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std.fmt: fix formatting of array pointers

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- Clean up array formatting code. Remove buggy formatting of array
pointers, deference pointer to reuse existing array formatting logic.
- Change default specifier for array pointers to be "{any}", to be
consistent with slices.
- Allow using "{x}" and "{e}" for arrays and slices for all number
types, including u8.

Fixes #18185
This commit is contained in:
Vitalijus Valantiejus 2023-12-21 22:43:12 +00:00 • committed by Veikka Tuominen
parent 70b248497a
commit fd98fc1c5f
1 changed files with 32 additions and 48 deletions
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74
lib/std/fmt.zig
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@ -435,7 +435,7 @@ pub fn defaultSpec(comptime T: type) [:0]const u8 {
.Array => |_| return ANY,
.Pointer => |ptr_info| switch (ptr_info.size) {
.One => switch (@typeInfo(ptr_info.child)) {
.Array => |_| return "*",
.Array => |_| return ANY,
else => {},
},
.Many, .C => return "*",
@ -599,26 +599,7 @@ pub fn formatType(
},
.Pointer => |ptr_info| switch (ptr_info.size) {
.One => switch (@typeInfo(ptr_info.child)) {
.Array => |info| {
if (actual_fmt.len == 0)
@compileError("cannot format array ref without a specifier (i.e. {s} or {*})");
if (info.child == u8) {
switch (actual_fmt[0]) {
's', 'x', 'X', 'e', 'E' => {
comptime checkTextFmt(actual_fmt);
return formatBuf(value, options, writer);
},
else => {},
}
}
for (value, 0..) |item, i| {
comptime checkTextFmt(actual_fmt);
if (i != 0) try formatBuf(", ", options, writer);
try formatBuf(item, options, writer);
}
return;
},
.Enum, .Union, .Struct => {
.Array, .Enum, .Union, .Struct => {
return formatType(value.*, actual_fmt, options, writer, max_depth);
},
else => return format(writer, "{s}@{x}", .{ @typeName(ptr_info.child), @intFromPtr(value) }),
@ -629,14 +610,8 @@ pub fn formatType(
if (ptr_info.sentinel) |_| {
return formatType(mem.span(value), actual_fmt, options, writer, max_depth);
}
if (ptr_info.child == u8) {
switch (actual_fmt[0]) {
's', 'x', 'X', 'e', 'E' => {
comptime checkTextFmt(actual_fmt);
if (actual_fmt[0] == 's' and ptr_info.child == u8) {
return formatBuf(mem.span(value), options, writer);
},
else => {},
}
}
invalidFmtError(fmt, value);
},
@ -646,14 +621,8 @@ pub fn formatType(
if (max_depth == 0) {
return writer.writeAll("{ ... }");
}
if (ptr_info.child == u8) {
switch (actual_fmt[0]) {
's', 'x', 'X', 'e', 'E' => {
comptime checkTextFmt(actual_fmt);
if (actual_fmt[0] == 's' and ptr_info.child == u8) {
return formatBuf(value, options, writer);
},
else => {},
}
}
try writer.writeAll("{ ");
for (value, 0..) |elem, i| {
@ -671,14 +640,8 @@ pub fn formatType(
if (max_depth == 0) {
return writer.writeAll("{ ... }");
}
if (info.child == u8) {
switch (actual_fmt[0]) {
's', 'x', 'X', 'e', 'E' => {
comptime checkTextFmt(actual_fmt);
if (actual_fmt[0] == 's' and info.child == u8) {
return formatBuf(&value, options, writer);
},
else => {},
}
}
try writer.writeAll("{ ");
for (value, 0..) |elem, i| {
@ -2205,12 +2168,22 @@ test "buffer" {
}
}
// Test formatting of arrays by value, by single-item pointer, and as a slice
fn expectArrayFmt(expected: []const u8, comptime template: []const u8, comptime array_value: anytype) !void {
try expectFmt(expected, template, .{array_value});
try expectFmt(expected, template, .{&array_value});
var runtime_zero: usize = 0;
_ = &runtime_zero;
try expectFmt(expected, template, .{array_value[runtime_zero..]});
}
test "array" {
{
const value: [3]u8 = "abc".*;
try expectFmt("array: abc\n", "array: {s}\n", .{value});
try expectFmt("array: abc\n", "array: {s}\n", .{&value});
try expectFmt("array: { 97, 98, 99 }\n", "array: {d}\n", .{value});
try expectArrayFmt("array: abc\n", "array: {s}\n", value);
try expectArrayFmt("array: { 97, 98, 99 }\n", "array: {d}\n", value);
try expectArrayFmt("array: { 61, 62, 63 }\n", "array: {x}\n", value);
try expectArrayFmt("array: { 97, 98, 99 }\n", "array: {any}\n", value);
var buf: [100]u8 = undefined;
try expectFmt(
@ -2219,12 +2192,23 @@ test "array" {
.{&value},
);
}
{
const value = [2][3]u8{ "abc".*, "def".* };
try expectArrayFmt("array: { abc, def }\n", "array: {s}\n", value);
try expectArrayFmt("array: { { 97, 98, 99 }, { 100, 101, 102 } }\n", "array: {d}\n", value);
try expectArrayFmt("array: { { 61, 62, 63 }, { 64, 65, 66 } }\n", "array: {x}\n", value);
}
}
test "slice" {
{
const value: []const u8 = "abc";
try expectFmt("slice: abc\n", "slice: {s}\n", .{value});
try expectFmt("slice: { 97, 98, 99 }\n", "slice: {d}\n", .{value});
try expectFmt("slice: { 61, 62, 63 }\n", "slice: {x}\n", .{value});
try expectFmt("slice: { 97, 98, 99 }\n", "slice: {any}\n", .{value});
}
{
var runtime_zero: usize = 0;