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So far i have attempted to use regular expressions to do the validation. Does anyone have any idea how to go about this? Is this the right path?
<html>
<head></head>
<body>
<form id="codeEntry" method="post">
<input type="submit" value="validate"></input>
<br />
<textarea rows="40" cols="100" name="txtCode"></textarea>
<br />
<input type="submit" value="validate"></input>
<br />
<?php
$keywords = array("int","float", "char", "long", "void");
//array of preprocessor and their regular expressions
$prepro = array("define", "include", "ifdef", "ifndef");
$preprof = array("/\A(?: |#define){1,2}[\t ]{1,2}[_A-Z]{3,10}(?: (?: )?)[0-9]+\s*$/",
'/\A#include(?: (?: )?)<[\".a-z]+>\s*$/');
//get input code
$input = $_POST["txtCode"];
//attempting to ignore comments
$regex = "/((?:\/\*(?:[^*]|(?:\*+[^*\/]))*\*+\/)|(?:\/\/.*))/";
$input = preg_replace($regex , "", $input);
//check for extra brackets
checkBrackets($input);
//get rid of extra backslash
$input = str_replace(chr(92) . chr(34), chr(34), $input);
//get each line separate in a string array
$lines = explode(chr(13) . chr(10), $input);
//init line count index
$i = 1;
/*-----------debug------------*/
//echo "<textarea rows=\"80\" cols=\"150\" name=\"txt\" >" . $input . "</textarea>";
//printf("line, length, last, string");
/*---------------------------*/
echo sizeof($lines);
echo "<table border=\"1\">";
foreach ($lines as $s){
$length = strlen($s);
if (strlen($s) == 0){
}
//look for pre - processor directive
else if (ord(substr($s, 0, 1)) == 35){
echo "pre processor on line " . $i . "<br />";
$j = 0;
foreach ($prepro as $curpp){
if (strpos($s, $curpp) <> false){
//echo $curpp . " " . $j;
// echo $preprof[$j] . "<br />";
if (preg_match($preprof[$j], $s)){
echo "hello worked" . "<br />";
}
break;
}
//echo $j . " " . $i . "<br />";
$j++;
}
// echo "<span style=\"background-color:#FF0000\"> $s </span>";
}
//error --- unknown code
else if (preg_match("/\A[a-z]{1,6} [Sa-z]{1,7}\* [S_a-z]{1,12}\(\Z/", $s)){
echo "function begin on line " . $i . "<br />";
//echo "<div style=\"color:#FF0000;\">ERROR FOUND ON LINE" . $i . "</div>";
}
/*/if line is commented ignore the line
if (strpos($s, "//") <> false){
echo "single line comment on line " . $i . "<br />";
}
if (strpos($s, "/*")){
echo "multi line comment on line " . $i . "<br />";
}*/
//debug output
printTblRow($i++, $length, $s);
}
echo "</table>";
//echo ord(substr($input, 0, 5));
//echo ord(substr($input, 1, 5));
function printTblRow($i, $length, $s){
echo "<tr>";
//printf("<td>%d </td><td>%d </td><td> %s</td>", $i++, $length, $s);
$print = makeHTMLPrintable($s);
echo "<td>" . $i . "</td><td>" . $length . "</td><td>" . $print ." </td>";
// echo $i++ . " " . $s . " | length " . $length . "<br />";
echo "</tr>";
}
function removeComments($code){
return $code;
}
function makeHTMLPrintable($line){
$print = str_replace("<", "<", $line);
//$print = str_replace(">", ">", $line);
$print = str_replace(">", ">", $print);
return $print;
}
function checkBrackets($input){
$noOpeningBrace = substr_count($input, '(');
$noClosingBrace = substr_count($input, ')');
$open = array();
//echo $noOpeningBrace;
if ($noClosingBrace != $noOpeningBrace){
echo "ERROR BRACE MISMATCH" . "<br />";
}
$line = 1;
for($i=0; $i<strlen($input); $i++){
if ($input[$i] == chr(13)){
$line++;
}
if (($input[$i] === "(") || ($input[$i] === "{")){
//echo $input[$i];
array_push($open, $input[$i]);
//echo "Test <br />";
}
if ($input[$i] === ")"){
//echo $input[$i] . "<br />";
// echo "array " . count($open) . "<br />";
$pops = array_pop($open);
if ($pops != "("){
if ($pops != null){
echo "Extra $pops at line $line<br />";
}
else{
echo "Mismatch ) at line $line<br />";
}//end if else
}//end if(pops
// echo array_pop($open) . "<br />";
// echo "array " . count($open) . "<br />";
}
if ($input[$i] === "}"){
$pops = array_pop($open);
if ($pops != "{"){
if ($pops != null){
echo "Extra $pops at line $line<br />";
}
else{
echo "Mismatch } at line $line<br />";
}//end if else
}//end if(pops
}//end if (input
}//end for
}//end function
?>
</form>
</body>
</html>
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