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P6Regex.pir
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P6Regex.pir
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=head1 TITLE
P6Regex - compiler and parser for Perl 6 regex
=over 4
=item C<compile_p6regex(PMC source, PMC adverbs :slurpy :named)>
Return the result of compiling C<source> according to Perl 6
regex syntax and the associated C<adverbs>. Normally this
function is obtained using C<compreg 'PGE::P6Regex'> instead
of calling it directly.
Returns the compiled regular expression. If a C<target>
named parameter is supplied, then it will return the parse tree
(target='parse'), the expression tree (target='exp'),
or the resulting PIR code (target='PIR').
=cut
.namespace [ 'PGE::P6Regex' ]
.sub 'compile_p6regex'
.param pmc source
.param pmc args :slurpy
.param pmc adverbs :slurpy :named
unless null adverbs goto set_adverbs
adverbs = new .Hash
set_adverbs:
$I0 = exists adverbs['grammar']
if $I0 goto with_grammar
unless args goto adverb_grammar_1
$S0 = shift args
adverbs['grammar'] = $S0
goto with_grammar
adverb_grammar_1:
adverbs['grammar'] = 'PGE::Grammar'
with_grammar:
$I0 = exists adverbs['name']
if $I0 goto with_name
unless args goto adverb_name_1
$S0 = shift args
adverbs['name'] = $S0
goto with_name
adverb_name_1:
adverbs['name'] = '_regex'
with_name:
$I0 = exists adverbs['lang']
if $I0 goto with_lang
adverbs['lang'] = 'PIR'
with_lang:
$I0 = exists adverbs['ignorecase']
if $I0 goto with_ignorecase
$I0 = adverbs['i']
adverbs['ignorecase'] = $I0
with_ignorecase:
$I0 = exists adverbs['words']
if $I0 goto with_words
$I0 = adverbs['w']
adverbs['words'] = $I0
with_words:
.local string target
target = adverbs['target']
## If we're passed the results of a previous parse, use it.
.local pmc match, exp
$I0 = isa source, 'PGE::Match'
if $I0 == 0 goto parse
$P0 = source['expr']
if null $P0 goto parse
$I0 = isa $P0, 'PGE::Exp'
if $I0 == 0 goto parse
match = source
goto analyze
parse:
## Let's parse the source as a regex
$P0 = find_global 'PGE::Grammar', 'regex'
match = $P0(source)
if target != 'parse' goto check
.return (match)
check:
unless match goto check_1
$S0 = source
$S1 = match
if $S0 == $S1 goto analyze
check_1:
null $P0
.return ($P0)
analyze:
.local pmc exp, pad
exp = match['expr']
pad = clone adverbs
$P0 = new .Hash
pad['lexscope'] = $P0
exp = exp.p6exp(pad)
if target != 'exp' goto pir
.return (exp)
pir:
.local pmc code
.local string grammar
grammar = adverbs['grammar']
code = new 'PGE::CodeString'
code.emit(".namespace [ '%0' ]", grammar)
$P0 = exp.root_pir(adverbs :flat :named)
code .= $P0
if target != 'PIR' goto bytecode
.return (code)
bytecode:
$P0 = compreg 'PIR'
$P1 = $P0(code)
make_grammar:
$I0 = find_type grammar
if $I0 > 0 goto end
$P0 = subclass 'PGE::Grammar', grammar
end:
.return ($P1)
.end
=item C<regex(PMC mob, PMC adverbs :slurpy :named)>
Parses a regex according to Perl 6 regex syntax, and returns
the corresponding parse tree. This is installed as a C<< <regex> >>
rule in C<PGE::Grammar>, so one can call it from another regex to
parse valid Perl 6 regular expressions.
=cut
.namespace [ 'PGE::Grammar' ]
.sub 'regex'
.param pmc mob
.param pmc adverbs :slurpy :named
.local pmc optable, match
optable = find_global 'PGE::P6Regex', '$optable'
match = optable.'parse'(mob)
.return (match)
.end
=item C<onload()>
Initializes the P6Regex parser and other data structures
needed for compiling regexes.
