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traits.d
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traits.d
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/++
+ Various traits that are too kameloso-specific to be in `lu`.
+/
module kameloso.traits;
import lu.traits : isConfigurableVariable;
import lu.uda : Hidden, Unconfigurable;
import std.traits : isArray, isAssociativeArray, isType;
import std.typecons : Flag, No, Yes;
// longestMemberNameImpl
/++
+ Gets the name of the longest member in one or more struct/class objects.
+
+ This is used for formatting terminal output of objects, so that columns line up.
+
+ Params:
+ all = Flag of whether to display all members, or only those not hidden.
+ Things = Types to introspect and count member name lengths of.
+/
private template longestMemberNameImpl(Flag!"all" all, Things...)
if (Things.length > 0)
{
enum longestMemberNameImpl = ()
{
import std.meta : Alias;
import std.traits : hasUDA;
string longest;
foreach (Thing; Things)
{
foreach (immutable name; __traits(allMembers, Thing))
{
alias member = Alias!(__traits(getMember, Thing, name));
static if (!isType!member &&
isConfigurableVariable!member &&
!hasUDA!(member, Hidden) &&
(all || !hasUDA!(member, Unconfigurable)))
{
if (name.length > longest.length)
{
longest = name;
}
}
}
}
return longest;
}();
}
// longestMemberName
/++
+ Gets the name of the longest configurable member in one or more structs.
+
+ This is used for formatting terminal output of configuration files, so that
+ columns line up.
+
+ Params:
+ Things = Types to introspect and count member name lengths of.
+/
alias longestMemberName(Things...) = longestMemberNameImpl!(No.all, Things);
///
unittest
{
struct Foo
{
string veryLongName;
int i;
@Unconfigurable string veryVeryVeryLongNameThatIsInvalid;
@Hidden float likewiseWayLongerButInvalid;
}
struct Bar
{
string evenLongerName;
float f;
@Unconfigurable
@Hidden
long looooooooooooooooooooooong;
}
static assert(longestMemberName!Foo == "veryLongName");
static assert(longestMemberName!Bar == "evenLongerName");
static assert(longestMemberName!(Foo, Bar) == "evenLongerName");
}
// longestUnconfigurableMemberName
/++
+ Gets the name of the longest member in one or more structs, including
+ `lu.uda.Unconfigurable` ones.
+
+ This is used for formatting terminal output of objects, so that columns line up.
+
+ Params:
+ Things = Types to introspect and count member name lengths of.
+/
alias longestUnconfigurableMemberName(Things...) = longestMemberNameImpl!(Yes.all, Things);
///
unittest
{
struct Foo
{
string veryLongName;
int i;
@Unconfigurable string veryVeryVeryLongNameThatIsValidNow;
@Hidden float likewiseWayLongerButInvalidddddddddddddddddddddddddddddd;
}
struct Bar
{
string evenLongerName;
float f;
@Unconfigurable
@Hidden
long looooooooooooooooooooooong;
}
static assert(longestUnconfigurableMemberName!Foo == "veryVeryVeryLongNameThatIsValidNow");
static assert(longestUnconfigurableMemberName!Bar == "evenLongerName");
static assert(longestUnconfigurableMemberName!(Foo, Bar) == "veryVeryVeryLongNameThatIsValidNow");
}
// longestMemberTypeNameImpl
/++
+ Gets the name of the longest type of a member in one or more structs.
+
+ This is used for formatting terminal output of objects, so that columns line up.
+
+ Params:
+ all = Whether to consider all members or only those not hidden or unconfigurable.
+ Things = Types to introspect and count member type name lengths of.
+/
private template longestMemberTypeNameImpl(Flag!"all" all, Things...)
if (Things.length > 0)
{
enum longestMemberTypeNameImpl = ()
{
import std.meta : Alias;
import std.traits : hasUDA;
string longest;
foreach (Thing; Things)
{
foreach (immutable i, immutable name; __traits(allMembers, Thing))
{
alias member = Alias!(__traits(getMember, Thing, name));
static if (!isType!member &&
isConfigurableVariable!member &&
!hasUDA!(member, Hidden) &&
(all || !hasUDA!(member, Unconfigurable)))
{
alias T = typeof(__traits(getMember, Thing, name));
import lu.traits : isTrulyString;
static if (!isTrulyString!T && (isArray!T || isAssociativeArray!T))
{
import lu.traits : UnqualArray;
enum typestring = UnqualArray!T.stringof;
}
else
{
import std.traits : Unqual;
enum typestring = Unqual!T.stringof;
}
if (typestring.length > longest.length)
{
longest = typestring;
}
}
}
}
return longest;
}();
}
// longestMemberTypeName
/++
+ Gets the name of the longest type of a member in one or more structs.
+
+ This is used for formatting terminal output of configuration files, so that
+ columns line up.
+
+ Params:
+ Things = Types to introspect and count member type name lengths of.
+/
alias longestMemberTypeName(Things...) = longestMemberTypeNameImpl!(No.all, Things);
///
unittest
{
struct S1
{
string s;
char[][string] css;
@Unconfigurable string[][string] ss;
}
enum longestConfigurable = longestMemberTypeName!S1;
assert((longestConfigurable == "char[][string]"), longestConfigurable);
}
// longestUnconfigurableMemberTypeName
/++
+ Gets the name of the longest type of a member in one or more structs.
+
+ This is used for formatting terminal output of state objects, so that
+ columns line up.
+
+ Params:
+ Things = Types to introspect and count member type name lengths of.
+/
alias longestUnconfigurableMemberTypeName(Things...) = longestMemberTypeNameImpl!(Yes.all, Things);
///
unittest
{
struct S1
{
string s;
char[][string] css;
@Unconfigurable string[][string] ss;
}
enum longestUnconfigurable = longestUnconfigurableMemberTypeName!S1;
assert((longestUnconfigurable == "string[][string]"), longestUnconfigurable);
}