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@run-dlang

run-dlang/main.d

Created December 10, 2018 12:33
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  1. run-dlang created this gist Dec 10, 2018.
    88 changes: 88 additions & 0 deletions main.d
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,88 @@
    import std.stdio;

    auto inter(Args...)(Args args)
    {
    import std.conv : to;

    string result = "";
    static foreach (argIndex, argType; Args)
    {
    static if (is(argType : string))
    {
    result ~= args[argIndex];
    }
    else
    {
    result ~= args[argIndex].to!string;
    }
    }
    return result;
    }
    template somefun()
    {
    import std.conv : to;

    static enum State
    {
    start = 0,
    in_var = 1,
    in_literal = 2,
    choice = 3,
    }

    auto iterpolate(string s)()
    {
    return mixin(feach!(s, s.length, State.start));
    }
    string feach(string s, size_t length, State state : State.start)()
    {
    if (s[0] == '$')
    return "inter(" ~ feach!(s[1 .. $], s.length - 1, State.in_var);
    else
    return "inter(\"" ~ feach!(s[0 .. $], s.length, State.in_literal);
    }

    string feach(string s, size_t length, State state : State.choice)()
    {
    if (s[0] == '$')
    return "," ~ feach!(s[1 .. $], s.length - 1, State.in_var);
    else
    return ",\"" ~ feach!(s[0 .. $], s.length, State.in_literal);
    }

    string feach(string s, size_t length, State state : State.in_var)()
    {
    if (s[0] == ' ')
    return feach!(s[0 .. $], s.length, State.choice);
    else
    return s[0] ~ feach!(s[1 .. $], s.length - 1, state);
    }

    string feach(string s, size_t length, State state : State.in_literal)()
    {
    if (s[0] == '$')
    return "\"" ~ feach!(s[0 .. $], s.length, State.choice);
    else
    return s[0] ~ feach!(s[1 .. $], s.length - 1, state);
    }

    string feach(string s, size_t length : 0, State state : State.in_literal)()
    {
    return "\")";
    }

    string feach(string s, size_t length : 0, State state : State.in_var)()
    {
    return ")";
    }
    }

    enum enableInterpolate = "mixin somefun A; alias _ = A.iterpolate;";

    void main()
    {
    mixin(enableInterpolate);
    int a = 5;
    string b = "BIG B";
    _!("Value of a is $a and value of b is $b").writeln;
    }