=cut
.include 'cclass.pasm'
.namespace [ 'PGE::P6Regex' ]
.sub '__onload' :load
.local pmc optable
$P0 = subclass 'PGE::Exp::Subrule', 'PGE::Exp::WS'
$P0 = subclass 'PGE::Exp', 'PGE::Exp::Alias'
optable = new 'PGE::OPTable'
store_global '$optable', optable
$P0 = find_global 'parse_term'
optable.newtok('term:', 'precedence'=>'=', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:^', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Anchor')
optable.newtok('term:^^', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Anchor')
optable.newtok('term:$$', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Anchor')
optable.newtok('term:\b', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Anchor')
optable.newtok('term:\B', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Anchor')
optable.newtok('term:.', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\d', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\D', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\s', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\S', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\w', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\W', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\N', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CCShortcut')
optable.newtok('term:\n', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Newline')
$P0 = find_global 'parse_dollar'
optable.newtok('term:$', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
$P0 = find_global 'parse_subrule'
optable.newtok('term:<', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:<?', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:<!', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
$P0 = find_global 'parse_enumcharlist'
optable.newtok('term:<[', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:<-[', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:<+[', 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('term:::', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Cut')
optable.newtok('term:<commit>', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Cut')
$P0 = find_global 'parse_closure'
optable.newtok("term:{{", 'equiv'=>'term:', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('circumfix:[ ]', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Group')
optable.newtok('circumfix:( )', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::CGroup')
$P0 = find_global 'parse_quant'
optable.newtok('postfix:*', 'looser'=>'term:', 'parsed'=>$P0)
optable.newtok('postfix:+', 'equiv'=>'postfix:*', 'parsed'=>$P0)
optable.newtok('postfix:?', 'equiv'=>'postfix:*', 'parsed'=>$P0)
optable.newtok('postfix::', 'equiv'=>'postfix:*', 'parsed'=>$P0)
optable.newtok('postfix:**', 'equiv'=>'postfix:*', 'parsed'=>$P0)
optable.newtok('term::::', 'equiv'=>'term:', 'nows'=>1, 'match'=>'PGE::Exp::Cut')
optable.newtok('infix:', 'looser'=>'postfix:*', 'assoc'=>'list', 'nows'=>1, 'match'=>'PGE::Exp::Concat')
optable.newtok('infix:&', 'looser'=>'infix:', 'nows'=>1, 'match'=>'PGE::Exp::Conj')
optable.newtok('infix:|', 'looser'=>'infix:&', 'nows'=>1, 'match'=>'PGE::Exp::Alt')
optable.newtok('infix::=', 'tighter'=>'infix:', 'assoc'=>'right', 'match'=>'PGE::Exp::Alias')
$P0 = find_global 'parse_modifier'
optable.newtok('prefix::', 'looser'=>'infix:|', 'nows'=>1, 'parsed'=>$P0)
optable.newtok('close:>', 'precedence'=>'<', 'nows'=>1)
optable.newtok('close:}', 'precedence'=>'<', 'nows'=>1)
.local pmc esclist
esclist = new .Hash
store_global '%esclist', esclist
esclist['e'] = "\e"
esclist['f'] = "\f"
esclist['r'] = "\r"
esclist['t'] = "\t"
esclist['v'] = unicode:"\x0a\x0b\x0c\x0d\x85\u2028\u2029"
esclist['h'] = unicode:"\x09\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000"
esclist['n'] = unicode:"\x0a\x0d\x0c\x85\u2028\u2029"
# See http://www.unicode.org/Public/UNIDATA/PropList.txt for above
# Create and store closure preprocessors in %closure_pp
$P0 = new .Hash
store_global 'PGE::P6Regex', '%closure_pp', $P0
$P1 = find_global 'PGE::P6Regex', 'PIR_closure'
$P0["PIR"] = $P1
$P0 = find_global 'compile_p6regex'
compreg 'PGE::P6Regex', $P0
.return ()
.end
=item C<parse_term(PMC mob [, PMC adverbs :slurpy :named])>
Parses literal strings and whitespace.
