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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* parse/types.cpp
* - Parsing for type usages
*/
#include "common.hpp"
#include "parseerror.hpp"
#include "../types.hpp"
#include "../ast/ast.hpp"
/// Mappings from internal type names to the core type enum
static const struct {
const char* name;
enum eCoreType type;
} CORETYPES[] = {
{"bool", CORETYPE_BOOL},
{"char", CORETYPE_CHAR},
{"f32", CORETYPE_F32},
{"f64", CORETYPE_F64},
{"i16", CORETYPE_I16},
{"i32", CORETYPE_I32},
{"i64", CORETYPE_I64},
{"i8", CORETYPE_I8},
{"int", CORETYPE_INT},
{"isize", CORETYPE_INT},
{"u16", CORETYPE_U16},
{"u32", CORETYPE_U32},
{"u64", CORETYPE_U64},
{"u8", CORETYPE_U8},
{"uint", CORETYPE_UINT},
{"usize", CORETYPE_UINT},
};
// === PROTOTYPES ===
TypeRef Parse_Type(TokenStream& lex);
TypeRef Parse_Type_Fn(TokenStream& lex, ::std::string abi);
// === CODE ===
TypeRef Parse_Type(TokenStream& lex)
{
//TRACE_FUNCTION;
Token tok;
switch( GET_TOK(tok, lex) )
{
// '!' - Only ever used as part of function prototypes, but is kinda a type... not allowed here though
case TOK_EXCLAM:
throw ParseError::Generic(lex, "! is not a real type");
// '_' = Wildcard (type inferrence variable)
case TOK_UNDERSCORE:
return TypeRef();
// 'extern' - A function type with an ABI
case TOK_RWORD_EXTERN: {
GET_CHECK_TOK(tok, lex, TOK_STRING);
::std::string abi = tok.str();
GET_CHECK_TOK(tok, lex, TOK_RWORD_FN);
return Parse_Type_Fn(lex, abi);
}
// 'fn' - Rust function
case TOK_RWORD_FN:
return Parse_Type_Fn(lex, "");
// '<' - An associated type cast
case TOK_LT:
lex.putback(tok);
return TypeRef(TypeRef::TagPath(), Parse_Path(lex, PATH_GENERIC_TYPE));
#if 0
{
DEBUG("Associated type");
// TODO: This should instead use the path code, not a special case in typing
// <Type as Trait>::Inner
TypeRef base = Parse_Type(lex);
GET_CHECK_TOK(tok, lex, TOK_RWORD_AS);
TypeRef trait = Parse_Type(lex);
GET_CHECK_TOK(tok, lex, TOK_GT);
// TODO: Is just '<Type as Trait>' valid?
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
GET_CHECK_TOK(tok, lex, TOK_IDENT);
::std::string inner_name = tok.str();
return TypeRef(TypeRef::TagAssoc(), ::std::move(base), ::std::move(trait), ::std::move(inner_name));
}
#endif
// <ident> - Either a primitive, or a path
case TOK_IDENT:
// or a primitive
for(unsigned int i = 0; i < sizeof(CORETYPES)/sizeof(CORETYPES[0]); i ++)
{
if( tok.str() < CORETYPES[i].name )
break;
if( tok.str() == CORETYPES[i].name )
return TypeRef(TypeRef::TagPrimitive(), CORETYPES[i].type);
}
if( tok.str() == "str" )
{
// TODO: Create an internal newtype for 'str'
return TypeRef(TypeRef::TagPath(), AST::Path({ AST::PathNode("#",{}), AST::PathNode("str",{}) }));
}
// - Fall through to path handling
// '::' - Absolute path
case TOK_DOUBLE_COLON: {
lex.putback(tok);
::std::vector<AST::Path> traits;
::std::vector< ::std::string> lifetimes;
do {
if( LOOK_AHEAD(lex) == TOK_LIFETIME ) {
GET_TOK(tok, lex);
lifetimes.push_back( tok.str() );
}
else
traits.push_back( Parse_Path(lex, PATH_GENERIC_TYPE) );
} while( GET_TOK(tok, lex) == TOK_PLUS );
lex.putback(tok);
if( traits.size() > 1 || lifetimes.size() > 0 ) {
if( lifetimes.size() )
DEBUG("TODO: Lifetime bounds on trait objects");
return TypeRef(::std::move(traits));
}
else
return TypeRef(TypeRef::TagPath(), traits.at(0));
