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disallow declarations between container fields

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Vexu 2020-04-18 19:42:45 +03:00
parent 6c907a3509
commit fff00c3bbb
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GPG Key ID: 59AEB8936E16A6AC
2 changed files with 52 additions and 0 deletions
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37
src/parser.cpp
View File

@ -526,6 +526,15 @@ static void ast_parse_container_doc_comments(ParseContext *pc, Buf *buf) {
}
}
enum ContainerFieldState {
// no fields have been seen
ContainerFieldStateNone,
// currently parsing fields
ContainerFieldStateSeen,
// saw fields and then a declaration after them
ContainerFieldStateEnd,
};
// ContainerMembers
// <- TestDecl ContainerMembers
// / TopLevelComptime ContainerMembers
@ -537,17 +546,29 @@ static AstNodeContainerDecl ast_parse_container_members(ParseContext *pc) {
AstNodeContainerDecl res = {};
Buf tld_doc_comment_buf = BUF_INIT;
buf_resize(&tld_doc_comment_buf, 0);
ContainerFieldState field_state = ContainerFieldStateNone;
Token *first_token = nullptr;
for (;;) {
ast_parse_container_doc_comments(pc, &tld_doc_comment_buf);
Token *peeked_token = peek_token(pc);
AstNode *test_decl = ast_parse_test_decl(pc);
if (test_decl != nullptr) {
if (field_state == ContainerFieldStateSeen) {
field_state = ContainerFieldStateEnd;
first_token = peeked_token;
}
res.decls.append(test_decl);
continue;
}
AstNode *top_level_comptime = ast_parse_top_level_comptime(pc);
if (top_level_comptime != nullptr) {
if (field_state == ContainerFieldStateSeen) {
field_state = ContainerFieldStateEnd;
first_token = peeked_token;
}
res.decls.append(top_level_comptime);
continue;
}
@ -555,11 +576,17 @@ static AstNodeContainerDecl ast_parse_container_members(ParseContext *pc) {
Buf doc_comment_buf = BUF_INIT;
ast_parse_doc_comments(pc, &doc_comment_buf);
peeked_token = peek_token(pc);
Token *visib_token = eat_token_if(pc, TokenIdKeywordPub);
VisibMod visib_mod = visib_token != nullptr ? VisibModPub : VisibModPrivate;
AstNode *top_level_decl = ast_parse_top_level_decl(pc, visib_mod, &doc_comment_buf);
if (top_level_decl != nullptr) {
if (field_state == ContainerFieldStateSeen) {
field_state = ContainerFieldStateEnd;
first_token = peeked_token;
}
res.decls.append(top_level_decl);
continue;
}
@ -572,6 +599,16 @@ static AstNodeContainerDecl ast_parse_container_members(ParseContext *pc) {
AstNode *container_field = ast_parse_container_field(pc);
if (container_field != nullptr) {
switch (field_state) {
case ContainerFieldStateNone:
field_state = ContainerFieldStateSeen;
break;
case ContainerFieldStateSeen:
break;
case ContainerFieldStateEnd:
ast_error(pc, first_token, "declarations are not allowed between container fields");
}
assert(container_field->type == NodeTypeStructField);
container_field->data.struct_field.doc_comments = doc_comment_buf;
container_field->data.struct_field.comptime_token = comptime_token;

15
test/compile_errors.zig
View File

@ -2,6 +2,21 @@ const tests = @import("tests.zig");
const std = @import("std");
pub fn addCases(cases: *tests.CompileErrorContext) void {
cases.add("declaration between fields",
\\const S = struct {
\\ a: usize,
\\ const foo = 2;
\\ const bar = 2;
\\ const baz = 2;
\\ b: usize,
\\};
\\comptime {
\\ _ = S;
\\}
, &[_][]const u8{
"tmp.zig:3:5: error: declarations are not allowed between container fields",
});
cases.add("non-extern function with var args",
\\fn foo(args: ...) void {}
\\export fn entry() void {