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zig fmt: Respect trailing commas in error set declarations 

The logic is not perfect as it doesn't take into account the presence of
doc comments, but it's an improvement over the status quo.
master
LemonBoy 2020-02-28 12:06:43 +01:00 committed by Andrew Kelley
parent 63a4dbc30d
commit 11a4ce42c1
No known key found for this signature in database
GPG Key ID: 7C5F548F728501A9
2 changed files with 43 additions and 17 deletions
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2
lib/std/zig/parser_test.zig
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@ -1509,6 +1509,8 @@ test "zig fmt: error set declaration" {
\\const Error = error{OutOfMemory};
\\const Error = error{};
\\
\\const Error = error{ OutOfMemory, OutOfTime };
\\
);
}

58
lib/std/zig/render.zig
View File

@ -1268,25 +1268,51 @@ fn renderExpression(
}
try renderToken(tree, stream, err_set_decl.error_token, indent, start_col, Space.None); // error
try renderToken(tree, stream, lbrace, indent, start_col, Space.Newline); // {
const new_indent = indent + indent_delta;
var it = err_set_decl.decls.iterator(0);
while (it.next()) |node| {
try stream.writeByteNTimes(' ', new_indent);
const src_has_trailing_comma = blk: {
const maybe_comma = tree.prevToken(err_set_decl.rbrace_token);
break :blk tree.tokens.at(maybe_comma).id == .Comma;
};
if (it.peek()) |next_node| {
try renderExpression(allocator, stream, tree, new_indent, start_col, node.*, Space.None);
try renderToken(tree, stream, tree.nextToken(node.*.lastToken()), new_indent, start_col, Space.Newline); // ,
if (src_has_trailing_comma) {
try renderToken(tree, stream, lbrace, indent, start_col, Space.Newline); // {
const new_indent = indent + indent_delta;
try renderExtraNewline(tree, stream, start_col, next_node.*);
} else {
try renderExpression(allocator, stream, tree, new_indent, start_col, node.*, Space.Comma);
var it = err_set_decl.decls.iterator(0);
while (it.next()) |node| {
try stream.writeByteNTimes(' ', new_indent);
if (it.peek()) |next_node| {
try renderExpression(allocator, stream, tree, new_indent, start_col, node.*, Space.None);
try renderToken(tree, stream, tree.nextToken(node.*.lastToken()), new_indent, start_col, Space.Newline); // ,
try renderExtraNewline(tree, stream, start_col, next_node.*);
} else {
try renderExpression(allocator, stream, tree, new_indent, start_col, node.*, Space.Comma);
}
}
}
try stream.writeByteNTimes(' ', indent);
return renderToken(tree, stream, err_set_decl.rbrace_token, indent, start_col, space); // }
try stream.writeByteNTimes(' ', indent);
return renderToken(tree, stream, err_set_decl.rbrace_token, indent, start_col, space); // }
} else {
try renderToken(tree, stream, lbrace, indent, start_col, Space.Space); // {
var it = err_set_decl.decls.iterator(0);
while (it.next()) |node| {
if (it.peek()) |next_node| {
try renderExpression(allocator, stream, tree, indent, start_col, node.*, Space.None);
const comma_token = tree.nextToken(node.*.lastToken());
assert(tree.tokens.at(comma_token).id == .Comma);
try renderToken(tree, stream, comma_token, indent, start_col, Space.Space); // ,
try renderExtraNewline(tree, stream, start_col, next_node.*);
} else {
try renderExpression(allocator, stream, tree, indent, start_col, node.*, Space.Space);
}
}
return renderToken(tree, stream, err_set_decl.rbrace_token, indent, start_col, space); // }
}
},
.ErrorTag => {
@ -1589,8 +1615,7 @@ fn renderExpression(
}
} else {
var it = switch_case.items.iterator(0);
while (true) {
const node = it.next().?;
while (it.next()) |node| {
if (it.peek()) |next_node| {
try renderExpression(allocator, stream, tree, indent, start_col, node.*, Space.None);
@ -1601,7 +1626,6 @@ fn renderExpression(
} else {
try renderExpression(allocator, stream, tree, indent, start_col, node.*, Space.Comma);
try stream.writeByteNTimes(' ', indent);
break;
}
}
}