| #!/usr/bin/env python |
| |
| # Copyright (C) 2014 The Android Open Source Project |
| # |
| # 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. |
| |
| """ |
| Enforces common Android public API design patterns. It ignores lint messages from |
| a previous API level, if provided. |
| |
| Usage: apilint.py current.txt |
| Usage: apilint.py current.txt previous.txt |
| """ |
| |
| import re, sys |
| |
| |
| BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8) |
| |
| def format(fg=None, bg=None, bright=False, bold=False, dim=False, reset=False): |
| # manually derived from http://en.wikipedia.org/wiki/ANSI_escape_code#Codes |
| codes = [] |
| if reset: codes.append("0") |
| else: |
| if not fg is None: codes.append("3%d" % (fg)) |
| if not bg is None: |
| if not bright: codes.append("4%d" % (bg)) |
| else: codes.append("10%d" % (bg)) |
| if bold: codes.append("1") |
| elif dim: codes.append("2") |
| else: codes.append("22") |
| return "\033[%sm" % (";".join(codes)) |
| |
| |
| class Field(): |
| def __init__(self, clazz, raw): |
| self.clazz = clazz |
| self.raw = raw.strip(" {;") |
| |
| raw = raw.split() |
| self.split = list(raw) |
| |
| for r in ["field", "volatile", "transient", "public", "protected", "static", "final", "deprecated"]: |
| while r in raw: raw.remove(r) |
| |
| self.typ = raw[0] |
| self.name = raw[1].strip(";") |
| if len(raw) >= 4 and raw[2] == "=": |
| self.value = raw[3].strip(';"') |
| else: |
| self.value = None |
| |
| def __repr__(self): |
| return self.raw |
| |
| |
| class Method(): |
| def __init__(self, clazz, raw): |
| self.clazz = clazz |
| self.raw = raw.strip(" {;") |
| |
| raw = re.split("[\s(),;]+", raw) |
| for r in ["", ";"]: |
| while r in raw: raw.remove(r) |
| self.split = list(raw) |
| |
| for r in ["method", "public", "protected", "static", "final", "deprecated", "abstract"]: |
| while r in raw: raw.remove(r) |
| |
| self.typ = raw[0] |
| self.name = raw[1] |
| self.args = [] |
| for r in raw[2:]: |
| if r == "throws": break |
| self.args.append(r) |
| |
| def __repr__(self): |
| return self.raw |
| |
| |
| class Class(): |
| def __init__(self, pkg, raw): |
| self.pkg = pkg |
| self.raw = raw.strip(" {;") |
| self.ctors = [] |
| self.fields = [] |
| self.methods = [] |
| |
| raw = raw.split() |
| self.split = list(raw) |
| if "class" in raw: |
| self.fullname = raw[raw.index("class")+1] |
| elif "interface" in raw: |
| self.fullname = raw[raw.index("interface")+1] |
| |
| if "." in self.fullname: |
| self.name = self.fullname[self.fullname.rindex(".")+1:] |
| else: |
| self.name = self.fullname |
| |
| def __repr__(self): |
| return self.raw |
| |
| |
| class Package(): |
| def __init__(self, raw): |
| self.raw = raw.strip(" {;") |
| |
| raw = raw.split() |
| self.name = raw[raw.index("package")+1] |
| |
| def __repr__(self): |
| return self.raw |
| |
| |
| def parse_api(fn): |
| api = [] |
| pkg = None |
| clazz = None |
| |
| with open(fn) as f: |
| for raw in f.readlines(): |
| raw = raw.rstrip() |
| |
| if raw.startswith("package"): |
| pkg = Package(raw) |
| elif raw.startswith(" ") and raw.endswith("{"): |
| clazz = Class(pkg, raw) |
| api.append(clazz) |
| elif raw.startswith(" ctor"): |
| clazz.ctors.append(Method(clazz, raw)) |
| elif raw.startswith(" method"): |
| clazz.methods.append(Method(clazz, raw)) |
| elif raw.startswith(" field"): |
| clazz.fields.append(Field(clazz, raw)) |
| |
| return api |
| |
| |
| failures = [] |
| |
| def _fail(clazz, detail, msg): |
| """Records an API failure to be processed later.""" |
| global failures |
| |
| res = msg |
| if detail is not None: |
| res += "\n in " + repr(detail) |
| res += "\n in " + repr(clazz) |
| res += "\n in " + repr(clazz.pkg) |
| failures.append(res) |
| |
| def warn(clazz, detail, msg): |
| _fail(clazz, detail, "%sWarning:%s %s" % (format(fg=YELLOW, bg=BLACK), format(reset=True), msg)) |
| |
| def error(clazz, detail, msg): |
| _fail(clazz, detail, "%sError:%s %s" % (format(fg=RED, bg=BLACK), format(reset=True), msg)) |
| |
| |
| def verify_constants(clazz): |
