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Grammar.nqp
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Grammar.nqp
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use NQPP6QRegex;
use NQPP5QRegex;
use Raku::Actions;
my role startstops[$start, $stop1, $stop2] {
token starter { $start }
token stopper { $stop1 | $stop2 }
}
my role startstop[$start, $stop] {
token starter { $start }
token stopper { $stop }
}
my role stop[$stop] {
token starter { <!> }
token stopper { $stop }
}
role Raku::Common {
## Quote parsing
token opener {
<[
\x0028 \x003C \x005B \x007B \x00AB \x0F3A \x0F3C \x169B \x2018 \x201A \x201B
\x201C \x201E \x201F \x2039 \x2045 \x207D \x208D \x2208 \x2209 \x220A \x2215
\x223C \x2243 \x2252 \x2254 \x2264 \x2266 \x2268 \x226A \x226E \x2270 \x2272
\x2274 \x2276 \x2278 \x227A \x227C \x227E \x2280 \x2282 \x2284 \x2286 \x2288
\x228A \x228F \x2291 \x2298 \x22A2 \x22A6 \x22A8 \x22A9 \x22AB \x22B0 \x22B2
\x22B4 \x22B6 \x22C9 \x22CB \x22D0 \x22D6 \x22D8 \x22DA \x22DC \x22DE \x22E0
\x22E2 \x22E4 \x22E6 \x22E8 \x22EA \x22EC \x22F0 \x22F2 \x22F3 \x22F4 \x22F6
\x22F7 \x2308 \x230A \x2329 \x23B4 \x2768 \x276A \x276C \x276E \x2770 \x2772
\x2774 \x27C3 \x27C5 \x27D5 \x27DD \x27E2 \x27E4 \x27E6 \x27E8 \x27EA \x2983
\x2985 \x2987 \x2989 \x298B \x298D \x298F \x2991 \x2993 \x2995 \x2997 \x29C0
\x29C4 \x29CF \x29D1 \x29D4 \x29D8 \x29DA \x29F8 \x29FC \x2A2B \x2A2D \x2A34
\x2A3C \x2A64 \x2A79 \x2A7D \x2A7F \x2A81 \x2A83 \x2A8B \x2A91 \x2A93 \x2A95
\x2A97 \x2A99 \x2A9B \x2AA1 \x2AA6 \x2AA8 \x2AAA \x2AAC \x2AAF \x2AB3 \x2ABB
\x2ABD \x2ABF \x2AC1 \x2AC3 \x2AC5 \x2ACD \x2ACF \x2AD1 \x2AD3 \x2AD5 \x2AEC
\x2AF7 \x2AF9 \x2E02 \x2E04 \x2E09 \x2E0C \x2E1C \x2E20 \x2E28 \x3008 \x300A
\x300C \x300E \x3010 \x3014 \x3016 \x3018 \x301A \x301D \xFD3E \xFE17 \xFE35
\xFE37 \xFE39 \xFE3B \xFE3D \xFE3F \xFE41 \xFE43 \xFE47 \xFE59 \xFE5B \xFE5D
\xFF08 \xFF1C \xFF3B \xFF5B \xFF5F \xFF62
]>
}
method balanced($start, $stop) {
if nqp::istype($stop, VMArray) {
self.HOW.mixin(self, startstops.HOW.curry(startstops, $start, $stop[0], $stop[1]));
}
else {
self.HOW.mixin(self, startstop.HOW.curry(startstop, $start, $stop));
}
}
method unbalanced($stop) {
self.HOW.mixin(self, stop.HOW.curry(stop, $stop));
}
token starter { <!> }
token stopper { <!> }
method quote_lang($l, $start, $stop, @base_tweaks?, @extra_tweaks?) {
sub lang_key() {
my $stopstr := nqp::istype($stop,VMArray) ?? nqp::join(' ',$stop) !! $stop;
my @keybits := [
self.HOW.name(self), $l.HOW.name($l), $start, $stopstr
];
for @base_tweaks {
@keybits.push($_);
}
for @extra_tweaks {
if $_[0] eq 'to' {
return 'NOCACHE';
}
@keybits.push($_[0] ~ '=' ~ $_[1]);
}
nqp::join("\0", @keybits)
}
sub con_lang() {
my $lang := $l.'!cursor_init'(self.orig(), :p(self.pos()), :shared(self.'!shared'()));
$lang.clone_braid_from(self);
for @base_tweaks {
$lang := $lang."tweak_$_"(1);
}
for @extra_tweaks {
my $t := $_[0];
if nqp::can($lang, "tweak_$t") {
$lang := $lang."tweak_$t"($_[1]);
}
else {
self.sorry("Unrecognized adverb: :$t");
}
}
for self.slangs {
if nqp::istype($lang, $_.value) {
$lang.set_actions(self.slang_actions($_.key));
last;
}
}
$lang.set_pragma("STOPPER",$stop);
nqp::istype($stop,VMArray) ||
$start ne $stop ?? $lang.balanced($start, $stop)
!! $lang.unbalanced($stop);
