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https://github.com/gitbookio/rousseau

Lightweight proofreader in JS
https://github.com/gitbookio/rousseau

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Lightweight proofreader in JS

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![Rousseau](./preview.jpg)

[![Build Status](https://travis-ci.org/GitbookIO/rousseau.png?branch=master)](https://travis-ci.org/GitbookIO/rousseau)
[![NPM version](https://badge.fury.io/js/rousseau.svg)](http://badge.fury.io/js/rousseau)

Rousseau is a lightweight proofreader written in Javascript, it can be used in Node.JS, in the command line and in the browser.

### Installation

```
$ npm install rousseau
```

### API

```js
var rousseau = require("rousseau");

rousseau('So the cat was stolen.', function(err, results) {
...
});
```

`results` is an array of object like:

```js
{
// Type of check that output this suggestion
type: "so",

// Level of importance
// "suggestion", "warning", "error"
level: "warning",

// Index in the text
index: 10,

// Size of the section in the text
offset: 2,

// Message to describe the suggestion
message: "omit 'So' from the beginning of sentences",

// Replacements suggestion
replacements: [
{
value: ""
}
]
}
```

### Checks

You can disable any combination of the following by providing a key with value `false` as option `checks` to `rousseau`.

##### English

| ID | Description |
| ----- | --------------- |
| `passive` | Checks for passive voice |
| `lexical-illusion` | Checks for lexical illusions – cases where a word is repeated. |
| `so` | Checks for `so` at the beginning of the sentence. |
| `adverbs` | Checks for adverbs that can weaken meaning: really, very, extremely, etc. |
| `readibility` | Checks for readibility of sentences. |
| `simplicity` | Checks for simpler expressions |
| `weasel` | Checks for "weasel words." |
| `sentence:start` | Checks that sentence is preceded by a space |
| `sentence:end` | Checks that there is no space between a sentence and its ending punctuation |
| `sentence:uppercase` | Checks that sentences are starting with uppercase letter |

### Extend Rousseau

Example: Extend rousseau with a Spellchecker.

```js
rousseau("Some text", {
checks: {
spelling: rousseau.tokenize.check([
rousseau.tokenize.words(),
rousseau.filter(function(word) {
return wordIsValid(word);
}),
rousseau.define({
level: rousseau.levels.ERROR,
message: "Spelling error"
})
])
}
}, function(err, results) {
...
})

```

### Cache

Rousseau use an internal cache for certain operations (tokenization, spellchecking, ...); this cache can be configured using the option `cache`:

```js
rousseau('So the cat was stolen.', {
cache: 100 // A maximum of 100 elements will be stored in the memory cache
}, function(err, results) {
...
});
```

### Contributing

We'd love to accept your patches and contributions to improve Rousseau (supported languages, checks, ...). Learn more about how to contribute in [CONTRIBUTING.md](./CONTRIBUTING.md).