rename std extensions and clean up imports
This commit is contained in:
+447
@@ -0,0 +1,447 @@
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import "@ffi/c"
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import "@std/meta"
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ReadError :: enum {
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read_failed
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}
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WriteError :: enum {
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write_failed
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no_progress
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}
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Io :: struct {
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context ?*mut anyopaque
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vtable @IoVTable
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}
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IoVTable :: struct {
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read @func(context ?*mut anyopaque, stream ReadStream, buffer []mut u8) usize ! ReadError
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write @func(context ?*mut anyopaque, stream WriteStream, bytes []u8) usize ! WriteError
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}
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ReadStream :: enum(c_int) {
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stdin = 0
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}
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WriteStream :: enum(c_int) {
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stdout = 1
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stderr = 2
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}
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Reader :: struct {
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impl Io
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stream ReadStream
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}
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Writer :: struct {
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impl Io
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stream WriteStream
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}
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read func(reader Reader, buffer []mut u8) usize ! ReadError {
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if buffer.len == 0 {
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return 0
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}
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count usize :: try reader.impl.vtable.read(reader.impl.context, reader.stream, buffer)
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if count > buffer.len {
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return .read_failed
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}
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return count
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}
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write func(writer Writer, bytes []u8) usize ! WriteError {
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if bytes.len == 0 {
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return 0
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}
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count usize :: try writer.impl.vtable.write(writer.impl.context, writer.stream, bytes)
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if count > bytes.len {
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return .write_failed
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}
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return count
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}
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write_all func(writer Writer, bytes []u8) void ! WriteError {
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offset usize = 0
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while offset < bytes.len {
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count usize :: write(writer, bytes[offset..]) catch |err| {
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return err
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}
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if count == 0 {
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return .no_progress
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}
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offset += count
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}
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return
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}
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hide write_integer_signed func(writer Writer, value i64, base u64, uppercase bool) void ! WriteError {
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buffer [65]mut u8 = undefined
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end usize = buffer.len
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current i64 = value
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while true {
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digit_value i64 :: rem!(current, i64(base))
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digit u8 = 0
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if digit_value < 0 {
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digit = u8(-digit_value)
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} else {
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digit = u8(digit_value)
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}
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end -= 1
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if digit < 10 {
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buffer[end] = '0' + digit
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} else if uppercase {
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buffer[end] = 'A' + digit - 10
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} else {
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buffer[end] = 'a' + digit - 10
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}
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current = divtrunc!(current, i64(base))
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if current == 0 {
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break
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}
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}
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if value < 0 {
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end -= 1
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buffer[end] = '-'
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}
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try write_all(writer, buffer[end..])
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return
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}
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hide write_integer_unsigned func(writer Writer, value u64, base u64, uppercase bool) void ! WriteError {
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buffer [65]mut u8 = undefined
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end usize = buffer.len
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current u64 = value
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while true {
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digit u8 :: u8(rem!(current, base))
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end -= 1
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if digit < 10 {
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buffer[end] = '0' + digit
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} else if uppercase {
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buffer[end] = 'A' + digit - 10
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} else {
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buffer[end] = 'a' + digit - 10
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}
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current = divtrunc!(current, base)
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if current == 0 {
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break
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}
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}
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try write_all(writer, buffer[end..])
