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added string.lower() / string.upper()

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This commit is contained in:
Irmen de Jong 2021-01-10 15:22:21 +01:00
parent 24eee0cb34
commit 72b4198301
3 changed files with 64 additions and 48 deletions
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42
compiler/res/prog8lib/string.p8
View File

@ -190,4 +190,46 @@ _found sty P8ZP_SCRATCH_B1
}}
}
asmsub lower(uword st @AY) {
; Lowercases the petscii string in-place.
; (for efficiency, non-letter characters > 128 will also not be left intact,
; but regular text doesn't usually contain those characters anyway.)
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq _done
and #$7f
cmp #97
bcc +
cmp #123
bcs +
and #%11011111
+ sta (P8ZP_SCRATCH_W1),y
iny
bne -
_done rts
}}
}
asmsub upper(uword st @AY) {
; Uppercases the petscii string in-place.
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq _done
cmp #65
bcc +
cmp #91
bcs +
ora #%00100000
+ sta (P8ZP_SCRATCH_W1),y
iny
bne -
_done rts
}}
}
}

6
docs/source/libraries.rst
View File

@ -173,6 +173,12 @@ Provides string manipulation routines.
Often you don't have to call this explicitly and can just write ``string1 = string2``
but this function is useful if you're dealing with addresses for instance.
``lower(string)``
Lowercases the petscii-string in place.
``upper(string)``
Uppercases the petscii-string in place.
floats
------

64
examples/test.p8
View File

@ -12,11 +12,23 @@ main {
str s2 = "12345 ABCDEF..UVWXYZ ()!@#$%;:&*()-=[]<>\xff\xfa\xeb\xc0\n"
str s3 = "12345 \x61\x62\x63\x64\x65\x66..\x75\x76\x77\x78\x79\x7a ()!@#$%;:&*()-=[]<>\xff\xfa\xeb\xc0\n"
lower(s1)
lower(s2)
lower(s3)
txt.lowercase()
txt.print(s1)
txt.print(s2)
txt.print(s3)
string.lower(s1)
string.lower(s2)
string.lower(s3)
txt.print(s1)
txt.print(s2)
txt.print(s3)
string.upper(s1)
string.upper(s2)
string.upper(s3)
txt.print(s1)
txt.print(s2)
txt.print(s3)
@ -24,49 +36,5 @@ main {
txt.nl()
}
asmsub lower(uword st @AY) clobbers(X) {
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq _done
and #$7f
tax
and #%11100000
cmp #%01100000
bne +
txa
and #%11011111
tax
+ txa
sta (P8ZP_SCRATCH_W1),y
iny
bne -
_done rts
}}
}
asmsub upper(uword st @AY) clobbers(X) {
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldy #0
- lda (P8ZP_SCRATCH_W1),y
beq _done
and #$7f
tax
and #%11100000
cmp #%01100000
bne +
txa
and #%11011111
tax
+ txa
sta (P8ZP_SCRATCH_W1),y
iny
bne -
_done rts
}}
}
}