sk.antons.jaul.binary.Unicode Maven / Gradle / Ivy
/*
* Copyright 2015 Anton Straka
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sk.antons.jaul.binary;
import sk.antons.jaul.Is;
/**
* Converts String chars to escaped (\u0000) form string and vice versa.
* Only visible ASCII chars leave unchanged.
*
* @author antons
*/
public class Unicode {
/**
* Translates the given String into ASCII chars and others are escaped.
*
* @param input - string to be encoded
* @param ignoreInvisible - chars up to 31 will be not escaped (useful if
* you want to keep new lines and tabs)
* @return new String with escaped non visible ASII chars
*/
public static String escape(String input, boolean ignoreInvisible) {
if(Is.empty(input)) return input;
StringBuilder sb = new StringBuilder(input.length() + 30);
for(int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if((ignoreInvisible || (c > 31)) && (c < 127)) {
sb.append(c);
} else {
sb.append("\\u");
String hex = Integer.toHexString(c);
for(int j = hex.length(); j < 4; j++) sb.append( '0' );
sb.append( hex );
}
}
return sb.toString();
}
/**
* Decodes unicode escaped literal back to real String.
*
* @param input text with escape sequences
* @return String with translated escape sequences
*/
public static String unescape(String input) {
if(Is.empty(input)) return input;
StringBuilder sb = new StringBuilder( input.length() );
boolean isbs = false;
for (int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if (isbs) {
isbs = false;
if(c == 'f') c = '\f';
else if(c == 'n') c = '\n';
else if(c == 'r') c = '\r';
else if(c == 't') c = '\t';
else if(c == '\\') c = '\\';
else if(c == 'u') {
String hex = input.substring( i + 1, i + 5 );
c = (char) Integer.parseInt(hex, 16 );
i += 4;
} else {
sb.append('\\');
}
} else {
isbs = (c == '\\');
}
if (!isbs) sb.append(c);
}
return sb.toString();
}
/**
* Translates the given String into ASCII chars and others are escaped.
* excape also \r, \n. ... and other Java special characters
* @param input string to be escaped
* @return escaped string
*/
public static String escapeJava(String input) {
if(Is.empty(input)) return input;
StringBuilder sb = new StringBuilder(input.length() + 30);
for(int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if(c == '\b') sb.append("\\b");
else if(c == '\n') sb.append("\\n");
else if(c == '\r') sb.append("\\r");
else if(c == '\t') sb.append("\\t");
else if(c == '\f') sb.append("\\f");
else if(c == '\'') sb.append("\\\'");
else if(c == '\\') sb.append("\\\\");
else if(c == '"') sb.append("\\\"");
else if((c > 31) && (c < 127)) sb.append(c);
else {
sb.append("\\u");
String hex = Integer.toHexString(c);
for(int j = hex.length(); j < 4; j++) sb.append( '0' );
sb.append( hex );
}
}
return sb.toString();
}
/**
* Decodes unicode escaped literal back to real String.
* unexape also Java special characters like \n \r, ...
*
* @param input text with escape sequences
* @return String with translated escape sequences
*/
public static String unescapeJava(String input) {
if(Is.empty(input)) return input;
StringBuilder sb = new StringBuilder( input.length() );
boolean isbs = false;
for (int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if (isbs) {
isbs = false;
if(c == 'f') c = '\f';
else if(c == 'n') c = '\n';
else if(c == 'r') c = '\r';
else if(c == 't') c = '\t';
else if(c == 'b') c = '\b';
else if(c == '\\') c = '\\';
else if(c == '"') c = '"';
else if(c == '\'') c = '\'';
else if(c == 'u') {
String hex = input.substring( i + 1, i + 5 );
c = (char) Integer.parseInt(hex, 16 );
i += 4;
} else {
sb.append('\\');
}
} else {
isbs = (c == '\\');
}
if (!isbs) sb.append(c);
}
return sb.toString();
}
/**
* Translates the given String into ASCII chars and others are escaped.
* Uses HTML &#XXX; escape form;
*
* @param input - string to be encoded
* @param ignoreInvisible - chars up to 31 will be not escaped (useful if
* you want to keep new lines and tabs)
* @return new String with escaped non visible ASII chars
*/
public static String escapeHtml( String input, boolean ignoreInvisible) {
if(Is.empty(input)) return input;
StringBuilder buff = new StringBuilder();
for(int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if((ignoreInvisible || (c > 31)) && (c < 127)) buff.append(c);
else buff.append("&#").append((int)c).append(';');
}
return buff.toString();
}
/**
* Decodes unicode escaped literal back to real String.
* Uses HTML &#XXX; escape form;
*
* @param input text with escape sequences
* @return String with translated escape sequences
*/
public static String unescapeHtml(String input) {
if(Is.empty(input)) return input;
StringBuilder buff = new StringBuilder();
/*
0 - none
1 - and
2 - cross
3 - num
4 - ;
*/
int state = 0;
int sbuff = 0;
for(int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if(state == 0) {
if(c == '&') {
state = 1;
continue;
}
} else if(state == 1) {
if(c == '#') {
state = 2;
sbuff = 0;;
continue;
} else {
buff.append('&');
state = 0;
}
} else if(state == 2) {
if(('0' <= c) && (c <= '9')) {
state = 3;
sbuff = 10*sbuff + (c - '0');
continue;
} else {
buff.append('&');
buff.append('#');
state = 0;
}
} else if(state == 3) {
if(('0' <= c) && (c <= '9')) {
state = 3;
sbuff = 10*sbuff + (c - '0');
continue;
} else if((c == ';')) {
buff.append((char)sbuff);
state = 0;
continue;
} else {
buff.append('&');
buff.append('#');
buff.append(sbuff);
state = 0;
}
}
buff.append(c);
}
return buff.toString();
}
}
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