ref: b5bfee96de8a7fae9bdda140f630bea0b5997737
dir: /lib/std/fmt.myr/
use "alloc"
use "consts"
use "chartype"
use "die"
use "extremum"
use "fltfmt"
use "hashfuncs"
use "hasprefix"
use "htab"
use "intparse"
use "introspect"
use "memops"
use "option"
use "result"
use "sldup"
use "slpush"
use "sleq"
use "strbuf"
use "strfind"
use "striter"
use "strsplit"
use "syswrap"
use "syswrap-ss"
use "traits"
use "types"
use "utf"
use "varargs"
use "writeall"
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) \
-> void)
$noret const fatal : (fmt : byte[:], args : ... -> void)
$noret const fatalv : (fmt : byte[:], ap : valist# -> void)
;;
type parsestate = union
`Copy
`ParamOpt
`ParamArg
;;
const __init__ = {
fmtmap = mkht()
}
type fmtdesc = struct
fn : (sb : strbuf#, ap : valist#, opts : (byte[:],byte[:])[:] -> void)
;;
/* same as 'put', but exits the program after printing */
const fatal = {fmt, args
var ap
ap = vastart(&args)
fputv(Err, fmt, &ap)
exit(1)
}
/* same as 'putv', but exits the program after printing */
const fatalv = {fmt, ap
fputv(Err, fmt, ap)
exit(1)
}
var fmtmap : htab(byte[:], fmtdesc)#
const fmtinstall = {ty, fn
match std.htget(fmtmap, ty)
| `std.Some _: std.fatal("doubly installed format\n")
| `std.None: htput(fmtmap, ty, [.fn=fn])
;;
}
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, nw
sb = mksb()
sbfmtv(sb, fmt, ap)
s = sbfin(sb)
match writeall(fd, s)
| `std.Ok n: nw += n
| `std.Err (n, _): nw += n
;;
slfree(s)
-> nw
}
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 buf : byte[256], param : (byte[:], byte[:])[8]
var state, startp, endp, starta, nbuf
var nfmt, nvarargs, nparam
var b, i
nvarargs = ap.tc.nelt
nfmt = 0
startp = 0
starta = 0
nparam = 0
nbuf = 0
endp = 0
state = `Copy
i = 0
while i != fmt.len
b = fmt[i++]
match (state, (b : char))
/* raw bytes */
| (`Copy, '{'):
if nfmt > nvarargs
die("too few values for fmt\n")
;;
if (fmt[i] : char) == '{'
b = fmt[i++]
sbputb(sb, ('{' : byte))
else
state = `ParamOpt
nparam = 0
startp = 0
starta = 0
nbuf = 0
;;
| (`Copy, '}'):
if i == fmt.len || (fmt[i] : char) != '}'
die("unescaped '}'\n")
;;
sbputb(sb, ('}' : byte))
i++
| (`Copy, _):
sbputb(sb, b)
/* {param */
| (`ParamOpt, '='):
state = `ParamArg
endp = nbuf
starta = nbuf
| (`ParamOpt, ','):
if startp != nbuf
param[nparam++] = (buf[startp:nbuf], "")
;;
| (`ParamOpt, '}'):
state = `Copy
if startp != nbuf
param[nparam++] = (buf[startp:nbuf], "")
;;
fmtval(sb, vatype(ap), ap, param[:nparam])
nfmt++
| (`ParamOpt, '\\'):
buf[nbuf++] = fmt[i++]
| (`ParamOpt, chr):
buf[nbuf++] = b
/* {param=arg} */
| (`ParamArg, ','):
state = `ParamOpt
param[nparam++] = (buf[startp:endp], buf[starta:nbuf])
startp = nbuf
endp = nbuf
| (`ParamArg, '}'):
state = `Copy
if startp != nbuf
param[nparam++] = (buf[startp:endp], buf[starta:nbuf])
;;
fmtval(sb, vatype(ap), ap, param[:nparam])
nfmt++
| (`ParamArg, '\\'):
buf[nbuf++] = fmt[i++]
| (`ParamArg, chr):
buf[nbuf++] = b
;;
;;
if nfmt != nvarargs
die("too many values for fmt\n")
;;
-> sb.len
}
const fmtval = {sb, ty, ap, params
match htget(fmtmap, ty)
| `Some f:
f.fn(sb, ap, params)
| `None:
fallbackfmt(sb, params, ty, ap)
;;
}
const fallbackfmt = {sb, params, tyenc, ap : valist# -> void
