...
| Code Block |
|---|
ESC
: '\\'
( 'n' {this.setText("\n");}
| 't' {this.setText("\t");}
| 'v' {this.setText("\013");}
| 'b' {this.setText("\b");}
| 'r' {this.setText("\r");}
| 'f' {this.setText("\r");}
| 'a' {this.setText("\007");}
| '\\' {this.setText("\\");}
| '?' {this.setText("?");}
| '\'' {this.setText("'");}
| '"' {this.setText("\"");}
| OCTDIGIT (OCTDIGIT? OCTDIGIT)?
{
char[] realc = new char[1];
realc[0] = (char) Integer.valueOf($text, 8).intValue();
this.setText(new String(realc));
}
| 'x' HEXDIGIT HEXDIGIT?
{
char[] realc = new char[1];
realc[0] = (char) Integer.valueOf($text.substring(1), 16).intValue();
this.setText(new String(realc));
}
| 'u' HEXDIGIT ((HEXDIGIT? HEXDIGIT)? HEXDIGIT)?
{
char[] realc = new char[1];
realc[0] = (char) Integer.valueOf($text.substring(1), 16).intValue();
this.setText(new String(realc));
}
)
;
|
An alternative approach that may be useful.
| Code Block |
|---|
fragment
MARKER : '"' ;
ESCCHAR : '\\' ;
LITERAL : MARKER (options {greedy=false;}: ESCCHAR . | .)* MARKER ;
|
By the parser?
| Code Block |
|---|
UNICODE_LITERAL : '\\u' HEXDIGIT ((HEXDIGIT? HEXDIGIT)? HEXDIGIT)? ;
literal returns [char value] : UNICODE_LITERAL
{ $value = (char)Integer.valueOf($text.substring(1), 16).intValue(); } ;
|
...