Re: Applesoft tokenization phases?

awanderin <>
Mon, 16 Mar 2020 00:07:19 -0600

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Related articles
Applesoft tokenization phases? (Ev. Drikos) (2020-03-12)
Re: Applesoft tokenization phases? (George Neuner) (2020-03-13)
Re: Applesoft tokenization phases? (awanderin) (2020-03-16)
Re: Applesoft tokenization phases? (Ev. Drikos) (2020-03-18)
Re: Applesoft tokenization phases? (Christopher F Clark) (2020-03-20)
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From: awanderin <>
Newsgroups: comp.compilers
Date: Mon, 16 Mar 2020 00:07:19 -0600
Organization: A noiseless patient Spider
References: 20-03-013
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Keywords: Basic, history
Posted-Date: 16 Mar 2020 20:51:08 EDT

"Ev. Drikos" <> writes:
> This question relates to thread "Languages with Optional Spaces".
> In an Applesoft II manual I've found at "" [1], page 7,
> we read that in a variable name any alphanumeric characters after the
> first two are ignored, unless they contain a reserved world. FEND ie
> would be illegal as it contains END.
> To implement such a rule one could first recognize keywords and then
> recognize any names. We see in p123 that stmt I is tokenized as II:
> I. stmt: 100 FOR A = LOFT OR CAT To 15
> II. tokens: 100 FOR A = LOF TO RC AT To 15
> Yet, I've found ie a program at "" [2] that contains:
> 110 DIFF = ABS(A(I)-N)

If you type that into Applesoft BASIC, it parses it as:

      110 D IF F = ABS (A(I) - N)

The spaces are how Applesoft lists it (it puts spaces around each token;
variables are not parsed as tokens at entry time, they are only parsed
at run-time).

> Also, an online AppleSoft simulator at [3] accepts ie both
> DIFF and FEND as valid variable names.

It is doing things differently than actual Applesoft.

> As it seems, this issue can affect a design choice for the tokenization
> phases of an Applesoft front-end. Is the manual just informative or the
> online simulator does not accept (precisely) the particular dialect?

The latter; the simulator accepts a different dialect.

Jerry awanderin at gmail dot com

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