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<?php
require '../vendor/nikic/php-parser/lib/bootstrap.php';
function dbg($indent, $text) {
for($i=0;$i<$indent;$i++) echo ".";
echo "$text\n";
}
abstract class AbstractWeaver {
protected $parser;
protected $nodeDumper;
protected $prettyPrinter;
protected $ast_dump_before_walk;
protected $ast_dump_after_walk;
public function __construct() {
$this->parser = new PHPParser_Parser(new PHPParser_Lexer);
$this->nodeDumper = new PHPParser_NodeDumper;
$this->prettyPrinter = new PHPParser_PrettyPrinter_Zend;
$this->ast_dump_before_walk="";
$this->ast_dump_after_walk="";
}
public function setASTDumpFiles($ast_dump_before_walk, $ast_dump_after_walk) {
// Set file to "" to prevent AST dumping
$this->$ast_dump_before_walk=$ast_dump_before_walk;
$this->$ast_dump_after_walk=$ast_dump_after_walk;
}
public function runAllSteps($sourcetree_rootpath, $cache_path, $result_path) {
try {
$step='detectFramework';
$fw_props=$this->detectFramework($sourcetree_rootpath);
$step='parseFrameworkConfig';
$fw_conf=$this->parseFrameworkConfig($fw_props);
$step='parseFrameworkCode';
$fw_extra=$this->parseFrameworkCode($fw_props, $fw_conf, $cache_path);
$step='parseApplicationCode';
$app_extra=$this->parseApplicationCode($fw_props, $fw_conf, $fw_extra, $cache_path);
$step='computePageList';
$app_pages=$this->computePageList($fw_props, $fw_conf, $fw_extra, $app_extra);
$step='outputMappingFile';
$this->outputMappingFile($app_pages, $result_path);
foreach ($app_pages as $page=>$page_props) {
$step="makePageFullAST of '$page'";
$page_full_ast=$this->makePageFullAST($page, $page_props, $fw_props, $fw_conf, $fw_extra, $app_extra, $cache_path);
$step="analysePageAST of '$page'";
$page_annotated_ast=$this->analysePageAST($page_full_ast, $page, $page_props, $fw_props, $fw_conf, $fw_extra, $app_extra, $cache_path);
$step="throwDeadCode of '$page'";
$this->throwDeadCode($page_annotated_ast);
$step="weaveCode of '$page'";
$out_ast=$this->weaveCode($page_annotated_ast);
$page_dest_path=$this->makeDestPath($page, $result_path);
$step="prettyPrint to '$page_dest_path'";
$this->prettyPrint($out_ast, $page_dest_path);
}
} catch (Exception $e) {
echo "Step '$step' failure : ", $e->getMessage();
}
}
public function makeDestPath($page, $result_path) {
return $result_path . '/' . str_replace('/', '_', $page) . ".php";
}
public function parseAndWalk($src_filepath, $traverser, $env=array(), $level=0) {
/* Parse a file et traverse the AST.
* Could be recursive if a traverser call again parseAndWalk
* for example when finding a include() directive.
* The main call should be in this case :
* $w=new XXXWeaver;
* $nv=new NodeVisitor_YYY($w); // The node visitor
* $t=new PHPParser_NodeTraverser; $t->addVisitor($nv);
* w->parseAndWalk($src_mainfile, $t, array('cwd'=>dirname($src_mainfile));
*/
try {
dbg($level,"Parsing '$src_filepath'");
$stmts = $this->parser->parse(file_get_contents($src_filepath));
$this->dumpAST($stmts, $src_filepath, $this->ast_dump_before_walk);
if ($traverser) {
dbg($level,"Transforming '$src_filepath'");
$stmts = $traverser->traverse($stmts);
$traverser=null; //Destroy
}
$this->dumpAST($stmts, $src_filepath, $this->ast_dump_after_walk);
} catch (PHPParser_Error $e) {
echo 'Parse Error: ', $e->getMessage();
}
return $stmts;
}
public function staticEvalDefine($ast, $magics, $previous_constants=null) {
if ($previous_constants==null) {
$constants=array('DIRECTORY_SEPARATOR' => DIRECTORY_SEPARATOR);
} else {
$constants=$previous_constants;
}
while($stmt=array_shift($ast)) {
if ($stmt instanceof PHPParser_Node_Stmt_If) {
//TODO try to eval statically the cond
if (1) {
$constants += $this->staticEvalDefine($stmt->stmts, $magics, $constants);
}
} elseif ($stmt instanceof PHPParser_Node_Expr_FuncCall) {
if ( $stmt->name->parts === array('define') ) {
$k=$this->staticReduce($stmt->args[0], $constants, $magics);
