mirror of
https://github.com/a2-4am/4cade.git
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138 lines
4.2 KiB
Plaintext
138 lines
4.2 KiB
Plaintext
;license:MIT
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;(c) 2018-9 by 4am
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;
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; generic key/value text parser
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;
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; Public functions:
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; - ParseKeyValueList
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; - IncAndGetChar
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;
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;------------------------------------------------------------------------------
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; ParseKeyValueList
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; parse buffer with KEY=VALUE lines of a text file into an okvs
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; keys and values limited to 127 characters, which should be enough for anyone
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; if '=' is missing, key is kept and value is a 0-length string
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; blank lines are ignored
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; '#' character at beginning of line is a comment, entire line is ignored
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; '[' character at beginning of line exits the parser
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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 for okvs
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; +3 [word] handle to buffer containing contents of text file
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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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; $1F00..$1FFF 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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ParseKeyValueList
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+PARAMS_ON_STACK 5
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+LDPARAM 1
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+ST16 @store2
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jsr SetKeyPtr
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ldy #5
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lda (PARAM),y
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sta @maxLength
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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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stx gValLen ; initialize value length (in case this line has no value)
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beq @emptyline ; always branches
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@skipLine ; skip to CR
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jsr IncAndGetChar
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cmp #$0A ; CR
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bne @skipLine
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@emptyline
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jsr IncAndGetChar
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cmp #$0A ; CR in first position (blank line) -> no key
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beq @emptyline
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cmp #$23 ; '#' starts a comment -> no key, skip to CR
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beq @skipLine
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cmp #$5B ; '[' ends the parsing
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beq .parseKeyValueDone
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bne @appendToKey
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@gatherKey
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jsr IncAndGetChar
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cmp #$0A ; CR -> finalize key, no value
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beq @finalizeKey
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cmp #$3D ; '=' -> finalize key, start gathering value
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beq @finalizeKey
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@appendToKey
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sta gKey,x
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inx
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bpl @gatherKey
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@finalizeKey
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stx gKeyLen
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cmp #$0A
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beq @storeInOKVS
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ldx #$00 ; now X = index into the current value
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@gatherValue
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jsr IncAndGetChar
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cmp #$0A ; CR -> finalize value
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beq @finalizeValue
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sta gVal,x
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inx
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bpl @gatherValue
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@finalizeValue
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stx gValLen
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@storeInOKVS
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tya
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pha ; 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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@maxLength
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!byte $FD ; SMC
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pla
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tay
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clc
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bcc @newkey ; always branches
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;------------------------------------------------------------------------------
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; SetKeyPtr
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;
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; in: PARAM set
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; out: okvs initialised
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; ($FE) -> buffer
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;------------------------------------------------------------------------------
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SetKeyPtr
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jsr okvs_init ; reset key/value store
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+LDPARAMPTR 3, $FE
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ldy #0
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lda ($FE),y
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tax
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bne +
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iny
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lda ($FE),y
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sta $FF
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dec $FF
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+ dex
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stx $FE
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rts
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;------------------------------------------------------------------------------
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; IncAndGetChar
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;
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; in: Y = index into ($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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cmp #$0D ; CR - hide it
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beq IncAndGetChar
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.parseKeyValueDone
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rts
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