This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
regcomp.c; ([?...]) are single char width
[perl5.git] / regcomp.sym
CommitLineData
03363afd
YO
1# regcomp.sym
2#
3# File has two sections, divided by a line of dashes '-'.
4#
65aa4ca7
FC
5# Lines beginning with # are ignored, except for those that start with #*
6# which are included in pod/perldebguts.pod. # within a line may be part
7# of a description.
03363afd 8#
486ec47a 9# First section is for regops, second section is for regmatch-states
03363afd 10#
3dab1dad
YO
11# Note that the order in this file is important.
12#
03363afd 13# Format for first section:
e21ef692
KW
14# NAME \s+ TYPE, arg-description [struct regnode suffix] [flags] [longjump] ; DESCRIPTION
15# arg-description is currently unused
16# suffix is appended to 'struct_regnode_' giving which one to use. If empty,
17# it means plain 'struct regnode'. If the regnode is a string one, this
18# should instead refer to the base regnode, without the char[1] element
19# of the structure
46167d76 20# flag <S> means is REGNODE_SIMPLE; flag <V> means is REGNODE_VARIES; <.> is
e21ef692
KW
21# a placeholder
22# longjump is 1 if the (first) argument holds the next offset (instead of the
23# usual 'next_offset' field
3dab1dad 24#
c476f425 25# run perl regen.pl after editing this file
3dab1dad 26
e21ef692
KW
27# +- suffix of which struct regnode to use e.g.,
28# | +- flags (S or V) struct regnode_1
29# un- | | +- longjmp (0, blank, or 1) blank means 0
30# Name Type used | | | ; comment
31# --------------------------------------------------------------------------
32# IFMATCH BRANCHJ, off 1 . 1 ; Succeeds if the following matches.
33# UNLESSM BRANCHJ, off 1 . 1 ; Fails if the following matches.
34# SUSPEND BRANCHJ, off 1 V 1 ; "Independent" sub-RE.
35# IFTHEN BRANCHJ, off 1 V 1 ; Switch, should be preceded by switcher.
36# GROUPP GROUPP, num 1 ; Whether the group matched.
96bc7be8
KW
37#
38# If we were to start running out of regnodes, many of the ones that are
39# complements could be combined with their non-complement mates. For example,
40# POSIXU could have the flags field have the bottom bit mean do we complement
41# or not, and the type be shifted left 1 bit. Then all that would be needed to
42# extract which to do is a mask for the complement bit, and a right shift for
43# the other, an inconsequential increase in instructions. It might actually be
44# clearer and slightly faster given the case statement and assignment are
45# removed. Note that not everything could be collapsed: NPOSIXA, for example,
46# would require special handling for performance.
03363afd
YO
47
48
381b57db 49#* Exit points
1de06328 50
f8abb37e
NC
51END END, no ; End of program.
52SUCCEED END, no ; Return from a subroutine, basically.
d09b2d29 53
d3d47aac 54#* Line Start Anchors:
1645b83c 55#Note flags field for SBOL indicates if it is a /^/ or a /\A/
d3d47aac
YO
56SBOL BOL, no ; Match "" at beginning of line: /^/, /\A/
57MBOL BOL, no ; Same, assuming multiline: /^/m
58
59#* Line End Anchors:
60SEOL EOL, no ; Match "" at end of line: /$/
61MEOL EOL, no ; Same, assuming multiline: /$/m
62EOS EOL, no ; Match "" at end of string: /\z/
63
64#* Match Start Anchors:
65GPOS GPOS, no ; Matches where last m//g left off.
66
67#* Word Boundary Opcodes:
693fefec
KW
68# The regops that have varieties that vary depending on the character set regex
69# modifiers have to ordered thusly: /d, /l, /u, /a, /aa. This is because code
70# in regcomp.c uses the enum value of the modifier as an offset from the /d
71# version. The complements must come after the non-complements.
3018b823 72# BOUND, POSIX and their complements are affected, as well as EXACTF.
