I am currently attempting to enhance my programming language to support arrays, but I am encountering difficulties.
Array
: '[' Expr ("," Expr)* ']'
{{ $$ = ['ArrayList', $1]; }}
| '[' Expr ']'
{{ $$ = ['Array', $2]; }}
| '[' ']'
{{ $$ = ['Empty']; }}
;
However, when trying to parse "[1,2,3,4]," Jison notifies me that it was expecting "]" instead of ",". Any suggestions?
The recursion is not interpreted or rejected. To make it work, you need to split it into two elements:
Array
: '[' Element ']'
{{ $$ = ['ArrayList', $2]; }}
;
Element
: Element "," Expr
{{ $$ = $1 + ',' + $3; }}
| Expr
{{ $$ = $1; }};
When implemented correctly, this code returns the desired Array:
["ArrayList","1,2,3,4"]
jison does not support EBNF syntax. (It seems to neither accept nor reject it.) Therefore, your rule:
Array
: '[' Expr ("," Expr)* ']'
will be treated as if it were:
Array
: '[' Expr "," Expr ']'
To resolve this issue, you should introduce an ExprList production:
Array : '[' ExprList ']'
| '[' ']'
;
ExprList: Expr
| ExprList ',' Expr
;
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