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<?php
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declare(strict_types=1);
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/**
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* Copyright (c) 2018-2020 Andreas Möller
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*
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* For the full copyright and license information, please view
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* the LICENSE.md file that was distributed with this source code.
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*
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* @see https://github.com/ergebnis/json-printer
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*/
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namespace Ergebnis\Json\Printer;
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final class Printer implements PrinterInterface
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{
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/**
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* This code is adopted from composer/composer (originally licensed under MIT by Nils Adermann <naderman@naderman.de>
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* and Jordi Boggiano <j.boggiano@seld.be>), who adopted it from a blog post by Dave Perrett (originally licensed
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* under MIT by Dave Perrett <mail@recursive-design.com>).
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*
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* The primary objective of the adoption is
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*
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* - turn static method into an instance method
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* - allow to specify indent
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* - allow to specify new-line character sequence
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*
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* If you observe closely, the options for un-escaping unicode characters and slashes have been removed. Since this
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* package requires PHP 7, there is no need to implement this in user-land code.
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*
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* @see https://github.com/composer/composer/blob/1.6.0/src/Composer/Json/JsonFormatter.php#L25-L126
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* @see https://www.daveperrett.com/articles/2008/03/11/format-json-with-php/
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* @see http://php.net/manual/en/function.json-encode.php
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* @see http://php.net/manual/en/json.constants.php
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*
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* @param string $json
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* @param string $indent
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* @param string $newLine
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*
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* @throws \InvalidArgumentException
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*
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* @return string
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*/
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public function print(string $json, string $indent = ' ', string $newLine = \PHP_EOL): string
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{
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if (null === \json_decode($json) && \JSON_ERROR_NONE !== \json_last_error()) {
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throw new \InvalidArgumentException(\sprintf(
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'"%s" is not valid JSON.',
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$json
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));
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}
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if (1 !== \preg_match('/^( +|\t+)$/', $indent)) {
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throw new \InvalidArgumentException(\sprintf(
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'"%s" is not a valid indent.',
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$indent
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));
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}
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if (1 !== \preg_match('/^(?>\r\n|\n|\r)$/', $newLine)) {
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throw new \InvalidArgumentException(\sprintf(
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'"%s" is not a valid new-line character sequence.',
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$newLine
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));
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}
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$printed = '';
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$indentLevel = 0;
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$length = \mb_strlen($json);
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$withinStringLiteral = false;
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$stringLiteral = '';
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$noEscape = true;
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for ($i = 0; $i < $length; ++$i) {
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/**
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* Grab the next character in the string.
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*/
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$character = \mb_substr($json, $i, 1);
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/**
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* Are we inside a quoted string literal?
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*/
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if ('"' === $character && $noEscape) {
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$withinStringLiteral = !$withinStringLiteral;
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}
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/**
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* Collect characters if we are inside a quoted string literal.
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*/
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if ($withinStringLiteral) {
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$stringLiteral .= $character;
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$noEscape = '\\' === $character ? !$noEscape : true;
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continue;
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}
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/**
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* Process string literal if we are about to leave it.
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*/
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if ('' !== $stringLiteral) {
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$printed .= $stringLiteral . $character;
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$stringLiteral = '';
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continue;
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}
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/**
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* Ignore whitespace outside of string literal.
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*/
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if ('' === \trim($character)) {
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continue;
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}
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/**
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* Ensure space after ":" character.
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*/
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if (':' === $character) {
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$printed .= ': ';
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continue;
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}
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/**
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* Output a new line after "," character and and indent the next line.
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*/
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if (',' === $character) {
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$printed .= $character . $newLine . \str_repeat($indent, $indentLevel);
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continue;
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}
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/**
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* Output a new line after "{" and "[" and indent the next line.
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*/
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if ('{' === $character || '[' === $character) {
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++$indentLevel;
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$printed .= $character . $newLine . \str_repeat($indent, $indentLevel);
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continue;
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}
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/**
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* Output a new line after "}" and "]" and indent the next line.
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*/
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if ('}' === $character || ']' === $character) {
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--$indentLevel;
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$trimmed = \rtrim($printed);
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$previousNonWhitespaceCharacter = \mb_substr($trimmed, -1);
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/**
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* Collapse empty {} and [].
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*/
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if ('{' === $previousNonWhitespaceCharacter || '[' === $previousNonWhitespaceCharacter) {
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$printed = $trimmed . $character;
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continue;
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}
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$printed .= $newLine . \str_repeat($indent, $indentLevel);
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}
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$printed .= $character;
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}
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return $printed;
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}
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}
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localheinz