0991ffc9 73BOUND BOUND, no ; Like BOUNDA for non-utf8, otherwise like BOUNDU
c440a570 74BOUNDL BOUND, no ; Like BOUND/BOUNDU, but \w and \W are defined by current locale
912b808c 75BOUNDU BOUND, no ; Match "" at any boundary of a given type using /u rules.
c440a570 76BOUNDA BOUND, no ; Match "" at any boundary between \w\W or \W\w, where \w is [_a-zA-Z0-9]
693fefec 77# All NBOUND nodes are required by code in regexec.c to be greater than all BOUND ones
0991ffc9 78NBOUND NBOUND, no ; Like NBOUNDA for non-utf8, otherwise like BOUNDU
c440a570 79NBOUNDL NBOUND, no ; Like NBOUND/NBOUNDU, but \w and \W are defined by current locale
912b808c 80NBOUNDU NBOUND, no ; Match "" at any non-boundary of a given type using using /u rules.
c440a570 81NBOUNDA NBOUND, no ; Match "" betweeen any \w\w or \W\W, where \w is [_a-zA-Z0-9]
d09b2d29 82
381b57db 83#* [Special] alternatives:
f9ef50a7
NC
84REG_ANY REG_ANY, no 0 S ; Match any one character (except newline).
85SANY REG_ANY, no 0 S ; Match any one character.
46fc0c43
KW
86ANYOF ANYOF, sv charclass S ; Match character in (or not in) this class, single char match only
87ANYOFD ANYOF, sv charclass S ; Like ANYOF, but /d is in effect
88ANYOFL ANYOF, sv charclass S ; Like ANYOF, but /l is in effect
89ANYOFPOSIXL ANYOF, sv charclass_posixl S ; Like ANYOFL, but matches [[:posix:]] classes
f6eaa562
KW
90
91# Must be sequential
29a889ef 92ANYOFH ANYOF, sv 1 S ; Like ANYOF, but only has "High" matches, none in the bitmap; the flags field contains the lowest matchable UTF-8 start byte
a5bc0742 93ANYOFHb ANYOF, sv 1 S ; Like ANYOFH, but all matches share the same UTF-8 start byte, given in the flags field
3146c00a 94ANYOFHr ANYOF, sv 1 S ; Like ANYOFH, but the flags field contains packed bounds for all matchable UTF-8 start bytes.
53d42e43 95ANYOFHs ANYOF, sv 1 S ; Like ANYOFHb, but has a string field that gives the leading matchable UTF-8 bytes; flags field is len
2d5613be
KW
96ANYOFR ANYOFR, packed 1 S ; Matches any character in the range given by its packed args: upper 12 bits is the max delta from the base lower 20; the flags field contains the lowest matchable UTF-8 start byte
97ANYOFRb ANYOFR, packed 1 S ; Like ANYOFR, but all matches share the same UTF-8 start byte, given in the flags field
98# There is no ANYOFRr because khw doesn't think there are likely to be real-world cases where such a large range is used.
f6eaa562 99
ebee057d
KW
100ANYOFM ANYOFM, byte 1 S ; Like ANYOF, but matches an invariant byte as determined by the mask and arg
101NANYOFM ANYOFM, byte 1 S ; complement of ANYOFM
693fefec 102
d3d47aac 103#* POSIX Character Classes:
3018b823
KW
104# Order of the below is important. See ordering comment above.
105POSIXD POSIXD, none 0 S ; Some [[:class:]] under /d; the FLAGS field gives which one
106POSIXL POSIXD, none 0 S ; Some [[:class:]] under /l; the FLAGS field gives which one
107POSIXU POSIXD, none 0 S ; Some [[:class:]] under /u; the FLAGS field gives which one
3615ea58 108POSIXA POSIXD, none 0 S ; Some [[:class:]] under /a; the FLAGS field gives which one
3018b823
KW
109NPOSIXD NPOSIXD, none 0 S ; complement of POSIXD, [[:^class:]]
110NPOSIXL NPOSIXD, none 0 S ; complement of POSIXL, [[:^class:]]
111NPOSIXU NPOSIXD, none 0 S ; complement of POSIXU, [[:^class:]]
9e84774b 112NPOSIXA NPOSIXD, none 0 S ; complement of POSIXA, [[:^class:]]
3018b823 113# End of order is important
693fefec 114
2448cf39 115CLUMP CLUMP, no 0 V ; Match any extended grapheme cluster sequence
d09b2d29 116
381b57db 117#* Alternation
1de06328 118
65aa4ca7
FC
119#* BRANCH The set of branches constituting a single choice are
120#* hooked together with their "next" pointers, since
121#* precedence prevents anything being concatenated to
122#* any individual branch. The "next" pointer of the last
123#* BRANCH in a choice points to the thing following the
124#* whole choice. This is also where the final "next"
125#* pointer of each individual branch points; each branch
126#* starts with the operand node of a BRANCH node.