}
// 'super' - Parent relative path
case TOK_RWORD_SUPER:
GET_CHECK_TOK(tok, lex, TOK_DOUBLE_COLON);
return TypeRef(TypeRef::TagPath(), Parse_PathFrom(lex, AST::Path(AST::Path::TagSuper()), PATH_GENERIC_TYPE));
// HACK! Convert && into & &
case TOK_DOUBLE_AMP:
lex.putback(Token(TOK_AMP));
// '&' - Reference type
case TOK_AMP: {
::std::string lifetime;
// Reference
tok = lex.getToken();
if( tok.type() == TOK_LIFETIME ) {
lifetime = tok.str();
tok = lex.getToken();
}
if( tok.type() == TOK_RWORD_MUT ) {
// Mutable reference
return TypeRef(TypeRef::TagReference(), true, Parse_Type(lex));
}
else {
lex.putback(tok);
// Immutable reference
return TypeRef(TypeRef::TagReference(), false, Parse_Type(lex));
}
throw ParseError::BugCheck("Reached end of Parse_Type:AMP");
}
// '*' - Raw pointer
case TOK_STAR:
// Pointer
switch( GET_TOK(tok, lex) )
{
case TOK_RWORD_MUT:
// Mutable pointer
return TypeRef(TypeRef::TagPointer(), true, Parse_Type(lex));
case TOK_RWORD_CONST:
// Immutable pointer
return TypeRef(TypeRef::TagPointer(), false, Parse_Type(lex));
default:
throw ParseError::Unexpected(lex, tok, Token(TOK_RWORD_CONST));
}
throw ParseError::BugCheck("Reached end of Parse_Type:STAR");
// '[' - Array type
case TOK_SQUARE_OPEN: {
// Array
TypeRef inner = Parse_Type(lex);
if( GET_TOK(tok, lex) == TOK_SEMICOLON ) {
// Sized array
AST::Expr array_size = Parse_Expr(lex, true);
GET_CHECK_TOK(tok, lex, TOK_SQUARE_CLOSE);
return TypeRef(TypeRef::TagSizedArray(), inner, array_size.take_node());
}
else if( tok.type() == TOK_SQUARE_CLOSE )
{
return TypeRef(TypeRef::TagUnsizedArray(), inner);
}
else {
throw ParseError::Unexpected(lex, tok/*, "; or ]"*/);
}
}
// '(' - Tuple (or lifetime bounded trait)
case TOK_PAREN_OPEN: {
DEBUG("Tuple");
if( GET_TOK(tok, lex) == TOK_PAREN_CLOSE )
return TypeRef(TypeRef::TagTuple(), {});
lex.putback(tok);
TypeRef inner = Parse_Type(lex);
if( GET_TOK(tok, lex) == TOK_PLUS )
{
// Lifetime bounded type, NOT a tuple
GET_CHECK_TOK(tok, lex, TOK_LIFETIME);
::std::string lifetime = tok.str();
GET_CHECK_TOK(tok, lex, TOK_PAREN_CLOSE);
// TODO: Actually use lifetime bound
DEBUG("TODO: Use lifetime bound '" << lifetime << " on type " << inner);
return ::std::move(inner);
}
else
{
::std::vector<TypeRef> types;
types.push_back( ::std::move(inner) );
lex.putback(tok);
while( GET_TOK(tok, lex) == TOK_COMMA )
{
if( GET_TOK(tok, lex) == TOK_PAREN_CLOSE )
break;
else
lex.putback(tok);
types.push_back(Parse_Type(lex));
}
CHECK_TOK(tok, TOK_PAREN_CLOSE);
return TypeRef(TypeRef::TagTuple(), types); }
}
default:
throw ParseError::Unexpected(lex, tok);
}
throw ParseError::BugCheck("Reached end of Parse_Type");
}
TypeRef Parse_Type_Fn(TokenStream& lex, ::std::string abi)
{
TRACE_FUNCTION;
Token tok;
::std::vector<TypeRef> args;
GET_CHECK_TOK(tok, lex, TOK_PAREN_OPEN);
while( LOOK_AHEAD(lex) != TOK_PAREN_CLOSE )
{
args.push_back( Parse_Type(lex) );
if( GET_TOK(tok, lex) != TOK_COMMA ) {
lex.putback(tok);
break;
}
}
GET_CHECK_TOK(tok, lex, TOK_PAREN_CLOSE);
TypeRef ret_type = TypeRef(TypeRef::TagUnit());
if( GET_TOK(tok, lex) == TOK_THINARROW )
{
ret_type = Parse_Type(lex);
}
else {
lex.putback(tok);
}
return TypeRef(TypeRef::TagFunction(), ::std::move(abi), ::std::move(args), ::std::move(ret_type));
}
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