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507.txt
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507.txt
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[SEE[ [[ISO/IEC 2022]] ]]
* ISO/IEC 2022 Decoder
[1] A [DFN[state]] is:
[FIG(list members)[
: [DFN[[F[fixed set]]]] : [[Character set][character set]].
: [DFN[[F[escape set]]]] : [[Character set][character set]].
: [DFN[[F[macro set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[94 final set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[96 final set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[94[SUP[[VAR[n]]]] final set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[96[SUP[[VAR[n]]]] final set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[94[SUP[[VAR[n]]]] final RL set]]]] : [[Ordered map][ordered map]].
Initially, an [[empty][is empty]] [[ordered map]].
: [DFN[[F[C0 designated]]]] : [[C0 set]]. Initially, the [[initial C0 set]].
: [DFN[[F[C1 designated]]]] : [[C1 set]]. Initially, the [[empty C1 set]].
: [DFN[[F[C1 override designated]]]] : [[C1 set]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[G0 designated]]]] : [[G set]], [I[unknown-94]], or [I[unknown-96]].
Initially, [I[unknown-96]].
: [DFN[[F[G1 designated]]]] : [[G set]], [I[unknown-94]], or [I[unknown-96]].
Initially, [I[unknown-96]].
: [DFN[[F[G2 designated]]]] : [[G set]], [I[unknown-94]], or [I[unknown-96]].
Initially, [I[unknown-96]].
: [DFN[[F[G3 designated]]]] : [[G set]], [I[unknown-94]], or [I[unknown-96]].
Initially, [I[unknown-96]].
: [DFN[[F[G0 RL designated]]]] : [[94[SUP[2]] set]] or [I[unknown-94]].
Initially, [I[unknown-94]].
: [DFN[[F[G1 RL designated]]]] : [[94[SUP[2]] set]] or [I[unknown-94]].
Initially, [I[unknown-94]].
: [DFN[[F[G2 RL designated]]]] : [[94[SUP[2]] set]] or [I[unknown-94]].
Initially, [I[unknown-94]].
: [DFN[[F[G3 RL designated]]]] : [[94[SUP[2]] set]] or [I[unknown-94]].
Initially, [I[unknown-94]].
: [DFN[[F[Gj designated]]]] : [[94 set]]. Initially, [I[unknown-94]].
: [DFN[[F[S1 designated]]]] : [[94[SUP[2]] set]].
: [DFN[[F[S2 designated]]]] : [[94[SUP[2]] set]].
: [DFN[[F[left designated]]]] : [[G set]] or [[128 set]].
: [DFN[[F[right designated]]]] : [[128 set]].
: [DFN[[F[opaque designated]]]] : [[256 set]].
: [DFN[[F[CR invoked]]]] : [[C element]].
Initially, [I[C1]].
: [DFN[[F[GL invoked]]]] : [[G element]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[GR invoked]]]] : [[G element]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[GL mode]]]] : [[GL mode]].
Initially, [I[iso2022]].
: [DFN[[F[right mode]]]] : A [[right mode]].
Initially, [I[iso2022]].
: [DFN[[F[shift plane 2 mode]]]] : [I[normal]] or [I[jisx0213]].
Initially, [I[normal]].
: [DFN[[F[bits]]]] : [I[8-bit]] or [I[7-bit]].
Initially, [I[8-bit]].
: [DFN[[F[VT response flag]]]] : [[Boolean][boolean]].
Initially, [[false]].
: [DFN[[F[ISO 4873 Latin-1 flag]]]] : [[Boolean][boolean]].
Initially, [[false]].
: [DFN[[F[UTF-8 GL flag]]]] : [[Boolean][boolean]].
Initially, [[false]].
: [DFN[[F[data syntax 2 default mode]]]] : [I[serial]] or [I[parallel]].
Initially, [I[serial]].
: [DFN[[F[videotex basic kernel flag]]]] : [[Boolean][boolean]].
Initially, [[false]].
: [DFN[[F[current byte sequence]]]] : [[Byte sequence][byte sequence]].
: [DFN[[F[current element]]]] : [[C element]] or [[G element]].
: [DFN[[F[current size]]]] : [N[94]] or [N[96]].
: [DFN[[F[current bytes]]]] : [N[1]], [N[2]], or [N[3]].
: [DFN[[F[current I byte]]]] : [[Byte][byte]].
: [DFN[[F[current J byte]]]] : [[Byte][byte]] or [CODE[null]].
: [DFN[[F[current revision byte]]]] : [[Byte][byte]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[current segment length]]]] : Non-negative integer or [CODE[null]].
: [DFN[[F[current segment data]]]] : [[Byte sequence][byte sequence]].
: [DFN[[F[current capturing byte]]]] : [CODE[Byte][byte]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[current frame length]]]] : Non-negative integer or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[decoder state]]]] : One of [[decoder states][decoder state]].
Initially, [[default state]].
: [DFN[[F[previous state]]]] : [[State][state]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[previous GL mode]]]] : [[GL mode]] or [CODE[null]].
Initially, [CODE[null]].
: [DFN[[F[previous left designated]]]] : [[G set]] or [[128 set]].
]FIG]
[223] A [DFN[C element]] is [I[C0]] or [I[C1]].
[100] A [DFN[G element]] is [I[G0]], [I[G1]], [I[G2]], [I[G3]], or [I[Gj]].
[1704] A [DFN[GL mode]] is one of:
[I[iso2022]], [I[captain]], [I[telesoftware]], and [I[single]].
[1291] A [DFN[right mode]] is one of:
[I[iso2022]],
[I[iso2022jp]],
[I[utf-1]], [I[utf-8]],
[I[single]],
[I[sjis]], [I[sjis-2000]],
[I[big5]],
[I[uhc]], [I[johab]],
[I[gbk]], [I[gb18030]],
and
[I[x-moe-internal]].
