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/*
* The MIT License (MIT)
*
* Copyright (c) 2016-2024 Objectionary.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall 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 NON-INFRINGEMENT. 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 org.eolang.parser;
import com.yegor256.xsline.Shift;
import com.yegor256.xsline.StEndless;
import com.yegor256.xsline.StEnvelope;
import com.yegor256.xsline.StSequence;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import org.apache.commons.text.StringEscapeUtils;
import org.xembly.Directive;
import org.xembly.Directives;
/**
* This {@link Shift} turns hex data inside XMIR
* into EO-printable data.
*
* @since 0.29.0
*/
public final class StUnhex extends StEnvelope {
/**
* Ctor.
*/
public StUnhex() {
super(
new StEndless(
new StSequence(
StUnhex.class.getSimpleName(),
new StXPath(
StUnhex.xpath("float"),
xml -> StUnhex.append(
"float",
Double.toString(
StUnhex.buffer(
StUnhex.unspace(xml.xpath("./o/text()").get(0))
).getDouble()
)
)
),
new StXPath(
StUnhex.xpath("int"),
xml -> StUnhex.append(
"int",
Long.toString(
StUnhex.buffer(
StUnhex.unspace(xml.xpath("./o/text()").get(0))
).getLong()
)
)
),
new StXPath(
StUnhex.xpath("string"),
xml -> StUnhex.append(
"string",
StringEscapeUtils.escapeJava(
new String(
StUnhex.buffer(
StUnhex.unspace(xml.xpath("./o/text()").get(0))
).array(),
StandardCharsets.UTF_8
)
)
)
),
new StXPath(
"(//o[@data='bytes' and (@base='bytes' or @base='org.eolang.bytes') and empty(text())]/parent::o[(@base='string' or @base='org.eolang.string')])[1]",
xml -> new Directives().set("").attr("data", "string")
)
)
)
);
}
/**
* Make a byte buffer from a string.
* @param txt The text
* @return The buffer of bytes
*/
private static ByteBuffer buffer(final String txt) {
final String[] parts = txt.split("(?<=\\G.{2})");
final ByteBuffer buffer = ByteBuffer.allocate(parts.length);
for (final String pair : parts) {
buffer.put((byte) Integer.parseInt(pair, 16));
}
buffer.position(0);
return buffer;
}
/**
* Remove all spaces from the given text, like "0A 7E 43" to "0A7E43".
* @param txt The text
* @return The same text, but without spaces
*/
private static String unspace(final String txt) {
final StringBuilder out = new StringBuilder(txt.length());
for (final char chr : txt.toCharArray()) {
if (chr == ' ') {
continue;
}
out.append(chr);
}
return out.toString();
}
/**
* Make XPath.
* @param type The type to match
* @return XPath
*/
private static String xpath(final String type) {
return String.format(
"(//o[@data='bytes' and (@base='bytes' or @base='org.eolang.bytes') and not(empty(text()))]/parent::o[(@base='%s' or @base='org.eolang.%1$s')])[1]",
type
);
}
/**
* Append Xemply instructions.
* @param type The type to match
* @param after Value after
* @return Dirs
*/
private static Iterable append(final String type,
final String after) {
return new Directives().set(after).attr("data", type);
}
}
