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ProgramManipulation.asm
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ProgramManipulation.asm
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;;<< PROGRAM EDITING AND MANIPULATION
;;< DELETE, RENUM, DATA, REM, ', ELSE and
;;< a bunch of related utility stuff
;;=====================================================
;;poss clear program area
poss_clear_program_area: ;{{Addr=$e761 Code Calls/jump count: 1 Data use count: 0}}
xor a ;{{e761:af}}
ld hl,(address_of_end_of_ROM_lower_reserved_are);{{e762:2a64ae}}
ld (hl),a ;{{e765:77}}
inc hl ;{{e766:23}}
ld (hl),a ;{{e767:77}}
inc hl ;{{e768:23}}
ld (hl),a ;{{e769:77}}
inc hl ;{{e76a:23}}
ld (address_after_end_of_program),hl;{{e76b:2266ae}}
jr _convert_all_line_addresses_to_line_numbers_11;{{e76e:1811}} (+$11)
;;=convert all line addresses to line numbers
;Scoots over every line to convert the line numbers to line addresses
convert_all_line_addresses_to_line_numbers:;{{Addr=$e770 Code Calls/jump count: 4 Data use count: 0}}
ld a,(poss_line_address_vs_line_number_flag_);{{e770:3a21ae}}
or a ;{{e773:b7}}
ret z ;{{e774:c8}} Abort if we already have line numbers
push bc ;{{e775:c5}}
push de ;{{e776:d5}}
push hl ;{{e777:e5}}
ld bc,convert_line_addresses_to_line_numbers;{{e778:0186e7}} convert line address to line number ##LABEL##
call iterator__call_BC_for_each_line;{{e77b:cdb9e9}} Iterator - calls code at BC for every line/statement
pop hl ;{{e77e:e1}}
pop de ;{{e77f:d1}}
pop bc ;{{e780:c1}}
_convert_all_line_addresses_to_line_numbers_11:;{{Addr=$e781 Code Calls/jump count: 1 Data use count: 0}}
xor a ;{{e781:af}}
ld (poss_line_address_vs_line_number_flag_),a;{{e782:3221ae}} Set flag
ret ;{{e785:c9}}
;;=================================================
;; convert line addresses to line numbers
;Converts line addresses (pointers) within a statement to line numbers
convert_line_addresses_to_line_numbers:;{{Addr=$e786 Code Calls/jump count: 2 Data use count: 1}}
call skip_next_tokenised_item;{{e786:cdfde9}}
cp $02 ;{{e789:fe02}}
ret c ;{{e78b:d8}}
cp $1d ;{{e78c:fe1d}} 16-bit line address pointer
jr nz,convert_line_addresses_to_line_numbers;{{e78e:20f6}}
ld d,(hl) ;{{e790:56}} get address
dec hl ;{{e791:2b}}
ld e,(hl) ;{{e792:5e}}
dec hl ;{{e793:2b}}
push hl ;{{e794:e5}}
ex de,hl ;{{e795:eb}}
inc hl ;{{e796:23}}
inc hl ;{{e797:23}}
inc hl ;{{e798:23}}
ld e,(hl) ;{{e799:5e}} line number
inc hl ;{{e79a:23}}
ld d,(hl) ;{{e79b:56}}
pop hl ;{{e79c:e1}}
ld (hl),$1e ;{{e79d:361e}} 16-bit line number
inc hl ;{{e79f:23}}
ld (hl),e ;{{e7a0:73}}
inc hl ;{{e7a1:23}}
ld (hl),d ;{{e7a2:72}}
jr convert_line_addresses_to_line_numbers;{{e7a3:18e1}}
;;-----------------------------------------------------------------
_convert_line_addresses_to_line_numbers_24:;{{Addr=$e7a5 Code Calls/jump count: 2 Data use count: 0}}
ld a,(hl) ;{{e7a5:7e}}
cp $20 ;{{e7a6:fe20}}
jr nz,_convert_line_addresses_to_line_numbers_28;{{e7a8:2001}} (+$01)
inc hl ;{{e7aa:23}}
_convert_line_addresses_to_line_numbers_28:;{{Addr=$e7ab Code Calls/jump count: 1 Data use count: 0}}
call convert_all_line_addresses_to_line_numbers;{{e7ab:cd70e7}} line address to line number
call tokenise_a_BASIC_line;{{e7ae:cda4df}}
push hl ;{{e7b1:e5}}
call skip_space_tab_or_line_feed;{{e7b2:cd4dde}} skip space, lf or tab
or a ;{{e7b5:b7}}
jr z,_convert_line_addresses_to_line_numbers_63;{{e7b6:2828}} (+$28)
