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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Serializer\Encoder;
use Symfony\Component\Serializer\Exception\InvalidArgumentException;
use Symfony\Component\Serializer\Exception\UnexpectedValueException;
/**
* Encodes CSV data.
*
* @author Kévin Dunglas <[email protected]>
* @author Oliver Hoff <[email protected]>
*/
class CsvEncoder implements EncoderInterface, DecoderInterface
{
public const FORMAT = 'csv';
public const DELIMITER_KEY = 'csv_delimiter';
public const ENCLOSURE_KEY = 'csv_enclosure';
public const ESCAPE_CHAR_KEY = 'csv_escape_char';
public const KEY_SEPARATOR_KEY = 'csv_key_separator';
public const HEADERS_KEY = 'csv_headers';
public const ESCAPE_FORMULAS_KEY = 'csv_escape_formulas';
public const AS_COLLECTION_KEY = 'as_collection';
public const NO_HEADERS_KEY = 'no_headers';
public const END_OF_LINE = 'csv_end_of_line';
public const OUTPUT_UTF8_BOM_KEY = 'output_utf8_bom';
private const UTF8_BOM = "\xEF\xBB\xBF";
private $formulasStartCharacters = ['=', '-', '+', '@'];
private $defaultContext = [
self::DELIMITER_KEY => ',',
self::ENCLOSURE_KEY => '"',
self::ESCAPE_CHAR_KEY => '',
self::END_OF_LINE => "\n",
self::ESCAPE_FORMULAS_KEY => false,
self::HEADERS_KEY => [],
self::KEY_SEPARATOR_KEY => '.',
self::NO_HEADERS_KEY => false,
self::AS_COLLECTION_KEY => true,
self::OUTPUT_UTF8_BOM_KEY => false,
];
public function __construct(array $defaultContext = [])
{
$this->defaultContext = array_merge($this->defaultContext, $defaultContext);
if (\PHP_VERSION_ID < 70400 && '' === $this->defaultContext[self::ESCAPE_CHAR_KEY]) {
$this->defaultContext[self::ESCAPE_CHAR_KEY] = '\\';
}
}
/**
* {@inheritdoc}
*/
public function encode($data, string $format, array $context = [])
{
$handle = fopen('php://temp,', 'w+');
if (!is_iterable($data)) {
$data = [[$data]];
} elseif (empty($data)) {
$data = [[]];
} else {
// Sequential arrays of arrays are considered as collections
$i = 0;
foreach ($data as $key => $value) {
if ($i !== $key || !\is_array($value)) {
$data = [$data];
break;
}
++$i;
}
}
[$delimiter, $enclosure, $escapeChar, $keySeparator, $headers, $escapeFormulas, $outputBom] = $this->getCsvOptions($context);
foreach ($data as &$value) {
$flattened = [];
$this->flatten($value, $flattened, $keySeparator, '', $escapeFormulas);
$value = $flattened;
}
unset($value);
$headers = array_merge(array_values($headers), array_diff($this->extractHeaders($data), $headers));
if (!($context[self::NO_HEADERS_KEY] ?? $this->defaultContext[self::NO_HEADERS_KEY])) {
fputcsv($handle, $headers, $delimiter, $enclosure, $escapeChar);
if ("\n" !== ($context[self::END_OF_LINE] ?? $this->defaultContext[self::END_OF_LINE]) && 0 === fseek($handle, -1, \SEEK_CUR)) {
fwrite($handle, $context[self::END_OF_LINE]);
}
}
$headers = array_fill_keys($headers, '');
foreach ($data as $row) {
fputcsv($handle, array_replace($headers, $row), $delimiter, $enclosure, $escapeChar);
if ("\n" !== ($context[self::END_OF_LINE] ?? $this->defaultContext[self::END_OF_LINE]) && 0 === fseek($handle, -1, \SEEK_CUR)) {
fwrite($handle, $context[self::END_OF_LINE]);
}
}
rewind($handle);
$value = stream_get_contents($handle);
fclose($handle);
if ($outputBom) {
if (!preg_match('//u', $value)) {
throw new UnexpectedValueException('You are trying to add a UTF-8 BOM to a non UTF-8 text.');
}
$value = self::UTF8_BOM.$value;
}
return $value;
}
/**
* {@inheritdoc}
*/
public function supportsEncoding(string $format)
{
return self::FORMAT === $format;
}
/**
* {@inheritdoc}
*/
public function decode(string $data, string $format, array $context = [])
{
$handle = fopen('php://temp', 'r+');
fwrite($handle, $data);
rewind($handle);
if (str_starts_with($data, self::UTF8_BOM)) {
fseek($handle, \strlen(self::UTF8_BOM));
}
$headers = null;
