satisfy pylint

pyproject.toml

@@ -10,7 +10,7 @@ keywords = ['bootconfig', 'xbc', 'configuration']
 dependencies = ['pyparsing']
 requires-python = '>=3.7'
 classifiers = [
-	'Development Status :: 3 - Alpha',
+    'Development Status :: 4 - Beta',
     'Intended Audience :: Developers',
     'License :: OSI Approved :: MIT License',
     'Operating System :: OS Independent',
@@ -43,3 +43,101 @@ addopts = [
     "--import-mode=importlib",
 ]
 pythonpath = 'src'
+
+[tool.pylint.main]
+fail-under = 10
+ignore-patterns = ["^\\.#"]
+jobs = 0
+limit-inference-results = 100
+persistent = true
+py-version = "3.7"
+source-roots = 'src'
+suggestion-mode = true
+
+[tool.pylint.basic]
+argument-naming-style = "snake_case"
+attr-naming-style = "snake_case"
+bad-names = ["foo", "bar", "baz", "toto", "tutu", "tata"]
+class-attribute-naming-style = "any"
+class-const-naming-style = "UPPER_CASE"
+class-naming-style = "PascalCase"
+# XBCParser
+const-naming-style = "PascalCase"
+docstring-min-length = -1
+function-naming-style = "snake_case"
+good-names = ["i", "j", "k", "ex", "Run", "_"]
+inlinevar-naming-style = "any"
+method-naming-style = "snake_case"
+module-naming-style = "snake_case"
+no-docstring-rgx = "^_"
+property-classes = ["abc.abstractproperty"]
+variable-naming-style = "snake_case"
+
+[tool.pylint.classes]
+defining-attr-methods = ["__init__", "__new__", "setUp", "asyncSetUp", "__post_init__"]
+exclude-protected = ["_asdict", "_fields", "_replace", "_source", "_make", "os._exit"]
+valid-classmethod-first-arg = ["cls"]
+valid-metaclass-classmethod-first-arg = ["mcs"]
+
+[tool.pylint.design]
+exclude-too-few-public-methods = 'XBCNode'
+max-args = 5
+max-attributes = 7
+max-bool-expr = 5
+max-branches = 12
+max-locals = 15
+max-parents = 7
+max-public-methods = 20
+max-returns = 6
+max-statements = 50
+min-public-methods = 2
+
+[tool.pylint.exceptions]
+overgeneral-exceptions = ["builtins.BaseException", "builtins.Exception"]
+
+[tool.pylint.format]
+ignore-long-lines = "^\\s*(# )?<?https?://\\S+>?$"
+indent-after-paren = 4
+indent-string = "    "
+max-line-length = 100
+max-module-lines = 1000
+
+[tool.pylint."messages control"]
+confidence = ["HIGH", "CONTROL_FLOW", "INFERENCE", "INFERENCE_FAILURE", "UNDEFINED"]
+disable = ["raw-checker-failed", "bad-inline-option", "locally-disabled", "file-ignored", "suppressed-message", "useless-suppression", "deprecated-pragma", "use-symbolic-message-instead", "use-implicit-booleaness-not-comparison-to-string", "use-implicit-booleaness-not-comparison-to-zero"]
+
+[tool.pylint.miscellaneous]
+notes = ["FIXME", "XXX", "TODO"]
+
+[tool.pylint.refactoring]
+max-nested-blocks = 5
+never-returning-functions = ["sys.exit", "argparse.parse_error"]
+
+[tool.pylint.reports]
+evaluation = "max(0, 0 if fatal else 10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10))"
+score = true
+
+[tool.pylint.similarities]
+ignore-comments = true
+ignore-docstrings = true
+ignore-imports = true
+ignore-signatures = true
+min-similarity-lines = 4
+
+[tool.pylint.typecheck]
+contextmanager-decorators = ["contextlib.contextmanager"]
+ignore-none = true
+ignore-on-opaque-inference = true
+ignored-checks-for-mixins = ["no-member", "not-async-context-manager", "not-context-manager", "attribute-defined-outside-init"]
+ignored-classes = ["optparse.Values", "thread._local", "_thread._local", "argparse.Namespace"]
+missing-member-hint = true
+missing-member-hint-distance = 1
+missing-member-max-choices = 1
+mixin-class-rgx = ".*[Mm]ixin"
+
+[tool.pylint.variables]
+allow-global-unused-variables = true
+callbacks = ["cb_", "_cb"]
+dummy-variables-rgx = "_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_"
+ignored-argument-names = "_.*|^ignored_|^unused_"
+redefining-builtins-modules = ["six.moves", "past.builtins", "future.builtins", "builtins", "io"]

