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PhutilArgumentParser.php
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Fri, Nov 29, 10:21

PhutilArgumentParser.php
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<?php
/**
* Parser for command-line arguments for scripts. Like similar parsers, this
* class allows you to specify, validate, and render help for command-line
* arguments. For example:
*
* name=create_dog.php
* $args = new PhutilArgumentParser($argv);
* $args->setTagline('make an new dog')
* $args->setSynopsis(<<<EOHELP
* **dog** [--big] [--name __name__]
* Create a new dog. How does it work? Who knows.
* EOHELP
* );
* $args->parse(
* array(
* array(
* 'name' => 'name',
* 'param' => 'dogname',
* 'default' => 'Rover',
* 'help' => 'Set the dog\'s name. By default, the dog will be '.
* 'named "Rover".',
* ),
* array(
* 'name' => 'big',
* 'short' => 'b',
* 'help' => 'If set, create a large dog.',
* ),
* ));
*
* $dog_name = $args->getArg('name');
* $dog_size = $args->getArg('big') ? 'big' : 'small';
*
* // ... etc ...
*
* (For detailed documentation on supported keys in argument specifications,
* see @{class:PhutilArgumentSpecification}.)
*
* This will handle argument parsing, and generate appropriate usage help if
* the user provides an unsupported flag. @{class:PhutilArgumentParser} also
* supports some builtin "standard" arguments:
*
* $args->parseStandardArguments();
*
* See @{method:parseStandardArguments} for details. Notably, this includes
* a "--help" flag, and an "--xprofile" flag for profiling command-line scripts.
*
* Normally, when the parser encounters an unknown flag, it will exit with
* an error. However, you can use @{method:parsePartial} to consume only a
* set of flags:
*
* $args->parsePartial($spec_list);
*
* This allows you to parse some flags before making decisions about other
* parsing, or share some flags across scripts. The builtin standard arguments
* are implemented in this way.
*
* There is also builtin support for "workflows", which allow you to build a
* script that operates in several modes (e.g., by accepting commands like
* `install`, `upgrade`, etc), like `arc` does. For detailed documentation on
* workflows, see @{class:PhutilArgumentWorkflow}.
*
* @task parse Parsing Arguments
* @task read Reading Arguments
* @task help Command Help
* @task internal Internals
*
* @group console
*/
final class PhutilArgumentParser {
private $bin;
private $argv;
private $specs = array();
private $results = array();
private $parsed;
private $tagline;
private $synopsis;
private $workflows;
private $showHelp;
const PARSE_ERROR_CODE = 77;
/* -( Parsing Arguments )-------------------------------------------------- */
/**
* Build a new parser. Generally, you start a script with:
*
* $args = new PhutilArgumentParser($argv);
*
* @param list Argument vector to parse, generally the $argv global.
* @task parse
*/
public function __construct(array $argv) {
$this->bin = $argv[0];
$this->argv = array_slice($argv, 1);
}
/**
* Parse and consume a list of arguments, removing them from the argument
* vector but leaving unparsed arguments for later consumption. You can
* retreive unconsumed arguments directly with
* @{method:getUnconsumedArgumentVector}. Doing a partial parse can make it
* easier to share common flags across scripts or workflows.
*
* @param list List of argument specs, see
* @{class:PhutilArgumentSpecification}.
* @return this
* @task parse
*/
public function parsePartial(array $specs) {
$specs = PhutilArgumentSpecification::newSpecsFromList($specs);
$this->mergeSpecs($specs);
$specs_by_name = mpull($specs, null, 'getName');
$specs_by_short = mpull($specs, null, 'getShortAlias');
unset($specs_by_short[null]);
$argv = $this->argv;
$len = count($argv);
for ($ii = 0; $ii < $len; $ii++) {
$arg = $argv[$ii];
$map = null;
if ($arg == '--') {
// This indicates "end of flags".
