138 lines
3.2 KiB
PHP
138 lines
3.2 KiB
PHP
<?php
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// Loads the SQL lexer and parser, which are used to parse this error to detect
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// any errors.
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require_once 'libraries/sql-parser/autoload.php';
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/**
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* Gets the starting position of each line.
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*
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* @param string $str String to be analyzed.
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*
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* @return array
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*/
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function getLines($str)
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{
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$lines = array(0);
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for ($i = 0, $len = strlen($str); $i < $len; ++$i) {
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if ($str[$i] === "\n") {
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$lines[] = $i;
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}
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}
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return $lines;
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}
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/**
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* Computes the number of the line and column given an absolute position.
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*
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* @param array $lines The starting position of each line.
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* @param int $pos The absolute position
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*
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* @return void
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*/
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function findLineNumberAndColumn($lines, $pos)
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{
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$line = 0;
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foreach ($lines as $lineNo => $lineStart) {
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if ($lineStart >= $pos) {
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break;
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}
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$line = $lineNo;
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}
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return array($line, $pos - $lines[$line]);
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}
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/**
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* Runs the linting process.
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*
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* @param string $query The query to be checked.
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*
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* @return void
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*/
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function linter($query)
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{
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// Disabling lint for huge queries to save some resources.
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if (strlen($query) > 10000) {
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echo json_encode(
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array(
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array(
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'message' => 'The linting is disabled for this query because it exceededs the maxmimum length',
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'fromLine' => 0,
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'fromColumn' => 0,
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'toLine' => 0,
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'toColumn' => 0,
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'severity' => 'warning',
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)
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)
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);
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return;
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}
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/**
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* Lexer used for tokenizing the query.
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*
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* @var SqlParser\Lexer
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*/
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$lexer = new SqlParser\Lexer($query);
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/**
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* Parsed used for analysing the query.
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*
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* @var SqlParser\Parser
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*/
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$parser = new SqlParser\Parser($lexer->list);
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/**
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* Array containing all errors.
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*
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* @var array
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*/
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$errors = SqlParser\Utils\Error::get(array($lexer, $parser));
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/**
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* The response containing of all errors.
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*
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* @var array
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*/
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$response = array();
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/**
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* The starting position for each line.
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*
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* CodeMirror requires relative position to line, but the parser stores
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* only the absolute position of the character in string.
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*
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* @var array
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*/
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$lines = getLines($query);
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// Building the response.
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foreach ($errors as $idx => $error) {
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// Starting position of the string that caused the error.
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list($fromLine, $fromColumn) = findLineNumberAndColumn(
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$lines, $error[3]
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);
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// Ending position of the string that caused the error.
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list($toLine, $toColumn) = findLineNumberAndColumn(
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$lines, $error[3] + strlen($error[2])
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);
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// Building the response.
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$response[] = array(
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'message' => $error[0] . ' (near ' . $error[2] . ')',
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'fromLine' => $fromLine,
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'fromColumn' => $fromColumn,
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'toLine' => $toLine,
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'toColumn' => $toColumn,
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'severity' => 'error',
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);
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}
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// Sending back the answer.
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echo json_encode($response);
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}
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linter($_REQUEST['sql_query']);
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