push bc ;{{e7b8:c5}}
push de ;{{e7b9:d5}}
ld hl,$0004 ;{{e7ba:210400}}
add hl,bc ;{{e7bd:09}}
push hl ;{{e7be:e5}}
push hl ;{{e7bf:e5}}
call find_address_of_line;{{e7c0:cd64e8}}
push hl ;{{e7c3:e5}}
call c,_convert_line_addresses_to_line_numbers_65;{{e7c4:dce4e7}}
pop de ;{{e7c7:d1}}
pop bc ;{{e7c8:c1}}
call unknown_alloc_and_move_memory_up;{{e7c9:cdb8f6}}
call prob_grow_all_program_space_pointers_by_BC;{{e7cc:cd07f6}}
ex de,hl ;{{e7cf:eb}}
pop de ;{{e7d0:d1}}
ld (hl),e ;{{e7d1:73}}
inc hl ;{{e7d2:23}}
ld (hl),d ;{{e7d3:72}}
inc hl ;{{e7d4:23}}
pop de ;{{e7d5:d1}}
ld (hl),e ;{{e7d6:73}}
inc hl ;{{e7d7:23}}
ld (hl),d ;{{e7d8:72}}
inc hl ;{{e7d9:23}}
pop bc ;{{e7da:c1}}
ex de,hl ;{{e7db:eb}}
pop hl ;{{e7dc:e1}}
ldir ;{{e7dd:edb0}}
ret ;{{e7df:c9}}
_convert_line_addresses_to_line_numbers_63:;{{Addr=$e7e0 Code Calls/jump count: 1 Data use count: 0}}
pop hl ;{{e7e0:e1}}
call find_address_of_line_or_error;{{e7e1:cd5ce8}}
_convert_line_addresses_to_line_numbers_65:;{{Addr=$e7e4 Code Calls/jump count: 2 Data use count: 0}}
ld a,b ;{{e7e4:78}}
or c ;{{e7e5:b1}}
ret z ;{{e7e6:c8}}
ex de,hl ;{{e7e7:eb}}
call move_lower_memory_down;{{e7e8:cde5f6}}
jp prob_grow_all_program_space_pointers_by_BC;{{e7eb:c307f6}}
;;========================================================================
;; command DELETE
command_DELETE: ;{{Addr=$e7ee Code Calls/jump count: 0 Data use count: 1}}
call do_DELETE_find_first_line;{{e7ee:cd00e8}}
call syntax_error_if_not_02;{{e7f1:cd37de}}
call _function_instr_70;{{e7f4:cd4dfb}}
call do_DELETE_find_last_line;{{e7f7:cd1ae8}}
call _reset_basic_33 ;{{e7fa:cd8fc1}}
jp REPL_Read_Eval_Print_Loop;{{e7fd:c358c0}}
;;+do DELETE find first line
do_DELETE_find_first_line: ;{{Addr=$e800 Code Calls/jump count: 2 Data use count: 0}}
call eval_line_number_range_params;{{e800:cd0fcf}}
push hl ;{{e803:e5}}
push bc ;{{e804:c5}}
call find_first_line_at_or_after_line_number;{{e805:cd82e8}}
pop de ;{{e808:d1}}
push hl ;{{e809:e5}}
call find_address_of_line;{{e80a:cd64e8}}
ld (RAM_ae22),hl ;{{e80d:2222ae}}
ex de,hl ;{{e810:eb}}
pop hl ;{{e811:e1}}
or a ;{{e812:b7}}
sbc hl,de ;{{e813:ed52}}
ld (RAM_ae24),hl ;{{e815:2224ae}}
pop hl ;{{e818:e1}}
ret ;{{e819:c9}}
;;+do DELETE find last line
do_DELETE_find_last_line: ;{{Addr=$e81a Code Calls/jump count: 2 Data use count: 0}}
call convert_all_line_addresses_to_line_numbers;{{e81a:cd70e7}} line address to line number
ld bc,(RAM_ae24) ;{{e81d:ed4b24ae}}
ld hl,(RAM_ae22) ;{{e821:2a22ae}}
jp _convert_line_addresses_to_line_numbers_65;{{e824:c3e4e7}}
;;=eval and convert line number to line address
;HL pounts to either a line number ($1e) or line address ($1d) token
;If it's a line address, just return it.
;If it's a line number then convert it to a line address, store
;it back in the code and return it.
eval_and_convert_line_number_to_line_address:;{{Addr=$e827 Code Calls/jump count: 7 Data use count: 0}}
inc hl ;{{e827:23}}
ld e,(hl) ;{{e828:5e}}
inc hl ;{{e829:23}}
ld d,(hl) ;{{e82a:56}}
cp $1d ;{{e82b:fe1d}} 16-bit line address pointer
jr z,_eval_and_convert_line_number_to_line_address_31;{{e82d:282a}} (+$2a) already a pointer so skip to end
cp $1e ;{{e82f:fe1e}} 16-bit line number
jp nz,Error_Syntax_Error;{{e831:c249cb}} Error: Syntax Error
push hl ;{{e834:e5}}
call get_current_line_number;{{e835:cdb5de}} Compare target line number to current??
