val init : string -> Lexing.lexbuf -> Lexing.lexbufinit filename lexbuf initializes the lexing buffer lexbuf so that the positions that are subsequently read from it refer to the file filename. It returns lexbuf.
val read : string -> string * Lexing.lexbufread filename reads the entire contents of the file filename and returns a pair of this content (a string) and a lexing buffer that has been initialized, based on this string.
val newline : Lexing.lexbuf -> unitnewline lexbuf increments the line counter stored within lexbuf. It should be invoked by the lexer itself every time a newline character is consumed. This allows maintaining a current the line number in lexbuf.
val range : (Lexing.position * Lexing.position) -> stringrange (startpos, endpos) prints a textual description of the range delimited by the start and end positions startpos and endpos. This description is one line long and ends in a newline character. This description mentions the file name, the line number, and a range of characters on this line. The line number is correct only if newline has been correctly used, as described dabove.
tabulate is_eof lexer tabulates the lexer lexer: that is, it immediately runs this lexer all the way until an EOF token is found, stores the tokens in an array in memory, and returns a new lexer which (when invoked) reads tokens from this array. The function lexer is not allowed to raise an exception, and must produce a finite stream of tokens: that is, after a finite number of invocations, it must return a token that is identified by the function is_eof as an EOF token.
Both the existing lexer lexer and the new lexer returned by tabulate
is_eof lexer are functions of type unit -> 'a, where the type 'a is likely to be instantiated with a triple of a token and two positions, as per the revised lexer API described in the module Convert.