break;
} else if ($arg == '-') {
// This is a normal argument (e.g., stdin).
continue;
} else if (!strncmp('--', $arg, 2)) {
$pre = '--';
$arg = substr($arg, 2);
$map = $specs_by_name;
} else if (!strncmp('-', $arg, 1) && strlen($arg) > 1) {
$pre = '-';
$arg = substr($arg, 1);
$map = $specs_by_short;
}
if ($map) {
$val = null;
$parts = explode('=', $arg, 2);
if (count($parts) == 2) {
list($arg, $val) = $parts;
}
if (isset($map[$arg])) {
$spec = $map[$arg];
unset($argv[$ii]);
$param_name = $spec->getParamName();
if ($val !== null) {
if ($param_name === null) {
throw new PhutilArgumentUsageException(
"Argument '{$pre}{$arg}' does not take a parameter.");
}
} else {
if ($param_name !== null) {
if ($ii + 1 < $len) {
$val = $argv[$ii + 1];
unset($argv[$ii + 1]);
$ii++;
} else {
throw new PhutilArgumentUsageException(
"Argument '{$pre}{$arg}' requires a parameter.");
}
} else {
$val = true;
}
}
if (!$spec->getRepeatable()) {
if (array_key_exists($spec->getName(), $this->results)) {
throw new PhutilArgumentUsageException(
"Argument '{$pre}{$arg}' was provided twice.");
}
}
$conflicts = $spec->getConflicts();
foreach ($conflicts as $conflict => $reason) {
if (array_key_exists($conflict, $this->results)) {
if (!is_string($reason) || !strlen($reason)) {
$reason = '.';
} else {
$reason = ': '.$reason.'.';
}
throw new PhutilArgumentUsageException(
"Argument '{$pre}{$arg}' conflicts with argument ".
"'--{$conflict}'{$reason}");
}
}
if ($spec->getRepeatable()) {
if ($spec->getParamName() === null) {
if (empty($this->results[$spec->getName()])) {
$this->results[$spec->getName()] = 0;
}
$this->results[$spec->getName()]++;
} else {
$this->results[$spec->getName()][] = $val;
}
} else {
$this->results[$spec->getName()] = $val;
}
}
}
}
foreach ($specs as $spec) {
if ($spec->getWildcard()) {
$this->results[$spec->getName()] = $this->filterWildcardArgv($argv);
$argv = array();
break;
}
}
$this->argv = array_values($argv);
return $this;
}
/**
* Parse and consume a list of arguments, throwing an exception if there is
* anything left unconsumed. This is like @{method:parsePartial}, but raises
* a {class:PhutilArgumentUsageException} if there are leftovers.
*
* Normally, you would call @{method:parse} instead, which emits a
* user-friendly error. You can also use @{method:printUsageException} to
* render the exception in a user-friendly way.
*
* @param list List of argument specs, see
* @{class:PhutilArgumentSpecification}.
* @return this
* @task parse
*/
public function parseFull(array $specs) {
$this->parsePartial($specs);
if (count($this->argv)) {
$arg = head($this->argv);
throw new PhutilArgumentUsageException(
"Unrecognized argument '{$arg}'.");
}
if ($this->showHelp) {
$this->printHelpAndExit();
}
return $this;
}
/**
* Parse and consume a list of arguments, raising a user-friendly error if
* anything remains. See also @{method:parseFull} and @{method:parsePartial}.
*
* @param list List of argument specs, see
* @{class:PhutilArgumentSpecification}.
* @return this
* @task parse
*/
public function parse(array $specs) {
try {
return $this->parseFull($specs);
} catch (PhutilArgumentUsageException $ex) {
$this->printUsageException($ex);
exit(self::PARSE_ERROR_CODE);
}
}
/**
* Parse and execute workflows, raising a user-friendly error if anything
* remains. See also @{method:parseWorkflowsFull}.
*
* See @{class:PhutilArgumentWorkflow} for details on using workflows.
