408 lines
10 KiB
Plaintext
408 lines
10 KiB
Plaintext
import "@ffi/c"
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import "@std/meta"
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ReadError :: enum {
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not_open_for_reading
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read_failed
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}
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WriteError :: enum {
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not_open_for_writing
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write_failed
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no_progress
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}
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Handle :: union {
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file_desc c_int
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ptr @mut anyopaque
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}
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Stream :: enum(c_int) {
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stdin = c.STDIN_FILENO
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stdout = c.STDOUT_FILENO
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stderr = c.STDERR_FILENO
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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, handle Handle, buffer []mut u8) usize ! ReadError
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write @func(context ?@mut anyopaque, handle Handle, bytes []u8) usize ! WriteError
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open @func(context ?@mut anyopaque, path [;0]u8, mode FileMode) Handle ! OpenError
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close @func(context ?@mut anyopaque, handle Handle) void ! CloseError
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stdin @func(context ?@mut anyopaque) Handle
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stdout @func(context ?@mut anyopaque) Handle
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stderr @func(context ?@mut anyopaque) Handle
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}
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Reader :: struct {
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context ?@mut anyopaque
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handle Handle
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read @func(context ?@mut anyopaque, handle Handle, buffer []mut u8) usize ! ReadError
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}
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Writer :: struct {
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context ?@mut anyopaque
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handle Handle
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write @func(context ?@mut anyopaque, handle Handle, bytes []u8) usize ! WriteError
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}
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read func(input 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 input.read(input.context, input.handle, 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(output 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 output.write(output.context, output.handle, 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(output 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(output, 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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stdin func(io Io) Reader {
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return Reader {
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context = io.context,
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handle = io.vtable.stdin(io.context),
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read = io.vtable.read,
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}
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}
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stdout func(io Io) Writer {
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return Writer {
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context = io.context,
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handle = io.vtable.stdout(io.context),
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write = io.vtable.write,
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}
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}
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stderr func(io Io) Writer {
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return Writer {
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context = io.context,
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handle = io.vtable.stderr(io.context),
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write = io.vtable.write,
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}
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}
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print func(output Writer, $format []u8, $Args type, args Args) void ! WriteError {
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expand for parse_format(format.len, format, Args) |token| {
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match token.kind {
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.unused: break
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.literal: try write_all(output, format[token.start..token.end])
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.string: try write_all(output, field!(args, token.field))
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.default: try write_default(output, field!(args, token.field))
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.decimal: try write_decimal(output, field!(args, token.field))
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.binary: try write_integer(output, field!(args, token.field), 2, false)
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.octal: try write_integer(output, field!(args, token.field), 8, false)
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.hex_lower: try write_integer(output, field!(args, token.field), 16, false)
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.hex_upper: try write_integer(output, field!(args, token.field), 16, true)
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.character: try write_character(output, field!(args, token.field))
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else: try write_float(output, field!(args, token.field), true)
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}
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}
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}
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hide write_integer_signed func(output 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(output, buffer[end..])
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return
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}
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hide write_integer_unsigned func(output 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(output, 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(output 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(output, i64(value), base, uppercase)
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} else {
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try write_integer_unsigned(output, 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(output 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(output, 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(output Writer, $T type, value T) void ! WriteError {
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match typeinfo!(T) {
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.integer: try write_integer(output, value, 10, false)
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.float: try write_float(output, 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(output 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(output, 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(output 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(output, "true")
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} else {
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try write_all(output, "false")
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}
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.integer: try write_integer(output, value, 10, false)
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.float: try write_float(output, value, false)
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.array: try write_all(output, value)
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.pointer: try write_all(output, value)
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.slice: try write_all(output, value)
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.enum |enum_info|: {
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expand for enum_info.fields |field| {
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if value == field!(T, field.name) {
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try write_all(output, ".")
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try write_all(output, 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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