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[JS Parser] Class Static Initialization Blocks

Browse Source 
https://github.com/tc39/proposal-class-static-block
This commit is contained in:
Jarred Sumner
2022-02-27 01:48:10 -08:00
parent 1958f7adb5
commit 152f63b019
1 changed files with 62 additions and 0 deletions
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62
src/js_parser/js_parser.zig
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@@ -8968,6 +8968,39 @@ fn NewParser_(
},
}
}
} else if (p.lexer.token == .t_open_brace and strings.eqlComptime(name, "static")) {
const loc = p.lexer.loc();
try p.lexer.next();
const old_fn_or_arrow_data_parse = p.fn_or_arrow_data_parse;
p.fn_or_arrow_data_parse = .{
.is_return_disallowed = true,
.allow_super_property = true,
.allow_await = .forbid_all,
};
_ = try p.pushScopeForParsePass(.class_static_init, loc);
var _parse_opts = ParseStatementOptions{};
var stmts = try p.parseStmtsUpTo(.t_close_brace, &_parse_opts);
p.popScope();
p.fn_or_arrow_data_parse = old_fn_or_arrow_data_parse;
try p.lexer.expect(.t_close_brace);
var block = p.allocator.create(
G.ClassStaticBlock,
) catch unreachable;
block.* = G.ClassStaticBlock{
.stmts = js_ast.BabyList(Stmt).init(stmts),
.loc = loc,
};
return G.Property{
.kind = .class_static_block,
.class_static_block = block,
};
}
}
@@ -13071,6 +13104,13 @@ fn NewParser_(
}
for (class.properties) |*property| {
if (property.kind == .class_static_block) {
if (!p.stmtsCanBeRemovedIfUnused(property.class_static_block.?.stmts.slice())) {
return false;
}
continue;
}
if (!p.exprCanBeRemovedIfUnused(&(property.key orelse unreachable))) {
return false;
}
@@ -14970,6 +15010,28 @@ fn NewParser_(
var i: usize = 0;
while (i < class.properties.len) : (i += 1) {
var property = &class.properties[i];
if (property.kind == .class_static_block) {
var old_fn_or_arrow_data = p.fn_or_arrow_data_visit;
var old_fn_only_data = p.fn_only_data_visit;
p.fn_or_arrow_data_visit = .{};
p.fn_only_data_visit = .{ .is_this_nested = true, .is_new_target_allowed = true };
p.pushScopeForVisitPass(.class_static_init, property.class_static_block.?.loc) catch unreachable;
// Make it an error to use "arguments" in a static class block
p.current_scope.forbid_arguments = true;
var list = property.class_static_block.?.stmts.listManaged(p.allocator);
p.visitStmts(&list, .fn_body) catch unreachable;
property.class_static_block.?.stmts = js_ast.BabyList(Stmt).fromList(list);
p.popScope();
p.fn_or_arrow_data_visit = old_fn_or_arrow_data;
p.fn_only_data_visit = old_fn_only_data;
continue;
}
property.ts_decorators = p.visitTSDecorators(property.ts_decorators);
const is_private = if (property.key != null) @as(Expr.Tag, property.key.?.data) == .e_private_identifier else false;