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basic: allow multiple args in print
This commit is contained in:
Virgil Dupras
parent
9c400ca642
commit
3f3dd9141e
@ -9,6 +9,10 @@
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jp basStart
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; RAM space used in different routines for short term processing.
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.equ SCRATCHPAD_SIZE 0x20
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.equ SCRATCHPAD USER_RAMSTART
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.inc "core.asm"
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.inc "lib/util.asm"
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.inc "lib/ari.asm"
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@ -17,7 +21,7 @@
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.equ EXPR_PARSE parseLiteralOrVar
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.inc "lib/expr.asm"
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.inc "basic/tok.asm"
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.equ VAR_RAMSTART USER_RAMSTART
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.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
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.inc "basic/var.asm"
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.equ BUF_RAMSTART VAR_RAMEND
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.inc "basic/buf.asm"
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@ -1,5 +1,3 @@
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; *** Constants ***
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.equ BAS_SCRATCHPAD_SIZE 0x20
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; *** Variables ***
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; Value of `SP` when basic was first invoked. This is where SP is going back to
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; on restarts.
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@ -9,8 +7,7 @@
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; Important note: this is **not** a line number, it's a pointer to a line index
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; in buffer. If it's not zero, its a valid pointer.
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.equ BAS_PNEXTLN @+2
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.equ BAS_SCRATCHPAD @+2
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.equ BAS_RAMEND @+BAS_SCRATCHPAD_SIZE
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.equ BAS_RAMEND @+2
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; *** Code ***
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basStart:
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@ -18,11 +15,11 @@ basStart:
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call varInit
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call bufInit
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xor a
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ld (BAS_PNEXTLN), a
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ld (BAS_PNEXTLN+1), a
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ld hl, .welcome
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call printstr
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call printcrlf
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ld hl, 0 ; points to a zero word
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ld (BAS_PNEXTLN), hl
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jr basLoop
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.welcome:
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@ -43,8 +40,8 @@ basLoop:
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jr basLoop
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.number:
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push ix \ pop de
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call toWS
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call rdWS
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call toSep
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call rdSep
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call bufAdd
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jp nz, basERR
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jr basLoop
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@ -55,16 +52,7 @@ basLoop:
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; If found, jump to it. If not found, unset Z. We expect commands to set Z
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; on success. Therefore, when calling basCallCmd results in NZ, we're not sure
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; where the error come from, but well...
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; Before being evaluated, (HL) is copied in BAS_SCRATCHPAD because some
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; evaluation routines (such as parseExpr) mutate the string it evaluates.
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; TODO: straighten this situation up. Mutating a string like this breaks
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; expectations.
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basCallCmd:
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push de ; --> lvl 1
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ld de, BAS_SCRATCHPAD
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call strcpy
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ex de, hl ; HL now points to scratchpad
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pop de ; <-- lvl 1
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; let's see if it's a variable assignment.
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call varTryAssign
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ret z ; Done!
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@ -95,17 +83,13 @@ basCallCmd:
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ex de, hl
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ld a, b ; cmd's length
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call addHL
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call rdWS
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call rdSep
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jp (ix)
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basPrintLn:
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call printstr
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jp printcrlf
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basERR:
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ld hl, .sErr
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jr basPrintLn
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call printstr
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jp printcrlf
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.sErr:
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.db "ERR", 0
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@ -118,7 +102,8 @@ basERR:
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; Commands are expected to set Z on success.
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basBYE:
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ld hl, .sBye
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call basPrintLn
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call printstr
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call printcrlf
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; To quit the loop, let's return the stack to its initial value and
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; then return.
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xor a
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@ -133,7 +118,7 @@ basLIST:
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.loop:
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ld e, (ix)
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ld d, (ix+1)
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ld hl, BAS_SCRATCHPAD
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ld hl, SCRATCHPAD
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call fmtDecimal
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call printstr
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ld a, ' '
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@ -169,7 +154,7 @@ basRUN:
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; Print line number, then return NZ (which will print ERR)
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ld e, (ix)
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ld d, (ix+1)
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ld hl, BAS_SCRATCHPAD
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ld hl, SCRATCHPAD
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call fmtDecimal
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call printstr
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ld a, ' '
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@ -191,15 +176,33 @@ basRUN:
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ret
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basPRINT:
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ld de, SCRATCHPAD
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call rdWord
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push hl ; --> lvl 1
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ex de, hl
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call parseExpr
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ret nz
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push ix \ pop de
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ld hl, BAS_SCRATCHPAD
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ld hl, SCRATCHPAD
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call fmtDecimal
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call printstr
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pop hl ; <-- lvl 1
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; Do we have another arg?