}
# Get language from cache or derive it.
my $key := lang_key();
my %quote_lang_cache := %*QUOTE_LANGS;
my $quote_lang := nqp::existskey(%quote_lang_cache, $key) && $key ne 'NOCACHE'
?? %quote_lang_cache{$key}
!! (%quote_lang_cache{$key} := con_lang());
$quote_lang.set_package(self.package);
$quote_lang;
}
# Note, $lang must carry its own actions by the time we call this.
method nibble($lang) {
$lang.'!cursor_init'(self.orig(), :p(self.pos()), :shared(self.'!shared'())).nibbler().set_braid_from(self)
}
method fail-terminator ($/, $start, $stop, $line?) {
my $message;
if $start ne nqp::chr(nqp::ord($start)) {
$message := "Starter $start is immediately followed by a combining codepoint. Please use {nqp::chr(nqp::ord($start))} without a combining glyph";
if $line {
$message := "$message ($start was at line $line)";
}
}
else {
$message := "Couldn't find terminator $stop";
if $line {
$message := "$message (corresponding $start was at line $line)";
}
}
$/.typed_panic('X::Comp::AdHoc',
payload => $message,
expected => [$stop]
);
}
my class Herestub {
has $!delim;
has $!orignode;
has $!grammar;
method delim() { $!delim }
method orignode() { $!orignode }
method grammar() { $!grammar }
}
role herestop {
token starter { <!> }
token stopper { ^^ {} $<ws>=(\h*) $*DELIM \h* $$ [\r\n | \v]? }
method parsing_heredoc() { 1 }
}
method heredoc () {
my $actions := self.actions;
if $*CU && my @herestub_queue := $*CU.herestub-queue {
my $here := self.'!cursor_start_cur'();
$here.'!cursor_pos'(self.pos);
while @herestub_queue {
my $herestub := nqp::shift(@herestub_queue);
my $*DELIM := $herestub.delim;
my $lang := $herestub.grammar.HOW.mixin($herestub.grammar, herestop);
for self.slangs {
if nqp::istype($lang, $_.value) {
$lang.set_actions(self.slang_actions($_.key));
last;
}
}
my $doc := $here.nibble($lang);
if $doc {
# Match stopper.
my $stop := $lang.'!cursor_init'(self.orig(), :p($doc.pos), :shared(self.'!shared'())).stopper();
$stop.clone_braid_from(self);
unless $stop {
self.panic("Ending delimiter $*DELIM not found");
}
$here.'!cursor_pos'($stop.pos);
