summaryrefslogtreecommitdiff
path: root/lib/nes/common/string-builder.cc
diff options
context:
space:
mode:
Diffstat (limited to 'lib/nes/common/string-builder.cc')
-rw-r--r--lib/nes/common/string-builder.cc256
1 files changed, 0 insertions, 256 deletions
diff --git a/lib/nes/common/string-builder.cc b/lib/nes/common/string-builder.cc
deleted file mode 100644
index 7747aaa..0000000
--- a/lib/nes/common/string-builder.cc
+++ /dev/null
@@ -1,256 +0,0 @@
-#include "nes/common/string-builder.hh"
-
-namespace nes
-{
- string_builder::string_builder(span<char> const buffer)
- : buffer_{ buffer }
- {
- }
-
- auto string_builder::append_char(char const value) -> status
- {
- if (length_ == buffer_.get_length()) { return status::error_buffer_overflow; }
-
- buffer_[length_] = value;
- length_ += 1;
- return status::success;
- }
-
- auto string_builder::append_string(std::string_view const value) -> status
- {
- auto copy = *this;
- for (auto const c : value)
- {
- if (auto const s = copy.append_char(c); s != status::success) { return s; }
- }
-
- *this = copy;
- return status::success;
- }
-
- auto string_builder::append_int(i64 value, number_format const format) -> status
- {
- auto copy = *this;
- if (value < 0)
- {
- if (auto const s = copy.append_char('-'); s != status::success) { return s; }
- value += 1; // to prevent lossy conversion to unsigned
- auto abs_value = static_cast<u64>(-value);
- abs_value += 1; // to correct the previous offset
- if (auto const s = copy.append_int(abs_value, format); s != status::success) { return s; }
- }
- else
- {
- if (auto const s = copy.append_int(static_cast<u64>(value), format); s != status::success) { return s; }
- }
-
- *this = copy;
- return status::success;
- }
-
- auto string_builder::append_int(u64 value, number_format const format) -> status
- {
- constexpr auto max_string_length = u32{ 64 }; // worst case is a 64-bit integer in binary representation
- constexpr auto digits = "0123456789abcdef";
-
- auto copy = *this;
- auto base = u64{ 10 };
- auto prefix = "";
- switch (format)
- {
- case number_format::binary:
- prefix = "0b";
- base = 2;
- break;
- case number_format::octal:
- prefix = "0";
- base = 8;
- break;
- case number_format::decimal:
- break;
- case number_format::hexadecimal:
- prefix = "0x";
- base = 16;
- break;
- }
- if (auto const s = copy.append_string(prefix); s != status::success) { return s; }
-
- char buf[max_string_length + 1] = {}; // null-terminated
- auto pos = max_string_length;
- // Go through each digit in reverse order by continuously dividing the integer by the base.
- while (value)
- {
- pos--;
-
- buf[pos] = digits[value % base]; // Convert digit to char representation
- value /= base;
- }
- if (pos == max_string_length)
- {
- // Special case 0 would not print any character otherwise.
- pos--;
- buf[pos] = '0';
- }
-
- if (const auto s = copy.append_string(&buf[pos]); s != status::success) { return s; }
-
- *this = copy;
- return status::success;
- }
-
- auto string_builder::append_bool(bool const value) -> status
- {
- return append_string(value ? "true" : "false");
- }
-
- auto string_builder::append_format(std::string_view const fmt, format_arg const* args, u32 const arg_count) -> status
- {
- auto copy = *this;
-
- // Go through the format string, inserting the arguments for the templates as necessary.
- auto current_arg = u32{ 0 };
- for (auto i = u32{ 0 }; i < fmt.length(); ++i)
- {
- if (fmt[i] == '{')
- {
- i += 1;
-
- if (fmt[i] == '{') {
- // escaped '{'
- if (auto const s = copy.append_char('{'); s != status::success) { return s; }
- }
- else
- {
- // start of template
- auto const params = &fmt[i]; // remember start position
- auto params_length = u32{ 0 };
- // skip to the end of the template
- while (fmt[i] && fmt[i] != '}')
- {
- params_length++;
- i++;
- }
- if (fmt[i] != '}')
- {
- // unmatched '{'
- return status::error_invalid_format_string;
- }
-
- // end of template
- auto const p = std::string_view{ params, params_length };
- if (current_arg < arg_count)
- {
- if (auto const s = copy.append_format_arg(args[current_arg], p); s != status::success) { return s; }
- current_arg += 1;
- }
- else
- {
- // missing argument in parameter pack
- return status::error_invalid_format_string;
- }
- }
- }
- else if (fmt[i] == '}')
- {
- i += 1;
-
- if (fmt[i] == '}')
- {
- // escaped '}'
- if (auto const s = copy.append_char('}'); s != status::success) { return s; }
- }
- else
- {
- // unmatched '}'
- return status::error_invalid_format_string;
- }
- }
- else
- {
- // normal character in the template string
- if (auto const s = copy.append_char(fmt[i]); s != status::success) { return s; }
- }
- }
-
- if (current_arg < arg_count)
- {
- // not all supplied arguments were used
- return status::error_invalid_format_string;
- }
-
- *this = copy;
- return status::success;
- }
-
- auto string_builder::append_format_arg(format_arg const arg, std::string_view const params) -> status
- {
- auto const parse_params = [&]
- {
- if (!params.empty())
- {
- return status::error_invalid_format_string;
- }
-
- return status::success;
- };
-
- auto const parse_params_integer = [&](number_format& out_format)
- {
- if (params.empty() || params == "d")
- {
- out_format = number_format::decimal;
- }
- else if (params == "x")
- {
- out_format = number_format::hexadecimal;
- }
- else if (params == "o")
- {
- out_format = number_format::octal;
- }
- else if (params == "b")
- {
- out_format = number_format::binary;
- }
- else
- {
- return status::error_invalid_format_string;
- }
-
- return status::success;
- };
-
- switch (arg.type)
- {
- case format_arg_type::string:
- {
- if (auto const s = parse_params(); s != status::success) { return s; }
- return append_string(arg.string);
- }
- case format_arg_type::character:
- {
- if (auto const s = parse_params(); s != status::success) { return s; }
- return append_char(arg.character);
- }
- case format_arg_type::signed_integer:
- {
- auto format = number_format{};
- if (auto const s = parse_params_integer(format); s != status::success) { return s; }
- return append_int(arg.signed_integer, format);
- }
- case format_arg_type::unsigned_integer:
- {
- auto format = number_format{};
- if (auto const s = parse_params_integer(format); s != status::success) { return s; }
- return append_int(arg.unsigned_integer, format);
- }
- case format_arg_type::boolean:
- {
- if (auto const s = parse_params(); s != status::success) { return s; }
- return append_bool(arg.character);
- }
- }
-
- return status::error_invalid_format_string;
- }
-} // namespace nes \ No newline at end of file
generated by cgit v1.3.1 (git 2.54.0) at 2026-11-10 11:23:51 +0000