From: Tim Vaughan Date: Fri, 6 May 2016 07:08:15 +0000 (+1200) Subject: Implemented \ comments as a word, implemented [CHAR] X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=commitdiff_plain;h=d2b2b3e5b33f882c18c9e7cf8c6623f4e863c2dd;p=forth.jl.git Implemented \ comments as a word, implemented [CHAR] --- diff --git a/src/forth.jl b/src/forth.jl index e571758..b1d782c 100644 --- a/src/forth.jl +++ b/src/forth.jl @@ -626,24 +626,10 @@ WORD = defPrimWord("WORD", () -> begin eof_char = Char(EOF) c = eof_char - skip_to_end = false while true - callPrim(mem[KEY]) c = Char(popPS()) - if c == '\\' - skip_to_end = true - continue - end - - if skip_to_end - if c == '\n' || c == eof_char - skip_to_end = false - end - continue - end - if c == ' ' || c == '\t' continue end @@ -852,7 +838,7 @@ end, name="DOCOL") defConst("DODOES", DODOES) FROMDOES_PAREN = defWord("(DOES>)", - [DODOES, LAST, FETCH, TOCFA, STORE, EXIT]) + [DODOES, LATEST, FETCH, TOCFA, STORE, EXIT]) FROMDOES = defWord("DOES>", [BTICK, FROMDOES_PAREN, COMMA, BTICK, EXIT, COMMA, diff --git a/src/lib.4th b/src/lib.4th index a43f6c1..955cadf 100644 --- a/src/lib.4th +++ b/src/lib.4th @@ -1,3 +1,10 @@ +: \ IMMEDIATE + KEY + 10 = 0BRANCH [ -5 , ] +; \ We can now comment! + +\ BASIC DEFINITIONS ---------------------------------------------------------------------- + : / /MOD SWAP DROP ; : MOD /MOD DROP ; : */ -ROT * SWAP / ; @@ -8,7 +15,8 @@ : FALSE 0 ; : NOT 0= ; - \ Allow for slightly more portable code +\ Translate a number of cells into memory units +\ (in our case 1 cell = 1 memory unit) : CELLS ; \ Since the smallest unit of memory in our system is 64 bits and since strings @@ -25,17 +33,10 @@ : LITERAL IMMEDIATE ['] LIT , , ; -: ':' [ CHAR : ] LITERAL ; -: ';' [ CHAR ; ] LITERAL ; -: '(' [ CHAR ( ] LITERAL ; -: ')' [ CHAR ) ] LITERAL ; -: '<' [ CHAR < ] LITERAL ; -: '>' [ CHAR > ] LITERAL ; -: '"' [ CHAR " ] LITERAL ; -: 'A' [ CHAR A ] LITERAL ; -: '0' [ CHAR 0 ] LITERAL ; -: '-' [ CHAR - ] LITERAL ; -: '.' [ CHAR . ] LITERAL ; +: [CHAR] IMMEDIATE + CHAR + ['] LIT , , +; : CR '\n' emit ; : SPACE BL emit ; @@ -215,11 +216,11 @@ 1 \ allowed nested parens by keeping track of depth BEGIN KEY \ read next character - DUP '(' = IF \ open paren? + DUP [CHAR] ( = IF \ open paren? DROP \ drop the open paren 1+ \ depth increases ELSE - ')' = IF \ close paren? + [CHAR] ) = IF \ close paren? 1- \ depth decreases THEN THEN @@ -291,10 +292,10 @@ ( print the remainder ) DUP 10 < IF - '0' ( decimal digits 0..9 ) + [CHAR] 0 ( decimal digits 0..9 ) ELSE 10 - ( hex and beyond digits A..Z ) - 'A' + [CHAR] A THEN + EMIT @@ -347,7 +348,7 @@ SWAP ( u flag ) IF ( was it negative? print the - character ) - '-' EMIT + [CHAR] - EMIT THEN U. @@ -356,7 +357,7 @@ : . 0 .R SPACE ; : .S ( -- ) - '<' EMIT DEPTH U. '>' EMIT SPACE + [CHAR] < EMIT DEPTH U. [CHAR] > EMIT SPACE PSP0 @ 1+ BEGIN DUP PSP@ 2 - <= @@ -425,7 +426,7 @@ KEY DROP BEGIN KEY ( get next character of the string ) - DUP '"' <> + DUP [CHAR] " <> WHILE C, ( copy character ) REPEAT @@ -439,7 +440,7 @@ KEY DROP BEGIN KEY - DUP '"' <> + DUP [CHAR] " <> WHILE OVER C! ( save next character ) 1+ ( increment address ) @@ -460,7 +461,7 @@ KEY DROP BEGIN KEY - DUP ')' = IF + DUP [CHAR] ) = IF DROP ( drop the double quote character ) EXIT ( return from this function ) THEN @@ -641,7 +642,7 @@ DUP >CFA @ CASE DOCOL OF \ Colon definition - ':' EMIT SPACE DUP ID. SPACE + [CHAR] : EMIT SPACE DUP ID. SPACE DUP ?IMMEDIATE IF ." IMMEDIATE " THEN CR ENDOF DOVAR OF @@ -661,7 +662,7 @@ ENDCASE ( begin the definition with : NAME [IMMEDIATE] ) - ( ':' EMIT SPACE DUP ID. SPACE + ( [CHAR] : EMIT SPACE DUP ID. SPACE DUP ?IMMEDIATE IF ." IMMEDIATE " THEN CR 4 ) 4 SPACES @@ -680,11 +681,11 @@ . ( and print it ) ENDOF ['] LITSTRING OF ( is it LITSTRING ? ) - [ CHAR S ] LITERAL EMIT '"' EMIT SPACE ( print S" ) + [CHAR] S EMIT [CHAR] " EMIT SPACE ( print S" ) 1+ DUP @ ( get the length word ) SWAP 1+ SWAP ( end start+1 length ) 2DUP TELL ( print the string ) - '"' EMIT SPACE ( finish the string with a final quote ) + [CHAR] " EMIT SPACE ( finish the string with a final quote ) + ( end start+1+len, aligned ) 1- ( because we're about to add 4 below ) ENDOF @@ -725,7 +726,7 @@ 1+ ( end start+1 ) REPEAT - ';' EMIT CR + [CHAR] ; EMIT CR 2DROP ( restore stack ) ;