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Minor clean up of parse_field_prefixes

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This commit is contained in:
gingerBill
2021-08-15 13:18:06 +01:00
parent 7bbc9a4634
commit 294c8426e6
2 changed files with 49 additions and 38 deletions
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85
src/parser.cpp
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@@ -3393,18 +3393,35 @@ Ast *parse_var_type(AstFile *f, bool allow_ellipsis, bool allow_typeid_token) {
}
enum FieldPrefixKind {
enum FieldPrefixKind : i32 {
FieldPrefix_Unknown = -1,
FieldPrefix_Invalid = 0,
FieldPrefix_using,
FieldPrefix_const,
FieldPrefix_no_alias,
FieldPrefix_c_var_arg,
FieldPrefix_c_vararg,
FieldPrefix_auto_cast,
FieldPrefix_any_int,
};
struct ParseFieldPrefixMapping {
String name;
TokenKind token_kind;
FieldPrefixKind prefix;
FieldFlag flag;
};
gb_global ParseFieldPrefixMapping parse_field_prefix_mappings[] = {
{str_lit("using"), Token_using, FieldPrefix_using, FieldFlag_using},
{str_lit("auto_cast"), Token_auto_cast, FieldPrefix_auto_cast, FieldFlag_auto_cast},
{str_lit("no_alias"), Token_Hash, FieldPrefix_no_alias, FieldFlag_no_alias},
{str_lit("c_vararg"), Token_Hash, FieldPrefix_c_vararg, FieldFlag_c_vararg},
{str_lit("const"), Token_Hash, FieldPrefix_const, FieldFlag_const},
{str_lit("any_int"), Token_Hash, FieldPrefix_any_int, FieldFlag_any_int},
};
FieldPrefixKind is_token_field_prefix(AstFile *f) {
switch (f->curr_token.kind) {
case Token_EOF:
@@ -3420,14 +3437,13 @@ FieldPrefixKind is_token_field_prefix(AstFile *f) {
advance_token(f);
switch (f->curr_token.kind) {
case Token_Ident:
if (f->curr_token.string == "no_alias") {
return FieldPrefix_no_alias;
} else if (f->curr_token.string == "c_vararg") {
return FieldPrefix_c_var_arg;
} else if (f->curr_token.string == "const") {
return FieldPrefix_const;
} else if (f->curr_token.string == "any_int") {
return FieldPrefix_any_int;
for (i32 i = 0; i < gb_count_of(parse_field_prefix_mappings); i++) {
auto *mapping = parse_field_prefix_mappings + i;
if (mapping->token_kind == Token_Hash) {
if (f->curr_token.string == mapping->name) {
return mapping->prefix;
}
}
}
break;
}
@@ -3436,14 +3452,8 @@ FieldPrefixKind is_token_field_prefix(AstFile *f) {
return FieldPrefix_Invalid;
}
u32 parse_field_prefixes(AstFile *f) {
i32 using_count = 0;
i32 no_alias_count = 0;
i32 c_vararg_count = 0;
i32 auto_cast_count = 0;
i32 const_count = 0;
i32 any_int_count = 0;
i32 counts[gb_count_of(parse_field_prefix_mappings)] = {};
for (;;) {
FieldPrefixKind kind = is_token_field_prefix(f);
@@ -3456,30 +3466,31 @@ u32 parse_field_prefixes(AstFile *f) {
continue;
}
switch (kind) {
case FieldPrefix_using: using_count += 1; advance_token(f); break;
case FieldPrefix_no_alias: no_alias_count += 1; advance_token(f); break;
case FieldPrefix_c_var_arg: c_vararg_count += 1; advance_token(f); break;
case FieldPrefix_auto_cast: auto_cast_count += 1; advance_token(f); break;
case FieldPrefix_const: const_count += 1; advance_token(f); break;
case FieldPrefix_any_int: any_int_count += 1; advance_token(f); break;
for (i32 i = 0; i < gb_count_of(parse_field_prefix_mappings); i++) {
if (parse_field_prefix_mappings[i].prefix == kind) {
counts[i] += 1;
advance_token(f);
break;
}
}
}
if (using_count > 1) syntax_error(f->curr_token, "Multiple 'using' in this field list");
if (no_alias_count > 1) syntax_error(f->curr_token, "Multiple '#no_alias' in this field list");
if (c_vararg_count > 1) syntax_error(f->curr_token, "Multiple '#c_vararg' in this field list");
if (auto_cast_count > 1) syntax_error(f->curr_token, "Multiple 'auto_cast' in this field list");
if (const_count > 1) syntax_error(f->curr_token, "Multiple '#const' in this field list");
if (any_int_count > 1) syntax_error(f->curr_token, "Multiple '#any_int' in this field list");
u32 field_flags = 0;
if (using_count > 0) field_flags |= FieldFlag_using;
if (no_alias_count > 0) field_flags |= FieldFlag_no_alias;
if (c_vararg_count > 0) field_flags |= FieldFlag_c_vararg;
if (auto_cast_count > 0) field_flags |= FieldFlag_auto_cast;
if (const_count > 0) field_flags |= FieldFlag_const;
if (any_int_count > 0) field_flags |= FieldFlag_any_int;
for (i32 i = 0; i < gb_count_of(parse_field_prefix_mappings); i++) {
if (counts[i] > 0) {
field_flags |= parse_field_prefix_mappings[i].flag;
if (counts[i] != 1) {
auto *mapping = parse_field_prefix_mappings + i;
String name = mapping->name;
char const *prefix = "";
if (mapping->token_kind == Token_Hash) {
prefix = "#";
}
syntax_error(f->curr_token, "Multiple '%s%.*s' in this field list", prefix, LIT(name));
}
}
}
return field_flags;
}