# Get it trimmed and AST updated.
my $heredoc := $herestub.orignode.MATCH.ast;
$heredoc.replace-segments-from($doc.MATCH.ast);
$heredoc.steal-processors-from($doc.MATCH.ast);
$heredoc.set-stop(~$stop);
my str $ws := $stop.MATCH<ws>.Str;
my int $actualchars := nqp::chars($ws);
my int $indent := $actualchars;
my int $tabstop := $*R.resolve-lexical('$?TABSTOP').compile-time-value;
my int $checkidx := -1;
while ++$checkidx < $actualchars {
if nqp::eqat($ws, "\t", $checkidx) {
$indent := $indent + ($tabstop - 1);
}
}
$heredoc.set-indent($indent);
$heredoc.trim();
}
else {
self.panic("Ending delimiter $*DELIM not found");
}
}
$here.'!cursor_pass'($here.pos);
$here.set_actions($actions);
$here
}
else {
self
}
}
token cheat_heredoc {
:my $scope;
<?{ nqp::elems($*CU.herestub-queue) }> \h* <[ ; } ]> \h* <?before \n | '#'> { $scope := $*R.current-scope; $*R.leave-scope; } <.ws> { $*R.enter-scope($scope) } <?MARKER('endstmt')>
}
token quibble($l, *@base_tweaks) {
:my $lang;
:my $start;
:my $stop;
<babble($l, @base_tweaks)>
{ my $B := $<babble><B>.ast; $lang := $B[0]; $start := $B[1]; $stop := $B[2]; }
$start
<nibble($lang)>
[
|| $stop
|| {
self.fail-terminator($/, $start, $stop,
HLL::Compiler.lineof($<babble><B>.orig(), $<babble><B>.from(), :cache(1)))
}
]
{
nqp::can($lang, 'herelang') && $*CU.queue-heredoc(
Herestub.new(
:delim(
$<nibble>.ast.literal-value
// $/.panic("Stopper '" ~ $<nibble> ~ "' too complex for heredoc")
),
:grammar($lang.herelang),
:orignode(self),
)
);
}
}
token babble($l, @base_tweaks?) {
:my @extra_tweaks;
[ <quotepair> <.ws>
{
my $pair := $<quotepair>[-1].ast;
my $k := $pair.key;
my $v := $pair.value;
unless nqp::can($v, 'compile-time-value') {
self.panic("Invalid adverb value for " ~ $<quotepair>[-1].Str ~ ': ' ~ $v.HOW.name($v));
}
$v := $v.compile-time-value;
nqp::push(@extra_tweaks, [$k, $v]);
}
]*
$<B>=[<?before .>]
{
# Work out the delimiters.
my $c := $/;
my @delims := $c.peek_delimiters($c.target, $c.pos);
my $start := @delims[0];
my $stop := @delims[1];
# Get the language.
my $lang := self.quote_lang($l, $start, $stop, @base_tweaks, @extra_tweaks);
$<B>.make([$lang, $start, $stop]);
}
}
token RESTRICTED {
[ <?{ $*RESTRICTED }> [ $ || <.security($*RESTRICTED)> ] ]?
<!>
}
## Error handling
method security($payload) {
self.typed_panic('X::SecurityPolicy::Eval', :$payload);
}
method malformed($what) {
self.typed_panic('X::Syntax::Malformed', :$what);
}
method missing($what) {
self.typed_panic('X::Syntax::Missing', :$what);
}
method missing_block($borg, $has_mystery) {
my $marked := self.MARKED('ws');
my $pos := $marked ?? $marked.from !! self.pos;
if $borg<block> {
self.'!clear_highwater'();
self.'!cursor_pos'($borg<block>.pos);
self.typed_sorry('X::Syntax::BlockGobbled', what => ($borg<name> // ''));
self.'!cursor_pos'($pos);
self.missing("block (apparently claimed by " ~ ($borg<name> ?? "'" ~ $borg<name> ~ "'" !! "expression") ~ ")");
} elsif $pos > 0 && nqp::eqat(self.orig(), '}', $pos - 1) {
self.missing("block (whitespace needed before curlies taken as a hash subscript?)");
} elsif $has_mystery {
