Phrase_from_file vs phrase

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Good question.

In one place I read that all JSON line ends have to have both the CR and LF. Without newline(posix) IIRC the CR is dropped and thus the JSON is considered invalid. See: Preserving CR with LF when converting text files to character codes

However in looking at the JSON spec, it seems that the CR is not required so I will have to see if my parser is following the correct spec.

But you are correct that in most places I would simply use phrase_from_file/2,3 and you could use it in your code.

In an eariler version of this post I noted optimizations as the reason for not using phrase_from_file/2,3 but have since rewrote that part; so leaving this part as it is still of use with regards to DCGs in general.

If you read my example JSON parser (post) and notes you will see that my example code has some optimizations that I should not have done during development per my rules of development.

object([0'{|T1],T) -->
   "{",
   (
      'ws*'(T1,[0'}|T])
   ;
      'member_first'(T1,[0'}|T])
   ).