blob: dc5a3b08949ae8af9b2cd15c1b932337009c47de (
plain)
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|
lex:
ldx
txa
txy
sty.q idx0
sty.q idx1
sty.q idx2
sty regb
@getline:
lda
lsl
ldb
lda.w ltok
jsr set_ptr
lda.w (ptr2)
jsr set_ptr
sta.w ctok
and
@loop:
ldy.w idx0
lda (ptr), y
jsr isdelm
cmp
beq @end
@spaces:
ldy.w idx0
lda (ptr), y
pha
jsr isdelm
and
pla
beq @isstart
inc.w idx0
cmp
beq @incs
cmp
beq @inct
bra @spaces
@incs:
inc idx1
bra @spaces
@inct:
inc idx1+1
bra @spaces
@isstart:
pha.w
lda.w idx1
pla.w
beq @switch
cpb
bne @switch
@whtspace:
ldy
lda.w idx1
sta.w (ptr2), y
and
sta.w idx1
deb
@switch:
ldy.w idx0
lda (ptr), y
jsr get_ptok
jsr parse_ptok
bra @loop
@end:
jsr update_ptr
tay
and
rts
parse_ptok:
pha
ldb
lda.w
jsr set_ptr
and
pla
phy.w
lsl
tay
lda.w (ptr3), y
jsr set_ptr
and
tab
ply.w
jmp (ptr3)
ptok_dot:
ldb
jsr init_lex
ldb
jsr delmcpy
@isop:
lda regb
beq @dir
@rs:
lda
sta lex_type
ldy.w idx1
dey
lda (ptr3), y
jsr get_rs
bra @end
@dir:
lda
sta lex_type
ldb
stb.q idx1
jsr set_lexptr
@dir_loop:
ldb idx1
cpb
beq @end
lda.w
clc
adc.w idx2
pha.q
jsr strcaseptr
pla.q
beq @found
inc idx1
@getlen:
jsr strlen
inc
clc
adc.w idx2
sta.w idx2
bra @dir_loop
@found:
nop
@end:
jsr make_tok
jsr set_cmdbuf
rts
ptok_at:
inc.w idx0
rts
ptok_col:
inc.w idx0
rts
ptok_equ:
inc.w idx0
rts
ptok_plus:
lda
bra ptok_expr
ptok_min:
lda
bra ptok_expr
ptok_gt:
lda
bra ptok_expr
ptok_lt:
lda
ptok_expr:
lda
sta lex_type
inc.w idx0
jsr make_tok
jsr set_cmdbuf
rts
ptok_lbrk:
inc.w idx0
rts
ptok_rbrk:
inc.w idx0
rts
ptok_com:
inc.w idx0
rts
ptok_xr:
inc.w idx0
rts
ptok_yr:
inc.w idx0
rts
ptok_sp:
inc.w idx0
rts
ptok_pc:
inc.w idx0
rts
ptok_dqu:
ldb
jsr init_lex
ldb
jsr delmcpy
@end:
rts
ptok_squ:
ldb
jsr init_lex
ldb
jsr delmcpy
@end:
rts
ptok_hash:
inc.w idx0
rts
ptok_scol:
ldb
jsr init_lex
ldb
jsr delmcpy
@end:
rts
ptok_dolr:
lda
sta lex_type
lda
ldb
bra ptok_num2
ptok_prcn:
lda
sta lex_type
lda
ldb
bra ptok_num2
ptok_num:
lda
sta lex_type
lda
ldb
ptok_num2:
pha
jsr init_lex
ldb
jsr delmcpy
pla
jsr strtoullg
jsr make_tok
jsr set_cmdbuf
rts
ptok_alph:
ldb
jsr init_lex
ldb
tba
jsr delmcpy
lda
sta regb
@isop:
ldb
stb.q idx1
jsr set_lexptr
@isop_loop:
lda.w
clc
adc.w idx2
jsr strcaseg
beq @found
ldb idx1
cpb
beq @end
inc idx1
@offset:
lda
clc
mul idx1
sta.w idx2
bra @isop_loop
@found:
lda
sta lex_type
inc regb
@end:
jsr make_tok
jsr set_cmdbuf
rts
ptok_othr:
inc.w idx0
rts
set_lexptr:
lda.d
jsr set_ptr
and
tab
sta.q idx1
sta.q idx2
rts
set_cmdbuf:
and
tab
lda.d
jsr set_ptr
and
tab
rts
init_lex:
cpb
beq @init
@inc_str:
inc.w idx0
@init:
ldb
jsr set_lexptr
phy.w
tay
@loop:
lda (ptr3), y
beq @end
lda
sta (ptr3), y
iny
bra @loop
@end:
ply.w
rts
delmcpy:
sta rega
stb regc
@loop:
ldb
stb regg
ldy.w idx0
lda.q (ptr), y
@loop1:
pha.q
and
pha
lda rega
pla
bne @isdelm2
jsr isdelm
@delmchk:
and regc
pla.q
bne @end
bra @copy
@isdelm2:
jsr isdelm2
bra @delmchk
@copy:
ldy.w idx1
sta (ptr3), y
inc.w idx0
inc.w idx1
lsr
inc regg
ldb regg
cpb
beq @loop
bra @loop1
@end:
ldb
ldy.w idx1
stb (ptr3), y
@end1:
ldy.w idx0
tba
rts
get_rs:
phb
ldb
plb
jsr tolower
cmp
beq @r1
cmp
beq @r2
cmp
beq @r3
@r0:
lda
rts
@r1:
lda
rts
@r2:
lda
rts
@r3:
lda
rts
make_tok:
nop
@end:
rts
|