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Cursor.pm
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Cursor.pm
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my class Cursor does NQPCursorRole {
has $!made; # Need it to survive re-creations of the match object.
my Mu $EMPTY_LIST := nqp::list();
my Mu $NO_CAPS := nqp::hash();
multi method Bool(Cursor:D:) {
nqp::getattr_i(self, Cursor, '$!pos') >= nqp::getattr_i(self, Cursor, '$!from')
}
method MATCH() {
my $match := nqp::getattr(self, Cursor, '$!match');
return $match if nqp::istype($match, Match) && nqp::isconcrete($match);
$match := nqp::create(Match);
nqp::bindattr($match, Match, '$!orig', nqp::findmethod(self, 'orig')(self));
my int $from = nqp::getattr_i(self, Cursor, '$!from');
my int $to = nqp::getattr_i(self, Cursor, '$!pos');
nqp::bindattr_i($match, Match, '$!from', $from);
nqp::bindattr_i($match, Match, '$!to', $to);
nqp::bindattr($match, Match, '$!made', nqp::getattr(self, Cursor, '$!made'));
nqp::bindattr($match, Match, '$!CURSOR', self);
my Mu $list;
my Mu $hash := nqp::hash();
if $to >= $from {
# For captures with lists, initialize the lists.
my $caplist := $NO_CAPS;
my $rxsub := nqp::getattr(self, Cursor, '$!regexsub');
if !nqp::isnull($rxsub) && nqp::defined($rxsub) {
$caplist := nqp::can($rxsub, 'CAPS') ?? nqp::findmethod($rxsub, 'CAPS')($rxsub) !! nqp::null();
if !nqp::isnull($caplist) && nqp::istrue($caplist) {
my $iter := nqp::iterator($caplist);
while $iter {
my $curcap := nqp::shift($iter);
#?if jvm
my Mu $curval := nqp::iterval($curcap);
if (nqp::isint($curval) && nqp::isge_i($curval, 2))
|| (nqp::isnum($curval) && nqp::p6box_n($curval) >= 2) {
#?endif
#?if !jvm
if nqp::iterval($curcap) >= 2 {
#?endif
my str $name = nqp::iterkey_s($curcap);
nqp::iscclass(nqp::const::CCLASS_NUMERIC, $name, 0)
?? nqp::bindpos(
nqp::if(nqp::isconcrete($list), $list, ($list := nqp::list())),
nqp::fromstr_I($name, Int), [])
!! nqp::bindkey($hash, $name, []);
}
}
}
}
# Walk the Cursor stack and populate the Cursor.
my Mu $cs := nqp::getattr(self, Cursor, '$!cstack');
if !nqp::isnull($cs) && nqp::istrue($cs) {
my int $cselems = nqp::elems($cs);
my int $csi = 0;
while $csi < $cselems {
my Mu $subcur := nqp::atpos($cs, $csi);
my Mu $submatch := $subcur.MATCH;
my Mu $name := nqp::getattr($subcur, $?CLASS, '$!name');
if !nqp::isnull($name) && nqp::defined($name) {
if $name ne '' && nqp::eqat($name, '$', 0) && ($name eq '$!from' || $name eq '$!to') {
nqp::bindattr_i($match, Match, $name, $submatch.from);
}
elsif nqp::index($name, '=') < 0 {
my Mu $capval := nqp::atkey($caplist, $name);
#?if jvm
my int $needs_list = nqp::isconcrete($capval) &&
((nqp::isint($capval) && nqp::isge_i($capval, 2)) ||
(nqp::isnum($capval) && nqp::p6box_n($capval) >= 2));
#?endif
#?if !jvm
my int $needs_list = nqp::isconcrete($capval) && $capval >= 2;
#?endif
if nqp::iscclass(nqp::const::CCLASS_NUMERIC, $name, 0) {
$list := nqp::list() unless nqp::isconcrete($list);
$needs_list
?? nqp::atpos($list, nqp::fromstr_I(nqp::unbox_s($name), Int)).push($submatch)
!! nqp::bindpos($list, nqp::fromstr_I(nqp::unbox_s($name), Int), $submatch);
}
else {
