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February 29, 2012 Pretty fields string | ||||
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I've done this a couple of times before but I always had issues, e.g. functions and property calls would be mixed in. But I think I have a good go-to function now: import std.algorithm; import std.conv; import std.string; import std.stdio; import std.range; struct Foo { int one = 1; @property int test() { return 1; } int three = 3; string[string] aa; string toString() { return prettyFieldsString(this); } } string prettyFieldsString(T)(T t) if (is(T == struct) || is(T == class)) { Appender!string result; Appender!(string[]) fields; Appender!(string[]) values; foreach (member; __traits(allMembers, T)) { mixin(" static if (!is( FunctionTypeOf!(t." ~ member ~ ") )) { static if (member != " ~ `"toString"` ~ ") { fields.put(member); values.put(to!string(__traits(getMember, t, " ~ `"` ~ member ~ `"` ~ "))); } } "); } size_t spaceLen = 1; foreach (field; fields.data) // should use reduce!() here.. spaceLen = max(spaceLen, field.length); alias std.array.replicate replicate; string spaceString = replicate(" ", spaceLen); foreach (field, value; lockstep(fields.data, values.data)) result.put(format("%s: %s%s\n", field, replicate(" ", spaceLen - field.length), value)); return result.data; } void main() { Foo foo; foo.aa["foo"] = "bar"; writeln(foo); } Sample output: http://paste.pocoo.org/show/558492/ I've had to put everything into one foreach loop since there are still some CTFE bugs I run into. I also had to add a check against toString, otherwise I get an infinite loop in the toString() call. Anyway, feel free to use/improve this function. |
February 29, 2012 Re: Pretty fields string | ||||
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Posted in reply to Andrej Mitrovic | On 2012-02-29 10:58, Andrej Mitrovic wrote: > I've done this a couple of times before but I always had issues, e.g. > functions and property calls would be mixed in. But I think I have a > good go-to function now: > > import std.algorithm; > import std.conv; > import std.string; > import std.stdio; > import std.range; > > struct Foo > { > int one = 1; > @property int test() { return 1; } > int three = 3; > string[string] aa; > string toString() { return prettyFieldsString(this); } > } > > string prettyFieldsString(T)(T t) > if (is(T == struct) || is(T == class)) > { > Appender!string result; > Appender!(string[]) fields; > Appender!(string[]) values; > > foreach (member; __traits(allMembers, T)) > { > mixin(" > static if (!is( FunctionTypeOf!(t." ~ member ~ ") )) > { > static if (member != " ~ `"toString"` ~ ") > { > fields.put(member); > values.put(to!string(__traits(getMember, t, " ~ `"` ~ > member ~ `"` ~ "))); > } > } > "); > } > > size_t spaceLen = 1; > foreach (field; fields.data) // should use reduce!() here.. > spaceLen = max(spaceLen, field.length); > > alias std.array.replicate replicate; > string spaceString = replicate(" ", spaceLen); > > foreach (field, value; lockstep(fields.data, values.data)) > result.put(format("%s: %s%s\n", field, replicate(" ", spaceLen > - field.length), value)); > > return result.data; > } > > void main() > { > Foo foo; > foo.aa["foo"] = "bar"; > writeln(foo); > } > > Sample output: http://paste.pocoo.org/show/558492/ > > I've had to put everything into one foreach loop since there are still > some CTFE bugs I run into. I also had to add a check against toString, > otherwise I get an infinite loop in the toString() call. > > Anyway, feel free to use/improve this function. Seems like what I have in my serialization library Orange: https://github.com/jacob-carlborg/orange/blob/master/orange/util/Reflection.d "fieldsOf" and "getValueOfField". These work only on instance variables and don't care if the variable is public or not. -- /Jacob Carlborg |
February 29, 2012 Re: Pretty fields string | ||||
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Posted in reply to Jacob Carlborg | On 2/29/12, Jacob Carlborg <doob@me.com> wrote:
> Seems like what I have in my serialization library Orange:
Sweet. I was gonna take a look at Orange for just this purpose. Thanks.
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