[117] A [DFN[maximum sequence length]] is an implementation-specific integer,
e.g. [N[15]].
[94] A [DFN[maximum chunk length]] is an implementation-specific integer,
e.g. 2[SUP[30]] - 1.
[315]
To [DFN[get invoked set]] with
[[state]] [VAR[state]] and [[G element]] or [CODE[null]] [VAR[element]],
run these steps:
[FIG(steps)[
= [302] If [VAR[element]] is [CODE[null]]:
== [303] Return [I[unknown-96]].
= [304] Otherwise, if [VAR[element]] is [I[G0]]:
== [305] Return [VAR[state]]'s [F[G0 designated]].
= [306] Otherwise, if [VAR[element]] is [I[G1]]:
== [307] Return [VAR[state]]'s [F[G1 designated]].
= [308] Otherwise, if [VAR[element]] is [I[G2]]:
== [309] Return [VAR[state]]'s [F[G2 designated]].
= [310] Otherwise, if [VAR[element]] is [I[G3]]:
== [311] Return [VAR[state]]'s [F[G3 designated]].
]FIG]
[796]
To [DFN[get RL invoked set]] with
[[state]] [VAR[state]] and [[G element]] or [CODE[null]] [VAR[element]],
run these steps:
[FIG(steps)[
= [797] If [VAR[element]] is [CODE[null]]:
== [798] Return [I[unknown-94]].
= [799] Otherwise, if [VAR[element]] is [I[G0]]:
== [800] Return [VAR[state]]'s [F[G0 RL designated]].
= [801] Otherwise, if [VAR[element]] is [I[G1]]:
== [802] Return [VAR[state]]'s [F[G1 RL designated]].
= [803] Otherwise, if [VAR[element]] is [I[G2]]:
== [804] Return [VAR[state]]'s [F[G2 RL designated]].
= [805] Otherwise, if [VAR[element]] is [I[G3]]:
== [806] Return [VAR[state]]'s [F[G3 RL designated]].
]FIG]
** Initial state
[20] A [[state initialization steps]] is a set of zero or more steps
that modifies [VAR[state]]. It can modify [VAR[state]] in these ways:
- [21] It [MAY[MAY]] modify values of [VAR[state]]'s
[F[C0 designated]],
[F[C1 designated]],
[F[G0 designated]],
[F[G1 designated]],
[F[G2 designated]],
[F[G3 designated]],
[F[right designated]],
[F[G0 RL designated]],
[F[G1 RL designated]],
[F[G2 RL designated]],
[F[G3 RL designated]],
[F[CR invoked]],
[F[GL invoked]],
[F[GR invoked]],
[F[GL mode]],
[F[right mode]],
[F[bits]],
[F[VT response flag]],
[F[ISO 4873 Latin-1 flag]],
[F[UTF-8 GL flag]],
[F[data syntax 2 default mode]],
and/or
[F[videotex basic kernel flag]].
- [319] It [MAY[MAY]] invoke the steps to [[modify character sets]]
of [VAR[state]] for some [VAR[features]].
- [807] If [VAR[state]]'s [F[G0 RL designated]] is set to a [[94[SUP[2]] set]],
[VAR[state]]'s [F[G0 designated]] [MUST[MUST]] be set to a [[94[SUP[2]] set]],
- [808] If [VAR[state]]'s [F[G1 RL designated]] is set to a [[94[SUP[2]] set]],
[VAR[state]]'s [F[G1 designated]] [MUST[MUST]] be set to a [[94[SUP[2]] set]],
- [809] If [VAR[state]]'s [F[G2 RL designated]] is set to a [[94[SUP[2]] set]],
[VAR[state]]'s [F[G2 designated]] [MUST[MUST]] be set to a [[94[SUP[2]] set]],
- [810] If [VAR[state]]'s [F[G3 RL designated]] is set to a [[94[SUP[2]] set]],
[VAR[state]]'s [F[G3 designated]] [MUST[MUST]] be set to a [[94[SUP[2]] set]],
** Input stream
@@
[99]
input stream:
[[bit combination]],
[[end-of-frame]],
and
[I[end-of-file]];
[VAR[get the next byte]] : [[byte getter]];
[VAR[initialization steps]] a [[state initialization steps]],
run these steps:
[FIG(steps)[
= [8] Let [VAR[state]] be a new [[state]].
= [327] [[Modify character sets][modify character sets]]
of [VAR[state]] for
« "fixed", "fallback", "iso2022" ».
= [9] Run [VAR[initialization steps]] with [VAR[state]].
= [6] Let [VAR[output stream]] be a [[list]].
= [1468] Let [VAR[next]] be [CODE[null]].
= [1456] [[While]] [VAR[next]] is not [I[end-of-file]]:
== [1457] If [VAR[state]]'s [F[current frame length]] is [N[0]]:
=== [1455] Set [VAR[state]]'s [F[current frame length]] to [CODE[null]].
=== [1458] Set [VAR[next]] to an [[end-of-frame]] ([[false]]).
== [1459] Otherwise:
=== [1460] Set [VAR[next]] to the result of
[[getting the next byte][get the next byte]].
=== [1461] If [VAR[next]] is [CODE[null]]:
==== [1462] If [VAR[state]]'s [F[current frame length]] is [CODE[null]]:
===== [1464] Set [VAR[next]] to an [I[end-of-file]].
==== [1465] Otherwise:
===== [1463] Set [VAR[next]] to an [[end-of-frame]] ([[true]]).
==== [1466] Set [VAR[get the next byte]] to a function that returns [CODE[null]].
