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PhutilCLikeCodeSnippetContextFreeGrammar.php
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Created
Tue, Jan 7, 03:34

PhutilCLikeCodeSnippetContextFreeGrammar.php
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<?php
/**
* Generates valid context-free code for most programming languages that could
* pass as C. Except for PHP. But includes Java (mostly).
*/
abstract class PhutilCLikeCodeSnippetContextFreeGrammar
extends PhutilCodeSnippetContextFreeGrammar {
protected function buildRuleSet() {
return array(
$this->getStmtTerminationGrammarSet(),
$this->getVarNameGrammarSet(),
$this->getNullExprGrammarSet(),
$this->getNumberGrammarSet(),
$this->getExprGrammarSet(),
$this->getCondGrammarSet(),
$this->getLoopGrammarSet(),
$this->getStmtGrammarSet(),
$this->getAssignmentGrammarSet(),
$this->getArithExprGrammarSet(),
$this->getBoolExprGrammarSet(),
$this->getBoolValGrammarSet(),
$this->getTernaryExprGrammarSet(),
$this->getFuncNameGrammarSet(),
$this->getFuncCallGrammarSet(),
$this->getFuncCallParamGrammarSet(),
$this->getFuncDeclGrammarSet(),
$this->getFuncParamGrammarSet(),
$this->getFuncBodyGrammarSet(),
$this->getFuncReturnGrammarSet(),
);
}
protected function getStartGrammarSet() {
$start_grammar = parent::getStartGrammarSet();
$start_grammar['start'][] = '[funcdecl]';
return $start_grammar;
}
protected function getStmtTerminationGrammarSet() {
return $this->buildGrammarSet('term', array(';'));
}
protected function getFuncCallGrammarSet() {
return $this->buildGrammarSet('funccall',
array(
'[funcname]([funccallparam])',
));
}
protected function getFuncCallParamGrammarSet() {
return $this->buildGrammarSet('funccallparam',
array(
'',
'[expr]',
'[expr], [expr]',
));
}
protected function getFuncDeclGrammarSet() {
return $this->buildGrammarSet('funcdecl',
array(
'function [funcname]([funcparam]) '.
'{[funcbody, indent, block, trim=right]}',
));
}
protected function getFuncParamGrammarSet() {
return $this->buildGrammarSet('funcparam',
array(
'',
'[varname]',
'[varname], [varname]',
'[varname], [varname], [varname]',
));
}
protected function getFuncBodyGrammarSet() {
return $this->buildGrammarSet('funcbody',
array(
"[stmt]\n[stmt]\n[funcreturn]",
"[stmt]\n[stmt]\n[stmt]\n[funcreturn]",
"[stmt]\n[stmt]\n[stmt]\n[stmt]\n[funcreturn]",
));
}
protected function getFuncReturnGrammarSet() {
return $this->buildGrammarSet('funcreturn',
array(
'return [expr][term]',
'',
));
}
// Not really C, but put it here because of the curly braces and mostly shared
// among Java and PHP
protected function getClassDeclGrammarSet() {
return $this->buildGrammarSet('classdecl',
array(
'[classinheritancemod] class [classname] {[classbody, indent, block]}',
'class [classname] {[classbody, indent, block]}',
));
}
protected function getClassNameGrammarSet() {
return $this->buildGrammarSet('classname',
array(
'MuffinHouse',
'MuffinReader',
'MuffinAwesomizer',
'SuperException',
'Librarian',
'Book',
'Ball',
'BallOfCode',
'AliceAndBobsSharedSecret',
'FileInputStream',
'FileOutputStream',
'BufferedReader',
'BufferedWriter',
'Cardigan',
'HouseOfCards',
'UmbrellaClass',
'GenericThing',
));
}
protected function getClassBodyGrammarSet() {
return $this->buildGrammarSet('classbody',
array(
'[methoddecl]',
"[methoddecl]\n\n[methoddecl]",
"[propdecl]\n[propdecl]\n\n[methoddecl]\n\n[methoddecl]",
"[propdecl]\n[propdecl]\n[propdecl]\n\n[methoddecl]\n\n[methoddecl]".
"\n\n[methoddecl]",
));
}
protected function getVisibilityGrammarSet() {
return $this->buildGrammarSet('visibility',
array(
'private',
'protected',
'public',
));
}
protected function getClassInheritanceModGrammarSet() {
return $this->buildGrammarSet('classinheritancemod',
array(
'final',
'abstract',
));
}
// Keeping this separate so we won't give abstract methods a function body
protected function getMethodInheritanceModGrammarSet() {
return $this->buildGrammarSet('methodinheritancemod',
array(
'final',
));
}
protected function getMethodDeclGrammarSet() {
return $this->buildGrammarSet('methoddecl',
array(
'[visibility] [methodfuncdecl]',
'[visibility] [methodfuncdecl]',
'[methodinheritancemod] [visibility] [methodfuncdecl]',
'[abstractmethoddecl]',
));
}
protected function getMethodFuncDeclGrammarSet() {
return $this->buildGrammarSet('methodfuncdecl',
array(
'function [funcname]([funcparam]) '.
'{[methodbody, indent, block, trim=right]}',
));
}
protected function getMethodBodyGrammarSet() {
return $this->buildGrammarSet('methodbody',
array(
"[methodstmt]\n[methodbody]",
"[methodstmt]\n[funcreturn]",
));
}
protected function getMethodStmtGrammarSet() {
$stmts = $this->getStmtGrammarSet();
return $this->buildGrammarSet('methodstmt',
array_merge(
$stmts['stmt'],
array(
'[methodcall][term]',
)));
}
protected function getMethodCallGrammarSet() {
// Java/JavaScript
return $this->buildGrammarSet('methodcall',
array(
'this.[funccall]',
'[varname].[funccall]',
'[classname].[funccall]',
));
}
protected function getAbstractMethodDeclGrammarSet() {
return $this->buildGrammarSet('abstractmethoddecl',
array(
'abstract function [funcname]([funcparam])[term]',
));
}
protected function getPropDeclGrammarSet() {
return $this->buildGrammarSet('propdecl',
array(
'[visibility] [varname][term]',
));
}
protected function getClassRuleSets() {
return array(
$this->getClassInheritanceModGrammarSet(),
$this->getMethodInheritanceModGrammarSet(),
$this->getClassDeclGrammarSet(),
$this->getClassNameGrammarSet(),
$this->getClassBodyGrammarSet(),
$this->getMethodDeclGrammarSet(),
$this->getMethodFuncDeclGrammarSet(),
$this->getMethodBodyGrammarSet(),
$this->getMethodStmtGrammarSet(),
$this->getMethodCallGrammarSet(),
$this->getAbstractMethodDeclGrammarSet(),
$this->getPropDeclGrammarSet(),
$this->getVisibilityGrammarSet(),
);
}
public function generateClass() {
$rules = array_merge($this->getRules(), $this->getClassRuleSets());
$rules['start'] = array('[classdecl]');
$count = 0;
return $this->applyRules('[start]', $count, $rules);
}
}

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