Replace the escape sequences from the quoted string representation. - Java java.lang

Java examples for java.lang:String Quote

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Description

Replace the escape sequences from the quoted string representation.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String str = "java2s.com";
        System.out.println(replaceEscapeSeq(str));
    }/* ww  w  .j a  v  a  2 s  .co m*/

    /** Replace the escape sequences from the quoted string representation. */
    public final static String replaceEscapeSeq(String str) {
        int i = 0;
        int l = str.length();
        char c;
        String num;
        StringBuffer buf;
        int n;

        if ((i < l) && (str.charAt(0) == '"')) {
            i++;
            l--;
        } // end if
        buf = new StringBuffer(l + 2);
        while (i < l) {
            c = str.charAt(i++);
            if (c == '\\') {
                try {
                    c = str.charAt(i++);
                    switch (c) {
                    case 'n':
                        buf.append('\n');
                        break;
                    case 't':
                        buf.append('\t');
                        break;
                    case 'b':
                        buf.append('\b');
                        break;
                    case 'r':
                        buf.append('\r');
                        break;
                    case 'f':
                        buf.append('\f');
                        break;
                    case '\\':
                        buf.append('\\');
                        break;
                    case '\'':
                        buf.append('\'');
                        break;
                    case '"':
                        buf.append('"');
                        break;
                    case 'u':
                        num = "" + str.charAt(i++) + str.charAt(i++)
                                + str.charAt(i++) + str.charAt(i++);
                        n = Integer.parseInt(num, 16);
                        buf.append((char) n);
                        break;
                    case '0':
                    case '1':
                    case '2':
                    case '3':
                    case '4':
                    case '5':
                    case '6':
                    case '7':
                        num = "" + str.charAt(i++) + str.charAt(i++)
                                + str.charAt(i++);
                        n = Integer.parseInt(num, 8);
                        buf.append((char) n);
                        break;
                    default:
                    } // end switch
                } catch (StringIndexOutOfBoundsException e) {
                } catch (NumberFormatException e) {
                }
            } else {
                buf.append(c);
            } // end if
        } // end while
        return buf.toString();
    }
}

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