Android Utililty Methods String Escape

List of utility methods to do String Escape

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Description

The list of methods to do String Escape are organized into topic(s).

Method

StringjavaScriptUnescape(String s)
Undo escaping as performed in javaScriptEscape(.) Throws an IllegalArgumentException if the string contains bad escaping. 
StringBuilder sb = new StringBuilder(s.length());
for (int i = 0; i < s.length();) {
    char c = s.charAt(i);
    if (c == '\\') {
        i = javaScriptUnescapeHelper(s, i + 1, sb);
    } else {
        sb.append(c);
        i++;
...
intjavaScriptUnescapeHelper(String s, int i, StringBuilder sb)
Looks for an escape code starting at index i of s, and appends it to sb. 
if (i >= s.length()) {
    throw new IllegalArgumentException(
            "End-of-string after escape character in [" + s + "]");
char c = s.charAt(i++);
switch (c) {
case 'n':
    sb.append('\n');
...
StringunescapeCString(String s)
Unescape any C escape sequences (\n, \r, \\, \ooo, etc) and return the resulting string. 
if (s.indexOf('\\') < 0) {
    return s;
StringBuilder sb = new StringBuilder();
int len = s.length();
for (int i = 0; i < len;) {
    char c = s.charAt(i++);
    if (c == '\\' && (i < len)) {
...
StringunescapeMySQLString(String s)
Unescape any MySQL escape sequences. 
char chars[] = s.toCharArray();
if (chars.length < 2 || chars[0] != chars[chars.length - 1]
        || (chars[0] != '\'' && chars[0] != '"')) {
    throw new IllegalArgumentException("not a valid MySQL string: "
            + s);
int j = 1; 
int f = 0; 
...
StringescapeString(String value)
escape String 
int len = value.length();
StringBuilder sb = new StringBuilder(len * 3 / 2);
for (int i = 0; i < len; i++) {
    char c = value.charAt(i);
    if ((c >= ' ') && (c < 0x7f)) {
        if ((c == '\'') || (c == '\"') || (c == '\\')) {
            sb.append('\\');
        sb.append(c);
        continue;
    } else if (c <= 0x7f) {
        switch (c) {
        case '\n':
            sb.append("\\n");
            continue;
        case '\r':
            sb.append("\\r");
            continue;
        case '\t':
            sb.append("\\t");
            continue;
    sb.append("\\u");
    sb.append(Character.forDigit(c >> 12, 16));
    sb.append(Character.forDigit((c >> 8) & 0x0f, 16));
    sb.append(Character.forDigit((c >> 4) & 0x0f, 16));
    sb.append(Character.forDigit(c & 0x0f, 16));
return sb.toString();