call c,compare_HL_DE ;{{e838:dcd8ff}} HL=DE? Carry = we have current line
jr nc,_eval_and_convert_line_number_to_line_address_18;{{e83b:300a}} (+$0a)
pop hl ;{{e83d:e1}} If target line after current then scan to next line and scan from there?
push hl ;{{e83e:e5}}
inc hl ;{{e83f:23}}
call command_ELSE ;{{e840:cdade9}} ; ELSE - scans to next statement ignoring nested IFs??
inc hl ;{{e843:23}}
call find_address_of_line_from_current;{{e844:cd68e8}}
_eval_and_convert_line_number_to_line_address_18:;{{Addr=$e847 Code Calls/jump count: 1 Data use count: 0}}
call nc,find_address_of_line_or_error;{{e847:d45ce8}} Scan from the start
dec hl ;{{e84a:2b}}
ex de,hl ;{{e84b:eb}}
pop hl ;{{e84c:e1}}
dec hl ;{{e84d:2b}}
dec hl ;{{e84e:2b}}
;write line address and suitable token
ld a,$1d ;{{e84f:3e1d}} 16-bit line address pointer
ld (poss_line_address_vs_line_number_flag_),a;{{e851:3221ae}}
ld (hl),a ;{{e854:77}}
inc hl ;{{e855:23}}
ld (hl),e ;{{e856:73}}
inc hl ;{{e857:23}}
ld (hl),d ;{{e858:72}}
_eval_and_convert_line_number_to_line_address_31:;{{Addr=$e859 Code Calls/jump count: 1 Data use count: 0}}
jp get_next_token_skipping_space;{{e859:c32cde}} get next token skipping space
;;==================================
;;find address of line or error
find_address_of_line_or_error: ;{{Addr=$e85c Code Calls/jump count: 6 Data use count: 0}}
call find_address_of_line;{{e85c:cd64e8}}
ret c ;{{e85f:d8}}
call byte_following_call_is_error_code;{{e860:cd45cb}}
defb $08 ;Inline error code: "Line does not exist"
;;====================================
;;find address of line
;;BC=line number
find_address_of_line: ;{{Addr=$e864 Code Calls/jump count: 9 Data use count: 0}}
ld hl,(address_of_end_of_ROM_lower_reserved_are);{{e864:2a64ae}}
inc hl ;{{e867:23}}
;;=find address of line from current
;Scan forward starting at current
find_address_of_line_from_current:;{{Addr=$e868 Code Calls/jump count: 2 Data use count: 0}}
ld c,(hl) ;{{e868:4e}}
inc hl ;{{e869:23}}
ld b,(hl) ;{{e86a:46}}
dec hl ;{{e86b:2b}}
ld a,b ;{{e86c:78}}
or c ;{{e86d:b1}}
ret z ;{{e86e:c8}}
push hl ;{{e86f:e5}}
inc hl ;{{e870:23}}
inc hl ;{{e871:23}}
ld a,(hl) ;{{e872:7e}}
inc hl ;{{e873:23}}
ld h,(hl) ;{{e874:66}}
ld l,a ;{{e875:6f}}
ex de,hl ;{{e876:eb}}
call compare_HL_DE ;{{e877:cdd8ff}} HL=DE?
ex de,hl ;{{e87a:eb}}
pop hl ;{{e87b:e1}}
ccf ;{{e87c:3f}}
ret nc ;{{e87d:d0}}
ret z ;{{e87e:c8}}
add hl,bc ;{{e87f:09}}
jr find_address_of_line_from_current;{{e880:18e6}} (-$1a)
;;======================================
;;find first line at or after line number
;;BC=line number
find_first_line_at_or_after_line_number:;{{Addr=$e882 Code Calls/jump count: 1 Data use count: 0}}
ld hl,(address_of_end_of_ROM_lower_reserved_are);{{e882:2a64ae}}
inc hl ;{{e885:23}}
_find_first_line_at_or_after_line_number_2:;{{Addr=$e886 Code Calls/jump count: 1 Data use count: 0}}
push hl ;{{e886:e5}}
ld c,(hl) ;{{e887:4e}}
inc hl ;{{e888:23}}
ld b,(hl) ;{{e889:46}}
inc hl ;{{e88a:23}}
ld a,b ;{{e88b:78}}
or c ;{{e88c:b1}}
scf ;{{e88d:37}}
jr z,_find_first_line_at_or_after_line_number_18;{{e88e:2809}} (+$09)
ld a,(hl) ;{{e890:7e}}
inc hl ;{{e891:23}}
ld h,(hl) ;{{e892:66}}
ld l,a ;{{e893:6f}}
ex de,hl ;{{e894:eb}}
call compare_HL_DE ;{{e895:cdd8ff}} HL=DE?
