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Exception.pm6
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Exception.pm6
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my role X::Comp { ... }
my class X::ControlFlow { ... }
my class Exception {
has $!ex;
has $!bt;
method backtrace(Exception:D:) {
if $!bt { $!bt }
elsif nqp::isconcrete($!ex) {
$!bt := Backtrace.new($!ex);
}
else { '' }
}
# Only valid if .backtrace has not been called yet
method vault-backtrace(Exception:D:) {
nqp::isconcrete($!ex) && $!bt ?? Backtrace.new($!ex) !! ''
}
method reset-backtrace(Exception:D:) {
$!ex := Nil
}
multi method Str(Exception:D:) {
my $str;
if nqp::isconcrete($!ex) {
my str $message = nqp::getmessage($!ex);
$str = nqp::isnull_s($message) ?? '' !! nqp::p6box_s($message);
}
$str ||= (try self.?message);
$str = ~$str if defined $str;
$str // "Something went wrong in {self.WHAT.gist}";
}
multi method gist(Exception:D:) {
my $str;
if nqp::isconcrete($!ex) {
my str $message = nqp::getmessage($!ex);
$str = nqp::isnull_s($message)
?? (try self.?message) // "Died with {self.^name}"
!! nqp::p6box_s($message);
$str ~= "\n";
try $str ~= self.backtrace
|| Backtrace.new()
|| ' (no backtrace available)';
}
else {
$str = (try self.?message) // "Unthrown {self.^name} with no message";
}
$str;
}
method throw(Exception:D: $bt?) {
$!ex := nqp::newexception() unless nqp::isconcrete($!ex) and $bt;
$!bt := $bt; # Even if !$bt
nqp::setpayload($!ex, nqp::decont(self));
nqp::throw($!ex)
}
method rethrow(Exception:D:) {
unless nqp::isconcrete($!ex) {
$!ex := nqp::newexception();
try nqp::setmessage($!ex, self.message);
}
nqp::setpayload($!ex, nqp::decont(self));
nqp::rethrow($!ex)
}
method resume(Exception:D: --> True) {
nqp::resume($!ex);
}
method die(Exception:D:) { self.throw }
method fail(Exception:D:) {
try self.throw;
my $fail := Failure.new($!);
nqp::throwpayloadlexcaller(nqp::const::CONTROL_RETURN, $fail);
CATCH { $fail.exception.throw }
}
method is-compile-time(--> False) { }
}
my class X::SecurityPolicy is Exception {}
my class X::SecurityPolicy::Eval is X::SecurityPolicy {
has $.payload = "EVAL is a very dangerous function!!!";
my role SlurpySentry { }
method message() {
do {
# Remove spaces for die(*@msg)/fail(*@msg) forms
given $.payload {
when SlurpySentry {
$_.list.join;
}
default {
.Str;
}
}
} ~ " (use the MONKEY-SEE-NO-EVAL pragma to override this error,\n"
~ "but only if you're VERY sure your data contains no injection attacks)";
}
method Numeric() { $.payload.Numeric }
method from-slurpy (|cap) {
self.new(:payload(cap does SlurpySentry))
}
}
my class X::AdHoc is Exception {
has $.payload = "Unexplained error";
my role SlurpySentry { }
method message() {
# Remove spaces for die(*@msg)/fail(*@msg) forms
given $.payload {
when SlurpySentry {
$_.list.join;
}
default {
.Str;
}
}
}
method Numeric() { $.payload.Numeric }
method from-slurpy (|cap) {
self.new(:payload(cap does SlurpySentry))
}
}
my class X::NQP::NotFound is Exception {
has $.op;
method message() {
"Could not find nqp::$.op, did you forget 'use nqp;' ?"