$nbHeaders = 0;
$headerCount = [];
$result = [];
[$delimiter, $enclosure, $escapeChar, $keySeparator, , , , $asCollection] = $this->getCsvOptions($context);
while (false !== ($cols = fgetcsv($handle, 0, $delimiter, $enclosure, $escapeChar))) {
$nbCols = \count($cols);
if (null === $headers) {
$nbHeaders = $nbCols;
if ($context[self::NO_HEADERS_KEY] ?? $this->defaultContext[self::NO_HEADERS_KEY]) {
for ($i = 0; $i < $nbCols; ++$i) {
$headers[] = [$i];
}
$headerCount = array_fill(0, $nbCols, 1);
} else {
foreach ($cols as $col) {
$header = explode($keySeparator, $col);
$headers[] = $header;
$headerCount[] = \count($header);
}
continue;
}
}
$item = [];
for ($i = 0; ($i < $nbCols) && ($i < $nbHeaders); ++$i) {
$depth = $headerCount[$i];
$arr = &$item;
for ($j = 0; $j < $depth; ++$j) {
// Handle nested arrays
if ($j === ($depth - 1)) {
$arr[$headers[$i][$j]] = $cols[$i];
continue;
}
if (!isset($arr[$headers[$i][$j]])) {
$arr[$headers[$i][$j]] = [];
}
$arr = &$arr[$headers[$i][$j]];
}
}
$result[] = $item;
}
fclose($handle);
if ($asCollection) {
return $result;
}
if (empty($result) || isset($result[1])) {
return $result;
}
// If there is only one data line in the document, return it (the line), the result is not considered as a collection
return $result[0];
}
/**
* {@inheritdoc}
*/
public function supportsDecoding(string $format)
{
return self::FORMAT === $format;
}
/**
* Flattens an array and generates keys including the path.
*/
private function flatten(iterable $array, array &$result, string $keySeparator, string $parentKey = '', bool $escapeFormulas = false)
{
foreach ($array as $key => $value) {
if (is_iterable($value)) {
$this->flatten($value, $result, $keySeparator, $parentKey.$key.$keySeparator, $escapeFormulas);
} else {
if ($escapeFormulas && \in_array(substr((string) $value, 0, 1), $this->formulasStartCharacters, true)) {
$result[$parentKey.$key] = "\t".$value;
} else {
// Ensures an actual value is used when dealing with true and false
$result[$parentKey.$key] = false === $value ? 0 : (true === $value ? 1 : $value);
}
}
}
}
private function getCsvOptions(array $context): array
{
$delimiter = $context[self::DELIMITER_KEY] ?? $this->defaultContext[self::DELIMITER_KEY];
$enclosure = $context[self::ENCLOSURE_KEY] ?? $this->defaultContext[self::ENCLOSURE_KEY];
$escapeChar = $context[self::ESCAPE_CHAR_KEY] ?? $this->defaultContext[self::ESCAPE_CHAR_KEY];
$keySeparator = $context[self::KEY_SEPARATOR_KEY] ?? $this->defaultContext[self::KEY_SEPARATOR_KEY];
$headers = $context[self::HEADERS_KEY] ?? $this->defaultContext[self::HEADERS_KEY];
$escapeFormulas = $context[self::ESCAPE_FORMULAS_KEY] ?? $this->defaultContext[self::ESCAPE_FORMULAS_KEY];
$outputBom = $context[self::OUTPUT_UTF8_BOM_KEY] ?? $this->defaultContext[self::OUTPUT_UTF8_BOM_KEY];
$asCollection = $context[self::AS_COLLECTION_KEY] ?? $this->defaultContext[self::AS_COLLECTION_KEY];
if (!\is_array($headers)) {
throw new InvalidArgumentException(sprintf('The "%s" context variable must be an array or null, given "%s".', self::HEADERS_KEY, get_debug_type($headers)));
}
return [$delimiter, $enclosure, $escapeChar, $keySeparator, $headers, $escapeFormulas, $outputBom, $asCollection];
}
/**
* @return string[]
*/
private function extractHeaders(iterable $data): array
{
$headers = [];
$flippedHeaders = [];
foreach ($data as $row) {
$previousHeader = null;
foreach ($row as $header => $_) {
if (isset($flippedHeaders[$header])) {
$previousHeader = $header;
continue;
}
if (null === $previousHeader) {
$n = \count($headers);
} else {
$n = $flippedHeaders[$previousHeader] + 1;
for ($j = \count($headers); $j > $n; --$j) {
++$flippedHeaders[$headers[$j] = $headers[$j - 1]];
}
}
$headers[$n] = $header;
$flippedHeaders[$header] = $n;
$previousHeader = $header;
}
}
return $headers;
}
}