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regcomp.sym: Reorder a couple of nodes
[perl5.git] / regcomp.sym
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1# regcomp.sym
2#
3# File has two sections, divided by a line of dashes '-'.
4#
5# Empty rows after #-comment are removed from input are ignored
6#
486ec47a 7# First section is for regops, second section is for regmatch-states
03363afd 8#
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9# Note that the order in this file is important.
10#
03363afd 11# Format for first section:
f9ef50a7 12# NAME \s+ TYPE, arg-description [flags] [num-args] [longjump-len] ; DESCRIPTION
03363afd 13#
3dab1dad 14#
c476f425 15# run perl regen.pl after editing this file
570aa4f2 16# Also update perlredebguts.pod
3dab1dad 17
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18
19
381b57db 20#* Exit points
1de06328 21
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22END END, no ; End of program.
23SUCCEED END, no ; Return from a subroutine, basically.
d09b2d29 24
381b57db 25#* Anchors:
1de06328 26
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27BOL BOL, no ; Match "" at beginning of line.
28MBOL BOL, no ; Same, assuming multiline.
29SBOL BOL, no ; Same, assuming singleline.
30EOS EOL, no ; Match "" at end of string.
31EOL EOL, no ; Match "" at end of line.
32MEOL EOL, no ; Same, assuming multiline.
33SEOL EOL, no ; Same, assuming singleline.
1e355c70 34BOUND BOUND, no ; Match "" at any word boundary using native charset semantics for non-utf8
f2284805 35BOUNDL BOUND, no ; Match "" at any locale word boundary
1e355c70 36BOUNDU BOUND, no ; Match "" at any word boundary using Unicode semantics
0c6e81eb 37BOUNDA BOUND, no ; Match "" at any word boundary using ASCII semantics
63ac0dad 38# All NBOUND nodes are required by a line regexec.c to be greater than all BOUND ones
1e355c70 39NBOUND NBOUND, no ; Match "" at any word non-boundary using native charset semantics for non-utf8
f2284805 40NBOUNDL NBOUND, no ; Match "" at any locale word non-boundary
1e355c70 41NBOUNDU NBOUND, no ; Match "" at any word non-boundary using Unicode semantics
0c6e81eb 42NBOUNDA NBOUND, no ; Match "" at any word non-boundary using ASCII semantics
f8abb37e 43GPOS GPOS, no ; Matches where last m//g left off.
d09b2d29 44
381b57db 45#* [Special] alternatives:
1de06328 46
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47REG_ANY REG_ANY, no 0 S ; Match any one character (except newline).
48SANY REG_ANY, no 0 S ; Match any one character.
49CANY REG_ANY, no 0 S ; Match any one byte.
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50ANYOF ANYOF, sv 0 S ; Match character in (or not in) this class, single char match only
51ANYOFV ANYOF, sv 0 V ; Match character in (or not in) this class, can match-multiple chars
fdf48794 52ALNUM ALNUM, no 0 S ; Match any alphanumeric character using native charset semantics for non-utf8
f9ef50a7 53ALNUML ALNUM, no 0 S ; Match any alphanumeric char in locale
fdf48794 54ALNUMU ALNUM, no 0 S ; Match any alphanumeric char using Unicode semantics
0c6e81eb 55ALNUMA ALNUM, no 0 S ; Match [A-Za-z_0-9]
fdf48794 56NALNUM NALNUM, no 0 S ; Match any non-alphanumeric character using native charset semantics for non-utf8
f9ef50a7 57NALNUML NALNUM, no 0 S ; Match any non-alphanumeric char in locale
fdf48794 58NALNUMU NALNUM, no 0 S ; Match any non-alphanumeric char using Unicode semantics
0c6e81eb 59NALNUMA NALNUM, no 0 S ; Match [^A-Za-z_0-9]
fdf48794 60SPACE SPACE, no 0 S ; Match any whitespace character using native charset semantics for non-utf8
f9ef50a7 61SPACEL SPACE, no 0 S ; Match any whitespace char in locale
