Added parsing of assignments without real assignments [~ doSomething(x)]

Author: astrochili

ROADMAP.md

@@ -22,7 +22,6 @@
 - [ ] There is no query functions ```TURNS()``` and ```TURNS_SINCE()```
 - [ ] A list uses only standard numerical values ```1, 2, 3...```. Can't define your own numerical values like ```4, 7, 12...```.
 - [ ] A comment in the middle of the paragraph ```before /* comment */ and after``` splits it into two paragraphs ```before``` and ```and after```
-- [ ] Not possible to run a function after assignment operator without any assignments. *Use ```{ run() }``` instead*.
 
 ## Ideas
 

narrator/parser.lua

@@ -89,7 +89,7 @@ function Parser.parse(content)
     unwrapped = unwrapped:gsub('([%w_]*)%s*([%+%-])[%+%-]', '%1 = %1 %2 1')
     unwrapped = unwrapped:gsub('([%w_]*)%s*([%+%-])=%s*(.*)', '%1 = %1 %2 %3')
     local name, value = unwrapped:match('([%w_]*)%s*=%s*(.*)')
-    return name, value
+    return name or '', value or assignment
   end
 
   --

narrator/story.lua

@@ -749,16 +749,25 @@ end
 -- Variables
 
 function Story:assignValueTo(variable, expression, temp)
-  if self.constants[variable] ~= nil then return end
-  
+  if self.constants[variable] ~= nil then
+    return
+  end
   local value = self:doExpression(expression)
+
+  if #variable == 0 then
+    return
+  end
   local storage = (temp or self.temp[variable] ~= nil) and self.temp or self.variables
 
-  if storage[variable] == value then return end
+  if storage[variable] == value then
+    return
+  end
   storage[variable] = value
 
   local observer = self.observers[variable]
-  if observer ~= nil then observer(value) end
+  if observer ~= nil then
+    observer(value)
+  end
 end
 
 function Story:getValueFor(variable)

test/runtime/binding.lua

@@ -1,7 +1,7 @@
 local narrator, describe, it, assert = ...
 
 local content = [[
-  { beep() }
+  ~ beep()
   { sum(1, 2) }
   { didSolvePuzzle("labirint") }
 ]]