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Grammar.pm
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Grammar.pm
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use QRegex;
use NQPP6QRegex;
use NQPP5QRegex;
use Perl6::Actions;
use Perl6::World;
use Perl6::Pod;
role startstop[$start, $stop] {
token starter { $start }
token stopper { $stop }
}
role stop[$stop] {
token starter { <!> }
token stopper { $stop }
}
# This role captures things that STD factors out from any individual grammar,
# but that don't make sense to go in HLL::Grammar.
role STD {
token opener {
<[
\x0028 \x003C \x005B \x007B \x00AB \x0F3A \x0F3C \x169B \x2018 \x201A \x201B
\x201C \x201E \x201F \x2039 \x2045 \x207D \x208D \x2208 \x2209 \x220A \x2215
\x223C \x2243 \x2252 \x2254 \x2264 \x2266 \x2268 \x226A \x226E \x2270 \x2272
\x2274 \x2276 \x2278 \x227A \x227C \x227E \x2280 \x2282 \x2284 \x2286 \x2288
\x228A \x228F \x2291 \x2298 \x22A2 \x22A6 \x22A8 \x22A9 \x22AB \x22B0 \x22B2
\x22B4 \x22B6 \x22C9 \x22CB \x22D0 \x22D6 \x22D8 \x22DA \x22DC \x22DE \x22E0
\x22E2 \x22E4 \x22E6 \x22E8 \x22EA \x22EC \x22F0 \x22F2 \x22F3 \x22F4 \x22F6
\x22F7 \x2308 \x230A \x2329 \x23B4 \x2768 \x276A \x276C \x276E \x2770 \x2772
\x2774 \x27C3 \x27C5 \x27D5 \x27DD \x27E2 \x27E4 \x27E6 \x27E8 \x27EA \x2983
\x2985 \x2987 \x2989 \x298B \x298D \x298F \x2991 \x2993 \x2995 \x2997 \x29C0
\x29C4 \x29CF \x29D1 \x29D4 \x29D8 \x29DA \x29F8 \x29FC \x2A2B \x2A2D \x2A34
\x2A3C \x2A64 \x2A79 \x2A7D \x2A7F \x2A81 \x2A83 \x2A8B \x2A91 \x2A93 \x2A95
\x2A97 \x2A99 \x2A9B \x2AA1 \x2AA6 \x2AA8 \x2AAA \x2AAC \x2AAF \x2AB3 \x2ABB
\x2ABD \x2ABF \x2AC1 \x2AC3 \x2AC5 \x2ACD \x2ACF \x2AD1 \x2AD3 \x2AD5 \x2AEC
\x2AF7 \x2AF9 \x2E02 \x2E04 \x2E09 \x2E0C \x2E1C \x2E20 \x3008 \x300A \x300C
\x300E \x3010 \x3014 \x3016 \x3018 \x301A \x301D \xFD3E \xFE17 \xFE35 \xFE37
\xFE39 \xFE3B \xFE3D \xFE3F \xFE41 \xFE43 \xFE47 \xFE59 \xFE5B \xFE5D \xFF08
\xFF1C \xFF3B \xFF5B \xFF5F \xFF62
]>
}
method balanced($start, $stop) {
self.HOW.mixin(self, startstop.HOW.curry(startstop, $start, $stop));
}
method unbalanced($stop) {
self.HOW.mixin(self, stop.HOW.curry(stop, $stop));
}
token starter { <!> }
token stopper { <!> }
my %quote_lang_cache;
method quote_lang($l, $start, $stop, @base_tweaks?, @extra_tweaks?) {
sub lang_key() {
my @keybits := [$l.HOW.name($l), $start, $stop];
for @base_tweaks {
@keybits.push($_);
}
for @extra_tweaks {
if $_[0] eq 'to' {
return 'NOCACHE';
}
@keybits.push($_[0] ~ '=' ~ $_[1]);
}
nqp::join("\0", @keybits)
}
sub con_lang() {
my $lang := $l;
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");
}
}
$start ne $stop ?? $lang.balanced($start, $stop)
!! $lang.unbalanced($stop);
