Better handling of parsing non-filechunks text.

files.lua

@@ -229,7 +229,15 @@ Files.get_line_number = function(str, pos)
 end
 Files.get_line = function(str, line_no)
   local line_starts = Files.get_line_starts(str)
-  return str:sub(line_starts[line_no] or 1, (line_starts[line_no + 1] or 1) - 2)
+  local start = line_starts[line_no]
+  if not (start) then
+    return 
+  end
+  local stop = line_starts[line_no + 1]
+  if not (stop) then
+    return 
+  end
+  return str:sub(start, stop - 2)
 end
 local get_lines = re.compile([[    lines <- {| line (%nl line)* |}
     line <- {[^%nl]*}

nomsu.2.peg

@@ -1,8 +1,8 @@
 -- Nomsu version 2
 file:
     {:curr_indent: ' '* :}
-    (file_chunks / chunk / (comment? blank_lines? (inline_block / indented_block)))?
+    (((action / expression / inline_block / indented_block) eol !.)
-    blank_lines?
+     / file_chunks / blank_lines / '')
     %ws* (!! .+ -> "Parse error" !!)?
 
 shebang: "#!" (!"nomsu" [^%nl])* "nomsu" %ws+ "-V" %ws* {:version: [0-9.]+ :} [^%nl]*
@@ -10,16 +10,12 @@ shebang: "#!" (!"nomsu" [^%nl])* "nomsu" %ws+ "-V" %ws* {:version: [0-9.]+ :} [^
 file_chunks (FileChunks):
     {:curr_indent: ' '* :}
     shebang? comment? blank_lines?
-    chunk (nl_nodent section_division nl_nodent chunk)+
+    (top_block (nl_nodent section_division top_block)*)
     blank_lines?
 
-chunk:
-    top_block / (comment? blank_lines? statement)
-
 top_block (Block):
     {:curr_indent: ' '* :}
-    shebang? comment? blank_lines?
+    comment? blank_lines? statement (nl_nodent statement)*
-    statement (nl_nodent statement)+
 
 nodent: =curr_indent !(" ")
 indent: =curr_indent "    "

nomsu_compiler.lua

@@ -1062,7 +1062,7 @@ do
               nomsu:append("\n", pop_comments(line.source.start))
               setup = false
             end
-            nomsu:append(pop_comments(line.source.start, '\n'))
+            nomsu:append(pop_comments(line.source.start, tostring(nomsu):match("\n\n$") and "" or "\n"))
             local line_nomsu = self:tree_to_nomsu(line, pop_comments)
             nomsu:append(line_nomsu)
             if line_no < #chunk then
@@ -1076,6 +1076,9 @@ do
         setup = false
       end
       nomsu:append(pop_comments(tree.source.stop, '\n'))
+      if not (tostring(nomsu):match("\n$")) then
+        nomsu:append('\n')
+      end
       return nomsu
     elseif "Action" == _exp_0 then
       local pos, next_space = tree.source.start, ''
@@ -1117,7 +1120,7 @@ do
         local line_nomsu = recurse(line)
         nomsu:append(line_nomsu)
         if i < #tree then
-          nomsu:append(line_nomsu:is_multiline() and "\n\n" or "\n")
+          nomsu:append(tostring(line_nomsu):match('\n[^\n]*\n') and "\n\n" or "\n")
         end
       end
       nomsu:append(pop_comments(tree.source.stop, '\n'))

nomsu_compiler.moon

@@ -667,7 +667,7 @@ with NomsuCompiler
                             elseif setup and not (line.type == "Action" and line.stub == "use %")
                                 nomsu\append "\n", pop_comments(line.source.start)
                                 setup = false
-                            nomsu\append pop_comments(line.source.start, '\n')
+                            nomsu\append pop_comments(line.source.start, tostring(nomsu)\match("\n\n$") and "" or "\n")
                             line_nomsu = @tree_to_nomsu(line, pop_comments)
                             nomsu\append line_nomsu
                             nomsu\append(line_nomsu\is_multiline! and "\n\n" or "\n") if line_no < #chunk
@@ -676,6 +676,7 @@ with NomsuCompiler
                         nomsu\append recurse(chunk)
                     setup = false
                 nomsu\append pop_comments(tree.source.stop, '\n')
+                nomsu\append('\n') unless tostring(nomsu)\match("\n$")
                 return nomsu
 
             when "Action"
@@ -717,7 +718,7 @@ with NomsuCompiler
                     line_nomsu = recurse(line)
                     nomsu\append line_nomsu
                     if i < #tree
-                        nomsu\append(line_nomsu\is_multiline! and "\n\n" or "\n")
+                        nomsu\append(tostring(line_nomsu)\match('\n[^\n]*\n') and "\n\n" or "\n")
                 nomsu\append pop_comments(tree.source.stop, '\n')
                 return NomsuCode(tree.source, ":\n    ", nomsu)
 

parser.lua

@@ -70,19 +70,21 @@ do
     end
     local err_pos = start_pos
     local line_no = files.get_line_number(src, err_pos)
-    local prev_line = line_no == 1 and "" or files.get_line(src, line_no - 1)
+    local prev_line = line_no == 1 and nil or files.get_line(src, line_no - 1)
     local err_line = files.get_line(src, line_no)
     local next_line = files.get_line(src, line_no + 1)
     local i = err_pos - files.get_line_starts(src)[line_no]
     local j = i + (end_pos - start_pos)
     local pointer = ("-"):rep(i) .. "^"
     err_msg = colored.bright(colored.yellow(colored.onred((err_msg or "Parse error") .. " at " .. tostring(userdata.source.filename) .. ":" .. tostring(line_no) .. ":")))
-    if #prev_line > 0 then
+    if prev_line then
       err_msg = err_msg .. ("\n" .. colored.dim(prev_line))
     end
-    err_line = colored.white(err_line:sub(1, i)) .. colored.bright(colored.red(err_line:sub(i + 1, j + 1))) .. colored.dim(err_line:sub(j + 2, -1))
+    if err_line then
-    err_msg = err_msg .. "\n" .. tostring(err_line) .. "\n" .. tostring(colored.red(pointer))
+      err_line = colored.white(err_line:sub(1, i)) .. colored.bright(colored.red(err_line:sub(i + 1, j + 1))) .. colored.dim(err_line:sub(j + 2, -1))
-    if #next_line > 0 then
+      err_msg = err_msg .. "\n" .. tostring(err_line) .. "\n" .. tostring(colored.red(pointer))
+    end
+    if next_line then
       err_msg = err_msg .. ("\n" .. colored.dim(next_line))
     end
     seen_errors[start_pos] = err_msg
@@ -160,12 +162,9 @@ Parser.parse = function(nomsu_code, source, version)
     comments = { }
   }
   local tree = Parser.patterns[syntax_version]:match(nomsu_code, nil, userdata)
-  if not (tree) then
+  if not tree or type(tree) == 'number' then
     error("In file " .. tostring(colored.blue(tostring(source or "<unknown>"))) .. " failed to parse:\n" .. tostring(colored.onyellow(colored.black(nomsu_code))))
   end
-  if type(tree) == 'number' then
-    return nil
-  end
   if next(userdata.errors) then
     local keys
     do