java 如何为 ANTLR 指定目标包？
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How to specify a target package for ANTLR?
提问by tangens
If I call:
如果我打电话：
java org.antlr.Tool -o outdir sources/com/example/Java5.g
...with antlr-3.1.3 the parser and lexer code will be generated in the directory outdir/sources/com/example. But the generated classes don't have any packagestatement. I need them to life in the package com.example.
...使用 antlr-3.1.3，解析器和词法分析器代码将在目录中生成outdir/sources/com/example。但是生成的类没有任何package声明。我需要它们在包裹中存活com.example。
Is there a way to specify the target package?
有没有办法指定目标包？
回答by peter.murray.rust
ANTLR provides a header tool which allows you to include package and imports. You include this in your *.g grammar file:
ANTLR 提供了一个头文件工具，允许您包含包和导入。您将其包含在 *.g 语法文件中：
@header {
package org.xmlcml.cml.converters.antlr;
import java.util.HashMap;
}
And you may need it in the Lexer as well:
您可能也需要在 Lexer 中使用它：
@lexer::header {package org.xmlcml.cml.converters.antlr;}
and in case you need to add some members and code:
如果您需要添加一些成员和代码：
@members {
HashMap<String, Object> objectMap = new HashMap<String, Object>();
//...
private void addArrayValue(String content) {
//... code required by snippets in the grammar
}
}
回答by kmp
An old question with a perfectly good answer, but since the comment on the question asked for a command line option (and that was what I was actually searching for when I got here), I thought I'd just chime in and say the following...
一个老问题，答案非常好，但是由于对该问题的评论要求提供命令行选项（这就是我到达这里时实际搜索的内容），我想我会插嘴说以下内容...
You can specifiy the package on the command line if you are using ANTLR 4. I checkedand it seems to not be there in version 3 so the otheranswer is the way to go for ANTLR 3.
如果您使用的是 ANTLR 4，您可以在命令行上指定该包。我检查过，它似乎不在版本 3 中，所以另一个答案是 ANTLR 3 的方法。
Here is an example:
下面是一个例子：
java -cp antlr-4.4-complete.jar org.antlr.v4.Tool -package my.package MyGram.g4
See the -packageoption at ANTLR Tool Command Line Optionsfor more information.
见-package在选择ANTLR工具命令行选项的详细信息。
