mirror of
https://github.com/blondie7575/WeeGUI.git
synced 2024-06-26 18:29:47 +00:00
ac965177c8
- Improved some AppleSoft error messages - Integer arguments in AppleSoft now handle signed values as well as unsigned - Fixed a bug in string arguments - Added a temp string argument type, whereby the string is pointed to within the AppleSoft source - Added &CURSR - Added &PRINT - Added &SCR - Added &SCRBY - Added &ERASE - Fixed WGPrint not clipping top properly if last line is short and above the plane - Fixed decorated window titles not rendering properly
867 lines
18 KiB
ArmAsm
867 lines
18 KiB
ArmAsm
;
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; applesoft.s
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; Applesoft API via the & extension point
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;
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; Created by Quinn Dunki on 8/15/14.
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; Copyright (c) 2014 One Girl, One Laptop Productions. All rights reserved.
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Applesoft ROM entry points and constants
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;
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LINNUML = $0050 ; Scratch pad for calculating line numbers (LSB)
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LINNUMH = $0051 ; Scratch pad for calculating line numbers (MSB)
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CURLINL = $0075 ; Current line number (LSB)
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CURLINH = $0076 ; Current line number (MSB)
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CHRGET = $00b1 ; Advances text point and gets character in A
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CHRGOT = $00b7 ; Returns character at text pointer in A
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TXTPTRL = $00b8 ; Current location in BASIC listing (LSB)
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TXTPTRH = $00b9 ; Current location in BASIC listing (MSB)
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FAC = $009d ; Floating point accumulator
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AMPVECTOR = $03f5 ; Ampersand entry vector
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ERROR = $d412 ; Reports error in X
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NEWSTT = $d7d2 ; Advance to next Applesoft statement
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GOTO = $d93e ; Entry point of Applesoft GOTO
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LINGET = $da0c ; Read a line number (16-bit integer) into LINNUM
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FRMNUM = $dd67 ; Evaluate an expression as a number and store in FAC
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CHKCOM = $debe ; Validates current character is a ',', then gets it
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SYNCHR = $dec0 ; Validates current character is what's in A
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AYINT = $e10c ; Convert FAC to 8-bit signed integer
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GETBYT = $e6f8 ; Gets an integer at text pointer, stores in X
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GETNUM = $e746 ; Gets an 8-bit, stores it X, skips past a comma
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TOKEN_GOSUB = $b0 ; Applesoft's token for GOSUB
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TOKEN_HOME = $97 ; Applesoft's token for HOME
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TOKEN_PRINT = $ba ; Applesoft's token for PRINT
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TOKEN_MINUS = $c9 ; Applesoft's token for a minus sign
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ERR_UNDEFINEDFUNC = 224
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ERR_SYNTAX = 16
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ERR_ENDOFDATA = 5
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ERR_TOOLONG = 176
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MAXCMDLEN = 6
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGInitApplesoft
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; Sets up Applesoft API
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;
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WGInitApplesoft:
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pha
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lda #$4c ; Patch in our jump vector for &
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sta AMPVECTOR
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lda #<WGAmpersand
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sta AMPVECTOR+1
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lda #>WGAmpersand
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sta AMPVECTOR+2
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand
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; The entry point from Applesoft. Applesoft text pointer
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; will be positioned two after the '&', and accumulator will
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; contain first character after the '&'
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; Side effects: Clobbers S0
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;
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WGAmpersand:
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tsx ; Start by caching a valid stack state to return to Applesoft,
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stx WG_STACKPTR ; in case we need to do so in a hurry
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sta SCRATCH0
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SAVE_AXY
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SAVE_ZPP
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ldy #0
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ldx SCRATCH0
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WGAmpersand_parseLoop:
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txa
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beq WGAmpersand_matchStart ; Check for end-of-statement (CHRGET handles : and EOL)
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cmp #'('
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beq WGAmpersand_matchStart
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sta WGAmpersandCommandBuffer,y
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jsr CHRGET
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tax
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iny
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cpy #MAXCMDLEN+1
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bne WGAmpersand_parseLoop
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WGAmpersand_parseFail:
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ldx #ERR_UNDEFINEDFUNC
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jsr ERROR
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bra WGAmpersand_done
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WGAmpersand_matchStart:
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lda #0
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sta WGAmpersandCommandBuffer,y ; Null terminate the buffer for matching
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ldy #0
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ldx #0 ; Command buffer now contains our API call
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phx ; We stash the current command number on the stack
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WGAmpersand_matchLoop:
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lda WGAmpersandCommandBuffer,y
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beq WGAmpersand_matchPossible
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cmp WGAmpersandCommandTable,x
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bne WGAmpersand_matchNext ; Not this one
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iny
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inx
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bra WGAmpersand_matchLoop
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WGAmpersand_matchPossible:
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lda WGAmpersandCommandTable,x
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beq WGAmpersand_matchFound ; Got one!
