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/*
* Copyright (c) 2017, 2022, 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
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*/
package org.graalvm.polyglot;
import org.graalvm.polyglot.impl.AbstractPolyglotImpl.AbstractSourceSectionDispatch;
/**
* 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 19.0
*/
public final class SourceSection {
final Source source;
final AbstractSourceSectionDispatch dispatch;
final Object receiver;
SourceSection(Source source, AbstractSourceSectionDispatch dispatch, Object receiver) {
this.source = source;
this.dispatch = dispatch;
this.receiver = receiver;
}
/**
* 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 19.0
*/
public boolean isAvailable() {
return dispatch.isAvailable(receiver);
}
/**
* Returns true if this section has a line number information, false
* otherwise. When true, {@link #getStartLine()} and {@link #getEndLine()} return
* valid line numbers, when false, {@link #getStartLine()} and
* {@link #getEndLine()} return 1.
*
* @since 19.0
*/
public boolean hasLines() {
return dispatch.hasLines(receiver);
}
/**
* Returns true if this section has a column number information, false
* otherwise. When true, {@link #hasLines()} is true as well,
* {@link #getStartColumn()} and {@link #getEndColumn()} return valid column numbers. When
* false, {@link #getStartColumn()} and {@link #getEndColumn()} return
* 1.
*
* @since 19.0
*/
public boolean hasColumns() {
return dispatch.hasColumns(receiver);
}
/**
* Returns true if this section has a character index information,
* false otherwise. When true, {@link #getCharIndex()},
* {@link #getCharEndIndex()} and {@link #getCharLength()} return valid character indices, when
* false, {@link #getCharIndex()}, {@link #getCharEndIndex()} and
* {@link #getCharLength()} return 0.
*
* @since 19.0
*/
public boolean hasCharIndex() {
return dispatch.hasCharIndex(receiver);
}
/**
* Representation of the source program that contains this section.
*
* @return the source object.
* @since 19.0
*/
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, or
* source sections not {@link #hasLines() having lines}.
*
* @return the starting line number.
* @see #hasLines()
* @since 19.0
*/
public int getStartLine() {
return dispatch.getStartLine(receiver);
}
/**
* 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, or
* source sections not {@link #hasColumns() having columns}.
*
* @return the starting column number.
* @see #hasColumns()
* @since 19.0
*/
public int getStartColumn() {
return dispatch.getStartColumn(receiver);
}
/**
* 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, or
* source sections not {@link #hasLines() having lines}.
*
* @return the starting line number.
* @see #hasLines()
* @since 19.0
*/
public int getEndLine() {
return dispatch.getEndLine(receiver);
}
/**
* 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, or
* source sections not {@link #hasColumns() having columns}.
*
* @return the starting column number.
* @see #hasColumns()
* @since 19.0
*/
public int getEndColumn() {
return dispatch.getEndColumn(receiver);
}
/**
* Returns the 0-based index of the first character in this section. Returns 0 for
* {@link #isAvailable() unavailable} source sections, or sections not {@link #hasCharIndex()
* having character index}. The returned index might be out of bounds of the source code if
* assertions (-ea) are not enabled.
*
* @return the starting character index.
* @see #hasCharIndex()
* @since 19.0
*/
public int getCharIndex() {
return dispatch.getCharIndex(receiver);
}
/**
* Returns the length of this section in characters. Returns 0 for
* {@link #isAvailable() unavailable} source sections, or sections not {@link #hasCharIndex()
* having character index}. 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.
* @see #hasCharIndex()
* @since 19.0
*/
public int getCharLength() {
return dispatch.getCharLength(receiver);
}
/**
* Returns the index of the text position immediately following the last character in the
* section. Returns 0 for {@link #isAvailable() unavailable} source sections, or
* sections not {@link #hasCharIndex() having character index}. 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.
* @see #hasCharIndex()
* @since 19.0
*/
public int getCharEndIndex() {
return dispatch.getCharEndIndex(receiver);
}
/**
* @since 19.0
* @deprecated use {@link #getCharacters()} instead.
*/
@Deprecated(since = "19.0")
public CharSequence getCode() {
return dispatch.getCode(receiver);
}
/**
* Returns the source code fragment described by this section. Returns an empty string for out
* of bounds or {@link #isAvailable() unavailable} source sections.
*
* @return the code as a string.
* @since 19.0
*/
public CharSequence getCharacters() {
return dispatch.getCode(receiver);
}
/**
* Returns an implementation-defined string representation of this source section to be used for
* debugging purposes only.
*
* @see #getCharacters()
* @since 19.0
*/
@Override
public String toString() {
return dispatch.toString(receiver);
}
/** @since 19.0 or earlier */
@Override
public int hashCode() {
return dispatch.hashCode(receiver);
}
/** @since 19.0 or earlier */
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
Object otherImpl = obj;
if (otherImpl instanceof SourceSection) {
otherImpl = ((SourceSection) obj).receiver;
}
return dispatch.equals(receiver, otherImpl);
}
}
