blocks|key|2735472|text|我必须深入研究源代码才能找到这些问题的答案，所以我希望这能对其他人有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2735473|1.脚本在什么上下文中运行？|offset|length|style|BOLD|2735474|该脚本在groovy.lang.GroovyShell中运行。这个类当前来自Groovy+1.8.5库。以下是代码的摘录：|2735475|//+line+419+-+443+of+the+ExtendedChoiceParamaterDefinition
else+if(!StringUtils.isBlank(groovyScript))+{
++++try+{
++++++++GroovyShell+groovyShell+=+new+GroovyShell();
++++++++setBindings(groovyShell,+bindings);
++++++++Object+groovyValue+=+groovyShell.evaluate(groovyScript);
++++++++String+processedGroovyValue+=+processGroovyValue(isDefault,+groovyValue);
++++++++return+processedGroovyValue;
++++}
++++catch(Exception+e)+{

++++}
}
else+if(!StringUtils.isBlank(groovyScriptFile))+{
++++try+{
++++++++GroovyShell+groovyShell+=+new+GroovyShell();
++++++++setBindings(groovyShell,+bindings);
++++++++groovyScript+=+Util.loadFile(new+File(groovyScriptFile));
++++++++Object+groovyValue+=+groovyShell.evaluate(groovyScript);
++++++++String+processedGroovyValue+=+processGroovyValue(isDefault,+groovyValue);
++++++++return+processedGroovyValue;
++++}
++++catch(Exception+e)+{

++++}
}|code-block|syntax|javascript|2735476|2.我应该从脚本中返回什么？|2735477|如上面的代码所示，脚本应该返回一个字符串，其中包含您在参数或String[]数组中指定的任何分隔符。以下是处理从脚本返回的值的函数的一段代码：|2735478|//+line+450+-+465+of+ExtendedChoiceParameterDefinition
private+String+processGroovyValue(boolean+isDefault,+Object+groovyValue)+{
++++String+value+=+null;
++++if(groovyValue+instanceof+String[])+{
++++++++String[]+groovyValues+=+(String[])groovyValue;
++++++++if(!isDefault)+{
++++++++++++value+=+StringUtils.join((String[])groovyValue,+multiSelectDelimiter);
++++++++}
++++++++else+if(groovyValues.length+>+0)+{
++++++++++++value+=+groovyValues[0];
++++++++}
++++}
++++else+if(groovyValue+instanceof+String)+{
++++++++value+=+(String)groovyValue;
++++}
++++return+value;
}|2735479|3.脚本的cwd目录是什么？是环境变量WORKSPACE吗？|2735480|有关系吗？您可以使用以下命令从脚本中访问环境变量WORKSPACE|2735481|Map<String,+String>+props+=+System.getenv();
def+currentDir+=+props.get('WORKSPACE');|2735482|4.有一个额外的字段叫做变量绑定。它是如何使用的？|2735483|这是一个属性文件格式的key=value文件。然后可以在groovy脚本中解析这些名称。|2735484|++++e.g.
++++key1=foo
++++prop2=bar|2735485|entityMap^0|0|0|E|0|0|0|0|E|0|0|0|0|U|0|0|0|0|P|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@$D|1A|E|1B|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1C|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1D|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|T|5|L|7|1I|8|@]|9|@]|A|$M|N]]|$1|U|3|V|5|6|7|1J|8|@$D|1K|E|1L|F|G]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|L|7|1N|8|@]|9|@]|A|$M|N]]|$1|10|3|11|5|6|7|1O|8|@$D|1P|E|1Q|F|G]]|9|@]|A|$]]|$1|12|3|13|5|6|7|1R|8|@]|9|@]|A|$]]|$1|14|3|15|5|L|7|1S|8|@]|9|@]|A|$M|N]]|$1|16|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|17|$]]

I had to dig into the source code to find the answer to these questions so i hope this helps everyone else.

