128 lines
3.9 KiB
Plaintext
128 lines
3.9 KiB
Plaintext
;license:MIT
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;(c) 2018 by 4am
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;
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; Common functions across parsers
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;
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; Public functions:
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; - ParseKeyValueText
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; - IncAndGetChar
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;
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;------------------------------------------------------------------------------
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; ParseKeyValueText
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; parse buffer with KEY=VALUE lines of text into an okvs
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; keys and values limited to 127 characters, which should be enough for anyone
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;
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; in: stack contains 5 bytes of parameters:
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; +1 [word] handle to storage space
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; +3 [word] handle to data buffer
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; +5 [byte] max length for okvs records (or 0)
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; out: all registers and flags clobbered
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; $3F00..$3FFF clobbered
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; $00/$01 clobbered
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; $02/$03 clobbered
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; $04/$05 has the address of the next available byte after the okvs
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; $FE/$FF clobbered
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;------------------------------------------------------------------------------
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ParseKeyValueText
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+PARAMS_ON_STACK 5
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+LDPARAM 1
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+STAY @store1
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+STAY @store2
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+LDPARAM 3
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+STAY $FE
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ldy #5
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lda (PARAM),y
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sta @maxLength
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lda ($FE)
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pha
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ldy #1
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lda ($FE),y
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tay
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pla
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sec
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sbc #$01
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sta $FE
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bcs +
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dey
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+ sty $FF
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jsr okvs_init ; reset key/value store
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@store1 !word $FDFD ; SMC
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ldy #$00 ; index into ($FE) pointing to current character
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@newkey ldx #$00 ; X = index into current key
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@gatherKey
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jsr IncAndGetChar
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and #$7F ; keys get their high bit stripped
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cmp #$23 ; '#' is starts a comment (until CR)
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beq @skipComment
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cmp #$3D ; '=' ends the key
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beq @endKey
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cmp #$0D ; found CR before '=', ignore key and start over (also handles blank lines)
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beq @newkey
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cmp #$5B ; '[' ends the parsing
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beq .parseKeyValueDone
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sta gKey,x
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inx
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bpl @gatherKey
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@endKey stx gKeyLen
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ldx #$00 ; now X = index into the current value
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@gatherValue
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jsr IncAndGetChar ; note: values do NOT get their high bit stripped
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cmp #$0D ; CR ends the value
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beq @endValue
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cmp #$00 ; null also ends the value
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beq @endValue
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sta gVal,x
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inx
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bpl @gatherValue
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@endValue
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stx gValLen
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cpx #1
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bne @useMaxLength
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lda gVal
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and #1
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sta gVal ; single-character values get converted to #$00 or #$01 in prefs store
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lda #0
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+HIDE_NEXT_2_BYTES
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@useMaxLength
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@maxLength=*+1
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lda #$FD ; SMC
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sta @appendMaxLength ; all other values get upgraded to max_length so we can update them in place
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phy ; okvs functions clobber everything but we need Y
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jsr okvs_append
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@store2 !word $FDFD ; SMC
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!word gKeyLen
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!word gValLen
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@appendMaxLength
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!byte $FD ; SMC
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ply
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bra @newkey
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@skipComment ; skip to CR
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jsr IncAndGetChar
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cmp #$0D ; CR
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bne @skipComment
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bra @newkey
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;------------------------------------------------------------------------------
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; IncAndGetChar
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;
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; in: Y = index into ($FE)
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; ($FE) -> buffer
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; out: A contains next byte from buffer
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; Y incremented
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; $FF possibly incremented
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;------------------------------------------------------------------------------
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IncAndGetChar
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iny
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bne +
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inc $FF
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+ lda ($FE),y
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.parseKeyValueDone
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rts
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