https://github.com/slince/expression-language

🚀 一个富有语言表现力的表达式引擎的 Java 实现
https://github.com/slince/expression-language

expression expression-engine expression-evaluator expression-language lexer parser

Last synced: 7 months ago
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🚀 一个富有语言表现力的表达式引擎的 Java 实现

• Host: GitHub
• URL: https://github.com/slince/expression-language
• Owner: slince
• License: apache-2.0
• Created: 2023-02-23T12:24:12.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2024-03-21T16:42:43.000Z (over 1 year ago)
• Last Synced: 2025-01-17T22:29:23.732Z (9 months ago)
• Topics: expression, expression-engine, expression-evaluator, expression-language, lexer, parser
• Language: Java
• Homepage:
• Size: 145 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Expression Language

一个富有语言表现力的表达式引擎 Java 实现。

[![Build Status](https://img.shields.io/github/actions/workflow/status/slince/expression-language/ci.yml?style=flat-square)](https://github.com/slince/expression-language/actions)

[![Maven Central](https://img.shields.io/maven-central/v/io.github.slince/expression?style=flat-square)](https://maven-badges.herokuapp.com/maven-central/io.github.slince/expression)

[![LICENSE](https://img.shields.io/github/license/slince/expression-language?style=flat-square)](https://www.apache.org/licenses/LICENSE-2.0.txt)

[English Documentation](./README_EN.md)

## 安装

```xml

    io.github.slince

    expression

    0.0.2-RELEASE

```

ObjectPath:

```xml

    io.github.slince

    expression-data-path

    0.0.2-RELEASE

```

ObjectPath 使用文档见[这里](./docs/zh_CN/objectpath.md)；

## 快速开始

```java

import io.github.slince.expression.Evaluator;

import io.github.slince.expression.MapContext;

import java.util.Arrays;

import java.util.List;

public class Book {

    

    public static void main(String[] args) {

        // 创建一本书实例

        Book book = new Book("The Lady of the Camellias", 12.89f, Arrays.asList("Love Story", "France", null));

        MapContext ctx = new MapContext();

        ctx.setVar("book", book);

        // 执行表达式

        // "The Lady of the Camellias"

        System.out.println(Evaluator.INSTANCE.evaluate("book.name", ctx));

        // 3

        System.out.println(Evaluator.INSTANCE.evaluate("book.tags|size", ctx));

        // 22.89f

        System.out.println(Evaluator.INSTANCE.evaluate("book.price + 10", ctx));

    }

    

    private final String name;

    private final float price;

    private final List tags;

    public Book(String name, float price, List tags) {

        this.name = name;

        this.price = price;

        this.tags = tags;

    }

    public String getName() {

        return name;

    }

    public float getPrice() {

        return price;

    }

    public List getTags() {

        return tags;

    }

} 

```

## 文档

更多文档请查看[详细文档](docs/zh_CN/index.md)

## 问题反馈

报告 Issue: [github issues](https://github.com/slince/expression/issues)

## LICENSE

The Apache 2.0 license. See [Apache-2.0](https://opensource.org/licenses/Apache-2.0)