self.missing("block (taken by some undeclared routine?)");
} else {
self.missing("block");
}
}
method NYI($feature) {
self.typed_panic('X::Comp::NYI', :$feature)
}
method EXPR_nonassoc($cur, $left, $right) {
self.typed_panic('X::Syntax::NonAssociative', :left(~$left), :right(~$right));
}
method EXPR_nonlistassoc($cur, $left, $right) {
self.typed_panic('X::Syntax::NonListAssociative', :left(~$left), :right(~$right));
}
method dupprefix($prefixes) {
self.typed_panic('X::Syntax::DuplicatedPrefix', :$prefixes);
}
token obsbrace { <.obs('curlies around escape argument','square brackets')> }
method panic(*@args) {
self.typed_panic('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method sorry(*@args) {
self.typed_sorry('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method worry(*@args) {
self.typed_worry('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method typed_panic($type_str, *%opts) {
$*R.panic(self.build_exception($type_str, |%opts));
}
method typed_sorry($type_str, *%opts) {
if $*SORRY_REMAINING-- {
$*R.add-sorry(self.build_exception($type_str, |%opts));
self
}
else {
self.typed_panic($type_str, |%opts)
}
}
method typed_worry($type_str, *%opts) {
$*R.add-worry(self.build_exception($type_str, |%opts));
self
}
method build_exception($type_str, *%opts) {
my $c := self;
if %opts<precursor> {
$c := self.PRECURSOR;
}
my $file := nqp::getlexdyn('$?FILES');
if nqp::isnull($file) {
$file := '<unknown file>';
}
elsif !nqp::eqat($file,'/',0) && !nqp::eqat($file,'-',0) && !nqp::eqat($file,':',1) {
$file := nqp::cwd ~ '/' ~ $file;
}
my @locprepost := self.'!locprepost'($c);
$*R.build-exception: $type_str,
line => HLL::Compiler.lineof($c.orig, $c.pos, :cache(1)),
pos => $c.pos,
pre => @locprepost[0],
post => @locprepost[1],
file => $file,
|%opts
}
method !locprepost($c) {
my $orig := $c.orig;
my $marked := $c.MARKED('ws');
my $pos := $marked && nqp::index(" }])>»", nqp::substr($orig, $c.pos, 1)) < 0
?? $marked.from
!! $c.pos;
my $prestart := $pos - 40;
$prestart := 0 if $prestart < 0;
$pos := 0 if $pos < 0; #FIXME workaround for when $pos is -3. Need to figure out how to get the real pos
my $pre := nqp::substr($orig, $prestart, $pos - $prestart);
$pre := subst($pre, /.*\n/, "", :global);
$pre := '<BOL>' if $pre eq '';
my $postchars := $pos + 40 > nqp::chars($orig) ?? nqp::chars($orig) - $pos !! 40;
my $post := nqp::substr($orig, $pos, $postchars);
$post := subst($post, /\n.*/, "", :global);
$post := '<EOL>' if $post eq '';
[$pre, $post]
}
method FAILGOAL($goal, $dba?) {
my $stopper;
unless $dba {
$dba := nqp::getcodename(nqp::callercode());
# Handle special case to conceal variable name leaked by core grammar
if ~$goal eq '$stopper ' {
my $ch := $dba ~~ /[post]?circumfix\:sym[\<|\«]\S+\s+(\S+)[\>|\»]/;
$ch := ~$ch[0];
if nqp::chars($ch) {
$stopper := "'" ~ $ch ~ "'";
}
}
}
# core grammar also has a penchant for sending us trailing .ws contents
$stopper := $stopper // $goal;
$stopper := $stopper ~~ /(.*\S)\s*/;
$stopper := ~$stopper[0];
self.typed_panic('X::Comp::FailGoal', :$dba, :goal($stopper),
:line-real(HLL::Compiler.lineof(self.orig(), self.from(),
:cache(1))));
