6502/6502_EhBASIC_V2.22
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changed mixed case patch

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better tokenize - source: jbevren @ forum.6502.org
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Klaus2m5 2018-01-20 14:19:53 +01:00
parent 229c744455
commit 0a70ad5bd0
1 changed files with 10 additions and 11 deletions
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21
mixed_case_keywords_mod.txt
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@ -1,7 +1,7 @@
Tokenizer mixed case keyword recognition
This modification is based on a patch by user ArnoldLayne of the 6502.org
forum: http://forum.6502.org/viewtopic.php?f=5&t=4383
This modification is based on a patch by user ArnoldLayne and jbevren of the
6502.org forum: http://forum.6502.org/viewtopic.php?f=5&t=4383
In EhBasic keywords must be upper case. This may be inconvenient on computers
with mixed case support. The modification below changes the tokenizer to match
@ -25,7 +25,7 @@ LAB_13AC
LDA Ibuffs,X ; get byte from input buffer
BEQ LAB_13EC ; if null save byte then exit
; *** begin patch: lower case token recognition ***
; *** begin patch: lower case token recognition V2 ***
; *** WARNING! changes documented behavior!
; *** add
CMP #'{' ; convert lower to upper case
@ -103,14 +103,13 @@ LAB_13D8
BMI LAB_13EA ; all bytes matched so go save token
INX ; next buffer byte
CMP Ibuffs,X ; compare with byte from input buffer
BEQ LAB_13D6 ; go compare next if match
;*** add
ORA #$20 ; repeat with lower case
CMP Ibuffs,X ; compare with byte from input buffer
BEQ LAB_13D6 ; go compare next if match
; *** replace
; CMP Ibuffs,X ; compare with byte from input buffer
; *** with
EOR Ibuffs,x ; check bits against table
AND #$DF ; DF masks the upper/lower case bit
; *** end
BEQ LAB_13D6 ; go compare next if match
BNE LAB_1417 ; branch if >< (not found keyword)
@ -177,7 +176,7 @@ LAB_141B
; *** add label
PATCH_LC2
; *** end
; *** end patch: lower case token recognition ***
; *** end patch: lower case token recognition V2 ***
LDA Ibuffs,X ; restore byte from input buffer
BPL LAB_13EA ; branch always (all bytes in buffer are $00-$7F)