ref: b319e47808ef74e3ed23a624ac9965551a7f51b5
dir: /lib/std/fmt.myr/
use "alloc.use"
use "chartype.use"
use "die.use"
use "extremum.use"
use "fltfmt.use"
use "hashfuncs.use"
use "hasprefix.use"
use "htab.use"
use "introspect.use"
use "intparse.use"
use "option.use"
use "sleq.use"
use "slpush.use"
use "strbuf.use"
use "strfind.use"
use "strsplit.use"
use "syswrap-ss.use"
use "syswrap.use"
use "types.use"
use "utf.use"
use "varargs.use"
pkg std =
/* write to fd */
const put : (fmt : byte[:], args : ... -> size)
const fput : (fd : fd, fmt : byte[:], args : ... -> size)
const putv : (fmt : byte[:], ap : valist# -> size)
const fputv : (fd : fd, fmt : byte[:], ap : valist# -> size)
/* write to buffer */
const fmt : (fmt : byte[:], args : ... -> byte[:])
const fmtv : (fmt : byte[:], ap : valist# -> byte[:])
const bfmt : (buf : byte[:], fmt : byte[:], args : ... -> byte[:])
const bfmtv : (buf : byte[:], fmt : byte[:], ap : valist# -> byte[:])
/* write to strbuf */
const sbfmt : (buf : strbuf#, fmt : byte[:], args : ... -> size)
const sbfmtv : (buf : strbuf#, fmt : byte[:], ap : valist# -> size)
/* add a formatter function */
const fmtinstall : (ty : byte[:], \
fn : (sb : strbuf#, ap : valist#, opts : (byte[:],byte[:])[:] -> void), \
optdesc : (byte[:], bool)[:] \
-> void)
$noret const fatal : (fmt : byte[:], args : ... -> void)
$noret const fatalv : (fmt : byte[:], ap : valist# -> void)
;;
const __init__ = {
fmtmap = mkht(strhash, streq)
}
type fmtdesc = struct
fn : (sb : strbuf#, ap : valist#, opts : (byte[:],byte[:])[:] -> void)
optdesc : (byte[:], bool)[:]
;;
/* same as 'put', but exits the program after printing */
const fatal = {fmt, args
var ap
ap = vastart(&args)
putv(fmt, &ap)
exit(1)
}
/* same as 'putv', but exits the program after printing */
const fatalv = {fmt, ap
putv(fmt, ap)
exit(1)
}
var fmtmap : htab(byte[:], fmtdesc)#
const fmtinstall = {ty, fn, optdesc
htput(fmtmap, ty, [.fn=fn, .optdesc=optdesc])
}
const put = {fmt, args
var ap
ap = vastart(&args)
-> fputv(1, fmt, &ap)
}
const putv = {fmt, ap
-> fputv(1, fmt, ap)
}
const fput = {fd, fmt, args
var ap
ap = vastart(&args)
-> fputv(fd, fmt, &ap)
}
const fputv = {fd, fmt, ap
var sb, s
sb = mksb()
sbfmtv(sb, fmt, ap)
s = sbfin(sb)
-> writeall(fd, s)
}
const fmt = {fmt, args
var ap
ap = vastart(&args)
-> fmtv(fmt, &ap)
}
const fmtv = {fmt, ap
var sb
sb = mksb()
sbfmtv(sb, fmt, ap)
-> sbfin(sb)
}
const bfmt = {buf, fmt, args
var ap
ap = vastart(&args)
-> bfmtv(buf, fmt, &ap)
}
const bfmtv = {buf, fmt, ap
var sb
sb = mkbufsb(buf)
sbfmtv(sb, fmt, ap)
-> sbfin(sb)
}
const sbfmt = {sb, fmt, args
var ap
ap = vastart(&args)
-> sbfmtv(sb, fmt, &ap)
}
const sbfmtv = {sb, fmt, ap -> size
var nfmt, nparams, pl, orig
var c, params, ty
orig = fmt
nparams = ap.tc.nelt
nfmt = 0
while fmt.len != 0
(c, fmt) = striter(fmt)
match c
| '{':