}
# Get language from cache or derive it.
my $key := lang_key();
nqp::ifnull(%quote_lang_cache, %quote_lang_cache := nqp::hash());
nqp::existskey(%quote_lang_cache, $key) && $key ne 'NOCACHE'
?? %quote_lang_cache{$key}
!! (%quote_lang_cache{$key} := con_lang());
}
token babble($l, @base_tweaks?) {
:my @extra_tweaks;
<.ws>
[ <quotepair> <.ws>
{
my $kv := $<quotepair>[-1].ast;
my $k := $kv.named;
if nqp::istype($kv, QAST::Stmts) || nqp::istype($kv, QAST::Stmt) && +@($kv) == 1 {
$kv := $kv[0];
}
my $v := nqp::istype($kv, QAST::IVal)
?? $kv.value
!! $kv.has_compile_time_value
?? $kv.compile_time_value
!! self.panic("Invalid adverb value for " ~ $<quotepair>[-1].Str);
nqp::push(@extra_tweaks, [$k, $v]);
}
]*
$<B>=[<?>]
{
# Work out the delimeters.
my $c := $/.CURSOR;
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]);
}
}
my @herestub_queue;
my class Herestub {
has $!delim;
has $!orignode;
has $!lang;
method delim() { $!delim }
method orignode() { $!orignode }
method lang() { $!lang }
}
role herestop {
token stopper { ^^ {} $<ws>=(\h*) $*DELIM \h* $$ \v? }
}
method heredoc () {
my $here := self.'!cursor_start'();
$here.'!cursor_pos'(self.pos);
while @herestub_queue {
my $herestub := nqp::shift(@herestub_queue);
my $*DELIM := $herestub.delim;
my $lang := $herestub.lang.HOW.mixin($herestub.lang, herestop);
my $doc := $here.nibble($lang);
if $doc {
# Match stopper.
my $stop := $lang.'!cursor_init'(self.orig(), :p($doc.pos), :shared(self.'!shared'())).stopper();
unless $stop {
self.panic("Ending delimiter $*DELIM not found");
}
$here.'!cursor_pos'($stop.pos);
# Get it trimmed and AST updated.
$*ACTIONS.trim_heredoc($doc, $stop, $herestub.orignode.MATCH.ast);
}
else {
self.panic("Ending delimiter $*DELIM not found");
}
}
$here.'!cursor_pass'($here.pos);
$here
}
method queue_heredoc($delim, $lang) {
nqp::ifnull(@herestub_queue, @herestub_queue := []);
nqp::push(@herestub_queue, Herestub.new(:$delim, :$lang, :orignode(self)));
return self;
}
token quibble($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 || { $/.CURSOR.panic("Couldn't find terminator $stop") } ]
{
nqp::can($lang, 'herelang') && self.queue_heredoc(
$*W.nibble_to_str($/, $<nibble>.ast[1], -> { "Stopper '" ~ $<nibble> ~ "' too complex for heredoc" }),
$lang.herelang)
}
}
method nibble($lang) {
my $lang_cursor := $lang.'!cursor_init'(self.orig(), :p(self.pos()), :shared(self.'!shared'()));
my $*ACTIONS;
for %*LANG {
if nqp::istype($lang, $_.value) {
$*ACTIONS := %*LANG{$_.key ~ '-actions'};
last;
}
}
$lang_cursor.nibbler();
}
method panic(*@args) {
self.typed_panic('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method sorry(*@args) {
self.typed_sorry('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method worry(*@args) {
self.typed_worry('X::Comp::AdHoc', payload => nqp::join('', @args))
}
method typed_panic($type_str, *%opts) {
$*W.throw(self.MATCH(), nqp::split('::', $type_str), |%opts);
}
method typed_sorry($type_str, *%opts) {
if +@*SORROWS + 1 == $*SORRY_LIMIT {
$*W.throw(self.MATCH(), nqp::split('::', $type_str), |%opts);
}
else {
@*SORROWS.push($*W.typed_exception(self.MATCH(), nqp::split('::', $type_str), |%opts));
}
self
}
method typed_worry($type_str, *%opts) {
@*WORRIES.push($*W.typed_exception(self.MATCH(), nqp::split('::', $type_str), |%opts));
self
}
method malformed($what) {
self.typed_panic('X::Syntax::Malformed', :$what);
}
method missing($what) {
self.typed_panic('X::Syntax::Missing', :$what);
}
method NYI($feature) {
self.typed_panic('X::Comp::NYI', :$feature)
}
method EXPR_nonassoc($cur, $left, $right) {
self.typed_panic('X::Syntax::NonAssociative', :left(~$left), :right(~$right));