src/xbc/__init__.py

@@ -19,6 +19,17 @@
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+'''
+This module implements support for the eXtra Boot Configuration file
+format specified by the Linux kernel. For more information, please see
+https://docs.kernel.org/admin-guide/bootconfig.html for more
+information.
+
+This is not a strictly-conforming implementation. In particular, this
+module does not adhere to the kernel's 32,767-byte restriction and does
+not enforce the maximum depth of 16 namespaces.
+'''
+
 import re
 
 from collections.abc import Mapping, Sequence
@@ -43,45 +54,67 @@ from pyparsing import (
 from .utils import normalise
 from .version import version as __version__
 
-class Node:
+class XBCNode:
-	def __init__(self, *args, type=None):
+    # pylint: disable=too-few-public-methods
+    'An XBC XBCNode.'
+    def __init__(self, *args, kind=None):
         if isinstance(args[0], str):
             self.args = args[0]
         elif isinstance(args[0][0], str):
             self.args = args[0][0]
         else:
             self.args = args[0][0][0]
-		self.type = type
+        self.type = kind
 
     @property
     def key(self):
+        'The key associated with the node.'
         return self.args[0]
 
-class Key(Node):
+class XBCKey(XBCNode):
+    # pylint: disable=too-few-public-methods
+    'An XBC key.'
     def __init__(self, *args):
+        # pylint: disable=super-init-not-called
         self.args = args[0]
         self.type = 'key'
 
-class KeyValue(Node):
+class XBCKeyValue(XBCNode):
+    'An XBC key/value operation.'
     def __init__(self, *args):
-		super().__init__(args, type='kv')
+        super().__init__(args, kind='kv')
 
     @property
     def op(self):
+        'The operator being performed.'
         return self.args[1]
 
     @property
     def value(self):
+        'The data associated with the operation.'
         return self.args[2]
 
-class Block(Node):
+class XBCBlock(XBCNode):
+    'An XBC block.'
     def __init__(self, *args):
-		super().__init__(args, type='block')
+        super().__init__(args, kind='block')
 
     @property
     def contents(self):
+        'The contents of the block.'
         return self.args[1]
 
+XBCParser = None
+
+class ParseError(Exception):
+    'Exception for parsing errors.'
+
+def lex(data):
+    # pylint: disable=too-many-locals,global-statement,unnecessary-lambda
+    'Run the lexer over the provided data.'
+    global XBCParser
+
+    if XBCParser is None:
         key_fragment = Word(alphas + nums + '_-')
         key = DelimitedList(key_fragment, delim='.', combine=True)
 
@@ -94,51 +127,52 @@ assign = Literal('=')
         update = Literal(':=')
         append = Literal('+=')
         op = assign | update | append
-semi = Literal(';').suppress()
         lbrace = Literal('{').suppress()
         rbrace = Literal('}').suppress()
         terminal = Word(';\n').suppress()
 
-NL = Literal('\n').suppress()
+        NL = Literal('\n').suppress()     # pylint: disable=invalid-name
-WS = Word(' \t').suppress()
+        WS = Word(' \t').suppress()       # pylint: disable=invalid-name
-WS_NL = Word(' \t\n').suppress()
+        WS_NL = Word(' \t\n').suppress()  # pylint: disable=invalid-name
         comment = Literal('#') + restOfLine
 