$v=$this->staticReduce($stmt->args[1], $constants, $magics);
if ($k instanceof PHPParser_Node_Scalar_String && $v instanceof PHPParser_Node_Scalar_String) {
$k=$k->value;
$v=$v->value;
dbg(0,"Found '$k' => '$v'");
$constants[$k]=$v;
}
} else {
dbg(0,"Skipped funcall: " . $this->prettyPrinter->prettyPrint(array($stmt)));
}
} else {
dbg(0,"Skipped : " . get_class($stmt));
}
}
return $constants;
}
public function staticReduce($stmt, $constants, $magics, $level=0) {
//dbg($level,'staticReduce(<'.get_class($stmt).'>, $constants, $magics)');
// Condition de sortie
if ($stmt instanceof PHPParser_Node_Scalar_String) return $stmt;
// Propagation d'erreur
if (is_integer($stmt)) return $stmt;
// Cas nominal, action selon type de noeud
if ($stmt instanceof PHPParser_Node_Expr_FuncCall) {
// Support some string manipulation funcs
if ( count($stmt->name->parts)===1 ) {
$func=$stmt->name->parts[0];
switch($func) {
// Unary context insensitive funcs
case 'dirname':
case 'basename':
$arg=$this->staticReduce($stmt->args[0], $constants, $magics, $level+1);
if ($arg instanceof PHPParser_Node_Scalar_String) {
$res=$func($arg->value); //Real call !!
return new PHPParser_Node_Scalar_String($res);
}
break;
default:
dbg(0,"Unsupported func '$func'");
return 1;
}
} else {
dbg(0,"Unknown multipart funcname");
return 2;
}
} elseif ($stmt instanceof PHPParser_Node_Arg) {
// Unbox arguments, ignoring by ref things (static context)
return $this->staticReduce($stmt->value, $constants, $magics, $level+1);
} elseif ($stmt instanceof PHPParser_Node_Expr_Concat) {
$l=$this->staticReduce($stmt->left, $constants, $magics, $level+1);
if (! $l instanceof PHPParser_Node_Scalar_String) {
return $l;
}
$r=$this->staticReduce($stmt->right, $constants, $magics, $level+1);
if (! $r instanceof PHPParser_Node_Scalar_String) {
return $r;
}
return new PHPParser_Node_Scalar_String($l->value . $r->value);
} elseif ($stmt instanceof PHPParser_Node_Expr_ConstFetch) {
//TODO : a ConstFetch could be have more than one part in his name ?
// What glue between pieces ??
//$k=$this->prettyPrinter->prettyPrint(array($stmt));
$k=$stmt->name->parts[0];
if (array_key_exists($k, $constants)) {
return new PHPParser_Node_Scalar_String($constants[$k]);
} else {
dbg(0,"ConstFetch failed for '$k'");
return 3;
}
} elseif ($stmt instanceof PHPParser_Node_Scalar_FileConst) {
$k='__FILE__';
if (array_key_exists($k, $magics)) {
return new PHPParser_Node_Scalar_String($magics[$k]);
} else {
dbg(0,"Magic evaluation failed for '$k'");
return 4;
}
}
}
public function prettyPrint($ast, $dest_filepath) {
dbg(0,"Outputing '$dest_filepath'");
file_put_contents($dest_filepath, "<?php\n" . $this->prettyPrinter->prettyPrint($ast) . "\n");
}
public function dumpAST($ast, $ast_title, $dest_filepath) {
if (is_array($ast) && strlen($dest_filepath) > 0 ) {
dbg($level,"Dumping '$ast_title,' AST to '$dest_filepath'");
file_put_contents($dest_filepath, $this->nodeDumper->dump($ast));
}
}
// Framework specific code
abstract public function detectFramework($sourcetree_rootpath);
abstract public function parseFrameworkConfig($fw_props);
abstract public function parseFrameworkCode($fw_props, $fw_conf, $cache_path);
abstract public function parseApplicationCode($fw_props, $fw_conf, $fw_extra, $cache_path);
abstract public function computePageList($fw_props, $fw_conf, $fw_extra, $app_extra);
abstract public function outputMappingFile($app_pages, $result_path);
abstract public function makePageFullAST($page, $page_props, $fw_props, $fw_conf, $fw_extra, $app_extra, $cache_path);
abstract public function analysePageAST($page_full_ast, $page, $page_props, $fw_props, $fw_conf, $fw_extra, $app_extra, $cache_path);
abstract public function throwDeadCode(&$page_annotated_ast);
abstract public function weaveCode($page_annotated_ast);
}
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