}
# "when" arg assumes more things will become obsolete after Perl 6 comes out...
method obs($old, $new, $when = 'in Perl 6') {
$*W.throw(self.MATCH(), ['X', 'Obsolete'],
old => $old,
replacement => $new,
when => $when,
);
}
method sorryobs($old, $new, $when = ' in Perl 6') {
$*W.throw(self.MATCH(), ['X', 'Obsolete'],
old => $old,
replacement => $new,
when => $when,
);
}
method worryobs($old, $new, $when = ' in Perl 6') {
$*W.throw(self.MATCH(), ['X', 'Obsolete'],
old => $old,
replacement => $new,
when => $when,
);
}
method check_variable($var) {
my $varast := $var.ast;
if nqp::istype($varast, QAST::Op) && $varast.op eq 'ifnull' {
$varast := $varast[0];
}
if !$*IN_DECL && nqp::istype($varast, QAST::Var) && $varast.scope eq 'lexical' {
my $name := $varast.name;
if $name ne '%_' && $name ne '@_' && !$*W.is_lexical($name) {
if $var<sigil> ne '&' {
my @suggestions := $*W.suggest_lexicals($name);
$*W.throw($var, ['X', 'Undeclared'], symbol => $varast.name(), suggestions => @suggestions);
}
else {
$var.CURSOR.add_mystery($varast.name, $var.to, 'var');
}
}
else {
my $lex := $*W.cur_lexpad();
my %sym := $lex.symbol($name);
if %sym {
%sym<used> := 1;
}
else {
# Add mention-only record (used to poison outer
# usages and disambiguate hashes/blocks by use of
# $_ when $*IMPLICIT is in force).
$lex<also_uses> := {} unless $lex<also_uses>;
$lex<also_uses>{$name} := 1;
}
}
}
self
}
}
grammar Perl6::Grammar is HLL::Grammar does STD {
method TOP() {
# Language braid.
my %*LANG;
%*LANG<Regex> := Perl6::RegexGrammar;
%*LANG<Regex-actions> := Perl6::RegexActions;
%*LANG<P5Regex> := Perl6::P5RegexGrammar;
%*LANG<P5Regex-actions> := Perl6::P5RegexActions;
%*LANG<Q> := Perl6::QGrammar;
%*LANG<Q-actions> := Perl6::QActions;
%*LANG<MAIN> := Perl6::Grammar;
%*LANG<MAIN-actions> := Perl6::Actions;
# Package declarator to meta-package mapping. Starts pretty much empty;
# we get the mappings either imported or supplied by the setting. One
# issue is that we may have no setting to provide them, e.g. when we
# compile the setting, but it still wants some kinda package. We just
# fudge in knowhow for that.
my %*HOW;
%*HOW<knowhow> := pir::get_knowhow__P();
%*HOW<package> := pir::get_knowhow__P();
# Symbol table and serialization context builder - keeps track of
# objects that cross the compile-time/run-time boundary that are
# associated with this compilation unit.
my $file := pir::find_caller_lex__Ps('$?FILES');
my $source_id := nqp::sha1(self.target());
my $*W := nqp::isnull($file) ??
Perl6::World.new(:handle($source_id)) !!