}
}
my class X::Dynamic::NotFound is Exception {
has $.name;
method message() {
"Dynamic variable $.name not found";
}
}
my class X::Method::NotFound is Exception {
has Mu $.invocant;
has $.method;
has $.typename;
has Bool $.private = False;
method message() {
my $message = $.private
?? "No such private method '!$.method' for invocant of type '$.typename'"
!! "No such method '$.method' for invocant of type '$.typename'";
my %suggestions;
my int $max_length = do given $.method.chars {
when 0..3 { 1 }
when 4..8 { 2 }
when 9..* { 3 }
}
if $.method eq 'length' {
given $!invocant {
when List { %suggestions{$_} = 0 for <elems> }
when Cool { %suggestions{$_} = 0 for <chars codes>; }
default { %suggestions{$_} = 0 for <elems chars codes>; }
}
}
elsif $.method eq 'bytes' {
%suggestions<encode($encoding).bytes> = 0;
}
if nqp::can($!invocant.HOW, 'methods') {
for $!invocant.^methods(:all)>>.name -> $method_name {
my $dist = StrDistance.new(:before($.method), :after($method_name));
if $dist <= $max_length {
%suggestions{$method_name} = $dist;
}
}
}
if nqp::can($!invocant.HOW, 'private_method_table') {
for $!invocant.^private_method_table.keys -> $method_name {
my $dist = StrDistance.new(:before($.method), :after($method_name));
if $dist <= $max_length {
%suggestions{"!$method_name"} = $dist;
}
}
}
if +%suggestions == 1 {
$message ~= ". Did you mean '%suggestions.keys()'?";
}
elsif +%suggestions > 1 {
$message ~= ". Did you mean any of these?\n { %suggestions.sort(*.value)>>.key.head(4).join("\n ") }\n";
}
$message;
}
}
my class X::Method::InvalidQualifier is Exception {
has $.method;
has $.invocant;
has $.qualifier-type;
method message() {
"Cannot dispatch to method $.method on {$.qualifier-type.^name} "
~ "because it is not inherited or done by {$.invocant.^name}";
}
}
my class X::Role::Parametric::NoSuchCandidate is Exception {
has Mu $.role;
method message {
"No appropriate parametric role variant available for '"
~ $.role.^name
~ "'";
}
}
my class X::Pragma::NoArgs is Exception {
has $.name;
method message { "The '$.name' pragma does not take any arguments." }
}
my class X::Pragma::CannotPrecomp is Exception {
has $.what = 'This compilation unit';
method message { "$.what may not be pre-compiled" }
}
my class X::Pragma::CannotWhat is Exception {
has $.what;
has $.name;
method message { "'$.what $.name' is not an option." }
}
my class X::Pragma::MustOneOf is Exception {
has $.name;
has $.alternatives;
method message { "'$.name' pragma expects one parameter out of $.alternatives." }
}
my class X::Pragma::UnknownArg is Exception {
has $.name;
has $.arg;
method message { "Unknown argument '{$.arg.perl}' specified with the '$.name' pragma." }
}
my class X::Pragma::OnlyOne is Exception {
has $.name;
method message { "The '$.name' pragma only takes one argument." }
}
my role X::Control is Exception {
}
my class CX::Next does X::Control {
method message() { "<next control exception>" }
}
my class CX::Redo does X::Control {
method message() { "<redo control exception>" }
}
my class CX::Last does X::Control {
method message() { "<last control exception>" }
}
my class CX::Take does X::Control {
method message() { "<take control exception>" }
}
my class CX::Warn does X::Control {
has $.message;
}
my class CX::Succeed does X::Control {
method message() { "<succeed control exception>" }
}
my class CX::Proceed does X::Control {
method message() { "<proceed control exception>" }
}
my class CX::Return does X::Control {
method message() { "<return control exception>" }
