From 6aa48afdd57d03314fdf4be6c9da911c32277c84 Mon Sep 17 00:00:00 2001
From: Bardur Arantsson <bardur@scientician.net>
Date: Fri, 8 Jan 2010 20:28:34 +0100
Subject: Import tome-2.3.5.

---
 src/lua/clean.lua | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 src/lua/clean.lua

(limited to 'src/lua/clean.lua')

diff --git a/src/lua/clean.lua b/src/lua/clean.lua
new file mode 100644
index 00000000..ba08d534
--- /dev/null
+++ b/src/lua/clean.lua
@@ -0,0 +1,74 @@
+-- mark up comments and strings
+STR1 = "\001"
+STR2 = "\002"
+STR3 = "\003"
+STR4 = "\004"
+REM  = "\005"
+ANY  = "([\001-\005])"
+ESC1 = "\006"
+ESC2 = "\007"
+
+MASK = { -- the substitution order is important
+ {ESC1, "\\'"},
+ {ESC2, '\\"'},
+ {STR1, "'"},
+ {STR2, '"'},
+ {STR3, "%[%["},
+ {STR4, "%]%]"},
+ {REM , "%-%-"},
+}
+
+function mask (s)
+ for i = 1,getn(MASK)  do
+  s = gsub(s,MASK[i][2],MASK[i][1])
+ end
+ return s
+end
+
+function unmask (s)
+ for i = 1,getn(MASK)  do
+  s = gsub(s,MASK[i][1],MASK[i][2])
+ end
+ return s
+end
+
+function clean (s)
+ -- check for compilation error
+ local code = "return function () " .. s .. " end" 
+ if not dostring(code) then
+  return nil
+ end
+
+ local S = "" -- saved string
+
+ s = mask(s)
+
+ -- remove blanks and comments
+ while 1 do
+  local b,e,d = strfind(s,ANY)
+  if b then 
+   S = S..strsub(s,1,b-1)
+   s = strsub(s,b+1)
+   if d==STR1 or d==STR2 then
+    e = strfind(s,d)
+    S = S ..d..strsub(s,1,e)
+    s = strsub(s,e+1)
+   elseif d==STR3 then
+    e = strfind(s,STR4)
+    S = S..d..strsub(s,1,e)
+    s = strsub(s,e+1)
+   elseif d==REM then
+    s = gsub(s,"[^\n]*(\n?)","%1",1)
+   end 
+  else
+   S = S..s
+   break
+  end
+ end
+ -- eliminate unecessary spaces
+ S = gsub(S,"[ \t]+"," ")
+ S = gsub(S,"[ \t]*\n[ \t]*","\n")
+ S = unmask(S)
+ return S
+end
+
-- 
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