From 7fab11f595d7c75ad4f859fb9af9d06b931a1b14 Mon Sep 17 00:00:00 2001
From: tomsmeding <hallo@tomsmeding.nl>
Date: Sat, 22 Aug 2015 09:59:55 +0200
Subject: Fully working BF interpreter :tada:

---
 bf.prn | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 66 insertions(+), 19 deletions(-)

diff --git a/bf.prn b/bf.prn
index 8d17979..1b305e1 100644
--- a/bf.prn
+++ b/bf.prn
@@ -1,21 +1,36 @@
-10000 "TAPELEN" store
+200 "TAPELEN" store
 
 
 ##First, read in the source
 
-""
-1 while
-	getline
-	dup -1 = if
-		pop
-		0
-	else
-		"\n" swap + +
-		1
-	end
+# ""
+# 1 while
+# 	getline
+# 	dup -1 = if
+# 		pop
+# 		0
+# 	else
+# 		"\n" swap + +
+# 		1
+# 	end
+# end
+# strlen 1 swap substr swap pop
+# #bottom of stack now contains 1 string, the source code
+# strlen "len" store
+# "code" store
+
+argc 1 = ! if
+	"Please give the brainfuck file as a command-line argument." print lf
+	exit
 end
-strlen 1 swap substr swap pop
-#bottom of stack now contains 1 string, the source code
+0 argvget "r" fopen "filehandle" store
+""
+filehandle fgetc
+dup -1 = ! while
+	+
+	filehandle fgetc
+dup -1 = ! end
+pop
 strlen "len" store
 "code" store
 
@@ -46,27 +61,59 @@ dup 0 > while
 		"code" depth + dup swapoutvar
 		i stridx "c" store
 		swap store  #uses the dupped name before the matching swapoutvar
-		#"c = " c + print lf
+		#"c = " c + print stackdump
 
+		c "#" = if stackdump end
 		c "+" = if 1 + 256 % end
 		c "-" = if 255 + 256 % end
 		c "." = if dup chr print end
-		c "," = if pop getc ord 256 % end
-		c ">" = if 1 roll end
-		c "<" = if -1 roll end
+		c "," = if
+			pop
+			getc
+			dup -1 = if
+				pop 255
+			else
+				ord 256 %
+			end
+			#{}"Input put on stack " print dup print lf
+		end
+		c ">" = if -1 roll end
+		c "<" = if 1 roll end
 		c "]" = if
 			i "loopend" depth 1 - + store
-			len "i" store  #essentially, break
+			len "i" store  # == break
 		end
 		c "[" = if
 			i "loopstart" depth + store
 			#"loopstart" print depth print " = " print "loopstart" depth + get print lf
+			0 "didloop" depth + store
 			dup while
+				1 "didloop" depth + store
 				"code" depth + swapoutvar i 1 + len substr swap "code" depth + store execute
 				#stackdump "i = " print i print lf
 				"loopstart" depth + get "i" store
 			dup end
-			"loopend" depth + get 1 + "loopstart" depth + get + "i" store
+			"didloop" depth + get ! if
+				1 "searchdepth" store
+				i 1 + "i" store
+				"code" depth + dup swapoutvar
+				i len < searchdepth 0 > * while
+					i stridx "c" store
+					#"Searching index " print i print " (char " print c print ")" print lf
+					c "[" = if searchdepth 1 + "searchdepth" store end
+					c "]" = if searchdepth 1 - "searchdepth" store end
+					i 1 + "i" store
+				i len < searchdepth 0 > * end
+				#stackdump
+				swap store
+				searchdepth 0 = ! if
+					"No matching ']' found for '[' at index " print loopstart print lf
+					exit
+				end
+				i 1 - "i" store
+			else
+				"loopend" depth + get 1 + "loopstart" depth + get + "i" store
+			end
 			#"after loop, i = " print i print lf
 		end
 
-- 
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