36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
# Brolib-sml
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## Introduction
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Standard ML port of [this](https://github.com/hummy123/brolib) rope implementation.
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This particular rope uses the balancing scheme described in the [Purely Functional 1-2 Brother Trees paper authored by Ralph Hinze](https://www.cs.ox.ac.uk/ralf.hinze/publications/Brother12.pdf). It tries to keep the number of nodes to a minimum by joining the strings in adjacent leaf nodes, if joining would not be too expensive.
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## Usage
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The two files are `rope.sml` and `tiny_rope.sml`.
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`rope.sml` contains a rope that tracks line metadata (which has a small performance and memory penalty). This is useful if you have line-based operations in mind.
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`tiny_rope.sml` doesn't track line metadata, and is useful when line-queries aren't needed.
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Except for those line-based operations marked below, all functions are the same between the two.
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### Examples
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#### Initialise
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`val rope = Rope.fromString "hello, world!"`
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It's best to use a string with a length less than or equal to 1024 for performance reasons. (The point of a rope is to represent a large string using a binary tree that contains smaller pieces.)
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#### Convert to string
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`val str = Rope.toString rope`
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This is a function that is better to avoid.
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#### Insert
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`Rope.insert(0, "hello, world!")`
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