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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config;
import com.yahoo.config.text.StringUtilities;
/**
* A StringNode class represents a string in a {@link ConfigInstance}.
*
* @author larschr
*/
public class StringNode extends LeafNode<String> {
/**
* Creates a new un-initialized StringNode.
*/
public StringNode() {
}
/**
* Creates a new StringNode, initialized to <code>value</code>.
*
* @param value the value of this StringNode.
*/
public StringNode(String value) {
super(true);
this.value = value;
}
/**
* Returns the value of this string. Same as {@link #getValue()}
* since the value of this node is a String (but implementations
* in other {@link LeafNode} subclasses differ).
*
* @return the string representation of this StringNode, or null if
* the value is explicitly set to null
*/
public String value() {
return value;
}
@Override
public String getValue() {
return value();
}
@Override
public String toString() {
return (value == null) ? "(null)" : '"' + StringUtilities.escape(getValue()) + '"';
}
/**
* Remove character escape codes.
*
* @param string escaped string
* @return unescaped string
*/
public static String unescapeQuotedString(String string) {
StringBuilder sb = new StringBuilder(string);
for (int i = 0; i < sb.length(); i++) {
if (sb.charAt(i) == '\\') {
sb.deleteCharAt(i);
if (i == sb.length()) {
throw new IllegalArgumentException("Parse error" + string);
}
switch (sb.charAt(i)) {
case 'n' -> sb.setCharAt(i, '\n');
case 'r' -> sb.setCharAt(i, '\r');
case 't' -> sb.setCharAt(i, '\t');
case 'f' -> sb.setCharAt(i, '\f');
case 'x' -> {
if (i + 2 >= sb.length()) {
throw new IllegalArgumentException("Could not parse hex value " + string);
}
sb.setCharAt(i, (char) Integer.parseInt(sb.substring(i + 1, i + 3), 16));
sb.delete(i + 1, i + 3);
}
case '\\' -> sb.setCharAt(i, '\\');
}
}
}
if (sb.length() > 0 && (sb.charAt(0) == '"') && sb.charAt(sb.length() - 1) == '"') {
sb.deleteCharAt(sb.length() - 1);//remove last quote
if (sb.length() > 0) {
sb.deleteCharAt(0); //remove first quote
}
}
return sb.toString();
}
/**
* Sets the value of this string from the string representation
* of this value in the (escaped) input configuration. The value
* supplied to this method needs un-escaping and will be
* un-escaped.
*
* @param value the new value of this node.
*/
@Override
protected boolean doSetValue(String value) {
if (value.startsWith("\"") && value.endsWith("\""))
this.value = unescapeQuotedString(value);
else {
//TODO: unquoted strings can be probably be prohibited now.(?) -gv
this.value = value;
}
return true;
}
}
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