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#!/usr/bin/env raku
#
# This Raku program takes a list of C struct and constant definitions and converts
# it to valid Go code.
use v6.d;
#use Grammar::Debugger;
# Not quite C
grammar NQC {
rule TOP { <construct>* }
rule construct { <constant> | <statement> | <comment> }
rule constant { '#define' <identifier> <number> }
rule statement { <struct> ';' }
rule struct { 'struct' <identifier> '{' <member>+ %% ';' '}' }
rule member { <type> <identifier> <arraysize>? }
rule comment { <single-line-comment> | <multi-line-comment> }
rule single-line-comment { '//' <-[\n]>+ }
rule multi-line-comment { '/*' .*? '*/' }
token arraysize { '[' <identifier> ']' }
token type { 'char' | '__s32' | '__u32' | '__u64' }
token identifier { <[a..z A..Z 0..9 _]>+ }
token number { \d+ }
}
class NQCToGoActions {
has Str @!const-names;
has Bool $!constant-type-set;
method TOP($/) {
make "// This file was generated - don't change manually!\n"
~ "package types\n\n"
~ self!constant-go-string-method ~ "\n"
~ $<construct>.map(*.made).join('');
}
method construct($/) {
make $<constant>.made // $<statement>.made // '';
}
method statement($/) {
make "\n" ~ $<struct>.made;
}
method constant($/) {
push @!const-names: ~$<identifier>;
my $const-type = $<identifier>.ends-with('_OP_ID') ?? ' OpId' !! '';
make qq:to/END/;
const {$<identifier>}$const-type = {$<number>}
END
}
method !constant-go-string-method returns Str {
qq:to/END/;
type OpId uint32
func (o OpId) String() string \{
switch (o) \{
{@!const-names.grep(/_OP_ID$/).map({
"case $_: return \"{$_.subst('_OP_ID', '').lc}\""
}).join('; ')}
default: panic(fmt.Sprintf("Unknown OpId: %d", o))
\}
\}
END
}
method struct($/) {
make qq:to/END/;
type {$<identifier>.made} struct \{
{$<member>.map(*.made).join('; ')}
\}
{self!struct-go-string-method($/)}
{($<identifier>.made.ends-with('Event') ?? "\n" ~ self!struct-go-sync-pool($/) !! '')}
END
}
# Generate String() method on the Go struct, for pretty printing.
method !struct-go-string-method($/) returns Str {
my Str $self-ref = $<identifier>.lc.substr(0,1);
my Str @format = $<member>.map({ $_.<identifier>.made ~ ':%v' });
my Str @args = $<member>.map({
my Str $ref = "$self-ref." ~ $_.<identifier>.made;
# Need to convert char-arrays into a Go slice, and then convert via string(...)
($_.<type> eq 'char' && $_.<arraysize>) ?? "string({$ref}[:])" !! $ref;
});
qq:to/END/;
func ($self-ref {$<identifier>.made}) String() string \{
return fmt.Sprintf("{@format.join(' ')}", {@args.join(', ')})
\}
END
}
method !struct-go-sync-pool($/) returns Str {
my Str $identifier = $/<identifier>.made;
qq:to/END/;
var poolOf{$identifier}s = sync.Pool\{
New: func() interface\{\} \{ return &$identifier\{\} \},
\}
func New{$identifier}() *$identifier \{
return poolOf{$identifier}s.Get().(*$identifier);
\}
func Recycle{$identifier}(elem *$identifier) \{
poolOf{$identifier}s.Put(elem)
\}
END
}
method member($/) {
my Str $type = $<identifier>.made eq 'OpId' ?? 'OpId' !! $<type>.made;
make $<identifier>.made ~ ' ' ~ ($<arraysize> // '') ~ $type;
}
method type($/) {
make do given ~$/ {
when 'char' { 'byte' }
when '__s32' { 'int32' }
when '__u32' { 'uint32' }
when '__u64' { 'uint64' }
}
}
method identifier($/) {
# Convert identifier from snake_case (C) to CamelCase (Go)
make $/.Str.split('_').map(*.tc).join('');
}
}
say NQC.parse($*IN.slurp, actions => NQCToGoActions.new).made;
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