缩进 Java 输出
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Indenting Java Output
提问by meteoritepanama
I am generating a graphviz DOT file in a Java program (here is a example of what one looks like: http://www.graphviz.org/Gallery/directed/cluster.html). I want to automatically indent this file based on the braces. Is there an easy way to do this in Java? Thanks!
我在 Java 程序中生成了一个 graphviz DOT 文件（这是一个示例：http: //www.graphviz.org/Gallery/directed/cluster.html）。我想根据大括号自动缩进这个文件。有没有一种简单的方法可以在 Java 中做到这一点？谢谢！
采纳答案by Steve B.
Nested contexts like this are really best expressed by stacks, but you can do a cheap version of this kind of parsing just by counting - it's not really "correct" in that it's not a full parser (for one thing, this doesn't take comments into account, and there's probably a few other ways it could break, like a name that includes a bracket), but good enough for a one-off:
像这样的嵌套上下文真的最好用堆栈来表达，但是你可以通过计数来做这种解析的廉价版本——它不是真正“正确”的，因为它不是一个完整的解析器（一方面，这不需要考虑到评论，并且可能还有其他一些方法可能会破坏它，例如包含括号的名称），但足以一次性使用：
psuedocode
伪代码
int indent=0;
for (line):
print ('\t' for each indent) + line
if (line.contains('{'))indent++
if (line.contains('}')} indent --;
If the lines are not already broken at the brackets as your sample output displays, iterate the lines by breaking the input on newlines, '{', or '}'.
如果示例输出显示的括号中的行尚未断开，请通过在换行符、'{' 或 '}' 上断开输入来迭代这些行。
回答by Jason Wang
I suppose there are various solutions for this question. Deponding on the requirement, you may want an elegent solution which may allow you to easily cumstimaze a template for the final output. Then you need to understand the graphviz file format and possibly identify code by blocks as nodes. Then the job is easy: output nodes(I mean the code reprenting the node) of depth i with indents = i*4 spaces.
我想这个问题有多种解决方案。根据要求，您可能需要一个优雅的解决方案，它可以让您轻松地为最终输出制作模板。然后你需要了解 graphviz 文件格式，并可能通过块作为节点来识别代码。然后工作很简单：输出节点（我的意思是代表节点的代码），缩进数为 i*4 空格。
Since I have no knowledge about the graphviz file, I probaly will simply treat it as a plain text file. So all you need to do is
由于我对 graphviz 文件一无所知，因此我可能会简单地将其视为纯文本文件。所以你需要做的就是
1. open the graph file,
2. create a temp file for the final output
3. set indent = 0.
4. read one line, if not null, search the line for braces, for every opening brace, ++indent
and --indent for every closing brace.
NOTE:you need to escape the escaped braces if there is any. say "{" or \{
5. write the line to the temp file with preceding spaces = 4*indent (assuming you want 4 spaces for every indent)
6. close both files. if needed, replace the old file with the temp file.
As I probably do not understand your equestion correctly, the pseudocode could be useless functionwise. But you got the idea ;-)
由于我可能没有正确理解您的问题，因此伪代码在功能上可能毫无用处。但你明白了;-)