$needs_list
?? nqp::atkey($hash, $name).push($submatch)
!! nqp::bindkey($hash, $name, $submatch);
}
}
else {
my Mu $names := nqp::split('=', $name);
my $iter := nqp::iterator($names);
while $iter {
my str $name = nqp::unbox_s(nqp::shift($iter));
my Mu $capval := nqp::atkey($caplist, $name);
#?if jvm
my int $needs_list = nqp::isconcrete($capval) &&
((nqp::isint($capval) && nqp::isge_i($capval, 2)) ||
(nqp::isnum($capval) && nqp::p6box_n($capval) >= 2));
#?endif
#?if !jvm
my int $needs_list = nqp::isconcrete($capval) && $capval >= 2;
#?endif
if nqp::iscclass(nqp::const::CCLASS_NUMERIC, $name, 0) {
$list := nqp::list() unless nqp::isconcrete($list);
$needs_list
?? nqp::atpos($list, nqp::fromstr_I($name, Int)).push($submatch)
!! nqp::bindpos($list, nqp::fromstr_I($name, Int), $submatch);
}
else {
$needs_list
?? nqp::atkey($hash, $name).push($submatch)
!! nqp::bindkey($hash, $name, $submatch);
}
}
}
}
$csi = nqp::add_i($csi, 1);
}
}
}
nqp::bindattr($match, Capture, '$!list', nqp::isconcrete($list) ?? $list !! $EMPTY_LIST);
nqp::bindattr($match, Capture, '$!hash', $hash);
nqp::bindattr(self, Cursor, '$!match', $match);
# Once we've produced the captures, and if we know we're finished and
# will never be backtracked into, we can release cstack and regexsub.
unless nqp::defined(nqp::getattr(self, Cursor, '$!bstack')) {
nqp::bindattr(self, Cursor, '$!cstack', nqp::null());
nqp::bindattr(self, Cursor, '$!regexsub', nqp::null());
}
$match;
}
method MATCH_SAVE() {
nqp::getattr_i(self, Cursor, '$!pos') < 0 ?? Nil !! self.MATCH()
}
# INTERPOLATE will iterate over the string $tgt beginning at position 0.
# If it can't match against pattern var (or any element of var if it is an array)
# it will increment $pos and try again. Therefor it is important to only match
# against the current position.
# $i is case insensitive flag
# $s is for sequential matching instead of junctive
# $a is true if we are in an assertion
method INTERPOLATE(\var, $i = 0, $s = 0, $a = 0) {
if nqp::isconcrete(var) {
# Call it if it is a routine. This will capture if requested.
return (var)(self) if nqp::istype(var,Callable);
my $maxlen := -1;
my $cur := self.'!cursor_start_cur'();
my $pos := nqp::getattr_i($cur, $?CLASS, '$!from');
my $tgt := $cur.target;
my $eos := nqp::chars($tgt);
my $fate := 0;
my $count := 0;
my $start := 1;
my Mu $alts := nqp::list();
my Mu $order := nqp::list();
if nqp::istype(var, Positional) and !nqp::iscont(var) {
if $s {
# The order matters for sequential matching, therefor no NFA involved.
nqp::push($order,$_) for var.list;
}
else {
my Mu $nfa := QRegex::NFA.new;
# prepare to run the NFA if var is array-ish.
for var.list -> $topic {
nqp::push($alts, $topic);
if $a {
# We are in a regex assertion, the strings we get will be treated as
# regex rules.
return $cur.'!cursor_start_cur'()
if nqp::istype($topic,Associative);
my $rx := MAKE_REGEX($topic, :$i);
my Mu $nfas := nqp::findmethod($rx, 'NFA')($rx);
$nfa.mergesubstates($start, 0, $fate, $nfas, Mu);
}
elsif nqp::istype($topic,Regex) {
# A Regex already.
my Mu $nfas := nqp::findmethod($topic, 'NFA')($topic);
$nfa.mergesubstates($start, 0, $fate, $nfas, Mu);
