diff options
Diffstat (limited to 'meta/lib/oe/license.py')
-rw-r--r-- | meta/lib/oe/license.py | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/meta/lib/oe/license.py b/meta/lib/oe/license.py new file mode 100644 index 0000000000..b230d3ef45 --- /dev/null +++ b/meta/lib/oe/license.py @@ -0,0 +1,32 @@ +# 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))) |