Commits on Dec 31, 2013

1. Added support for subexpressions …

   Handlebars now supports subexpressions.
   
       {{foo (bar 3)}}
   
   Subexpressions are always evaluated as helpers; if
   `3` were omitted from the above example, `bar`
   would be invoked as a param-less helper, even
   though a top-levell `{{bar}}` would be considered
   ambiguous.
   
   The return value of a subexpression helper is
   passed in as a parameter of a parent subexpression
   helper, even in string params mode. Their type,
   as listed in `options.types` or `options.hashTypes`
   in string params mode, is "sexpr".
   
   The main conceptual change in the Handlebars code
   is that there is a new AST.SexprNode that manages
   the params/hash passed into a mustache, as well
   as the logic that governs whether that mustache
   is a helper invocation, property lookup, etc.
   MustacheNode, which used to manage this stuff,
   still exists, but only manages things like
   white-space stripping and whether the mustache
   is escaped or not. So, a MustacheNode _has_
   a SexprNode.
   
   The introduction of subexpressions is fully
   backwards compatible, but a few things needed
   to change about the compiled output of a template
   in order to support subexpressions. The main one
   is that the options hash is no longer stashed in
   a local `options` var before being passed to
   either the helper being invoked or the
   `helperMissing` fallback. Rather, the options
   object is inlined in these cases. This does
   mean compiled template sizes will be a little
   bit larger, even those that don't make use of
   subexpressions, but shouldn't have any noticeable
   impact on performance when actually rendering
   templates as only one of these inlined objects
   will actually get evaluated.

   

   machty committed Dec 31, 2013
   Configuration menu

   • View commit details
   • Copy full SHA for b09333d
   • Browse repository at this point

   Copy the full SHA

   b09333d View commit details

   Browse the repository at this point in the history