PhutilCodeSnippetContextFreeGrammar.php
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	<?php

	/**
	* Generates non-sense code snippets according to context-free rules, respecting
	* indentation etc.
	*
	* Also provides a common ruleset shared among many mainstream programming
	* languages (that is, not Lisp).
	*/
	abstract class PhutilCodeSnippetContextFreeGrammar
	extends PhutilContextFreeGrammar {

	public function generate() {
	// A trailing newline is favorable for source code
	return trim(parent::generate())."\n";
	}

	final protected function getRules() {
	return array_merge(
	$this->getStartGrammarSet(),
	$this->getStmtGrammarSet(),
	array_mergev($this->buildRuleSet()));
	}

	abstract protected function buildRuleSet();

	protected function buildGrammarSet($name, array $set) {
	return array(
	$name => $set,
	);
	}

	protected function getStartGrammarSet() {
	return $this->buildGrammarSet('start',
	array(
	"[stmt]\n[stmt]",
	"[stmt]\n[stmt]\n[stmt]",
	"[stmt]\n[stmt]\n[stmt]\n[stmt]",
	));
	}

	protected function getStmtGrammarSet() {
	return $this->buildGrammarSet('stmt',
	array(
	'[assignment][term]',
	'[assignment][term]',
	'[assignment][term]',
	'[assignment][term]',
	'[funccall][term]',
	'[funccall][term]',
	'[funccall][term]',
	'[funccall][term]',
	'[cond]',
	'[loop]',
	));
	}

	protected function getFuncNameGrammarSet() {
	return $this->buildGrammarSet('funcname',
	array(
	'do_something',
	'nonempty',
	'noOp',
	'call_user_func',
	'getenv',
	'render',
	'super',
	'derpify',
	'awesomize',
	'equals',
	'run',
	'flee',
	'fight',
	'notify',
	'listen',
	'calculate',
	'aim',
	'open',
	));
	}

	protected function getVarNameGrammarSet() {
	return $this->buildGrammarSet('varname',
	array(
	'is_something',
	'object',
	'name',
	'token',
	'label',
	'piece_of_the_pie',
	'type',
	'state',
	'param',
	'action',
	'key',
	'timeout',
	'result',
	));
	}

	protected function getNullExprGrammarSet() {
	return $this->buildGrammarSet('null', array('null'));
	}

	protected function getNumberGrammarSet() {
	return $this->buildGrammarSet('number',
	array(
	mt_rand(-1, 100),
	mt_rand(-100, 1000),
	mt_rand(-1000, 5000),
	mt_rand(0, 1).'.'.mt_rand(1, 1000),
	mt_rand(0, 50).'.'.mt_rand(1, 1000),
	));
	}

	protected function getExprGrammarSet() {
	return $this->buildGrammarSet('expr',
	array(
	'[null]',
	'[number]',
	'[number]',
	'[varname]',
	'[varname]',
	'[boolval]',
	'[boolval]',
	'[boolexpr]',
	'[boolexpr]',
	'[funccall]',
	'[arithexpr]',
	'[arithexpr]',
	// Some random strings
	'"'.Filesystem::readRandomCharacters(4).'"',
	'"'.Filesystem::readRandomCharacters(5).'"',
	));
	}

	protected function getBoolExprGrammarSet() {
	return $this->buildGrammarSet('boolexpr',
	array(
	'[varname]',
	'![varname]',
	'[varname] == [boolval]',
	'[varname] != [boolval]',
	'[ternary]',
	));
	}

	protected function getBoolValGrammarSet() {
	return $this->buildGrammarSet('boolval',
	array(
	'true',
	'false',
	));
	}

	protected function getArithExprGrammarSet() {
	return $this->buildGrammarSet('arithexpr',
	array(
	'[varname]++',
	'++[varname]',
	'[varname] + [number]',
	'[varname]--',
	'--[varname]',
	'[varname] - [number]',
	));
	}

	protected function getAssignmentGrammarSet() {
	return $this->buildGrammarSet('assignment',
	array(
	'[varname] = [expr]',
	'[varname] = [arithexpr]',
	'[varname] += [expr]',
	));
	}

	protected function getCondGrammarSet() {
	return $this->buildGrammarSet('cond',
	array(
	'if ([boolexpr]) {[stmt, indent, block]}',
	'if ([boolexpr]) {[stmt, indent, block]} else {[stmt, indent, block]}',
	));
	}

	protected function getLoopGrammarSet() {
	return $this->buildGrammarSet('loop',
	array(
	'while ([boolexpr]) {[stmt, indent, block]}',
	'do {[stmt, indent, block]} while ([boolexpr])[term]',
	'for ([assignment]; [boolexpr]; [expr]) {[stmt, indent, block]}',
	));
	}

	protected function getTernaryExprGrammarSet() {
	return $this->buildGrammarSet('ternary',
	array(
	'[boolexpr] ? [expr] : [expr]',
	));
	}

	protected function getStmtTerminationGrammarSet() {
	return $this->buildGrammarSet('term', array(''));
	}

	}

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