ex de,hl ;{{e898:eb}}
_find_first_line_at_or_after_line_number_18:;{{Addr=$e899 Code Calls/jump count: 1 Data use count: 0}}
pop hl ;{{e899:e1}}
ret c ;{{e89a:d8}}
add hl,bc ;{{e89b:09}}
jr _find_first_line_at_or_after_line_number_2;{{e89c:18e8}} (-$18)
;;========================================================================
;; command RENUM
command_RENUM: ;{{Addr=$e89e Code Calls/jump count: 0 Data use count: 1}}
ld de,$000a ;{{e89e:110a00}}
call nz,_command_renum_82;{{e8a1:c41ae9}}
push de ;{{e8a4:d5}}
ld de,RESET_ENTRY ;{{e8a5:110000}}
call next_token_if_prev_is_comma;{{e8a8:cd41de}}
call c,_command_renum_82;{{e8ab:dc1ae9}}
push de ;{{e8ae:d5}}
ld de,$000a ;{{e8af:110a00}}
call next_token_if_prev_is_comma;{{e8b2:cd41de}}
call c,eval_line_number_or_error;{{e8b5:dc48cf}}
call syntax_error_if_not_02;{{e8b8:cd37de}}
pop hl ;{{e8bb:e1}}
ex de,hl ;{{e8bc:eb}}
ex (sp),hl ;{{e8bd:e3}}
ex de,hl ;{{e8be:eb}}
push de ;{{e8bf:d5}}
push hl ;{{e8c0:e5}}
call find_address_of_line;{{e8c1:cd64e8}} find address of line
pop de ;{{e8c4:d1}}
push hl ;{{e8c5:e5}}
call find_address_of_line;{{e8c6:cd64e8}} find address of line
ex de,hl ;{{e8c9:eb}}
pop hl ;{{e8ca:e1}}
call compare_HL_DE ;{{e8cb:cdd8ff}} HL=DE?
jr c,_command_renum_51;{{e8ce:381d}} (+$1d)
ex de,hl ;{{e8d0:eb}}
pop de ;{{e8d1:d1}}
pop bc ;{{e8d2:c1}}
push de ;{{e8d3:d5}}
push hl ;{{e8d4:e5}}
_command_renum_30: ;{{Addr=$e8d5 Code Calls/jump count: 1 Data use count: 0}}
push bc ;{{e8d5:c5}}
ld c,(hl) ;{{e8d6:4e}}
inc hl ;{{e8d7:23}}
ld b,(hl) ;{{e8d8:46}}
ld a,b ;{{e8d9:78}}
or c ;{{e8da:b1}}
jr z,_command_renum_52;{{e8db:2813}} (+$13)
dec hl ;{{e8dd:2b}}
add hl,bc ;{{e8de:09}}
ld a,(hl) ;{{e8df:7e}}
inc hl ;{{e8e0:23}}
or (hl) ;{{e8e1:b6}}
jr z,_command_renum_52;{{e8e2:280c}} (+$0c)
dec hl ;{{e8e4:2b}}
pop bc ;{{e8e5:c1}}
push hl ;{{e8e6:e5}}
ex de,hl ;{{e8e7:eb}}
add hl,bc ;{{e8e8:09}}
ex de,hl ;{{e8e9:eb}}
pop hl ;{{e8ea:e1}}
jr nc,_command_renum_30;{{e8eb:30e8}} (-$18)
_command_renum_51: ;{{Addr=$e8ed Code Calls/jump count: 1 Data use count: 0}}
jp Error_Improper_Argument;{{e8ed:c34dcb}} Error: Improper Argument
_command_renum_52: ;{{Addr=$e8f0 Code Calls/jump count: 2 Data use count: 0}}
ld bc,convert_line_numbers_to_line_addresses_callback;{{e8f0:0120e9}} line number to line address ##LABEL##
call iterator__call_BC_for_each_line;{{e8f3:cdb9e9}}
pop bc ;{{e8f6:c1}}
pop hl ;{{e8f7:e1}}
pop de ;{{e8f8:d1}}
_command_renum_57: ;{{Addr=$e8f9 Code Calls/jump count: 1 Data use count: 0}}
push bc ;{{e8f9:c5}}
push hl ;{{e8fa:e5}}
ld c,(hl) ;{{e8fb:4e}}
inc hl ;{{e8fc:23}}
ld b,(hl) ;{{e8fd:46}}
inc hl ;{{e8fe:23}}
ld a,b ;{{e8ff:78}}
or c ;{{e900:b1}}
jr z,_command_renum_77;{{e901:280c}} (+$0c)
ld (hl),e ;{{e903:73}}
inc hl ;{{e904:23}}
ld (hl),d ;{{e905:72}}
inc hl ;{{e906:23}}
pop hl ;{{e907:e1}}
add hl,bc ;{{e908:09}}
pop bc ;{{e909:c1}}
ex de,hl ;{{e90a:eb}}
