syntax - 任何地方都有 Cypher 语法定义吗？

Question

我正在寻找 Cypher 查询语言的语法定义。我试过 the docs但它们非常模糊。

理想情况下，我想要一个 BNF(或任何变体)定义，或者像 this 这样的“图形”定义之一。或 this .真的，任何类似于正式定义的东西。

Answer 1

您正在寻找的内容将在 中提供openCypher .作为项目的一部分，将发布几个项目，其中第一个是 BNF 语法。

2016 年 1 月 30 日更新:语法的初稿现在可以在\https://github.com/opencypher/openCypher/blob/master/grammar.ebnf 获得。

更新:2016-10-17:EBNF 和 Antlr 语法、TCK、铁路图和社区项目列表可在 http://www.opencypher.org/#resources 获得。

看看 recently announced (2015 年 10 月) openCypher project .它涉及发布语言规范等。

从公告:

1. Cypher reference documentation: A comprehensive user documentation describing use of the Cypher query language with examples and tutorials.

2. Technology compatibility kit (TCK): The TCK consists of a number of tests that a software supplier would run in order to self-certify support for a given version of Cypher.

3. Reference implementation: Distributed under the Apache 2.0 license, the reference implementation is a fully functional implementation of key parts of the stack needed to support Cypher inside a data platform or tool. The first planned deliverable is a parser that will take a Cypher statement and parse it into an AST (abstract syntax tree) representation. The reference implementation complements the documentation and tests by providing working implementations of Cypher – which are permissively licensed – and can be used as examples or as a foundation for one’s own implementation.

4. Cypher language specification: Licensed under a Creative Commons license, the Cypher language specification is a technical expression of the language syntax to enable parsers to auto-generate the query syntax. A full semantic specification is also planned as a part of the openCypher project.

同一份公告还表示，该流程是开放的，可以提交、审查和评论语言提案。