}
# "when" arg assumes more things will become obsolete after Raku comes out...
method obs($old, $new, $when = 'in Raku', :$ism = 'p5isms') {
unless $*LANG.pragma($ism) {
self.typed_panic: 'X::Obsolete',
old => $old,
replacement => $new,
when => $when;
}
self;
}
method obsvar($name, $identifier-name?) {
unless $*LANG.pragma('p5isms') {
self.typed_panic: 'X::Syntax::Perl5Var',
:$name, :$identifier-name;
}
self;
}
method sorryobs($old, $new, $when = 'in Raku') {
unless $*LANG.pragma('p5isms') {
self.typed_sorry: 'X::Obsolete',
old => $old,
replacement => $new,
when => $when;
}
self;
}
method worryobs($old, $new, $when = 'in Raku') {
unless $*LANG.pragma('p5isms') {
self.typed_worry: 'X::Obsolete',
old => $old,
replacement => $new,
when => $when;
}
self;
}
method check_variable($var) {
my $ast := $var.ast;
if nqp::eqaddr($ast.WHAT,self.actions.r('Var', 'Lexical').WHAT) {
$ast.ensure-parse-performed($*R, $*CU.context);
unless $ast.is-resolved {
if $ast.sigil eq '&' {
if $ast.IMPL-IS-META-OP {
my $cat := $ast.desigilname.canonicalize(:colonpairs(0));
my $op := $ast.desigilname.colonpairs[0].literal-value;
return self if $op eq '!=' || $op eq '≠';
my $lang := self.'!cursor_init'($op, :p(0), :actions(self.actions));
$lang.clone_braid_from(self);
my $meth := $cat eq 'infix' || $cat eq 'prefix' || $cat eq 'postfix' ?? $cat ~ 'ish' !! $cat;
$meth := 'term:sym<reduce>' if $cat eq 'prefix' && $op ~~ /^ \[ .* \] $ /;
my $cursor := $lang."$meth"();
my $match := $cursor.MATCH;
if $cursor.pos == nqp::chars($op) && (
$match<infix_prefix_meta_operator> ||
$match<infix_circumfix_meta_operator> ||
$match<infix_postfix_meta_operator> ||
$match<prefix_postfix_meta_operator> ||
$match<postfix_prefix_meta_operator> ||
$match<op>)
{
my $META := $match.ast;
$META.IMPL-CHECK($*R, $*CU.context, 1);
my $meta-op := $META.IMPL-HOP-INFIX;
$ast.set-resolution(self.actions.r('Declaration', 'External', 'Constant').new(
:lexical-name($ast.name),
:compile-time-value($meta-op),
));
}
}
}
else {
self.typed_panic('X::Undeclared',
symbol => $ast.name, is-compile-time => 1
)
}
}
}
}
# Provide parent's rule/token @*ORIGIN-NESTINGS to ease and unify creating a stack of key AST nodes.
method PARENT-NESTINGS() {
# Expect to be called immediately from the nesting token.
my $parent-ctx := nqp::ctxcallerskipthunks(nqp::ctxcaller(nqp::ctx()));
nqp::getlexreldyn($parent-ctx, '@*ORIGIN-NESTINGS');
}
method key-origin($subrule, *@pos, *%named) {
my @*PARENT-NESTINGS := self.PARENT-NESTINGS();
my @*ORIGIN-NESTINGS := [];
my $rc := self."$subrule"(|@pos, |%named);
if $rc {
self.actions().key-origin($rc);
}
$rc
}
}
grammar Raku::Grammar is HLL::Grammar does Raku::Common {
##
## Compilation unit, language version and other entry point bits
##
method TOP() {
# Set up the language braid.
my $*LANG := self;
my $*MAIN := 'MAIN';
self.define_slang('MAIN', self.WHAT, self.actions);
self.define_slang('Quote', Raku::QGrammar, Raku::QActions);
self.define_slang('Regex', Raku::RegexGrammar, Raku::RegexActions);
self.define_slang('P5Regex', Raku::P5RegexGrammar, Raku::P5RegexActions);
# we default to strict!
self.set_pragma('strict',1);
# Variables used during the parse.
my $*IN_DECL; # what declaration we're in
my $*OFTYPE; # type of the current declarator
my $*LEFTSIGIL; # sigil of LHS for item vs list assignment
my $*IN_META := ''; # parsing a metaoperator like [..]
my $*IN_REDUCE := 0; # attempting to parse an [op] construct
my %*QUOTE_LANGS; # quote language cache
my $*LASTQUOTE := [0,0]; # for runaway quote detection
my $*SORRY_REMAINING := 10; # decremented on each sorry; panic when 0
my $*BORG := {}; # who gets blamed for a missing block
my $*ORIGIN-SOURCE; # where we get source code information from
my @*ORIGIN-NESTINGS := []; # this will be used for the CompUnit object
my $*COMPILING_CORE_SETTING := 0;
# This contains the given options, from the command line if invoked
# from there, otherwise from EVAL invocations.
my %*OPTIONS := %*COMPILING<%?OPTIONS>;