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WGAmpersand_matchNext:
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pla ; Advance index to next commmand in table
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inc
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pha
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asl
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asl
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asl
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tax
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cpx #WGAmpersandCommandTableEnd-WGAmpersandCommandTable
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beq WGAmpersand_matchFail ; Hit the end of the table
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ldy #0
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bra WGAmpersand_matchLoop
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WGAmpersand_matchFound:
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pla ; This is now the matching command number
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inc
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asl
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asl
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asl
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tay
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lda WGAmpersandCommandTable-2,y ; Prepare an indirect JSR to our command
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sta WGAmpersand_commandJSR+1 ; Self-modifying code!
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lda WGAmpersandCommandTable-1,y
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sta WGAmpersand_commandJSR+2
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; Self-modifying code!
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WGAmpersand_commandJSR:
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jsr WGAmpersand_done ; Address here overwritten with command
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bra WGAmpersand_done
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WGAmpersand_matchFail:
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pla ; We left command number on the stack while matching
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ldx #ERR_UNDEFINEDFUNC
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jsr ERROR
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WGAmpersand_done:
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RESTORE_ZPP
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandBeginArguments
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; Begins reading an ampersand argument list
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; Side effects: Clobbers all registers
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WGAmpersandBeginArguments:
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pha
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lda #'('
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jsr SYNCHR ; Expect opening parenthesis
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandNextArgument
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; Prepares for the next argument in the list
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; Side effects: Clobbers all registers
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WGAmpersandNextArgument:
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jsr CHRGOT
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jsr CHKCOM ; Verify parameter separator
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandEndArguments
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; Finishes reading an ampersand argument list
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; Side effects: Clobbers all registers
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WGAmpersandEndArguments:
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pha
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lda #')'
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jsr SYNCHR ; Expect closing parenthesis
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandIntArgument
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; Reads an integer argument for the current command
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; OUT A : The argument
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; Side effects: Clobbers all registers
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WGAmpersandIntArgument:
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jsr CHRGOT
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cmp #TOKEN_MINUS
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beq WGAmpersandIntArgument_signed
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jsr GETBYT
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txa
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rts
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WGAmpersandIntArgument_signed:
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jsr CHRGET
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jsr GETBYT
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txa
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eor #$ff
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inc
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandAddrArgument
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; Reads a 16-bit pointer (or integer) argument for the current command
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; OUT X : The argument (LSB)
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; OUT Y : The argument (MSB)
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; Side effects: Clobbers all registers
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WGAmpersandAddrArgument:
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jsr CHRGOT
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jsr LINGET
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ldx LINNUML
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ldy LINNUMH
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandStrArgument
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; Reads a string argument for the current command in PARAM0/1.
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; This string is copied into privately allocated memory.
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; OUT X : Pointer to a stored copy of the string (LSB)
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; OUT Y : Pointer to a stored copy of the string (MSB)
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; Side effects: Clobbers P0/P1 and all registers
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WGAmpersandStrArgument:
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lda #'"'
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jsr SYNCHR ; Expect opening quote
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lda TXTPTRL ; Allocate for, and copy the string at TXTPTR
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sta PARAM0
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lda TXTPTRH
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sta PARAM1
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lda #'"' ; Specify quote as our terminator
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jsr WGStoreStr
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WGAmpersandStrArgument_loop:
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jsr CHRGET ; Consume the string for Applesoft
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beq WGAmpersandStrArgument_done
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cmp #'"' ; Check for closing quote
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bne WGAmpersandStrArgument_loop
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WGAmpersandStrArgument_done:
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lda #'"'
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jsr SYNCHR ; Expect closing quote
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ldx PARAM0
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ldy PARAM1
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersandTempStrArgument
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; Reads a string argument for the current command in PARAM0/1.
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; This string is pointed to IN PLACE, and NOT copied.
