Streamlining the creation of JavaScript/ECMAScript array literals

Currently in the process of developing a JavaScript/ECMAScript 5.1 parser using JavaCC and encountering challenges with the ArrayLiteral production.

ArrayLiteral :
    [ Elision_opt ]
    [ ElementList ]
    [ ElementList , Elision_opt ]

ElementList :
    Elision_opt AssignmentExpression
    ElementList , Elision_opt AssignmentExpression

Elision :
    ,
    Elision ,

Three questions will be addressed individually:

An attempt was made to simplify/rewrite the ArrayLiteral production as shown below (pseudo-grammar):

ArrayLiteral:
    "[" ("," | AssignmentExpression ",") * AssignmentExpression ? "]"

Question 1: Is this rewriting accurate?

Other inquiries include:

  • LOOKAHEADs for the JavaScript/ECMAScript array literal production
  • How to implement a negative LOOKAHEAD check for a token in JavaCC?
javascriptparsinggrammarecmascript-5javacc

Answer №1

Acknowledged, that effectively captures the grammar as presented.

Yet, a more optimal revision would read:

"[" AssignmentExpression ? ( "," AssignmentExpression ? ) * "]"

since the initial rewriting in the original post is not LL(1) -- discerning between possibilities requires parsing the entirety of AssignmentExpression-- whereas this revised version allows identifying the appropriate alternative simply by examining the first token.

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