ropes

This module contains support for a rope data type. Ropes can represent very long strings efficiently; especially concatenation is done in O(1) instead of O(n). They are essentially concatenation trees that are only flattened when converting to a native Nim string. The empty string is represented by nil. Ropes are immutable and subtrees can be shared without copying. Leaves can be cached for better memory efficiency at the cost of runtime efficiency.

Types

Rope = ref RopeObj
empty rope is represented by nil   Source Edit

Procs

proc len(a: Rope): int {...}{.gcsafe, extern: "nro$1", raises: [], tags: [].}
the rope's length   Source Edit
proc rope(s: string = ""): Rope {...}{.gcsafe, extern: "nro$1Str", raises: [], tags: [].}
Converts a string to a rope.   Source Edit
proc rope(i: BiggestInt): Rope {...}{.gcsafe, extern: "nro$1BiggestInt", raises: [], tags: [].}
Converts an int to a rope.   Source Edit
proc rope(f: BiggestFloat): Rope {...}{.gcsafe, extern: "nro$1BiggestFloat", raises: [],
                               tags: [].}
Converts a float to a rope.   Source Edit
proc enableCache() {...}{.gcsafe, extern: "nro$1", raises: [], tags: [].}
Enables the caching of leaves. This reduces the memory footprint at the cost of runtime efficiency.   Source Edit
proc disableCache() {...}{.gcsafe, extern: "nro$1", raises: [], tags: [].}
the cache is discarded and disabled. The GC will reuse its used memory.   Source Edit
proc `&`(a, b: Rope): Rope {...}{.gcsafe, extern: "nroConcRopeRope", raises: [], tags: [].}
the concatenation operator for ropes.   Source Edit
proc `&`(a: Rope; b: string): Rope {...}{.gcsafe, extern: "nroConcRopeStr", raises: [], tags: [].}
the concatenation operator for ropes.   Source Edit
proc `&`(a: string; b: Rope): Rope {...}{.gcsafe, extern: "nroConcStrRope", raises: [], tags: [].}
the concatenation operator for ropes.   Source Edit
proc `&`(a: openArray[Rope]): Rope {...}{.gcsafe, extern: "nroConcOpenArray", raises: [],
                                 tags: [].}
the concatenation operator for an openarray of ropes.   Source Edit
proc add(a: var Rope; b: Rope) {...}{.gcsafe, extern: "nro$1Rope", raises: [], tags: [].}
adds b to the rope a.   Source Edit
proc add(a: var Rope; b: string) {...}{.gcsafe, extern: "nro$1Str", raises: [], tags: [].}
adds b to the rope a.   Source Edit
proc `[]`(r: Rope; i: int): char {...}{.gcsafe, extern: "nroCharAt", raises: [], tags: [].}
returns the character at position i in the rope r. This is quite expensive! Worst-case: O(n). If i >= r.len, \0 is returned.   Source Edit
proc write(f: File; r: Rope) {...}{.gcsafe, extern: "nro$1", raises: [IOError],
                          tags: [WriteIOEffect].}
writes a rope to a file.   Source Edit
proc write(s: Stream; r: Rope) {...}{.gcsafe, extern: "nroWriteStream", raises: [Exception],
                            tags: [WriteIOEffect].}
writes a rope to a stream.   Source Edit
proc `$`(r: Rope): string {...}{.gcsafe, extern: "nroToString", raises: [], tags: [].}
converts a rope back to a string.   Source Edit
proc `%`(frmt: string; args: openArray[Rope]): Rope {...}{.gcsafe, extern: "nroFormat",
    raises: [ValueError], tags: [].}
% substitution operator for ropes. Does not support the $identifier nor ${identifier} notations.   Source Edit
proc addf(c: var Rope; frmt: string; args: openArray[Rope]) {...}{.gcsafe, extern: "nro$1",
    raises: [ValueError], tags: [].}
shortcut for add(c, frmt % args).   Source Edit
proc equalsFile(r: Rope; f: File): bool {...}{.gcsafe, extern: "nro$1File", raises: [IOError],
                                    tags: [ReadIOEffect].}
returns true if the contents of the file f equal r.   Source Edit
proc equalsFile(r: Rope; filename: string): bool {...}{.gcsafe, extern: "nro$1Str",
    raises: [IOError], tags: [ReadIOEffect].}
returns true if the contents of the file f equal r. If f does not exist, false is returned.   Source Edit

Iterators

iterator leaves(r: Rope): string {...}{.raises: [], tags: [].}
iterates over any leaf string in the rope r.   Source Edit
iterator items(r: Rope): char {...}{.raises: [], tags: [].}
iterates over any character in the rope r.   Source Edit