mpw/bin/template_parser.lemon

%token_prefix tk
%name TemplateParse
%extra_argument { Debug::TemplateParseInfo *info }


%include {
	
	#include <string>
	#include <stdlib.h>
	#include <cassert>
	#include <cstddef>

	#include "template.h"

	using namespace Debug;
}

%type struct_fields  { FieldEntry * }
%type struct_field  { FieldEntry * }

start ::= templates.

templates ::= templates struct.
templates ::= templates typedef.
templates ::= .

// typedeffing arrays or pointers is not allowed.

typedef ::= TYPEDEF type(a) IDENTIFIER(b). {
	CreateTypedef((std::string *)b, a, info);
}

struct ::= STRUCT IDENTIFIER(a) LBRACE struct_fields(b) RBRACE SEMI.
{
	CreateTemplate((std::string *)a, b, info);
}

struct_fields(rhs) ::= struct_fields(a) struct_field(b). {
	// reverse order?
	b->next = a;
	rhs = b;
}

struct_fields(rhs) ::= struct_field(a). {
	rhs = a;
}

struct_field(rhs) ::= type(a) IDENTIFIER(b) array_count(c) SEMI.
{
	FieldEntry *e = (FieldEntry *)calloc(sizeof(FieldEntry), 1);

	e->name = (std::string *)b;
	e->type = a;
	e->count = c;
	rhs = e;
}

struct_field(rhs) ::= opt_volatile TEMPLATE(a) opt_star(star) IDENTIFIER(b) array_count(c) SEMI. {
	FieldEntry *e = (FieldEntry *)calloc(sizeof(FieldEntry), 1);

	e->name = (std::string *)b;
	e->type = star ? kStructPtr : kStruct;
	e->tmpl = (Template)a;
	e->count = c;

	rhs = e;
}

%type array_count { int }
array_count(rhs) ::= . { rhs = 0; }
array_count(rhs) ::= LBRACKET INTEGER(a) RBRACKET. { 
	int i = (int)(ptrdiff_t)a;
	if (i == 0) {
		fprintf(stderr, "Template error: line %u: 0-sized arrays are not allowed.\n", 
			info->LineNumber);
		i = 1;
	}
	rhs = i; 
}

%type type { int }
type(rhs) ::= opt_volatile typecode(a). { rhs = a; }

// this is an expected error... 
type(rhs) ::= opt_volatile IDENTIFIER(xxx). {

	// ugh, Lemon will blindly replace text within a string.
	fprintf(stderr, "Template error: line %u: %s is not a known type.\n", 
		info->LineNumber, ((std::string *)xxx)->c_str());

	rhs = 'i';
}


opt_volatile ::= .
opt_volatile ::= VOLATILE.


%type typecode { int }
typecode(rhs) ::= SIGNED. { rhs = kSInt32; }
typecode(rhs) ::= UNSIGNED. {rhs = kUInt32; }

typecode(rhs) ::= opt_signed CHAR. { rhs = kSInt8; }
typecode(rhs) ::= UNSIGNED CHAR. { rhs = kUInt8; }

typecode(rhs) ::= opt_signed SHORT. { rhs = kSInt16; }
typecode(rhs) ::= UNSIGNED SHORT. { rhs = kUInt16; }

typecode(rhs) ::= opt_signed LONG opt_int. { rhs = kSInt32; }
typecode(rhs) ::= UNSIGNED LONG opt_int. { rhs = kUInt32; }

typecode(rhs) ::= opt_signed LONG LONG. { rhs = kSInt64; }
typecode(rhs) ::= UNSIGNED LONG LONG. { rhs = kUInt64; }

typecode(rhs) ::= TYPECODE(a). { rhs = (int)(ptrdiff_t)a; }

/* pointers are not fully supported yet */
typecode(rhs) ::= VOID STAR. { rhs = kVoidPtr; }

opt_signed ::= .
opt_signed ::= SIGNED.

opt_int ::= .
opt_int ::= INT.

%type opt_star { int }
opt_star(rhs) ::= . { rhs = 0; }
opt_star(rhs) ::= STAR. { rhs = 1; }