| """All static final constants must be FOO_NAME style.""" |
| if re.match("R\.[a-z]+", clazz.fullname): return |
| |
| for f in clazz.fields: |
| if "static" in f.split and "final" in f.split: |
| if re.match("[A-Z0-9_]+", f.name) is None: |
| error(clazz, f, "Constant field names should be FOO_NAME") |
| |
| |
| def verify_enums(clazz): |
| """Enums are bad, mmkay?""" |
| if "extends java.lang.Enum" in clazz.raw: |
| error(clazz, None, "Enums are not allowed") |
| |
| |
| def verify_class_names(clazz): |
| """Try catching malformed class names like myMtp or MTPUser.""" |
| if re.search("[A-Z]{2,}", clazz.name) is not None: |
| warn(clazz, None, "Class name style should be Mtp not MTP") |
| if re.match("[^A-Z]", clazz.name): |
| error(clazz, None, "Class must start with uppercase char") |
| |
| |
| def verify_method_names(clazz): |
| """Try catching malformed method names, like Foo() or getMTU().""" |
| if clazz.pkg.name == "android.opengl": return |
| |
| for m in clazz.methods: |
| if re.search("[A-Z]{2,}", m.name) is not None: |
| warn(clazz, m, "Method name style should be getMtu() instead of getMTU()") |
| if re.match("[^a-z]", m.name): |
| error(clazz, None, "Method name must start with lowercase char") |
| |
| |
| def verify_callbacks(clazz): |
| """Verify Callback classes. |
| All callback classes must be abstract. |
| All methods must follow onFoo() naming style.""" |
| |
| if clazz.name.endswith("Callbacks"): |
| error(clazz, None, "Class must be named exactly Callback") |
| if clazz.name.endswith("Observer"): |
| warn(clazz, None, "Class should be named Callback") |
| |
| if clazz.name.endswith("Callback"): |
| if "interface" in clazz.split: |
| error(clazz, None, "Callback must be abstract class") |
| |
| for m in clazz.methods: |
| if not re.match("on[A-Z][a-z]*", m.name): |
| error(clazz, m, "Callback method names must be onFoo style") |
| |
| |
| def verify_listeners(clazz): |
| """Verify Listener classes. |
| All Listener classes must be interface. |
| All methods must follow onFoo() naming style. |
| If only a single method, it must match class name: |
| interface OnFooListener { void onFoo() }""" |
| |
| if clazz.name.endswith("Listener"): |
| if " abstract class " in clazz.raw: |
| error(clazz, None, "Listener should be interface") |
| |
| for m in clazz.methods: |
| if not re.match("on[A-Z][a-z]*", m.name): |
| error(clazz, m, "Listener method names must be onFoo style") |
| |
| if len(clazz.methods) == 1 and clazz.name.startswith("On"): |
| m = clazz.methods[0] |
| if (m.name + "Listener").lower() != clazz.name.lower(): |
| error(clazz, m, "Single method name should match class name") |
| |
| |
| def verify_actions(clazz): |
| """Verify intent actions. |
| All action names must be named ACTION_FOO. |
| All action values must be scoped by package and match name: |
| package android.foo { |
| String ACTION_BAR = "android.foo.action.BAR"; |
| }""" |
| for f in clazz.fields: |
| if f.value is None: continue |
| if f.name.startswith("EXTRA_"): continue |
| |
| if "static" in f.split and "final" in f.split and f.typ == "java.lang.String": |
| if "_ACTION" in f.name or "ACTION_" in f.name or ".action." in f.value.lower(): |
| if not f.name.startswith("ACTION_"): |
| error(clazz, f, "Intent action must be ACTION_FOO") |
| else: |
| if clazz.name == "Intent": |
| prefix = "android.intent.action" |
| elif clazz.name == "Settings": |
| prefix = "android.settings" |
| else: |
| prefix = clazz.pkg.name + ".action" |
| expected = prefix + "." + f.name[7:] |
| if f.value != expected: |
| error(clazz, f, "Inconsistent action value") |
| |
| |
| def verify_extras(clazz): |
| """Verify intent extras. |
| All extra names must be named EXTRA_FOO. |
| All extra values must be scoped by package and match name: |
| package android.foo { |
| String EXTRA_BAR = "android.foo.extra.BAR"; |
| }""" |
| for f in clazz.fields: |
| if f.value is None: continue |
| if f.name.startswith("ACTION_"): continue |
| |
| if "static" in f.split and "final" in f.split and f.typ == "java.lang.String": |
