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add support for custom format specs using to_format method on object

master
Daniel Kolesa 2015-07-04 18:27:09 +01:00
parent f105729b94
commit 1bf8f7616f
1 changed files with 58 additions and 15 deletions
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73
octa/format.hh
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@ -59,28 +59,29 @@ namespace detail {
* 5 .. decimal
* 6 .. hexadecimal
* 7 .. string
* 8 .. custom object
*/
static constexpr const octa::byte fmt_specs[] = {
/* uppercase spec set */
1, 3, 0, 0, /* A B C D */
1, 1, 1, 0, /* E F G H */
0, 0, 0, 0, /* I J K L */
0, 0, 0, 0, /* M N O P */
0, 0, 0, 0, /* Q R S T */
0, 0, 0, 6, /* U V W X */
0, 0, /* Y Z */
1, 3, 8, 8, /* A B C D */
1, 1, 1, 8, /* E F G H */
8, 8, 8, 8, /* I J K L */
8, 8, 8, 8, /* M N O P */
8, 8, 8, 8, /* Q R S T */
8, 8, 8, 6, /* U V W X */
8, 8, /* Y Z */
/* ascii filler */
0, 0, 0, 0, 0, 0,
/* lowercase spec set */
1, 3, 2, 5, /* a b c d */
1, 1, 1, 0, /* e f g h */
0, 0, 0, 0, /* i j k l */
0, 0, 4, 0, /* m n o p */
0, 0, 7, 0, /* q r s t */
0, 0, 0, 6, /* u v w x */
0, 0, /* y z */
1, 1, 1, 8, /* e f g h */
8, 8, 8, 8, /* i j k l */
8, 8, 4, 8, /* m n o p */
8, 8, 7, 8, /* q r s t */
8, 8, 8, 6, /* u v w x */
8, 8, /* y z */
/* ascii filler */
0, 0, 0, 0, 0
@ -345,7 +346,7 @@ namespace detail {
char spec = fl->spec;
if (spec == 's') spec = 'd';
octa::byte specn = octa::detail::fmt_specs[spec - 65];
if (specn <= 2) {
if (specn <= 2 || specn > 7) {
assert(false && "cannot format integers with the given spec");
return -1;
}
@ -502,6 +503,37 @@ namespace detail {
return ret;
}
template<typename R>
struct FmtWriteRange: octa::OutputRange<FmtWriteRange<R>, char> {
FmtWriteRange() = delete;
FmtWriteRange(R &out): p_out(out), p_written(0) {}
bool put(char v) {
bool ret = p_out.put(v);
p_written += ret;
return ret;
}
octa::Size put_n(const char *v, octa::Size n) {
octa::Size ret = p_out.put_n(v, n);
p_written += ret;
return ret;
}
octa::Size get_written() const { return p_written; }
private:
R &p_out;
octa::Size p_written;
};
template<typename T, typename U>
struct FmtTofmtTest {
template<typename TT, typename UU,
bool (TT::*)(UU &, const FormatSpec &) const
> struct Test {};
template<typename TT, typename UU>
static char test(Test<TT, UU, &TT::template to_format<UU>> *);
template<typename, typename> static int test(...);
static constexpr bool value = (sizeof(test<T, U>(0)) == sizeof(char));
};
struct WriteSpec: octa::FormatSpec {
WriteSpec(): octa::FormatSpec() {}
WriteSpec(const char *fmt): octa::FormatSpec(fmt) {}
@ -652,7 +684,8 @@ namespace detail {
/* generic value */
template<typename R, typename T>
octa::Ptrdiff write(R &writer, const T &val, octa::EnableIf<
!octa::IsArithmetic<T>::value && FmtTostrTest<T>::value, bool
!octa::IsArithmetic<T>::value && FmtTostrTest<T>::value &&
!FmtTofmtTest<T, FmtWriteRange<R>>::value, bool
> = true) {
if (this->spec != 's') {
assert(false && "custom objects need '%s' format");
@ -661,6 +694,16 @@ namespace detail {
return write(writer, octa::to_string(val));
}
/* custom format case */
template<typename R, typename T>
octa::Ptrdiff write(R &writer, const T &val, octa::EnableIf<
FmtTofmtTest<T, FmtWriteRange<R>>::value, bool
> = true) {
FmtWriteRange<R> sink(writer);
if (!val.to_format(sink, *this)) return -1;
return sink.get_written();
}
/* generic failure case */
template<typename R, typename T>
octa::Ptrdiff write(R &, const T &, octa::EnableIf<