From 7962e0fd085e408e24201ca3951c48e17aec7411 Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Sat, 7 Feb 2015 21:21:42 -0800
Subject: 711 - extract method: string-copy

---
 mu.arc   | 64 +++++++++++++++++++++++++++++++++++++++-------------------------
 mu.arc.t |  1 +
 2 files changed, 40 insertions(+), 25 deletions(-)

diff --git a/mu.arc b/mu.arc
index 281d542e..a78f80c9 100644
--- a/mu.arc
+++ b/mu.arc
@@ -1621,7 +1621,7 @@
              (~is memory*.addr value.idx)
                (do1 nil
                     (prn "@addr should contain @(repr value.idx) but contains @(repr memory*.addr)")
-;?                     (recur (+ addr 1) (+ idx 1)) ;? 2
+;?                     (recur (+ addr 1) (+ idx 1)) ;? 3
                     )
              :else
                (recur (+ addr 1) (+ idx 1))))))
@@ -2125,31 +2125,13 @@
     (done?:boolean <- greater-or-equal start:integer len:integer)
     (break-if done?:boolean)
     (end:integer <- find-next s:string-address delim:character start:integer)
-;?     ($print (("i: " literal)))
-;?     ($print start:integer)
-;?     ($print (("-" literal)))
-;?     ($print end:integer)
-;?     ($print ((" => " literal)))
-;?     ($print curr-result:integer)
-;?     ($print (("\n" literal)))
-    ; compute length of slice
-    (slice-len:integer <- subtract end:integer start:integer)
-    ; allocate result[curr-result]
-    (dest:string-address-address <- index-address result:string-address-array-address/deref curr-result:integer)
-    (dest:string-address-address/deref <- new string:literal slice-len:integer)
+;?     ($print start:integer) ;? 1
+;?     ($print ((" " literal))) ;? 1
+;?     ($print end:integer) ;? 1
+;?     ($print (("\n" literal))) ;? 1
     ; copy start..end into result[curr-result]
-    (src-idx:integer <- copy start:integer)
-    (dest-idx:integer <- copy 0:literal)
-    { begin
-      (end-copy?:boolean <- greater-or-equal src-idx:integer end:integer)
-      (break-if end-copy?:boolean)
-      (src:character <- index s:string-address/deref src-idx:integer)
-      (tmp:character-address <- index-address dest:string-address-address/deref/deref dest-idx:integer)
-      (tmp:character-address/deref <- copy src:character)
-      (src-idx:integer <- add src-idx:integer 1:literal)
-      (dest-idx:integer <- add dest-idx:integer 1:literal)
-      (loop)
-    }
+    (dest:string-address-address <- index-address result:string-address-array-address/deref curr-result:integer)
+    (dest:string-address-address/deref <- string-copy s:string-address start:integer end:integer)
     ; slide over to next slice
     (start:integer <- add end:integer 1:literal)
     (curr-result:integer <- add curr-result:integer 1:literal)
@@ -2158,6 +2140,38 @@
   (reply result:string-address-array-address)
 )
 
+; todo: make this generic
+(init-fn string-copy  ; buf start end -> address of new array
+  (default-space:space-address <- new space:literal 30:literal)
+  (buf:string-address <- next-input)
+  (start:integer <- next-input)
+  (end:integer <- next-input)
+;?   ($print (("  copy: " literal))) ;? 1
+;?   ($print start:integer) ;? 1
+;?   ($print (("-" literal))) ;? 1
+;?   ($print end:integer) ;? 1
+;?   ($print (("\n" literal))) ;? 1
+  (len:integer <- subtract end:integer start:integer)
+  (result:string-address <- new string:literal len:integer)
+  ; copy start..end into result[curr-result]
+  (src-idx:integer <- copy start:integer)
+  (dest-idx:integer <- copy 0:literal)
+  { begin
+    (done?:boolean <- greater-or-equal src-idx:integer end:integer)
+    (break-if done?:boolean)
+    (src:character <- index buf:string-address/deref src-idx:integer)
+;?     ($print (("  copying " literal))) ;? 1
+;?     ($print src:character) ;? 1
+;?     ($print (("\n" literal))) ;? 1
+    (dest:character-address <- index-address result:string-address/deref dest-idx:integer)
+    (dest:character-address/deref <- copy src:character)
+    (src-idx:integer <- add src-idx:integer 1:literal)
+    (dest-idx:integer <- add dest-idx:integer 1:literal)
+    (loop)
+  }
+  (reply result:string-address)
+)
+
 (init-fn init-keyboard
   (default-space:space-address <- new space:literal 30:literal)
   (result:keyboard-address <- new keyboard:literal)
diff --git a/mu.arc.t b/mu.arc.t
index 8c2168f0..df439e13 100644
--- a/mu.arc.t
+++ b/mu.arc.t
@@ -4354,6 +4354,7 @@
             (~memory-contains-array (memory* (+ base 3)) "")
             (~memory-contains-array (memory* (+ base 4)) "c"))
     (prn "F - 'split' cuts string at two delimiters")))
+;? (quit) ;? 1
 
 (reset)
 (new-trace "integer-to-decimal-string")
-- 
cgit 1.4.1-2-gfad0