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REPL.pm
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REPL.pm
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class REPL { ... }
do {
my sub sorted-set-insert(@values, $value) {
my $low = 0;
my $high = @values.end;
my $insert_pos = 0;
while $low <= $high {
my $middle = floor($low + ($high - $low) / 2);
my $middle_elem = @values[$middle];
if $middle == @values.end {
if $value eq $middle_elem {
return;
} elsif $value lt $middle_elem {
$high = $middle - 1;
} else {
$insert_pos = +@values;
last;
}
} else {
my $middle_plus_one_elem = @values[$middle + 1];
if $value eq $middle_elem || $value eq $middle_plus_one_elem {
return;
} elsif $value lt $middle_elem {
$high = $middle - 1;
} elsif $value gt $middle_plus_one_elem {
$low = $middle + 1;
} else {
$insert_pos = $middle + 1;
last;
}
}
}
splice(@values, $insert_pos, 0, $value);
}
my role ReadlineBehavior[$WHO] {
my &readline = $WHO<&readline>;
my &add_history = $WHO<&add_history>;
my $Readline = try { require Readline }
my $read = $Readline.new;
if ! $*DISTRO.is-win {
$read.read-init-file("/etc/inputrc");
$read.read-init-file("~/.inputrc");
}
method init-line-editor {
$read.read-history($.history-file);
}
method repl-read(Mu \prompt) {
my $line = $read.readline(prompt);
if $line.defined {
$read.add-history($line);
$read.append-history(1, $.history-file);
}
$line
}
}
my role LinenoiseBehavior[$WHO] {
my &linenoise = $WHO<&linenoise>;
my &linenoiseHistoryAdd = $WHO<&linenoiseHistoryAdd>;
my &linenoiseSetCompletionCallback = $WHO<&linenoiseSetCompletionCallback>;
my &linenoiseAddCompletion = $WHO<&linenoiseAddCompletion>;
my &linenoiseHistoryLoad = $WHO<&linenoiseHistoryLoad>;
my &linenoiseHistorySave = $WHO<&linenoiseHistorySave>;
method completions-for-line(Str $line, int $cursor-index) { ... }
method history-file(--> Str:D) { ... }
method init-line-editor {
linenoiseSetCompletionCallback(sub ($line, $c) {
eager self.completions-for-line($line, $line.chars).map(&linenoiseAddCompletion.assuming($c));
});
linenoiseHistoryLoad($.history-file);
}
method teardown-line-editor {
my $err = linenoiseHistorySave($.history-file);
return if !$err;
note "Couldn't save your history to $.history-file";
}
method repl-read(Mu \prompt) {
self.update-completions;
my $line = linenoise(prompt);
if $line.defined {
linenoiseHistoryAdd($line);
}
$line
}
}
my role FallbackBehavior {
method repl-read(Mu \prompt) {
print prompt;
get
}
}
my role Completions {
# RT #129092: jvm can't do CORE::.keys
has @!completions = $*VM.name eq 'jvm'
?? ()
!! CORE::.keys.flatmap({
/^ "&"? $<word>=[\w* <.lower> \w*] $/ ?? ~$<word> !! []
}).sort;
method update-completions(--> Nil) {
my $context := self.compiler.context;
return unless $context;
my $pad := nqp::ctxlexpad($context);
my $it := nqp::iterator($pad);
while $it {
my $k := nqp::iterkey_s(nqp::shift($it));
my $m = $k ~~ /^ "&"? $<word>=[\w* <.lower> \w*] $/;
next if !$m;
my $word = ~$m<word>;
sorted-set-insert(@!completions, $word);
}
my $PACKAGE = self.compiler.eval('$?PACKAGE', :outer_ctx($context));
for $PACKAGE.WHO.keys -> $k {
sorted-set-insert(@!completions, $k);
}
}
method extract-last-word(Str $line) {
my $m = $line ~~ /^ $<prefix>=[.*?] <|w>$<last_word>=[\w*]$/;
return ( $line, '') unless $m;
( ~$m<prefix>, ~$m<last_word> )
}
method completions-for-line(Str $line, int $cursor-index) {
return @!completions unless $line;
# ignore $cursor-index until we have a backend that provides it
my ( $prefix, $word-at-cursor ) = self.extract-last-word($line);
# XXX this could be more efficient if we had a smarter starting index
gather for @!completions -> $word {
if $word ~~ /^ "$word-at-cursor" / {
take $prefix ~ $word;
}
}
}
}
class REPL {
also does Completions;
has Mu $.compiler;
has Bool $!multi-line-enabled;
has IO::Path $!history-file;
has $!save_ctx;
# Unique internal values for out-of-band eval results
has $!need-more-input = {};
has $!control-not-allowed = {};
sub do-mixin($self, Str $module-name, $behavior, Str :$fallback) {
my Bool $problem = False;
try {
CATCH {
when X::CompUnit::UnsatisfiedDependency & { .specification ~~ /"$module-name"/ } {
# ignore it
}
default {
say "I ran into a problem while trying to set up $module-name: $_";
if $fallback {
say "Falling back to $fallback (if present)";
}
$problem = True;
}
}
my $module = do require ::($module-name);