*
* @param list List of argument specs, see
* @{class:PhutilArgumentSpecification}.
* @return this
* @task parse
*/
public function parseWorkflows(array $workflows) {
try {
return $this->parseWorkflowsFull($workflows);
} catch (PhutilArgumentUsageException $ex) {
$this->printUsageException($ex);
exit(self::PARSE_ERROR_CODE);
}
}
/**
* Select a workflow. For commands that may operate in several modes, like
* `arc`, the modes can be split into "workflows". Each workflow specifies
* the arguments it accepts. This method takes a list of workflows, selects
* the chosen workflow, parses its arguments, and either executes it (if it
* is executable) or returns it for handling.
*
* See @{class:PhutilArgumentWorkflow} for details on using workflows.
*
* @param list List of @{class:PhutilArgumentWorkflow}s.
* @return PhutilArgumentWorkflow|no Returns the chosen workflow if it is
* not executable, or executes it and
* exits with a return code if it is.
* @task parse
*/
public function parseWorkflowsFull(array $workflows) {
assert_instances_of($workflows, 'PhutilArgumentWorkflow');
// Clear out existing workflows. We need to do this to permit the
// construction of sub-workflows.
$this->workflows = array();
foreach ($workflows as $workflow) {
$name = $workflow->getName();
if ($name === null) {
throw new PhutilArgumentSpecificationException(
"Workflow has no name!");
}
if (isset($this->workflows[$name])) {
throw new PhutilArgumentSpecificationException(
"Two workflows with name '{$name}!");
}
$this->workflows[$name] = $workflow;
}
$argv = $this->argv;
if (empty($argv)) {
// TODO: this is kind of hacky / magical.
if (isset($this->workflows['help'])) {
$argv = array('help');
} else {
throw new PhutilArgumentUsageException(
"No workflow selected.");
}
}
$flow = array_shift($argv);
$flow = strtolower($flow);
if (empty($this->workflows[$flow])) {
throw new PhutilArgumentUsageException(
"Invalid workflow '{$flow}'.");
}
$workflow = $this->workflows[$flow];
if ($this->showHelp) {
$this->printHelpAndExit();
}
$this->argv = array_values($argv);
if ($workflow->shouldParsePartial()) {
$this->parsePartial($workflow->getArguments());
} else {
$this->parse($workflow->getArguments());
}
if ($workflow->isExecutable()) {
$err = $workflow->execute($this);
exit($err);
} else {
return $workflow;
}
}
/**
* Parse "standard" arguments and apply their effects:
*
* --trace Enable service call tracing.
* --no-ansi Disable ANSI color/style sequences.
* --xprofile <file> Write out an XHProf profile.
* --help Show help.
*
* @return this
*
* @phutil-external-symbol function xhprof_enable
*/
public function parseStandardArguments() {
try {
$this->parsePartial(
array(
array(
'name' => 'trace',
'help' => 'Trace command execution and show service calls.',
'standard' => true,
),
array(
'name' => 'no-ansi',
'help' => 'Disable ANSI terminal codes, printing plain text with '.
'no color or style.',
'conflicts' => array(
'ansi' => null,
),
'standard' => true,
),
array(
'name' => 'ansi',
'help' => "Use formatting even in environments which probably ".
"don't support it.",
'standard' => true,
),
array(
'name' => 'xprofile',
'param' => 'profile',
'help' => 'Profile script execution and write results to a file.',
'standard' => true,
),
array(
'name' => 'help',
'short' => 'h',
'help' => 'Show this help.',
'standard' => true,
),
array(
'name' => 'show-standard-options',
'help' => 'Show every option, including standard options '.