}
my class CX::Emit does X::Control {
method message() { "<emit control exception>" }
}
my class CX::Done does X::Control {
method message() { "<done control exception>" }
}
sub EXCEPTION(|) {
my Mu $vm_ex := nqp::shift(nqp::p6argvmarray());
my Mu $payload := nqp::getpayload($vm_ex);
if nqp::istype($payload, Exception) {
nqp::bindattr($payload, Exception, '$!ex', $vm_ex);
$payload;
} else {
my int $type = nqp::getextype($vm_ex);
my $ex;
if $type +& nqp::const::CONTROL_NEXT {
$ex := CX::Next.new();
}
elsif $type +& nqp::const::CONTROL_REDO {
$ex := CX::Redo.new();
}
elsif $type +& nqp::const::CONTROL_LAST {
$ex := CX::Last.new();
}
elsif $type == nqp::const::CONTROL_TAKE {
$ex := CX::Take.new();
}
elsif $type == nqp::const::CONTROL_WARN {
my str $message = nqp::getmessage($vm_ex);
$message = 'Warning' if nqp::isnull_s($message) || $message eq '';
$ex := CX::Warn.new(:$message);
}
elsif $type == nqp::const::CONTROL_SUCCEED {
$ex := CX::Succeed.new();
}
elsif $type == nqp::const::CONTROL_PROCEED {
$ex := CX::Proceed.new();
}
elsif $type == nqp::const::CONTROL_RETURN {
$ex := CX::Return.new();
}
elsif $type == nqp::const::CONTROL_EMIT {
$ex := CX::Emit.new();
}
elsif $type == nqp::const::CONTROL_DONE {
$ex := CX::Done.new();
}
#?if !moar
# for MoarVM this check is done in src/Perl6/Metamodel/BOOTSTRAP.nqp, cmp 222d16b0b9
elsif !nqp::isnull_s(nqp::getmessage($vm_ex)) &&
nqp::p6box_s(nqp::getmessage($vm_ex)) ~~ /"Method '" (.*?) "' not found for invocant of class '" (.+)\'$/ {
$ex := X::Method::NotFound.new(
method => ~$0,
typename => ~$1,
);
}
#?endif
else {
$ex := nqp::create(X::AdHoc);
nqp::bindattr($ex, X::AdHoc, '$!payload', nqp::p6box_s(nqp::getmessage($vm_ex) // 'unknown exception'));
}
nqp::bindattr($ex, Exception, '$!ex', $vm_ex);
$ex;
}
}
my class X::Comp::AdHoc { ... }
sub COMP_EXCEPTION(|) {
my Mu $vm_ex := nqp::shift(nqp::p6argvmarray());
my Mu $payload := nqp::getpayload($vm_ex);
if nqp::istype($payload, Exception) {
nqp::bindattr($payload, Exception, '$!ex', $vm_ex);
$payload;
} else {
my $ex := nqp::create(X::Comp::AdHoc);
nqp::bindattr($ex, Exception, '$!ex', $vm_ex);
nqp::bindattr($ex, X::AdHoc, '$!payload', nqp::p6box_s(nqp::getmessage($vm_ex)));
$ex;
}
}
do {
sub print_exception(|) {
my Mu $ex := nqp::atpos(nqp::p6argvmarray(), 0);
my $e := EXCEPTION($ex);
if %*ENV<RAKUDO_EXCEPTIONS_HANDLER> -> $handler {
# REMOVE DEPRECATED CODE ON 201907
Rakudo::Deprecations.DEPRECATED: "PERL6_EXCEPTIONS_HANDLER", Nil,
'2019.07', :file("N/A"), :line("N/A"),
:what<RAKUDO_EXCEPTIONS_HANDLER env var>;
my $class := ::("Exceptions::$handler");
unless nqp::istype($class,Failure) {
temp %*ENV<RAKUDO_EXCEPTIONS_HANDLER> = ""; # prevent looping
unless $class.process($e) {
nqp::getcurhllsym('&THE_END')();
return
}
}
}
if %*ENV<PERL6_EXCEPTIONS_HANDLER> -> $handler {
my $class := ::("Exceptions::$handler");
unless nqp::istype($class,Failure) {
temp %*ENV<PERL6_EXCEPTIONS_HANDLER> = ""; # prevent looping
unless $class.process($e) {
nqp::getcurhllsym('&THE_END')();
return
}
}
}
try {
my $v := $e.vault-backtrace;
my Mu $err := $*ERR;
$e.backtrace; # This is where most backtraces actually happen
if $e.is-compile-time || $e.backtrace && $e.backtrace.is-runtime {
$err.say($e.gist);
if $v and !$e.gist.ends-with($v.Str) {
$err.say("Actually thrown at:");
$err.say($v.Str);
}
}
elsif Rakudo::Internals.VERBATIM-EXCEPTION(0) {
$err.print($e.Str);
}
else {
$err.say("===SORRY!===");
$err.say($e.Str);
}
nqp::getcurhllsym('&THE_END')();
CONTROL { when CX::Warn { .resume } }
