persistence.antlr.JavaCharFormatter Maven / Gradle / Ivy
package persistence.antlr;
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
*/
class JavaCharFormatter 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.
* Code-generators for languages should override this method.
* @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) {
switch (c) {
// case GrammarAnalyzer.EPSILON_TYPE : return "";
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 ((0x0000 <= c) && (c <= 0x000F)) {
return "\\u000" + Integer.toString(c, 16);
}
else if ((0x0010 <= c) && (c <= 0x00FF)) {
return "\\u00" + Integer.toString(c, 16);
}
else if ((0x0100 <= c) && (c <= 0x0FFF)) {
return "\\u0" + Integer.toString(c, 16);
}
else {
return "\\u" + Integer.toString(c, 16);
}
}
else {
return String.valueOf((char)c);
}
}
}
/** Converts a String into a representation that can be use as a literal
* when surrounded by double-quotes.
* @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.
* Code-generators for languages should override this method.
* @param c The character of interest.
*/
public String literalChar(int c) {
return "'" + escapeChar(c, true) + "'";
}
/** 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.
* @param s The String to be changed into a literal
*/
public String literalString(String s) {
return "\"" + escapeString(s) + "\"";
}
}