1. In what context is the script run?

The script is run inside a groovy.lang.GroovyShell. This class is currently from the Groovy 1.8.5 library. here is an excerpt from the code:

<pre><code>// line 419 - 443 of the ExtendedChoiceParamaterDefinition
else if(!StringUtils.isBlank(groovyScript)) {
 try {
 GroovyShell groovyShell = new GroovyShell();
 setBindings(groovyShell, bindings);
 Object groovyValue = groovyShell.evaluate(groovyScript);
 String processedGroovyValue = processGroovyValue(isDefault, groovyValue);
 return processedGroovyValue;
 }
 catch(Exception e) {

 }
}
else if(!StringUtils.isBlank(groovyScriptFile)) {
 try {
 GroovyShell groovyShell = new GroovyShell();
 setBindings(groovyShell, bindings);
 groovyScript = Util.loadFile(new File(groovyScriptFile));
 Object groovyValue = groovyShell.evaluate(groovyScript);
 String processedGroovyValue = processGroovyValue(isDefault, groovyValue);
 return processedGroovyValue;
 }
 catch(Exception e) {

 }
}
</code></pre>

2. What am i supposed to return from the script?

As the above code demonstrates, the script should return a string with whatever delimiter you have specified in the paramater or a String[] array. here is a snippet of the function that processes the value returned from the script:

<pre><code>// line 450 - 465 of ExtendedChoiceParameterDefinition
private String processGroovyValue(boolean isDefault, Object groovyValue) {
 String value = null;
 if(groovyValue instanceof String[]) {
 String[] groovyValues = (String[])groovyValue;
 if(!isDefault) {
 value = StringUtils.join((String[])groovyValue, multiSelectDelimiter);
 }
 else if(groovyValues.length &gt; 0) {
 value = groovyValues[0];
 }
 }
 else if(groovyValue instanceof String) {
 value = (String)groovyValue;
 }
 return value;
}
</code></pre>

3. What directory is the cwd of the script? is it the environment variable WORKSPACE?

Does it matter? You can access the environment variable WORKSPACE from within the script using

<pre><code>Map&lt;String, String&gt; props = System.getenv();
def currentDir = props.get('WORKSPACE');
</code></pre>

4. there is an extra field called variable bindings. How is this used?

This is a property file formatted key=value file. these names are then resolvable in the groovy script.

<pre><code> e.g.
 key1=foo
 prop2=bar
</code></pre>

blocks|key|151546|text|For将json对象(从参数)解析为groovy+object+-+Parsing+and+producing+JSON|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|151547|import+groovy.json.JsonSlurper
def+jsonSlurper+=+new+JsonSlurper()
def+object+=+jsonSlurper.parseText('{+"myList":+[4,+8,+15,+16,+23,+42]+}')
println(object.myList)|code-block|syntax|javascript|151548|entityMap|0|LINK|mutability|MUTABLE|url|http://groovy-lang.org/json.html^0|Y|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

For parse json object (from parametres) to groovy object - <a href="http://groovy-lang.org/json.html" rel="nofollow noreferrer">Parsing and producing JSON</a>

<pre><code>import groovy.json.JsonSlurper
def jsonSlurper = new JsonSlurper()
def object = jsonSlurper.parseText('{ "myList": [4, 8, 15, 16, 23, 42] }')
println(object.myList)
</code></pre>

The <a href="https://wiki.jenkins-ci.org/display/JENKINS/Extended+Choice+Parameter+plugin">website for the plugin</a> says that you can create a groovy script to run to determine the parameter list.

how is this resolved though? The instructions don't say anything. 

<ol>
<li>In what context is the script run?</li>
<li>What am i supposed to return from the script?</li>
<li>What directory is the cwd of the script? is it the environment variable WORKSPACE?</li>
<li>there is an extra field called <code>variable bindings</code>. How is this used?</li>
</ol>

jenkins extended parameter plugin groovy script

说您可以创建一个groovy脚本来运行以确定参数列表。那么这个问题是如何解决的呢？说明书上什么也没说。脚本在什么上下文中运行？脚本应该返回什么？脚本的cwd目录是什么？是不是环境变量WORKSPACE?there是一个叫做variable bindings的额外字段。如何使用？

问jenkins扩展参数插件groovy脚本
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