| if "_EXTRA" in f.name or "EXTRA_" in f.name or ".extra" in f.value.lower(): |
| if not f.name.startswith("EXTRA_"): |
| error(clazz, f, "Intent extra must be EXTRA_FOO") |
| else: |
| if clazz.name == "Intent": |
| prefix = "android.intent.extra" |
| else: |
| prefix = clazz.pkg.name + ".extra" |
| expected = prefix + "." + f.name[6:] |
| if f.value != expected: |
| error(clazz, f, "Inconsistent extra value") |
| |
| |
| def verify_equals(clazz): |
| """Verify that equals() and hashCode() must be overridden together.""" |
| methods = [ m.name for m in clazz.methods ] |
| eq = "equals" in methods |
| hc = "hashCode" in methods |
| if eq != hc: |
| error(clazz, None, "Must override both equals and hashCode") |
| |
| |
| def verify_parcelable(clazz): |
| """Verify that Parcelable objects aren't hiding required bits.""" |
| if "implements android.os.Parcelable" in clazz.raw: |
| creator = [ i for i in clazz.fields if i.name == "CREATOR" ] |
| write = [ i for i in clazz.methods if i.name == "writeToParcel" ] |
| describe = [ i for i in clazz.methods if i.name == "describeContents" ] |
| |
| if len(creator) == 0 or len(write) == 0 or len(describe) == 0: |
| error(clazz, None, "Parcelable requires CREATOR, writeToParcel, and describeContents") |
| |
| |
| def verify_protected(clazz): |
| """Verify that no protected methods are allowed.""" |
| for m in clazz.methods: |
| if "protected" in m.split: |
| error(clazz, m, "Protected method") |
| for f in clazz.fields: |
| if "protected" in f.split: |
| error(clazz, f, "Protected field") |
| |
| |
| def verify_fields(clazz): |
| """Verify that all exposed fields are final. |
| Exposed fields must follow myName style. |
| Catch internal mFoo objects being exposed.""" |
| for f in clazz.fields: |
| if not "final" in f.split: |
| error(clazz, f, "Bare fields must be final; consider adding accessors") |
| |
| if not "static" in f.split: |
| if not re.match("[a-z]([a-zA-Z]+)?", f.name): |
| error(clazz, f, "Non-static fields must be myName") |
| |
| if re.match("[m][A-Z]", f.name): |
| error(clazz, f, "Don't expose your internal objects") |
| |
| |
| def verify_register(clazz): |
| """Verify parity of registration methods. |
| Callback objects use register/unregister methods. |
| Listener objects use add/remove methods.""" |
| methods = [ m.name for m in clazz.methods ] |
| for m in clazz.methods: |
| if "Callback" in m.raw: |
| if m.name.startswith("register"): |
| other = "unregister" + m.name[8:] |
| if other not in methods: |
| error(clazz, m, "Missing unregister") |
| if m.name.startswith("unregister"): |
| other = "register" + m.name[10:] |
| if other not in methods: |
| error(clazz, m, "Missing register") |
| |
| if m.name.startswith("add") or m.name.startswith("remove"): |
| error(clazz, m, "Callback should be register/unregister") |
| |
| if "Listener" in m.raw: |
| if m.name.startswith("add"): |
| other = "remove" + m.name[3:] |
| if other not in methods: |
| error(clazz, m, "Missing remove") |
| if m.name.startswith("remove") and not m.name.startswith("removeAll"): |
| other = "add" + m.name[6:] |
| if other not in methods: |
| error(clazz, m, "Missing add") |
| |
| if m.name.startswith("register") or m.name.startswith("unregister"): |
| error(clazz, m, "Listener should be add/remove") |
| |
| |
| def verify_sync(clazz): |
| """Verify synchronized methods aren't exposed.""" |
| for m in clazz.methods: |
| if "synchronized" in m.split: |
| error(clazz, m, "Lock exposed") |
| |
| |
| def verify_intent_builder(clazz): |
| """Verify that Intent builders are createFooIntent() style.""" |
| if clazz.name == "Intent": return |
| |
| for m in clazz.methods: |
| if m.typ == "android.content.Intent": |
| if m.name.startswith("create") and m.name.endswith("Intent"): |
| pass |
| else: |
| warn(clazz, m, "Should be createFooIntent()") |
| |
| |
| def verify_helper_classes(clazz): |
| """Verify that helper classes are named consistently with what they extend.""" |
| if "extends android.app.Service" in clazz.raw: |
| if not clazz.name.endswith("Service"): |
