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Unreal parsing support: Added MF_Allow_As_Attribute & MF_Allow_As_Definition

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This commit is contained in:
Edward R. Gonzalez
2024-12-15 13:39:00 -05:00
parent 572e957c17
commit 0b03b3cd92
5 changed files with 88 additions and 37 deletions

58
base/components/parser.cpp

@@ -204,6 +204,7 @@ internal CodeBody parse_global_nspace ( CodeType which
internal Code parse_global_nspace_constructor_destructor( CodeSpecifiers specifiers );
internal Token parse_identifier ( bool* possible_member_function );
internal CodeInclude parse_include ();
internal Code parse_macro_as_definiton ( CodeAttributes attributes, CodeSpecifiers specifiers );
internal CodeOperator parse_operator_after_ret_type ( ModuleFlag mflags, CodeAttributes attributes, CodeSpecifiers specifiers, CodeTypename ret_type );
internal Code parse_operator_function_or_variable( bool expects_function, CodeAttributes attributes, CodeSpecifiers specifiers );
internal CodePragma parse_pragma ();
@@ -578,7 +579,7 @@ CodeAttributes parse_attributes()
s32 len = 0;
// There can be more than one attribute. If there is flatten them to a single string.
// TODO(Ed): Support keeping an linked list of attributes similar to parameters
// TODO(Ed): Support chaining attributes (Use parameter linkage pattern)
while ( left && tok_is_attribute(currtok) )
{
if ( check( Tok_Attribute_Open ) )
@@ -2434,6 +2435,12 @@ Code parse_operator_function_or_variable( bool expects_function, CodeAttributes
Code result = InvalidCode;
Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
if (macro_stmt) {
parser_pop(& _ctx->parser);
return macro_stmt;
}
CodeTypename type = parser_parse_type( parser_not_from_template, nullptr );
// <Attributes> <Specifiers> <ReturnType/ValueType>
@@ -2506,6 +2513,36 @@ Code parse_operator_function_or_variable( bool expects_function, CodeAttributes
return result;
}
internal
Code parse_macro_as_definiton( CodeAttributes attributes, CodeSpecifiers specifiers )
{
push_scope();
if (currtok.Type != Tok_Preprocess_Macro_Stmt ) {
parser_pop(& _ctx->parser);
return NullCode;
}
Macro* macro = lookup_macro(currtok.Text);
b32 can_resolve_to_definition = macro && bitfield_is_set(MacroFlags, macro->Flags, MF_Allow_As_Definition);
if ( ! can_resolve_to_definition) {
parser_pop(& _ctx->parser);
return NullCode;
}
// TODO(Ed): When AST_Macro is made, have it support attributs and specifiers for when its behaving as a declaration/definition.
Code code = parse_simple_preprocess( Tok_Preprocess_Macro_Stmt );
// Attributes and sepcifiers will be collapsed into the macro's serialization.
StrBuilder resolved_definition = strbuilder_fmt_buf(_ctx->Allocator_Temp, "%S %S %S"
, attributes ? strbuilder_to_str( attributes_to_strbuilder(attributes)) : txt("")
, specifiers ? strbuilder_to_str( specifiers_to_strbuilder(specifiers)) : txt("")
, code->Content
);
Code result = untyped_str( strbuilder_to_str(resolved_definition) );
parser_pop(& _ctx->parser);
return result;
}
internal
CodePragma parse_pragma()
{
@@ -3761,8 +3798,11 @@ CodeEnum parser_parse_enum( bool inplace_def )
// Unreal UMETA macro support
if ( currtok.Type == Tok_Preprocess_Macro_Expr ) {
eat( Tok_Preprocess_Macro_Expr );
Code macro = parse_simple_preprocess( Tok_Preprocess_Macro_Expr );
// <Name> = <Expression> <Macro>
// We're intentially ignoring this code as its going to be serialized as an untyped string with the rest of the enum "entry".
// TODO(Ed): We need a CodeEnumEntry, AST_EnumEntry types
}
if ( currtok.Type == Tok_Comma )
@@ -4060,6 +4100,13 @@ CodeFn parser_parse_function()
}
// <export> <Attributes> <Specifiers>
// Note(Ed): We're enforcing that using this codepath requires non-macro jank.
// Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
// if (macro_stmt) {
// parser_pop(& _ctx->parser);
// return macro_stmt;
// }
CodeTypename ret_type = parser_parse_type(parser_not_from_template, nullptr);
if ( cast(Code, ret_type) == Code_Invalid ) {
parser_pop(& _ctx->parser);
@@ -5448,6 +5495,13 @@ CodeVar parser_parse_variable()
}
// <ModuleFlags> <Attributes> <Specifiers>
// Note(Ed): We're enforcing that using this codepath requires non-macro jank.
// Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
// if (macro_stmt) {
// parser_pop(& _ctx->parser);
// return macro_stmt;
// }
CodeTypename type = parser_parse_type(parser_not_from_template, nullptr);
// <ModuleFlags> <Attributes> <Specifiers> <ValueType>