add JTE to ModelParser

pipeline-model-definition/src/main/groovy/org/jenkinsci/plugins/pipeline/modeldefinition/parser/ModelParser.groovy

@@ -37,6 +37,7 @@ import org.codehaus.groovy.ast.expr.*
 import org.codehaus.groovy.ast.stmt.BlockStatement
 import org.codehaus.groovy.ast.stmt.ExpressionStatement
 import org.codehaus.groovy.ast.stmt.Statement
+import org.codehaus.groovy.ast.stmt.TryCatchStatement
 import org.codehaus.groovy.classgen.VariableScopeVisitor
 import org.codehaus.groovy.control.SourceUnit
 import org.codehaus.groovy.syntax.Types
@@ -174,6 +175,28 @@ class ModelParser implements Parser {
                     return pipelineDefs.get(0)
                 }
             }
+
+            /*
+             * If this is the Jenkins Templating Engine, the structure will be:
+             *   try{
+             *     ..
+             *     <user defined template> <-- might be pipeline block
+             *   } catch {
+             *     ..
+             *   }
+             */
+            def firstStatement = src.statementBlock.statements.get(0)
+            if (firstStatement instanceof BlockStatement) {
+                def maybeTry = firstStatement.getStatements().last()
+                if (maybeTry instanceof TryCatchStatement){
+                    def pipelineStatement = maybeTry.getTryStatement().statements.find{ stmt ->
+                        return isDeclarativePipelineStep(stmt)
+                    }
+                    if (pipelineStatement != null){
+                        return parsePipelineStep(src, pipelineStatement, secondaryRun)
+                    }
+                }
+            }
         }
 
         // Check if there's a 'pipeline' step somewhere nested within the other statements and error out if that's the case.