add hl,bc ;{{e90b:09}}
ex de,hl ;{{e90c:eb}}
jr _command_renum_57 ;{{e90d:18ea}} (-$16)
_command_renum_77: ;{{Addr=$e90f Code Calls/jump count: 1 Data use count: 0}}
pop hl ;{{e90f:e1}}
pop hl ;{{e910:e1}}
ld bc,_convert_line_numbers_to_line_addresses_callback_24;{{e911:0144e9}} ##LABEL##
call iterator__call_BC_for_each_line;{{e914:cdb9e9}}
jp REPL_Read_Eval_Print_Loop;{{e917:c358c0}}
_command_renum_82: ;{{Addr=$e91a Code Calls/jump count: 2 Data use count: 0}}
cp $2c ;{{e91a:fe2c}}
call nz,eval_line_number_or_error;{{e91c:c448cf}}
ret ;{{e91f:c9}}
;;----------------------------------------------------------
;;=convert line numbers to line addresses callback
;Converts line numbers within a statement to line addresses
convert_line_numbers_to_line_addresses_callback:;{{Addr=$e920 Code Calls/jump count: 2 Data use count: 1}}
call skip_next_tokenised_item;{{e920:cdfde9}}
cp $02 ;{{e923:fe02}}
ret c ;{{e925:d8}}
;; convert line number to line address
cp $1e ;{{e926:fe1e}} 16-bit line number
jr nz,convert_line_numbers_to_line_addresses_callback;{{e928:20f6}}
;; 16-bit line number
push hl ;{{e92a:e5}}
ld d,(hl) ;{{e92b:56}}
dec hl ;{{e92c:2b}}
ld e,(hl) ;{{e92d:5e}}
call find_address_of_line;{{e92e:cd64e8}} find address of line
jr nc,_convert_line_numbers_to_line_addresses_callback_22;{{e931:300e}}
dec hl ;{{e933:2b}}
ex de,hl ;{{e934:eb}}
pop hl ;{{e935:e1}}
push hl ;{{e936:e5}}
;; store 16-bit line address in reverse order
ld (hl),d ;{{e937:72}}
dec hl ;{{e938:2b}}
ld (hl),e ;{{e939:73}}
dec hl ;{{e93a:2b}}
;; store 16-bit line address marker
ld a,$1d ;{{e93b:3e1d}} 16 bit line address pointer
ld (hl),a ;{{e93d:77}}
ld (poss_line_address_vs_line_number_flag_),a;{{e93e:3221ae}}
_convert_line_numbers_to_line_addresses_callback_22:;{{Addr=$e941 Code Calls/jump count: 1 Data use count: 0}}
pop hl ;{{e941:e1}}
jr convert_line_numbers_to_line_addresses_callback;{{e942:18dc}}
;;-------------------------------------------------------
;;poss validate line number targets??
;Works on every line number found within a statement
_convert_line_numbers_to_line_addresses_callback_24:;{{Addr=$e944 Code Calls/jump count: 2 Data use count: 1}}
call skip_next_tokenised_item;{{e944:cdfde9}}
cp $02 ;{{e947:fe02}}
ret c ;{{e949:d8}}
;; 16-bit line number?
cp $1e ;{{e94a:fe1e}}
jr nz,_convert_line_numbers_to_line_addresses_callback_24;{{e94c:20f6}} (-$0a)
push hl ;{{e94e:e5}}
ld d,(hl) ;{{e94f:56}}
dec hl ;{{e950:2b}}
ld e,(hl) ;{{e951:5e}}
call get_current_line_number;{{e952:cdb5de}}
call undefined_line_n_in_n_error;{{e955:cde6cb}}
pop hl ;{{e958:e1}}
jr _convert_line_numbers_to_line_addresses_callback_24;{{e959:18e9}} (-$17)
;;=skip to ELSE statement
;Skip tokens with a line until the matching ELSE statement.
;We also need to skip nested IF statements. This is done by
;storing the nesting depth in the B register.
