parameter.py

from __future__ import absolute_import, print_function, unicode_literals

from xml.dom.minidom import parseString

from jinja2 import Template

from .interface import Action

_PARAMETER_TEMPLATE = Template("""        <hudson.model.StringParameterDefinition>
          <name>{{ name | escape }}</name>
          <description>{{ description | escape }}</description>
          <defaultValue>{{ default_value | escape }}</defaultValue>
        </hudson.model.StringParameterDefinition>""")

class ParameterAction(Action):
    """
    A ParameterAction adds a parameter to the job.
    """
    def __init__(self, name, description, default_value=''):
        self.name = name
        self.description = description
        self.default_value = default_value

    def generate_parameters(self):
        return [_PARAMETER_TEMPLATE.render(name=self.name, description=self.description, default_value=self.default_value)]

def reduce_parameters(parameters):
    """
    Filters the provided list of parameter XML snippets, returning only the
    last parameter defined with a given name
    """
    existing = []
    filtered = []
    for parameter in reversed(parameters):
        name = (
            parseString(parameter).
            getElementsByTagName("hudson.model.StringParameterDefinition")[0].
            getElementsByTagName("name")[0].
            childNodes[0].nodeValue
        )
        if name in existing:
            continue
        existing.append(name)
        filtered.insert(0, parameter)
    return filtered