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In Kitty, statements can be separated by semicolons. This is handled in the StmtList grammar production whose semantic extract is a list of statements. Note that you could have written this rule in a head-recursive way: StmtList: | Stmt { [$1] } | Stmt SEMI StmtList { $1 @ [ $3 ] } Unlike in recursive-descent or any other LL parsing technique, the previous rule does not pose a problem for fsyacc, and thus no left-factoring is needed. However, it does create a copy of the statement list each time a new expression is appended to it. We have eliminated this by using the following productions: StmtList: | Stmt { [$1] } | StmtList SEMI Stmt { $3 :: $1 } combined with a List.rev where the rule is used. This rule consumes all statements and inserts each one by one to the singleton list that contains the first statement. As a result, the return list will be in reverse order, which is why you need to apply List.rev. You may want to define a separate rule to perform this operation. Another feature that is often needed is the ability to parse empty or optional lists. This can be easily accomplished using an empty (epsilon) symbol as in the following example: StmtListOpt: { [] } | StmtList { $1 } This rule matches an optional list of statements and returns an empty list if no statements can be parsed.

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Figure 3-8 A source and target selected in the Copy Web Site interface of Visual Studio NET 2005 The problem with this model came into the picture during the maintenance stage that always follows a deployment Any change to any code behind the page has to be recompiled into the Assembly in the bin directory When a new version of that Assembly gets copied to the production server, each and every Web Form in the site regens and recompiles upon its next request Considering the extensive overhead involved in this process, multiplied by the number of pages in the application, you re looking at a serious cost to incur for what often is just a minor change to a class Well, no more.

cpu elapsed disk query current -------- ---------- ---------- ---------- ---------0.00 0.00 0 0 0 0.01 0.00 0 0 0 0.00 0.00 0 35 0 -------- ---------- ---------- ---------- ---------0.01 0.00 0 35 0

As usual with arithmetic operators, division and multiplication should take precedence over addition and subtraction, so 1+2*3 should be parsed as 1+(2*3). With fsyacc this can be expressed easily using the associativity directives or, to be more precise, their ordering: // Associativity and Precedences - Lowest precedence comes first %left PLUS MINUS %left TIMES By specifying what tokens associate and where (how strongly they bind), you can control how parse derivations are performed. For instance, giving left-associativity to the addition operator (PLUS), given an input 1+2+3, the parser will automatically generate a nonambiguous derivation in the form of (1+2)+3. The basic arithmetic operators are left-associative and should be listed from the lowest precedence to the highest; in our example, the addition and subtraction operators have lower precedence than multiplication the way it should be. Other associativity specifications include %nonassoc and %right, which are used to denote that a given symbol does not associate or associates to the right, respectively. The former is useful for relational and equality operators such as <, >, or !=, where the operator is not applicable if applied multiple times, so 1 > 2 > 3 would yield a syntax error. You can also give precedence to a rule by using %prec at the end of the rule and giving a token whose precedence is to be applied. You can list arbitrary tokens in the associativity and precedence declarations, even if they have not been declared as tokens, and use them in such situations. You can find more details on specifying precedence at http://www.expert-fsharp.com/ Topics/FsYacc.

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Because the code-behind is now a partial class, and because that class isn t generated until runtime, there is no Web Project Assembly that needs to be deployed anymore This means that you can create and deploy a Web Project without a compilation step You can leave it until runtime Just code it, copy it out, and you re done Sounds great, no No No you say You like to compile your application before deploying it What kind of nonsense is that You never had to compile classic ASP! Of course you like to compile Compiling is a beautiful thing Compiling finds typos, enforces type safety, validates references, and generally makes our lives much easier The good news is Visual Studio NET allows you to compile before deploying, even though it s not technically required to compile before deploying Compilation is actually more powerful in Visual Studio .

Tip One useful option for fsyacc.exe is -v, which causes fsyacc to produce a readable extract of the

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