使用Ant脚本过滤器对行进行计数 [英] Using Ant scriptfilter to count lines
问题描述
我正在尝试编写Ant <scriptfilter...>
,以将字符串"__LINE__"
的出现更改为Java源文件中的正确行号.
I am trying to write an Ant <scriptfilter...>
to change occurrences of the string "__LINE__"
to the correct line number in Java source files.
有人有使用JavaScript(或其他嵌入式脚本语言)来执行此操作的示例吗?特别是,如何创建一个全局"变量,该变量在脚本启动时初始化为1
,并随每行新行递增?
Does anyone have an example of using JavaScript (or some other embedded scripting language) to do this? In particular, how do I create a "global" variable that is initialized to 1
when the script starts and is incremented with each new line?
谢谢.
更新:刚刚尝试了Martin Clayton提供的解决方案(谢谢!),用Beanshell替换了JavaScript,并且效果很好.这是Ant目标代码:
UPDATE: Just tried the solution offered by Martin Clayton (thanks!), replacing the JavaScript with Beanshell, and it worked perfectly. Here is the Ant target code:
<target name="preprocess" depends="ivy.resolve" description="Preprocess the source code">
<mkdir dir="${target.source.dir}"/>
<copy todir="${target.source.dir}" includeemptydirs="true" failonerror="true" verbose="true">
<fileset dir="${src.dir}"/>
<filterchain>
<tokenfilter>
<filetokenizer/>
<scriptfilter language="beanshell" byline="true" setbeans="true"><![CDATA[
import java.io.BufferedReader;
import java.io.StringReader;
int count = 1;
BufferedReader br = new BufferedReader(new StringReader(self.getToken()));
StringBuilder builder = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
builder.append(line.replace("\"__LINE__\"", Integer.toString(count))).append('\n');
count++;
}
self.setToken(builder.toString());
]]></scriptfilter>
</tokenfilter>
</filterchain>
</copy>
</target>
推荐答案
您可以使用ant属性来保存静态".
You could use an ant property to hold the 'static'.
这是一个非常简化的示例,用于一个文件.
Here's a very simplified example, for one file.
<property name="lineNumber" value="0" />
<copy file="input.txt" tofile="output.txt" >
<filterchain>
<scriptfilter language="javascript">
project.setProperty( "lineNumber",
parseInt( project.getProperty( "lineNumber" ) ) + 1 );
if ( self.getToken().indexOf("__LINE__") != -1 ) {
lineNumber = project.getProperty( "lineNumber" );
self.setToken( self.getToken( ).replaceAll( "__LINE__", lineNumber ) );
}
</scriptfilter>
</filterchain>
</copy>
问题是:不会扩展到多个文件-lineNumber
不会在文件之间重置为一个.
The problem is: that doesn't extend to multiple files - the lineNumber
doesn't reset to one between files.
您可以使用 filetokenizer
来获取全部信息一次性将文件导入javascript,然后逐行处理该文件.
这是一个非常的点子示例(我知道足够多的javascript都是危险的).我确信这有很多错误(尤其是:它不处理非换行终止的文件;令人震惊的字符串连接).
但是原理是,通过将每个完整文件放入脚本中,您不需要任何信息即可在脚本调用之间持久化.
You might use a filetokenizer
to get the whole file into javascript in one go, then process the file line-by-line.
Here's a very noddy example (I know enough javascript to be dangerous). I'm sure this has lots of faults (not least: it doesn't handle non-newline terminated files; shocking string catenations).
But the principle is that by getting each whole file into the script, you don't need any information to persist between script invocations.
<copy todir="output">
<fileset dir="input"/>
<filterchain>
<tokenfilter>
<filetokenizer/>
<scriptfilter language="javascript"><![CDATA[
// Get the whole input file to one string.
inputContent = self.getToken( );
lineNum = 1;
fileEnd = inputContent.length( );
// Build the new file up line-by-line in this var.
outputContent = "";
lineStart = 0;
lineEnd = inputContent.indexOf( "\n" );
while ( lineEnd < fileEnd ) {
outputContent += inputContent
.substring( lineStart, lineEnd )
.replaceAll( "__LINE__", lineNum ) + "\n";
lineStart = lineEnd + 1;
fc = inputContent.substring( lineStart );
lineEnd = fc.indexOf( "\n" );
if ( lineEnd == -1 )
break;
lineEnd += lineStart;
lineNum++;
}
self.setToken( outputContent );
]]></scriptfilter>
</tokenfilter>
</filterchain>
</copy>
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