renderIdentifierContents

fn renderIdentifierContents(ais: *AutoIndentingStream, bytes: []const u8) !void {
    var pos: usize = 0;
    while (pos < bytes.len) {
        const byte = bytes[pos];
        switch (byte) {
            '\\' => {
                const old_pos = pos;
                const res = std.zig.string_literal.parseEscapeSequence(bytes, &pos);
                const escape_sequence = bytes[old_pos..pos];
                switch (res) {
                    .success => |codepoint| {
                        if (codepoint <= 0x7f) {
                            const buf = [1]u8{@as(u8, @intCast(codepoint))};
                            try ais.print("{f}", .{std.zig.fmtString(&buf)});
                        } else {
                            try ais.writeAll(escape_sequence);
                        }
                    },
                    .failure => {
                        // Escape the stray backslash
                        // This also avoids cases like "\x3\x39" becoming "\x39"
                        try ais.writeByte('\\');
                        try ais.writeAll(escape_sequence);
                    },
                }
            },
            0x00...('\\' - 1), ('\\' + 1)...0x7f => {
                const buf = [1]u8{byte};
                try ais.print("{f}", .{std.zig.fmtString(&buf)});
                pos += 1;
            },
            0x80...0xff => {
                try ais.writeByte(byte);
                pos += 1;
            },
        }
    }
}