107 lines
5.8 KiB
PHP
107 lines
5.8 KiB
PHP
<?php declare(strict_types=1);
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namespace PrinsFrank\PdfParser\Document\ContentStream\PositionedText;
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use PrinsFrank\PdfParser\Document\Dictionary\DictionaryValue\Name\EncodingNameValue;
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use PrinsFrank\PdfParser\Document\Document;
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use PrinsFrank\PdfParser\Document\Generic\Character\LiteralStringEscapeCharacter;
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use PrinsFrank\PdfParser\Document\Object\Decorator\Font;
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use PrinsFrank\PdfParser\Document\Object\Decorator\Page;
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use PrinsFrank\PdfParser\Exception\ParseFailureException;
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class PositionedTextElement {
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public function __construct(
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public readonly string $rawTextContent,
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public readonly TransformationMatrix $absoluteMatrix,
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public readonly TextState $textState,
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) {
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}
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public function getFont(Document $document, Page $page): Font {
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if ($this->textState->fontName === null) {
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throw new ParseFailureException('Unable to locate font for text element');
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}
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return $page->getFontDictionary()?->getObjectForReference($document, $this->textState->fontName, Font::class)
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?? throw new ParseFailureException(sprintf('Unable to locate font with reference "/%s"', $this->textState->fontName->value));
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}
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/** @throws ParseFailureException */
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public function getText(Document $document, Page $page): string {
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if (($result = preg_match_all('/(?<chars>(<(\\\\>|[^>])*>)|(\((\\\\\)|[^)])*\)))(?<offset>-?[0-9]+(\.[0-9]+)?)?/', $this->rawTextContent, $matches, PREG_SET_ORDER)) === false) {
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throw new ParseFailureException(sprintf('Error with regex'));
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} elseif ($result === 0) {
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throw new ParseFailureException(sprintf('Operands "%s" is not in a recognized format', $this->rawTextContent));
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}
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$string = '';
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$font = $this->getFont($document, $page);
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foreach ($matches as $match) {
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if (str_starts_with($match['chars'], '(') && str_ends_with($match['chars'], ')')) {
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$unescapedChars = LiteralStringEscapeCharacter::unescapeCharacters(substr($match['chars'], 1, -1));
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if (preg_match('/^\\\\\d{3}$/', substr($match['chars'], 1, -1)) === 1 && ($glyph = $font->getDifferences()?->getGlyph((int) octdec(substr($match['chars'], 2, -1)))) !== null) {
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$chars = $glyph->getChar();
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} elseif (strlen($unescapedChars) === 1 && ($glyph = $font->getDifferences()?->getGlyph(ord($unescapedChars))) !== null) {
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$chars = $glyph->getChar();
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} elseif (in_array($encoding = $font->getEncoding(), [EncodingNameValue::MacExpertEncoding, EncodingNameValue::WinAnsiEncoding], true)) {
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$chars = $encoding->decodeString($unescapedChars);
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} elseif (($toUnicodeCMap = $font->getToUnicodeCMap() ?? $font->getToUnicodeCMapDescendantFont()) !== null) {
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$chars = $toUnicodeCMap->textToUnicode(bin2hex($unescapedChars));
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} elseif ($encoding !== null) {
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$chars = $encoding->decodeString($unescapedChars);
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} else {
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$chars = $unescapedChars;
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}
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$string .= $chars;
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} elseif (str_starts_with($match['chars'], '<') && str_ends_with($match['chars'], '>')) {
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$chars = substr($match['chars'], 1, -1);
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if (($toUnicodeCMap = $font->getToUnicodeCMap() ?? $font->getToUnicodeCMapDescendantFont()) !== null) {
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$string .= $toUnicodeCMap->textToUnicode($chars);
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} elseif (($encoding = $font->getEncoding()) !== null) {
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$string .= $encoding->decodeString(implode('', array_map(fn (string $character) => mb_chr((int) hexdec($character)), str_split($chars, 2))));
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} else {
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throw new ParseFailureException('Unable to use CMap or decode string to retrieve characters for text object');
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}
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} else {
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throw new ParseFailureException(sprintf('Unrecognized character group format "%s"', $match['chars']));
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}
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if (isset($match['offset']) && (float) $match['offset'] < -100) {
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$string .= ' ';
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}
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}
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return $string;
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}
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/** @return list<int> */
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public function getCodePoints(): array {
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$codePoints = [];
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if (($result = preg_match_all('/(?<chars>(<(\\\\>|[^>])*>)|(\((\\\\\)|[^)])*\)))(?<offset>-?[0-9]+(\.[0-9]+)?)?/', $this->rawTextContent, $matches, PREG_SET_ORDER)) === false) {
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throw new ParseFailureException(sprintf('Error with regex'));
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} elseif ($result === 0) {
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throw new ParseFailureException(sprintf('Operands "%s" is not in a recognized format', $this->rawTextContent));
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}
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foreach ($matches as $match) {
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if (str_starts_with($match['chars'], '(') && str_ends_with($match['chars'], ')')) {
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$chars = str_replace(['\(', '\)', '\n', '\r'], ['(', ')', "\n", "\r"], substr($match['chars'], 1, -1));
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$chars = preg_replace_callback('/\\\\([0-7]{3})/', fn (array $matches) => mb_chr((int) octdec($matches[1])), $chars)
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?? throw new ParseFailureException();
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foreach (str_split($chars) as $char) {
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$codePoints[] = ord($char);
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}
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} elseif (str_starts_with($match['chars'], '<') && str_ends_with($match['chars'], '>')) {
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foreach (str_split(substr($match['chars'], 1, -1), 4) as $char) {
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$codePoints[] = is_int($codePoint = hexdec($char)) ? $codePoint : throw new ParseFailureException();
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}
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} else {
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throw new ParseFailureException(sprintf('Unrecognized character group format "%s"', $match['chars']));
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}
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}
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return $codePoints;
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}
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}
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