-values = Group(value + ZeroOrMore(Literal(',').suppress() + Optional(WS_NL) + value), aslist=True)
+        values = Group(
+            value + ZeroOrMore(
+                Literal(',').suppress() +
+                Optional(WS_NL) + value
+            ), aslist=True
+        )
 
         keyvalue = Group(key + Optional(WS) + op + Optional(WS) + values, aslist=True)
-keyvalue.set_parse_action(lambda x: KeyValue(x))
+        keyvalue.set_parse_action(lambda x: XBCKeyValue(x))
 
         key_stmt = key + Optional(WS) + Optional(assign).suppress() + Optional(WS)
-key_stmt.set_parse_action(lambda x: Key(x))
+        key_stmt.set_parse_action(lambda x: XBCKey(x))
 
         block = Forward()
-statement = (keyvalue | key_stmt)
+        statement = keyvalue | key_stmt
         statements = DelimitedList(statement, delim=terminal)
         segment = Group(OneOrMore(block | statements), aslist=True)
 
+        # pylint: disable=expression-not-assigned
         block << Group(key + Optional(WS) + lbrace + segment + rbrace + Optional(NL))
-block.set_parse_action(lambda x: Block(x))
+        block.set_parse_action(lambda x: XBCBlock(x))
 
-data = OneOrMore(segment)
+        XBCParser = OneOrMore(segment)
-
-XBCParser = data
 
         XBCParser.ignore(comment)
 
-class ParseError(Exception):
+    # pylint: disable=too-many-function-args
-	pass
+    return XBCParser.parseString(data).asList()
-
-def lex(data):
-	tree = XBCParser.parseString(data).asList()
-	return tree
 
 def unquote(val):
+    'Remove quotes and trailing whitespace from values.'
     if val[0] in '\'"' and val[0] == val[-1]:
         return val[1:-1]
     return val.strip()
 
 def key_walk(d, key):
+    'Walk the key to guard against post-block key assignments.'
     split = key.split('.')
 
     for i in range(len(split) - 1, 0, -1):
@@ -148,6 +182,8 @@ def key_walk(d, key):
             d[x] = False
 
 def parse_block(key, seq):
+    # pylint: disable=too-many-branches,too-many-statements
+    'Parse the AST in to a real data structure.'
     if isinstance(seq, list) and len(seq) == 1 and isinstance(seq[0], list):
         seq = seq[0]
 
@@ -159,12 +195,13 @@ def parse_block(key, seq):
         else:
             k = item.key
 
-		if isinstance(item, Key):
+        if isinstance(item, XBCKey):
             if k not in ret:
                 ret[k] = True
+                key_walk(ret, k)
             else:
                 raise ParseError(f'key {k} already defined')
-		elif isinstance(item, KeyValue):
+        elif isinstance(item, XBCKeyValue):
             value = item.value
             op = item.op
 
@@ -189,8 +226,8 @@ def parse_block(key, seq):
                     assign = value
 
             if isinstance(assign, list):
-				for i in range(len(assign)):
+                for i, item in enumerate(assign):
-					assign[i] = unquote(assign[i])
+                    assign[i] = unquote(item)
             else:
                 assign = unquote(assign)
 
@@ -201,7 +238,7 @@ def parse_block(key, seq):
 
             if '.' in k:
                 key_walk(ret, k)
-		elif isinstance(item, Block):
+        elif isinstance(item, XBCBlock):
             value = item.contents
 
             if k not in ret:
@@ -220,6 +257,7 @@ def parse_block(key, seq):
     return ret
 
 def parse(data):
+    'Call the lexer and then the parser.'
     tree = lex(data)
 
     d = parse_block(None, tree)
@@ -227,14 +265,17 @@ def parse(data):
     return d
 
 def loads_xbc(data):
+    'Load XBC data provided in a string.'
     return parse(data)
 
 def load_xbc(fp):
-	with open(fp, mode='r') as f:
+    'Open a file and parse its contents.'
+    with open(fp, mode='r', encoding='UTF-8') as f:
         return loads_xbc(f.read())
 
