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PhutilArgumentWorkflow.php
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Sat, Nov 23, 23:29

PhutilArgumentWorkflow.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* 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.
*/
/**
* Used with @{class:PhutilArgumentParser} to build command line tools which
* operate in several modes, called "workflows", like `git`, `svn`, `arc`,
* `apt-get`. For example, you might build a simple calculator like this:
*
* name=scripts/example/calculator.php
* $args = new PhutilArgumentParser($argv);
* $args->setTagline('simple calculator example');
* $args->setSynopsis(<<<EOHELP
* **calculator.php** __op__ __n__ ...
* Perform a calculation.
* EOHELP
* );
*
* $add_workflow = id(new PhutilArgumentWorkflow())
* ->setName('add')
* ->setExamples('**add** __n__ ...')
* ->setSynopsis('Compute the sum of a list of numbers.')
* ->setArguments(
* array(
* array(
* 'name' => 'numbers',
* 'wildcard' => true,
* ),
* ));
*
* $mul_workflow = id(new PhutilArgumentWorkflow())
* ->setName('mul')
* ->setExamples('**mul** __n__ ...')
* ->setSynopsis('Compute the product of a list of numbers.')
* ->setArguments(
* array(
* array(
* 'name' => 'numbers',
* 'wildcard' => true,
* ),
* ));
*
* $flow = $args->parseWorkflows(
* array(
* $add_workflow,
* $mul_workflow,
* new PhutilHelpArgumentWorkflow(),
* ));
*
* $nums = $args->getArg('numbers');
* if (empty($nums)) {
* echo "You must provide one or more numbers!\n";
* exit(1);
* }
*
* foreach ($nums as $num) {
* if (!is_numeric($num)) {
* echo "Number '{$num}' is not numeric!\n";
* exit(1);
* }
* }
*
* switch ($flow->getName()) {
* case 'add':
* echo array_sum($nums)."\n";
* break;
* case 'mul':
* echo array_product($nums)."\n";
* break;
* }
*
* You can also subclass this class and return `true` from
* @{method:isExecutable}. In this case, the parser will automatically select
* your workflow when the user invokes it.
*
* @stable
* @concrete-extensible
*/
class PhutilArgumentWorkflow {
private $name;
private $synopsis;
private $specs = array();
private $examples;
final public function __construct() {
$this->didConstruct();
}
public function setName($name) {
$this->name = $name;
return $this;
}
public function getName() {
return $this->name;
}
final public function setExamples($examples) {
$this->examples = $examples;
return $this;
}
final public function getExamples() {
if (!$this->examples) {
return "**".$this->name."**";
}
return $this->examples;
}
final public function setSynopsis($synopsis) {
$this->synopsis = $synopsis;
return $this;
}
final public function getSynopsis() {
return $this->synopsis;
}
final public function setArguments(array $specs) {
$specs = PhutilArgumentSpecification::newSpecsFromList($specs);
$this->specs = $specs;
return $this;
}
final public function getArguments() {
return $this->specs;
}
protected function didConstruct() {
return null;
}
public function isExecutable() {
return false;
}
public function execute(PhutilArgumentParser $args) {
throw new Exception("This workflow isn't executable!");
}
}

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