Finish implementing MultiStrOpt

Fixes bug 955308

Previously only multiple string options from the CLI were supported.
This change adds support for config files too and merges the results
from both CLI and config files.

Change-Id: I642408c03ed295fac050105fd4380940e876f228

1 files changed, 126 insertions, 0 deletions

diff --git a/openstack/common/iniparser.py b/openstack/common/iniparser.py
new file mode 100644
index 0000000..53ca023
--- /dev/null
+++ b/openstack/common/iniparser.py
@@ -0,0 +1,126 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2012 OpenStack LLC.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+
+class ParseError(Exception):
+    def __init__(self, message, lineno, line):
+        self.msg = message
+        self.line = line
+        self.lineno = lineno
+
+    def __str__(self):
+        return 'at line %d, %s: %r' % (self.lineno, self.msg, self.line)
+
+
+class BaseParser(object):
+    lineno = 0
+    parse_exc = ParseError
+
+    def _assignment(self, key, value):
+        self.assignment(key, value)
+        return None, []
+
+    def _get_section(self, line):
+        if line[-1] != ']':
+            return self.error_no_section_end_bracket(line)
+        if len(line) <= 2:
+            return self.error_no_section_name(line)
+
+        return line[1:-1]
+
+    def _split_key_value(self, line):
+        colon = line.find(':')
+        equal = line.find('=')
+        if colon < 0 and equal < 0:
+            return self.error_invalid_assignment(line)
+
+        if colon < 0 or (equal >= 0 and equal < colon):
+            key, value = line[:equal], line[equal + 1:]
+        else:
+            key, value = line[:colon], line[colon + 1:]
+
+        return key.strip(), [value.strip()]
+
+    def parse(self, lineiter):
+        key = None
+        value = []
+
+        for line in lineiter:
+            self.lineno += 1
+
+            line = line.rstrip()
+            if not line:
+                # Blank line, ends multi-line values
+                if key:
+                    key, value = self._assignment(key, value)
+                continue
+            elif line[0] in (' ', '\t'):
+                # Continuation of previous assignment
+                if key is None:
+                    self.error_unexpected_continuation(line)
+                else:
+                    value.append(line.lstrip())
+                continue
+
+            if key:
+                # Flush previous assignment, if any
+                key, value = self._assignment(key, value)
+
+            if line[0] == '[':
+                # Section start
+                section = self._get_section(line)
+                if section:
+                    self.new_section(section)
+            elif line[0] in '#;':
+                self.comment(line[1:].lstrip())
+            else:
+                key, value = self._split_key_value(line)
+                if not key:
+                    return self.error_empty_key(line)
+
+        if key:
+            # Flush previous assignment, if any
+            self._assignment(key, value)
+
+    def assignment(self, key, value):
+        """Called when a full assignment is parsed"""
+        raise NotImplementedError()
+
+    def new_section(self, section):
+        """Called when a new section is started"""
+        raise NotImplementedError()
+
+    def comment(self, comment):
+        """Called when a comment is parsed"""
+        pass
+
+    def error_invalid_assignment(self, line):
+        raise self.parse_exc("No ':' or '=' found in assignment",
+                             self.lineno, line)
+
+    def error_empty_key(self, line):
+        raise self.parse_exc('Key cannot be empty', self.lineno, line)
+
+    def error_unexpected_continuation(self, line):
+        raise self.parse_exc('Unexpected continuation line',
+                             self.lineno, line)
+
+    def error_no_section_end_bracket(self, line):
+        raise self.parse_exc('Invalid section (must end with ])',
+                             self.lineno, line)
+
+    def error_no_section_name(self, line):
+        raise self.parse_exc('Empty section name', self.lineno, line)