127#*
f9ef50a7 128BRANCH BRANCH, node 0 V ; Match this alternative, or the next...
d09b2d29 129
65aa4ca7
FC
130#*Literals
131# NOTE: the relative ordering of these types is important do not change it
1de06328 132
3ace85ea 133EXACT EXACT, str ; Match this string (flags field is the length).
ae06e581
KW
134
135#* In a long string node, the U32 argument is the length, and is
136#* immediately followed by the string.
137LEXACT EXACT, len:str 1; Match this long string (preceded by length; flags unused).
58ea1df2
KW
138EXACTL EXACT, str ; Like EXACT, but /l is in effect (used so locale-related warnings can be checked for)
139EXACTF EXACT, str ; Like EXACT, but match using /id rules; (string not UTF-8, ASCII folded; non-ASCII not)
140EXACTFL EXACT, str ; Like EXACT, but match using /il rules; (string not likely to be folded)
141EXACTFU EXACT, str ; Like EXACT, but match using /iu rules; (string folded)
142
143# The reason MICRO and SHARP S aren't folded in non-UTF8 patterns is because
144# they would fold to something that requires UTF-8. SHARP S would normally
145# fold to 'ss', but because of /aa, it instead folds to a pair of LATIN SMALL
146# LETTER LONG S characters (U+017F)
147EXACTFAA EXACT, str ; Like EXACT, but match using /iaa rules; (string folded except in non-UTF8 patterns: MICRO, SHARP S; folded length <= unfolded)
2f306ab9
KW
148
149# End of important relative ordering.
150
58ea1df2 151EXACTFUP EXACT, str ; Like EXACT, but match using /iu rules; (string not UTF-8, folded except MICRO, SHARP S: hence Problematic)
aa419ff3
KW
152# In order for a non-UTF-8 EXACTFAA to think the pattern is pre-folded when
153# matching a UTF-8 target string, there would have to be something like an
154# EXACTFAA_MICRO which would not be considered pre-folded for UTF-8 targets,
155# since the fold of the MICRO SIGN would not be done, and would be
156# representable in the UTF-8 target string.
157
58ea1df2
KW
158EXACTFLU8 EXACT, str ; Like EXACTFU, but use /il, UTF-8, (string is folded, and everything in it is above 255
159EXACTFAA_NO_TRIE EXACT, str ; Like EXACT, but match using /iaa rules (string not UTF-8, not guaranteed to be folded, not currently trie-able)
d09b2d29 160
4f4c2c24 161
3f2416ae
KW
162EXACT_REQ8 EXACT, str ; Like EXACT, but only UTF-8 encoded targets can match
163LEXACT_REQ8 EXACT, len:str 1 ; Like LEXACT, but only UTF-8 encoded targets can match
164EXACTFU_REQ8 EXACT, str ; Like EXACTFU, but only UTF-8 encoded targets can match
efec1f81 165# One could add EXACTFAA8 and something that has the same effect for /l,
a9f8c7ac 166# but these would be extremely uncommon
f6b4b99d 167
58ea1df2 168EXACTFU_S_EDGE EXACT, str ; /di rules, but nothing in it precludes /ui, except begins and/or ends with [Ss]; (string not UTF-8; compile-time only)
8a100c91 169
381b57db 170#*Do nothing types
1de06328 171
f8abb37e 172NOTHING NOTHING, no ; Match empty string.
65aa4ca7 173#*A variant of above which delimits a group, thus stops optimizations
f8abb37e 174TAIL NOTHING, no ; Match empty string. Can jump here from outside.
d09b2d29 175
381b57db 176#*Loops
1de06328 177
65aa4ca7 178#* STAR,PLUS '?', and complex '*' and '+', are implemented as
62e6ef33 179#* circular BRANCH structures. Simple cases
65aa4ca7
FC
180#* (one character per match) are implemented with STAR
181#* and PLUS for speed and to minimize recursive plunges.
182#*
f9ef50a7
NC
183STAR STAR, node 0 V ; Match this (simple) thing 0 or more times.
