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