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<?php |
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namespace MaxBeckers\AmazonAlexa\Helper; |
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use MaxBeckers\AmazonAlexa\Exception\InvalidSsmlException; |
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/** |
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* @author Maximilian Beckers <[email protected]> |
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*/ |
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class SsmlGenerator implements SsmlTypes |
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{ |
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/** |
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* Enable this flag, when you need escaped special chars in your content (for example escaped "&"). |
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* |
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* @var bool |
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*/ |
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public $escapeSpecialChars = false; |
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/** |
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* @var string[] |
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*/ |
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private $parts = []; |
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/** |
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* Clear the current ssml parts. |
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*/ |
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public function clear() |
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{ |
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$this->parts = []; |
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} |
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/** |
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* @return string |
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*/ |
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public function getSsml() |
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{ |
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return sprintf('<speak>%s</speak>', implode(' ', $this->parts)); |
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} |
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/** |
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* Say a default text. |
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* |
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* @param string $text |
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*/ |
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public function say(string $text) |
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{ |
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$this->parts[] = $this->textEscapeSpecialChars($text); |
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} |
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/** |
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* Play audio in output. |
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* For more specifications of the mp3 file @see https://developer.amazon.com/de/docs/custom-skills/speech-synthesis-markup-language-ssml-reference.html#audio. |
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* |
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* @param string $mp3Url |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function playMp3(string $mp3Url) |
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{ |
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if (1 !== preg_match('/^(https:\/\/.*\.mp3.*)$/i', $mp3Url) && 0 !== strpos($mp3Url, 'soundbank://')) { |
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throw new InvalidSsmlException(sprintf('"%s" in not a valid mp3 url!', $mp3Url)); |
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} |
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$this->parts[] = sprintf('<audio src="%s" />', $mp3Url); |
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} |
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/** |
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* Make a pause (or remove with none/x-weak). |
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* Possible values @see https://developer.amazon.com/de/docs/custom-skills/speech-synthesis-markup-language-ssml-reference.html#break. |
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* |
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* @param string $strength |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function pauseStrength(string $strength) |
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{ |
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if (!in_array($strength, self::BREAK_STRENGTHS, true)) { |
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throw new InvalidSsmlException(sprintf('Break strength must be one of "%s"!', implode(',', self::BREAK_STRENGTHS))); |
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} |
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$this->parts[] = sprintf('<break strength="%s" />', $strength); |
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} |
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/** |
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* Make a pause with duration time as string in seconds(s) or milliseconds(ms). |
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* For example '10s' or '10000ms' to break 10 seconds. |
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* |
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* @param string $time |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function pauseTime(string $time) |
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{ |
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if (1 !== preg_match('/^(\d+(s|ms))$/i', $time)) { |
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throw new InvalidSsmlException('Time must be seconds or milliseconds!'); |
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} |
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$this->parts[] = sprintf('<break time="%s" />', $time); |
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} |
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/** |
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* Say a text with effect. |
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* |
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* @param string $text |
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* @param string $effect |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function sayWithAmazonEffect(string $text, string $effect = self::AMAZON_EFFECT_WHISPERED) |
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{ |
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if (!in_array($effect, self::AMAZON_EFFECTS, true)) { |
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throw new InvalidSsmlException(sprintf('Amazon:effect name must be one of "%s"!', implode(',', self::AMAZON_EFFECTS))); |
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} |
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$this->parts[] = sprintf('<amazon:effect name="%s">%s</amazon:effect>', $effect, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Whisper a text. |
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* |
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* @param string $text |
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*/ |
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public function whisper(string $text) |
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{ |
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$this->sayWithAmazonEffect($text, self::AMAZON_EFFECT_WHISPERED); |
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} |
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/** |
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* Say with emphasis. |
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* |
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* @param string $text |
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* @param string $level |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function emphasis(string $text, string $level) |