184PLUS PLUS, node 0 V ; Match this (simple) thing 1 or more times.
d09b2d29 185
f9ef50a7
NC
186CURLY CURLY, sv 2 V ; Match this simple thing {n,m} times.
187CURLYN CURLY, no 2 V ; Capture next-after-this simple thing
188CURLYM CURLY, no 2 V ; Capture this medium-complex thing {n,m} times.
189CURLYX CURLY, sv 2 V ; Match this complex thing {n,m} times.
d09b2d29 190
65aa4ca7 191#*This terminator creates a loop structure for CURLYX
f9ef50a7 192WHILEM WHILEM, no 0 V ; Do curly processing and see if rest matches.
d09b2d29 193
381b57db 194#*Buffer related
1de06328 195
65aa4ca7 196#*OPEN,CLOSE,GROUPP ...are numbered at compile time.
f8abb37e 197OPEN OPEN, num 1 ; Mark this point in input as start of #n.
48e88d42 198CLOSE CLOSE, num 1 ; Close corresponding OPEN of #n.
07093db4
KW
199SROPEN SROPEN, none ; Same as OPEN, but for script run
200SRCLOSE SRCLOSE, none ; Close preceding SROPEN
d09b2d29 201
f9ef50a7 202REF REF, num 1 V ; Match some already matched string
912b808c
KW
203REFF REF, num 1 V ; Match already matched string, using /di rules.
204REFFL REF, num 1 V ; Match already matched string, using /li rules.
781aab5c 205# N?REFF[AU] could have been implemented using the FLAGS field of the
01f98ec2
KW
206# regnode, but by having a separate node type, we can use the existing switch
207# statement to avoid some tests
912b808c
KW
208REFFU REF, num 1 V ; Match already matched string, usng /ui.
209REFFA REF, num 1 V ; Match already matched string, using /aai rules.
d09b2d29 210
65aa4ca7
FC
211#*Named references. Code in regcomp.c assumes that these all are after
212#*the numbered references
016b7209
KW
213REFN REF, no-sv 1 V ; Match some already matched string
214REFFN REF, no-sv 1 V ; Match already matched string, using /di rules.
215REFFLN REF, no-sv 1 V ; Match already matched string, using /li rules.
216REFFUN REF, num 1 V ; Match already matched string, using /ui rules.
217REFFAN REF, num 1 V ; Match already matched string, using /aai rules.
1de06328 218
d3d47aac
YO
219#*Support for long RE
220LONGJMP LONGJMP, off 1 . 1 ; Jump far away.
221BRANCHJ BRANCHJ, off 1 V 1 ; BRANCH with long offset.
222
223#*Special Case Regops
2abbd513
KW
224IFMATCH BRANCHJ, off 1 . 1 ; Succeeds if the following matches; non-zero flags "f", next_off "o" means lookbehind assertion starting "f..(f-o)" characters before current
225UNLESSM BRANCHJ, off 1 . 1 ; Fails if the following matches; non-zero flags "f", next_off "o" means lookbehind assertion starting "f..(f-o)" characters before current
f9ef50a7 226SUSPEND BRANCHJ, off 1 V 1 ; "Independent" sub-RE.
65aa4ca7 227IFTHEN BRANCHJ, off 1 V 1 ; Switch, should be preceded by switcher.
f8abb37e 228GROUPP GROUPP, num 1 ; Whether the group matched.
d09b2d29 229
381b57db 230#*The heavy worker
1de06328 231
13f27704 232EVAL EVAL, evl/flags 2L ; Execute some Perl code.
d09b2d29 233
381b57db 234#*Modifiers
1de06328 235
f8abb37e
NC
236MINMOD MINMOD, no ; Next operator is not greedy.
237LOGICAL LOGICAL, no ; Next opcode should set the flag only.
d09b2d29 238
65aa4ca7 239#*This is not used yet
f9ef50a7 240RENUM BRANCHJ, off 1 . 1 ; Group with independently numbered parens.
d09b2d29 241
381b57db 242#*Trie Related
1de06328 243
65aa4ca7
FC
244#* Behave the same as A|LIST|OF|WORDS would. The '..C' variants
245#* have inline charclass data (ascii only), the 'C' store it in the
246#* structure.