-def longest_key(L):
+def longest_key(seq):
-	lens = [len(x) for x in L]
+    'Find the deepest-nested key in the sequence provided.'
+    lens = [len(x) for x in seq]
     shortest = min(lens)
 
     if shortest < 1:
@@ -245,7 +286,7 @@ def longest_key(L):
     for i in range(shortest):
         count = {}
 
-		for item in L:
+        for item in seq:
             j = item[i]
 
             if j not in count:
@@ -253,40 +294,42 @@ def longest_key(L):
 
             count[j] += 1
         if len(count.keys()) == 1:
-			ret.append(L[0][i])
+            ret.append(seq[0][i])
         else:
             return '.'.join(ret)
     return None
 
 def longest_keys(keys):
+    'Find the longest keys in the sequence provided.'
     keys = [k.split('.') for k in keys]
     ret = set()
 
-	for i in range(len(keys)):
+    for a in keys:
-		for j in range(1, len(keys)):
+        for b in keys[1:]:
-			longest = longest_key([keys[i], keys[j]])
+            longest = longest_key([a, b])
             if longest is not None:
                 ret.add(longest)
     ret.discard('')
     return ret
 
 def make_block(data):
+    # pylint: disable=too-many-locals,too-many-branches
+    'Create XBC blocks.'
     ret = []
 
     leafs = []
     blocks = set()
-	block_keys = []
 
     for key in data.keys():
         if '.' not in key:
             leafs.append(key)
         else:
-			k, rest = key.split('.', maxsplit=1)
+            k, _ = key.split('.', maxsplit=1)
             blocks.add(k)
 
     keys = [k for k in data.keys() if '.' in k]
     temp = longest_keys(keys)
-	if len(temp):
+    if temp:
         mindots = 99
         for i in temp:
             if 0 < i.count('.') < mindots:
@@ -321,11 +364,13 @@ def make_block(data):
     return ret
 
 def saves_xbc(data):
+    'Export the provided dictionary to an XBC-formatted string.'
     ret = make_block(data)
     return '\n'.join(ret)
 
 def save_xbc(data, filename):
-	with open(filename, mode='w') as f:
+    'Export the provided dictionary to an XBC-formatted string and save it.'
+    with open(filename, mode='w', encoding='UTF-8') as f:
         f.write(saves_xbc(data))
 
 __all__ = ['loads_xbc', 'load_xbc', 'saves_xbc', 'save_xbc', 'ParseError']

src/xbc/utils.py

@@ -19,29 +19,37 @@
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+'''
+Utility functions for saving data in XBC format.
+'''
+
 import re
 
 from collections.abc import Sequence, Mapping
 
 KEY_RE   = re.compile(r'^[a-zA-Z0-9_-]+(?:\.(?:[a-zA-Z0-9_-]+))*$')
 NVAL_RE  = re.compile(r'^[^{}=+:;,\n\'"]+$')
-quotes  = '\'"'
+QUOTES   = '\'"'
-other   = {'"': "'", "'": '"'}
+QUOTEMAP = {'"': "'", "'": '"'}
-escapes = {
+ESCAPES  = {
     'backslash': {'"': '\\x22', "'": '\\x27'},
     'html': {'"': '"', "'": '''},
     'url': {'"': '%22', "'": '%27'}
 }
 
 def quote(data, escape='backslash'):
+    'Quote data according to XBC rules.'
+    # don't waste our time if it's a valid bare value.
+    if NVAL_RE.match(data) is not None:
+        return data
     esc = None
 
     # how shall we escape embedded quotes?
     if isinstance(esc, Mapping):
         if '"' in escape and "'" in escape:
             esc = escape
-	elif escape in escapes:
+    else:
-		esc = escapes[escape]
+        esc = ESCAPES.get(escape, None)
 
     if esc is None:
         raise ValueError('unrecognised escape format')
@@ -49,30 +57,30 @@ def quote(data, escape='backslash'):
     f = data[0]
 
