Ladder API examples

ldr_ex1.py

from oii.ldr import Resolver

RESOLVER="""
<rule name="main">
  <path var="conf_file" match="/etc/*/*.conf"/>
</rule>
"""

# load the resolver from the text block.
# you can also pass a filename to Resolver
R = Resolver(RESOLVER)

# this is how to invoke the rule "main"
for solution in R.main():
    print solution

ldr_ex2.py

from oii.ldr import Resolver

RESOLVER="""
<namespace name="myrules">
  <rule name="people">
    <var name="person">
      <val>Hansel</val>
      <val>Gretel</val>
      <val>Ted</val>
      <val>Alice</val>
    </var>
  </rule>
  <rule name="greetpeople">
    <invoke rule="myrules.people"/>
    <var name="greeting">Hello, ${person}.</var>
  </rule>
</namespace>
"""

R = Resolver(RESOLVER)

# invoke "myrules.greetpeople"
for solution in R.myrules.greetpeople():
    print solution

ldr_ex3.py

from oii.ldr import Resolver

RESOLVER="""
<rule name="both">
  <any>
    <match var="number" pattern="\(?(\d{3})\)? *-? *(\d{3}) *-? *(\d{4})" groups="areaCode prefix lineNumber">
      <test var="areaCode" ne="900"/>
    </match>
    <match var="number" pattern="(\d{3}) *-? *(\d{4})" groups="prefix lineNumber">
      <test var="prefix" ne="555"/>
    </match>
  </any>
</rule>
"""

R = Resolver(RESOLVER)

# to bind variables when invoking a rule, pass the bindings
# as keyword arguments
for solution in R.both(number="(508) 274-9999"):
    print solution

ldr_ex4.py

from oii.ldr import Resolver

R = Resolver('ldr_ex4.xml')

for solution in R.dir_filter(dir='/etc',extension='conf'):
    print solution.get('file')

ldr_ex4.xml

<rule name="dir_filter">
  <path var="file" match="${dir}/*.${extension}"/>
</rule>