module Scanning: sig .. end
Scanning buffers.
type
The type of scanning buffers. A scanning buffer is the argument passed
to the scanning functions used by the scanf family of functions.
The scanning buffer holds the current state of the scan, plus
a function to get the next char from the input, and a token buffer
to store the string matched so far.
val stdib : scanbuf
The scanning buffer reading from stdin.
stdib is equivalent to Scanning.from_channel stdin.
val from_string : string -> scanbuf
Scanning.from_string s returns a scanning buffer which reads
from the given string.
Reading starts from the first character in the string.
The end-of-input condition is set when the end of the string is reached.
val from_file : string -> scanbuf
Bufferized file reading in text mode. The efficient and usual
way to scan text mode files (in effect, from_file returns a
buffer that reads characters in large chunks, rather than one
character at a time as buffers returned by from_channel do).
Scanning.from_file fname returns a scanning buffer which reads
from the given file fname in text mode.
val from_file_bin : string -> scanbuf
Bufferized file reading in binary mode.
val from_function : (unit -> char) -> scanbuf
Scanning.from_function f returns a scanning buffer with
the given function as its reading method.
When scanning needs one more character, the given function is called.
When the function has no more character to provide, it must signal
an end-of-input condition by raising the exception End_of_file.
val from_channel : in_channel -> scanbuf
Scanning.from_channel inchan returns a scanning buffer which reads
one character at a time from the input channel inchan, starting at the
current reading position.
val end_of_input : scanbuf -> bool
Scanning.end_of_input scanbuf tests the end of input condition
of the given buffer.
val beginning_of_input : scanbuf -> bool
Scanning.beginning_of_input scanbuf tests the beginning of input
condition of the given buffer.