}
if $! {
nqp::rethrow(nqp::getattr(nqp::decont($!), Exception, '$!ex'));
$ex
}
}
sub print_control(|) {
nqp::stmts(
(my Mu $ex := nqp::atpos(nqp::p6argvmarray(),0)),
(my int $type = nqp::getextype($ex)),
(my $backtrace = Backtrace.new(nqp::backtrace($ex))),
nqp::if(
nqp::iseq_i($type,nqp::const::CONTROL_WARN),
nqp::stmts(
(my Mu $err := $*ERR),
(my str $msg = nqp::getmessage($ex)),
$err.say(nqp::if(nqp::chars($msg),$msg,"Warning")),
$err.print($backtrace.first-none-setting-line),
nqp::resume($ex)
)
)
);
my $label = $type +& nqp::const::CONTROL_LABELED ?? "labeled " !! "";
if $type +& nqp::const::CONTROL_LAST {
X::ControlFlow.new(illegal => "{$label}last", enclosing => 'loop construct', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_NEXT {
X::ControlFlow.new(illegal => "{$label}next", enclosing => 'loop construct', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_REDO {
X::ControlFlow.new(illegal => "{$label}redo", enclosing => 'loop construct', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_PROCEED {
X::ControlFlow.new(illegal => 'proceed', enclosing => 'when clause', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_SUCCEED {
# XXX: should work like leave() ?
X::ControlFlow.new(illegal => 'succeed', enclosing => 'when clause', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_TAKE {
X::ControlFlow.new(illegal => 'take', enclosing => 'gather', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_EMIT {
X::ControlFlow.new(illegal => 'emit', enclosing => 'supply or react', :$backtrace).throw;
}
elsif $type +& nqp::const::CONTROL_DONE {
X::ControlFlow.new(illegal => 'done', enclosing => 'supply or react', :$backtrace).throw;
}
else {
X::ControlFlow.new(illegal => 'control exception', enclosing => 'handler', :$backtrace).throw;
}
}
my Mu $comp := nqp::getcomp('perl6');
$comp.^add_method('handle-exception',
method (|) {
my Mu $ex := nqp::atpos(nqp::p6argvmarray(), 1);
print_exception($ex);
nqp::exit(1);
0;
}
);
$comp.^add_method('handle-control',
method (|) {
my Mu $ex := nqp::atpos(nqp::p6argvmarray(), 1);
print_control($ex);
nqp::rethrow($ex);
}
);
}
my role X::OS is Exception {
has $.os-error;
method message() { $.os-error }
}
my role X::IO does X::OS { };
my class X::IO::Unknown does X::IO {
has $.trying;
method message { "Unknown IO error trying '$.trying'" }
}
my class X::IO::Rename does X::IO {
has $.from;
has $.to;
method message() {
"Failed to rename '$.from' to '$.to': $.os-error"
}
}
my class X::IO::Copy does X::IO {
has $.from;
has $.to;
method message() {
"Failed to copy '$.from' to '$.to': $.os-error"
}
}
my class X::IO::Lock does X::IO {
has $.lock-type;
method message() { "Could not obtain $.lock-type lock: $.os-error" }
}
my class X::IO::Move does X::IO {
has $.from;
has $.to;
method message() {
"Failed to move '$.from' to '$.to': $.os-error"
}
}
my class X::IO::DoesNotExist does X::IO {
has $.path;
has $.trying;
method message() {
"Failed to find '$.path' while trying to do '.$.trying'"
}
}
my class X::IO::NotAFile does X::IO {
has $.path;
has $.trying;
method message() {
"'$.path' is not a regular file while trying to do '.$.trying'"
}
}
my class X::IO::Null does X::IO {
method message() {
"Cannot use null character (U+0000) as part of the path"
}
}
my class X::IO::Directory does X::IO {
has $.path;
has $.trying;
has $.use;
method message () {
my $x = "'$.path' is a directory, cannot do '.$.trying' on a directory";
if $.use { $x ~= ", try '{$.use}()' instead" }
$x;
}
}
my class X::IO::Symlink does X::IO {