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; OUT X : Pointer to a stored copy of the string (LSB)
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; OUT Y : Pointer to a stored copy of the string (MSB)
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; OUT A : String length
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; Side effects: Clobbers P0/P1 and all registers
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WGAmpersandTempStrArgument:
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lda #'"'
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jsr SYNCHR ; Expect opening quote
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lda TXTPTRL ; Grab current TXTPTR
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sta PARAM0
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lda TXTPTRH
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sta PARAM1
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WGAmpersandTempStrArgument_loop:
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jsr CHRGET ; Consume the string for Applesoft
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beq WGAmpersandTempStrArgument_done
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cmp #'"' ; Check for closing quote
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bne WGAmpersandTempStrArgument_loop
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WGAmpersandTempStrArgument_done:
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lda #'"'
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jsr SYNCHR ; Expect closing quote
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; Compute the 8-bit distance TXTPTR moved. Note that we can't simply
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; count in the above loop, because CHRGET will skip ahead unpredictable
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; amounts
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sec
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lda TXTPTRL
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sbc PARAM0
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dec
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ldx PARAM0 ; Return results
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ldy PARAM1
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; pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Ampersand API entry points
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_HOME
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; Clears the screen
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; &HOME
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WGAmpersand_HOME:
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jsr WGClearScreen
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_DESK
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; Render the desktop
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; &DESK
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WGAmpersand_DESK:
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jsr WGDesktop
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_WINDW
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; Create a view
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; &WINDW(id,style,x,y,width,height,canvas width,canvas height)
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WGAmpersand_WINDW:
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jsr WGAmpersandBeginArguments
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+0
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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ora #VIEW_STYLE_APPLESOFT ; Flag this as an Applesoft-created view
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sta WGAmpersandCommandBuffer+1
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+2
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+3
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+4
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+5
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+6
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+7
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jsr WGAmpersandEndArguments
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CALL16 WGCreateView,WGAmpersandCommandBuffer
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jsr WGEraseView
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jsr WGPaintView
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_CHKBX
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; Create a checkbox
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; &CHKBX(id,x,y,"title")
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WGAmpersand_CHKBX:
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jsr WGAmpersandBeginArguments
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+0
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+1
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+2
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jsr WGAmpersandNextArgument
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jsr WGAmpersandStrArgument
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stx WGAmpersandCommandBuffer+3
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sty WGAmpersandCommandBuffer+4
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jsr WGAmpersandEndArguments
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CALL16 WGCreateCheckbox,WGAmpersandCommandBuffer
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LDY_ACTIVEVIEW ; Flag this as an Applesoft-created view
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lda #VIEW_STYLE_APPLESOFT
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ora WG_VIEWRECORDS+4,y
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sta WG_VIEWRECORDS+4,y
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jsr WGPaintView
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_BUTTN
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; Create a button
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; &BUTTN(id,x,y,width,lineNum,"title")
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WGAmpersand_BUTTN:
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jsr WGAmpersandBeginArguments
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+0
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+1
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+2
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jsr WGAmpersandNextArgument
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jsr WGAmpersandIntArgument
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sta WGAmpersandCommandBuffer+3
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jsr WGAmpersandNextArgument
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jsr WGAmpersandAddrArgument
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stx WGAmpersandCommandBuffer+4
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sty WGAmpersandCommandBuffer+5
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jsr WGAmpersandNextArgument
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jsr WGAmpersandStrArgument
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stx WGAmpersandCommandBuffer+6
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sty WGAmpersandCommandBuffer+7
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jsr WGAmpersandEndArguments
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CALL16 WGCreateButton,WGAmpersandCommandBuffer
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LDY_ACTIVEVIEW ; Flag this as an Applesoft-created view
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lda #VIEW_STYLE_APPLESOFT
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ora WG_VIEWRECORDS+4,y
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sta WG_VIEWRECORDS+4,y
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jsr WGPaintView
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_SEL
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; Select a view
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; &SEL(id)
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WGAmpersand_SEL:
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jsr WGAmpersandBeginArguments
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jsr WGAmpersandIntArgument
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jsr WGSelectView
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jsr WGAmpersandEndArguments
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_FOC
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; Focuses selected view
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; &FOC
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WGAmpersand_FOC:
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jsr WGViewFocus
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_FOCN
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; Focuses next view
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; &FOCN
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WGAmpersand_FOCN:
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jsr WGViewFocusNext
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_FOCP
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; Focuses previous view
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; &FOCP
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WGAmpersand_FOCP:
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jsr WGViewFocusPrev
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jsr WGBottomCursor
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_ACT
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; Takes action on focused view
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; &ACT
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WGAmpersand_ACT:
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jsr WGViewFocusAction
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jsr WGBottomCursor
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bvs WGAmpersand_ACTGosub
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rts
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WGAmpersand_ACTGosub:
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jmp WGGosub ; No coming back from an Applesoft GOSUB!