=== [1469] Otherwise:
==== [1471] If [VAR[state]]'s [F[current frame length]] is ''not'' [CODE[null]]:
===== [1470] Set [VAR[state]]'s [F[current frame length]] to
[VAR[state]]'s [F[current frame length]] - 1.
==== [1761] If [VAR[state]]'s [F[current capturing byte]] is ''not'' [CODE[null]]:
===== [1762] Set
[VAR[state]]'s [F[macro set]] [ [VAR[state]]'s [F[current capturing byte]] ]
to
[VAR[state]]'s [F[macro set]] [ [VAR[state]]'s [F[current capturing byte]] ]
followed by [VAR[next]].
== [1467]
@@
run [VAR[state]]'s [F[decoder state]]'s switch
= [7]
Return [VAR[output stream]].
]FIG]
[1574]
A [DFN[byte getter]] is a steps that returns a [CODE[byte]] or [CODE[null]].
It represents an input byte stream.
Whenever invoked, it is expected to return a [[byte]] from the stream it represents,
in order. It is expected to return a [CODE[null]] after the end of the stream
is reached.
[1472]
An [DFN[end-of-frame]] is a [[tuple]] of
[DFN[[F[incomplete]]]] ([[boolean]]).
** Output stream
@@
[97] [VAR[output stream]] might contain
[[characters][character]],
and
@@ [[EOF]].
[4]
To [DFN[emit a character]] with [[character]] [VAR[char]], run these steps:
[FIG(steps)[
=
[5]
[[Append][append]]
[VAR[char]]
to
[VAR[output stream]].
]FIG]
[115]
To [DFN[emit a sequence]] with [[character string]] [VAR[seq]], run these steps:
[FIG(steps)[
=
[116]
[[Extend][extend]]
[VAR[output stream]]
with
[VAR[seq]].
]FIG]
[355]
When [DFN[error]], run these steps:
[FIG(steps)[
= [356] An error [MAY[may]] be reported to a [[developer console]].
= [153] [[Emit a character][emit a character]] [CODE[U+FFFD]].
]FIG]
;; [386] There is an illegal sequence.
[58]
When [DFN[deprecated]], run these steps:
[FIG(steps)[
= [59] A warning [MAY[may]] be reported to a [[developer console]].
]FIG]
;; [385] There is a sequence that is discouraged by a relevant specification,
or that is an extension to the ISO/IEC 2022 standard.
@@[DFN[reconsume]]
@@
** Decoder states
[27]
The decoder has several [DFN[decoder states]] for processing input
[[bit combinations][bit combination]].
[719]
To [DFN[process a control [[character]]]] [VAR[char]],
[[switch]] by [VAR[char]]:
[FIG(switch)[
:[CODE(charname)@en[ESC]]:
[FIG(steps)[
= [30] Set [VAR[state]]'s [F[decoder state]] to [I[escape state]].
]FIG]
:[CODE(charname)@en[LS0]]:
[FIG(steps)[
= [209] Set [VAR[state]]'s [F[GL invoked]] to [I[G0]].
]FIG]
:[CODE(charname)@en[LS1]]:
[FIG(steps)[
= [1280] If [VAR[state]]'s [F[GL invoked]] is [I[Gj]]:
== [1281] Set [VAR[state]]'s [F[GL invoked]] to [I[G0]].
= [1282] Otherwise:
== [212] Set [VAR[state]]'s [F[GL invoked]] to [I[G1]].
]FIG]
:[CODE(charname)@en[LS2]]:
[FIG(steps)[
= [750] Set [VAR[state]]'s [F[GL invoked]] to [I[G2]].
]FIG]
:[CODE(charname)@en[LS3]]:
[FIG(steps)[
= [752] Set [VAR[state]]'s [F[GL invoked]] to [I[G3]].
]FIG]
:[CODE(charname)@en[LS1R]]:
[FIG(steps)[
= [61] If [VAR[state]]'s [F[bits]] is [I[7-bit]]:
== [101] Set [VAR[state]]'s [F[GL invoked]] to [I[G1]].
= [102] Otherwise:
== [127] Set [VAR[state]]'s [F[GR invoked]] to [I[G1]].
]FIG]
:[CODE(charname)@en[LS2R]]:
[FIG(steps)[
= [129] If [VAR[state]]'s [F[bits]] is [I[7-bit]]:
== [130] Set [VAR[state]]'s [F[GL invoked]] to [I[G2]].
= [131] Otherwise:
== [132] Set [VAR[state]]'s [F[GR invoked]] to [I[G2]].
]FIG]
:[CODE(charname)@en[LS3R]]:
[FIG(steps)[
= [754] If [VAR[state]]'s [F[bits]] is [I[7-bit]]:
== [133] Set [VAR[state]]'s [F[GL invoked]] to [I[G3]].
= [134] Otherwise:
== [135] Set [VAR[state]]'s [F[GR invoked]] to [I[G3]].
]FIG]
:[CODE(charname)@en[SS2]]:
[FIG(steps)[
= [226] Set [VAR[state]]'s [F[current element]] to [I[G2]].
= [214] Set [VAR[state]]'s [F[decoder state]] to [I[SS state]].
]FIG]
:[CODE(charname)@en[SS3]]:
[FIG(steps)[
= [227] Set [VAR[state]]'s [F[current element]] to [I[G3]].
= [216] Set [VAR[state]]'s [F[decoder state]] to [I[SS state]].
]FIG]
: [CODE(charname)@en[EXT1]] :
[FIG(steps)[
= [1718] Set [VAR[state]]'s [F[decoder state]] to [I[EXT1 state]].
