fuzzy

package module
Version: v0.1.0 Latest Latest
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Published: Sep 1, 2018 License: MIT Imports: 3 Imported by: 102

README

gopher looking for stuff gopher found stuff

fuzzy

Build Status Documentation

Go library that provides fuzzy string matching optimized for filenames and code symbols in the style of Sublime Text, VSCode, IntelliJ IDEA et al. This library is external dependency-free. It only depends on the Go standard library.

Features

  • Intuitive matching. Results are returned in descending order of match quality. Quality is determined by:

    • The first character in the pattern matches the first character in the match string.
    • The matched character is camel cased.
    • The matched character follows a separator such as an underscore character.
    • The matched character is adjacent to a previous match.
  • Speed. Matches are returned in milliseconds. It's perfect for interactive search boxes.

  • The positions of matches is returned. Allows you to highlight matching characters.

  • Unicode aware.

Demo

Here is a demo of matching various patterns against ~16K files from the Unreal Engine 4 codebase.

demo

You can run the demo yourself like so:

cd _example/
go get github.com/jroimartin/gocui
go run main.go

Usage

The following example prints out matches with the matched chars in bold.

package main

import (
	"fmt"

	"github.com/sahilm/fuzzy"
)

func main() {
	const bold = "\033[1m%s\033[0m"
	pattern := "mnr"
	data := []string{"game.cpp", "moduleNameResolver.ts", "my name is_Ramsey"}

	matches := fuzzy.Find(pattern, data)

	for _, match := range matches {
		for i := 0; i < len(match.Str); i++ {
			if contains(i, match.MatchedIndexes) {
				fmt.Print(fmt.Sprintf(bold, string(match.Str[i])))
			} else {
				fmt.Print(string(match.Str[i]))
			}
		}
		fmt.Println()
	}
}

func contains(needle int, haystack []int) bool {
	for _, i := range haystack {
		if needle == i {
			return true
		}
	}
	return false
}

If the data you want to match isn't a slice of strings, you can use FindFromSource by implementing the provided Source interface. Here's an example:

package main

import (
	"fmt"

	"github.com/sahilm/fuzzy"
)

type employee struct {
	name string
	age  int
}

type employees []employee

func (e employees) String(i int) string {
	return e[i].name
}

func (e employees) Len() int {
	return len(e)
}

func main() {
	emps := employees{
		{
			name: "Alice",
			age:  45,
		},
		{
			name: "Bob",
			age:  35,
		},
		{
			name: "Allie",
			age:  35,
		},
	}
	results := fuzzy.FindFrom("al", emps)
	fmt.Println(results)
}

Check out the godoc for detailed documentation.

Installation

go get github.com/sahilm/fuzzy or use your favorite dependency management tool.

Speed

Here are a few benchmark results on a normal laptop.

BenchmarkFind/with_unreal_4_(~16K_files)-4         	     100	  12915315 ns/op
BenchmarkFind/with_linux_kernel_(~60K_files)-4     	      50	  30885038 ns/op

Matching a pattern against ~60K files from the Linux kernel takes about 30ms.

Contributing

Everyone is welcome to contribute. Please send me a pull request or file an issue. I promise to respond promptly.

Credits

  • @ericpauley & @lunixbochs contributed Unicode awareness and various performance optimisations.

  • The algorithm is based of the awesome work of forrestthewoods. See this blog post for details of the algorithm.

  • The artwork is by my lovely wife Sanah. It's based on the Go Gopher.

  • The Go gopher was designed by Renee French (http://reneefrench.blogspot.com/). The design is licensed under the Creative Commons 3.0 Attributions license.

License

The MIT License (MIT)

Copyright (c) 2017 Sahil Muthoo

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Documentation

Overview

Package fuzzy provides fuzzy string matching optimized for filenames and code symbols in the style of Sublime Text, VSCode, IntelliJ IDEA et al.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Match

type Match struct {
	// The matched string.
	Str string
	// The index of the matched string in the supplied slice.
	Index int
	// The indexes of matched characters. Useful for highlighting matches.
	MatchedIndexes []int
	// Score used to rank matches
	Score int
}

Match represents a matched string.

type Matches added in v0.0.4

type Matches []Match

Matches is a slice of Match structs

func Find

func Find(pattern string, data []string) Matches

Find looks up pattern in data and returns matches in descending order of match quality. Match quality is determined by a set of bonus and penalty rules.

The following types of matches apply a bonus:

* The first character in the pattern matches the first character in the match string.

* The matched character is camel cased.

* The matched character follows a separator such as an underscore character.

* The matched character is adjacent to a previous match.

Penalties are applied for every character in the search string that wasn't matched and all leading characters upto the first match.

func FindFrom added in v0.1.0

func FindFrom(pattern string, data Source) Matches

FindFrom is an alternative implementation of Find using a Source instead of a list of strings.

func (Matches) Len added in v0.0.4

func (a Matches) Len() int

func (Matches) Less added in v0.0.4

func (a Matches) Less(i, j int) bool

func (Matches) Swap added in v0.0.4

func (a Matches) Swap(i, j int)

type Source added in v0.1.0

type Source interface {
	// The string to be matched at position i.
	String(i int) string
	// The length of the source. Typically is the length of the slice of things that you want to match.
	Len() int
}

Source represents an abstract source of a list of strings. Source must be iterable type such as a slice. The source will be iterated over till Len() with String(i) being called for each element where i is the index of the element. You can find a working example in the README.

Source Files

Directories

Path Synopsis

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