Perl6::World.new(:handle($source_id), :description($file));
$*W.add_initializations();
# XXX Hack: clear any marks.
pir::set_hll_global__vsP('%!MARKHASH', nqp::null());
my $cursor := self.comp_unit;
$*W.pop_lexpad(); # UNIT
$*W.pop_lexpad(); # UNIT_OUTER
$cursor;
}
## Lexer stuff
token apostrophe {
<[ ' \- ]>
}
token ident {
<.alpha> \w*
}
token identifier {
<.ident> [ <.apostrophe> <.ident> ]*
}
token name {
[
| <identifier> <morename>*
| <morename>+
]
}
token morename {
:my $*QSIGIL := '';
'::'
[
|| <?before '(' | <alpha> >
[
| <identifier>
| :dba('indirect name') '(' ~ ')' <EXPR>
]
|| <?before '::'> <.typed_panic: "X::Syntax::Name::Null">
]?
}
token longname {
<name> {} [ <?before ':' <+alpha+[\< \[ \« ]>> <colonpair> ]*
}
token deflongname {
:dba('new name to be defined')
<name> <colonpair>*
}
token module_name {
<longname>
[ <?before '['> :dba('generic role') '[' ~ ']' <arglist> ]?
}
token end_keyword {
<!before <[ \( \\ ' \- ]> || \h* '=>'> »
}
token spacey { <?before [\s | '#']> }
token ENDSTMT {
[
| \h* $$ <.ws> <?MARKER('endstmt')>
| <.unv>? $$ <.ws> <?MARKER('endstmt')>
]?
}
token ws {
:my $old_highexpect := self.'!fresh_highexpect'();
:dba('whitespace')
[
|| <?MARKED('ws')>
|| <!ww>
[
| <.vws> <.heredoc>
| <.unv>
]*
<?MARKER('ws')>
]
:my $stub := self.'!set_highexpect'($old_highexpect);
}
token unsp {
\\ <?before [\s|'#'] >
:dba('unspace')
[
| <.vws>
| <.unv>
]*
}
token vws {
:dba('vertical whitespace')
[
[
| \v
| '<<<<<<<' {} <?before [.*? \v '=======']: .*? \v '>>>>>>>' > <.sorry: 'Found a version control conflict marker'> \V* \v
| '=======' {} .*? \v '>>>>>>>' \V* \v # ignore second half
]
]+
}
token unv {
:dba('horizontal whitespace')
[
| \h+
| \h* <.comment>
| <?before \h* '=' [ \w | '\\'] > ^^ <.pod_content_toplevel>
]
}
proto token comment { <...> }
token comment:sym<#> {
'#' {} \N*
}
token comment:sym<#`(...)> {
'#`' <?opener> {}
[ <.quibble(%*LANG<Q>)> || <.typed_panic: 'X::Syntax::Comment::Embedded'> ]
}
token comment:sym<#=(...)> {
'#=' <?opener> $<attachment>=<.quibble(%*LANG<Q>)>
}
token comment:sym<#=> {
'#=' \h+ $<attachment>=[\N*]
{ $*DECLARATOR_DOCS := $<attachment> }
}
token attach_docs {
{
if ~$*DOC ne '' {
my $cont := Perl6::Pod::serialize_aos(
[Perl6::Pod::formatted_text(~$*DOC)]
).compile_time_value;
my $block := $*W.add_constant(
'Pod::Block::Declarator', 'type_new',
:nocache, :content($cont),
);
$*DOCEE := $block.compile_time_value;
$*POD_BLOCKS.push($*DOCEE);
}
}
<?>
}
token pod_content_toplevel {
<pod_block>
}
proto token pod_content { <...> }
token pod_content:sym<block> {
<pod_newline>*
<pod_block>
<pod_newline>*
}
# any number of paragraphs of text
token pod_content:sym<text> {