]FIG]
:([I[marc]], [I[esc]], [VAR[bc]]) where [VAR[bc]] is a [[bit combination]]:
[FIG(steps)[
= [103] [[Deprecated][deprecated]].
= [31] Set [VAR[state]]'s [F[G0 designated]] to
[VAR[state]]'s [F[94 final set]] [ [N[1/11]] followed by [VAR[bc]] ].
= [968] Set [VAR[state]]'s [F[G0 RL designated]] to [I[unassigned-94]].
]FIG]
:([I[vt]], [I[C1]], [VAR[bc]]) where [VAR[bc]] is [N[8/6]] or [N[8/7]]:
[FIG(steps)[
= [789] Set [VAR[state]]'s [F[G0 designated]] to
[VAR[state]]'s [F[94 final set]] [ [VAR[bc]] ].
= [969] Set [VAR[state]]'s [F[G0 RL designated]] to [I[unassigned-94]].
]FIG]
:([I[vt]], [I[esc]], [N[3/12]]):
[FIG(steps)[
= [785] [[Modify character sets][modify character sets]]
of [VAR[state]] for
« "iso2022", "vt" ».
= [786] [[Emit][emit a character]] [VAR[char]].
]FIG]
:([I[tektronix]], [I[esc]], [N[0/3]]):
[FIG(steps)[
= [718] Set [VAR[state]]'s [F[C1 designated]] to the result of
[[getting a C set][get a C set]] with [I[C1]], [I[vt]], [I[C1]].
= [677] [[Modify character sets][modify character sets]]
of [VAR[state]] for
« "noescc0", "vt" ».
= [738] [[Emit][emit a character]] [VAR[char]].
]FIG]
:([I[vt]], [I[esc]], [N[7/11]]):
[FIG(steps)[
= [679] Set [VAR[state]]'s [F[decoder state]] to [I[file state]].
]FIG]
:([I[C0]], [VAR[bytes]], [N[1/15]]) where [VAR[bytes]] is in [ [N[4/9]], [N[4/11]] ]:
[FIG(steps)[
= [182] Set [VAR[state]]'s [F[current I byte]] to [VAR[bytes]].
= [199] Set [VAR[state]]'s [F[decoder state]] to [I[US state]].
]FIG]
:([I[videotex]], [I[sound-control]], [VAR[bytes]]) where [VAR[bytes]] is one of [N[8/0]], [N[8/1]], [N[8/2]], [N[8/8]], [N[8/9]], [N[8/12]], [N[9/0]], and [N[9/12]]:
[FIG(steps)[
= [1497] [[Emit][emit a character]] [VAR[char]].
= [1483] Set [VAR[state]]'s [F[decoder state]] to [I[sound control parameter state]].
]FIG]
:([I[videotex]], [I[sound-control]], [VAR[bytes]]) where [VAR[bytes]] is [N[8/10]] or [N[8/11]]:
[FIG(steps)[
= [1498] [[Emit][emit a character]] [VAR[char]].
= [1484] Set [VAR[state]]'s [F[decoder state]] to [I[sound control state]].
]FIG]
: ([I[vt52]], [I[esc]], [N[6/2]]), ([I[vt52]], [I[esc]], [N[6/3]]), ([I[C0]], [N[4/9]], [N[1/4]]), ([I[C1]], [N[4/4]], [VAR[bc]]) where [VAR[bc]] is [N[8/11]], [N[9/0]], [N[9/1]], or [N[9/2]], ([I[C0]], [N[4/10]], [N[1/2]]), ([I[dtvcc]], [I[C0]], [VAR[bc]]) where [VAR[bc]] is in [ [N[1/0]], [N[1/7]] ], ([I[dtvcc]], [I[C1]], [VAR[bc]]) where [VAR[bc]] is in [ [N[8/8]], [N[8/13]] ], ([I[dtvcc]], [I[C2]], [VAR[bc]]) where [VAR[bc]] is in [ [N[0/8]], [N[0/15]] ] :
[FIG(steps)[
= [210] [[Emit][emit a character]] [VAR[char]].
= [211] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1742] Set [VAR[state]]'s [F[current segment length]] to [N[1]].
]FIG]
: ([I[vt52]], [I[C1]], [N[9/9]]), ([I[C0]], [I[C0]], [N[1/12]]), ([I[dtvcc]], [I[C0]], [VAR[bc]]) where [VAR[bc]] in [ [N[1/8]], [N[1/15]] ], ([I[dtvcc]], [I[C1]], [VAR[bc]]) where [VAR[bc]] is [N[9/0]] or [N[9/2]], ([I[dtvcc]], [I[C2]], [VAR[bc]]) where [VAR[bc]] is in [ [N[1/0]], [N[1/7]] ] :
[FIG(steps)[
= [1499] [[Emit][emit a character]] [VAR[char]].
= [722] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1743] Set [VAR[state]]'s [F[current segment length]] to [N[2]].
]FIG]
: ([I[dtvcc]], [I[C1]], [N[9/1]]), ([I[dtvcc]], [I[C2]], [VAR[bc]]) where [VAR[bc]] is in [ [N[1/8]], [N[1/15]] ] :
[FIG(steps)[
= [229] [[Emit][emit a character]] [VAR[char]].
= [681] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1744] Set [VAR[state]]'s [F[current segment length]] to [N[3]].
]FIG]
: ([I[dtvcc]], [I[C1]], [N[9/7]]), ([I[dtvcc]], [I[C3]], [VAR[bc]]) where [VAR[bc]] is in [ [N[8/0]], [N[8/7]] ] :
[FIG(steps)[
= [724] [[Emit][emit a character]] [VAR[char]].
= [732] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1745] Set [VAR[state]]'s [F[current segment length]] to [N[4]].
