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The operations of the lexer are performed on a structure called a lexbuf, which is a structure with fields that have a lot of information about the state of the current buffer. This includes the current position (lex_curr_pos), which is an integer showing the number of characters from the beginning. There is also a field that indicates whether the end of the file has been reached (lex_eof_reached). type lexbuf = { refill_buff : lexbuf -> unit; mutable lex_buffer : string; mutable lex_buffer_len : int; mutable lex_abs_pos : int; mutable lex_start_pos : int; mutable lex_curr_pos : int; mutable lex_last_pos : int; mutable lex_last_action : int; mutable lex_eof_reached : bool; mutable lex_mem : int array; mutable lex_start_p : position; mutable lex_curr_p : position; } You do not normally interact with a lexbuf yourself (except perhaps for the position fields); instead, you use the functions found in the lexing library, which provides functions that perform operations on lexbuf structures (discussed a bit later).

The open() method also accepts a fourth and fifth parameter (username and password for secured situations), but we ll not be using those within the context of this example. The second XmlHttpRequest call that we want to take note of is as follows: xmlhttp.onreadystatechange = function() { if(xmlhttp.readyState == 4) { alert(xmlhttp.responseText); } } The vital portion of this call is the onreadystatechange() method. This interesting, but small, function allows the client side to monitor the current state of the asynchronous call. If the state of the XmlHttpRequest call process changes, this event will be triggered, and any assigned function will be called. In our case, we ve created an inline function to be run on the aforementioned trigger. Within that function, we identify exactly what the readyState that we ve been monitoring has been changed to and determine our next course of action. There are five possible values for this state: 0 = Uninitialized 1 = Loading 2 = Loaded 3 = Interactive 4 = Complete Of interest to us is the complete value, 4. This status indicates that our request has made the complete trip. But what happens if our destination isn t there It s possible that a network issue could disrupt the chain of events. Let s re-create a similar situation by renaming our text file to TextFile2.txt and then running the application. We re seeking out a resource that does not exist, and the application will render a message with a certain ugliness, as shown in Figure 3-6.

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end end body do h1 '' table do weeks.each do |week| tr do th :style=>"vertical-align:top;" do p "Week \##{week[:week_number]}, #{week[:year]}" end td do div :class=>:weekday_bar, :style=>"width:" << ((week[:weekday_amount] / max_gross * 199 ) + 1).to_s do " " end span "Week - $#{'%0.2f' % week[:weekday_amount]}" end end tr do td "" td do div :class=>:weekend_bar, :style=>"width: " << ((week[:weekend_amount] / max_gross * 199) + 1 ).to_s do ' ' end span "Weekend - $#{'%0.2f' % week[:weekend_amount]}" end end end end end end end puts mab

Creating Lexing Buffers Lexing buffers can be created from strings using the from_string function and from input channels using the from_channel function. They also can be created from functions. The from_function creates a buffer that passes a string and an integer to the function when more data should be read. The integer specifies the maximum number of characters that should be put into the string passed, and the function should return the actual number of characters. Positions A position is a type that describes a specific location in a source. If there is a filename, it is stored in pos_fname; otherwise, it is blank. The pos_lnum is the line number the position is at, and pos_bol is the position of the beginning of the current line. The pos_cnum is the absolute position (in characters) of the current buffer. The absolute position is indexed from 0. type position = { pos_fname : string; pos_lnum : int; pos_bol : int; pos_cnum : int; } There are functions that return positions from a lexbuf. These functions (Lexing.lexeme_ start_p and Lexing.lexeme_end_p) return the position of a match start or end. These functions are normally used in ocamllex semantic actions. You should understand that only the pos_cnum file is actually updated by the lexer. If you want the other fields to be accurate, you must update them yourself. The fields in the position structure are not mutable, but the fields in the lexbuf are. So if you want to update this information, you must update it in the lexbuf instead of updating the position. This is discussed in more detail in upcoming examples; just keep this information in mind.

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