Add float utilities, & float formatting with dragonbox

1 files changed, 12 insertions, 7 deletions

diff --git a/asl/format.cpp b/asl/format.cpp
index 6a3e5de..1371431 100644
--- a/asl/format.cpp
+++ b/asl/format.cpp
@@ -106,7 +106,9 @@ void asl::AslFormat(Formatter& f, uint32_t v)
     AslFormat(f, static_cast<uint64_t>(v));

 }

 

-void asl::AslFormat(Formatter& f, uint64_t v)

+static constexpr int32_t kMaxUint64Digits = 20;

+

+asl::string_view asl::format_uint64(uint64_t v, asl::span<char, kMaxUint64Digits> buffer)

 {

     static constexpr char s_pairs_storage[] = {

         '0', '0', '0', '1', '0', '2', '0', '3', '0', '4',

@@ -132,10 +134,7 @@ void asl::AslFormat(Formatter& f, uint64_t v)
     };

 

     static constexpr span s_pairs = s_pairs_storage;

-

-    static constexpr int32_t kMaxDigits = 20;

-    char buffer[kMaxDigits];

-    int32_t cursor = kMaxDigits;

+    int32_t cursor = kMaxUint64Digits;

 

     auto write_two = [&buffer, &cursor](span<const char, 2> str)

     {

@@ -161,13 +160,19 @@ void asl::AslFormat(Formatter& f, uint64_t v)
     {

         write_two(s_pairs.subspan(static_cast<isize_t>(v * 2)).first<2>());

     }

-    else if (v > 0 || cursor == kMaxDigits)

+    else if (v > 0 || cursor == kMaxUint64Digits)

     {

         ASL_ASSERT(v < 10);

         write_one(static_cast<char>('0' + v));

     }

 

-    f.write(string_view(buffer, kMaxDigits).substr(cursor));

+    return string_view(buffer.data(), kMaxUint64Digits).substr(cursor);

+}

+

+void asl::AslFormat(Formatter& f, uint64_t v)

+{

+    char buffer[kMaxUint64Digits];

+    f.write(format_uint64(v, buffer));

 }

 

 void asl::AslFormat(Formatter& f, int8_t v)