https://github.com/johnpatrickmorgan/sparse

Sparse is a simple parser-combinator library written in Swift.
https://github.com/johnpatrickmorgan/sparse

cocoapods ios macos parser spm swift

Last synced: about 1 month ago
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Sparse is a simple parser-combinator library written in Swift.

• Host: GitHub
• URL: https://github.com/johnpatrickmorgan/sparse
• Owner: johnpatrickmorgan
• License: mit
• Created: 2017-01-12T22:04:06.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2019-11-07T17:07:40.000Z (about 5 years ago)
• Last Synced: 2024-09-29T11:25:40.918Z (about 1 month ago)
• Topics: cocoapods, ios, macos, parser, spm, swift
• Language: Swift
• Size: 64.5 KB
• Stars: 115
• Watchers: 4
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# ✂️ Sparse ✂️

[![Version](https://img.shields.io/cocoapods/v/Sparse.svg?style=flat)](http://cocoapods.org/pods/Sparse)

[![License](https://img.shields.io/cocoapods/l/Sparse.svg?style=flat)](http://cocoapods.org/pods/Sparse)

![Swift](https://img.shields.io/badge/Swift-5.1-orange.svg)

Sparse is a simple parsing library, written in Swift. It is based on the parser-combinator approach used by Haskell's [Parsec](https://github.com/aslatter/parsec). Its focus is on natural language parser creation and descriptive error messages.

## Example

Here is a CSV parser:

```swift

let quote = character("\"")

let illegalCellCharacters = CharacterSet.newlines.union(CharacterSet(charactersIn: ","))

let unquotedCellCharacter = characterNot(in: illegalCellCharacters)

    .named("cell character")

let unquotedCell = many(unquotedCellCharacter).asString()

    .map { $0.trimmingCharacters(in: .whitespaces) }

let escapedQuote = quote.skipThen(quote)

    .named("escaped quote")

let quotedCellCharacter = characterNot("\"")

    .named("quoted cell character")

    .otherwise(escapedQuote)

let quotedCell = many(quotedCellCharacter, boundedBy: quote).asString()

let cell = quotedCell.otherwise(unquotedCell)

let cellSeparator = whitespaces().then(character(",")).then(whitespaces())

    .named("cell separator")

let line = many(cell, separator: cellSeparator)

let ending = optional(newline()).then(end())

let csv = many(line, separator: newline()).thenSkip(ending)

public func parseCSV(input: String) throws -> [[String]] {

    return try csv.parse(input)

}

```

Naming the component parsers allows for more descriptive error messages, e.g.:

    Line 8, Column 12

    r8c1 , "r8"c2" , r8c3 ,r8c4,r8c5,r8c6,r8c7 , r8c8

    ~~~~~~~~~~~^

    Expected: '"' in escaped quote

    Expected: whitespace in cell separator

    Expected: ',' in cell separator

    Expected: newline

    Expected: EOF: file

## Installation

### Swift Package Manager

Add Sparse as a dependency in Package.swift:

```swift

.package(url: "https://github.com/johnpatrickmorgan/sparse.git", from: "0.3.0"),

```

### CocoaPods

Add the following line to your Podfile:

```ruby

pod "Sparse"

```

## Credit

Sparse is based on Haskell's [Parsec](https://github.com/aslatter/parsec).

## License

Sparse is available under the MIT license. See the LICENSE file for more info.