=cut
.sub 'parse_term'
.param pmc mob
.param pmc adverbs :slurpy :named
.local string target
.local int pos, lastpos
$P0 = getattribute mob, '$.target'
target = $P0
$P0 = getattribute mob, '$.pos'
pos = $P0
lastpos = length target
.local string initchar
$I0 = is_cclass .CCLASS_WHITESPACE, target, pos
if $I0 goto term_ws
initchar = substr target, pos, 1
$I0 = index '<>[](){}:*?+|&^$.', initchar
if $I0 >= 0 goto end_noterm
inc pos
if initchar == '#' goto term_ws
if initchar != "\\" goto term_literal
term_backslash:
$I0 = is_cclass .CCLASS_NUMERIC, target, pos
if $I0 goto err_backslash_digit
initchar = substr target, pos, 1
.local int isnegated
isnegated = is_cclass .CCLASS_UPPERCASE, target, pos
inc pos
$S0 = downcase initchar
if $S0 == 'x' goto term_backslash_x # \x.. \X..
if $S0 == 'o' goto term_backslash_o # \o.. \O..
$P0 = find_global '%esclist'
$I0 = exists $P0[$S0]
if $I0 == 0 goto term_literal
initchar = $P0[$S0]
if isnegated goto term_charlist
$I0 = length initchar
if $I0 < 2 goto term_literal
term_charlist:
(mob, $P99, $P99, $P0) = mob.newfrom(0, 'PGE::Exp::EnumCharList')
mob.'value'(initchar)
mob['isnegated'] = isnegated
$P0 = pos
.return (mob)
term_backslash_o:
.local int base
base = 8
goto term_bx0
term_backslash_x:
base = 16
term_bx0:
$I0 = 0
$S0 = substr target, pos, 1
$I2 = index "[{(<", $S0
if $I2 < 0 goto term_bx1
$S2 = substr "]})>", $I0
inc pos
term_bx1:
$S0 = substr target, pos, 1
downcase $S0
$I1 = index "0123456789abcdef", $S0
if $I1 < 0 goto term_bx2
if $I1 >= base goto term_bx2
$I0 *= base
$I0 += $I1
inc pos
goto term_bx1
term_bx2:
initchar = chr $I0
if $I2 < 0 goto term_bx3
$S0 = substr target, pos, 1
if $S0 != $S2 goto err_backslash_close
inc pos
term_bx3:
if isnegated goto term_charlist # \X[...], \000
# goto term_literal # \x[...], \000
term_literal:
.local int litstart, litlen
litstart = pos
litlen = 0
term_literal_loop:
if pos >= lastpos goto term_literal_end
$I0 = is_cclass .CCLASS_WHITESPACE, target, pos
if $I0 goto term_literal_end
$S0 = substr target, pos, 1
$I0 = index "<>[](){}:*?+\\|&#^$.", $S0
if $I0 >= 0 goto term_literal_end
inc pos
inc litlen
goto term_literal_loop
term_literal_end:
## for a multi-char literal, we don't eat the last chararacter
## in case it's quantified (it gets processed as a subsequent term)
if litlen < 1 goto term_literal_one
dec pos
term_literal_one:
$I0 = pos - litstart
$S0 = substr target, litstart, $I0
$S0 = concat initchar, $S0
(mob, $S99, $P99, $P0) = mob.newfrom(0, 'PGE::Exp::Literal')
mob.'value'($S0)
$P0 = pos
.return (mob)
term_ws:
.return 'parse_term_ws'(mob)
end_noterm:
(mob) = mob.newfrom(0, 'PGE::Exp::Literal')
.return (mob)
err_backslash_digit:
parse_error(mob, pos, "\\1 and \\012 illegal, use $1, \\o012, or \\x0a")
.return (mob)
err_backslash_close:
parse_error(mob, pos, "Missing close bracket for \\x..")
.end
=item C<parse_term_ws(PMC mob)>
Parses a whitespace term.