# This contains the current index to determine the order in which
# legacy $=pod is being filled by ::Doc::Block and ::Doc::Declarator
# blocks. Whenever a new object of these is made, the value of
# this dynamic variable will be stored in the object, and then
# incremented. At CHECK time, the generated Pod:: objects will
# be bound to the index given at creation time.
my $*LEGACY-POD-INDEX := 0;
# $/.from locations of declarator doc and rakudo blocks that have
# been seen and handled before. Needed because the grammar can
# actually visit the same piece of the code more than once.
my $*FROM-SEEN := {};
# Set to True if parsing inside a DOC-BLOCK, to prevent attaching
# of doc blocks to statements that will not actually be CHECKed
my $*PARSING-DOC-BLOCK;
# RakuDoc blocks collected so far, to be included with next statement
# into its statement list.
my $*DOC-BLOCKS-COLLECTED := [];
# Any resolver that exists outside this grammar: usually this is the
# resolver that is active whenever code is being EVALled inside BEGIN
# block, which would create a new resolver and put it in $*R.
my $*OUTER-RESOLVER := $*R;
# Parse a compilation unit.
self.comp_unit($*CU)
}
token comp_unit_stage0 { <?> }
token comp_unit($outer-cu) {
<.bom>?
# Set up compilation unit and symbol resolver according to the language
# version that is declared, if any.
:my $*CU;
:my $*R;
:my $*LITERALS;
:my $*EXPORT;
:my $*IN-TYPENAME;
:my @*LEADING-DOC := []; # temp storage leading declarator doc
:my $*DECLARAND; # target for trailing declarator doc
:my $*DECLARAND-LINE; # line at which declarand started
:my $*IGNORE-NEXT-DECLARAND; # True if next declarand to be ignored
:my $*DECLARAND-WORRIES := {}; # $/ of worries when clearing DECLARAND
:my $*NEXT_STATEMENT_ID := 1; # to give each statement an ID
:my $*FAKE_INFIX_FOUND := 0;
:my $*begin_compunit := 1; # whether we're at start of a compilation unit
<.comp_unit_stage0>
<.lang_setup($outer-cu)>
{ $*R.enter-scope($*CU); $*R.create-scope-implicits(); }
<load_command_line_modules>
<statementlist=.key-origin('FOREIGN_LANG', $*MAIN, 'statementlist')>
[ $ || <.typed_panic: 'X::Syntax::Confused'> ]
{ $*R.leave-scope() }
}
token bom { \xFEFF }
rule lang_setup($*outer-cu) {
# TODO validate this and pay attention to it in actions
[ <.ws>? 'use' <version> ';'? ]?
}
rule load_command_line_modules {
<?>
}
# This is like HLL::Grammar.LANG but it allows to call a token of a Raku level grammar.
method FOREIGN_LANG($langname, $regex) {
my $grammar := self.slang_grammar($langname);
if nqp::istype($grammar, NQPMatch) {
self.LANG($langname, $regex);
}
else {
nqp::die('FOREIGN_LANG non-NQP branch NYI')
}
}
##
## Statements
##
rule statementlist {
:dba('statement list')
<.ws>
# Define this scope to be a new language.
:my $*LANG;
<!!{ $*LANG := $/.clone_braid_from(self); 1 }>
[
| $
| <?before <.[\)\]\}]>>
| [ <statement=.key-origin('statement')> <.eat_terminator> ]*
]
<.set_braid_from(self)> # any language tweaks must not escape
<!!{ nqp::rebless($/, self.WHAT); 1 }>
}
rule semilist {
:dba('list composer')
''
[
| <?before <.[)\]}]> >
| [<statement><.eat_terminator> ]*
]
}
rule sequence {
:dba('sequence of statements')
''
[
| <?before <.[)\]}]> >
| [<statement><.eat_terminator> ]*
]
}
token statement {
:my $*QSIGIL := '';
:my $*SCOPE := '';
:my $*STATEMENT_ID := $*NEXT_STATEMENT_ID++;
:my $actions := self.slang_actions('MAIN');
<!!{ $/.set_actions($actions); 1 }>
<!before <.[\])}]> | $ >
#<!stopper>
<!!{ nqp::rebless($/, self.slang_grammar('MAIN')); 1 }>
[
| <label> <statement>
| <statement_control>
| <EXPR> :dba('statement end')
[
|| <?MARKED('endstmt')>
|| :dba('statement modifier') <.ws> <statement_mod_cond> <statement_mod_loop>?