has $.target;
has $.name;
method message() {
"Failed to create symlink called '$.name' on target '$.target': $.os-error"
}
}
my class X::IO::Link does X::IO {
has $.target;
has $.name;
method message() {
"Failed to create link called '$.name' on target '$.target': $.os-error"
}
}
my class X::IO::Mkdir does X::IO {
has $.path;
has $.mode;
method message() {
"Failed to create directory '$.path' with mode '0o{$.mode.fmt("%03o")}': $.os-error"
}
}
my class X::IO::Chdir does X::IO {
has $.path;
method message() {
"Failed to change the working directory to '$.path': $.os-error"
}
}
my class X::IO::Dir does X::IO {
has $.path;
method message() {
"Failed to get the directory contents of '$.path': $.os-error"
}
}
my class X::IO::Cwd does X::IO {
method message() {
"Failed to get the working directory: $.os-error"
}
}
my class X::IO::Flush does X::IO {
method message() {
"Cannot flush handle: $.os-error"
}
}
my class X::IO::NotAChild does X::IO {
has $.path;
has $.child;
method message() {
"Path {$.child.perl} is not a child of path {$.path.perl}"
}
}
my class X::IO::Resolve does X::IO {
has $.path;
method message() { "Failed to completely resolve {$.path.perl}" }
}
my class X::IO::Rmdir does X::IO {
has $.path;
method message() {
"Failed to remove the directory '$.path': $.os-error"
}
}
my class X::IO::Unlink does X::IO {
has $.path;
method message() {
"Failed to remove the file '$.path': $.os-error"
}
}
my class X::IO::Chmod does X::IO {
has $.path;
has $.mode;
method message() {
"Failed to set the mode of '$.path' to '0o{$.mode.fmt("%03o")}': $.os-error"
}
}
my class X::IO::BinaryAndEncoding does X::IO {
method message { "Cannot open a handle in binary mode (:bin) and also specify an encoding" }
}
my class X::IO::BinaryMode does X::IO {
has $.trying;
method message { "Cannot do '$.trying' on a handle in binary mode" }
}
my role X::Comp is Exception {
has $.filename;
has $.pos;
has $.line;
has $.column;
has @.modules;
has $.is-compile-time = False;
has $.pre;
has $.post;
has @.highexpect;
multi method gist(::?CLASS:D: :$sorry = True, :$expect = True) {
if $.is-compile-time {
my ($red,$clear,$green,$yellow,$eject) =
Rakudo::Internals.error-rcgye;
my $r = $sorry ?? self.sorry_heading() !! "";
$r ~= $.filename eq '<unknown file>'
?? $.line == 1
?? $.message
!! "$.message\nat line $.line"
!! "$.message\nat $.filename():$.line";
$r ~= "\n------> $green$.pre$yellow$eject$red$.post$clear" if defined $.pre;
if $expect && @.highexpect {
$r ~= "\n expecting any of:";
for flat @.highexpectΒ».list {
$r ~= "\n $_";
}
}
for @.modules.reverse[1..*] {
my $line = nqp::p6box_i($_<line>);
$r ~= $_<module>.defined
?? "\n from module $_<module> ($_<filename> line $line)"
!! "\n from $_<filename> line $line";
}
$r;
}
else {
self.Exception::gist;
}
}
method sorry_heading() {
my ($red, $clear) = Rakudo::Internals.error-rcgye;
"$red==={$clear}SORRY!$red===$clear Error while compiling{
$.filename eq '<unknown file>'
?? ':'
!! " $.filename"
}\n"
}
method SET_FILE_LINE($file, $line) {
$!filename = $file;
$!line = $line;
$!is-compile-time = True;
}
}
my class X::Comp::Group is Exception {
has $.panic;
has @.sorrows;
has @.worries;
method is-compile-time(--> True) { }
multi method gist(::?CLASS:D:) {
my $r = "";
if $.panic || @.sorrows {
my ($red, $clear) = Rakudo::Internals.error-rcgye;
$r ~= "$red==={$clear}SORRY!$red===$clear\n";
for @.sorrows {
$r ~= .gist(:!sorry, :!expect) ~ "\n";
}
if $.panic {
$r ~= $.panic.gist(:!sorry) ~ "\n";
}
}
if @.worries {