if decode(fmt) == '{'
(c, fmt) = striter(fmt)
sbputc(sb, '{')
else
(params, fmt) = getparams(fmt)
nfmt++
if nfmt > nparams
die("too few params for fmt\n")
;;
ty = vatype(ap)
match htget(fmtmap, ty)
| `Some f:
pl = parseparams(params, f.optdesc)
f.fn(sb, ap, pl)
std.slfree(pl)
| `None:
fallbackfmt(sb, params, ty, ap)
;;
;;
| '}':
if decode(fmt) == '}'
sbputc(sb, '}')
;;
| chr:
sbputc(sb, chr)
;;
:fmtdone
;;
if nfmt != nparams
write(1, orig)
die("too many params for fmt\n")
;;
-> sb.len
}
const parseparams = {paramstr, optdesc
var params, opts
var o, a, ha : bool, gotarg : bool
opts = [][:]
if optdesc.len == 0 && paramstr.len > 0
std.fatal("invalid format options {}\n")
;;
params = strsplit(paramstr, ",")
for p in params
/* parse out the key/value pair */
match std.strfind(p, "=")
| `std.Some idx:
o = p[:idx]
a = p[idx+1:]
gotarg = true
| `std.None:
o = p
a = ""
gotarg = false
;;
/* verify and add the arg */
for (opt, hasarg) in optdesc
if !std.sleq(opt, o)
continue
;;
ha = hasarg
if ha == gotarg
opts = std.slpush(opts, (o, a))
else
std.fatal("invalid option {}", o)
;;
;;
;;
slfree(params)
-> opts
}
const fallbackfmt = {sb, params, tyenc, ap : valist# -> void
/* value types */
var t_val : bool
var b_val : int8, ub_val : uint8
var w_val : int16, uw_val : uint16
var i_val : int32, ui_val : uint32
var l_val : int64, ul_val : uint64
var z_val : size
var p_val : byte#
var c_val : char
var s_val : byte[:]
var f32_val : flt32, f64_val : flt64
var i8 : int8, i16: int16, i32 : int32
var by : byte
var i : int, i64 : int64
var ui8 : int8, ui16: int16, ui32 : int32
var ui : int, ui64 : int64
match typedesc(tyenc)
| `Tynone: /* nothing */
/* atomic types */
| `Tyvoid:
sbputs(sb, "void")
| `Tybool:
t_val = vanext(ap)
if t_val
sbputs(sb ,"true")
else
sbputs(sb, "false")
;;
| `Tychar:
c_val = vanext(ap)
sbputc(sb, c_val)
| `Tyint8:
b_val = vanext(ap)
intfmt(sb, intparams(params), true, b_val)
| `Tyint16:
w_val = vanext(ap)
intfmt(sb, intparams(params), true, w_val)
| `Tyint:
i_val = vanext(ap)
intfmt(sb, intparams(params), true, i_val)
| `Tyint32:
i_val = vanext(ap)
intfmt(sb, intparams(params), true, i_val)
| `Tyint64:
l_val = vanext(ap)
intfmt(sb, intparams(params), true, l_val)
| `Tybyte:
ub_val = vanext(ap)
intfmt(sb, intparams(params), false, ub_val)
| `Tyuint8:
ub_val = vanext(ap)
intfmt(sb, intparams(params), false, ub_val)
| `Tyuint16:
uw_val = vanext(ap)
intfmt(sb, intparams(params), false, uw_val)
| `Tyuint:
ui_val = vanext(ap)
intfmt(sb, intparams(params), false, ui_val)
| `Tyuint32:
ui_val = vanext(ap)
intfmt(sb, intparams(params), false, ui_val)
| `Tyuint64:
ul_val = vanext(ap)
intfmt(sb, intparams(params), false, ul_val)
| `Tyflt32:
f32_val = vanext(ap)
flt32bfmt(sb, f32_val, MNormal, 0)
| `Tyflt64:
f64_val = vanext(ap)
flt64bfmt(sb, f64_val, MNormal, 0)
| `Tyvalist:
sbputs(sb, "...")