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return
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}
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hide FormatTokenKind :: enum {
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unused
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literal
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default
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string
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decimal
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binary
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octal
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hex_lower
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hex_upper
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character
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scientific
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}
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hide FormatToken :: struct {
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kind FormatTokenKind
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start usize
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end usize
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field []u8
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}
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hide parse_format func($N usize, $format []u8, $Args type) [N]mut FormatToken {
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tokens [N]mut FormatToken = undefined
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for (usize(0))..format.len |index| {
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tokens[index] = FormatToken {kind = .unused, start = 0, end = 0, field = ""}
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}
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field_count usize = 0
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match typeinfo!(Args) {
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.record |record|: {
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if !record.is_tuple {
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compile_error!("io.print arguments must be a tuple")
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}
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field_count = record.fields.len
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}
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else: compile_error!("io.print arguments must be a tuple")
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}
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token_count usize = 0
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argument_count usize = 0
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literal_start usize = 0
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cursor usize = 0
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while cursor < format.len {
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byte :: format[cursor]
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if byte == '{' {
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if cursor + 1 >= format.len {
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compile_error!("io.print format has an unmatched '{'")
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}
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if cursor > literal_start {
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tokens[token_count] = FormatToken {kind = .literal, start = literal_start, end = cursor, field = ""}
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token_count += 1
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}
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next :: format[cursor + 1]
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if next == '{' {
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tokens[token_count] = FormatToken {kind = .literal, start = cursor, end = cursor + 1, field = ""}
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token_count += 1
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cursor += 2
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literal_start = cursor
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continue
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}
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kind FormatTokenKind = .default
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width usize = 2
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if next != '}' {
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if cursor + 2 >= format.len or format[cursor + 2] != '}' {
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compile_error!("io.print format expects a one-character specifier")
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}
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width = 3
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if next == 's' {
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kind = .string
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} else if next == 'd' {
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kind = .decimal
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} else if next == 'b' {
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kind = .binary
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} else if next == 'o' {
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kind = .octal
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} else if next == 'x' {
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kind = .hex_lower
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} else if next == 'X' {
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kind = .hex_upper
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} else if next == 'c' {
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kind = .character
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} else if next == 'e' {
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kind = .scientific
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} else {
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compile_error!("io.print format has an unknown specifier")
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}
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}
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if argument_count >= field_count {
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compile_error!("io.print format argument count does not match the tuple")
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}
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tokens[token_count] = FormatToken {
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kind = kind,
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start = 0,
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end = 0,
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field = format_field_name(Args, argument_count),
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}
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token_count += 1
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argument_count += 1
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cursor += width
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literal_start = cursor
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continue
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}
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if byte == '}' {
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if cursor + 1 >= format.len or format[cursor + 1] != '}' {
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compile_error!("io.print format has an unmatched '}'")
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}
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if cursor > literal_start {
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tokens[token_count] = FormatToken {kind = .literal, start = literal_start, end = cursor, field = ""}
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token_count += 1
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}
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tokens[token_count] = FormatToken {kind = .literal, start = cursor, end = cursor + 1, field = ""}
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token_count += 1
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cursor += 2
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literal_start = cursor
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continue
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}
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cursor += 1
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}
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if literal_start < format.len {
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tokens[token_count] = FormatToken {kind = .literal, start = literal_start, end = format.len, field = ""}
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}
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if argument_count != field_count {
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compile_error!("io.print format argument count does not match the tuple")
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}
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return tokens
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}
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hide format_field_name func($T type, index usize) []u8 {
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match typeinfo!(T) {
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.record |record|: return record.fields[index].name
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else: compile_error!("io.print arguments must be a tuple")
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}
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}
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hide write_integer func(writer Writer, $T type, value T, base u64, uppercase bool) void ! WriteError {
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match typeinfo!(T) {
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.integer: if minval!(T) < 0 {
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try write_integer_signed(writer, i64(value), base, uppercase)
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} else {
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try write_integer_unsigned(writer, u64(value), base, uppercase)
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}
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else: compile_error!("io.print integer format requires an integer argument")
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}
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return
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}
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# note: libc keeps float formatting small; replace it with a native shortest-roundtrip writer if locale independence matters.
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hide write_float func(writer Writer, $T type, value T, scientific bool) void ! WriteError {
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match typeinfo!(T) {
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.float: {
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buffer [64]mut u8 = undefined
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count c_int = 0
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if sizeof!(T) == 4 {
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if scientific {
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count = c.snprintf(ptrcast!(c_char, (&buffer).ptr), c_ulong(buffer.len), "%.8e", value)
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} else {
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count = c.snprintf(ptrcast!(c_char, (&buffer).ptr), c_ulong(buffer.len), "%.9g", value)
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}
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} else if scientific {
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count = c.snprintf(ptrcast!(c_char, (&buffer).ptr), c_ulong(buffer.len), "%.16e", value)
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} else {
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count = c.snprintf(ptrcast!(c_char, (&buffer).ptr), c_ulong(buffer.len), "%.17g", value)
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}
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if count < 0 or usize(count) >= buffer.len {
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return .write_failed
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}
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try write_all(writer, buffer[0..usize(count)])
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}
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else: compile_error!("io.print float format requires a float argument")
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}
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return
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}
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hide write_decimal func(writer Writer, $T type, value T) void ! WriteError {
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match typeinfo!(T) {
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.integer: try write_integer(writer, value, 10, false)
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.float: try write_float(writer, value, false)
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else: compile_error!("io.print '{d}' requires an integer or float argument")
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}
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return
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}
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hide write_character func(writer Writer, $T type, value T) void ! WriteError {
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match typeinfo!(T) {
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.integer: {
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if minval!(T) < 0 or maxval!(T) > 255 {
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compile_error!("io.print '{c}' requires an unsigned integer that fits in u8")
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}
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buffer [1]u8 = [u8(value)]
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try write_all(writer, buffer[..])