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call rdSep
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jr z, .another
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; no, we can stop here
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cp a ; ensure Z
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jp basPrintLn
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jp printcrlf
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.another:
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; Before we jump to basPRINT, let's print a space
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ld a, ' '
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call stdioPutC
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jr basPRINT
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basGOTO:
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ld de, SCRATCHPAD
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call rdWord
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ex de, hl
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call parseExpr
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ret nz
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push ix \ pop de
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@ -1,3 +1,12 @@
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; Sets Z is A is ' ' or '\t' (whitespace), or ',' (arg sep)
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isSep:
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cp ' '
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ret z
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cp 0x09
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ret z
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cp ','
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ret
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; Expect at least one whitespace (0x20, 0x09) at (HL), and then advance HL
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; until a non-whitespace character is met.
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; HL is advanced to the first non-whitespace char.
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@ -5,7 +14,7 @@
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; Failure is either not having a first whitespace or reaching the end of the
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; string.
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; Sets Z if we found a non-whitespace char, unset if we found the end of string.
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rdWS:
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rdSep:
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ld a, (hl)
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call isSep
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ret nz ; failure
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@ -47,10 +56,32 @@ fnWSIdx:
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pop hl
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ret
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; Advance HL to the next whitespace or to the end of string.
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toWS:
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; Advance HL to the next separator or to the end of string.
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toSep:
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ld a, (hl)
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call isSep
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ret z
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inc hl
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jr toWS
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jr toSep
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; Read (HL) until the next separator and copy it in (DE)
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; DE is preserved, but HL is advanced to the end of the read word.
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rdWord:
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push af
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push de
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.loop:
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ld a, (hl)
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call isSep
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jr z, .stop
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or a
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jr z, .stop
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ld (de), a
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inc hl
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inc de
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jr .loop
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.stop:
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xor a
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ld (de), a
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pop de
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pop af
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ret
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@ -44,29 +44,33 @@ varTryAssign:
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; We have a variable! Its table index is currently in A.
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push ix ; --> lvl 1
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push hl ; --> lvl 2
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push af ; --> lvl 3. save for later
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; Let's start by evaluating that expression
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push de ; --> lvl 3
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push af ; --> lvl 4. save for later
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; Let's put that expression to read in scratchpad
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inc hl \ inc hl
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ld de, SCRATCHPAD
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call rdWord
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ex de, hl
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; Now, evaluate that expression now in (HL)
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call parseExpr ; --> number in IX
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jr nz, .exprErr
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pop af ; <-- lvl 3
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pop af ; <-- lvl 4
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add a, a ; * 2 because each element is a word
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ld hl, VAR_TBL
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call addHL
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; HL placed, write number
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push de ; --> lvl 3
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push ix \ pop de
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ld (hl), e
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inc hl
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ld (hl), d
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pop de ; <-- lvl 3
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xor a ; ensure Z
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.end:
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pop de ; <-- lvl 3
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pop hl ; <-- lvl 2
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pop ix ; <-- lvl 1
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ret
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.exprErr:
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pop af ; <-- lvl 3
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pop af ; <-- lvl 4
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jr .end
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; Check if value at (HL) is a variable. If yes, returns its associated value.
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@ -132,7 +132,7 @@ parseDecimal:
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pop hl
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ret z
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; A is not 0? Ok, but if it's a space, we're happy too.
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jp isSep
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jp isWS
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.error:
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pop hl
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jp unsetZ
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@ -1,5 +1,5 @@
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; Sets Z is A is ' ' or '\t'
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isSep:
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; Sets Z is A is ' ' or '\t' (whitespace)
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isWS:
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cp ' '
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ret z
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cp 0x09
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@ -31,7 +31,7 @@ isLineEnd:
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; Sets Z is A is ' ', ',', ';', CR, LF, or null.
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isSepOrLineEnd:
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call isSep
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call isWS
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ret z
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jr isLineEndOrComment
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@ -68,7 +68,7 @@ isLabel:
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; read char in A
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_eatWhitespace:
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call ioGetB
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call isSep
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call isWS
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ret nz
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jr _eatWhitespace
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