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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);
$heredoc.set-indent($actualchars);
$heredoc.trim;
}
else {
self.panic("Ending delimiter $*DELIM not found");
}
}
$here.'!cursor_pass'($here.pos);
$here.set_actions($actions);
$here
}
else {
self
}
}
token quibble($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 := $marked && nqp::index(" }])>Β»", nqp::substr($orig, $c.pos, 1)) < 0
?? $marked.from
!! $c.pos;
my $prestart := $pos - 40;
$prestart := 0 if $prestart < 0;
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[\<|\Β«]\S+\s+(\S+)[\>|\Β»]/;
$ch := ~$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 $ast ~~ self.actions.r('Var', 'Lexical') {
$ast.resolve-with($*R);
unless $ast.is-resolved || $ast.sigil eq '&' {
my str $name := $var.ast.name;
$*LANG.pragma("strict")
?? self.typed_panic('X::Undeclared',
symbol => $name, is-compile-time => 1
)
!! RakuAST::VarDeclaration::Simple.new(
scope => 'our', name => $name
).resolve-with($*R)
}
}
}
# 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);
#self.define_slang('Pod', Raku::PodGrammar, Raku::PodActions);
# 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;
# Variables used for Pod parsing.
my $*VMARGIN := 0;
my $*ALLOW_INLINE_CODE := 0;
my $*POD_IN_CODE_BLOCK := 0;
my $*POD_IN_FORMATTINGCODE := 0;
my $*POD_ALLOW_FCODES := 0b11111111111111111111111111;
my $*POD_ANGLE_COUNT := 0;
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 $*NEXT_STATEMENT_ID := 1; # to give each statement an ID
: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] Β» > { $/.'!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 := [];
{ $*BORG := {} }
[
| '{YOU_ARE_HERE}' <you_are_here>
| :dba('block')
'{'
<statementlist=.key-origin('statementlist')>
'}'
<?ENDSTMT>
|| <.missing_block($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]Β» >
|| $<wrong-keyword>=[els[e|if]|orwith]Β» {}
<.typed_panic: 'X::Syntax::UnlessElse',
keyword => ~$<wrong-keyword>,
>
]
}
rule statement_control:sym<without> {
$<sym>='without'<.kok>
:my $*GOAL := '{';
:my $*BORG := {};
<EXPR>
<pblock>
[ <!before [els[e|if]|orwith]Β» >
|| $<wrong-keyword>=[els[e|if]|orwith]Β» {}
<.typed_panic: 'X::Syntax::WithoutElse',
keyword => ~$<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 β;β>
<.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<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> ]?
]
<.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
##
proto token statement_prefix { <...> }
token statement_prefix:sym<BEGIN> { <sym><.kok> <blorst> }
token statement_prefix:sym<INIT> { <sym><.kok> <blorst> }
token statement_prefix:sym<END> { <sym><.kok> <blorst> }
token statement_prefix:sym<ENTER> { <sym><.kok> <blorst> }
token statement_prefix:sym<LEAVE> { <sym><.kok> <blorst> }
token statement_prefix:sym<KEEP> { <sym><.kok> <blorst> }
token statement_prefix:sym<UNDO> { <sym><.kok> <blorst> }
token statement_prefix:sym<FIRST> { <sym><.kok> <blorst> }
token statement_prefix:sym<NEXT> { <sym><.kok> <blorst> }
token statement_prefix:sym<LAST> { <sym><.kok> <blorst> }
token statement_prefix:sym<PRE> { <sym><.kok> <blorst> }
token statement_prefix:sym<POST> { <sym><.kok> <blorst> }
token statement_prefix:sym<QUIT> { <sym><.kok> <blorst> }
token statement_prefix:sym<CLOSE> { <sym><.kok> <blorst> }
token statement_prefix:sym<race> { <sym><.kok> <blorst> }
token statement_prefix:sym<hyper> { <sym><.kok> <blorst> }
token statement_prefix:sym<lazy> { <sym><.kok> <blorst> }
token statement_prefix:sym<eager> { <sym><.kok> <blorst> }
token statement_prefix:sym<try> { <sym><.kok> <blorst> }
token statement_prefix:sym<do> { <sym><.kok> <blorst> }
token statement_prefix:sym<quietly> { <sym><.kok> <blorst> }
token statement_prefix:sym<gather> { <sym><.kok> <blorst> }
token statement_prefix:sym<start> { <sym><.kok> <blorst> }
token blorst {
[
| <?[{]> <block>
| <![;]> <statement> # <.cheat_heredoc>?
