static final Regex getv() {
// Thanks to Michael Jimenez for pointing out the need
// to clone getvar rather than simply returning it.
// Previously this was not thread safe.
// if(getvar != null) return getvar;
if (getvar != null) return (Regex) getvar.clone();
getvar =
new Regex(
"(?:\\\\(\\d+)|"
+ // ref 1
"\\$(?:"
+ "(\\d+)|"
+ // ref 2
"(\\w+)|"
+ // ref 3
"([&'`])|"
+ // ref 4
"\\{(?:(\\d+)|"
+ // ref 5
"([^\n}\\\\]+))}"
+ // ref 6
")|"
+ "\\\\([nrbtaef])|"
+ // ref 7
"\\\\c([\u0000-\uFFFF])|"
+ // ref 8
"\\\\x([A-Fa-f0-9]{2})|"
+ // ref 9
"\\\\([\u0000-\uFFFF])"
+ // ref 10
")");
getvar.optimize();
return getvar;
}
@Override
public void meet(Regex re) throws RuntimeException {
builder.append(
optimizeRegexp(
new ValueExpressionEvaluator(re.getArg(), parent, ValueType.STRING).build(),
new ValueExpressionEvaluator(re.getPatternArg(), parent, ValueType.STRING).build(),
re.getFlagsArg()));
}
/**
* Compile a ReplaceRule using the text that would go between the second and third /'s in a
* typical substitution pattern in Perl: s/ ... / <i>The argument to ReplaceRule.perlCode</i> /.
*/
public static ReplaceRule perlCode(String s) {
// String sav_backGs = Regex.backGs;
// int sav_backGto = Regex.backGto;
try {
int mf = 0, mt = 0;
Regex gv = getv();
ReplaceRule head = null;
Object tmp = null;
while (gv.searchFrom(s, mt)) {
int off = Regex.BackRefOffset - 1;
mf = gv.matchedFrom();
if (mf > mt) head = add(head, new StringRule(s.substring(mt, mf)));
String var = null;
if ((var = gv.stringMatched(1 + off)) != null
|| (var = gv.stringMatched(2 + off)) != null
|| (var = gv.stringMatched(5 + off)) != null) {
int d = 0;
for (int i = 0; i < var.length(); i++) d = 8 * d + (var.charAt(i) - '0');
if (var.length() == 1) head = add(head, new BackRefRule(d));
else head = new StringRule("" + (char) d);
} else if ((var = gv.stringMatched(10 + off)) != null) {
if ("QELlUu".indexOf(var) >= 0) head = add(head, new CodeRule(var.charAt(0)));
else head = add(head, new StringRule(var));
} else if ((var = gv.stringMatched(3 + off)) != null
|| (var = gv.stringMatched(4 + off)) != null
|| (var = gv.stringMatched(6 + off)) != null) {
String arg = "";
int pc;
if ((pc = var.indexOf(':')) > 0) {
arg = var.substring(pc + 1);
var = var.substring(0, pc);
}
if (var.equals("&") || var.equals("MATCH")) {
head = add(head, new AmpersandRule());
} else if (var.equals("`") || var.equals("PREMATCH")) {
head = add(head, new LeftRule());
} else if (var.equals("'") || var.equals("POSTMATCH")) {
head = add(head, new RightRule());
} else if (var.equals("WANT_MORE_TEXT")) {
head = add(head, new WantMoreTextReplaceRule());
} else if (var.equals("POP")) {
head = add(head, new PopRule());
} else if (var.startsWith("+") && (tmp = defs.get(var.substring(1))) != null) {
if (tmp instanceof Regex) head = add(head, new PushRule(var.substring(1), (Regex) tmp));
else if (tmp instanceof Transformer)
head = add(head, new PushRule(var.substring(1), (Transformer) tmp));
else head = add(head, new StringRule("${" + var + "}"));
} else if (var.startsWith("=") && (tmp = defs.get(var.substring(1))) != null) {
if (tmp instanceof Regex)
head = add(head, new ChangeRule(var.substring(1), (Regex) tmp));
else if (tmp instanceof Transformer)
head = add(head, new ChangeRule(var.substring(1), (Transformer) tmp));
else head = add(head, new StringRule("${" + var + "}"));
} else if ((tmp = defs.get(var)) != null) {
if (tmp instanceof ReplaceRule) {
ReplaceRule alt = ((ReplaceRule) tmp).arg(arg);
if (alt == null) alt = ((ReplaceRule) tmp);
head = add(head, (ReplaceRule) (alt.clone()));
}
} else // can't figure out how to transform this thing...
head = add(head, new StringRule("${" + var + "}"));
} else if ((var = gv.stringMatched(7 + off)) != null) {
char c = var.charAt(0);
if (c == 'n') head = add(head, new StringRule("\n"));
else if (c == 't') head = add(head, new StringRule("\t"));
else if (c == 'r') head = add(head, new StringRule("\r"));
else if (c == 'b') head = add(head, new StringRule("\r"));
else if (c == 'a') head = add(head, new StringRule("" + (char) 7));
else if (c == 'e') head = add(head, new StringRule("" + (char) 27));
else if (c == 'f') head = add(head, new StringRule("" + (char) 12));
} else if ((var = gv.stringMatched(8 + off)) != null) {
char c = var.charAt(0);
if (c < Ctrl.cmap.length) c = Ctrl.cmap[c];
head = add(head, new StringRule("" + c));
} else if ((var = gv.stringMatched(9 + off)) != null) {
int d = 16 * getHexDigit(var.charAt(0)) + getHexDigit(var.charAt(1));
head = add(head, new StringRule("" + (char) d));
}
mt = gv.matchedTo();
}
if (mt <= s.length()) head = add(head, new StringRule(s.substring(mt)));
return head;
} finally {
// Regex.backGs = sav_backGs;
// Regex.backGto = sav_backGto;
}
}