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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import java.util.OptionalInt;
/**
* Text utility functions.
*
* @author bratseth
*/
public final class Text {
private static final boolean[] allowedAsciiChars = new boolean[0x80];
static {
allowedAsciiChars[0x0] = false;
allowedAsciiChars[0x1] = false;
allowedAsciiChars[0x2] = false;
allowedAsciiChars[0x3] = false;
allowedAsciiChars[0x4] = false;
allowedAsciiChars[0x5] = false;
allowedAsciiChars[0x6] = false;
allowedAsciiChars[0x7] = false;
allowedAsciiChars[0x8] = false;
allowedAsciiChars[0x9] = true; //tab
allowedAsciiChars[0xA] = true; //nl
allowedAsciiChars[0xB] = false;
allowedAsciiChars[0xC] = false;
allowedAsciiChars[0xD] = true; //cr
for (int i = 0xE; i < 0x20; i++) {
allowedAsciiChars[i] = false;
}
for (int i = 0x20; i < 0x7F; i++) {
allowedAsciiChars[i] = true; //printable ascii chars
}
allowedAsciiChars[0x7F] = true; //del - discouraged, but allowed
}
/** No instantiation */
private Text() {}
/**
* Returns whether the given codepoint is a valid text character, potentially suitable for
* purposes such as indexing and display, see http://www.w3.org/TR/2006/REC-xml11-20060816/#charsets
*/
public static boolean isTextCharacter(int codepoint) {
// The link above notes that 0x7F-0x84 and 0x86-0x9F are discouraged, but they are still allowed -
// see http://www.w3.org/International/questions/qa-controls
if (codepoint < 0x80) return allowedAsciiChars[codepoint];
if (codepoint < 0xFDD0) return true;
if (codepoint <= 0xFDDF) return false;
if (codepoint < 0x1FFFE) return true;
if (codepoint <= 0x1FFFF) return false;
if (codepoint < 0x2FFFE) return true;
if (codepoint <= 0x2FFFF) return false;
if (codepoint < 0x3FFFE) return true;
if (codepoint <= 0x3FFFF) return false;
if (codepoint < 0x4FFFE) return true;
if (codepoint <= 0x4FFFF) return false;
if (codepoint < 0x5FFFE) return true;
if (codepoint <= 0x5FFFF) return false;
if (codepoint < 0x6FFFE) return true;
if (codepoint <= 0x6FFFF) return false;
if (codepoint < 0x7FFFE) return true;
if (codepoint <= 0x7FFFF) return false;
if (codepoint < 0x8FFFE) return true;
if (codepoint <= 0x8FFFF) return false;
if (codepoint < 0x9FFFE) return true;
if (codepoint <= 0x9FFFF) return false;
if (codepoint < 0xAFFFE) return true;
if (codepoint <= 0xAFFFF) return false;
if (codepoint < 0xBFFFE) return true;
if (codepoint <= 0xBFFFF) return false;
if (codepoint < 0xCFFFE) return true;
if (codepoint <= 0xCFFFF) return false;
if (codepoint < 0xDFFFE) return true;
if (codepoint <= 0xDFFFF) return false;
if (codepoint < 0xEFFFE) return true;
if (codepoint <= 0xEFFFF) return false;
if (codepoint < 0xFFFFE) return true;
if (codepoint <= 0xFFFFF) return false;
if (codepoint < 0x10FFFE) return true;
if (codepoint <= 0x10FFFF) return false;
return true;
}
/**
* Validates that the given string value only contains text characters and
* returns the first illegal code point if one is found.
*/
public static OptionalInt validateTextString(String value) {
for (int i = 0; i < value.length(); i++) {
char theChar = value.charAt(i);
int codePoint = value.codePointAt(i);
if (Character.isHighSurrogate(theChar)) {
// Skip one char ahead, since codePointAt() consumes one more char in this case
++i;
}
if (!Text.isTextCharacter(codePoint)) {
return OptionalInt.of(codePoint);
}
}
return OptionalInt.empty();
}
}
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