<pod_newline>*
<pod_textcontent>+ % <pod_newline>+
<pod_newline>*
}
# not a block, just a directive
token pod_content:sym<config> {
<pod_newline>*
^^ \h* '=config' \h+ $<type>=\S+ <pod_configuration>
<pod_newline>+
}
proto token pod_textcontent { <...> }
# text not being code
token pod_textcontent:sym<regular> {
$<spaces>=[ \h* ]
<?{ !$*ALLOW_CODE
|| ($<spaces>.to - $<spaces>.from) <= $*VMARGIN }>
$<text> = [
\h* <!before '=' \w> <pod_string> <pod_newline>
] +
}
token pod_textcontent:sym<code> {
$<spaces>=[ \h* ]
<?{ $*ALLOW_CODE
&& ($<spaces>.to - $<spaces>.from) > $*VMARGIN }>
$<text> = [
[<!before '=' \w> \N+]+ % [<pod_newline> $<spaces>]
]
}
token pod_formatting_code {
$<code>=<[A..Z]>
'<' { $*POD_IN_FORMATTINGCODE := 1 }
$<content>=[ <!before '>'> <pod_string_character> ]+
'>' { $*POD_IN_FORMATTINGCODE := 0 }
}
token pod_string {
<pod_string_character>+
}
token pod_string_character {
<pod_formatting_code> || $<char>=[ \N || [
<?{ $*POD_IN_FORMATTINGCODE == 1}> \n <!before \h* '=' \w>
]
]
}
proto token pod_block { <...> }
token pod_configuration($spaces = '') {
[ [\n $spaces '=']? \h+ <colonpair> ]*
}
token pod_block:sym<delimited_raw> {
^^
$<spaces> = [ \h* ]
'=begin' \h+ $<type>=[ 'code' | 'comment' ] {}
<pod_configuration($<spaces>)> <pod_newline>+
[
$<pod_content> = [ .*? ]
^^ $<spaces> '=end' \h+ $<type> <pod_newline>
|| <.typed_panic: 'X::Syntax::Pod::BeginWithoutEnd'>
]
}
token pod_block:sym<delimited> {
^^
$<spaces> = [ \h* ]
'=begin'
[ <?before <pod_newline>>
<.typed_panic('X::Syntax::Pod::BeginWithoutIdentifier')>
]?
\h+ <!before 'END'>
{
$*VMARGIN := $<spaces>.to - $<spaces>.from;
}
:my $*ALLOW_CODE := 0;
$<type> = [
<pod_code_parent> { $*ALLOW_CODE := 1 }
|| <identifier>
]
<pod_configuration($<spaces>)> <pod_newline>+
[
<pod_content> *
^^ $<spaces> '=end' \h+ $<type> <pod_newline>
|| <.typed_panic: 'X::Syntax::Pod::BeginWithoutEnd'>
]
}
token pod_block:sym<delimited_table> {
^^
$<spaces> = [ \h* ]
'=begin' \h+ 'table'
<pod_configuration($<spaces>)> <pod_newline>+
[
<table_row>*
^^ \h* '=end' \h+ 'table' <pod_newline>
|| <.typed_panic: 'X::Syntax::Pod::BeginWithoutEnd'>
]
}
token table_row {
\h* <!before '=' \w> \N* \n
}
token pod_block:sym<end> {
^^ \h*
[
| '=begin' \h+ 'END' <pod_newline>
| '=for' \h+ 'END' <pod_newline>
| '=END' <pod_newline>
]
.*
}
token pod_block:sym<paragraph> {
^^
$<spaces> = [ \h* ]
'=for' \h+ <!before 'END'>
{
$*VMARGIN := $<spaces>.to - $<spaces>.from;
}
:my $*ALLOW_CODE := 0;
$<type> = [
<pod_code_parent> { $*ALLOW_CODE := 1 }
|| <identifier>
]
<pod_configuration($<spaces>)> <pod_newline>
$<pod_content> = <pod_textcontent>?