]FIG]
: ([I[dtvcc]], [I[C3]], [VAR[bc]]) where [VAR[bc]] is in [ [N[8/8]], [N[8/15]] ] :
[FIG(steps)[
= [735] [[Emit][emit a character]] [VAR[char]].
= [736] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1746] Set [VAR[state]]'s [F[current segment length]] to [N[5]].
]FIG]
: ([I[dtvcc]], [I[C1]], [VAR[bc]]) where [VAR[bc]] is in [ [N[9/8]], [N[9/15]] ] :
[FIG(steps)[
= [737] [[Emit][emit a character]] [VAR[char]].
= [771] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1747] Set [VAR[state]]'s [F[current segment length]] to [N[6]].
]FIG]
: ([I[dtvcc]], [I[C3]], [VAR[bc]]) where [VAR[bc]] is in [ [N[9/0]], [N[9/15]] ] :
[FIG(steps)[
= [772] [[Emit][emit a character]]
[[character]] ([I[dtvcc]], [[C3]], [VAR[bc]] & [N[0b11100000]]).
= [771] Set [VAR[state]]'s [F[decoder state]] to [I[control parameter state]].
= [1747] Set [VAR[state]]'s [F[current segment length]] to [VAR[bc]] & [N[0b00011111]].
]FIG]
: ([I[dtvcc]], [I[C2]], [VAR[bc]]) where [VAR[bc]] in [ [N[0/8]], [N[0/15]] :
:([I[C1]], [N[4/0]], [VAR[bc]]) where [VAR[bc]] is in [ [N[8/0]], [N[8/7]] ]:
[FIG(steps)[
= [1538] [[Emit][emit a character]] [VAR[char]].
= [1539] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
]FIG]
:([I[C1]], [N[4/0]], [VAR[bc]]) where [VAR[bc]] is in [ [N[9/0]], [N[9/7]] ]:
[FIG(steps)[
= [1536] [[Emit][emit a character]] [VAR[char]].
= [1537] Set [VAR[state]]'s [F[GL mode]] to [I[single]].
= [1112] Set [VAR[state]]'s [F[left designated]] to the result of
[[getting a G set][get a G set]] with
[I[96]], [I[1]], [I[videotex]], [I[l]].
]FIG]
: [CODE(charname)@en[P-MACRO]] :
[FIG(steps)[
= [1166] Set [VAR[state]]'s [F[decoder state]] to [I[macro state]].
]FIG]
:[CODE(charname)@en[SOS]]:
[FIG(steps)[
= [1705] Set [VAR[state]]'s [F[previous GL mode]] to [VAR[state]]'s [F[GL mode]].
= [1713] Set [VAR[state]]'s [F[previous left designated]]
to [VAR[state]]'s [F[left designated]].
= [1706] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
= [1707] [[Emit][emit a character]] [VAR[char]].
]FIG]
:[CODE(charname)@en[ST]]:
[FIG(steps)[
= [1709] If [VAR[state]]'s [F[previous GL mode]] is ''not'' [CODE[null]]:
== [1708] Set [VAR[state]]'s [F[GL mode]] to [VAR[state]]'s [F[previous GL mode]].
== [1714] Set [VAR[state]]'s [F[left designated]] to
[VAR[state]]'s [F[previous left designated]].
== [1710] Set [VAR[state]]'s [F[previous GL mode]] to [CODE[null]].
= [1711] [[Emit][emit a character]] [VAR[char]].
]FIG]
:[CODE(charname)@en[PCD]]:
[FIG(steps)[
= [729] [[Emit][emit a character]] [VAR[char]].
= [65] Set [VAR[state]]'s [F[decoder state]] to [I[PCD state]].
]FIG]
:[CODE(charname)@en[CMD]]:
[FIG(steps)[
= [730] [[Emit][emit a character]] [VAR[char]].
= [1272] Set [VAR[state]]'s [F[opaque designated]] to the result of
[[getting a 256 set][get a 256 set]]
[I[unknown-byte]], [CODE[null]].
= [48] Set [VAR[state]]'s [F[decoder state]] to [I[opaque state]].
]FIG]
:([I[unknown-control]], [CODE[null]], [VAR[bytes]]) where [VAR[bytes]] is a [[byte sequence]]:
[FIG(steps)[
= [660] [[Emit][emit a character]] [VAR[char]].
= [1273] Set [VAR[state]]'s [F[opaque designated]] to the result of
[[getting a 256 set][get a 256 set]]
[I[unknown-byte]], [CODE[null]].
= [659] Set [VAR[state]]'s [F[decoder state]] to [I[opaque state]].
]FIG]
:([I[deprecated]], [VAR[c]]) where [VAR[c]] is a [[character]]:
[FIG(steps)[
= [756] [[Deprecated][deprecated]].
= [755] [[Process][process a control character]] [VAR[c]].
]FIG]
:Otherwise:
[FIG(steps)[
= [13] [[Emit][emit a character]] [VAR[char]].
]FIG]
]FIG]
[1451]
To [DFN[initialize by DI]] [VAR[state]], run these steps:
[FIG(steps)[
= [1452] If [VAR[state]]'s [F[current I byte]] is [N[2/0]]:
== [932] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
== [1437] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [1422] [[Run a macro][run a macro]]
"ESC 2/1 4/9 ESC 2/2 4/4 ESC 2/6 4/0 ESC 2/4 4/2 ESC 2/9 4/10 ESC 2/14 3/8 ESC 2/11 2/0 4/1 LS0 LS2R".
= [1424] Otherwise, if [VAR[state]]'s [F[current I byte]] is [N[4/1]]:
== [1475] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
== [1476] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [1477] [[Run a macro][run a macro]]
"ESC 2/1 4/9 LS0".
