/*
* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.oracle.truffle.regex;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.regex.result.RegexResult;
import com.oracle.truffle.regex.tregex.nodes.input.InputLengthNode;
import com.oracle.truffle.regex.tregex.nodes.input.InputReadNode;
public abstract class RegexExecRootNode extends RegexBodyNode {
private final boolean mustCheckUnicodeSurrogates;
private @Child InputLengthNode lengthNode;
private @Child InputReadNode charAtNode;
public RegexExecRootNode(RegexLanguage language, RegexSource source, boolean mustCheckUnicodeSurrogates) {
super(language, source);
this.mustCheckUnicodeSurrogates = mustCheckUnicodeSurrogates;
}
@Override
public final RegexResult execute(VirtualFrame frame) {
Object[] args = frame.getArguments();
assert args.length == 2;
Object input = args[0];
int fromIndex = (int) args[1];
if (fromIndex < 0 || fromIndex > inputLength(input)) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalArgumentException(String.format("got illegal fromIndex value: %d. fromIndex must be >= 0 and <= input length (%d)", fromIndex, inputLength(input)));
}
return execute(input, adjustFromIndex(fromIndex, input));
}
private int adjustFromIndex(int fromIndex, Object input) {
if (mustCheckUnicodeSurrogates && fromIndex > 0 && fromIndex < inputLength(input)) {
if (Character.isLowSurrogate((char) inputRead(input, fromIndex)) && Character.isHighSurrogate((char) inputRead(input, fromIndex - 1))) {
return fromIndex - 1;
}
}
return fromIndex;
}
public int inputLength(Object input) {
if (lengthNode == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
lengthNode = insert(InputLengthNode.create());
}
return lengthNode.execute(input);
}
public int inputRead(Object input, int i) {
if (charAtNode == null) {
CompilerDirectives.transferToInterpreterAndInvalidate();
charAtNode = insert(InputReadNode.create());
}
return charAtNode.execute(input, i);
}
protected abstract RegexResult execute(Object input, int fromIndex);
}