=cut
.sub 'parse_term_ws'
.param pmc mob
.local string target
.local pmc mfrom, mpos
.local int pos, lastpos
(mob, target, mfrom, mpos) = mob.newfrom(0, 'PGE::Exp::WS')
pos = mfrom
lastpos = length target
term_ws_loop:
## scan for the next non-whitespace character
pos = find_not_cclass .CCLASS_WHITESPACE, target, pos, lastpos
$S0 = substr target, pos, 1
if $S0 != '#' goto end
## we have a #-comment, determine its closing delimiter
inc pos
.local string closedelim
closedelim = "\n"
$S0 = substr target, pos, 1
$I0 = index '<[{(', $S0
if $I0 < 0 goto term_ws_loop_1
closedelim = substr '>]})', $I0, 1
term_ws_loop_1:
$I0 = index target, closedelim, pos
pos = $I0 + 1
if pos > 0 goto term_ws_loop
pos = lastpos
end:
mpos = pos
.return (mob)
.end
=item C<parse_quant(PMC mob)>
Parses a quantifier, such as *, +, ?, :, and all of their wonderous
combinations.
=cut
.sub 'parse_quant'
.param pmc mob
.local string target
.local pmc mfrom, mpos
.local pmc key
.local int pos, lastpos
key = mob['KEY']
(mob, target, mfrom, mpos) = mob.newfrom(0, 'PGE::Exp::Quant')
pos = mfrom
lastpos = length target
.local int min, max, suffixpos
.local string suffix
min = 1
max = 1
suffixpos = find_not_cclass .CCLASS_WHITESPACE, target, pos, lastpos
# The postfix:<::> operator may bring us here when it's really a
# term:<::> term. So, we check for that here and fail this match
# if we really have a cut term.
if key != ':' goto quant
$S0 = substr target, pos, 1
if $S0 == ':' goto end
mob['backtrack'] = PGE_BACKTRACK_NONE
goto quant_suffix_1
quant:
if key == '**' goto quant_closure
if key == '+' goto quant_max
min = 0
quant_max:
if key == '?' goto quant_suffix
max = PGE_INF
goto quant_suffix
quant_closure:
pos = find_not_cclass .CCLASS_WHITESPACE, target, pos, lastpos
$S0 = substr target, pos, 1
if $S0 != "{" goto err_closure
inc pos
$I1 = find_not_cclass .CCLASS_NUMERIC, target, pos, lastpos
if $I1 <= pos goto err_closure
$S0 = substr target, pos
min = $S0
max = $S0
pos = $I1
$S0 = substr target, pos, 2
if $S0 != '..' goto quant_closure_end
pos += 2
max = PGE_INF
$S0 = substr target, pos, 1
if $S0 == '.' goto quant_closure_end
$I1 = find_not_cclass .CCLASS_NUMERIC, target, pos, lastpos
if $I1 <= pos goto err_closure
$S0 = substr target, pos
max = $S0
pos = $I1
quant_closure_end:
$S0 = substr target, pos, 1
if $S0 != "}" goto err_closure
inc pos
suffixpos = find_not_cclass .CCLASS_WHITESPACE, target, pos, lastpos
quant_suffix:
suffix = substr target, suffixpos, 2
if suffix == ':?' goto quant_eager
if suffix == ':+' goto quant_greedy
quant_suffix_1:
suffix = substr target, suffixpos, 1
if suffix == '?' goto quant_eager
if suffix == '+' goto quant_greedy
if suffix != ':' goto quant_set
quant_none:
mob['backtrack'] = PGE_BACKTRACK_NONE
goto quant_skip_suffix
quant_eager:
mob['backtrack'] = PGE_BACKTRACK_EAGER
goto quant_skip_suffix
quant_greedy:
mob['backtrack'] = PGE_BACKTRACK_GREEDY
quant_skip_suffix:
$I0 = length suffix
pos = suffixpos + $I0
quant_set:
mob['min'] = min
mob['max'] = max
mpos = pos
end:
.return (mob)
err_closure:
parse_error(mob, pos, "Error in closure quantifier")
.end
=item C<parse_dollar(PMC mob)>
Parse things that begin with a dollar sign, such as scalars,
anchors, and match subscripts.
