nl_tokens: substitutes all occurrences based in the it object
pl_tokens: function ( input , it ) { var output = input ; var expr ; while ( ( expr = this . getExpr ( output ) ) !== null ) { var evalsTo = $parse ( expr . expr ) ( { <mask> : it } ) ; output = output . substring ( 0 , expr . start ) + evalsTo + output . substring ( expr . stop + 1 ) ; } return output ; }