|| :dba('statement modifier loop') <.ws> <statement_mod_loop>
{
my $sp := $<EXPR><statement_prefix>;
if $sp && $sp<sym> eq 'do' {
my $s := $<statement_mod_loop><sym>;
$/.obs("do..." ~ $s, "repeat...while or repeat...until")
unless $*LANG.pragma('p5isms');
}
}
]?
| <?[;]>
#| <?stopper>
| {} <.panic: "Bogus statement">
]
}
token label {
<identifier> ':' <?[\s]> <.ws>
}
token eat_terminator {
|| ';'
|| <?MARKED('endstmt')> <.ws>
|| <?before ')' | ']' | '}' >
|| $
|| <?stopper>
|| <?before [if|while|for|loop|repeat|given|when] » > { $/.'!clear_highwater'(); self.typed_panic( 'X::Syntax::Confused', reason => "Missing semicolon" ) }
|| { $/.typed_panic( 'X::Syntax::Confused', reason => "Confused" ) }
}
token pblock {
:dba('block or pointy block')
:my $borg := $*BORG;
:my $has_mystery := 0; # TODO
{ $*BORG := {} }
:my $*BLOCK;
[
| <lambda>
:my $*GOAL := '{';
<.enter-block-scope('PointyBlock')>
<signature>
<blockoid>
<.leave-block-scope>
| <?[{]>
<.enter-block-scope('Block')>
<blockoid>
<.leave-block-scope>
|| <.missing_block($borg, $has_mystery)>
]
}
token block {
:dba('scoped block')
:my $borg := $*BORG;
:my $has_mystery := 0; # TODO
{ $*BORG := {} }
:my $*BLOCK;
[
|| <?[{]>
<.enter-block-scope('Block')>
<blockoid>
<.leave-block-scope>
|| <.missing_block($borg, $has_mystery)>
]
}
token blockoid {
:my $borg := $*BORG;
:my $has_mystery := 0; # TODO
:my $*MULTINESS := '';
:my @*PARENT-NESTINGS := self.PARENT-NESTINGS();
:my @*ORIGIN-NESTINGS := [];
{ $*BORG := {} }
[
| '{YOU_ARE_HERE}' <you_are_here>
| :dba('block')
'{'
<statementlist=.key-origin('statementlist')>
[<.cheat_heredoc> || '}']
<?ENDSTMT>
|| <.missing_block($borg, $has_mystery)>
]
}
token unit-block($decl) {
:my $*BLOCK;
{
unless $*SCOPE eq 'unit' {
$/.panic("Semicolon form of '$decl' without 'unit' is illegal. You probably want to use 'unit $decl'");
}
}
{ $*IN_DECL := ''; }
<.enter-block-scope('Block')>
<statementlist=.key-origin('statementlist')>
<.leave-block-scope>
}
token enter-block-scope($*SCOPE-KIND) { <?> }
token leave-block-scope() { <?> }
proto rule statement_control {*}
rule statement_control:sym<if> {
$<sym>=[if|with]<.kok> {}
:my $*GOAL := '{';
:my $*BORG := {};
<condition=.EXPR>
<then=.pblock>
[
[
| 'else'\h*'if' <.typed_panic: 'X::Syntax::Malformed::Elsif'>
| 'elif' { $/.typed_panic('X::Syntax::Malformed::Elsif', what => "elif") }
| $<sym>='elsif' <condition=.EXPR> <then=.pblock>
| $<sym>='orwith' <condition=.EXPR> <then=.pblock>
]
]*
{}
[
'else'
<else=.pblock>
]?
