For completeness, here's the current (and trivial) "body" production. Comments
welcome, though I can't imagine what they'd be.
This production collects child lines of a parent line until it sees the
concluding dedent. It's only triggered when there are child lines at all
(i_expr doesn't call body unless there's an "indent"). Practically all the
real work is done by its recursing back to i_expr.
The "same" non-terminal doesn't really do anything, it's just a reminder that
each child has to have the same indentation (which must, by definition, be
longer than its parents').
--- David A. Wheeler
================================================
// "body" handles the sequence of 1+ child lines in an i_expr
// (e.g., after a "head"), each of which is itself an i_expr.
// It returns the list of expressions in the body.
// Note that an i-expr will consume any line comments or hspaces
// before it returns back to the "body" production.
// Non-tokenizing implementation notes:
// Note that i_expr will consume any line comments (line comments after
// content, as well as lines that just contain indents and comments).
// Note also that i-expr may set the the current indent to a different value
// than the indent used on entry to body; the latest indent is compared by
// the special terminals DEDENT and BADDENT.
body returns [Object v] : i_expr
(same body1=body {$v = cons($i_expr.v, $body1.v);}
| dedent {$v = list($i_expr.v);} ) ;
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