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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2013, 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.api.utilities;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Helper function that allows to dump the AST during creation to a JSON format.
*
* @since 0.8 or earlier
*/
public final class JSONHelper {
private JSONHelper() {
}
private static String quote(CharSequence value) {
StringBuilder builder = new StringBuilder(value.length() + 2);
builder.append('"');
for (int i = 0; i < value.length(); i++) {
char c = value.charAt(i);
switch (c) {
case '"':
builder.append("\\\"");
break;
case '\\':
builder.append("\\\\");
break;
case '\b':
builder.append("\\b");
break;
case '\f':
builder.append("\\f");
break;
case '\n':
builder.append("\\n");
break;
case '\r':
builder.append("\\r");
break;
case '\t':
builder.append("\\t");
break;
default: {
if (c < ' ') {
builder.append("\\u00");
builder.append(Character.forDigit((c >> 4) & 0xF, 16));
builder.append(Character.forDigit(c & 0xF, 16));
} else {
builder.append(c);
}
}
}
}
builder.append('"');
return builder.toString();
}
/** @since 0.8 or earlier */
public static JSONObjectBuilder object() {
return new JSONObjectBuilder();
}
/** @since 0.8 or earlier */
public static JSONArrayBuilder array() {
return new JSONArrayBuilder();
}
/**
* @since 0.8 or earlier
*/
public abstract static class JSONStringBuilder {
private JSONStringBuilder() {
}
/** @since 0.8 or earlier */
@Override
public final String toString() {
StringBuilder sb = new StringBuilder();
appendTo(sb);
return sb.toString();
}
/** @since 0.8 or earlier */
protected abstract void appendTo(StringBuilder sb);
/** @since 0.8 or earlier */
protected static void appendValue(StringBuilder sb, Object value) {
if (value instanceof JSONStringBuilder) {
((JSONStringBuilder) value).appendTo(sb);
} else if (value instanceof Integer || value instanceof Boolean || value == null) {
sb.append(value);
} else {
sb.append(quote(String.valueOf(value)));
}
}
}
/** @since 0.8 or earlier */
public static final class JSONObjectBuilder extends JSONStringBuilder {
private final Map contents = new LinkedHashMap<>();
private JSONObjectBuilder() {
}
/** @since 0.8 or earlier */
public JSONObjectBuilder add(String key, String value) {
contents.put(key, value);
return this;
}
/** @since 0.8 or earlier */
public JSONObjectBuilder add(String key, Number value) {
contents.put(key, value);
return this;
}
/** @since 0.8 or earlier */
public JSONObjectBuilder add(String key, Boolean value) {
contents.put(key, value);
return this;
}
/** @since 0.8 or earlier */
public JSONObjectBuilder add(String key, JSONStringBuilder value) {
contents.put(key, value);
return this;
}
/** @since 0.8 or earlier */
@Override
protected void appendTo(StringBuilder sb) {
sb.append("{");
boolean comma = false;
for (Map.Entry entry : contents.entrySet()) {
if (comma) {
sb.append(", ");
}
sb.append(quote(entry.getKey()));
sb.append(": ");
appendValue(sb, entry.getValue());
comma = true;
}
sb.append("}");
}
}
/** @since 0.8 or earlier */
public static final class JSONArrayBuilder extends JSONStringBuilder {
private final List