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FromString FromTextReader FromBinaryReader LexemeString this.EndPos this.IsPastEndOf Stream this.StartPos

the upper left corner of the worksheet), and click Home (Cells) Format AutoFit Column Width (for Excel 2007) or Format Column AutoFit Selection (for Excel 2003).

string -> LexBuffer<char> TextReader -> LexBuffer<char> BinaryReader -> LexBuffer<byte> LexBuffer<char> -> string Lexing.Position bool Lexing.Position

Makes a LexBuffer for the given string Makes a LexBuffer for the given text reader Makes a LexBuffer for the given binary reader Returns the matched string Gets/sets the current position associated with the end of the matched token True if the LexBuffer has exhausted the available input Gets/sets the current position associated with the start of the matched token

Adding a record is a fairly straightforward exercise. The set_entry method call is used here, where you will specify an array of name/value pairs that each record should be set to. Listing 4-15 has the code for this example. Listing 4-15. Add a New Record with set_entry

Note FsLex works by constructing a table-driven finite automaton that is executed to consume the input

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Similar to nonrelational databases discussed in the previous section, relational databases store data records in two or more data tables However, relational databases are different than nonrelational databases in one key aspect: the data tables rely on each other to capture all of the facts and figures in the database For example, in a nonrelational database containing customer sales history, one data table contains all of the customers names and addresses and all of the sales transactions for all of the customers In contrast, in a relational database containing customer sales history, one data table would contain the customers names and addresses, while another data table would contain all of the sales transactions for all of the customers You should consider using relational databases for all but the simplest of data lists.

character sequence one by one until a full token can be returned. The automaton blocks until further input is received. The states of this machine are derived from the regular expressions defined by each rule. Singlecharacter literals advance the machine to a new state, and repetitions cause it to remain in the same state. These states form a graph, and the edges between the states are those symbols that advance between the states.

You saw the basic structure of lexer files in the preceding example, which contained only a handful of rules. In general, fslex input files have the following simple structure: // Preamble any user code you need for the lexer, such as opening modules, etc. { [Code] } // Definitions named patterns that you can use in the rules or other definitions let [Ident_1] = [Pattern] let ... // Rules text patterns that trigger certain actions rule [Rule_1] [arg1... argn] = parse | [Pattern] { [Action] } | ... | [Pattern] { [Action] } and [Rule_2] [arg1... argn] = parse ... rule [Rule_3] ... // Epilogue code that can call the lexer rules defined above { [Code] } Each rule defined in the lexer becomes an F# function that can be accessed from other modules and the lexer itself. You can place comments between (* and *), and you can also use // comments in the actions just like in any other F# code. Patterns can be any of the forms listed in Table 16-2. Lexical actions are pieces of F# code enclosed in braces; they re executed when a lexer match is made. You can put any logic here that you like; typically, you construct a token. Tokens are specified in the parser definition using the %token directive (you see this later in this chapter); if you don t have a parser, any user-defined type will do. If your lexer rules don t construct tokens, or if your lexer is simple enough, often you may want to put all driver code in the epilogue section to create a stand-alone lexer. Table 16-2. Patterns in Lexer Rules

// Create the SOAP client instance $soapclient = new nusoapclient('http://sugar_root_url/service/v2/soap.php wsdl', true); // Login to the server $result = $soapclient->call('login',array('user_auth'=>array('user_name'=>$user_name,

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