package rope

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This is similar to the Buffer module in the standard library except that it constructs ropes. It is recommended to use this module instead of repeatedly concatenating chars.

type t

Mutable buffer to construct ropes.

val create : int -> t

create n returns a fresh buffer, initially empty. The n parameter is the initial size of the internal rope that holds the buffer contents. The buffer will grow dynamically to accomodate new inputs.

val clear : t -> unit

Empty the buffer.

val reset : t -> unit

Empty the buffer.

val length : t -> int

Return the number of characters currently contained in the buffer.

val add_char : t -> char -> unit

add_char b c appends the character c at the end of the buffer b.

  • raises Failure

    if the length if the buffer exceeds max_int.

val add_string : t -> string -> unit

add_string b s appends the string s at the end of the buffer b.

  • raises Failure

    if the length if the buffer exceeds max_int.

val add_substring : t -> string -> int -> int -> unit

add_substring b s ofs len takes len characters from offset ofs in string s and appends them at the end of the buffer b.

  • raises Failure

    if the length if the buffer exceeds max_int.

val add_rope : t -> rope -> unit

add_rope b r add the rope r to the buffer b.

val add_channel : t -> in_channel -> int -> unit

add_channel b ic n reads exactly n characters from the input channel ic and stores them at the end of buffer b.

  • raises End_of_file

    if the channel contains fewer than n characters.

val add_buffer : t -> t -> unit

add_buffer b1 b2 appends the current contents of buffer b2 at the end of buffer b1. b2 is not modified.

val contents : t -> rope

Return a copy of the current contents of the buffer. The buffer itself is unchanged.

val sub : t -> int -> int -> rope

sub b off len returns a rope of the current contents of the buffer b starting at offset off of length len bytes. The buffer itself is unaffected.

val nth : t -> int -> char

nth b i returns the ith character if the buffer.

  • raises Out_of_bounds

    if i < 0 or i >= length b. Time: O(log(length b)).

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