Fwd: petit question

Hi Fabrizio,

How are you? Its Friday, its me again :D.

I realized some stuff but still don't really get the Expressions. Let me give you an example:

exp := PPExpressionParser new.

exp term: (($$ asParser trim , #letter asParser star) flatten / ($" asParser trim, $" asParser negate star, $" asParser trim) flatten);

group: [ :g |

g right: '=' asParser trim do: [:a :op :b | {a. op. b.}].

].

exp parse: '$var = "dings"'. "this is valid code"

exp parse: '"dings" = $var'. "this is invalid code"

How do i tell the expression parser to make a constrain on one side? Or a better question could be: How do i combine expression parsers to achieve a similar behavior? Do i even have to? Or am I to assume that the programmer just knows the order...? I could do something like:

group: [ :g |

g right: '=' asParser trim do: [:a :op :b | 

{ (LeftAssignmentSideExpressionParser new parse: a.) op. (RightAssignmentSideExpressionParser new parse: b.) }

].

].

Do you see my Problem?

Cheers Michael