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/*
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby.internal.apt.escape;
import java.io.IOException;
import java.io.StringWriter;
import java.io.UncheckedIOException;
import java.io.Writer;
import java.util.Locale;
import java.util.Objects;
/**
* An API for translating text. Its core use is to escape and unescape text. Because escaping and
* unescaping is completely contextual, the API does not present two separate signatures.
*
* @since 1.0
*/
abstract class CharSequenceTranslator {
/** Array containing the hexadecimal alphabet. */
static final char[] HEX_DIGITS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
/**
* Returns an upper case hexadecimal {@code String} for the given character.
*
* @param codePoint The code point to convert.
* @return An upper case hexadecimal {@code String}
*/
public static String hex(final int codePoint) {
return Integer.toHexString(codePoint).toUpperCase(Locale.ENGLISH);
}
/**
* Helper for non-Writer usage.
*
* @param input CharSequence to be translated
* @return String output of translation
*/
public final String translate(final CharSequence input) {
try {
final StringWriter writer = new StringWriter(input.length() * 2);
translate(input, writer);
return writer.toString();
} catch (final IOException ioe) {
// this should never ever happen while writing to a StringWriter
throw new UncheckedIOException(ioe);
}
}
/**
* Translate a set of code points, represented by an int index into a CharSequence, into another
* set of code points. The number of code points consumed must be returned, and the only
* IOExceptions thrown must be from interacting with the Writer so that the top level API may
* reliably ignore StringWriter IOExceptions.
*
* @param input CharSequence that is being translated
* @param index int representing the current point of translation
* @param writer Writer to translate the text to
* @return int count of code points consumed
* @throws IOException if and only if the Writer produces an IOException
*/
public abstract int translate(CharSequence input, int index, Writer writer) throws IOException;
/**
* Translate an input onto a Writer. This is intentionally final as its algorithm is tightly
* coupled with the abstract method of this class.
*
* @param input CharSequence that is being translated
* @param writer Writer to translate the text to
* @throws IOException if and only if the Writer produces an IOException
*/
public final void translate(final CharSequence input, final Writer writer) throws IOException {
Objects.requireNonNull(writer, "The Writer must not be null");
int pos = 0;
final int len = input.length();
while (pos < len) {
final int consumed = translate(input, pos, writer);
if (consumed == 0) {
// inlined implementation of
// Character.toChars(Character.codePointAt(input, pos))
// avoids allocating temp char arrays and duplicate checks
final char c1 = input.charAt(pos);
writer.write(c1);
pos++;
if (Character.isHighSurrogate(c1) && pos < len) {
final char c2 = input.charAt(pos);
if (Character.isLowSurrogate(c2)) {
writer.write(c2);
pos++;
}
}
continue;
}
// contract with translators is that they have to understand code points
// and they just took care of a surrogate pair
for (int pt = 0; pt < consumed; pt++) {
pos += Character.charCount(Character.codePointAt(input, pos));
}
}
}
/**
* Helper method to create a merger of this translator with another set of translators. Useful in
* customizing the standard functionality.
*
* @param translators CharSequenceTranslator array of translators to merge with this one
* @return CharSequenceTranslator merging this translator with the others
*/
public final CharSequenceTranslator with(final CharSequenceTranslator... translators) {
final CharSequenceTranslator[] newArray = new CharSequenceTranslator[translators.length + 1];
newArray[0] = this;
System.arraycopy(translators, 0, newArray, 1, translators.length);
return new AggregateTranslator(newArray);
}
}