}
token pod_block:sym<paragraph_raw> {
^^
$<spaces> = [ \h* ]
'=for' \h+ $<type>=[ 'code' | 'comment' ]
<pod_configuration($<spaces>)> <pod_newline>
$<pod_content> = [ \h* <!before '=' \w> \N+ \n ]+
}
token pod_block:sym<paragraph_table> {
^^
$<spaces> = [ \h* ]
'=for' \h+ 'table'
<pod_configuration($<spaces>)> <pod_newline>
[ <!before \h* \n> <table_row>]*
}
token pod_block:sym<abbreviated> {
^^
$<spaces> = [ \h* ]
'=' <!before begin || end || for || END || config>
{
$*VMARGIN := $<spaces>.to - $<spaces>.from;
}
:my $*ALLOW_CODE := 0;
$<type> = [
<pod_code_parent> { $*ALLOW_CODE := 1 }
|| <identifier>
]
<pod_configuration($<spaces>)>
[\r\n|\s]
$<pod_content> = <pod_textcontent>?
}
token pod_block:sym<abbreviated_raw> {
^^
$<spaces> = [ \h* ]
'=' $<type>=[ 'code' | 'comment' ]
<pod_configuration($<spaces>)> [\r\n|\s]
$<pod_content> = [ \h* <!before '=' \w> \N+ \n ]*
}
token pod_block:sym<abbreviated_table> {
^^
$<spaces> = [ \h* ]
'=table' <pod_configuration($<spaces>)> <pod_newline>
[ <!before \h* \n> <table_row>]*
}
token pod_newline {
\h* \n
}
token pod_code_parent {
'pod' <!before \w> || 'item' \d* <!before \w>
# TODO: Also Semantic blocks one day
}
token install_doc_phaser { <?> }
token vnum {
\d+ | '*'
}
token version {
'v' <?before \d> {} $<vstr>=[<vnum>+ % '.' '+'?]
<!before '-'|\'> # cheat because of LTM fail
}
## Top-level rules
token comp_unit {
# From STD.pm.
:my $*LEFTSIGIL; # sigil of LHS for item vs list assignment
:my $*SCOPE := ''; # which scope declarator we're under
:my $*MULTINESS := ''; # which multi declarator we're under
:my $*QSIGIL := ''; # sigil of current interpolation
:my $*IN_DECL; # what declaration we're in
:my $*HAS_SELF := ''; # is 'self' available? (for $.foo style calls)
:my $*MONKEY_TYPING := 0; # whether augment/supersede are allowed
:my $*begin_compunit := 1; # whether we're at start of a compilation unit
:my $*DECLARAND; # the current thingy we're declaring, and subject of traits
:my $*METHODTYPE; # the current type of method we're in, if any
:my $*PKGDECL; # what type of package we're in, if any
:my %*MYSTERY; # names we assume may be post-declared functions
# Error related. There are three levels: worry (just a warning), sorry
# (fatal but not immediately so) and panic (immediately deadly). There
# is a limit on the number of sorrows also. Unlike STD, which emits the
# textual messages as it goes, we keep track of the exception objects
# and, if needed, make a compositite exception group.
:my @*WORRIES; # exception objects resulting from worry
:my @*SORROWS; # exception objects resulting from sorry
:my $*SORRY_LIMIT := 10; # when sorrow turns to panic
# Extras.
:my %*METAOPGEN; # hash of generated metaops
:my %*HANDLERS; # block exception handlers
:my $*IMPLICIT; # whether we allow an implicit param
:my $*FORBID_PIR := 0; # whether pir::op and Q:PIR { } are disallowed
:my $*HAS_YOU_ARE_HERE := 0; # whether {YOU_ARE_HERE} has shown up
:my $*OFTYPE;
:my $*VMARGIN := 0; # pod stuff
:my $*ALLOW_CODE := 0; # pod stuff
:my $*POD_IN_FORMATTINGCODE := 0; # pod stuff
:my $*IN_REGEX_ASSERTION := 0;
:my $*SOFT := 0; # is the soft pragma in effect
:my $*IN_PROTO := 0; # are we inside a proto?