     # is this a quoted string?
-	if f in quotes and data[-1] == f:
+    if f in QUOTES and data[-1] == f:
         # return it if we don't need to do anything
         if f not in data[1:-1]:
             return data
-		else:
         # escape embedded quotes
         x = data[1:-1].replace(f, esc[f])
         return f'{f}{x}{f}'
-	else:
+
     # if the other quote isn't used, wrap in it
-		if f in quotes and other[f] not in data[1:]:
+    if f in QUOTES and QUOTEMAP[f] not in data[1:]:
-			q = other[f]
+        q = QUOTEMAP[f]
-			return f'{q}{data}{q}'
     # not a quoted string, but has only one kind of quote
     elif "'" in data and '"' not in data:
-			return f'"{data}"'
+        q = '"'
     elif '"' in data and "'" not in data:
-			return f"'{data}'"
+        q = "'"
-		# not a quoted string and has both types; we escape one
     else:
+        # not a quoted string and has both types; we escape one
         data = data.replace("'", esc["'"])
-			return f"'{data}"
+        q = "'"
+    return f'{q}{data}{q}'
 
 def normalise_string(string):
+    'Normalise values according to XBC rules.'
     if not isinstance(string, str):
         string = str(string)
 
@@ -82,36 +90,41 @@ def normalise_string(string):
     return string
 
 def normalise(data):
+    '''Normalise values according to XBC rules.'''
     if isinstance(data, str) or not isinstance(data, (Sequence, Mapping)):
         return normalise_string(data)
-	elif isinstance(data, Sequence):
+
-		L = []
+    if isinstance(data, Sequence):
+        ret = []
 
         for item in data:
             if isinstance(item, str) or not isinstance(item, (Sequence, Mapping)):
-				L.append(normalise_string(item))
+                ret.append(normalise_string(item))
             # we can unwind nested sequences
             elif isinstance(item, Sequence):
-				L.extend(normalise(item))
+                ret.extend(normalise(item))
             # ...but we can't do that with mappings, the format doesn't
             # support it.
             elif isinstance(item, Mapping):
                 raise ValueError('nested mapping')
             else:
-				raise ValueError(type(value))
+                # this should be impossible to reach, but nothing truly is.
-		L = ', '.join(L)
+                raise ValueError(type(item))
-		return L
+
-	elif isinstance(data, Mapping):
+        ret = ', '.join(ret)
+
+        return ret
+
+    if isinstance(data, Mapping):
         d = {}
         for k, v in data.items():
-			if Key.pattern.match(k) is None:
+            if KEY_RE.match(k) is None:
                 raise KeyError(k)
-			else:
-				k = Key(k)
 
             v = normalise(v)
 
             d[k] = v
+
         return d
 
     return data

src/xbc/version.py

@@ -1 +1,2 @@
+# pylint: disable=missing-module-docstring,invalid-name
 version = '0.1.0'

tests/test_bare.py

@@ -1,49 +1,67 @@
+
+'''
+Tests for base-level keys.
+'''
+
 import pytest
 
 from xbc import loads_xbc, ParseError
 
-
 def test_key():
+    'A key by itself exists.'
     assert loads_xbc('a') == {'a': True}
 
 def test_dot_key():
-	assert loads_xbc('a.a') == {'a.a': True}
+    'A nested key by itself exists.'
+    assert loads_xbc('a.a') == {'a': False, 'a.a': True}
 
 def test_key_eq():
+    'A key with an empty assignment exists.'
     assert loads_xbc('a =') == {'a': True}
 
 def test_keyvalue():
+    'A bare value can be assigned to a key.'
     assert loads_xbc('a = 1') == {'a': '1'}
 
 def test_keyvalue_space():
+    'A bare value can have spaces.'
     assert loads_xbc('a = a b') == {'a': 'a b'}
 
 def test_dot_keyvalue():
+    'A key being assigned to can have dots.'
     assert loads_xbc('a.a = 1') == {'a': False, 'a.a': '1'}
 
 def test_keys():
+    'Statements can be separated by semicolons.'
     assert loads_xbc('a;b') == {'a': True, 'b': True}
 