fdf48794 62SPACEU SPACE, no 0 S ; Match any whitespace char using Unicode semantics
0c6e81eb 63SPACEA SPACE, no 0 S ; Match [ \t\n\f\r]
fdf48794 64NSPACE NSPACE, no 0 S ; Match any non-whitespace character using native charset semantics for non-utf8
f9ef50a7 65NSPACEL NSPACE, no 0 S ; Match any non-whitespace char in locale
fdf48794 66NSPACEU NSPACE, no 0 S ; Match any non-whitespace char using Unicode semantics
0c6e81eb 67NSPACEA NSPACE, no 0 S ; Match [^ \t\n\f\r]
fdf48794 68DIGIT DIGIT, no 0 S ; Match any numeric character using native charset semantics for non-utf8
28b5d7bf 69DIGITL DIGIT, no 0 S ; Match any numeric character in locale
0c6e81eb 70DIGITA DIGIT, no 0 S ; Match [0-9]
fdf48794 71NDIGIT NDIGIT, no 0 S ; Match any non-numeric character using native charset semantics for non-utf8
28b5d7bf 72NDIGITL NDIGIT, no 0 S ; Match any non-numeric character in locale
0c6e81eb 73NDIGITA NDIGIT, no 0 S ; Match [^0-9]
2448cf39 74CLUMP CLUMP, no 0 V ; Match any extended grapheme cluster sequence
d09b2d29 75
381b57db 76#* Alternation
1de06328 77
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78# BRANCH The set of branches constituting a single choice are hooked
79# together with their "next" pointers, since precedence prevents
80# anything being concatenated to any individual branch. The
81# "next" pointer of the last BRANCH in a choice points to the
82# thing following the whole choice. This is also where the
83# final "next" pointer of each individual branch points; each
84# branch starts with the operand node of a BRANCH node.
d09b2d29 85#
f9ef50a7 86BRANCH BRANCH, node 0 V ; Match this alternative, or the next...
d09b2d29 87
381b57db 88#*Back pointer
1de06328 89
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90# BACK Normal "next" pointers all implicitly point forward; BACK
91# exists to make loop structures possible.
d09b2d29 92# not used
f9ef50a7 93BACK BACK, no 0 V ; Match "", "next" ptr points backward.
d09b2d29 94
fab2782b 95#*Literals - NOTE the relative ordering of these types is important do not change it
1de06328 96
f8abb37e 97EXACT EXACT, str ; Match this string (preceded by length).
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98EXACTF EXACT, str ; Match this non-UTF-8 string (not guaranteed to be folded) using /id rules (w/len).
99EXACTFL EXACT, str ; Match this string (not guaranteed to be folded) using /il rules (w/len).
3c760661 100EXACTFU EXACT, str ; Match this string (folded iff in UTF-8, length in folding doesn't change if not in UTF-8) using /iu rules (w/len).
8c1182fd 101EXACTFA EXACT, str ; Match this string (not guaranteed to be folded) using /iaa rules (w/len).
3c760661 102EXACTFU_SS EXACT, str ; Match this string (folded iff in UTF-8, length in folding may change even if not in UTF-8) using /iu rules (w/len).
80acc8be 103EXACTFU_TRICKYFOLD EXACT, str ; Match this folded UTF-8 string using /iu rules
d09b2d29 104
381b57db 105#*Do nothing types
1de06328 106
f8abb37e 107NOTHING NOTHING, no ; Match empty string.
d09b2d29 108# A variant of above which delimits a group, thus stops optimizations
f8abb37e 109TAIL NOTHING, no ; Match empty string. Can jump here from outside.
d09b2d29 110
381b57db 111#*Loops
1de06328 112
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113# STAR,PLUS '?', and complex '*' and '+', are implemented as circular
114# BRANCH structures using BACK. Simple cases (one character
115# per match) are implemented with STAR and PLUS for speed
116# and to minimize recursive plunges.
d09b2d29 117#
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118STAR STAR, node 0 V ; Match this (simple) thing 0 or more times.