skip_to_ELSE_statement: ;{{Addr=$e95b Code Calls/jump count: 1 Data use count: 0}}
ld b,$00 ;{{e95b:0600}}
dec hl ;{{e95d:2b}}
_skip_to_else_statement_2: ;{{Addr=$e95e Code Calls/jump count: 1 Data use count: 0}}
inc b ;{{e95e:04}} Inc nesting depth
_skip_to_else_statement_3: ;{{Addr=$e95f Code Calls/jump count: 2 Data use count: 0}}
call skip_next_tokenised_item;{{e95f:cdfde9}}
_skip_to_else_statement_4: ;{{Addr=$e962 Code Calls/jump count: 1 Data use count: 0}}
cp $a1 ;{{e962:fea1}} IF token
jr z,_skip_to_else_statement_2;{{e964:28f8}} (-$08) - inc nesting depth
cp $02 ;{{e966:fe02}} end of statement
jr nc,_skip_to_else_statement_3;{{e968:30f5}} (-$0b)
or a ;{{e96a:b7}}
ret z ;{{e96b:c8}} end of line - done
call skip_next_tokenised_item;{{e96c:cdfde9}}
cp $97 ;{{e96f:fe97}} ELSE token
jr nz,_skip_to_else_statement_4;{{e971:20ef}} (-$11)
djnz _skip_to_else_statement_3;{{e973:10ea}} (-$16) dec nesting depth and loop if non zero
call get_next_token_skipping_space;{{e975:cd2cde}} get next token skipping space
inc b ;{{e978:04}}
ret ;{{e979:c9}}
_skip_to_else_statement_17: ;{{Addr=$e97a Code Calls/jump count: 1 Data use count: 0}}
ld a,(hl) ;{{e97a:7e}}
cp $5b ;{{e97b:fe5b}}
jr z,_skip_to_else_statement_22;{{e97d:2803}} (+$03)
cp $28 ;{{e97f:fe28}}
ret nz ;{{e981:c0}}
_skip_to_else_statement_22: ;{{Addr=$e982 Code Calls/jump count: 1 Data use count: 0}}
ld b,$00 ;{{e982:0600}}
_skip_to_else_statement_23: ;{{Addr=$e984 Code Calls/jump count: 2 Data use count: 0}}
inc b ;{{e984:04}}
_skip_to_else_statement_24: ;{{Addr=$e985 Code Calls/jump count: 2 Data use count: 0}}
call skip_next_tokenised_item;{{e985:cdfde9}}
cp $5b ;{{e988:fe5b}}
jr z,_skip_to_else_statement_23;{{e98a:28f8}} (-$08)
cp $28 ;{{e98c:fe28}}
jr z,_skip_to_else_statement_23;{{e98e:28f4}} (-$0c)
cp $5d ;{{e990:fe5d}}
jr z,_skip_to_else_statement_36;{{e992:280b}} (+$0b)
cp $29 ;{{e994:fe29}}
jr z,_skip_to_else_statement_36;{{e996:2807}} (+$07)
cp $02 ;{{e998:fe02}}
jr nc,_skip_to_else_statement_24;{{e99a:30e9}} (-$17)
jp Error_Syntax_Error;{{e99c:c349cb}} Error: Syntax Error
_skip_to_else_statement_36: ;{{Addr=$e99f Code Calls/jump count: 2 Data use count: 0}}
djnz _skip_to_else_statement_24;{{e99f:10e4}} (-$1c)
inc hl ;{{e9a1:23}}
ret ;{{e9a2:c9}}
;;=============================================================================
;; command DATA
command_DATA: ;{{Addr=$e9a3 Code Calls/jump count: 4 Data use count: 1}}
ld b,$01 ;{{e9a3:0601}}
jr _command_else_1 ;{{e9a5:1808}} (+$08)
;;========================================================================
;; command ' or REM
command__or_REM: ;{{Addr=$e9a7 Code Calls/jump count: 2 Data use count: 2}}
ld a,(hl) ;{{e9a7:7e}}
or a ;{{e9a8:b7}}
ret z ;{{e9a9:c8}}
inc hl ;{{e9aa:23}}
jr command__or_REM ;{{e9ab:18fa}} (-$06)
;;========================================================================
;; command ELSE
;We arrive at an ELSE because we've just executed the preceding THEN code.
;We need to skip past the ELSE code and continue with the code after it
;whilst ignoring any nested IFs in the ELSE code. This is done by storing the IF
;nesting level in the B register.
command_ELSE: ;{{Addr=$e9ad Code Calls/jump count: 1 Data use count: 1}}
ld b,$00 ;{{e9ad:0600}} IF nesting level
_command_else_1: ;{{Addr=$e9af Code Calls/jump count: 1 Data use count: 0}}
dec hl ;{{e9af:2b}}
_command_else_2: ;{{Addr=$e9b0 Code Calls/jump count: 1 Data use count: 0}}
call skip_next_tokenised_item;{{e9b0:cdfde9}}
or a ;{{e9b3:b7}}
ret z ;{{e9b4:c8}} return at end of statement
cp b ;{{e9b5:b8}} check nesting level
jr nz,_command_else_2;{{e9b6:20f8}} (-$08) non-zero: keep going
ret ;{{e9b8:c9}} otherwise (zero) exit
;;=iterator - call BC for each line
;Iterates over every line/statement (not totally sure)
;and calls the code in BC for each.
