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# vi:sts=4:sw=4:et
"""Code for parsing OpenEmbedded license strings"""
import ast
import re
class InvalidLicense(StandardError):
def __init__(self, license):
self.license = license
StandardError.__init__(self)
def __str__(self):
return "invalid license '%s'" % self.license
license_operator = re.compile('([&|() ])')
license_pattern = re.compile('[a-zA-Z0-9.+_\-]+$')
class LicenseVisitor(ast.NodeVisitor):
"""Syntax tree visitor which can accept OpenEmbedded license strings"""
def visit_string(self, licensestr):
new_elements = []
elements = filter(lambda x: x.strip(), license_operator.split(licensestr))
for pos, element in enumerate(elements):
if license_pattern.match(element):
if pos > 0 and license_pattern.match(elements[pos-1]):
new_elements.append('&')
element = '"' + element + '"'
elif not license_operator.match(element):
raise InvalidLicense(element)
new_elements.append(element)
self.visit(ast.parse(' '.join(new_elements)))
class FlattenVisitor(LicenseVisitor):
"""Flatten a license tree (parsed from a string) by selecting one of each
set of OR options, in the way the user specifies"""
def __init__(self, choose_licenses):
self.choose_licenses = choose_licenses
self.licenses = []
LicenseVisitor.__init__(self)
def visit_Str(self, node):
self.licenses.append(node.s)
def visit_BinOp(self, node):
if isinstance(node.op, ast.BitOr):
left = FlattenVisitor(self.choose_licenses)
left.visit(node.left)
right = FlattenVisitor(self.choose_licenses)
right.visit(node.right)
selected = self.choose_licenses(left.licenses, right.licenses)
self.licenses.extend(selected)
else:
self.generic_visit(node)
def flattened_licenses(licensestr, choose_licenses):
"""Given a license string and choose_licenses function, return a flat list of licenses"""
flatten = FlattenVisitor(choose_licenses)
flatten.visit_string(licensestr)
return flatten.licenses
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