# Various interesting scopes we'd like to keep to hand.
:my $*GLOBALish;
:my $*PACKAGE;
:my $*SETTING;
:my $*UNIT;
:my $*UNIT_OUTER;
:my $*EXPORT;
# stack of packages, which the 'is export' needs
:my @*PACKAGES := [];
# A place for Pod
:my $*POD_BLOCKS := [];
:my $*POD_BLOCKS_SEEN := {};
:my $*POD_PAST;
:my $*DECLARATOR_DOCS;
# Quasis and unquotes
:my $*IN_QUASI := 0; # whether we're currently in a quasi block
# Setting loading and symbol setup.
{
# Create unit outer (where we assemble any lexicals accumulated
# from e.g. REPL) and the real UNIT.
$*UNIT_OUTER := $*W.push_lexpad($/);
$*UNIT := $*W.push_lexpad($/);
$*UNIT<IN_DECL> := 'mainline';
# If we already have a specified outer context, then that's
# our setting. Otherwise, load one.
my $have_outer := nqp::defined(%*COMPILING<%?OPTIONS><outer_ctx>);
unless $have_outer {
$*SETTING := $*W.load_setting($/, %*COMPILING<%?OPTIONS><setting> // 'CORE');
}
$/.CURSOR.unitstart();
try {
my $EXPORTHOW := $*W.find_symbol(['EXPORTHOW']);
for $EXPORTHOW.WHO {
%*HOW{$_.key} := $_.value;
}
}
# Create GLOBAL(ish), unless we were given one.
if nqp::existskey(%*COMPILING<%?OPTIONS>, 'global') {
$*GLOBALish := %*COMPILING<%?OPTIONS><global>;
}
elsif $have_outer && $*UNIT_OUTER.symbol('GLOBALish') {
$*GLOBALish := $*UNIT_OUTER.symbol('GLOBALish')<value>;
}
else {
$*GLOBALish := $*W.pkg_create_mo($/, %*HOW<package>, :name('GLOBAL'));
$*W.pkg_compose($*GLOBALish);
}
# Create or pull in existing EXPORT.
if $have_outer && $*UNIT_OUTER.symbol('EXPORT') {
$*EXPORT := $*UNIT_OUTER.symbol('EXPORT')<value>;
}
else {
$*EXPORT := $*W.pkg_create_mo($/, %*HOW<package>, :name('EXPORT'));
$*W.pkg_compose($*EXPORT);
}
# If there's a self in scope, set $*HAS_SELF.
if $have_outer && $*UNIT_OUTER.symbol('self') {
$*HAS_SELF := 'complete';
}
# Take current package from outer context if any, otherwise for a
# fresh compilation unit we start in GLOBAL.
if $have_outer && $*UNIT_OUTER.symbol('$?PACKAGE') {
$*PACKAGE := $*UNIT_OUTER.symbol('$?PACKAGE')<value>;
}
else {
$*PACKAGE := $*GLOBALish;
}
# If we're eval'ing in the context of a %?LANG, set up our own
# %*LANG based on it.
if $have_outer && $*UNIT_OUTER.symbol('%?LANG') {
for $*UNIT_OUTER.symbol('%?LANG')<value>.FLATTENABLE_HASH() {
%*LANG{$_.key} := $_.value;
}
}
# Install unless we've no setting, in which case we've likely no
# static lexpad class yet either. Also, UNIT needs a code object.
unless %*COMPILING<%?OPTIONS><setting> eq 'NULL' {
$*W.install_lexical_symbol($*UNIT, 'GLOBALish', $*GLOBALish);
$*W.install_lexical_symbol($*UNIT, 'EXPORT', $*EXPORT);
$*W.install_lexical_symbol($*UNIT, '$?PACKAGE', $*PACKAGE);
$*W.install_lexical_symbol($*UNIT, '::?PACKAGE', $*PACKAGE);
$*DECLARAND := $*W.stub_code_object('Block');
}
my $M := %*COMPILING<%?OPTIONS><M>;
if nqp::defined($M) {
for nqp::islist($M) ?? $M !! [$M] -> $longname {
my $module := $*W.load_module($/,
$longname,
$*GLOBALish);
do_import($/, $module, $longname);
$/.CURSOR.import_EXPORTHOW($module);
}
}
}
<.finishpad>
<.bom>?
