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Actually, write the torrc format in ABNF

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This should make it more clear what I meant, if you know how to read ABNF.

(Thanks to rl1987 for correcting numerous issues here)
This commit is contained in:
Nick Mathewson 2015-07-21 14:40:22 -04:00
parent 7521c3ee91
commit 9d237bb00a
1 changed files with 43 additions and 45 deletions
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88
doc/torrc_format.txt
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@ -14,68 +14,66 @@ does, not what it should do.
1. File Syntax
# A file is interpreted as every Entry in the file, in order.
TorrcFile = Line*
; The syntax here is defined an Augmented Backus-Naur form, as
; specified in RFC5234.
Line = BlankLine | Entry
; A file is interpreted as every Entry in the file, in order.
TorrcFile = *Line
BlankLine = WS* OptComment LF
| WS* LF
Line = BlankLine / Entry
OptComment =
| Comment
BlankLine = *WSP OptComment LF
BlankLine =/ *WSP LF
Comment = '#' NonLF*
OptComment = [ Comment ]
# Each Entry is interpreted as an optional "Magic" flag, a key, and a
# value.
Entry = SP* OptMagic Key (SP+ | '\\' NL SP*)+ Val LF
| SP* OptMagic Key (SP* | '\\' NL SP*)* LF
Comment = "#" *NonLF
OptMagic =
| "+"
| "/"
; Each Entry is interpreted as an optional "Magic" flag, a key, and a
; value.
Entry = *WSP [ Magic ] Key 1*(1*WSP / "\" NL *WSP) Val LF
Entry =/ *WSP [ Magic ] Key *( *WSP / "\" NL *WSP) LF
# Keys are always specified verbatim. They are case insensitive. It
# is an error to specify a key that Tor does not recognize.
Key = KC*
Magic = "+" / "/"
# Sadly, every kind of value is decoded differently...
Val = QuotedVal | ContinuedVal | PlainVal
; Keys are always specified verbatim. They are case insensitive. It
; is an error to specify a key that Tor does not recognize.
Key = 1*KC
# The text of a PlainVal is the text of its PVBody portion,
# plus the optional trailing backslash.
PlainVal = PVBody* ('\\')? SP* OptComment
; Sadly, every kind of value is decoded differently...
Val = QuotedVal / ContinuedVal / PlainVal
# Note that a PVBody is copied verbatim. Slashes are included
# verbatim. No changes are made. Note that a body may be empty.
PVBody = (VC | '\\' NonLF ) *
; The text of a PlainVal is the text of its PVBody portion,
; plus the optional trailing backslash.
PlainVal = PVBody [ "\" ] *WSP OptComment
# The text of a ContinuedVal is the text of each of its PVBody
# sub-elements, in order, concatenated.
ContinuedVal = CVal1 CVal2* CVal3
; Note that a PVBody is copied verbatim. Slashes are included
; verbatim. No changes are made. Note that a body may be empty.
PVBody = * (VC / "\" NonLF )
CVal1 = PVBody '\\' LF
CVal2 = PVBody ( '\\' LF | Comment LF )
; The text of a ContinuedVal is the text of each of its PVBody
; sub-elements, in order, concatenated.
ContinuedVal = CVal1 *CVal2 CVal3
CVal1 = PVBody "\" LF
CVal2 = PVBody ( "\" LF / Comment LF )
CVal3 = PVBody
# The text of a QuotedVal is decoded as if it were a C string.
QuotedVal = DQ QVBody DQ SP* Comment
; The text of a QuotedVal is decoded as if it were a C string.
QuotedVal = DQ QVBody DQ *WSP Comment
QVBody = QC
| '\\' ( 'n' | 'r' | 't' | '\\' | '\'' | DQ | 'x' XD XD | OD OD? OD? )
QVBody = QC
QVBody =/ "\" ( "n" / "r" / "t" / "\" / "'" / DQUOTE )
QVBOdy =/ "\" ( "x" 2HEXDIG / 1*3OCTDIG )
XD = any hexadecimal digit
OD = any octal digit
; Anything besides NUL and LF
NonLF = %x01-%x09 / %x0b - %xff
NonLF = Any character but '\n'
LF = '\n' | EOF
WS = ' ' | '\t' | '\r'
SP = ' ' | '\t'
DQ = '\"'
KC = Any character except an isspace() character or '#'
VC = Any character except '\\', '\n', or '#'
QC = Any character except '\n', '\\', or '\"'
OCTDIG = '0' - '7'
KC = Any character except an isspace() character or '#' or NUL
VC = Any character except '\\', '\n', '#', or NUL
QC = Any character except '\n', '\\', '\"', or NUL
2. Mid-level Semantics