| 1 | \ @(#) strings.fth 98/01/26 1.2 |
| 2 | \ String support for PForth |
| 3 | \ |
| 4 | \ Copyright Phil Burk 1994 |
| 5 | |
| 6 | ANEW TASK-STRINGS.FTH |
| 7 | |
| 8 | : -TRAILING ( c-addr u1 -- c-addr u2 , strip trailing blanks ) |
| 9 | dup 0> |
| 10 | IF |
| 11 | BEGIN |
| 12 | 2dup 1- chars + c@ bl = |
| 13 | over 0> and |
| 14 | WHILE |
| 15 | 1- |
| 16 | REPEAT |
| 17 | THEN |
| 18 | ; |
| 19 | |
| 20 | \ Structure of string table |
| 21 | : $ARRAY ( ) |
| 22 | CREATE ( #strings #chars_max -- ) |
| 23 | dup , |
| 24 | 2+ * even-up allot |
| 25 | DOES> ( index -- $addr ) |
| 26 | dup @ ( get #chars ) |
| 27 | rot * + cell+ |
| 28 | ; |
| 29 | |
| 30 | \ Compare two strings |
| 31 | : $= ( $1 $2 -- flag , true if equal ) |
| 32 | -1 -rot |
| 33 | dup c@ 1+ 0 |
| 34 | DO dup c@ tolower |
| 35 | 2 pick c@ tolower - |
| 36 | IF rot drop 0 -rot LEAVE |
| 37 | THEN |
| 38 | 1+ swap 1+ swap |
| 39 | LOOP 2drop |
| 40 | ; |
| 41 | |
| 42 | : TEXT= ( addr1 addr2 count -- flag ) |
| 43 | >r -1 -rot |
| 44 | r> 0 |
| 45 | ?DO dup c@ tolower |
| 46 | 2 pick c@ tolower - |
| 47 | IF rot drop 0 -rot LEAVE |
| 48 | THEN |
| 49 | 1+ swap 1+ swap |
| 50 | LOOP 2drop |
| 51 | ; |
| 52 | |
| 53 | : TEXT=? ( addr1 count addr2 -- flag , for JForth compatibility ) |
| 54 | swap text= |
| 55 | ; |
| 56 | |
| 57 | : $MATCH? ( $string1 $string2 -- flag , case INsensitive ) |
| 58 | dup c@ 1+ text= |
| 59 | ; |
| 60 | |
| 61 | |
| 62 | : INDEX ( $string char -- false | address_char true , search for char in string ) |
| 63 | >r >r 0 r> r> |
| 64 | over c@ 1+ 1 |
| 65 | DO over i + c@ over = |
| 66 | IF rot drop |
| 67 | over i + rot rot LEAVE |
| 68 | THEN |
| 69 | LOOP 2drop |
| 70 | ?dup 0= 0= |
| 71 | ; |
| 72 | |
| 73 | |
| 74 | : $APPEND.CHAR ( $string char -- ) \ ugly stack diagram |
| 75 | over count chars + c! |
| 76 | dup c@ 1+ swap c! |
| 77 | ; |
| 78 | |
| 79 | \ ---------------------------------------------- |
| 80 | : ($ROM) ( index address -- $string ) |
| 81 | ( -- index address ) |
| 82 | swap 0 |
| 83 | ?DO dup c@ 1+ + aligned |
| 84 | LOOP |
| 85 | ; |
| 86 | |
| 87 | : $ROM ( packed array of strings, unalterable ) |
| 88 | CREATE ( <name> -- ) |
| 89 | DOES> ( index -- $string ) ($rom) |
| 90 | ; |
| 91 | |
| 92 | : TEXTROM ( packed array of strings, unalterable ) |
| 93 | CREATE ( <name> -- ) |
| 94 | DOES> ( index -- address count ) ($rom) count |
| 95 | ; |
| 96 | |
| 97 | \ ----------------------------------------------- |