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execution_context.rb
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execution_context.rb
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class Puppeteer::ExecutionContext
include Puppeteer::IfPresent
using Puppeteer::DefineAsyncMethod
EVALUATION_SCRIPT_URL = 'pprt://__puppeteer_evaluation_script__'
SOURCE_URL_REGEX = /^[\040\t]*\/\/[@#] sourceURL=\s*(\S*?)\s*$/m
# @param client [Puppeteer::CDPSession]
# @param context_payload [Hash]
# @param world [Puppeteer::DOMWorld?]
def initialize(client, context_payload, world)
@client = client
@world = world
@context_id = context_payload['id']
@context_name = context_payload['name']
end
attr_reader :client, :world
# only used in DOMWorld
private def _context_id
@context_id
end
# only used in DOMWorld::BindingFunction#add_binding_to_context
private def _context_name
@context_name
end
# @return [Puppeteer::Frame]
def frame
if_present(@world) do |world|
world.frame
end
end
# @param page_function [String]
# @return [Object]
def evaluate(page_function, *args)
evaluate_internal(true, page_function, *args)
end
# @param page_function [String]
# @return [Puppeteer::JSHandle]
def evaluate_handle(page_function, *args)
evaluate_internal(false, page_function, *args)
end
class JavaScriptExpression
def initialize(execution_context, expression, return_by_value)
@execution_context = execution_context
@expression = expression
@return_by_value = return_by_value
end
# @param client [Puppeteer::CDPSession]
# @param context_id [String]
# @return [Object|JSHandle]
def evaluate_with(client:, context_id:)
result = client.send_message('Runtime.evaluate',
expression: expression_with_source_url,
contextId: context_id,
returnByValue: @return_by_value,
awaitPromise: true,
userGesture: true,
)
# }).catch(rewriteError);
exception_details = result['exceptionDetails']
if exception_details
raise EvaluationError.new("Evaluation failed: #{exception_details}")
end
remote_object = Puppeteer::RemoteObject.new(result['result'])
if @return_by_value
remote_object.value
else
Puppeteer::JSHandle.create(
context: @execution_context,
remote_object: remote_object,
)
end
end
private def suffix
"//# sourceURL=#{EVALUATION_SCRIPT_URL}"
end
private def expression_with_source_url
if SOURCE_URL_REGEX.match?(@expression)
@expression
else
"#{@expression}\n#{suffix}"
end
end
end
class JavaScriptFunction
include Puppeteer::IfPresent
def initialize(execution_context, expression, args, return_by_value)
@execution_context = execution_context
@expression = expression
@return_by_value = return_by_value
@args = args
end
# @param client [Puppeteer::CDPSession]
# @param context_id [String]
# @return [Object|JSHandle]
def evaluate_with(client:, context_id:)
# `function` can be omitted in JS after ES2015.
# https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Object_initializer
#
# Original puppeteer implementation take it into consideration.
# But we don't support the syntax here.
result = client.send_message('Runtime.callFunctionOn',
functionDeclaration: "#{@expression}\n#{suffix}\n",
executionContextId: context_id,
arguments: converted_args,
returnByValue: @return_by_value,
awaitPromise: true,
userGesture: true,
) # .catch(rewriteError);
exception_details = result['exceptionDetails']
remote_object = Puppeteer::RemoteObject.new(result['result'])
if exception_details
raise EvaluationError.new("Evaluation failed: #{exception_details}")
end
if @return_by_value
remote_object.value
else
Puppeteer::JSHandle.create(
context: @execution_context,
remote_object: remote_object,
)
end
end
private def converted_args
# if (typeof arg === 'bigint') // eslint-disable-line valid-typeof
# return { unserializableValue: `${arg.toString()}n` };
# if (Object.is(arg, -0))
# return { unserializableValue: '-0' };
# if (Object.is(arg, Infinity))
# return { unserializableValue: 'Infinity' };
# if (Object.is(arg, -Infinity))
# return { unserializableValue: '-Infinity' };
# if (Object.is(arg, NaN))
# return { unserializableValue: 'NaN' };
@args.map do |arg|
if arg && arg.is_a?(Puppeteer::JSHandle)
if arg.context != @execution_context
raise EvaluationError.new('JSHandles can be evaluated only in the context they were created!')
elsif arg.disposed?
raise EvaluationError.new('JSHandles is disposed!')
end
arg.remote_object.converted_arg
else
{ value: arg }
end
end
end
# /**
# * @param {!Error} error
# * @return {!Protocol.Runtime.evaluateReturnValue}
# */
# function rewriteError(error) {
# if (error.message.includes('Object reference chain is too long'))
# return {result: {type: 'undefined'}};
# if (error.message.includes('Object couldn\'t be returned by value'))
# return {result: {type: 'undefined'}};
# if (error.message.endsWith('Cannot find context with specified id') || error.message.endsWith('Inspected target navigated or closed'))
# throw new Error('Execution context was destroyed, most likely because of a navigation.');
# throw error;
# }
private def suffix
"//# sourceURL=#{EVALUATION_SCRIPT_URL}"
end
end
class EvaluationError < StandardError; end
# @param return_by_value [Boolean]
# @param page_function [String]
# @return [Object|Puppeteer::JSHandle]
private def evaluate_internal(return_by_value, page_function, *args)
# `function` can be omitted in JS after ES2015.
# https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Object_initializer
# But we don't support the syntax here.
js_object =
if ['=>', 'async', 'function'].any? { |keyword| page_function.include?(keyword) }
JavaScriptFunction.new(self, page_function, args, return_by_value)
else
JavaScriptExpression.new(self, page_function, return_by_value)
end
js_object.evaluate_with(
client: @client,
context_id: @context_id,
)
end
# /**
# * @param {!JSHandle} prototypeHandle
# * @return {!Promise<!JSHandle>}
# */
# async queryObjects(prototypeHandle) {
# assert(!prototypeHandle._disposed, 'Prototype JSHandle is disposed!');
# assert(prototypeHandle._remoteObject.objectId, 'Prototype JSHandle must not be referencing primitive value');
# const response = await this._client.send('Runtime.queryObjects', {
# prototypeObjectId: prototypeHandle._remoteObject.objectId
# });
# return createJSHandle(this, response.objects);
# }
# @param backend_node_id [Integer]
# @return [Puppeteer::ElementHandle]
def adopt_backend_node_id(backend_node_id)
response = @client.send_message('DOM.resolveNode',
backendNodeId: backend_node_id,
executionContextId: @context_id,
)
Puppeteer::JSHandle.create(
context: self,
remote_object: Puppeteer::RemoteObject.new(response["object"]),
)
end
private define_async_method :async_adopt_backend_node_id
# @param element_handle [Puppeteer::ElementHandle]
# @return [Puppeteer::ElementHandle]
def adopt_element_handle(element_handle)
if element_handle.execution_context == self
raise ArgumentError.new('Cannot adopt handle that already belongs to this execution context')
end
unless @world
raise 'Cannot adopt handle without DOMWorld'
end
node_info = element_handle.remote_object.node_info(@client)
response = @client.send_message('DOM.resolveNode',
backendNodeId: node_info["node"]["backendNodeId"],
executionContextId: @context_id,
)
Puppeteer::JSHandle.create(
context: self,
remote_object: Puppeteer::RemoteObject.new(response["object"]),
)
end
end