'like this one.',
'standard' => true,
),
array(
'name' => 'recon',
'help' => 'Start in remote console mode.',
'standard' => true,
),
));
} catch (PhutilArgumentUsageException $ex) {
$this->printUsageException($ex);
exit(self::PARSE_ERROR_CODE);
}
if ($this->getArg('trace')) {
PhutilServiceProfiler::installEchoListener();
}
if ($this->getArg('no-ansi')) {
PhutilConsoleFormatter::disableANSI(true);
}
if ($this->getArg('ansi')) {
PhutilConsoleFormatter::disableANSI(false);
}
if ($this->getArg('help')) {
$this->showHelp = true;
}
$xprofile = $this->getArg('xprofile');
if ($xprofile) {
if (!function_exists('xhprof_enable')) {
throw new Exception("To use '--xprofile', you must install XHProf.");
}
xhprof_enable(0);
register_shutdown_function(array($this, 'shutdownProfiler'));
}
$recon = $this->getArg('recon');
if ($recon) {
$remote_console = PhutilConsole::newRemoteConsole();
$remote_console->beginRedirectOut();
PhutilConsole::setConsole($remote_console);
} else if ($this->getArg('trace')) {
$server = new PhutilConsoleServer();
$server->setEnableLog(true);
$console = PhutilConsole::newConsoleForServer($server);
PhutilConsole::setConsole($console);
}
return $this;
}
/* -( Reading Arguments )-------------------------------------------------- */
public function getArg($name) {
if (empty($this->specs[$name])) {
throw new PhutilArgumentSpecificationException(
"No specification exists for argument '{$name}'!");
}
if (idx($this->results, $name) !== null) {
return $this->results[$name];
}
return $this->specs[$name]->getDefault();
}
public function getUnconsumedArgumentVector() {
return $this->argv;
}
/* -( Command Help )------------------------------------------------------- */
public function setSynopsis($synopsis) {
$this->synopsis = $synopsis;
return $this;
}
public function setTagline($tagline) {
$this->tagline = $tagline;
return $this;
}
public function printHelpAndExit() {
echo $this->renderHelp();
exit(self::PARSE_ERROR_CODE);
}
public function renderHelp() {
$out = array();
$more = array();
if ($this->bin) {
$out[] = $this->format('**NAME**');
$name = $this->indent(6, '**%s**', basename($this->bin));
if ($this->tagline) {
$name .= $this->format(' - '.$this->tagline);
}
$out[] = $name;
$out[] = null;
}
if ($this->synopsis) {
$out[] = $this->format('**SYNOPSIS**');
$out[] = $this->indent(6, $this->synopsis);
$out[] = null;
}
if ($this->workflows) {
$has_help = false;
$out[] = $this->format('**WORKFLOWS**');
$out[] = null;
$flows = $this->workflows;
ksort($flows);
foreach ($flows as $workflow) {
if ($workflow->getName() == 'help') {
$has_help = true;
}
$out[] = $this->renderWorkflowHelp(
$workflow->getName(),
$show_flags = false);
}
if ($has_help) {
$more[] = "Use **help** __command__ for a detailed command reference.";
}
}
$specs = $this->renderArgumentSpecs($this->specs);
if ($specs) {
$out[] = $this->format('**OPTION REFERENCE**');
$out[] = null;
$out[] = $specs;
}
// If we have standard options but no --show-standard-options, print out
// a quick hint about it.
