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GraalVM is an ecosystem for compiling and running applications written in multiple languages.
GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime.
/*
* Copyright (c) 2017, 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 org.graalvm.polyglot;
import org.graalvm.polyglot.impl.AbstractPolyglotImpl.AbstractSourceSectionImpl;
/**
* Description of contiguous section of text within a {@link Source} of program code.; supports
* multiple modes of access to the text and its location.
*
* Two available source sections are considered equal if their sources, start and length are equal.
* {@link #isAvailable() Unavailable} source sections are compared by identity. Source sections are
* designed to be used as keys in hash maps.
*
* @since 1.0
*/
public final class SourceSection {
static volatile AbstractSourceSectionImpl IMPL;
final Source source;
final Object impl;
SourceSection(Source source, Object impl) {
this.source = source;
this.impl = impl;
}
/**
* Returns whether this is a special instance that signifies that source information is
* available. Available source sections are never equal to unavailable source sections.
* Unavailable source sections return the same indices and lengths as empty source sections
* starting at character index 0.
*
* @since 1.0
*/
public boolean isAvailable() {
return IMPL.isAvailable(impl);
}
/**
* Representation of the source program that contains this section.
*
* @return the source object.
* @since 1.0
*/
public Source getSource() {
return source;
}
/**
* Returns 1-based line number of the first character in this section (inclusive). Returns
* 1 for out of bounds or {@link #isAvailable() unavailable} source sections. Note
* that calling this method causes the {@link Source#getCharacters() code} of the
* {@link #getSource() source} to be loaded if it was not yet loaded.
*
* @return the starting line number.
* @since 1.0
*/
public int getStartLine() {
return IMPL.getStartLine(impl);
}
/**
* Returns the 1-based column number of the first character in this section (inclusive). Returns
* 1 for out of bounds or {@link #isAvailable() unavailable} source sections. Note
* that calling this method causes the {@link Source#getCharacters() code} of the
* {@link #getSource() source} to be loaded if it was not yet loaded.
*
* @return the starting column number.
* @since 1.0
*/
public int getStartColumn() {
return IMPL.getStartColumn(impl);
}
/**
* Returns 1-based line number of the last character in this section (inclusive). Returns
* 1 for out of bounds or {@link #isAvailable() unavailable} source sections. Note
* that calling this method causes the {@link Source#getCharacters() code} of the
* {@link #getSource() source} to be loaded if it was not yet loaded.
*
* @return the starting line number.
* @since 1.0
*/
public int getEndLine() {
return IMPL.getEndLine(impl);
}
/**
* Returns the 1-based column number of the last character in this section (inclusive). Returns
* 1 for out of bounds or {@link #isAvailable() unavailable} source sections. Note
* that calling this method causes the {@link Source#getCharacters() code} of the
* {@link #getSource() source} to be loaded if it was not yet loaded.
*
* @return the starting column number.
* @since 1.0
*/
public int getEndColumn() {
return IMPL.getEndColumn(impl);
}
/**
* Returns the 0-based index of the first character in this section. Returns 0 for
* {@link #isAvailable() unavailable} source sections. Note that calling this method does not
* cause the {@link Source#getCharacters() code} of the {@link #getSource() source} to be
* loaded. The returned index might be out of bounds of the source code if assertions (-ea) are
* not enabled.
*
* @return the starting character index.
* @since 1.0
*/
public int getCharIndex() {
return IMPL.getCharIndex(impl);
}
/**
* Returns the length of this section in characters. Returns 0 for
* {@link #isAvailable() unavailable} source sections. Note that calling this method does not
* cause the {@link Source#getCharacters() code} of the {@link #getSource() source} to be
* loaded. The returned length might be out of bounds of the source code if assertions (-ea) are
* not enabled.
*
* @return the number of characters in the section.
* @since 1.0
*/
public int getCharLength() {
return IMPL.getCharLength(impl);
}
/**
* Returns the index of the text position immediately following the last character in the
* section. Returns 0 for {@link #isAvailable() unavailable} source sections. Note
* that calling this method does not cause the {@link Source#getCharacters() code} of the
* {@link #getSource() source} to be loaded. The returned index might be out of bounds of the
* source code if assertions (-ea) are not enabled.
*
* @return the end position of the section.
* @since 0.8 or earlier
*/
public int getCharEndIndex() {
return IMPL.getCharEndIndex(impl);
}
/**
* Returns the source code fragment described by this section. Returns an empty string for out
* of bounds or {@link #isAvailable() unavailable} source sections. Note that calling this
* method causes the {@link Source#getCharacters() code} of the {@link #getSource() source} to
* be loaded if it was not yet loaded.
*
* @return the code as a string.
* @since 1.0
*/
public CharSequence getCharacters() {
return IMPL.getCode(impl);
}
/**
* @since 1.0
* @deprecated use {@link #getCharacters()}
*/
@Deprecated
public CharSequence getCode() {
return IMPL.getCode(impl);
}
/**
* Returns an implementation-defined string representation of this source section to be used for
* debugging purposes only.
*
* @see #getCharacters()
* @since 1.0
*/
@Override
public String toString() {
return IMPL.toString(impl);
}
/** @since 1.0 or earlier */
@Override
public int hashCode() {
return IMPL.hashCode(impl);
}
/** @since 1.0 or earlier */
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
Object otherImpl = obj;
if (otherImpl instanceof SourceSection) {
otherImpl = ((SourceSection) obj).impl;
}
return IMPL.equals(impl, otherImpl);
}
}