=cut
.sub "parse_dollar"
.param pmc mob
.local string target
.local int pos, lastpos
.local pmc newfrom, mfrom, mpos
.local string cname
newfrom = find_global 'PGE::Match', 'newfrom'
$P0 = getattribute mob, '$.target'
target = $P0
$P0 = getattribute mob, '$.pos'
pos = $P0
lastpos = length target
$S0 = substr target, pos, 1
if $S0 == '<' goto name
$I0 = find_not_cclass .CCLASS_NUMERIC, target, pos, lastpos
if $I0 > pos goto numeric
$I0 = find_not_cclass .CCLASS_WORD, target, pos, lastpos
if $I0 > pos goto scalar
eos_anchor:
(mob, $P0, mfrom, mpos) = newfrom(mob, 0, 'PGE::Exp::Anchor')
mpos = pos
.return (mob)
scalar:
(mob, $P0, mfrom, mpos) = newfrom(mob, 0, 'PGE::Exp::Scalar')
dec pos
$I1 = $I0 - pos
cname = substr target, pos, $I1
cname = concat '"', cname
cname = concat cname, '"'
mob["cname"] = cname
mpos = $I0
.return (mob)
numeric:
(mob, $P0, mfrom, mpos) = newfrom(mob, 0, 'PGE::Exp::Scalar')
$I1 = $I0 - pos
cname = substr target, pos, $I1
mob["cname"] = cname
mpos = $I0
.return (mob)
name:
inc pos
(mob, $P0, mfrom, mpos) = newfrom(mob, 0, "PGE::Exp::Scalar")
$I0 = index target, ">", pos
if $I0 < pos goto err_close
name_1:
$I1 = $I0 - pos
cname = substr target, pos, $I1
cname = escape cname
cname = concat '"', cname
cname = concat cname, '"'
mob["cname"] = cname
pos = $I0 + 1
mpos = pos
.return (mob)
err_close:
parse_error(mob, pos, "Missing close '>' in scalar")
.return (mob)
.end
=item C<parse_subrule(PMC mob)>
Parses a subrule token.
=cut
.sub 'parse_subrule'
.param pmc mob
.local string target
.local pmc mfrom, mpos
.local int pos, lastpos
.local string key
key = mob['KEY']
(mob, target, mfrom, mpos) = mob.newfrom(0, 'PGE::Exp::Subrule')
pos = mfrom
lastpos = length target
if key == '<?' goto nocapture
if key == '<!' goto negated
mob['iscapture'] = 1
goto subrule_name
negated:
mob['isnegated'] = 1
nocapture:
mob['iscapture'] = 0
subrule_name:
$I0 = pos
subrule_name_1:
pos = find_not_cclass .CCLASS_WORD, target, pos, lastpos
$S0 = substr target, pos, 2
if $S0 != '::' goto subrule_name_2
pos += 2
goto subrule_name_1
subrule_name_2:
$I1 = pos - $I0
.local string subname
subname = substr target, $I0, $I1
mob['subname'] = subname
$S0 = substr target, pos, 2
if $S0 == ': ' goto subrule_text_arg
$S0 = substr target, pos, 1
if $S0 != ' ' goto subrule_end
subrule_pattern_arg:
inc pos
mpos = pos
.local pmc regex
regex = find_global 'PGE::Grammar', 'regex'
$P1 = regex(mob)
unless $P1 goto end
$S0 = $P1
mob['arg'] = $S0
pos = $P1.to()
mpos = -1
goto subrule_end
subrule_text_arg:
pos += 2
$I0 = index target, '>', pos
if $I0 < 0 goto end
$I0 -= pos
$S0 = substr target, pos, $I0
mob['arg'] = $S0
pos += $I0
subrule_end:
$S0 = substr target, pos, 1
if $S0 != '>' goto end
inc pos
mpos = pos
$I0 = mob['iscapture']
if $I0 == 0 goto end
$S0 = escape subname
$S0 = concat '"', $S0
$S0 = concat $S0, '"'
mob['cname'] = $S0
end:
.return (mob)
.end
=item C<parse_enumcharlist(PMC mob)>
Extract an enumerated character list.