if (!empty($this->specs['show-standard-options']) &&
!$this->getArg('show-standard-options')) {
$more[] = "Use __--show-standard-options__ to show additional options.";
}
$out[] = null;
if ($more) {
foreach ($more as $hint) {
$out[] = $this->indent(0, $hint);
}
$out[] = null;
}
return implode("\n", $out);
}
public function renderWorkflowHelp(
$workflow_name,
$show_flags = false) {
$out = array();
$workflow = idx($this->workflows, strtolower($workflow_name));
if (!$workflow) {
$out[] = $this->indent(
6,
"There is no **{$workflow_name}** workflow.");
} else {
$out[] = $this->indent(6, $workflow->getExamples());
$out[] = $this->indent(6, $workflow->getSynopsis());
if ($show_flags) {
$specs = $this->renderArgumentSpecs($workflow->getArguments());
if ($specs) {
$out[] = null;
$out[] = $specs;
}
}
}
$out[] = null;
return implode("\n", $out);
}
public function printUsageException(PhutilArgumentUsageException $ex) {
fwrite(
STDERR,
$this->format("**Usage Exception:** %s\n", $ex->getMessage()));
}
/* -( Internals )---------------------------------------------------------- */
private function filterWildcardArgv(array $argv) {
foreach ($argv as $key => $value) {
if ($value == '--') {
unset($argv[$key]);
break;
} else if (!strncmp($value, '-', 1) && strlen($value) > 1) {
throw new PhutilArgumentUsageException(
"Argument '{$value}' is unrecognized. Use '--' to indicate the ".
"end of flags.");
}
}
return array_values($argv);
}
private function mergeSpecs(array $specs) {
$short_map = mpull($this->specs, null, 'getShortAlias');
unset($short_map[null]);
$wildcard = null;
foreach ($this->specs as $spec) {
if ($spec->getWildcard()) {
$wildcard = $spec;
break;
}
}
foreach ($specs as $spec) {
$spec->validate();
$name = $spec->getName();
if (isset($this->specs[$name])) {
throw new PhutilArgumentSpecificationException(
"Two argument specifications have the same name ('{$name}').");
}
$short = $spec->getShortAlias();
if ($short) {
if (isset($short_map[$short])) {
throw new PhutilArgumentSpecificationException(
"Two argument specifications have the same short alias ".
"('{$short}').");
}
$short_map[$short] = $spec;
}
if ($spec->getWildcard()) {
if ($wildcard) {
throw new PhutilArgumentSpecificationException(
"Two argument specifications are marked as wildcard arguments. ".
"You can have a maximum of one wildcard argument.");
} else {
$wildcard = $spec;
}
}
$this->specs[$name] = $spec;
}
foreach ($this->specs as $name => $spec) {
foreach ($spec->getConflicts() as $conflict => $reason) {
if (empty($this->specs[$conflict])) {
throw new PhutilArgumentSpecificationException(
"Argument '{$name}' conflicts with unspecified argument ".
"'{$conflict}'.");
}
if ($conflict == $name) {
throw new PhutilArgumentSpecificationException(
"Argument '{$name}' conflicts with itself!");
}
}
}
}
private function renderArgumentSpecs(array $specs) {
foreach ($specs as $key => $spec) {
if ($spec->getWildcard()) {
unset($specs[$key]);
}
}
$out = array();
$specs = msort($specs, 'getName');
foreach ($specs as $spec) {
if ($spec->getStandard() && !$this->getArg('show-standard-options')) {
// If this is a standard argument and the user didn't pass
// --show-standard-options, skip it.
continue;
}
$name = $this->indent(6, '__--%s__', $spec->getName());
$short = null;
if ($spec->getShortAlias()) {
$short = $this->format(', __-%s__', $spec->getShortAlias());
}
if ($spec->getParamName()) {
$param = $this->format(' __%s__', $spec->getParamName());
$name .= $param;
if ($short) {
$short .= $param;
}
}
$out[] = $name.$short;
$out[] = $this->indent(10, $spec->getHelp());
$out[] = null;
}
return implode("\n", $out);
}
private function format($str /* , ... */) {
$args = func_get_args();
return call_user_func_array(
'phutil_console_format',
$args);
}
private function indent($level, $str /* , ... */) {
$args = func_get_args();
$args = array_slice($args, 1);
$text = call_user_func_array(array($this, 'format'), $args);
return phutil_console_wrap($text, $level);
}
/**
* @phutil-external-symbol function xhprof_disable
*/
public function shutdownProfiler() {
$data = xhprof_disable();
$data = serialize($data);
Filesystem::writeFile($this->getArg('xprofile'), $data);
}
}

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