[Issue 5236] New: [patch] std.format.formattedRead/unformatValue does not support the raw reading of integer types

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5236

           Summary: [patch] std.format.formattedRead/unformatValue does
                    not support the raw reading of integer types
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: patch
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: sandford at jhu.edu


--- Comment #0 from Rob Jacques <sandford at jhu.edu> 2010-11-18 11:35:40 PST ---
The raw value reading code was never duplicated in the isIntegral version of
unformatValue. Given the amount of code overlap for raw value reading, I'd
recommend a re-factor of the unformatValue, but in the mean time, here is a
patch and unit test.

Unit test:
    union B
    {
        char[int.sizeof] untyped;
        int typed;
    };
    B b;
    b.typed = 5;
    char[] input = b.untyped[];
    int witness;
    formattedRead(input, "%r", &witness);
    assert(witness == b.typed);

Patch:
/**
   Reads an integral value and returns it.
 */
T unformatValue(T, Range, Char)(ref Range input, ref FormatSpec!Char spec)
if (isIntegral!T && isInputRange!Range)
{
    if (spec.spec == 'r')
    {
        // raw read
        //enforce(input.length >= T.sizeof);
        enforce(isSomeString!Range || ElementType!(Range).sizeof == 1);
        union X
        {
            ubyte[T.sizeof] raw;
            T typed;
        }
        X x;
        foreach (i; 0 .. T.sizeof)
        {
            static if (isSomeString!Range)
            {
                x.raw[i] = input[0];
                input = input[1 .. $];
            }
            else
            {
                // TODO: recheck this
                x.raw[i] = cast(ubyte) input.front;
                input.popFront();
            }
        }
        return x.typed;
    }
    enforce(std.algorithm.find("cdosuxX", spec.spec).length,
            text("Wrong integral type specifier: `", spec.spec, "'"));
    if (std.algorithm.find("dsu", spec.spec).length)
    {
        return parse!T(input);
    }
    assert(0, "Parsing spec '"~spec.spec~"' not implemented.");
}

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