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make declaration, assignment, and say() work
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Carl Masak
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Dec 8, 2014
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role Val {} | ||
role Val::None is Val {} | ||
role Val::Int is Val { has Int $.value } | ||
role Val::Str is Val { has Str $.value } | ||
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sub children(*@c) { | ||
"\n" ~ @c.join("\n").indent(2) | ||
} | ||
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role Q { | ||
} | ||
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role Q::Literal::Int does Q { | ||
has $.value; | ||
method new(Int $value) { self.bless(:$value) } | ||
method Str { "Int[$.value]" } | ||
method eval($) { Val::Int.new(:$.value) } | ||
} | ||
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role Q::Literal::Str does Q { | ||
has $.value; | ||
method new(Str $value) { self.bless(:$value) } | ||
method Str { qq[Str["$.value"]] } | ||
method eval($) { Val::Str.new(:$.value) } | ||
} | ||
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role Q::Term::Identifier does Q { | ||
has $.name; | ||
method new(Str $name) { self.bless(:$name) } | ||
method Str { "Identifier[$.name]" } | ||
method eval($runtime) { | ||
return $runtime.get-var($.name); | ||
} | ||
} | ||
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role Q::Expr::Assignment does Q { | ||
has $.ident; | ||
has $.expr; | ||
method new($ident, $expr) { self.bless(:$ident, :$expr) } | ||
method Str { "Assign" ~ children($.ident, $.expr) } | ||
method eval($runtime) { | ||
my $value = $.expr.eval($runtime); | ||
$runtime.put-var($.ident.name, $value); | ||
return $value; | ||
} | ||
} | ||
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role Q::Expr::Call::Sub does Q { | ||
has $.ident; | ||
has @.args; | ||
method new($ident, *@args) { self.bless(:$ident, :@args) } | ||
method Str { "Call" ~ children($.ident, |@.args) } | ||
method eval($runtime) { | ||
# TODO: de-hack -- wants to be a hash of builtins somewhere | ||
die "Unknown sub {$.ident.name}" | ||
unless $.ident.name eq "say"; | ||
my $arg = @.args[0].eval($runtime); | ||
$runtime.output.say($arg.value); | ||
Val::None.new; | ||
} | ||
} | ||
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role Q::Statement::Expr does Q { | ||
has $.expr; | ||
method new($expr) { self.bless(:$expr) } | ||
method Str { "Expr" ~ children($.expr) } | ||
method run($runtime) { | ||
$.expr.eval($runtime); | ||
} | ||
} | ||
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role Q::Statement::VarDecl does Q { | ||
has $.ident; | ||
has $.assignment; | ||
method new($ident, $assignment = Nil) { self.bless(:$ident, :$assignment) } | ||
method Str { "VarDecl" ~ children($.ident, |$.assignment) } | ||
method run($runtime) { | ||
# TODO: should have an if statement here, but need a test case for it | ||
$.assignment.eval($runtime); | ||
} | ||
} | ||
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role Q::CompUnit does Q { | ||
has @.statements; | ||
method new(*@statements) { self.bless(:@statements) } | ||
method Str { "CompUnit" ~ children(@.statements) } | ||
method run($runtime) { | ||
for @.statements -> $statement { | ||
$statement.run($runtime); | ||
} | ||
} | ||
} | ||
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role Runtime { | ||
has $.output; | ||
has %!pad; | ||
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method run($compunit) { | ||
$compunit.run(self); | ||
} | ||
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method put-var($name, $value) { | ||
%!pad{$name} = $value; | ||
} | ||
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method get-var($name) { | ||
return %!pad{$name}; | ||
} | ||
} | ||
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role _007 { | ||
method runtime(:$output = $*OUT) { | ||
Runtime.new(:$output); | ||
} | ||
} |
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use v6; | ||
use _007; | ||
use Test; | ||
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sub read(Str $ast) is export { | ||
my %qclass_lookup = | ||
int => Q::Literal::Int, | ||
str => Q::Literal::Str, | ||
ident => Q::Term::Identifier, | ||
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assign => Q::Expr::Assignment, | ||
call => Q::Expr::Call::Sub, | ||
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vardecl => Q::Statement::VarDecl, | ||
stexpr => Q::Statement::Expr, | ||
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compunit => Q::CompUnit, | ||
; | ||
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my grammar _007::Syntax { | ||
regex TOP { \s* <expr> \s* } | ||
proto token expr {*} | ||
token expr:list { '(' ~ ')' [<expr>+ % \s+] } | ||
token expr:int { \d+ } | ||
token expr:symbol { \w+ } | ||
token expr:str { '"' ~ '"' (<-["]>+) } | ||
} | ||
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my $actions = role { | ||
method TOP($/) { make $<expr>.ast } | ||
method expr:list ($/) { | ||
my $qname = ~$<expr>[0]; | ||
die "Unknown name: $qname" | ||
unless %qclass_lookup{$qname} :exists; | ||
my $qclass = %qclass_lookup{$qname}; | ||
my @rest = $<expr>».ast[1..*]; | ||
make $qclass.new(|@rest); | ||
} | ||
method expr:symbol ($/) { make ~$/ } | ||
method expr:int ($/) { make +$/ } | ||
method expr:str ($/) { make ~$0 } | ||
}; | ||
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_007::Syntax.parse($ast, :$actions) | ||
or die "failure"; | ||
return $/.ast; | ||
} | ||
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role Output { | ||
has $.result = ""; | ||
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method say($s) { $!result ~= $s ~ "\n" } | ||
} | ||
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sub is-result($input, $expected, $desc = "MISSING TEST DESCRIPTION") is export { | ||
my $ast = read($input); | ||
my $output = Output.new; | ||
my $runtime = _007.runtime(:$output); | ||
$runtime.run($ast, :$output); | ||
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is $output.result, $expected, $desc; | ||
} | ||
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use v6; | ||
use Test; | ||
use _007::Test; | ||
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{ | ||
my $ast = q:to/./; | ||
(compunit | ||
(vardecl (ident "n") (assign (ident "n") (int 7))) | ||
(stexpr (call (ident "say") (ident "n")))) | ||
. | ||
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is-result $ast, "7\n", "int type works"; | ||
} | ||
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{ | ||
my $ast = q:to/./; | ||
(compunit | ||
(vardecl (ident "s") (assign (ident "s") (str "Bond"))) | ||
(stexpr (call (ident "say") (ident "s")))) | ||
. | ||
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is-result $ast, "Bond\n", "str type works"; | ||
} | ||
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done; |