486ec47a 247# NOTE: the relative order of the TRIE-like regops is significant
ce5e9471 248
7986cb47 249TRIE TRIE, trie 1 ; Match many EXACT(F[ALU]?)? at once. flags==type
f8abb37e 250TRIEC TRIE,trie charclass ; Same as TRIE, but with embedded charclass data
3dab1dad 251
1de06328 252# For start classes, contains an added fail table.
f8abb37e
NC
253AHOCORASICK TRIE, trie 1 ; Aho Corasick stclass. flags==type
254AHOCORASICKC TRIE,trie charclass ; Same as AHOCORASICK, but with embedded charclass data
1de06328 255
381b57db 256#*Regex Subroutines
f8abb37e 257GOSUB GOSUB, num/ofs 2L ; recurse to paren arg1 at (signed) ofs arg2
03363afd 258
381b57db 259#*Special conditionals
016b7209 260GROUPPN GROUPPN, no-sv 1 ; Whether the group matched.
f8abb37e
NC
261INSUBP INSUBP, num 1 ; Whether we are in a specific recurse.
262DEFINEP DEFINEP, none 1 ; Never execute directly.
0a4db386 263
486ec47a 264#*Backtracking Verbs
f8abb37e 265ENDLIKE ENDLIKE, none ; Used only for the type field of verbs
fee50582
YO
266OPFAIL ENDLIKE, no-sv 1 ; Same as (?!), but with verb arg
267ACCEPT ENDLIKE, no-sv/num 2L ; Accepts the current matched string, with verbar
5d458dd8
YO
268
269#*Verbs With Arguments
f8abb37e
NC
270VERB VERB, no-sv 1 ; Used only for the type field of verbs
271PRUNE VERB, no-sv 1 ; Pattern fails at this startpoint if no-backtracking through this
272MARKPOINT VERB, no-sv 1 ; Push the current location for rollback by cut.
273SKIP VERB, no-sv 1 ; On failure skip forward (to the mark) before retrying
274COMMIT VERB, no-sv 1 ; Pattern fails outright if backtracking through this
275CUTGROUP VERB, no-sv 1 ; On failure go to the next alternation in the group
e2e6a0f1 276
ee9b8eae 277#*Control what to keep in $&.
f8abb37e 278KEEPS KEEPS, no ; $& begins here.
ee9b8eae 279
e1d1eefb 280#*New charclass like patterns
f8abb37e 281LNBREAK LNBREAK, none ; generic newline pattern
3172e3fd 282
381b57db 283# NEW STUFF SOMEWHERE ABOVE THIS LINE
1de06328 284
03363afd
YO
285################################################################################
286
7f69552c 287#*SPECIAL REGOPS
1de06328 288
65aa4ca7
FC
289#* This is not really a node, but an optimized away piece of a "long"
290#* node. To simplify debugging output, we mark it as if it were a node
f8abb37e 291OPTIMIZED NOTHING, off ; Placeholder for dump.
1de06328 292
65aa4ca7
FC
293#* Special opcode with the property that no opcode in a compiled program
294#* will ever be of this type. Thus it can be used as a flag value that
295#* no other opcode has been seen. END is used similarly, in that an END
296#* node cant be optimized. So END implies "unoptimizable" and PSEUDO
297#* mean "not seen anything to optimize yet".
f8abb37e 298PSEUDO PSEUDO, off ; Pseudo opcode for internal use.
1de06328 299
03363afd
YO
300-------------------------------------------------------------------------------
301# Format for second section:
65aa4ca7 302# REGOP \t typelist [ \t typelist]
03363afd
YO
303# typelist= namelist
304# = namelist:FAIL
305# = name:count
306
307# Anything below is a state
308#
309#
f8abb37e 310TRIE next:FAIL
4ee16520 311EVAL B,postponed_AB:FAIL
f8abb37e
NC
312CURLYX end:FAIL
313WHILEM A_pre,A_min,A_max,B_min,B_max:FAIL
314BRANCH next:FAIL
315CURLYM A,B:FAIL
316IFMATCH A:FAIL
21cbe009 317CURLY B_min,B_max:FAIL
f8abb37e
NC
318COMMIT next:FAIL
319MARKPOINT next:FAIL
320SKIP next:FAIL
321CUTGROUP next:FAIL
322KEEPS next:FAIL