- public static Object evaluateConstExpr(IJSExpression expr) throws InvalidExpressionException {
- if (expr instanceof IJSLiteral) {
- return ((IJSLiteral) expr).getValue();
- } else if (expr instanceof IJSUnaryExpression) {
- IJSUnaryExpression unary = (IJSUnaryExpression) expr;
- Object arg = evaluateConstExpr(unary.getArgument());
- switch (unary.getOperator()) {
- case Plus:
- return unaryPlus(arg, unary.getArgument());
- case Negation:
- return unaryNegate(arg, unary.getArgument());
- case BitwiseNot:
- return unaryBitwiseNot(arg, unary.getArgument());
- case Not:
- return unaryNot(arg, unary.getArgument());
- default:
- }
- }
- throw new InvalidExpressionException("Cannot reduce '" + expr + "' to a constant", expr); //$NON-NLS-1$ //$NON-NLS-2$
- }
-
- private static Object unaryPlus(Object object, IJSExpression expr) throws InvalidExpressionException {
- if (object instanceof Byte) {
- return +((Byte) object);
- } else if (object instanceof Short) {
- return +((Short) object);
- } else if (object instanceof Integer) {
- return +((Integer) object);
- } else if (object instanceof Long) {
- return +((Long) object);
- } else if (object instanceof Float) {
- return +((Float) object);
- } else if (object instanceof Double) {
- return +((Double) object);
- }
- throw new InvalidExpressionException("Cannot perform unary plus operation on a non-number", expr); //$NON-NLS-1$
- }
-
- private static Object unaryNegate(Object object, IJSExpression expr) throws InvalidExpressionException {
- if (object instanceof Byte) {
- return -((Byte) object);
- } else if (object instanceof Short) {
- return -((Short) object);
- } else if (object instanceof Integer) {
- return -((Integer) object);
- } else if (object instanceof Long) {
- return -((Long) object);
- } else if (object instanceof Float) {
- return -((Float) object);
- } else if (object instanceof Double) {
- return -((Double) object);
- }
- throw new InvalidExpressionException("Cannot perform unary negation operation on a non-number", expr); //$NON-NLS-1$
- }
-
- private static Object unaryBitwiseNot(Object object, IJSExpression expr) throws InvalidExpressionException {
- if (object instanceof Byte) {
- return ~((Byte) object);
- } else if (object instanceof Short) {
- return ~((Short) object);
- } else if (object instanceof Integer) {
- return ~((Integer) object);
- } else if (object instanceof Long) {
- return ~((Long) object);
- } else if (object instanceof Float || object instanceof Double) {
- return ~((Number) object).longValue();
- }
- throw new InvalidExpressionException("Cannot perform binary not operation on a non-number", expr); //$NON-NLS-1$
- }
-
- private static Object unaryNot(Object object, IJSExpression expr) throws InvalidExpressionException {
- if (object instanceof Boolean) {
- return !((Boolean) object);
- }
- throw new InvalidExpressionException("Cannot perform unary not operation on a non-boolean", expr); //$NON-NLS-1$
- }
-}
+/******************************************************************************* + * Copyright (c) 2015 QNX Software Systems and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * QNX Software Systems - Initial API and implementation + *******************************************************************************/ +package org.eclipse.cdt.qt.core.qmljs; + +public final class QMLExpressionEvaluator { + private QMLExpressionEvaluator() { + } + + public static class InvalidExpressionException extends Exception { + + private static final long serialVersionUID = 4803923632666457229L; + + private IJSExpression offendingExpression; + + public InvalidExpressionException(String msg, IJSExpression expr) { + super(msg); + this.offendingExpression = expr; + } + + public IJSExpression getOffendingExpression() { + return offendingExpression; + } + } + + /** + * Evaluates the given {@link IJSExpression} as a constant expression and returns the result. At the moment this only supports + * very simple expressions involving unary operators and literals alone. Support for more complex expressions will be added as + * needed. + * + * @param expr + * the expression to be evaluated + * + * @throws InvalidExpressionException + * if the given expression can't be reduced to a single constant + */ + public static Object evaluateConstExpr(IJSExpression expr) throws InvalidExpressionException { + if (expr instanceof IJSLiteral) { + return ((IJSLiteral) expr).getValue(); + } else if (expr instanceof IJSUnaryExpression) { + IJSUnaryExpression unary = (IJSUnaryExpression) expr; + Object arg = evaluateConstExpr(unary.getArgument()); + switch (unary.getOperator()) { + case Plus: + return unaryPlus(arg, unary.getArgument()); + case Negation: + return unaryNegate(arg, unary.getArgument()); + case BitwiseNot: + return unaryBitwiseNot(arg, unary.getArgument()); + case Not: + return unaryNot(arg, unary.getArgument()); + default: + } + } + throw new InvalidExpressionException("Cannot reduce '" + expr + "' to a constant", expr); //$NON-NLS-1$ //$NON-NLS-2$ + } + + private static Object unaryPlus(Object object, IJSExpression expr) throws InvalidExpressionException { + if (object instanceof Byte) { + return +((Byte) object); + } else if (object instanceof Short) { + return +((Short) object); + } else if (object instanceof Integer) { + return +((Integer) object); + } else if (object instanceof Long) { + return +((Long) object); + } else if (object instanceof Float) { + return +((Float) object); + } else if (object instanceof Double) { + return +((Double) object); + } + throw new InvalidExpressionException("Cannot perform unary plus operation on a non-number", expr); //$NON-NLS-1$ + } + + private static Object unaryNegate(Object object, IJSExpression expr) throws InvalidExpressionException { + if (object instanceof Byte) { + return -((Byte) object); + } else if (object instanceof Short) { + return -((Short) object); + } else if (object instanceof Integer) { + return -((Integer) object); + } else if (object instanceof Long) { + return -((Long) object); + } else if (object instanceof Float) { + return -((Float) object); + } else if (object instanceof Double) { + return -((Double) object); + } + throw new InvalidExpressionException("Cannot perform unary negation operation on a non-number", expr); //$NON-NLS-1$ + } + + private static Object unaryBitwiseNot(Object object, IJSExpression expr) throws InvalidExpressionException { + if (object instanceof Byte) { + return ~((Byte) object); + } else if (object instanceof Short) { + return ~((Short) object); + } else if (object instanceof Integer) { + return ~((Integer) object); + } else if (object instanceof Long) { + return ~((Long) object); + } else if (object instanceof Float || object instanceof Double) { + return ~((Number) object).longValue(); + } + throw new InvalidExpressionException("Cannot perform binary not operation on a non-number", expr); //$NON-NLS-1$ + } + + private static Object unaryNot(Object object, IJSExpression expr) throws InvalidExpressionException { + if (object instanceof Boolean) { + return !((Boolean) object); + } + throw new InvalidExpressionException("Cannot perform unary not operation on a non-boolean", expr); //$NON-NLS-1$ + } +} |