/* compound types */
| `Typtr desc:
p_val = vanext(ap)
sbputs(sb, "0x")
intfmt(sb, \
[.base=16, .padto=2*sizeof(void#), .padfill='0'], \
false, p_val castto(intptr))
| `Tyslice desc:
match typedesc(desc)
| `Tybyte:
s_val = vanext(ap)
strfmt(sb, s_val, params)
| _:
sbputs(sb, "slice[:]")
;;
| `Tyfunc tc:
p_val = vanext(ap)
sbputs(sb, "func{")
intfmt(sb, \
[.base=16, .padto=2*sizeof(void#), .padfill='0'], \
false, p_val castto(intptr))
sbputs(sb, "}")
| `Tyarray (sz, data):
sbputs(sb, "array")
/* aggregate types */
| `Tytuple typecursor:
vabytes(ap)
sbputs(sb, "tuple")
| `Tystruct namecursor:
vabytes(ap)
sbputs(sb, "struct")
| `Tyunion namecursor:
vabytes(ap)
sbputs(sb, "union")
| `Tyname (name, desc):
fallbackfmt(sb, params, desc, ap)
;;
}
const getparams = {fmt
var i
for i = 0; i < fmt.len; i++
if fmt[i] == '}' castto(byte)
goto foundparams
;;
;;
die("invalid format string")
:foundparams
-> (fmt[:i], fmt[i+1:])
}
type intparams = struct
base : size
padto : size
padfill : char
;;
const intparams = {params
var ip : intparams
var opts
ip = [
.base = 10,
.padfill = ' ',
.padto = 0
]
opts = parseparams(params, [
("x", false),
("w", true),
("p", true)][:])
for o in opts
match o
| ("x", ""): ip.base = 16
| ("w", wid): ip.padto = getint(wid, "fmt: width must be integer")
| ("p", pad): ip.padfill = decode(pad)
| _: std.die("unreachable")
;;
;;
std.assert(ip.padto >= 0, "pad must be >= 0")
std.slfree(opts)
-> ip
}
const strfmt = {sb, str, params
var opts
var w, p, i
p = ' '
w = 0
opts = parseparams(params, [
("w", true),
("p", true)][:])
for o in opts
match o
| ("w", wid): w = getint(wid, "fmt: width must be integer")
| ("p", pad): p = decode(pad)
| _: std.die("unreachable")
;;
;;
std.assert(p >= 0, "pad must be >= 0")
std.slfree(opts)
for i = 0; i < w - graphemewidth(str); i++
sbputc(sb, p)
;;
sbputs(sb, str)
}
/*
Hah. like we're going to put in the work to actually
count graphemes.
*/
const graphemewidth = {str
-> str.len
}
const digitchars = [
'0','1','2','3','4',
'5','6','7','8','9',
'a','b','c','d','e','f'
]
generic intfmt = {sb, opts, signed, bits : @a::(integral,numeric)
var isneg
var val
var b : char[32]
var i, j, npad
var base
base = opts.base castto(uint64)
if signed && bits < 0
val = -bits castto(uint64)
isneg = true
else
val = bits castto(uint64)
val &= ~0 >> (8*(sizeof(uint64)-sizeof(@a)))
isneg = false
;;
i = 0
if val == 0
b[0] = '0'
i++
;;
while val != 0
b[i] = digitchars[val % base]
val /= base
i++
;;
npad = clamp(opts.padto - i, 0, opts.padto)
if isneg
npad--
;;
if opts.padfill == '0' && isneg
sbputc(sb, '-')
;;
for j = 0; j < npad; j++
sbputc(sb, opts.padfill)
;;
if opts.padfill != '0' && isneg
sbputc(sb, '-')
;;
for j = i; j != 0; j--
sbputc(sb, b[j - 1])
;;
}
const writeall = {fd, buf
var n, len
len = 0
while true
n = write(fd, buf)
if n <= 0 || n >= len
break
;;
len += n
;;
-> len
}
/* would use std.get(), but that's a dependency loop */
const getint = {s, msg
match std.intparse(s)
| `Some w: -> w;
| `None: die(msg)
;;
}