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The GraalVM compiler and the Graal-truffle optimizer.
/*
* Copyright (c) 2021, 2023, 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.util.json;
import java.util.List;
import java.util.Map;
import org.graalvm.collections.EconomicMap;
import org.graalvm.collections.MapCursor;
public class JSONFormatter {
private static final String DEFAULT_INDENT = " ";
private static final String EMPTY_STRING = "";
private static final String DOUBLE_QUOTE_ESCAPED = "\\\"";
private static final String BACKSLASH_ESCAPED = "\\\\";
private static final String BACKSPACE_ESCAPED = "\\b";
private static final String FORM_FEED_ESCAPED = "\\f";
private static final String NEWLINE_ESCAPED = "\\n";
private static final String CARRIAGE_RETURN_ESCAPED = "\\r";
private static final String TAB_ESCAPED = "\\t";
private static final String UNICODE_CHARACTER_PREFIX = "\\u00";
private static final char LEFT_CURLY_BRACKET = '{';
private static final char RIGHT_CURLY_BRACKET = '}';
private static final char LEFT_SQUARE_BRACKET = '[';
private static final char RIGHT_SQUARE_BRACKET = ']';
private static final String COMMA_NEWLINE = ",\n";
private static final String COMMA_SPACE = ", ";
private static final String COLON_SPACE = ": ";
private static final char NEWLINE = '\n';
private static final char DOUBLE_QUOTE = '"';
private static final char BACKSLASH = '\\';
private static final char BACKSPACE = '\b';
private static final char FORM_FEED = '\f';
private static final char CARRIAGE_RETURN = '\r';
private static final char TAB = '\t';
private static final char SPACE = ' ';
public static String formatJSON(EconomicMap map) {
return formatJSON(map, false);
}
public static String formatJSON(EconomicMap map, boolean indent) {
StringBuilder sb = new StringBuilder();
appendTo(sb, map, indent ? DEFAULT_INDENT : null, EMPTY_STRING);
return sb.toString();
}
public static String formatJSON(List elements) {
return formatJSON(elements, false);
}
public static String formatJSON(List elements, boolean indent) {
StringBuilder sb = new StringBuilder();
appendTo(sb, elements, indent ? DEFAULT_INDENT : null, EMPTY_STRING);
return sb.toString();
}
private static String quote(CharSequence value) {
StringBuilder builder = new StringBuilder(value.length() + 2);
builder.append(DOUBLE_QUOTE);
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
switch (c) {
case DOUBLE_QUOTE:
builder.append(DOUBLE_QUOTE_ESCAPED);
break;
case BACKSLASH:
builder.append(BACKSLASH_ESCAPED);
break;
case BACKSPACE:
builder.append(BACKSPACE_ESCAPED);
break;
case FORM_FEED:
builder.append(FORM_FEED_ESCAPED);
break;
case NEWLINE:
builder.append(NEWLINE_ESCAPED);
break;
case CARRIAGE_RETURN:
builder.append(CARRIAGE_RETURN_ESCAPED);
break;
case TAB:
builder.append(TAB_ESCAPED);
break;
default: {
if (c < SPACE) {
builder.append(UNICODE_CHARACTER_PREFIX);
builder.append(Character.forDigit((c >> 4) & 0xF, 16));
builder.append(Character.forDigit(c & 0xF, 16));
} else {
builder.append(c);
}
}
}
}
builder.append(DOUBLE_QUOTE);
return builder.toString();
}
static void appendValue(StringBuilder sb, Object value, String indent, String currentIndent) {
if (value instanceof EconomicMap) {
appendTo(sb, (EconomicMap) value, indent, currentIndent);
} else if (value instanceof List) {
appendTo(sb, (List) value, indent, currentIndent);
} else if (value instanceof Number || value instanceof Boolean || value == null) {
sb.append(value);
} else {
if (value instanceof Map) {
throw new IllegalArgumentException(value + " must use EconomicMap");
}
sb.append(quote(String.valueOf(value)));
}
}
static void appendTo(StringBuilder sb, List contents, String indent, String currentIndent) {
String newIndent = indent + currentIndent;
sb.append(LEFT_SQUARE_BRACKET);
if (indent != null) {
sb.append(NEWLINE);
}
boolean comma = false;
for (Object value : contents) {
if (comma) {
if (indent != null) {
sb.append(COMMA_NEWLINE);
} else {
sb.append(COMMA_SPACE);
}
}
if (indent != null) {
sb.append(newIndent);
}
appendValue(sb, value, indent, newIndent);
comma = true;
}
if (indent != null) {
sb.append(NEWLINE);
sb.append(currentIndent);
}
sb.append(RIGHT_SQUARE_BRACKET);
}
static void appendTo(StringBuilder sb, EconomicMap contents, String indent, String currentIndent) {
String newIndent = indent + currentIndent;
if (indent != null) {
sb.append(currentIndent);
}
sb.append(LEFT_CURLY_BRACKET);
if (indent != null) {
sb.append(NEWLINE);
}
boolean comma = false;
MapCursor cursor = contents.getEntries();
while (cursor.advance()) {
if (comma) {
if (indent != null) {
sb.append(COMMA_NEWLINE);
} else {
sb.append(COMMA_SPACE);
}
}
if (indent != null) {
sb.append(newIndent);
}
sb.append(quote((String) cursor.getKey()));
sb.append(COLON_SPACE);
appendValue(sb, cursor.getValue(), indent, newIndent);
comma = true;
}
if (indent != null) {
sb.append(NEWLINE);
sb.append(currentIndent);
}
sb.append(RIGHT_CURLY_BRACKET);
}
}
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