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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id
\* */
package scalac.util;
public final class SourceRepresentation {
public static int digit2int(byte ch, int base) {
if ('0' <= ch && ch <= '9' && ch < '0' + base)
return ch - '0';
else if ('A' <= ch && ch < 'A' + base - 10)
return ch - 'A' + 10;
else if ('a' <= ch && ch < 'a' + base - 10)
return ch - 'a' + 10;
else
return -1;
}
public static byte int2digit(int x) {
if (x <= 9)
return (byte)(x + '0');
else
return (byte)(x - 10 + 'A');
}
/* the next 4 functions convert between three fundamental name
* representations:
* - string each character 16 bit,
* - source characters outside 0..127 are represented by
* unicode escapes, \ u X X X X
* - ascii characters outside 0..127 are represented by two or three
* byte sequences with high bit set (as in class file format).
*/
/** convert source bytes in source[offset..offset+len-1] to ascii.
*/
public static int source2ascii(byte source[], int offset, int len, byte ascii[]) {
int j = 0;
int i = 0;
while (i < len) {
if (source[offset + i] == '\\' && i + 1 < len) {
i++;
switch (source[offset + i]) {
case 'n':
ascii[j++] = (byte)'\n'; i++; continue;
case 't':
ascii[j++] = (byte)'\t'; i++; continue;
case 'b':
ascii[j++] = (byte)'\b'; i++; continue;
case 'r':
ascii[j++] = (byte)'\r'; i++; continue;
case 'f':
ascii[j++] = (byte)'\f'; i++; continue;
case 'u':
if (i + 4 < len) {
int code = 0;
int k = 1;
int d = 0;
while (k <= 4 && d >= 0) {
d = digit2int(source[offset + i + k], 16);
code = code * 16 + d;
k++;
}
if (d >= 0) {
if (code <= 0x7F)
ascii[j++] = (byte)code;
else
if (code <= 0x3FF) {
ascii[j++] = (byte)(0xC0 | (code >> 6));
ascii[j++] = (byte)(0x80 | (code & 0x3F));
} else {
ascii[j++] = (byte)(0xE0 | (code >> 12));
ascii[j++] = (byte)(0x80 |
((code >> 6) & 0x3F));
ascii[j++] = (byte)(0x80 | (code & 0x3F));
}
i = i + 5;
continue;
}
}
}
}
byte b = source[offset + i++];
if (b >= 0)
ascii[j++] = b;
else {
ascii[j++] = (byte)(0xC0 | ((b >> 6) & 0x3));
ascii[j++] = (byte)(0x80 | (b & 0x3F));
}
}
return j;
}
/** convert ascii bytes in ascii[offset..offset+len-1] to a string
*/
public static String ascii2string(byte ascii[], int offset, int len) {
char cs[] = new char[len];
int i = offset;
int j = 0;
len += offset;
while (i < len) {
int b = ascii[i++] & 0xFF;
if (b >= 0xE0) {
b = ((b & 0x0F) << 12) | (ascii[i++] & 0x3F) << 6;
b = b | (ascii[i++] & 0x3F);
}
else
if (b >= 0xC0)
b = ((b & 0x1F) << 6) | (ascii[i++] & 0x3F);
cs[j++] = (char)b;
}
return new String(cs, 0, j);
}
/** convert string to array of source bytes
*/
public static byte[] string2source(String s) {
byte[] source = new byte[s.length() * 6];
int j = 0;
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
switch (ch) {
case '\n':
source[j++] = (byte)'\\';
source[j++] = (byte)'n';
break;
case '\t':
source[j++] = (byte)'\\';
source[j++] = (byte)'t';
break;
case '\b':
source[j++] = (byte)'\\';
source[j++] = (byte)'b';
break;
case '\r':
source[j++] = (byte)'\\';
source[j++] = (byte)'r';
break;
case '\f':
source[j++] = (byte)'\\';
source[j++] = (byte)'f';
break;
case '\"':
source[j++] = (byte)'\\';
source[j++] = (byte)'\"';
break;
case '\'':
source[j++] = (byte)'\\';
source[j++] = (byte)'\'';
break;
case '\\':
source[j++] = (byte)'\\';
source[j++] = (byte)'\\';
break;
default:
if ((' ' <= ch) && (ch <= 127))
source[j++] = (byte)ch;
else {
source[j++] = (byte)'\\';
source[j++] = (byte)'u';
source[j++] = int2digit((ch >> 12) & 0xF);
source[j++] = int2digit((ch >> 8) & 0xF);
source[j++] = int2digit((ch >> 4) & 0xF);
source[j++] = int2digit(ch & 0xF);
}
}
}
byte[] res = new byte[j];
System.arraycopy(source, 0, res, 0, j);
return res;
}
/** convert string to array of ascii bytes
*/
public static byte[] string2ascii(String s) {
byte[] source = string2source(s);
byte[] ascii = new byte[source.length * 2];
int alen = source2ascii(source, 0, source.length, ascii);
byte[] res = new byte[alen];
System.arraycopy(ascii, 0, res, 0, alen);
return res;
}
/** escape all characters outside 32..127 in string s
*/
public static String escape(String s) {
try {
return new String(string2source(s), "8859_1");
} catch (java.io.UnsupportedEncodingException e) {
throw new InternalError(e.getMessage());
}
}
/** escape character c, if outside 32..127.
*/
public static String escape(char c) {
char[] s = {c};
return escape(new String(s));
}
}
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