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PhutilCodeSnippetContextFreeGrammar.php
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Mon, Nov 25, 10:12

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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