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basic: add ldbas command

This commit is contained in:
Virgil Dupras 2019-11-24 14:26:32 -05:00
parent 13f935aa88
commit e1df320d44
6 changed files with 80 additions and 12 deletions

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@ -82,15 +82,17 @@ are initialized to zero on launch.
There are two types of commands: normal and direct-only. The latter can only
be invoked in direct mode, not through a code listing.
**bye**. Direct-only. Quits BASIC
**bye**: Direct-only. Quits BASIC
**list**. Direct-only. Prints all lines in the code listing, prefixing them
**list**: Direct-only. Prints all lines in the code listing, prefixing them
with their associated line number.
**run**. Direct-only. Runs code from the listing, starting with the first one.
**run**: Direct-only. Runs code from the listing, starting with the first one.
If `goto` was previously called in direct mode, we start from that line instead.
**print**. Prints the result of the specified expression, then CR/LF. Can be
**clear**: Direct-only. Clears the current code listing.
**print**: Prints the result of the specified expression, then CR/LF. Can be
given multiple arguments. In that case, all arguments are printed separately
with a space in between. For example, `print 12 13` prints `12 13<cr><lf>`
@ -98,16 +100,16 @@ Unlike anywhere else, the `print` command can take a string inside a double
quote. That string will be printed as-is. For example, `print "foo" 40+2` will
print `foo 42`.
**goto**. Make the next line to be executed the line number specified as an
**goto**: Make the next line to be executed the line number specified as an
argument. Errors out if line doesn't exist. Argument can be an expression. If
invoked in direct mode, `run` must be called to actually run the line (followed
by the next, and so on).
**if**. If specified condition is true, execute the rest of the line. Otherwise,
**if**: If specified condition is true, execute the rest of the line. Otherwise,
do nothing. For example, `if 2>1 print 12` prints `12` and `if 2<1 print 12`
does nothing. The argument for this command is a "thruth expression".
**input**. Prompts the user for a numerical value and puts that value in the
**input**: Prompts the user for a numerical value and puts that value in the
specified variable. The prompted value is evaluated as an expression and then
stored where specified. For example, `input x` stores the result of the
evaluation in variable `x`. Before the variable name, a quoted string literal
@ -144,3 +146,7 @@ Here's the documentation for them.
`fs.asm` provides those commands:
**fls**: prints the list of files contained in the active filesystem.
**ldbas**: loads the content of the file specified in the argument (as an
unquoted filename) and replace the current code listing with this contents. Any
line not starting with a number is ignored (not an error).

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@ -22,6 +22,7 @@ bufInit:
ld (BUF_LFREE), hl
ld hl, BUF_POOL
ld (BUF_PFREE), hl
cp a ; ensure Z
ret
; Add line at (HL) with line number DE to the buffer. The string at (HL) should

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@ -1,4 +1,8 @@
; FS-related basic commands
; *** Variables ***
; Handle of the target file
.equ BFS_FILE_HDL BFS_RAMSTART
.equ BFS_RAMEND @+FS_HANDLE_SIZE
basFLS:
ld iy, .iter
@ -9,7 +13,57 @@ basFLS:
call printstr
jp printcrlf
basLDBAS:
call fsFindFN
ret nz
call bufInit
ld ix, BFS_FILE_HDL
call fsOpen
ld hl, 0
ld de, SCRATCHPAD
.loop:
ld ix, BFS_FILE_HDL
call fsGetB
jr nz, .loopend
inc hl
or a ; null? hum, weird. same as LF
jr z, .lineend
cp LF
jr z, .lineend
ld (de), a
inc de
jr .loop
.lineend:
; We've just finished reading a line, writing each char in the pad.
; Null terminate it.
xor a
ld (de), a
; Ok, line ready
push hl ; --> lvl 1. current file position
ld hl, SCRATCHPAD
call parseDecimal
jr nz, .notANumber
push ix \ pop de
call toSep
call rdSep
call bufAdd
pop hl ; <-- lvl 1
ret nz
ld de, SCRATCHPAD
jr .loop
.notANumber:
pop hl ; <-- lvl 1
ld de, SCRATCHPAD
jr .loop
.loopend:
cp a
ret
basFSCmds:
.dw basFLS
.db "fls", 0, 0, 0
.dw basLDBAS
.db "ldbas", 0
.db 0xff, 0xff, 0xff ; end of table

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@ -139,7 +139,7 @@ basBYE:
basLIST:
call bufFirst
ret nz
jr nz, .end
.loop:
ld e, (ix)
ld d, (ix+1)
@ -153,6 +153,7 @@ basLIST:
call printcrlf
call bufNext
jr z, .loop
.end:
cp a ; ensure Z
ret
@ -383,6 +384,8 @@ basCmds1:
.db "list", 0, 0
.dw basRUN
.db "run", 0, 0, 0
.dw bufInit
.db "clear", 0
; statements
basCmds2:
.dw basPRINT

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@ -84,11 +84,10 @@
.inc "basic/var.asm"
.equ BUF_RAMSTART VAR_RAMEND
.inc "basic/buf.asm"
.equ BAS_RAMSTART BUF_RAMEND
.inc "basic/main.asm"
; Extra cmds
.equ BFS_RAMSTART BUF_RAMEND
.inc "basic/fs.asm"
.equ BAS_RAMSTART BFS_RAMEND
.inc "basic/main.asm"
init:
di

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@ -0,0 +1,5 @@
10 print "Count to 10"
20 a=0
30 a=a+1
40 print a
50 if a<10 goto 30