=cut
.sub "parse_enumcharlist"
.param pmc mob
.local string target
.local pmc mfrom, mpos
.local int pos, lastpos
.local int isrange
.local string charlist
.local string key
key = mob['KEY']
(mob, target, mfrom, mpos) = mob.newfrom(0, 'PGE::Exp::EnumCharList')
lastpos = length target
charlist = ''
pos = mfrom
isrange = 0
mob['isnegated'] = 0
if key != '<-[' goto scan
mob['isnegated'] = 1
scan:
if pos >= lastpos goto err_close
$S0 = substr target, pos, 1
if $S0 == ']' goto endclass
if $S0 == '-' goto err_hyphen
if $S0 == '.' goto dotrange
if $S0 != "\\" goto addchar
backslash:
inc pos
$S0 = substr target, pos, 1
$I0 = index 'nrtfae0', $S0
if $I0 == -1 goto addchar
$S0 = substr "\n\r\t\f\a\e\0", $I0, 1
addchar:
inc pos
if isrange goto addrange
charlist .= $S0
goto scan
addrange:
isrange = 0
$I2 = ord charlist, -1
$I0 = ord $S0
addrange_1:
inc $I2
if $I2 > $I0 goto scan
$S1 = chr $I2
charlist .= $S1
goto addrange_1
dotrange:
if isrange goto addrange
$S1 = substr target, pos, 2
if $S1 != ".." goto addchar
pos += 2
isrange = 1
goto scan
endclass:
$S0 = substr target, pos, 2
if $S0 != "]>" goto err_bracket
pos += 2
mpos = pos
mob.'value'(charlist)
goto end
err_bracket:
parse_error(mob, pos, "Unescaped ']' in charlist")
goto end
err_hyphen:
parse_error(mob, pos, "Unescaped '-' in charlist (use '..' or '\-')")
goto end
err_close:
parse_error(mob, pos, "No closing ']>' for charlist")
end:
.return (mob)
.end
=item C<parse_modifier>
Parse a modifier.
=cut
.sub 'parse_modifier'
.param pmc mob
.local int pos, lastpos
.local string target, value
.local pmc mfrom, mpos
.local string key
key = mob['KEY']
(mob, target, mfrom, mpos) = mob.newfrom(0, 'PGE::Exp::Modifier')
pos = mfrom
lastpos = length target
value = "1"
$I0 = pos
pos = find_not_cclass .CCLASS_NUMERIC, target, pos, lastpos
if pos == $I0 goto name
$I1 = pos - $I0
value = substr target, $I0, $I1
$I0 = pos
name:
pos = find_not_cclass .CCLASS_WORD, target, pos, lastpos
$I1 = pos - $I0
$S0 = substr target, $I0, $I1
mob['key'] = $S0
mob.'value'(value)
$S0 = substr target, pos, 1
if $S0 != '(' goto end
$I0 = pos + 1
pos = index target, ')', pos
$I1 = pos - $I0
$S0 = substr target, $I0, $I1
mob.'value'($S0)
inc pos
end:
### XXX pos = find_not_cclass .CCLASS_WHITESPACE, target, pos, lastpos
mpos = pos
.return (mob)
.end
.sub 'parse_closure'
.param pmc mob
.local pmc newfrom
.local string target
.local pmc mfrom, mpos
.local int pos, len
$P0 = find_global "PGE::Match", "newfrom"
(mob, target, mfrom, mpos) = $P0(mob, 0, "PGE::Exp::Closure")
pos = mfrom
len = 2
init:
$S0 = substr target, pos, 1
if $S0 != "{" goto body
inc len
inc pos
goto init
body:
$S0 = repeat "}", len
$I0 = index target, $S0, pos
if $I0 < pos goto err_noclose
$I1 = $I0 - pos
$S1 = substr target, pos, $I1
mob.'value'($S1)
pos = $I0 + len
mpos = pos
.return (mob)
err_noclose:
parse_error(mob, pos, "Missing closing braces for closure")