my $new-self = $self but $behavior.^parameterize($module.WHO<EXPORT>.WHO<ALL>.WHO);
$new-self.?init-line-editor();
return ( $new-self, False );
}
( Any, $problem )
}
sub mixin-readline($self, |c) {
do-mixin($self, 'Readline', ReadlineBehavior, |c)
}
sub mixin-linenoise($self, |c) {
do-mixin($self, 'Linenoise', LinenoiseBehavior, |c)
}
sub mixin-line-editor($self) {
my %editor-to-mixin = (
:Linenoise(&mixin-linenoise),
:Readline(&mixin-readline),
:none(-> $self { ( $self but FallbackBehavior, False ) }),
);
if %*ENV<RAKUDO_LINE_EDITOR> -> $line-editor {
if !%editor-to-mixin{$line-editor} {
say "Unrecognized line editor '$line-editor'";
return $self but FallbackBehavior;
}
my $mixin = %editor-to-mixin{$line-editor};
my ( $new-self, $problem ) = $mixin($self);
return $new-self if $new-self;
say "Could not find $line-editor module" unless $problem;
return $self but FallbackBehavior;
}
my ( $new-self, $problem ) = mixin-readline($self, :fallback<Linenoise>);
return $new-self if $new-self;
( $new-self, $problem ) = mixin-linenoise($self);
return $new-self if $new-self;
if $problem {
say 'Continuing without tab completions or line editor';
say 'You may want to consider using rlwrap for simple line editor functionality';
}
elsif !$*DISTRO.is-win and !( %*ENV<_>:exists and %*ENV<_>.ends-with: 'rlwrap' ) {
say 'You may want to `zef install Readline` or `zef install Linenoise` or use rlwrap for a line editor';
}
say '';
$self but FallbackBehavior
}
method new(Mu \compiler, Mu \adverbs) {
my $multi-line-enabled = !%*ENV<RAKUDO_DISABLE_MULTILINE>;
my $self = self.bless();
$self.init(compiler, $multi-line-enabled);
$self = mixin-line-editor($self);
$self
}
method init(Mu \compiler, $multi-line-enabled --> Nil) {
$!compiler := compiler;
$!multi-line-enabled = $multi-line-enabled;
}
method teardown {
self.?teardown-line-editor;
}
method repl-eval($code, \exception, *%adverbs) {
CATCH {
when X::Syntax::Missing {
return $!need-more-input
if $!multi-line-enabled && .pos == $code.chars;
.throw;
}
when X::Comp::FailGoal {
return $!need-more-input
if $!multi-line-enabled && .pos == $code.chars;
.throw;
}
when X::ControlFlow::Return {
return $!control-not-allowed;
}
default {
exception = $_;
return;
}
}
CONTROL {
when CX::Emit | CX::Take { .rethrow; }
when CX::Warn { .gist.say; .resume; }
return $!control-not-allowed;
}
self.compiler.eval($code, |%adverbs);
}
method interactive_prompt() { '> ' }
method repl-loop(*%adverbs) {
say "To exit type 'exit' or '^D'";
my $prompt;
my $code;
sub reset(--> Nil) {
$code = '';
$prompt = self.interactive_prompt;
}
reset;
REPL: loop {
my $newcode = self.repl-read(~$prompt);
my $initial_out_position = $*OUT.tell;
# An undef $newcode implies ^D or similar
if !$newcode.defined {
last;
}
$code = $code ~ $newcode ~ "\n";
if $code ~~ /^ <.ws> $/ {
next;
}
my $*CTXSAVE := self;
my $*MAIN_CTX;
my $output is default(Nil) = self.repl-eval(
$code,
my $exception,
:outer_ctx($!save_ctx),
|%adverbs);
if self.input-incomplete($output) {
$prompt = '* ';
next;
}
if self.input-toplevel-control($output) {
say "Control flow commands not allowed in toplevel";
reset;
next;
}
if $*MAIN_CTX {
$!save_ctx := $*MAIN_CTX;
}
reset;
# Print the result if:
# - there wasn't some other output
# - the result is an *unhandled* Failure
# - print an exception if one had occured
if $exception.DEFINITE {
self.repl-print($exception);
}
elsif $initial_out_position == $*OUT.tell
or $output ~~ Failure and not $output.handled {
self.repl-print($output);
}
# Why doesn't the catch-default in repl-eval catch all?
CATCH {
default { say $_; reset }
}
}
self.teardown;
}
# Inside of the EVAL it does like caller.ctxsave
method ctxsave(--> Nil) {
$*MAIN_CTX := nqp::ctxcaller(nqp::ctx());
$*CTXSAVE := 0;
}
method input-incomplete(Mu $value) {
$value.WHERE == $!need-more-input.WHERE
}
method input-toplevel-control(Mu $value) {
$value.WHERE == $!control-not-allowed.WHERE
}
method repl-print(Mu $value --> Nil) {
say $value;
CATCH {
default { say $_ }
}
}
method history-file(--> Str:D) {
return $!history-file.absolute if $!history-file.defined;
$!history-file = $*ENV<RAKUDO_HIST>
?? $*ENV<RAKUDO_HIST>.IO
!! ($*HOME || $*TMPDIR).add('.perl6/rakudo-history');
without mkdir $!history-file.parent {
note "I ran into a problem trying to set up history: {.exception.message}";
note 'Sorry, but history will not be saved at the end of your session';
}
$!history-file.absolute
}
}
}