$r ~= $.panic || @.sorrows
?? "Other potential difficulties:\n"
!! "Potential difficulties:\n";
for @.worries {
$r ~= .gist(:!sorry, :!expect).indent(4) ~ "\n";
}
}
$r
}
method message() {
my @m;
for @.sorrows {
@m.append(.message);
}
if $.panic {
@m.append($.panic.message);
}
for @.worries {
@m.append(.message);
}
@m.join("\n")
}
}
my role X::MOP is Exception { }
my class X::Comp::BeginTime does X::Comp {
has str $.use-case;
has $.exception;
method message() {
$!exception ~~ X::MOP
?? $!exception.message
!! "An exception occurred while $!use-case"
}
multi method gist(::?CLASS:D: :$sorry = True) {
my $r = $sorry ?? self.sorry_heading() !! "";
$r ~= "$.message\nat $.filename():$.line";
for @.modules.reverse[1..*] {
my $line = nqp::p6box_i($_<line>);
$r ~= $_<module>.defined
?? "\n from module $_<module> ($_<filename> line $line)"
!! "\n from $_<filename> line $line";
}
unless $!exception ~~ X::MOP {
$r ~= "\nException details:\n" ~ $!exception.gist.indent(2);
}
$r;
}
}
# XXX a hack for getting line numbers from exceptions from the metamodel
my class X::Comp::AdHoc is X::AdHoc does X::Comp {
method is-compile-time(--> True) { }
}
my class X::Comp::FailGoal does X::Comp {
has $.dba;
has $.goal;
has $.line-real;
method is-compile-time(--> True) { }
method message { "Unable to parse expression in $.dba; couldn't find final $.goal"
~ " (corresponding starter was at line $.line-real)" }
}
my role X::Syntax does X::Comp { }
my role X::Pod { }
my class X::NYI is Exception {
has $.feature;
has $.did-you-mean;
has $.workaround;
method message() {
my $msg = "{ $.feature andthen "$_ not" orelse "Not" } yet implemented. Sorry.";
$msg ~= "\nDid you mean: {$.did-you-mean.gist}?" if $.did-you-mean;
$msg ~= "\nWorkaround: $.workaround" if $.workaround;
$msg
}
}
my class X::Comp::NYI is X::NYI does X::Comp { };
my class X::NYI::Available is X::NYI {
has @.available = die("Must give :available<modules> for installation. ");
method available-str {
my @a = @.available;
my $a = @a.pop;
@a ?? (@a.join(', ') || (), $a).join(" or ") !! $a;
}
method message() {
"Please install { self.available-str } for $.feature support. "
}
}
my class X::NYI::BigInt is Exception {
has $.op;
has $.big;
has $.side = 'right';
method message() {
"Big integer $!big not yet supported on {$!side}hand side of '$!op' operator"
}
}
my class X::Experimental does X::Comp {
has $.feature;
has $.use = $!feature;
method message() { "Use of $.feature is experimental; please 'use experimental :$.use'" }
}
my class X::Worry is Exception { }
my class X::Worry::P5 is X::Worry { }
my class X::Worry::P5::Reference is X::Worry::P5 {
method message {
q/To pass an array, hash or sub to a function in Perl 6, just pass it as is.
For other uses of Perl 5's ref operator consider binding with ::= instead.
Parenthesize as \\(...) if you intended a capture of a single variable./
}
}
my class X::Worry::P5::BackReference is X::Worry::P5 {
method message {
q/To refer to a positional match capture, just use $0 (numbering starts at 0).
Parenthesize as \\(...) if you intended a capture of a single numeric value./
}
}
my class X::Worry::P5::LeadingZero is X::Worry::P5 {
has $.value;
method message {
'Leading 0 has no meaning. If you meant to create an octal number'
~ ", use '0o' prefix" ~ (
#?if jvm
$!value ~~ /<[89]>/
#?endif
#?if !jvm
$!value.comb.grep(*.unival > 7)
#?endif
?? ", but note that $!value is not a valid octal number"
!! "; like, '0o$!value'"
) ~ '. If you meant to create a string, please add quotation marks.'