|| <.missing: 'block or statement'>
]
}
##
## Expression parsing and operators
##
# Precedence levels and their defaults
my %methodcall := nqp::hash('prec', 'y=', 'assoc', 'unary', 'dba', 'methodcall', 'fiddly', 1);
my %autoincrement := nqp::hash('prec', 'x=', 'assoc', 'unary', 'dba', 'autoincrement');
my %exponentiation := nqp::hash('prec', 'w=', 'assoc', 'right', 'dba', 'exponentiation');
my %symbolic_unary := nqp::hash('prec', 'v=', 'assoc', 'unary', 'dba', 'symbolic unary');
my %dottyinfix := nqp::hash('prec', 'v=', 'assoc', 'left', 'dba', 'dotty infix', 'nextterm', 'dottyopish', 'sub', 'z=', 'fiddly', 1);
my %multiplicative := nqp::hash('prec', 'u=', 'assoc', 'left', 'dba', 'multiplicative');
my %additive := nqp::hash('prec', 't=', 'assoc', 'left', 'dba', 'additive');
my %replication := nqp::hash('prec', 's=', 'assoc', 'left', 'dba', 'replication');
my %replication_xx := nqp::hash('prec', 's=', 'assoc', 'left', 'dba', 'replication', 'thunky', 't.');
my %concatenation := nqp::hash('prec', 'r=', 'assoc', 'left', 'dba', 'concatenation');
my %junctive_and := nqp::hash('prec', 'q=', 'assoc', 'list', 'dba', 'junctive and');
my %junctive_or := nqp::hash('prec', 'p=', 'assoc', 'list', 'dba', 'junctive or');
my %named_unary := nqp::hash('prec', 'o=', 'assoc', 'unary', 'dba', 'named unary');
my %structural := nqp::hash('prec', 'n=', 'assoc', 'non', 'dba', 'structural infix', 'diffy', 1);
my %chaining := nqp::hash('prec', 'm=', 'assoc', 'chain', 'dba', 'chaining', 'iffy', 1, 'diffy', 1);
my %tight_and := nqp::hash('prec', 'l=', 'assoc', 'left', 'dba', 'tight and', 'thunky', '.t');
my %tight_or := nqp::hash('prec', 'k=', 'assoc', 'list', 'dba', 'tight or', 'thunky', '.t');
my %tight_or_minmax := nqp::hash('prec', 'k=', 'assoc', 'list', 'dba', 'tight or');
my %conditional := nqp::hash('prec', 'j=', 'assoc', 'right', 'dba', 'conditional', 'fiddly', 1, 'thunky', '.tt');
my %conditional_ff := nqp::hash('prec', 'j=', 'assoc', 'right', 'dba', 'conditional', 'fiddly', 1, 'thunky', 'tt');
my %item_assignment := nqp::hash('prec', 'i=', 'assoc', 'right', 'dba', 'item assignment');
my %list_assignment := nqp::hash('prec', 'i=', 'assoc', 'right', 'dba', 'list assignment', 'sub', 'e=', 'fiddly', 1);
my %loose_unary := nqp::hash('prec', 'h=', 'assoc', 'unary', 'dba', 'loose unary');
my %comma := nqp::hash('prec', 'g=', 'assoc', 'list', 'dba', 'comma', 'nextterm', 'nulltermish', 'fiddly', 1);
my %list_infix := nqp::hash('prec', 'f=', 'assoc', 'list', 'dba', 'list infix');
my %list_prefix := nqp::hash('prec', 'e=', 'assoc', 'right', 'dba', 'list prefix');
my %loose_and := nqp::hash('prec', 'd=', 'assoc', 'left', 'dba', 'loose and', 'thunky', '.t');
my %loose_andthen := nqp::hash('prec', 'd=', 'assoc', 'left', 'dba', 'loose and', 'thunky', '.b');
my %loose_or := nqp::hash('prec', 'c=', 'assoc', 'list', 'dba', 'loose or', 'thunky', '.t');
my %loose_orelse := nqp::hash('prec', 'c=', 'assoc', 'list', 'dba', 'loose or', 'thunky', '.b');
my %sequencer := nqp::hash('prec', 'b=', 'assoc', 'list', 'dba', 'sequencer');
method can_meta($op, $meta, $reason = "fiddly") {
if $op<OPER> && $op<OPER><O>.made{$reason} == 1 {
self.typed_panic: "X::Syntax::CannotMeta", :$meta, operator => ~$op<OPER>, dba => ~$op<OPER><O>.made<dba>, reason => "too $reason";
}
self;
}
method EXPR(str $preclim = '') {
my $*LEFTSIGIL := '';
nqp::findmethod(HLL::Grammar, 'EXPR')(self, $preclim, :noinfix($preclim eq 'y='));