15 Commits

Author	SHA1	Message	Date
Virgil Dupras	7ca54d179d	lib/expr: make EXPR_PARSE "tail" HL ... Things are now much simpler.	2019-12-30 19:24:53 -05:00
Virgil Dupras	15628da7de	lib/expr: make EXPR_PARSE put result in DE instead of IX ... Finally getting rid of this bad mistake of using IX for this.	2019-12-29 17:37:04 -05:00
Virgil Dupras	981c93bfd4	lib/expr: fix stack imbalance on failure	2019-12-29 16:15:48 -05:00
Virgil Dupras	213614af33	lib/expr: make recursion process a bit more orderly ... Instead of going left and right, finding operators chars and replacing them with nulls, we parse expressions in a more orderly manner, one chunk at a time. I think it qualifies as "recursive descent", but I'm not sure. This allows us to preserve the string we parse and should also make the implementation of parens much easier.	2019-12-29 11:42:18 -05:00
Virgil Dupras	7410891ad1	lib/expr: fix unary minus ... For some reason, I've mistakenly disabled tests in test_expr without noticing and I also broke "-123" parsing. Fixed.	2019-12-23 20:53:31 -05:00
Virgil Dupras	6d88c3a754	parseExprDE --> parseExpr	2019-12-23 19:13:44 -05:00
Virgil Dupras	a034f63e23	test: begin adding common test harnessing code ... This should make tests a bit more convenient to write and debug. Moreover, begin de de-IX-ization of parseExpr. I have, in a local WIP, a parseExpr implemented using a recursive descent algo, it passes all tests, but it unfortunately assembles a faulty zasm. I have to find the expressions that it doesn't parse properly. But before I do that, I prefer to commit these significant improvements I've been making to tests harness in parallel of this development.	2019-12-23 15:41:25 -05:00
Virgil Dupras	a680fd3328	basic: add support for signed integers	2019-11-23 14:56:23 -05:00
Virgil Dupras	501fe96e07	lib/expr: use the IX register a bit less ... It's an awkward register to use and avoiding its use allows us to strip the resulting binary significantly. parseEXPR keeps the same signature though.	2019-11-22 19:56:08 -05:00
Virgil Dupras	2f71ad6d2f	lib/expr: add left/right shifting operators	2019-11-22 18:35:10 -05:00
Virgil Dupras	a03c5ac700	lib/expr: add bitwise operators	2019-11-22 17:16:51 -05:00
Virgil Dupras	972e8221f1	lib/expr: add division and modulo operators	2019-11-22 15:03:16 -05:00
Virgil Dupras	1b01f13105	lib/expr: refactor for easier operator addition	2019-11-22 14:45:12 -05:00
Virgil Dupras	7262993f14	basic: add if	2019-11-21 16:06:14 -05:00
Virgil Dupras	f5b04fc02f	basic: add expression support to print ... Again, same thing as in zasm.	2019-11-18 15:52:44 -05:00