}
rule statement_control:sym<unless> {
$<sym>='unless'<.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
[ <!before [els[e|if]|orwith]» >
|| $<wrong-keyword>=[els[e|if]|orwith]» {}
<.typed_panic: 'X::Syntax::UnlessElse',
keyword => ~$<wrong-keyword>,
>
]
}
rule statement_control:sym<without> {
$<sym>='without'<.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
[ <!before [els[e|if]|orwith]» >
|| $<wrong-keyword>=[els[e|if]|orwith]» {}
<.typed_panic: 'X::Syntax::WithoutElse',
keyword => ~$<wrong-keyword>,
>
]
}
rule statement_control:sym<while> {
$<sym>=[while|until]<.kok> {}
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
}
rule statement_control:sym<repeat> {
<sym><.kok> {}
[
| $<wu>=[while|until]<.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
| <pblock>
[$<wu>=['while'|'until']<.kok> || <.missing('"while" or "until"')>]
<EXPR>
]
}
token statement_control:sym<loop> {
<sym><.kok>
:s''
[
:my $exprs := 0;
'('
[ <e1=.EXPR>? {$exprs := 1 if $<e1>}
[ ';' <e2=.EXPR>? {$exprs := 2}
[ ';' <e3=.EXPR>? {$exprs := 3}
]? ]? ]? # succeed anyway, this will leave us with a nice cursor
[
|| <?{ $exprs == 3 }> ')'
|| <?before ')'>
[
|| <?{ $exprs == 0 }>
<.malformed("loop spec (expected 3 semicolon-separated expressions)")>
|| <.malformed("loop spec (expected 3 semicolon-separated expressions but got {$exprs})")>
]
|| <?before ‘;’>
<.malformed('loop spec (expected 3 semicolon-separated expressions but got more)')>
|| <.malformed('loop spec')>
]
]?
<block>
}
rule statement_control:sym<for> {
<sym><.kok> {}
[ <?before 'my'? '$'\w+\s+'(' >
<.typed_panic: 'X::Syntax::P5'> ]?
[ <?before '(' <.EXPR>? ';' <.EXPR>? ';' <.EXPR>? ')' >
<.obs('C-style "for (;;)" loop', '"loop (;;)"')> ]?
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
}
rule statement_control:sym<foreach> {
<sym><.end_keyword> <.obs("'foreach'", "'for'")>
}
rule statement_control:sym<given> {
<sym><.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
}
rule statement_control:sym<when> {
<sym><.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
}
rule statement_control:sym<default> {
<sym><.kok> <block>
}
rule statement_control:sym<CATCH> { <sym> <block> }
rule statement_control:sym<CONTROL> { <sym> <block> }
token statement_control:sym<no> {
<sym> <.ws>
<module_name=.longname> [ <.spacey> <arglist> ]?
<.ws>
}
token statement_control:sym<use> {
# TODO this is massively simplified
<sym> <.ws>
[
| <version>
{ $/.typed_panic: 'X::Language::TooLate', version => ~$<version> }
| <module_name=.longname> [ <.spacey> <arglist> <.cheat_heredoc>? ]?
]
<.ws>
}
rule statement_control:sym<need> {
<sym>
[
| <version> <.sorry('In case of using pragma, use "use" instead (e.g., "use v6;", "use v6.c;").')>
| <module_name=.longname>
]+ % ','
}
token statement_control:sym<import> {
:my $*IN_DECL := 'import';
<sym> <.ws>
<module_name=.longname> [ <.spacey> <arglist> ]?
<.ws>
}
rule statement_control:sym<require> {
<sym>
[
| <module_name=.longname>
| <file=.variable>
| <!sigil> <file=.term>
]
<EXPR>?
}
##
## Statement modifiers
##
method nomodexpr($k) {
self.'!clear_highwater'();
self.typed_panic( 'X::Syntax::Confused', reason => "Missing expression for '$k' statement modifier" );
self
}
token modifier_expr($k) { <EXPR> || <.nomodexpr($k)> }
proto rule statement_mod_cond {*}
rule statement_mod_cond:sym<if> { <sym><.kok> <modifier_expr('if')> }
rule statement_mod_cond:sym<unless> { <sym><.kok> <modifier_expr('unless')> }
rule statement_mod_cond:sym<when> { <sym><.kok> <modifier_expr('when')> }
rule statement_mod_cond:sym<with> { <sym><.kok> <modifier_expr('with')> }
rule statement_mod_cond:sym<without> { <sym><.kok> <modifier_expr('without')> }
proto rule statement_mod_loop {*}
rule statement_mod_loop:sym<while> { <sym><.kok> <modifier_expr('while')> }
rule statement_mod_loop:sym<until> { <sym><.kok> <modifier_expr('until')> }
rule statement_mod_loop:sym<given> { <sym><.kok> <modifier_expr('given')> }
rule statement_mod_loop:sym<for> { <sym><.kok> <modifier_expr('for')> }
##
## Statement prefixes