package antlr;
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.cs.usfca.edu
* Software rights: http://www.antlr.org/license.html
*
* $Id: //depot/code/org.antlr/release/antlr-2.7.7/antlr/CppCharFormatter.java#2 $
*/
// C++ code generator by Pete Wells: pete@yamuna.demon.co.uk
class
CppCharFormatter implements
CharFormatter {
/** Given a character value, return a string representing the character
* that can be embedded inside a string literal or character literal
* This works for Java/C/C++ code-generation and languages with compatible
* special-character-escapment.
*
* Used internally in CppCharFormatter and in
* CppCodeGenerator.converJavaToCppString.
*
* @param c The character of interest.
* @param forCharLiteral true to escape for char literal, false for string literal
* IGNORED!!
*/
public
String escapeChar(int
c, boolean
forCharLiteral) {
// System.out.println("CppCharFormatter.escapeChar("+c+")");
switch (
c) {
case '\n' : return "\\n";
case '\t' : return "\\t";
case '\r' : return "\\r";
case '\\' : return "\\\\";
case '\'' : return "\\'";
case '"' : return "\\\"";
default :
if (
c < ' ' ||
c > 126 )
{
if (
c > 255)
{
String s =
Integer.
toString(
c,16);
// put leading zeroes in front of the thing..
while(
s.
length() < 4 )
s = '0' +
s;
return "\\u" +
s;
}
else {
return "\\" +
Integer.
toString(
c,8);
}
}
else {
return
String.
valueOf((char)
c);
}
}
}
/** Converts a String into a representation that can be use as a literal
* when surrounded by double-quotes.
*
* Used for escaping semantic predicate strings for exceptions.
*
* @param s The String to be changed into a literal
*/
public
String escapeString(
String s)
{
String retval = new
String();
for (int
i = 0;
i <
s.
length();
i++)
retval +=
escapeChar(
s.
charAt(
i), false);
return
retval;
}
/** Given a character value, return a string representing the character
* literal that can be recognized by the target language compiler.
* This works for languages that use single-quotes for character literals.
* @param c The character of interest.
*/
public
String literalChar(int
c) {
String ret = "0x"+
Integer.
toString(
c,16);
if(
c >= 0 &&
c <= 126 )
ret += " /* '"+
escapeChar(
c,true)+"' */ ";
return
ret;
}
/** Converts a String into a string literal
* This works for languages that use double-quotes for string literals.
* Code-generators for languages should override this method.
*
* Used for the generation of the tables with token names
*
* @param s The String to be changed into a literal
*/
public
String literalString(
String s)
{
return "\"" +
escapeString(
s) + "\"";
}
}