119PLUS PLUS, node 0 V ; Match this (simple) thing 1 or more times.
d09b2d29 120
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121CURLY CURLY, sv 2 V ; Match this simple thing {n,m} times.
122CURLYN CURLY, no 2 V ; Capture next-after-this simple thing
123CURLYM CURLY, no 2 V ; Capture this medium-complex thing {n,m} times.
124CURLYX CURLY, sv 2 V ; Match this complex thing {n,m} times.
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125
126# This terminator creates a loop structure for CURLYX
f9ef50a7 127WHILEM WHILEM, no 0 V ; Do curly processing and see if rest matches.
d09b2d29 128
381b57db 129#*Buffer related
1de06328 130
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131# OPEN,CLOSE,GROUPP ...are numbered at compile time.
132OPEN OPEN, num 1 ; Mark this point in input as start of #n.
133CLOSE CLOSE, num 1 ; Analogous to OPEN.
d09b2d29 134
f9ef50a7 135REF REF, num 1 V ; Match some already matched string
2448cf39 136REFF REF, num 1 V ; Match already matched string, folded using native charset semantics for non-utf8
f9ef50a7 137REFFL REF, num 1 V ; Match already matched string, folded in loc.
781aab5c 138# N?REFF[AU] could have been implemented using the FLAGS field of the
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139# regnode, but by having a separate node type, we can use the existing switch
140# statement to avoid some tests
141REFFU REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8
781aab5c 142REFFA REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8, no mixing ASCII, non-ASCII
d09b2d29 143
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144#*Named references. Code in regcomp.c assumes that these all are after the numbered references
145NREF REF, no-sv 1 V ; Match some already matched string
146NREFF REF, no-sv 1 V ; Match already matched string, folded using native charset semantics for non-utf8
147NREFFL REF, no-sv 1 V ; Match already matched string, folded in loc.
148NREFFU REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8
781aab5c 149NREFFA REF, num 1 V ; Match already matched string, folded using unicode semantics for non-utf8, no mixing ASCII, non-ASCII
1de06328 150
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151IFMATCH BRANCHJ, off 1 . 2 ; Succeeds if the following matches.
152UNLESSM BRANCHJ, off 1 . 2 ; Fails if the following matches.
153SUSPEND BRANCHJ, off 1 V 1 ; "Independent" sub-RE.
486ec47a 154IFTHEN BRANCHJ, off 1 V 1 ; Switch, should be preceded by switcher .
f8abb37e 155GROUPP GROUPP, num 1 ; Whether the group matched.
d09b2d29 156
381b57db 157#*Support for long RE
1de06328 158
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159LONGJMP LONGJMP, off 1 . 1 ; Jump far away.
160BRANCHJ BRANCHJ, off 1 V 1 ; BRANCH with long offset.
d09b2d29 161
381b57db 162#*The heavy worker
1de06328 163
f8abb37e 164EVAL EVAL, evl 1 ; Execute some Perl code.
d09b2d29 165
381b57db 166#*Modifiers
1de06328 167
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168MINMOD MINMOD, no ; Next operator is not greedy.
169LOGICAL LOGICAL, no ; Next opcode should set the flag only.
d09b2d29 170
381b57db 171# This is not used yet
f9ef50a7 172RENUM BRANCHJ, off 1 . 1 ; Group with independently numbered parens.
d09b2d29 173
381b57db 174#*Trie Related
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175
176# Behave the same as A|LIST|OF|WORDS would. The '..C' variants have
177# inline charclass data (ascii only), the 'C' store it in the structure.
486ec47a 178# NOTE: the relative order of the TRIE-like regops is significant
ce5e9471 179
7986cb47 180TRIE TRIE, trie 1 ; Match many EXACT(F[ALU]?)? at once. flags==type
f8abb37e 181TRIEC TRIE,trie charclass ; Same as TRIE, but with embedded charclass data
3dab1dad 182
1de06328 183# For start classes, contains an added fail table.
