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# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Generator that produces an externs file for the Closure Compiler.
Note: This is a work in progress, and generated externs may require tweaking.
See https://developers.google.com/closure/compiler/docs/api-tutorial3#externs
"""
from code import Code
from js_util import JsUtil
from model import *
from schema_util import *
import os
import sys
import re
NOTE = """// NOTE: The format of types has changed. 'FooType' is now
// 'chrome.%s.FooType'.
// Please run the closure compiler before committing changes.
// See https://chromium.googlesource.com/chromium/src/+/master/docs/closure_compilation.md
"""
class JsExternsGenerator(object):
def Generate(self, namespace):
return _Generator(namespace).Generate()
class _Generator(object):
def __init__(self, namespace):
self._namespace = namespace
self._js_util = JsUtil()
def Generate(self):
"""Generates a Code object with the schema for the entire namespace.
"""
c = Code()
(c.Append(self._GetHeader(sys.argv[0], self._namespace.name))
.Append())
self._AppendNamespaceObject(c)
for js_type in self._namespace.types.values():
self._AppendType(c, js_type)
for function in self._namespace.functions.values():
self._AppendFunction(c, function)
for event in self._namespace.events.values():
self._AppendEvent(c, event)
c.TrimTrailingNewlines()
return c
def _GetHeader(self, tool, namespace):
"""Returns the file header text.
"""
return (self._js_util.GetLicense() + '\n' +
self._js_util.GetInfo(tool) + (NOTE % namespace) + '\n' +
('/** @fileoverview Externs generated from namespace: %s */' %
namespace))
def _AppendType(self, c, js_type):
"""Given a Type object, generates the Code for this type's definition.
"""
if js_type.property_type is PropertyType.ENUM:
self._AppendEnumJsDoc(c, js_type)
else:
self._AppendTypeJsDoc(c, js_type)
c.Append()
def _AppendEnumJsDoc(self, c, js_type):
""" Given an Enum Type object, generates the Code for the enum's definition.
"""
(c.Sblock(line='/**', line_prefix=' * ')
.Append('@enum {string}')
.Append(self._js_util.GetSeeLink(self._namespace.name, 'type',
js_type.simple_name))
.Eblock(' */'))
c.Append('chrome.%s.%s = {' % (self._namespace.name, js_type.name))
def get_property_name(e):
# Enum properties are normified to be in ALL_CAPS_STYLE.
# Assume enum '1ring-rulesThemAll'.
# Transform to '1ring-rules_Them_All'.
e = re.sub(r'([a-z])([A-Z])', r'\1_\2', e)
# Transform to '1ring_rules_Them_All'.
e = re.sub(r'\W', '_', e)
# Transform to '_1ring_rules_Them_All'.
e = re.sub(r'^(\d)', r'_\1', e)
# Transform to '_1RING_RULES_THEM_ALL'.
return e.upper()
c.Append('\n'.join(
[" %s: '%s'," % (get_property_name(v.name), v.name)
for v in js_type.enum_values]))
c.Append('};')
def _IsTypeConstructor(self, js_type):
"""Returns true if the given type should be a @constructor. If this returns
false, the type is a typedef.
"""
return any(prop.type_.property_type is PropertyType.FUNCTION
for prop in js_type.properties.values())
def _AppendTypeJsDoc(self, c, js_type):
"""Appends the documentation for a type as a Code.
"""
c.Sblock(line='/**', line_prefix=' * ')
if js_type.description:
for line in js_type.description.splitlines():
c.Append(line)
is_constructor = self._IsTypeConstructor(js_type)
if is_constructor:
c.Comment('@constructor', comment_prefix = ' * ', wrap_indent=4)
else:
self._AppendTypedef(c, js_type.properties)
c.Append(self._js_util.GetSeeLink(self._namespace.name, 'type',
js_type.simple_name))
c.Eblock(' */')
var = 'chrome.%s.%s' % (js_type.namespace.name, js_type.simple_name)
if is_constructor: var += ' = function() {}'
var += ';'
c.Append(var)
def _AppendTypedef(self, c, properties):
"""Given an OrderedDict of properties, Appends code containing a @typedef.
"""
if not properties: return
c.Append('@typedef {')
self._js_util.AppendObjectDefinition(c, self._namespace.name, properties,
new_line=False)
c.Append('}', new_line=False)
def _AppendFunction(self, c, function):
"""Appends the code representing a function, including its documentation.
For example:
/**
* @param {string} title The new title.
*/
chrome.window.setTitle = function(title) {};
"""
self._js_util.AppendFunctionJsDoc(c, self._namespace.name, function)
params = self._GetFunctionParams(function)
c.Append('chrome.%s.%s = function(%s) {};' % (self._namespace.name,
function.name, params))
c.Append()
def _AppendEvent(self, c, event):
"""Appends the code representing an event.
For example:
/** @type {!ChromeEvent} */
chrome.bookmarks.onChildrenReordered;
"""
c.Sblock(line='/**', line_prefix=' * ')
if (event.description):
c.Comment(event.description, comment_prefix='')
c.Append('@type {!ChromeEvent}')
c.Append(self._js_util.GetSeeLink(self._namespace.name, 'event',
event.name))
c.Eblock(' */')
c.Append('chrome.%s.%s;' % (self._namespace.name, event.name))
c.Append()
def _AppendNamespaceObject(self, c):
"""Appends the code creating namespace object.
For example:
/**
* @const
*/
chrome.bookmarks = {};
"""
c.Append("""/**
* @const
*/""")
c.Append('chrome.%s = {};' % self._namespace.name)
c.Append()
def _GetFunctionParams(self, function):
"""Returns the function params string for function.
"""
params = function.params[:]
if function.callback:
params.append(function.callback)
return ', '.join(param.name for param in params)
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