persistence.antlr.CppCharFormatter Maven / Gradle / Ivy
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package persistence.antlr;
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
*/
// C++ code generator by Pete Wells: [email protected]
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
*/
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 forCharLiteral ? "\\'" : "'";
case '"' : return forCharLiteral ? "\"" : "\\\"";
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) + "\"";
}
}