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/**
* An improved D symbol demangler.
*
* Replaces *all* occurrences of mangled D symbols in the input with their
* unmangled form, and writes the result to standard output.
*
* Copyright: Copyright H. S. Teoh 2012.
* License: <a href="http://www.boost.org/LICENSE_1_0.txt">Boost License 1.0</a>.
* Authors: H. S. Teoh
*/
import core.demangle;
import std.algorithm : equal, map;
import std.getopt;
import std.regex;
import std.stdio;
import core.stdc.stdlib;
void showhelp(string[] args)
{
stderr.writef(q"ENDHELP
Usage: %s [options] [<inputfile>]
Demangles all occurrences of mangled D symbols in the input and writes to
standard output.
If <inputfile> is omitted, standard input is read.
Options:
--help, -h Show this help
ENDHELP", args[0]);
exit(1);
}
auto reDemangle = regex(r"\b_?_D[0-9a-zA-Z_]+\b");
const(char)[] demangleMatch(T)(Captures!(T) m)
if (is(T : const(char)[]))
{
/+ If the second character is an underscore, it may be a D symbol with double leading underscore;
+ in that case, try to demangle it with only one leading underscore.
+/
if (m.hit[1] != '_')
{
return demangle(m.hit);
}
else
{
auto result = demangle(m.hit[1..$]);
if (result == m.hit[1..$])
{
// Demangling failed, return original match with (!) double underscore
return m.hit;
}
else
{
return result;
}
}
}
auto ddemangle(T)(T line)
if (is(T : const(char)[]))
{
return replaceAll!(demangleMatch)(line, reDemangle);
}
unittest
{
string[] testData = [
"_D2rt4util7console8__assertFiZv",
"random initial junk _D2rt4util7console8__assertFiZv random trailer",
"multiple _D2rt4util7console8__assertFiZv occurrences _D2rt4util7console8__assertFiZv",
"_D6object9Throwable8toStringMFZAya",
"__D6object9Throwable8toStringMFZAya",
"don't match 3 leading underscores ___D6object9Throwable8toStringMFZAya",
"fail demangling __D6object9Throwable8toStringMFZAy"
];
string[] expected = [
"void rt.util.console.__assert(int)",
"random initial junk void rt.util.console.__assert(int) random trailer",
"multiple void rt.util.console.__assert(int) occurrences void rt.util.console.__assert(int)",
"immutable(char)[] object.Throwable.toString()",
"immutable(char)[] object.Throwable.toString()",
"don't match 3 leading underscores ___D6object9Throwable8toStringMFZAya",
"fail demangling __D6object9Throwable8toStringMFZAy"
];
assert(equal(testData.map!ddemangle(), expected));
}
void main(string[] args)
{
// Parse command-line arguments
try
{
getopt(args,
"help|h", { showhelp(args); },
);
if (args.length > 2) showhelp(args);
}
catch(Exception e)
{
stderr.writeln(e.msg);
stderr.writeln();
showhelp(args);
}
// Process input
try
{
auto f = (args.length==2) ? File(args[1], "r") : stdin;
foreach (line; f.byLine())
writeln(ddemangle(line));
}
catch(Exception e)
{
stderr.writeln(e.msg);
exit(1);
}
}
// vim:set sw=4 ts=4 expandtab: