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js-runtime: Implement `fn format()` for js.Value for easier debugging

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iddev5 2022-07-08 23:26:09 +05:30 • committed by Stephen Gutekanst
parent 852278ebe7
commit b74cfa838e
1 changed files with 15 additions and 0 deletions
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15
js-runtime/src/main.zig
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@ -80,6 +80,21 @@ pub const Value = extern struct {
pub fn instanceOf(val: *const Value, other: Value) bool {
return js.zigValueInstanceOf(val, &other);
}
pub fn format(val: *const Value, comptime _: []const u8, _: std.fmt.FormatOptions, writer: anytype) !void {
switch (val.tag) {
.object => try writer.print("Object@{}({})", .{ val.val.ref, val.view(.object).attributeCount() }),
.num => if (val.val.num > 10000)
try writer.print("{e}", .{val.val.num})
else
try writer.print("{d}", .{val.val.num}),
.bool => try writer.writeAll(if (val.view(.bool)) "true" else "false"),
.str => try writer.print("String@{}({})", .{ val.val.ref, val.view(.str).getLength() }),
.func => try writer.print("Function@{}({})", .{ val.val.ref, val.view(.func).paramCount() }),
.nulled => try writer.writeAll("null"),
.undef => try writer.writeAll("undefined"),
}
}
};
pub const Object = struct {