 def test_dot_keys():
-	assert loads_xbc('a.a;a.b') == {'a.a': True, 'a.b': True}
+    'Keys in compound statements can have dots.'
+    assert loads_xbc('a.a;a.b') == {'a': False, 'a.a': True, 'a.b': True}
 
 def test_quoted():
+    'Values can be quoted with single or double quotes.'
     assert loads_xbc('a = "b"') == {'a': 'b'}
 
 def test_quoted_space():
+    'Quoted values can have trailing whitespace preserved.'
     assert loads_xbc('a = "b "') == {'a': 'b '}
 
 def test_array():
+    'Multiple values can be assigned to a single key.'
     assert loads_xbc('a = 1, 2') == {'a': ['1', '2']}
 
 def test_reassignment():
+    'Keys cannot be reassigned.'
     with pytest.raises(ParseError):
         loads_xbc('a = 1\na = 2')
 
 def test_reassignment_colon():
+    'Keys cannot be reassigned, even in compound statements.'
     with pytest.raises(ParseError):
         loads_xbc('a = 1;a = 2')
 
 def test_ovewrite_nonexistent():
+    'Keys can only be updated if they exist.'
     with pytest.raises(ParseError):
         loads_xbc('a := 1')

tests/test_block.py

@@ -1,24 +1,34 @@
 
+'''
+Test output for XBC blocks.
+'''
+
 import pytest
 
 from xbc import loads_xbc, ParseError
 
 def test_empty():
+    'An empty block should cause the key to exist.'
     assert loads_xbc('a {}') == {'a': True}
 
 def test_keyvalue():
+    'A block should support key/value pairs.'
     assert loads_xbc('a { a = 1 }') == {'a': False, 'a.a': '1'}
 
 def test_nested_block():
+    'A block should support having block members.'
     assert loads_xbc('a { b { c = 1 } }') == {'a.b.c': '1', 'a': False, 'a.b': False}
 
 def test_keyvalue_and_block():
-	assert loads_xbc('a = 1\na { a = 1 }') == {'a': False, 'a': '1', 'a.a': '1'}
+    'A key/value pair can be provided for a block key prior to the block.'
+    assert loads_xbc('a = 1\na { a = 1 }') == {'a': '1', 'a.a': '1'}
 
 def test_reassign_colon():
+    'Attempting to assign to the same key should be an error inside a block too.'
     with pytest.raises(ParseError):
         loads_xbc('a { a = 1; a = 2 }')
 
 def test_assign_after_block():
+    'It is an error to assign to a block key after the block.'
     with pytest.raises(ParseError):
         loads_xbc('a { a = 1 }\na = 1')

tests/test_invalid.py

@@ -1,4 +1,8 @@
 
+'''
+Tests for inputs which are invalid.
+'''
+
 import pytest
 
 from pyparsing.exceptions import ParseException
@@ -7,36 +11,44 @@ from xbc import loads_xbc, ParseError
 # this should fail but does not.
 @pytest.mark.xfail
 def test_whitespace_vc():
+    'Whitespace is prohibited between values and commas.'
     with pytest.raises(ParseError):
         loads_xbc('x = a\n, b')
 
 # this should fail but does not.
 @pytest.mark.xfail
 def test_extra_quote():
+    'Strings cannot contain the quote style that bookends them.'
     with pytest.raises(ParseException):
         loads_xbc("x = '''")
 
 def test_lone_plus():
+    'Bare operators are not permitted.'
     with pytest.raises(ParseException):
         loads_xbc('+')
 
 def test_lone_rbrace():
+    'Braces can only appear as part of a block.'
     with pytest.raises(ParseException):
         loads_xbc('}')
 
 def test_lone_lbrace():
+    'Braces can only appear as part of a block.'
     with pytest.raises(ParseException):
         loads_xbc('{')
 
 def test_lone_braces():
+    'Braces can only appear as part of a block.'
     with pytest.raises(ParseException):
         loads_xbc('{}')
 
 def test_lone_semi():
+    'Semicolons are only permitted as part of a key or key/value statement.'
     with pytest.raises(ParseException):
         loads_xbc(';')
 
 def test_empty():
+    'XBC files cannot be empty.'
     with pytest.raises(ParseException):
         loads_xbc('\n')
     with pytest.raises(ParseException):

tests/test_upstream.py

@@ -1,14 +1,15 @@
 
-import pytest
-
-from xbc import loads_xbc
-
 '''
 The tests in this file are samples drawn from
 https://lwn.net/Articles/806002/.
 '''
 