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184AHOCORASICK TRIE, trie 1 ; Aho Corasick stclass. flags==type
185AHOCORASICKC TRIE,trie charclass ; Same as AHOCORASICK, but with embedded charclass data
1de06328 186
381b57db 187#*Regex Subroutines
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188GOSUB GOSUB, num/ofs 2L ; recurse to paren arg1 at (signed) ofs arg2
189GOSTART GOSTART, no ; recurse to start of pattern
03363afd 190
381b57db 191#*Special conditionals
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192NGROUPP NGROUPP, no-sv 1 ; Whether the group matched.
193INSUBP INSUBP, num 1 ; Whether we are in a specific recurse.
194DEFINEP DEFINEP, none 1 ; Never execute directly.
0a4db386 195
486ec47a 196#*Backtracking Verbs
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197ENDLIKE ENDLIKE, none ; Used only for the type field of verbs
198OPFAIL ENDLIKE, none ; Same as (?!)
199ACCEPT ENDLIKE, parno 1 ; Accepts the current matched string.
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200
201
202#*Verbs With Arguments
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203VERB VERB, no-sv 1 ; Used only for the type field of verbs
204PRUNE VERB, no-sv 1 ; Pattern fails at this startpoint if no-backtracking through this
205MARKPOINT VERB, no-sv 1 ; Push the current location for rollback by cut.
206SKIP VERB, no-sv 1 ; On failure skip forward (to the mark) before retrying
207COMMIT VERB, no-sv 1 ; Pattern fails outright if backtracking through this
208CUTGROUP VERB, no-sv 1 ; On failure go to the next alternation in the group
e2e6a0f1 209
ee9b8eae 210#*Control what to keep in $&.
f8abb37e 211KEEPS KEEPS, no ; $& begins here.
ee9b8eae 212
e1d1eefb 213#*New charclass like patterns
f8abb37e 214LNBREAK LNBREAK, none ; generic newline pattern
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215VERTWS VERTWS, none 0 S ; vertical whitespace (Perl 6)
216NVERTWS NVERTWS, none 0 S ; not vertical whitespace (Perl 6)
217HORIZWS HORIZWS, none 0 S ; horizontal whitespace (Perl 6)
218NHORIZWS NHORIZWS, none 0 S ; not horizontal whitespace (Perl 6)
e1d1eefb 219
7fcd3a28 220
381b57db 221# NEW STUFF SOMEWHERE ABOVE THIS LINE
1de06328 222
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223################################################################################
224
7f69552c 225#*SPECIAL REGOPS
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226
227# This is not really a node, but an optimized away piece of a "long" node.
228# To simplify debugging output, we mark it as if it were a node
f8abb37e 229OPTIMIZED NOTHING, off ; Placeholder for dump.
1de06328 230
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231# Special opcode with the property that no opcode in a compiled program
232# will ever be of this type. Thus it can be used as a flag value that
233# no other opcode has been seen. END is used similarly, in that an END
234# node cant be optimized. So END implies "unoptimizable" and PSEUDO mean
235# "not seen anything to optimize yet".
f8abb37e 236PSEUDO PSEUDO, off ; Pseudo opcode for internal use.
1de06328 237
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238-------------------------------------------------------------------------------
239# Format for second section:
240# REGOP \t typelist [ \t typelist] [# Comment]
241# typelist= namelist
242# = namelist:FAIL
243# = name:count
244
245# Anything below is a state
246#
247#
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248TRIE next:FAIL
249EVAL AB:FAIL
250CURLYX end:FAIL
251WHILEM A_pre,A_min,A_max,B_min,B_max:FAIL
252BRANCH next:FAIL
253CURLYM A,B:FAIL
254IFMATCH A:FAIL
255CURLY B_min_known,B_min,B_max:FAIL
256COMMIT next:FAIL
257MARKPOINT next:FAIL
258SKIP next:FAIL
259CUTGROUP next:FAIL
260KEEPS next:FAIL