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; WGAmpersand_STACT
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; Sets the callback for the selected view
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; &STACT(lineNum)
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WGAmpersand_STACT:
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jsr WGAmpersandBeginArguments
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jsr WGAmpersandAddrArgument
|
|
stx PARAM0
|
|
sty PARAM1
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
jsr WGViewSetAction
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_TITLE
|
|
; Sets the title for the selected view
|
|
; &TITLE("title")
|
|
WGAmpersand_TITLE:
|
|
jsr WGAmpersandBeginArguments
|
|
|
|
jsr WGAmpersandStrArgument
|
|
stx PARAM0
|
|
sty PARAM1
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
jsr WGViewSetTitle
|
|
jsr WGPaintView
|
|
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_CURSR
|
|
; Sets the cursor position in selected viewspace
|
|
; &CURSR(x,y)
|
|
WGAmpersand_CURSR:
|
|
jsr WGAmpersandBeginArguments
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
jsr WGAmpersandNextArgument
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
ply
|
|
plx
|
|
|
|
jsr WGSetCursor
|
|
|
|
rts
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_PRINT
|
|
; Prints a string in the selected view at the local cursor
|
|
; &PRINT("string")
|
|
WGAmpersand_PRINT:
|
|
jsr WGAmpersandBeginArguments
|
|
|
|
jsr WGAmpersandTempStrArgument
|
|
stx PARAM0
|
|
sty PARAM1
|
|
pha
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
; We're pointing to the string directly in the Applesoft
|
|
; source, so we need to NULL-terminate it for printing. In
|
|
; order to avoid copying the whole thing, we'll do something
|
|
; kinda dirty here.
|
|
pla
|
|
tay
|
|
lda (PARAM0),y ; Cache the byte at the end of the string
|
|
pha
|
|
|
|
lda #0
|
|
sta (PARAM0),y ; Null-terminate the string in-place
|
|
|
|
jsr WGPrint
|
|
|
|
pla
|
|
sta (PARAM0),y ; Put original byte back
|
|
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_SCR
|
|
; Sets scroll position of selected view
|
|
; &SCR(x,y)
|
|
WGAmpersand_SCR:
|
|
jsr WGAmpersandBeginArguments
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
jsr WGAmpersandNextArgument
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
pla
|
|
jsr WGScrollY
|
|
pla
|
|
jsr WGScrollX
|
|
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_SCRBY
|
|
; Adjusts scroll position of selected view by a delta
|
|
; &SCRBY(x,y)
|
|
WGAmpersand_SCRBY:
|
|
jsr WGAmpersandBeginArguments
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
jsr WGAmpersandNextArgument
|
|
|
|
jsr WGAmpersandIntArgument
|
|
pha
|
|
|
|
jsr WGAmpersandEndArguments
|
|
|
|
pla
|
|
jsr WGScrollYBy
|
|
pla
|
|
jsr WGScrollXBy
|
|
|
|
rts
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_GOSUB
|
|
; A custom gosub, because we can. Only for testing at the moment
|
|
; &GOSUB
|
|
WGAmpersand_GOSUB:
|
|
lda #$e8
|
|
sta PARAM0
|
|
lda #$03
|
|
sta PARAM1
|
|
jmp WGGosub
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGAmpersand_ERASE
|
|
; Erases the contents of the selected view
|
|
; &ERASE
|
|
WGAmpersand_ERASE:
|
|
jsr WGEraseViewContents
|
|
jsr WGBottomCursor
|
|
rts
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGBottomCursor
|
|
; Leave the cursor state in a place that Applesoft is happy with
|
|
;
|
|
WGBottomCursor:
|
|
SAVE_AY
|
|
|
|
lda #0
|
|
sta CH
|
|
sta OURCH
|
|
lda #23
|
|
sta CV
|
|
sta OURCV
|
|
|
|
lda TEXTLINES_H+23
|
|
sta BASH
|
|
lda TEXTLINES_L+23
|
|
sta BASL
|
|
|
|
RESTORE_AY
|
|
rts
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; WGGosub
|
|
; Performs an Applesoft GOSUB to a line number
|
|
; PARAM0: Line number (LSB)
|
|
; PARAM1: Line number (MSB)
|
|
;
|
|
WGGosub:
|
|
; Can't come back from what we're about to do, so cleanup from the
|
|
; original Ampersand entry point now! This is some seriously voodoo
|
|
; shit we're gonna pull here.