== [1478] Set [VAR[state]]'s [F[C1 designated]] to the result of
[[getting a C set][get a C set]] with
[I[C1]], [I[videotex]], [I[sound-control]].
== [1479] Set [VAR[state]]'s [F[G0 designated]] to the result of
[[getting a G set][get a G set]] with
[I[96]], [I[1]], [I[videotex]], [I[sound-tone]].
= [1425] Otherwise, if [VAR[state]]'s [F[current I byte]] is [N[4/0]]:
== [1482] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
== [1481] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [1480] [[Run a macro][run a macro]]
"ESC 2/1 4/9 ESC 2/2 4/4 ESC 2/8 4/9 ESC 2/6 4/0 ESC 2/4 2/9 4/2 ESC 2/10 4/10 LS0 LS2R".
= [1426] Otherwise:
== [1445] Set [VAR[state]]'s [F[opaque designated]] to the result of
[[getting a 256 set][get a 256 set]]
[I[captain]], [VAR[state]]'s [F[current I byte]].
== [1454] Set [VAR[state]]'s [F[decoder state]] to [I[opaque state]].
]FIG]
[1527]
To [DFN[initialize data syntax 2]] with
[VAR[state]]
and
[I[serial]], [I[parallel]], or [CODE[null]] [VAR[mode]],
run these steps:
[FIG(steps)[
= [1651] [[Modify character sets][modify character sets]]
of [VAR[state]] for
« "iso2022", "videotex" ».
= [1543] Set [VAR[state]]'s [F[GL mode]] to [I[iso2022]].
= [1528] [[Run a macro][run a macro]]
"ESC 2/1 4/10 ESC 2/8 4/0 ESC 2/9 6/3 ESC 2/10 6/2 ESC 2/11 6/4 LS0 LS2R".
= [1529] If [VAR[mode]] is [I[serial]]:
== [1530] [[Run a macro][run a macro]] "ESC 2/2 4/0".
= [1531] Otherwise, if [VAR[mode]] is [I[parallel]]:
== [1532] [[Run a macro][run a macro]] "ESC 2/2 4/1".
= [1533] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
]FIG]
@@
[1429] To [DFN[run a macro]] [VAR[bytes]], ...
-*-*-
[2] There are the following [[decoder states][decoder state]]:
*** Default state
[3] The [DFN[default state]] switches by the [[bit combination]] [VAR[bc]]:
[FIG(switch)[
: [ [N[0/0]], [N[1/15]] ] :
[FIG(steps)[
= [11] Let [VAR[set]] be [VAR[state]]'s [F[C0 designated]].
= [717] [[Process a control character][process a control character]]
[VAR[set]] [ [VAR[bc]] ].
]FIG]
:[ [N[2/0]], [N[7/15]] ]:
[FIG(steps)[
= [1420] If [VAR[state]]'s [F[GL mode]] is [I[captain]]:
== [1427] Set [VAR[state]]'s [F[current I byte]] to [VAR[bc]].
== [1428] Set [VAR[state]]'s [F[decoder state]] to [I[CAPTAIN DI state]].
= [1613] Otherwise, if [VAR[state]]'s [F[GL mode]] is [I[telesoftware]]:
== [1577] [[Emit][emit a character]]
[[character]] ([I[videotex]], [I[telesoftware-ci]], [VAR[bc]]).
== [1612] If [VAR[state]]'s [F[videotex basic kernel flag]] is [[false]]:
=== [1578] Set [VAR[state]]'s [F[decoder state]] to [I[TELESOFTWARE CI state]].
= [1712] Otherwise:
== [1109] If [VAR[state]]'s [F[GL mode]] is [I[single]]:
=== [1079] Let [VAR[set]] be [VAR[state]]'s [F[left designated]].
== [1080] Otherwise, if [VAR[state]]'s [F[GL mode]] is [I[iso2022]]:
=== [314] Let [VAR[set]] be the result of
[[getting invoked set][get invoked set]] with
[VAR[state]] and [VAR[state]]'s [F[GL invoked]].
== [1288] If [VAR[state]]'s [F[right mode]] is [I[iso2022jp]] and
[VAR[bc]] is [N[7/15]]:
=== [1289] Set [VAR[state]]'s [F[decoder state]] to [I[foreign right state]].
=== [1290] [[Reconsume][reconsume]] [VAR[bc]].
== [507] Otherwise, if [[is 96 size]] [VAR[set]] is [[false]] and
[VAR[bc]] is [N[2/0]] or [N[7/15]]:
=== [318] [[Emit a character][emit a character]]
[VAR[state]]'s [F[fixed set]] [ [VAR[bc]] ].
== [422] Otherwise, if [VAR[set]] is [I[unknown-94]] or [I[unknown-96]]:
=== [440] Set [VAR[state]]'s [F[decoder state]] to [I[left unassigned state]].
=== [441] [[Reconsume][reconsume]] [VAR[bc]].
== [424] Otherwise:
=== [448] Set [VAR[state]]'s [F[current bytes]] to [VAR[set]]'s [[byte length]].
=== [449] If [VAR[state]]'s [F[current bytes]] is [N[1]]:
==== [185] [[Emit a character][emit a character]] [VAR[set]] [ [VAR[bc]] ].
=== [450] Otherwise:
==== [451] Set [VAR[state]]'s [F[current I byte]] to [VAR[bc]].
==== [487] Set [VAR[state]]'s [F[current J byte]] to [CODE[null]].
==== [452] Set [VAR[state]]'s [F[decoder bytes]] to [I[left leading byte state]].