/* value types */
var subap, subenc, subname
var inf, p
match typedesc(tyenc)
/* shows up in a union with no body */
| `Tynone:
/* atomic types */
| `Tyvoid:
var val : void = vanext(ap)
sbputs(sb, "void")
| `Tybool:
var val : bool = vanext(ap)
if val
sbputs(sb ,"true")
else
sbputs(sb, "false")
;;
| `Tychar:
var val : char = vanext(ap)
sbputc(sb, val)
| `Tyint8:
var val : int8 = vanext(ap)
intfmt(sb, intparams(params), true, (val : uint64), 8)
| `Tyint16:
var val : int16 = vanext(ap)
intfmt(sb, intparams(params), true, (val : uint64), 16)
| `Tyint:
var val : int = vanext(ap)
intfmt(sb, intparams(params), true, (val : uint64), 32)
| `Tyint32:
var val : int32 = vanext(ap)
intfmt(sb, intparams(params), true, (val : uint64), 32)
| `Tyint64:
var val : int64 = vanext(ap)
intfmt(sb, intparams(params), true, (val : uint64), 64)
| `Tybyte:
var val : byte = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 8)
| `Tyuint8:
var val : uint8 = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 8)
| `Tyuint16:
var val : uint16 = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 16)
| `Tyuint:
var val : uint = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 32)
| `Tyuint32:
var val : uint32 = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 32)
| `Tyuint64:
var val : uint64 = vanext(ap)
intfmt(sb, intparams(params), false, (val : uint64), 64)
| `Tyflt32:
var val : flt32 = vanext(ap)
flt32bfmt(sb, val, MNormal, 0)
| `Tyflt64:
var val : flt64 = vanext(ap)
flt64bfmt(sb, val, MNormal, 0)
| `Tyvalist:
sbputs(sb, "...")
/* compound types */
| `Typtr desc:
var val : void# = vanext(ap)
sbputs(sb, "0x")
intfmt(sb,
[.base=16, .padto=2*sizeof(void#), .padfill='0'],
false, (val : uint64), 64)
| `Tyslice desc:
match typedesc(desc)
| `Tybyte:
var val : byte[:] = vanext(ap)
strfmt(sb, val, params)
| _:
subap = vaenter(ap)
fmtslice(sb, subap, params)
vabytes(ap)
;;
| `Tyfunc tc:
var val : intptr[2] = vanext(ap)
sbputs(sb, "func{")
intfmt(sb,
[.base=16, .padto=2*sizeof(void#), .padfill='0'],
false, (val[0] : uint64), 0)
sbputs(sb, ", ")
intfmt(sb,
[.base=16, .padto=2*sizeof(void#), .padfill='0'],
false, (val[1] : uint64), 0)
sbputs(sb, "}")
| `Tyarray (sz, desc):
subap = vaenter(ap)
sbputs(sb, "[")
while subap.tc.nelt != 0
fmtval(sb, vatype(&subap), &subap, [][:])
if subap.tc.nelt > 0
sbfmt(sb, ", ")
;;
;;
sbputs(sb, "]")
vabytes(ap)
/* aggregate types */
| `Tytuple tc:
subap = vaenter(ap)
sbfmt(sb, "(")
for var i = 0; i < subap.tc.nelt; i++
fmtval(sb, vatype(&subap), &subap, [][:])
if subap.tc.nelt == 1
sbfmt(sb, ",")
elif i != subap.tc.nelt -1
sbfmt(sb, ", ")
;;
;;
sbfmt(sb, ")")
vabytes(ap)
| `Tystruct nc:
subap = vaenter(ap)
sbfmt(sb, "[")
for var i = 0; i < subap.tc.nelt; i++
(subname, subenc) = ncpeek(&subap.tc)
sbfmt(sb, ".{}=", subname)
fmtval(sb, vatype(&subap), &subap, [][:])
if subap.tc.nelt == 1
sbfmt(sb, ",")
elif i != subap.tc.nelt -1
sbfmt(sb, ", ")
;;
;;
sbfmt(sb, "]")
vabytes(ap)
| `Tyunion nc:
var tag : int32
inf = typeinfo(tcpeek(&ap.tc))
p = (ap.args : size)
p = (p + inf.align - 1) & ~(inf.align - 1)
tag = (p : int32#)#
subap = vaenterunion(ap, tag)
for var i = 0; i < tag; i++
ncnext(&nc)
;;
(subname, subenc) = ncnext(&nc)