}
else {
# The pattern is a string.
my Mu $lit := QAST::Regex.new( :rxtype<literal>, $topic,
:subtype( $i ?? 'ignorecase' !! '') );
my Mu $nfa2 := QRegex::NFA.new;
my Mu $node := nqp::findmethod($nfa2, 'addnode')($nfa2, $lit);
my Mu $save := nqp::findmethod($node, 'save')($node, :non_empty(1));
$nfa.mergesubstates($start, 0, $fate, $save, Mu);
}
$fate := $fate + 1;
}
# Now run the NFA
my Mu $fates := nqp::findmethod($nfa, 'run')($nfa, $tgt, $pos);
$fate := 0;
$count := nqp::elems($fates);
while nqp::islt_i($fate, $count) {
my $thing := nqp::atpos_i($fates, $fate);
nqp::push($order, nqp::atpos($alts, $thing));
$fate := nqp::add_i($fate, 1);
}
}
}
else {
# Use the var as it is if it's not array-ish.
nqp::push($order, var);
}
my int $omax = nqp::elems($order);
loop (my int $o = 0; $o < $omax; $o = $o + 1) {
my Mu $topic := nqp::atpos($order,$o);
my $match;
my $len;
if $a {
# We are in a regex assertion, the strings we get will be treated as
# regex rules.
return $cur.'!cursor_start_cur'()
if nqp::istype($topic,Associative);
my $rx := MAKE_REGEX($topic, :$i);
$match := (nqp::substr($tgt, $pos, $eos - $pos) ~~ $rx).Str;
$len := nqp::chars( $match );
}
elsif nqp::istype($topic,Regex) {
# A Regex already.
$match := nqp::substr($tgt, $pos, $eos - $pos) ~~ $topic;
# In order to return the correct result we need to match from the
# current position only.
next if $match.from;
$match := ~$match;
$len := nqp::chars( $match );
}
else {
# The pattern is a string.
my str $topic_str = $topic.Str;
$len := nqp::chars( $topic_str );
$match := $len < 1
|| ($i ?? nqp::lc(nqp::substr($tgt, $pos, $len)) eq nqp::lc($topic_str)
!! nqp::eqat($tgt, $topic_str, $pos));
}
if $match && $len > $maxlen && $pos + $len <= $eos {
$maxlen := $len;
last if $s; # stop here for sequential alternation
}
}
$cur.'!cursor_pass'($pos + $maxlen, '') if $maxlen >= 0;
$cur
}
else {
self."!cursor_start_cur"()
}
}
method DYNQUANT_LIMITS($mm) {
if nqp::istype($mm,Range) {
die 'Range minimum in quantifier (**) cannot be +Inf' if $mm.min == Inf;
die 'Range maximum in quantifier (**) cannot be -Inf' if $mm.max == -Inf;
nqp::list_i($mm.min < 0 ?? 0 !! $mm.min.Int, $mm.max == Inf ?? -1 !! $mm.max.Int)
}
else {
fail 'Fixed quantifier cannot be infinite' if $mm == -Inf || $mm == Inf;
nqp::list_i($mm.Int, $mm.Int)
}
}
method OTHERGRAMMAR($grammar, $name, |) {
my $lang_cursor := $grammar.'!cursor_init'(self.target(), :p(self.pos()));
$lang_cursor."$name"();
}
method INDRULE($rule, |c) {
$rule(self, |c)
}
method RECURSE() {
nqp::getlexdyn('$?REGEX')(self)
}
}
sub MAKE_REGEX($arg, :$i) {
my role CachedCompiledRegex {
has $.regex;
}
if nqp::istype($arg,Regex) {
$arg
}
elsif nqp::istype($arg, CachedCompiledRegex) {
$arg.regex
}
else {
my Mu $chars := nqp::split('', $arg);
my $k := 0;
my $iter := nqp::iterator($chars);
while $iter {
my $ord := nqp::ord( nqp::shift($iter) );
nqp::bindpos($chars, $k, "\\c[$ord]") if $ord <= 32;
$k := $k + 1;
}
my $arg2 := nqp::join('', $chars);
my $rx := $i ?? EVAL("anon regex \{ :i ^$arg2\}") !! EVAL("anon regex \{ ^$arg2\}");
$arg does CachedCompiledRegex($rx);
$rx
}
}
# vim: ft=perl6 expandtab sw=4