]FIG]
: [ [N[8/0]], [N[9/15]] ] :
[FIG(steps)[
= [1081] If [VAR[state]]'s [F[right mode]] is ''not'' [I[iso2022]]:
== [1082] Set [VAR[state]]'s [F[decoder state]] to [I[foreign right state]].
== [1083] [[Reconsume][reconsume]] [VAR[bc]].
= [834] Otherwise, if [VAR[state]]'s [F[CR invoked]] is [I[C1]]:
== [1559] If [VAR[state]]'s [F[C1 override designated]] is [CODE[null]]:
=== [26] Let [VAR[set]] be [VAR[state]]'s [F[C1 designated]].
== [1560] Otherwise:
=== [1561] Let [VAR[set]] be [VAR[state]]'s [F[C1 override designated]].
== [28] [[Process a control character][process a control character]]
[VAR[set]] [ [VAR[bc]] ].
= [835] Otherwise, if [VAR[state]]'s [F[CR invoked]] is [I[C0]]:
== [836] Let [VAR[set]] be [VAR[state]]'s [F[C0 designated]].
== [837] [[Process a control character][process a control character]]
[VAR[set]] [ [VAR[bc]] & [N[0b01111111]] ].
]FIG]
:[ [N[10/0]], [N[15/15]] ]:
[FIG(steps)[
= [334] Let [VAR[set]] be the result of
[[getting invoked set][get invoked set]] with
[VAR[state]] and [VAR[state]]'s [F[GR invoked]].
= [1084] If [VAR[state]]'s [F[right mode]] is ''not'' [I[iso2022]]:
== [1085] Set [VAR[state]]'s [F[decoder state]] to [I[foreign right state]].
== [1086] [[Reconsume][reconsume]] [VAR[bc]].
= [312] Otherwise, if [[is 96 size]] [VAR[set]] is [[false]] and
[VAR[bc]] is [N[10/0]] or [N[15/15]]:
== [317] [[Emit a character][emit a character]]
[VAR[state]]'s [F[fixed set]] [ [VAR[bc]] ].
= [313] Otherwise, if [VAR[set]] is [I[unknown-94]] or [I[unknown-96]]:
== [423] Set [VAR[state]]'s [F[decoder state]] to [I[right unassigned state]].
== [430] [[Reconsume][reconsume]] [VAR[bc]].
= [431] Otherwise:
== [432] Set [VAR[state]]'s [F[current bytes]] to [VAR[set]]'s [[byte length]].
== [471] If [VAR[state]]'s [F[current bytes]] is [N[1]]:
=== [473] [[Emit a character][emit a character]]
[VAR[set]] [ [VAR[bc]] & [N[0b01111111]] ].
== [474] Otherwise:
=== [475] Set [VAR[state]]'s [F[current I byte]] to [VAR[bc]] & [N[0b01111111]].
=== [490] Set [VAR[state]]'s [F[current J byte]] to [CODE[null]].
=== [476] Set [VAR[state]]'s [F[decoder bytes]] to [I[right leading byte state]].
]FIG]
: [[end-of-frame]] :
[FIG(steps)[
= [1473] If [VAR[bc]]'s [F[incomplete]] is [[true]]:
== [1474] [[Error][error]].
= [1423] Set [VAR[state]]'s [F[GL mode]] to [I[captain]].
= [1421] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
]FIG]
: [I[end-of-file]] :
@@
: Otherwise :
@@
]FIG]
*** SS state
[217] The [DFN[SS state]] switches by the [[bit combination]] [VAR[bc]]:
[FIG(switch)[
:[ [[2/0]], [[7/15]] ], [ [[10/0]], [[15/15]] ]:
[FIG(steps)[
= [344] If [VAR[state]]'s [F[current element]] is [I[G2]]:
== [343] Let [VAR[set]] be [VAR[state]]'s [F[G2 designated]].
= [345] If [VAR[state]]'s [F[current element]] is [I[G3]]:
== [346] Let [VAR[set]] be [VAR[state]]'s [F[G3 designated]].
= [528] If [[is 96 size]] [VAR[set]] is [[false]] and
[VAR[bc]] is [N[2/0]], [N[7/15]], [N[10/0]], or [N[15/15]]:
== [349] [[Error][error]].
== [354] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [364] [[Reconsume][reconsume]] [VAR[bc]].
= [444] Otherwise, if [VAR[set]] is [I[unknown-94]] or [I[unknown-96]]:
== [271] [[Error][error]].
== [438] Set [VAR[state]]'s [F[decoder state]] to [I[SS unassigned state]].
== [442] [[Reconsume][reconsume]] [VAR[bc]].
= [447] Otherwise:
== [272] Set [VAR[state]]'s [F[current bytes]] to [VAR[set]]'s [[byte length]].
== [316] If [VAR[state]]'s [F[current bytes]] is [N[1]]:
=== [326] [[Emit a character][emit a character]]
[VAR[set]] [ [VAR[bc]] & [N[0b01111111]] ].
=== [443] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [329] Otherwise:
=== [332] Set [VAR[state]]'s [F[current I byte]] to [VAR[bc]] & [N[0b01111111]].
=== [341] Set [VAR[state]]'s [F[current J byte]] to [CODE[null]].
=== [347] Set [VAR[state]]'s [F[decoder bytes]] to [I[SS leading byte state]].
]FIG]
: Otherwise :
[FIG(steps)[
= [357] [[Error][error]].
= [359] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
= [358] [[Reconsume][reconsume]] [VAR[bc]].
]FIG]
]FIG]
*** EXT1 state
[1719] The [DFN[EXT1 state]] switches by the [[bit combination]] [VAR[bc]]:
[FIG(switch)[
:[ [N[0/0]], [N[1/15]] ]:
[FIG(steps)[
= [1720] Let [VAR[set]] be the result of
[[getting a C set][get a C set]]
[I[C0]], [I[dtvcc]], [I[C2]].