<statementlist>
<.install_doc_phaser>
[ $ || <.typed_panic: 'X::Syntax::Confused'> ]
{
# Emit any errors/worries.
self.explain_mystery();
if @*SORROWS {
if +@*SORROWS == 1 && !@*WORRIES {
@*SORROWS[0].throw()
}
else {
$*W.group_exception(@*SORROWS.pop).throw();
}
}
if @*WORRIES {
pir::getstderr__P().print($*W.group_exception().gist());
}
# Install POD-related variables.
$*POD_PAST := $*W.add_constant(
'Array', 'type_new', |$*POD_BLOCKS
);
$*W.install_lexical_symbol(
$*UNIT, '$=pod', $*POD_PAST.compile_time_value
);
# Tag UNIT with a magical lexical. Also if we're compiling CORE,
# give it such a tag too.
if %*COMPILING<%?OPTIONS><setting> eq 'NULL' {
my $marker := $*W.pkg_create_mo($/, %*HOW<package>, :name('!CORE_MARKER'));
$marker.HOW.compose($marker);
$*W.install_lexical_symbol($*UNIT, '!CORE_MARKER', $marker);
}
else {
my $marker := $*W.pkg_create_mo($/, %*HOW<package>, :name('!UNIT_MARKER'));
$marker.HOW.compose($marker);
$*W.install_lexical_symbol($*UNIT, '!UNIT_MARKER', $marker);
}
}
# CHECK time.
{ $*W.CHECK(); }
}
method import_EXPORTHOW($UNIT) {
# See if we've exported any HOWs.
if nqp::existskey($UNIT, 'EXPORTHOW') {
for $UNIT<EXPORTHOW>.WHO {
%*HOW{$_.key} := pir::nqp_decontainerize__PP($_.value);
}
}
}
token statementlist {
:my %*LANG := self.shallow_copy(pir::find_dynamic_lex__Ps('%*LANG'));
:my %*HOW := self.shallow_copy(pir::find_dynamic_lex__Ps('%*HOW'));
:dba('statement list')
:s
[
| $
| <?before <[\)\]\}]>>
| [<statement><.eat_terminator> ]*
]
}
method shallow_copy(%hash) {
my %result;
for %hash {
%result{$_.key} := $_.value;
}
%result
}
rule semilist {
:dba('semicolon list')
[
| <?before <[)\]}]> >
| [<statement><.eat_terminator> ]*
]
}
token statement {
:my $*QSIGIL := '';
:my $*SCOPE := '';
:my $*ACTIONS := %*LANG<MAIN-actions>;
<!before <[\])}]> | $ >
<!stopper>
<!!{ nqp::rebless($/.CURSOR, %*LANG<MAIN>) }>
[
| <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>[0]<sym>;
$/.CURSOR.obs("do..." ~ $s, "repeat..." ~ $s);
}
}
]?
| <?before ';'>
| <?before <stopper> >
| {} <.panic: "Bogus statement">
]
}
token eat_terminator {
|| ';'
|| <?MARKED('endstmt')>
|| <?before ')' | ']' | '}' >
|| $
|| <?stopper>
|| <.typed_panic: 'X::Syntax::Confused'>
}
token xblock($*IMPLICIT = 0) {
:my $*GOAL := '{';
<EXPR> <.ws> <pblock($*IMPLICIT)>
}
token pblock($*IMPLICIT = 0) {
:my $*DECLARAND := $*W.stub_code_object('Block');
:dba('parameterized block')
[
| <lambda>
<.newpad>
:my $*SCOPE := 'my';
<signature>
<blockoid>
| <?[{]>
<.newpad>
<blockoid>
|| <.missing: 'block'>
]
}
token lambda { '->' | '<->' }
token block($*IMPLICIT = 0) {
:my $*DECLARAND := $*W.stub_code_object('Block');
:dba('scoped block')
[ <?[{]> || <.missing: 'block'>]
<.newpad>