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}
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else: compile_error!("io.print '{c}' requires an unsigned integer that fits in u8")
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}
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return
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}
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hide write_default func(writer Writer, $T type, value T) void ! WriteError {
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match typeinfo!(T) {
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.bool: if value {
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try write_all(writer, "true")
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} else {
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try write_all(writer, "false")
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}
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.integer: try write_integer(writer, value, 10, false)
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.float: try write_float(writer, value, false)
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.array: try write_all(writer, value)
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.pointer: try write_all(writer, value)
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.slice: try write_all(writer, value)
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.enum |enum_info|: {
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inline for enum_info.fields |field| {
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if value == field!(T, field.name) {
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try write_all(writer, ".")
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try write_all(writer, field.name)
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return
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}
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}
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return .write_failed
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}
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else: compile_error!("io.print '{}' does not support this argument type")
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}
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return
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}
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print func(writer Writer, $format []u8, $Args type, args Args) void ! WriteError {
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inline for parse_format(format.len, format, Args) |token| {
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if (token.kind == .unused) {
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break
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}
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if (token.kind == .literal) {
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try write_all(writer, format[token.start..token.end])
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continue
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}
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if (token.kind == .string) {
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try write_all(writer, field!(args, token.field))
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continue
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}
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if (token.kind == .default) {
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try write_default(writer, field!(args, token.field))
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continue
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}
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if (token.kind == .decimal) {
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try write_decimal(writer, field!(args, token.field))
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continue
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}
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if (token.kind == .binary) {
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try write_integer(writer, field!(args, token.field), 2, false)
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continue
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}
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if (token.kind == .octal) {
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try write_integer(writer, field!(args, token.field), 8, false)
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continue
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}
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if (token.kind == .hex_lower) {
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try write_integer(writer, field!(args, token.field), 16, false)
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continue
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}
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if (token.kind == .hex_upper) {
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try write_integer(writer, field!(args, token.field), 16, true)
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continue
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}
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if (token.kind == .character) {
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try write_character(writer, field!(args, token.field))
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continue
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}
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try write_float(writer, field!(args, token.field), true)
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}
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return
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}
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hide system_read func(_ ?*mut anyopaque, stream ReadStream, buffer []mut u8) usize ! ReadError {
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request usize = buffer.len
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maximum usize :: usize(maxval!(c_long))
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if request > maximum {
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request = maximum
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}
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while true {
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count c_long :: c.read(c_int(stream), buffer.ptr, c_ulong(request))
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if count >= 0 {
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return usize(count)
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}
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if c.__error()^ != 4 {
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return .read_failed
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}
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}
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}
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hide system_write func(_ ?*mut anyopaque, stream WriteStream, bytes []u8) usize ! WriteError {
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fd c_int :: c_int(stream)
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request usize = bytes.len
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maximum usize :: usize(maxval!(c_long))
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if request > maximum {
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request = maximum
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}
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while true {
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count c_long :: c.write(fd, bytes.ptr, c_ulong(request))
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if count >= 0 {
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return usize(count)
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}
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if c.__error()^ != 4 {
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return .write_failed
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}
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}
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}
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hide system_vtable IoVTable :: IoVTable {
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read = system_read,
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write = system_write,
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}
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hide system func() Io {
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return Io {
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context = none,
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vtable = &system_vtable,
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}
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}
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