So... away I went... and that seems to work, BUT!

where when I parsed 4+1*2 before I got

$VAR1 = [ '4', '+', [ '1', '*', '2' ] ];
Now I get
$VAR1 = [ [ [ [ '4' ] ], '+', [ [ '1' ], '*', [ '2' ] ] ] ];
Ick... any good way to clean that up? It gets really nasty with more complex statements.
Here is the new grammar.
startrule: comparison_expr comparison_expr: additive_expr (comparison_op additive_expr { [ @item[1..2] ] })(s?) { [ $item[1], map { @ $_ } @{$item[2]} ] } comparison_op: />=?|<=?|!=|==?|le|ge|eq|ne|lt|gt/ additive_expr: multiplicative_expr (additive_op multiplicative_expr { [ @item[1..2] ] })(s +?) { [ $item[1], map { @ $_ } @{$item[2]} ] } additive_op: /[+-]/ multiplicative_expr: modulus_expr (multiplicative_op modulus_expr { [ @item[1..2] ] })(s? +) { [ $item[1], map { @ $_ } @{$item[2]} ] } multiplicative_op: /[*\/]/ modulus_expr: paren_expr ('%' paren_expr { [ @item[1..2] ] })(s?) { [ $item[1], map { @ $_ } @{$item[2]} ] } paren_expr: '(' comparison_expr ')' { $item[2] } | number number: /[+-]?\d+/ { $item[1] }

                - Ant
                - Some of my best work - (1 2 3)


In reply to Re^2: Order of Precedence in Parse::RecDescent grammar by suaveant
in thread Order of Precedence in Parse::RecDescent grammar by suaveant

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.