|
|
ldx WG_STACKPTR
|
|
txs
|
|
|
|
; Fake an Applesoft GOSUB by pushing the same stuff it would do
|
|
lda TXTPTRH
|
|
pha
|
|
lda TXTPTRL
|
|
pha
|
|
lda CURLINH
|
|
pha
|
|
lda CURLINL
|
|
pha
|
|
lda #TOKEN_GOSUB
|
|
pha
|
|
|
|
; Here's the tricky bit- we jump into Applesoft's GOTO
|
|
; just after the part where it reads the line number. This
|
|
; allows us to piggy back on the hard work of finding the
|
|
; line number in the Applesoft source code, and storing
|
|
; it in the TXTPTR (thus performing the jump portion of
|
|
; a GOSUB). Since GOSUB normally falls through into GOTO,
|
|
; by faking the setup portion of the GOSUB, then leaving
|
|
; the state as GOTO expects it, we can fake the entire
|
|
; process to GOSUB to a line number we specify
|
|
lda PARAM0
|
|
sta LINNUML
|
|
lda PARAM1
|
|
sta LINNUMH
|
|
|
|
jsr GOTO+3
|
|
|
|
; The goto has pointed the interpreter at the subroutine,
|
|
; so now advance to the next statement to continue executing.
|
|
; We'll never regain control, which is why we had to clean
|
|
; up from the ampersand entry before we got here.
|
|
jmp NEWSTT
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; Applesoft API state
|
|
;
|
|
|
|
WGAmpersandCommandBuffer:
|
|
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
WGAmpersandCommandBufferEnd:
|
|
.byte 0 ; Make sure this last byte is always kept as a terminator
|
|
|
|
WG_STACKPTR: ; A place to save the stack pointer for tricky Applesoft manipulation
|
|
.byte 0
|
|
|
|
|
|
; Jump table for ampersand commands.
|
|
; Each row is 8 bytes (5 for name, NULL terminator, 2 for address)
|
|
;
|
|
; Note the strange byte values amidst some strings- this is because
|
|
; all text is tokenized before we receive it, so reserved words may
|
|
; be compressed
|
|
;
|
|
WGAmpersandCommandTable:
|
|
|
|
.byte TOKEN_HOME,0,0,0,0,0
|
|
.addr WGAmpersand_HOME
|
|
|
|
.byte "DESK",0,0
|
|
.addr WGAmpersand_DESK
|
|
|
|
.byte "WINDW",0
|
|
.addr WGAmpersand_WINDW
|
|
|
|
.byte "CHKBX",0
|
|
.addr WGAmpersand_CHKBX
|
|
|
|
.byte "BUTTN",0
|
|
.addr WGAmpersand_BUTTN
|
|
|
|
.byte "SEL",0,0,0
|
|
.addr WGAmpersand_SEL
|
|
|
|
.byte "FOC",0,0,0
|
|
.addr WGAmpersand_FOC
|
|
|
|
.byte "FOCN",0,0
|
|
.addr WGAmpersand_FOCN
|
|
|
|
.byte "FOCP",0,0
|
|
.addr WGAmpersand_FOCP
|
|
|
|
.byte "ACT",0,0,0
|
|
.addr WGAmpersand_ACT
|
|
|
|
.byte "STACT",0
|
|
.addr WGAmpersand_STACT
|
|
|
|
.byte "TITLE",0
|
|
.addr WGAmpersand_TITLE
|
|
|
|
.byte "CURSR",0
|
|
.addr WGAmpersand_CURSR
|
|
|
|
.byte "SCR",0,0,0
|
|
.addr WGAmpersand_SCR
|
|
|
|
.byte "SCRBY",0
|
|
.addr WGAmpersand_SCRBY
|
|
|
|
.byte "ERASE",0
|
|
.addr WGAmpersand_ERASE
|
|
|
|
.byte TOKEN_PRINT,0,0,0,0,0
|
|
.addr WGAmpersand_PRINT
|
|
|
|
;.byte TOKEN_GOSUB,0,0,0,0,0,0,0,0,0,0,0,0,0 ; For internal testing of the procedural gosub
|
|
;.addr WGAmpersand_GOSUB
|
|
|
|
|
|
WGAmpersandCommandTableEnd:
|
|
|