Help: I need some Parenthesis removed.

[Udo Woitek]

Hello,

I've got my first more complex grammar up and working. (Attached file) 

But I need some help with one point: How do I have to change my grammar to get 

"text1"(3+4)(3)(A)"text2" to parse as well as 

"text1" 3+4 "text2" or 

"text1" 3+4 NewLine

If I remove the parenthesis from the definitions in <ConcatTokens> I get a Shift-Reduce Conflict and some Reduce-Reduce Conflicts.

Any advice for a newbie?

Thank you.

Udo.

[svv1999]

Udo Woitek wrote:

Any advice for a newbie?

No advice because finding grammars is undecidable.
But a hint: languages usually declare operators even for multiplication, i.e. "a*b" instead of "a b" must be written.

-manfred

[Devin Cook]

So, the multiplication is implied? Is this a language you are creating or one what is currently in active use?

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[Udo Woitek]

Hello,

thank you for your replies. I try to make a parser for the solver language in WinCachebox where it is possible to do string concatenations the way I described. Ther you can do something like "X"(3+3)(1)(2*4)" Y"(4/2) which ends after calculation in "X618 Y2" and "X"2*50"Y" too which ends in "X100Y".

At the moment I solved my problem by forcing the user to write parenthesis around the expressions and using the parser to parse only one liners. 

I am at vacation at the moment so I have no access to my current version of the grammar. But as soon as I am back I will post the next version.

Thank you,

 Udo.

On Sunday, 21 July 2013 01:21:17 UTC+2, Devin Cook wrote:

So, the multiplication is implied? Is this a language you are creating or one what is currently in active use?

On Sat, Jul 20, 2013 at 9:07 AM, svv1999 <svv...@googlemail.com> wrote:

Udo Woitek wrote:

Any advice for a newbie?

No advice because finding grammars is undecidable.
But a hint: languages usually declare operators even for multiplication, i.e. "a*b" instead of "a b" must be written.

-manfred

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[svv1999]

Udo Woitek wrote:

parser for the solver language in WinCachebox

Another hint:
In the rule
  <ConcatTokens> ::= '(' <Expression> ')'
remove the parenthesis and explain yourself the errror message.

-manfred