not used characters from ANSI characters set

I'am developing a small programming language together with an IDE.

The ANSI character set states the subset of unused characters. Here is the complete list: 0x7F, 0x81, 0x8D, 0x8F, 0x90, 0x9D

I'd like to use some of them for an invisible code markup, so am wondering how they got printed in different environments. Can I assume they are always a whitespace, or some editors will take the honor to rep开发者_StackOverflowlace them with something like '?' or grey rectangle?

Thank you, Dmitry

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You seem to be talking about Windows-1252, which is just one of many "ANSI" code pages Windows can use, and it's probably not used outside of Windows. Don't tie a new product to an obsolete technology. Not supporting Unicode (be it UTF-16le or UTF-8) is unacceptable for a programming language.

While it's rather moot to answer the direct question, the answer is no, you cannot assume they will be treated as whitespace. Some may. Some may replace with a space. Some may replace with another glyph. Some may use special colours. Some may give a warning. Some may not load the file.

By the way, if you are referring to Windows-1252, only 0x81, 0x8D, 0x8F, 0x90, 0x9D aren't assigned.

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You shouldn't assume any specific behavior, as it will depend on the display widget and quite possibly on the font. Either preprocess the text for display or use an out-of-band markup mechanism (for example, many text field widgets let you attach attributes to runs of text).