Create pre-processor MS BASIC compatibility layer - Githubissues

source-solutions / sebasic4

SE BASIC - A free BASIC interpreter written in Z80 assembly language

GNU General Public License v3.0

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Create pre-processor MS BASIC compatibility layer #98

Closed cheveron closed 2 years ago

cheveron commented 2 years ago

This ticket combines previous tickets #95, #94, #93 and #92.

Before a line is tokenized, it should be parsed and substitutions made in the following cases to convert MS BASIC syntax to SE BASIC syntax:

RND(*) to RND where * is any value.
ELSE to :ELSE.
=> to >=.
=< to <=.
>< to <>.
FNa to FN a where a is an alphabetical character.
THEN n to THEN GOTO n where n is a numerical character.
&h to $.
&o to @.
? to PRINT.
& to AND.
~ to NOT.
| to OR.
!filename to RUN "filename".
[ to (.
] to ).
TRON to TRACE ON.
TROFF to TRACE OFF.
HEX$(n) to STR$(n,16).
OCT$(n) to STR$(n,8).
COLOUR to COLOR.
SPACE$(n) to STRING$(n,32).

cheveron commented 2 years ago

It's done and working, but horribly inefficient. Needs refactoring before merging into the main branch.

cheveron commented 2 years ago

Code clean up complete. Needs relocating from screen 40 section, but is good enough to include.