72 lines
2.5 KiB
PHP
72 lines
2.5 KiB
PHP
<?php
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namespace GraphQL\Error;
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use GraphQL\Language\Source;
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use GraphQL\Language\SourceLocation;
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class SyntaxError extends Error
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{
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/**
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* @param Source $source
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* @param int $position
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* @param string $description
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*/
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public function __construct(Source $source, $position, $description)
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{
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$location = $source->getLocation($position);
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$line = $location->line + $source->locationOffset->line - 1;
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$columnOffset = self::getColumnOffset($source, $location);
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$column = $location->column + $columnOffset;
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$syntaxError =
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"Syntax Error {$source->name} ({$line}:{$column}) $description\n" .
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"\n".
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self::highlightSourceAtLocation($source, $location);
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parent::__construct($syntaxError, null, $source, [$position]);
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}
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/**
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* @param Source $source
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* @param SourceLocation $location
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* @return string
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*/
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public static function highlightSourceAtLocation(Source $source, SourceLocation $location)
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{
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$line = $location->line;
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$lineOffset = $source->locationOffset->line - 1;
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$columnOffset = self::getColumnOffset($source, $location);
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$contextLine = $line + $lineOffset;
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$prevLineNum = (string) ($contextLine - 1);
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$lineNum = (string) $contextLine;
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$nextLineNum = (string) ($contextLine + 1);
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$padLen = mb_strlen($nextLineNum, 'UTF-8');
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$unicodeChars = json_decode('"\u2028\u2029"'); // Quick hack to get js-compatible representation of these chars
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$lines = preg_split('/\r\n|[\n\r' . $unicodeChars . ']/su', $source->body);
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$whitespace = function ($len) {
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return str_repeat(' ', $len);
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};
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$lpad = function ($len, $str) {
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return str_pad($str, $len - mb_strlen($str, 'UTF-8') + 1, ' ', STR_PAD_LEFT);
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};
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$lines[0] = $whitespace($source->locationOffset->column - 1) . $lines[0];
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return
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($line >= 2 ? $lpad($padLen, $prevLineNum) . ': ' . $lines[$line - 2] . "\n" : '') .
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($lpad($padLen, $lineNum) . ': ' . $lines[$line - 1] . "\n") .
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($whitespace(2 + $padLen + $location->column - 1 + $columnOffset) . "^\n") .
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($line < count($lines) ? $lpad($padLen, $nextLineNum) . ': ' . $lines[$line] . "\n" : '');
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}
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public static function getColumnOffset(Source $source, SourceLocation $location)
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{
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return $location->line === 1 ? $source->locationOffset->column - 1 : 0;
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}
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}
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