| error(clazz, None, "Inconsistent class name") |
| if "extends android.content.ContentProvider" in clazz.raw: |
| if not clazz.name.endswith("Provider"): |
| error(clazz, None, "Inconsistent class name") |
| if "extends android.content.BroadcastReceiver" in clazz.raw: |
| if not clazz.name.endswith("Receiver"): |
| error(clazz, None, "Inconsistent class name") |
| |
| |
| def verify_builder(clazz): |
| """Verify builder classes. |
| Methods should return the builder to enable chaining.""" |
| if " extends " in clazz.raw: return |
| if not clazz.name.endswith("Builder"): return |
| |
| if clazz.name != "Builder": |
| warn(clazz, None, "Should be standalone Builder class") |
| |
| has_build = False |
| for m in clazz.methods: |
| if m.name == "build": |
| has_build = True |
| continue |
| |
| if m.name.startswith("get"): continue |
| if m.name.startswith("clear"): continue |
| |
| if not m.typ.endswith(clazz.fullname): |
| warn(clazz, m, "Should return the builder") |
| |
| if not has_build: |
| warn(clazz, None, "Missing build() method") |
| |
| |
| def verify_aidl(clazz): |
| """Catch people exposing raw AIDL.""" |
| if "extends android.os.Binder" in clazz.raw or "implements android.os.IInterface" in clazz.raw: |
| error(clazz, None, "Exposing raw AIDL interface") |
| |
| |
| def verify_internal(clazz): |
| """Catch people exposing internal classes.""" |
| if clazz.pkg.name.startswith("com.android"): |
| error(clazz, None, "Exposing internal class") |
| |
| |
| def verify_layering(clazz): |
| """Catch package layering violations. |
| For example, something in android.os depending on android.app.""" |
| ranking = [ |
| ["android.service","android.accessibilityservice","android.inputmethodservice","android.printservice","android.appwidget","android.webkit","android.preference","android.gesture","android.print"], |
| "android.app", |
| "android.widget", |
| "android.view", |
| "android.animation", |
| "android.provider", |
| "android.content", |
| "android.database", |
| "android.graphics", |
| "android.text", |
| "android.os", |
| "android.util" |
| ] |
| |
| def rank(p): |
| for i in range(len(ranking)): |
| if isinstance(ranking[i], list): |
| for j in ranking[i]: |
| if p.startswith(j): return i |
| else: |
| if p.startswith(ranking[i]): return i |
| |
| cr = rank(clazz.pkg.name) |
| if cr is None: return |
| |
| for f in clazz.fields: |
| ir = rank(f.typ) |
| if ir and ir < cr: |
| warn(clazz, f, "Field type violates package layering") |
| |
| for m in clazz.methods: |
| ir = rank(m.typ) |
| if ir and ir < cr: |
| warn(clazz, m, "Method return type violates package layering") |
| for arg in m.args: |
| ir = rank(arg) |
| if ir and ir < cr: |
| warn(clazz, m, "Method argument type violates package layering") |
| |
| |
| def verify_all(api): |
| global failures |
| |
| failures = [] |
| for clazz in api: |
| if clazz.pkg.name.startswith("java"): continue |
| if clazz.pkg.name.startswith("junit"): continue |
| if clazz.pkg.name.startswith("org.apache"): continue |
| if clazz.pkg.name.startswith("org.xml"): continue |
| if clazz.pkg.name.startswith("org.json"): continue |
| if clazz.pkg.name.startswith("org.w3c"): continue |
| |
| verify_constants(clazz) |
| verify_enums(clazz) |
| verify_class_names(clazz) |
| verify_method_names(clazz) |
| verify_callbacks(clazz) |
| verify_listeners(clazz) |
| verify_actions(clazz) |
| verify_extras(clazz) |
| verify_equals(clazz) |
| verify_parcelable(clazz) |
| verify_protected(clazz) |
| verify_fields(clazz) |
| verify_register(clazz) |
| verify_sync(clazz) |
| verify_intent_builder(clazz) |
| verify_helper_classes(clazz) |
| verify_builder(clazz) |
| verify_aidl(clazz) |
| verify_internal(clazz) |
| verify_layering(clazz) |
| |
| return failures |
| |
| |
| cur = parse_api(sys.argv[1]) |
| cur_fail = verify_all(cur) |
| |
| if len(sys.argv) > 2: |
| prev = parse_api(sys.argv[2]) |
| prev_fail = verify_all(prev) |
| |
| # ignore errors from previous API level |
| for p in prev_fail: |
| if p in cur_fail: |
| cur_fail.remove(p) |
| |
| |
| for f in cur_fail: |
| print f |
| print |