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[Usage](#usage)\n- [Utils](#utils)\n  - [Parser](#parser)\n  - [Node](#node)\n- [TODO](#todo)\n\n## What is this?\n\n`syntax-based-completion` is a [React Component](react-component) (Form Input) that allows you to define a [BNF](bnf) syntax to validate the input value and suggest anything based on the syntax.\n\nCheck the [demo](demo).\n\n## BNF\n\n\u003e In computer science, Backus–Naur form or Backus normal form (BNF) is a notation technique for context-free grammars, often used to describe the syntax of languages used in computing, such as computer programming languages, document formats, instruction sets and communication protocols. They are applied wherever exact descriptions of languages are needed: for instance, in official language specifications, in manuals, and in textbooks on programming language theory.\nSource [Wikipedia](bnf)\n\n## Installation\n\nThe component is available trought npm and depends of [`ebnf`](node-ebnf):\n\n```bash\nnpm install --save ebnf\nnpm install --save syntax-based-completion\n```\n\n## Usage\n\n```javascript\n\u003cSuggestionInput\n  placeholder=\"Start typing...\"\n  syntax={`\n  \u003cSYNTAX\u003e    ::= \u003cequation\u003e\n  \u003cequation\u003e  ::= \u003cnumber\u003e \u003coperation\u003e \u003cnumber\u003e\n  \u003coperation\u003e ::= \"+\" | \"-\" | \"/\" | \"*\"\n  \u003cnumber\u003e    ::= \u003cDIGITS\u003e\n  \u003cDIGITS\u003e    ::= \u003cDIGIT\u003e \u003cDIGITS\u003e | \u003cDIGIT\u003e\n  \u003cDIGIT\u003e     ::= \"0\" | \"1\" | \"2\" | \"3\" | \"4\" | \"5\" | \"6\" | \"7\" | \"8\" | \"9\"\n  `}\n  fetchSuggestions={({ type }) =\u003e new Promise((resolve) =\u003e resolve(type === 'operation' ? [\"+\", \"-\", \"/\", \"*\"] || []))}\n/\u003e\n```\n\nBy default, the component accepts the same properties of a `input`, with some extras:\n\n### Properties\n\n### syntax\n\nA string with the BNF syntax description\n\n``` ebnf\n  \u003cSYNTAX\u003e    ::= \u003cequation\u003e\n  \u003cequation\u003e  ::= \u003cnumber\u003e \u003coperation\u003e \u003cnumber\u003e\n  \u003coperation\u003e ::= \"+\" | \"-\" | \"/\" | \"*\"\n  \u003cnumber\u003e    ::= \u003cDIGITS\u003e\n  \u003cDIGITS\u003e    ::= \u003cDIGIT\u003e \u003cDIGITS\u003e | \u003cDIGIT\u003e\n  \u003cDIGIT\u003e     ::= \"0\" | \"1\" | \"2\" | \"3\" | \"4\" | \"5\" | \"6\" | \"7\" | \"8\" | \"9\"\n```\n\nObs: UPPER_SNAKE_CASES definitions will be ignored on parser, improving performance.\n\n### onChange()\n\n``` javascript\nonChange(newValue, currentNode)\n```\n\n\n### fetchSuggestions()\n\n``` javascript\nfetchSuggestions(currentNode) =\u003e Promise\n```\n\nThe property `fetchSuggestions` is called when the cursor position or the value changes.\nThe function expects a promise that should `resolve` a list of suggestions or `reject` with a error message.\n\n## Utils\n\n### Parser\n\n`Parser` is a helper class that allows you to work with the BNF parser without the component:\n\n``` javascript\nimport { Parser } from 'syntax-based-completion';\n\nconst parser = new Parser(SYNTAX)\nconst output = parser.parse(text)\n```\n\n#### constructor()\n\nRespects [ebnf](node-ebnf) `Parser` constructor.\n\n#### parse()\n\n``` javascript\nnew Parser(SYNTAX).parse(\"My Text\");\n```\n\nReturns a [Node](#node).\n\n### Node\n\n`Node` is a helper class that allows you to traverse a BNF node and its parents/children.\n\n#### constructor()\n\nRespects [ebnf](node-ebnf) `IToken` constructor.\n\n#### findChildByPosition()\n\n``` javascript\nnode.findChildByPosition(12)\n```\n\nReturns the child [Node](#node) matching the length position in the string or `itself`.\n\n#### findChildByType()\n\n``` javascript\nnode.findChildByType('operator')\n```\n\nReturns the first child [Node](#node) (or its children) matching the specified type or `false`.\n\n#### findParentByType()\n\n``` javascript\nnode.findParentByType('word')\n```\n\nReturns the first parent [Node](#node) (or its parent) matching the specified type or `itself`.\n\n\n## TODO\n\n- Allow node deletion with `Shift+backspace`;\n- Allow selection replacement;\n- Text styling;\n\n[demo]: https://jrfferreira.github.io/syntax-based-completion/demo/dist/\n[react-component]: https://reactjs.org/docs/react-component.html\n[node-ebnf]: https://github.com/lys-lang/node-ebnf\n[bnf]: https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form\n[build-badge]: https://circleci.com/gh/jrfferreira/syntax-based-completion.svg?style=svg\n[build]: https://circleci.com/gh/jrfferreira/syntax-based-completion\n[npm-badge]: https://img.shields.io/npm/v/syntax-based-completion.png?style=flat-square\n[npm]: https://www.npmjs.org/package/syntax-based-completion\n[coveralls-badge]: https://img.shields.io/coveralls/jrfferreira/syntax-based-completion/master.png?style=flat-square\n[coveralls]: https://coveralls.io/github/jrfferreira/syntax-based-completion\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjrfferreira%2Fsyntax-based-completion","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjrfferreira%2Fsyntax-based-completion","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjrfferreira%2Fsyntax-based-completion/lists"}