d/demangle.d

// Copyright (c) 2012-2017, Matt Godbolt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
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//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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import std.stdio;
static import std.demangle;
import std.regex;

auto idRegex = ctRegex!("\\b_?_D[0-9a-zA-Z_]+\\b", "g");

void main() {
    string dem(Captures!(string) m) {
        if (m.hit[1] == '_') {
            // Could be a symbolname with double leading underscore
            auto result = std.demangle.demangle(m.hit[1..$]);
            if (result == m.hit[1..$])
            {
                return m.hit;
            }
            else
            {
                return result;
            }
        }
        else
        {
            return std.demangle.demangle(m.hit);
        }
    }

    foreach (line; stdin.byLine()) {
        string s2 = cast(string)line;
        auto s = replaceAll!(dem)(s2, idRegex);
        writeln(s);
    }
}