= [1722] [[Process a control character][process a control character]]
[VAR[set]] [ [VAR[bc]] ].
]FIG]
:[ [N[2/0]], [N[7/15]] ]:
[FIG(steps)[
= [1721] Let [VAR[set]] be the result of
[[getting a G set][get a G set]]
[N[96]], [N[1]], [I[dtvcc]], [I[G2]].
= [1722] [[Emit][emit a character]]
[VAR[set]] [ [VAR[bc]] ].
]FIG]
:[ [N[8/0]], [N[9/15]] ]:
[FIG(steps)[
= [1723] Let [VAR[set]] be the result of
[[getting a C set][get a C set]]
[I[C1]], [I[dtvcc]], [I[C3]].
= [1724] [[Process a control character][process a control character]]
[VAR[set]] [ [VAR[bc]] ].
]FIG]
:[ [N[10/0]], [N[15/15]] ]:
[FIG(steps)[
= [1725] Let [VAR[set]] be the result of
[[getting a G set][get a G set]]
[N[96]], [N[1]], [I[dtvcc]], [I[G3]].
= [1726] [[Emit][emit a character]]
[VAR[set]] [ [VAR[bc]] ].
]FIG]
:Otherwise:
[FIG(steps)[
= [1727] [[Error][error]].
= [1728] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
= [1729] [[Reconsume][reconsume]] [VAR[bc]].
]FIG]
]FIG]
*** Left leading byte state
[482] The [DFN[left leading byte state]] switches by the [[bit combination]] [VAR[bc]]:
[FIG(switch)[
:[ [N[2/0]], [N[7/15]] ]:
[FIG(steps)[
= [495] Let [VAR[set]] be the result of
[[getting invoked set][get invoked set]] with
[VAR[state]] and [VAR[state]]'s [F[GL invoked]].
= [320] If [[is 96 size]] [VAR[set]] is [[false]] and
[VAR[bc]] is [N[2/0]] or [N[7/15]]:
== [323] [[Emit][emit a character]]
[[character]] ([I[unknown-byte]], [CODE[null]], [VAR[state]]'s [F[current I byte]]).
== [324] If [VAR[state]]'s [F[current J byte]] is ''not'' [CODE[null]]:
=== [325] [[Emit][emit a character]]
[[character]] ([I[unknown-byte]], [CODE[null]], [VAR[state]]'s [F[current J byte]]).
== [328] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [330] [[Reconsume][reconsume]] [VAR[bc]].
= [321] Otherwise:
== [496] Set [VAR[state]]'s [F[current bytes]] to [VAR[set]]'s [[byte length]].
== [449] If [VAR[state]]'s [F[current bytes]] is [N[2]]:
=== [331] Let [VAR[bytes]] be
[VAR[state]]'s [F[current I byte]] followed by [VAR[bc]].
=== [498] [[Emit a character][emit a character]] [VAR[set]] [ [VAR[bytes]] ].
=== [336] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [499] Otherwise, if [VAR[state]]'s [F[current bytes]] is [N[3]]:
=== [502] If [VAR[state]]'s [F[current J byte]] is [CODE[null]]:
==== [503] Set [VAR[state]]'s [F[current J byte]] to [VAR[bc]].
=== [504] Otherwise:
==== [335] Let [VAR[bytes]] be
[VAR[state]]'s [F[current I byte]] followed by
[VAR[state]]'s [F[current J byte]] followed by [VAR[bc]].
==== [501] [[Emit a character][emit a character]] [VAR[set]] [ [VAR[bytes]] ].
==== [337] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
]FIG]
:Otherwise:
[FIG(steps)[
= [492] [[Emit][emit a character]]
[[character]] ([I[unknown-byte]], [CODE[null]], [VAR[state]]'s [F[current I byte]]).
= [493] If [VAR[state]]'s [F[current J byte]] is ''not'' [CODE[null]]:
== [494] [[Emit][emit a character]]
[[character]] ([I[unknown-byte]], [CODE[null]], [VAR[state]]'s [F[current J byte]]).
= [483] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
= [485] [[Reconsume][reconsume]] [VAR[bc]].
]FIG]
]FIG]
*** Right leading byte state
[338] The [DFN[right leading byte state]] switches by the [[bit combination]] [VAR[bc]]:
[FIG(switch)[
:[ [N[2/1]], [N[7/14]] ]:
[FIG(steps)[
= [648] Let [VAR[set]] be the result of
[[getting RL invoked set][get RL invoked set]] with
[VAR[state]] and [VAR[state]]'s [F[GR invoked]].
= [649] If [VAR[set]] is [I[unassigned-94]]:
== [792] [[Emit][emit a character]]
[[character]] ([I[unknown-byte]], [CODE[null]], [VAR[state]]'s [F[current I byte]]).
== [793] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
== [794] [[Reconsume][reconsume]] [VAR[bc]].
= [795] Otherwise:
== [650] Let [VAR[bytes]] be
[VAR[state]]'s [F[current I byte]] followed by [VAR[bc]].
== [651] [[Emit a character][emit a character]] [VAR[set]] [ [VAR[bytes]] ].
== [687] Set [VAR[state]]'s [F[decoder state]] to [I[default state]].
]FIG]
:[ [N[10/0]], [N[15/15]] ]:
[FIG(steps)[
= [339] Let [VAR[set]] be the result of
[[getting invoked set][get invoked set]] with
[VAR[state]] and [VAR[state]]'s [F[GR invoked]].
= [340] If [[is 96 size]] [VAR[set]] is [[false]] and
[VAR[bc]] is [N[10/0]] or [N[15/15]]: