peg.js

template_engine_peg.js

VAR = line:line* { return line; } // Return array of arrays with elements :D
    
start = ws "{{" ws
end = ws "}}" ws

ws "whitespace" 
  = s:[ \t\r]*
  
n "newline" 
  = n:"\n"*

line
  = start:element body:element* n { return [start].concat(body); }
   
// DRY, element coudl be a var or a line of text
element 
	= element: (
    	text
      	/ var
      )
    { return element; }

text
 = ws words:word+ ws { return words.join(""); }

var
  = ws start var_name:word filter:filter? end ws { return {"name": var_name, "filter": filter }; }

filter = ws "|" ws filter:word { return filter; }

word 
	= ws char:[A-z_]+ end:ws {return char.join("") + end; }