;;Takes a code address to call in BC
iterator__call_BC_for_each_line: ;{{Addr=$e9b9 Code Calls/jump count: 4 Data use count: 0}}
call get_current_line_address;{{e9b9:cdb1de}}
push hl ;{{e9bc:e5}}
ld hl,(address_of_end_of_ROM_lower_reserved_are);{{e9bd:2a64ae}}
_iterator__call_bc_for_each_line_3:;{{Addr=$e9c0 Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{e9c0:23}}
ld a,(hl) ;{{e9c1:7e}}
inc hl ;{{e9c2:23}}
or (hl) ;{{e9c3:b6}}
jr z,_iterator__call_bc_for_each_line_19;{{e9c4:2813}} (+$13)
inc hl ;{{e9c6:23}}
call set_current_line_address;{{e9c7:cdadde}}
inc hl ;{{e9ca:23}}
_iterator__call_bc_for_each_line_11:;{{Addr=$e9cb Code Calls/jump count: 1 Data use count: 0}}
push bc ;{{e9cb:c5}}
call JP_BC ;{{e9cc:cdfcff}} JP (BC)
pop bc ;{{e9cf:c1}}
dec hl ;{{e9d0:2b}}
call skip_until_ELSE_THEN_or_next_statement;{{e9d1:cdefe9}}
or a ;{{e9d4:b7}}
jr nz,_iterator__call_bc_for_each_line_11;{{e9d5:20f4}} (-$0c)
jr _iterator__call_bc_for_each_line_3;{{e9d7:18e7}} (-$19)
_iterator__call_bc_for_each_line_19:;{{Addr=$e9d9 Code Calls/jump count: 1 Data use count: 0}}
pop hl ;{{e9d9:e1}}
jp set_current_line_address;{{e9da:c3adde}}
;;=skip until ELSE, THEN or next statement or error
;Raises an error if we hit the end of program before any of the above
;C=error code
skip_until_ELSE_THEN_or_next_statement_or_error:;{{Addr=$e9dd Code Calls/jump count: 2 Data use count: 0}}
call skip_until_ELSE_THEN_or_next_statement;{{e9dd:cdefe9}}
or a ;{{e9e0:b7}}
ret nz ;{{e9e1:c0}} Non-zero = not end of statement
inc hl ;{{e9e2:23}}
ld a,(hl) ;{{e9e3:7e}}
inc hl ;{{e9e4:23}}
or (hl) ;{{e9e5:b6}} Test for end of program marker (line number zero)
ld a,c ;{{e9e6:79}} Error code
jp z,raise_error ;{{e9e7:ca55cb}}
inc hl ;{{e9ea:23}}
ld d,h ;{{e9eb:54}}
ld e,l ;{{e9ec:5d}}
inc hl ;{{e9ed:23}}
ret ;{{e9ee:c9}}
;;=skip until ELSE, THEN or next statement
skip_until_ELSE_THEN_or_next_statement:;{{Addr=$e9ef Code Calls/jump count: 3 Data use count: 0}}
call skip_next_tokenised_item;{{e9ef:cdfde9}}
cp $02 ;{{e9f2:fe02}}
ret c ;{{e9f4:d8}}
cp $97 ;{{e9f5:fe97}} ELSE
ret z ;{{e9f7:c8}}
cp $eb ;{{e9f8:feeb}} THEN
jr nz,skip_until_ELSE_THEN_or_next_statement;{{e9fa:20f3}} (-$0d)
ret ;{{e9fc:c9}}
;;=skip next tokenised item
;Advances over the next tokenised item,
;including stepping over strings, comments, bar commands etc.
skip_next_tokenised_item: ;{{Addr=$e9fd Code Calls/jump count: 9 Data use count: 0}}
call get_next_token_skipping_space;{{e9fd:cd2cde}} get next token skipping space
ret z ;{{ea00:c8}}
cp $0e ;{{ea01:fe0e}}
jr c,skip_until_bit7_set;{{ea03:3825}} (+$25)
cp $20 ;{{ea05:fe20}} space
jr c,skip_over_numbers;{{ea07:382b}}
cp $22 ;{{ea09:fe22}} double quote
jr z,skip_over_string;{{ea0b:2811}}
cp $7c ;{{ea0d:fe7c}} '|'
jr z,skip_over_bar_command;{{ea0f:281b}} (+$1b)
cp $c0 ;{{ea11:fec0}} "'" comment
jr z,skip_over_comment;{{ea13:2830}} (+$30)
cp $c5 ;{{ea15:fec5}} REM
jr z,skip_over_comment;{{ea17:282c}} (+$2c)
cp $ff ;{{ea19:feff}}
ret nz ;{{ea1b:c0}}
inc hl ;{{ea1c:23}}
ret ;{{ea1d:c9}}
;;----------------------------------------------
;;=skip over string
skip_over_string: ;{{Addr=$ea1e Code Calls/jump count: 2 Data use count: 0}}
inc hl ;{{ea1e:23}}
ld a,(hl) ;{{ea1f:7e}}
cp $22 ;{{ea20:fe22}} '"'
ret z ;{{ea22:c8}}
or a ;{{ea23:b7}}
jr nz,skip_over_string;{{ea24:20f8}} (-$08)
dec hl ;{{ea26:2b}}
ld a,$22 ;{{ea27:3e22}} '"'
ret ;{{ea29:c9}}
;;----------------------------------------------
;;=skip until bit7 set