.return (mob)
.end
.sub 'parse_error'
.param pmc mob
.param int pos
.param string message
$P0 = getattribute mob, '$.pos'
$P0 = pos
$P0 = new .Exception
$S0 = 'p6rule parse error: '
$S0 .= message
$S0 .= ' at offset '
$S1 = pos
$S0 .= $S1
$S0 .= ", found '"
$P1 = getattribute mob, 'PGE::Match\x0$.target'
$S1 = $P1
$S1 = substr $S1, pos, 1
$S0 .= $S1
$S0 .= "'"
$P0['_message'] = $S0
throw $P0
.return ()
.end
.namespace [ 'PGE::Exp' ]
.sub 'p6exp' :method
.param pmc pad
.return (self)
.end
.namespace [ 'PGE::Exp::Literal' ]
.sub 'p6exp' :method
.param pmc pad
$I0 = pad['ignorecase']
self['ignorecase'] = $I0
.return (self)
.end
.namespace [ 'PGE::Exp::Concat' ]
.sub 'p6exp' :method
.param pmc pad
.local pmc array, exp
.local int i, j, n
array = self.get_array()
n = elements array
i = 0
j = 0
iter_loop:
if i >= n goto iter_end
exp = self[i]
inc i
exp = exp.p6exp(pad)
if null exp goto iter_loop
self[j] = exp
inc j
goto iter_loop
iter_end:
array = j
if j > 1 goto end
$P0 = array[0]
.return ($P0)
end:
.return (self)
.end
.namespace [ 'PGE::Exp::Quant' ]
.sub 'p6exp' :method
.param pmc pad
$I0 = exists self['backtrack']
if $I0 goto backtrack_done
self['backtrack'] = PGE_BACKTRACK_GREEDY
$I0 = pad['ratchet']
if $I0 == 0 goto backtrack_done
self['backtrack'] = PGE_BACKTRACK_NONE
backtrack_done:
.local pmc exp0
.local int isarray
isarray = pad['isarray']
pad['isarray'] = 1
exp0 = self[0]
exp0['isquant'] = 1
exp0 = exp0.p6exp(pad)
self[0] = exp0
pad['isarray'] = isarray
.return (self)
.end
.namespace [ 'PGE::Exp::Group' ]
.sub 'p6exp' :method
.param pmc pad
.local pmc exp0
$I0 = self['isquant']
if $I0 goto backtrack_done
$I0 = exists self['backtrack']
if $I0 goto backtrack_done
$I0 = pad['ratchet']
if $I0 == 0 goto backtrack_done
self['backtrack'] = PGE_BACKTRACK_NONE
backtrack_done:
exp0 = self[0]
exp0 = exp0.p6exp(pad)
self[0] = exp0
.return (self)
.end
.namespace [ 'PGE::Exp::CGroup' ]
.sub 'p6exp' :method
.param pmc pad
.local pmc exp
$I0 = self['isquant']
if $I0 goto backtrack_done
$I0 = exists self['backtrack']
if $I0 goto backtrack_done
$I0 = pad['ratchet']
if $I0 == 0 goto backtrack_done
self['backtrack'] = PGE_BACKTRACK_NONE
backtrack_done:
self['iscapture'] = 1
$I0 = exists self['isscope']
if $I0 goto set_cname
self['isscope'] = 1
set_cname:
$I0 = exists self['cname']
if $I0 goto set_subpats
$I0 = pad['subpats']
self['cname'] = $I0
set_subpats:
.local string cname
cname = self['cname']
$S0 = substr cname, 0, 1
if $S0 == '"' goto set_lexicals
$I0 = cname
inc $I0
pad['subpats'] = $I0
set_lexicals:
.local int isarray
isarray = 0
.local pmc lexscope
lexscope = pad['lexscope']
$I0 = exists lexscope[cname]
if $I0 == 0 goto set_lexicals_1
$P0 = lexscope[cname]
$P0['isarray'] = 1
isarray = 1
set_lexicals_1:
lexscope[cname] = self
.local int padarray
padarray = pad['isarray']
isarray |= padarray