X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=forth.jl.git;a=blobdiff_plain;f=src%2Flib_6_strings.4th;h=753e756a12a8b4ba222b9b4eee607132241e44da;hp=56a2174bf1325c2c87a0ab4f5e838dcadfd009a5;hb=6a34e447b5d32310f63850a794816e30e350cc5c;hpb=30a093845e2d1097242e948bb577fb71f73bc860

diff --git a/src/lib_6_strings.4th b/src/lib_6_strings.4th
index 56a2174..753e756 100644
--- a/src/lib_6_strings.4th
+++ b/src/lib_6_strings.4th
@@ -37,29 +37,41 @@
         DROP
 ;
 
-( Compile-mode word which compiles everything until the next
-  double quote as a litstring. )
-: S" IMMEDIATE          ( -- addr len )
-        ['] LITSTRING ,   ( compile LITSTRING )
-        HERE          ( save the address of the length word on the stack )
-        0 ,             ( dummy length - we don't know what it is yet )
+: COMPILING? STATE @ 0<> ;
+
+( In compile mode, word compiles everything until the next
+  double quote as a litstring.  Otherwise, dynamically allocates
+  memory and stores string there, returning address and length. )
+: S" IMMEDIATE ( -- addr len )
+        COMPILING? IF
+                ['] LITSTRING ,   ( compile LITSTRING )
+                HERE          ( save the address of the length word on the stack )
+                0 ,             ( dummy length - we don't know what it is yet )
+        ELSE
+                HERE    ( save the starting address on the stack )
+        THEN
 
         BEGIN
-                >IN @ #IB @ >= IF      \ End of TIB?
+                >IN @ #IB @ >= IF      \ End of IB?
                         QUERY-INPUT    \ Get next line
                 THEN
 
-                IB >IN @ + @ 1 >IN +!  \ Get char from TIB
+                IB >IN @ + @ 1 >IN +!  \ Get char from IB
 
                 DUP [CHAR] " <>
         WHILE
-                C,              ( copy character )
+                ,              ( copy character )
         REPEAT
         DROP            ( drop the double quote character at the end )
-        DUP             ( get the saved address of the length word )
-        HERE SWAP -   ( calculate the length )
-        1-              ( subtract 1 (because we measured from the start of the length word) )
-        SWAP !          ( and back-fill the length location )
+
+        COMPILING? IF
+                DUP             ( get the saved address of the length word )
+                HERE SWAP -   ( calculate the length )
+                1-              ( subtract 1 (because we measured from the start of the length word) )
+                SWAP !          ( and back-fill the length location )
+        ELSE
+                DUP HERE SWAP -
+        THEN
 ;
 
 ( Compile-mode word which compiles everything until the
@@ -73,11 +85,11 @@
   right-paren to the terminal. )
 : .( 
         BEGIN
-                >IN @ #IB @ >= IF      \ End of TIB?
+                >IN @ #IB @ >= IF      \ End of IB?
                         QUERY-INPUT    \ Get next line
                 THEN
 
-                IB >IN @ + @ 1 >IN +!  \ Get char from TIB
+                IB >IN @ + @ 1 >IN +!  \ Get char from IB
 
                 DUP [CHAR] ) = IF
                         DROP    ( drop the double quote character )
@@ -92,6 +104,39 @@
 : COUNT ( addr1 -- addr2 n )
         DUP 1+ SWAP @ ;
 
+( Compares two strings, returns 0 if identical. )
+: COMPARE ( addr1 n1 addr2 n2 -- res )
+    rot 2dup <> if
+        2drop 2drop 1 exit
+    then
+    
+    drop
+
+    0 do
+        2dup i + @ swap i + @ <> if
+            unloop 2drop 1 exit
+        then
+    loop
+
+    2drop 0
+;
+
+( Converts a string to lower case. )
+: TOLOWER ( addr n -- )
+    0 do
+        dup i + @ dup dup ( addr char char char )
+        [char] A >=
+        swap [char] Z <= and if
+            [char] A - [char] a +
+            over i + !
+        else
+            drop
+        then
+    loop
+
+    drop
+;
+
 ( Abort if flag is true. )
 : ABORT" IMMEDIATE  ( flag -- )
         [COMPILE] S"