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Add io.write_quoted_* utility procedures to package io
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gingerBill
@@ -2,6 +2,7 @@ package io
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import "core:mem"
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import "core:strconv"
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import "core:unicode/utf8"
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read_ptr :: proc(r: Reader, p: rawptr, byte_size: int) -> (n: int, err: Error) {
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@@ -38,6 +39,158 @@ write_int :: proc(w: Writer, i: int, base: int = 10) -> (n: int, err: Error) {
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return write_i64(w, i64(i), base)
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}
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@(private="file")
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DIGITS_LOWER := "0123456789abcdefx"
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@(private="file")
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n_write_byte :: proc(w: Writer, b: byte, bytes_processed: ^int) -> Error {
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err := write_byte(w, b)
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if err == nil {
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bytes_processed^ += 1
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}
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return err
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}
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n_wrapper :: proc(n: int, err: Error, bytes_processed: ^int) -> Error {
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bytes_processed^ += n
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return err
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}
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write_encoded_rune :: proc(w: Writer, r: rune, write_quote := true) -> (n: int, err: Error) {
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if write_quote {
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n_write_byte(w, '\'', &n) or_return
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}
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switch r {
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case '\a': n_wrapper(write_string(w, `\a"`), &n) or_return
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case '\b': n_wrapper(write_string(w, `\b"`), &n) or_return
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case '\e': n_wrapper(write_string(w, `\e"`), &n) or_return
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case '\f': n_wrapper(write_string(w, `\f"`), &n) or_return
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case '\n': n_wrapper(write_string(w, `\n"`), &n) or_return
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case '\r': n_wrapper(write_string(w, `\r"`), &n) or_return
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case '\t': n_wrapper(write_string(w, `\t"`), &n) or_return
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case '\v': n_wrapper(write_string(w, `\v"`), &n) or_return
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case:
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if r < 32 {
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n_wrapper(write_string(w, `\x`), &n) or_return
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buf: [2]byte
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s := strconv.append_bits(buf[:], u64(r), 16, true, 64, strconv.digits, nil)
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switch len(s) {
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case 0: n_wrapper(write_string(w, "00"), &n) or_return
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case 1: n_write_byte(w, '0', &n) or_return
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case 2: n_wrapper(write_string(w, s), &n) or_return
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}
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} else {
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n_wrapper(write_rune(w, r), &n) or_return
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}
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}
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if write_quote {
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n_write_byte(w, '\'', &n) or_return
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}
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return
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}
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write_escaped_rune :: proc(w: Writer, r: rune, quote: byte, html_safe := false) -> (n: int, err: Error) {
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is_printable :: proc(r: rune) -> bool {
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if r <= 0xff {
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switch r {
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case 0x20..=0x7e:
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return true
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case 0xa1..=0xff: // ¡ through ÿ except for the soft hyphen
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return r != 0xad //
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}
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}
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// TODO(bill): A proper unicode library will be needed!
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return false
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}
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if html_safe {
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switch r {
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case '<', '>', '&':
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, 'u', &n) or_return
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for s := 12; s >= 0; s -= 4 {
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n_write_byte(w, DIGITS_LOWER[r>>uint(s) & 0xf], &n) or_return
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}
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return
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}
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}
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if r == rune(quote) || r == '\\' {
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, byte(r), &n) or_return
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return
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} else if is_printable(r) {
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n_wrapper(write_encoded_rune(w, r, false), &n) or_return
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return
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}
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switch r {
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case '\a': n_wrapper(write_string(w, `\a`), &n) or_return
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case '\b': n_wrapper(write_string(w, `\b`), &n) or_return
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case '\e': n_wrapper(write_string(w, `\e`), &n) or_return
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case '\f': n_wrapper(write_string(w, `\f`), &n) or_return
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case '\n': n_wrapper(write_string(w, `\n`), &n) or_return
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case '\r': n_wrapper(write_string(w, `\r`), &n) or_return
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case '\t': n_wrapper(write_string(w, `\t`), &n) or_return
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case '\v': n_wrapper(write_string(w, `\v`), &n) or_return
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case:
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switch c := r; {
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case c < ' ':
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, 'x', &n) or_return
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n_write_byte(w, DIGITS_LOWER[byte(c)>>4], &n) or_return
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n_write_byte(w, DIGITS_LOWER[byte(c)&0xf], &n) or_return
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case c > utf8.MAX_RUNE:
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c = 0xfffd
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fallthrough
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case c < 0x10000:
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, 'u', &n) or_return
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for s := 12; s >= 0; s -= 4 {
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n_write_byte(w, DIGITS_LOWER[c>>uint(s) & 0xf], &n) or_return
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}
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case:
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, 'U', &n) or_return
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for s := 28; s >= 0; s -= 4 {
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n_write_byte(w, DIGITS_LOWER[c>>uint(s) & 0xf], &n) or_return
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}
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}
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}
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return
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}
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write_quoted_string :: proc(w: Writer, str: string, quote: byte = '"') -> (n: int, err: Error) {
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n_write_byte(w, quote, &n) or_return
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for width, s := 0, str; len(s) > 0; s = s[width:] {
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r := rune(s[0])
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width = 1
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if r >= utf8.RUNE_SELF {
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r, width = utf8.decode_rune_in_string(s)
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}
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if width == 1 && r == utf8.RUNE_ERROR {
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n_write_byte(w, '\\', &n) or_return
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n_write_byte(w, 'x', &n) or_return
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n_write_byte(w, DIGITS_LOWER[s[0]>>4], &n) or_return
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n_write_byte(w, DIGITS_LOWER[s[0]&0xf], &n) or_return
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continue
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}
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n_wrapper(write_escaped_rune(w, r, quote), &n) or_return
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}
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n_write_byte(w, quote, &n) or_return
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return
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}
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Tee_Reader :: struct {
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r: Reader,
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w: Writer,
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