sbfmt(sb, "`{}", subname)
match typedesc(subenc)
| `Tynone:
| _:
sbputc(sb, ' ')
fmtval(sb, subenc, &subap, [][:])
;;
vabytes(ap)
| `Tyname (name, desc):
subap = vaenter(ap)
fmtval(sb, desc, &subap, params)
vabytes(ap)
;;
}
const fmtslice = {sb, subap, params
var join, joined
join = ", "
joined = false
for p : params
match p
| ("j", j):
joined = true
join = j
| (opt, arg):
std.write(2, "fmt: \0")
std.write(2, opt)
std.write(2, "\0arg: ")
std.write(2, arg)
std.die("unreacahable")
;;
;;
if !joined
sbputs(sb, "[")
;;
while subap.tc.nelt != 0
fmtval(sb, vatype(&subap), &subap, [][:])
if subap.tc.nelt > 0
sbputs(sb, join)
;;
;;
if !joined
sbputs(sb, "]")
;;
}
type intparams = struct
base : size
padto : size
padfill : char
;;
const intparams = {params
var ip : intparams
ip = [
.base = 10,
.padfill = ' ',
.padto = 0
]
for p : params
match p
| ("b", bas): ip.base = getint(bas, "fmt: base must be integer")
| ("x", ""): ip.base = 16
| ("w", wid): ip.padto = getint(wid, "fmt: width must be integer")
| ("p", pad): ip.padfill = decode(pad)
| (opt, arg):
std.write(2, "fmt: ")
std.write(2, opt)
std.write(2, "arg: ")
std.write(2, arg)
std.die("\nunreachable\n")
;;
;;
iassert(ip.padto >= 0, "pad must be >= 0")
-> ip
}
const strfmt = {sb, str, params
var w, p, i, raw, esc
p = ' '
w = 0
raw = false
esc = false
for pp : params
match pp
| ("w", wid): w = getint(wid, "fmt: width must be integer")
| ("p", pad): p = decode(pad)
| ("r", ""): raw = true
| ("e", ""): esc = true
| (opt, arg):
std.write(2, "fmt: ")
std.write(2, opt)
std.write(2, "arg: ")
std.write(2, arg)
std.die("unreachable\n")
;;
;;
iassert(p >= 0, "pad must be >= 0")
if raw
for b : str
if esc
sbputs(sb, "\\x")
;;
intfmt(sb, [.padto=2, .padfill='0', .base=16], false, (b : uint64), 8)
;;
elif esc
for b : str
if isprint(b)
sbputb(sb, b)
else
match (b : char)
| '\n': sbputs(sb, "\\n")
| '\r': sbputs(sb, "\\r")
| '\t': sbputs(sb, "\\t")
| '\b': sbputs(sb, "\\b")
| '\"': sbputs(sb, "\\\"")
| '\'': sbputs(sb, "\\\'")
| '\\': sbputs(sb, "\\\\")
| '\0': sbputs(sb, "\\0")
| _:
sbputs(sb, "\\x")
intfmt(sb, [.padto=2, .padfill='0', .base=16], false, (b : uint64), 8)
;;
;;
;;
else
for i = 0; i < w - strcellwidth(str); i++
sbputc(sb, p)
;;
sbputs(sb, str)
;;
}
const isprint = {b
-> b >= (' ' : byte) && b < ('~' : byte)
}
const digitchars = "0123456789abcdef"
const intfmt = {sb, opts, signed, bits : uint64, nbits
var isneg
var sval, val
var b : byte[64]
var i, j, npad
var base
base = (opts.base : uint64)
if signed && bits >= 1 << (nbits - 1)
sval = -(bits : int64)
val = (sval : uint64)
isneg = true
/* if its negative after inverting, we have int64 min */
if sval < 0
std.sbputs(sb, "-9223372036854775808")
-> void
;;
else
val = (bits : uint64)
val &= ~0 >> nbits
isneg = false
;;
i = 0
if val == 0
b[0] = ('0' : byte)
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
sbputb(sb, ('-' : byte))
;;
for j = 0; j < npad; j++
sbputc(sb, opts.padfill)
;;
if opts.padfill != '0' && isneg
sbputb(sb, ('-' : byte))
;;
for j = i; j != 0; j--
sbputb(sb, b[j - 1])
;;
}
/* would use std.get(), but that's a dependency loop */
const getint = {s, msg
match std.intparse(s)
| `Some w: -> w;
| `None: die(msg)
;;
}