}
}
my class X::Worry::Precedence::Range is X::Worry {
has $.action;
method message {
"To $!action a range, parenthesize the whole range.
(Or parenthesize the whole endpoint expression, if you meant that.)"
}
}
my class X::Trait::Invalid is Exception {
has $.type; # is, will, of etc.
has $.subtype; # wrong subtype being tried
has $.declaring; # variable, sub, parameter, etc.
has $.name; # '$foo', '@bar', etc.
method message () {
"Cannot use '$.type $.subtype' on $.declaring '$.name'."
}
}
my class X::Trait::Unknown is Exception {
has $.type; # is, will, of etc.
has $.subtype; # wrong subtype being tried
has $.declaring; # variable, sub, parameter, etc.
method message () {
"Can't use unknown trait '$.type $.subtype' in a$.declaring declaration."
}
}
my class X::Comp::Trait::Unknown is X::Trait::Unknown does X::Comp { };
my class X::Trait::NotOnNative is Exception {
has $.type; # is, will, of etc.
has $.subtype; # wrong subtype being tried
has $.native; # type of native (optional)
method message () {
"Can't use trait '$.type $.subtype' on a native"
~ ( $.native ?? " $.native." !! "." );
}
}
my class X::Comp::Trait::NotOnNative is X::Trait::NotOnNative does X::Comp { };
my class X::Trait::Scope is Exception {
has $.type; # is, will, of etc.
has $.subtype; # export
has $.declaring; # type name of the object
has $.scope; # not supported (but used) scope
has $.supported; # hint about what is allowed instead
method message () {
"Can't apply trait '$.type $.subtype' on a $.scope scoped $.declaring."
~ ( $.supported ?? " Only {$.supported.join(' and ')} scoped {$.declaring}s are supported." !! '' );
}
}
my class X::Comp::Trait::Scope is X::Trait::Scope does X::Comp { };
my class X::Exhausted is Exception {
has $.what;
has $.reason;
method message {
$.reason
?? "Could not create another $.what because of: $.reason"
!! "Could not create another $.what"
}
}
my class X::OutOfRange is Exception {
has $.what = 'Argument';
has $.got = '<unknown>';
has $.range = '<unknown>';
has $.comment;
method message() {
my $result = $.comment.defined
?? "$.what out of range. Is: $.got.gist(), should be in $.range.gist(); $.comment"
!! "$.what out of range. Is: $.got.gist(), should be in $.range.gist()";
$result;
}
}
my class X::Buf::AsStr is Exception {
has $.method;
method message() {
"Cannot use a Buf as a string, but you called the $.method method on it";
}
}
my class X::Buf::Pack is Exception {
has $.directive;
method message() {
"Unrecognized directive '$.directive'";
}
}
my class X::Buf::Pack::NonASCII is Exception {
has $.char;
method message() {
"non-ASCII character '$.char' while processing an 'A' template in pack";
}
}
my class X::Signature::Placeholder does X::Comp {
has $.placeholder;
method message() {
"Placeholder variable '$.placeholder' cannot override existing signature";
}
}
my class X::Placeholder::Block does X::Comp {
has $.placeholder;
method message() {
"Placeholder variable $.placeholder may not be used here because the surrounding block takes no signature";
}
}
my class X::Placeholder::NonPlaceholder does X::Comp {
has $.variable_name;
has $.placeholder;
has $.decl;
method message() {
my $decl = $!decl ?? ' ' ~ $!decl !! '';
"$!variable_name has already been used as a non-placeholder in the surrounding$decl block,\n" ~
" so you will confuse the reader if you suddenly declare $!placeholder here"
}
}
my class X::Placeholder::Mainline is X::Placeholder::Block {
method message() {
"Cannot use placeholder parameter $.placeholder outside of a sub or block"
}
}
my class X::Placeholder::Attribute is X::Placeholder::Block {
method message() {
"Cannot use placeholder parameter $.placeholder in an attribute initializer"
}
}
my class X::Undeclared does X::Comp {
has $.what = 'Variable';
has $.symbol;
has @.suggestions;