skip_until_bit7_set: ;{{Addr=$ea2a Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{ea2a:23}}
inc hl ;{{ea2b:23}}
;;=skip over bar command
skip_over_bar_command: ;{{Addr=$ea2c Code Calls/jump count: 1 Data use count: 0}}
push af ;{{ea2c:f5}}
_skip_over_bar_command_1: ;{{Addr=$ea2d Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{ea2d:23}}
ld a,(hl) ;{{ea2e:7e}}
rla ;{{ea2f:17}}
jr nc,_skip_over_bar_command_1;{{ea30:30fb}} (-$05)
pop af ;{{ea32:f1}}
ret ;{{ea33:c9}}
;;--------------------------------------------------
;;=skip over numbers
skip_over_numbers: ;{{Addr=$ea34 Code Calls/jump count: 1 Data use count: 0}}
cp $18 ;{{ea34:fe18}}
ret c ;{{ea36:d8}}
cp $19 ;{{ea37:fe19}} 8-bit integer decimal value
jr z,skip_1_byte_ ;{{ea39:2808}}
cp $1f ;{{ea3b:fe1f}} floating point value
jr c,skip_2_bytes_ ;{{ea3d:3803}}
;; skip 5 bytes
; (length of floating point value representation)
inc hl ;{{ea3f:23}}
inc hl ;{{ea40:23}}
inc hl ;{{ea41:23}}
;;--------------------------------
;;=skip 2 bytes
;(length of 16-bit values)
;; - 16 bit integer decimal value
;; - 16 bit integer binary value
;; - 16 bit integer hexidecimal value
skip_2_bytes_: ;{{Addr=$ea42 Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{ea42:23}}
;;--------------------------------
;;=skip 1 byte
;(length of 8-bit values)
skip_1_byte_: ;{{Addr=$ea43 Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{ea43:23}}
ret ;{{ea44:c9}}
;;--------------------------------
;;=skip over comment
skip_over_comment: ;{{Addr=$ea45 Code Calls/jump count: 2 Data use count: 0}}
push af ;{{ea45:f5}}
inc hl ;{{ea46:23}}
call command__or_REM ;{{ea47:cda7e9}} ' or REM
pop af ;{{ea4a:f1}}
dec hl ;{{ea4b:2b}}
ret ;{{ea4c:c9}}
;;=prob reset links to variables data
;poss clear goto and gosub target addresses?
;Could also be removing links to allocated strings, arrays etc.
;Iterates over every statement and converts some tokens to %0d and
;zeroes out the two bytes after
prob_reset_links_to_variables_data:;{{Addr=$ea4d Code Calls/jump count: 4 Data use count: 0}}
push bc ;{{ea4d:c5}}
push de ;{{ea4e:d5}}
push hl ;{{ea4f:e5}}
ld bc,callback_for_prob_reset_links_to_variables_data;{{ea50:015aea}} ##LABEL##
call iterator__call_BC_for_each_line;{{ea53:cdb9e9}}
pop hl ;{{ea56:e1}}
pop de ;{{ea57:d1}}
pop bc ;{{ea58:c1}}
ret ;{{ea59:c9}}
;;=callback for prob reset links to variables data
;callback for poss clear goto and gosub target addresses
callback_for_prob_reset_links_to_variables_data:;{{Addr=$ea5a Code Calls/jump count: 2 Data use count: 1}}
push hl ;{{ea5a:e5}}
call skip_next_tokenised_item;{{ea5b:cdfde9}}
pop de ;{{ea5e:d1}}
cp $02 ;{{ea5f:fe02}}
ret c ;{{ea61:d8}} Exit at end of line or end (&00) of statement (&01)
cp $0e ;{{ea62:fe0e}}
jr nc,callback_for_prob_reset_links_to_variables_data;{{ea64:30f4}} (-$0c) Loop for values > &0e
ex de,hl ;{{ea66:eb}}
call get_next_token_skipping_space;{{ea67:cd2cde}} get next token skipping space
cp $0d ;{{ea6a:fe0d}}
jr c,_callback_for_prob_reset_links_to_variables_data_12;{{ea6c:3802}} (+$02) Skip changing token for $0d and higher
ld (hl),$0d ;{{ea6e:360d}} So we change tokens $02..$0c to $0d??
_callback_for_prob_reset_links_to_variables_data_12:;{{Addr=$ea70 Code Calls/jump count: 1 Data use count: 0}}
inc hl ;{{ea70:23}}
xor a ;{{ea71:af}} Then zero the two bytes after
ld (hl),a ;{{ea72:77}}
inc hl ;{{ea73:23}}
ld (hl),a ;{{ea74:77}}
ex de,hl ;{{ea75:eb}}
jr callback_for_prob_reset_links_to_variables_data;{{ea76:18e2}} (-$1e) loop for more