Module Batteries.Buffer

The abstract type of buffers.

create n returns a fresh buffer, initially empty. The n parameter is the initial size of the internal string that holds the buffer contents. That string is automatically reallocated when more than n characters are stored in the buffer, but shrinks back to n characters when reset is called. For best performance, n should be of the same order of magnitude as the number of characters that are expected to be stored in the buffer (for instance, 80 for a buffer that holds one output line). Nothing bad will happen if the buffer grows beyond that limit, however. In doubt, take n = 16 for instance. If n is not between 1 and Sys.max_string_length, it will be clipped to that interval.

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

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

Buffer.sub b off len returns a copy of len bytes from the current contents of the buffer b, starting at offset off.

Raise Invalid_argument if srcoff and len do not designate a valid range of b.

Buffer.blit src srcoff dst dstoff len copies len characters from the current contents of the buffer src, starting at offset srcoff to string dst, starting at character dstoff.

get the n-th character of the buffer.

Return the number of characters currently contained in the buffer.

Empty the buffer.

Empty the buffer and deallocate the internal string holding the buffer contents, replacing it with the initial internal string of length n that was allocated by Buffer.create n. For long-lived buffers that may have grown a lot, reset allows faster reclamation of the space used by the buffer.

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

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

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

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.

add_subbytes b s ofs len takes len characters from offset ofs in byte sequence s and appends them at the end of the buffer b.

add_substitute b f s appends the string pattern s at the end of the buffer b with substitution. The substitution process looks for variables into the pattern and substitutes each variable name by its value, as obtained by applying the mapping f to the variable name. Inside the string pattern, a variable name immediately follows a non-escaped $ character and is one of the following:

• a non empty sequence of alphanumeric or _ characters,
• an arbitrary sequence of characters enclosed by a pair of matching parentheses or curly brackets. An escaped $ character is a $ that immediately follows a backslash character; it then stands for a plain $.

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

add_input b ic n reads exactly n character from the input ic and stores them at the end of buffer b.

output_buffer b creates an output channel that writes to that buffer, and when closed, returns the contents of the buffer.

truncate b len truncates the length of b to len Note: the internal byte sequence is not shortened. Raises Invalid_argument if len < 0 or len > length b.

add_utf_8_uchar b u appends the UTF-8 encoding of u at the end of buffer b.

add_utf_16le_uchar b u appends the UTF-16LE encoding of u at the end of buffer b.

add_utf_16be_uchar b u appends the UTF-16BE encoding of u at the end of buffer b.

Returns an enumeration of the characters of a buffer.

Contents of the enumeration is unspecified if the buffer is modified after the enumeration is returned.

Creates a buffer from a character enumeration.

Iterate on the buffer, in increasing order. Modification of the buffer during iteration is undefined behavior.

Iterate on the buffer, in increasing order, yielding indices along chars. Modification of the buffer during iteration is undefined behavior.

Add chars to the buffer

Create a buffer from the generator

add_uint8 b i appends a binary unsigned 8-bit integer i to b.

add_int8 b i appends a binary signed 8-bit integer i to b.

add_uint16_ne b i appends a binary native-endian unsigned 16-bit integer i to b.

add_uint16_be b i appends a binary big-endian unsigned 16-bit integer i to b.

add_uint16_le b i appends a binary little-endian unsigned 16-bit integer i to b.

add_int16_ne b i appends a binary native-endian signed 16-bit integer i to b.

add_int16_be b i appends a binary big-endian signed 16-bit integer i to b.

add_int16_le b i appends a binary little-endian signed 16-bit integer i to b.

add_int32_ne b i appends a binary native-endian 32-bit integer i to b.

add_int32_be b i appends a binary big-endian 32-bit integer i to b.

add_int32_le b i appends a binary little-endian 32-bit integer i to b.

add_int64_ne b i appends a binary native-endian 64-bit integer i to b.

add_int64_be b i appends a binary big-endian 64-bit integer i to b.

add_int64_ne b i appends a binary little-endian 64-bit integer i to b.