+import pytest
+
+from xbc import loads_xbc
+
 def test_01():
+    'Key/value example.'
     i = '''feature.option.foo = 1
 feature.option.bar = 2'''
     d = {
@@ -20,6 +21,7 @@ feature.option.bar = 2'''
     assert loads_xbc(i) == d
 
 def test_02():
+    'Block example.'
     i = '''feature.option {
     foo = 1
     bar = 2
@@ -33,6 +35,7 @@ def test_02():
     assert loads_xbc(i) == d
 
 def test_03():
+    'Array example.'
     i = 'feature.options = "foo", "bar"'
     d = {
         'feature': False,
@@ -41,6 +44,7 @@ def test_03():
     assert loads_xbc(i) == d
 
 def test_10():
+    'Compact example.'
     i = 'feature.option{foo=1;bar=2}'
     d = {
         'feature.option': False,
@@ -51,6 +55,7 @@ def test_10():
     assert loads_xbc(i) == d
 
 def test_11():
+    'Example of a possible configuration.'
     i = '''ftrace.event {
     task.task_newtask {
         filter = "pid < 128"
@@ -87,16 +92,21 @@ def test_11():
         'ftrace.event.synthetic': False,
         'ftrace.event.synthetic.initcall_latency': False,
         'ftrace.event.synthetic.initcall_latency.fields': ["unsigned long func", "u64 lat"],
-		'ftrace.event.synthetic.initcall_latency.actions': "hist:keys=func.sym,lat:vals=lat:sort=lat",
+        'ftrace.event.synthetic.initcall_latency.actions':
+        "hist:keys=func.sym,lat:vals=lat:sort=lat",
         'ftrace.event.initcall': False,
         'ftrace.event.initcall.initcall_start': False,
-		'ftrace.event.initcall.initcall_start.actions': "hist:keys=func:ts0=common_timestamp.usecs",
+        'ftrace.event.initcall.initcall_start.actions':
+        "hist:keys=func:ts0=common_timestamp.usecs",
         'ftrace.event.initcall.initcall_finish': False,
-		'ftrace.event.initcall.initcall_finish.actions': "hist:keys=func:lat=common_timestamp.usecs-$ts0:onmatch(initcall.initcall_start).initcall_latency(func,$lat)"
+        'ftrace.event.initcall.initcall_finish.actions':
+        "hist:keys=func:lat=common_timestamp.usecs-$ts0:onmatch(" +
+        "initcall.initcall_start).initcall_latency(func,$lat)"
     }
     assert loads_xbc(i) == d
 
 def test_12():
+    'Another example of a possible configuration.'
     i = '''ftrace.event.synthetic.initcall_latency {
     fields = "unsigned long func", "u64 lat"
     hist {
@@ -130,7 +140,8 @@ def test_12():
         'ftrace.event.synthetic.initcall_latency.hist.to': False,
         'ftrace.event.synthetic.initcall_latency.hist.to.event': 'initcall.initcall_finish',
         'ftrace.event.synthetic.initcall_latency.hist.to.key': 'func',
-		'ftrace.event.synthetic.initcall_latency.hist.to.assigns': "lat=common_timestamp.usecs-$ts0",
+        'ftrace.event.synthetic.initcall_latency.hist.to.assigns':
+        "lat=common_timestamp.usecs-$ts0",
         'ftrace.event.synthetic.initcall_latency.hist.to.onmatch': ['func', '$lat'],
         'ftrace.event.synthetic.initcall_latency.hist.keys': ['func.sym', 'lat'],
         'ftrace.event.synthetic.initcall_latency.hist.vals': 'lat',