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{ |
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if (!in_array($level, self::EMPHASIS_LEVELS, true)) { |
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throw new InvalidSsmlException(sprintf('Emphasis level must be one of "%s"!', implode(',', self::EMPHASIS_LEVELS))); |
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} |
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$this->parts[] = sprintf('<emphasis level="%s">%s</emphasis>', $level, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a text pronounced in the given language. |
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* |
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* @param string $language |
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* @param string $text |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function pronounceInLanguage(string $language, string $text) |
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{ |
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if (!in_array($language, self::LANGUAGE_LIST, true)) { |
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throw new InvalidSsmlException(sprintf('Language must be one of "%s"!', implode(',', self::LANGUAGE_LIST))); |
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} |
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$this->parts[] = sprintf('<lang xml:lang="%s">%s</lang>', $language, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a paragraph. |
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* |
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* @param string $paragraph |
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*/ |
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public function paragraph(string $paragraph) |
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{ |
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$this->parts[] = sprintf('<p>%s</p>', $this->textEscapeSpecialChars($paragraph)); |
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} |
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/** |
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* Say a text with a phoneme. |
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* |
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* @param string $alphabet |
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* @param string $ph |
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* @param string $text |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function phoneme(string $alphabet, string $ph, string $text) |
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{ |
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if (!in_array($alphabet, self::PHONEME_ALPHABETS, true)) { |
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throw new InvalidSsmlException(sprintf('Phoneme alphabet must be one of "%s"!', implode(',', self::PHONEME_ALPHABETS))); |
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} |
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$this->parts[] = sprintf('<phoneme alphabet="%s" ph="%s">%s</phoneme>', $alphabet, $ph, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a text with a prosody. |
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* |
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* There are three different modes of prosody: volume, pitch, and rate. |
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* For more details @see https://developer.amazon.com/de/docs/custom-skills/speech-synthesis-markup-language-ssml-reference.html#prosody |
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* |
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* @param string $mode |
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* @param string $value |
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* @param string $text |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function prosody(string $mode, string $value, string $text) |
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{ |
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if (!isset(self::PROSODIES[$mode])) { |
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throw new InvalidSsmlException(sprintf('Prosody mode must be one of "%s"!', implode(',', array_keys(self::PROSODIES)))); |
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} |
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// todo validate value for mode |
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$this->parts[] = sprintf('<prosody %s="%s">%s</prosody>', $mode, $value, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a sentence. |
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* |
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* @param string $text |
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*/ |
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public function sentence(string $text) |
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{ |
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$this->parts[] = sprintf('<s>%s</s>', $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a text with interpretation. |
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* |
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* @param string $interpretAs |
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* @param string $text |
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* @param string $format |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function sayAs(string $interpretAs, string $text, string $format = '') |
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{ |
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if (!in_array($interpretAs, self::SAY_AS_INTERPRET_AS, true)) { |
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throw new InvalidSsmlException(sprintf('Interpret as attribute must be one of "%s"!', implode(',', self::SAY_AS_INTERPRET_AS))); |
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} |
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if ($format) { |
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$this->parts[] = sprintf('<say-as interpret-as="%s" format="%s">%s</say-as>', $interpretAs, $format, $this->textEscapeSpecialChars($text)); |
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} else { |
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$this->parts[] = sprintf('<say-as interpret-as="%s">%s</say-as>', $interpretAs, $this->textEscapeSpecialChars($text)); |
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} |
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} |
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/** |
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* Say an alias. |
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* For example replace the abbreviated chemical elements with the full words. |
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* |
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* @param string $alias |
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* @param string $text |
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*/ |
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public function alias(string $alias, string $text) |
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{ |
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$this->parts[] = sprintf('<sub alias="%s">%s</sub>', $alias, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a text with the voice of the given person. |
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* |
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* @param string $voice |
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* @param string $text |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function sayWithVoice(string $voice, string $text) |
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{ |
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if (!in_array($voice, self::VOICES, true)) { |
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throw new InvalidSsmlException(sprintf('Voice must be one of "%s"!', implode(',', self::VOICES))); |
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} |
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$this->parts[] = sprintf('<voice name="%s">%s</voice>', $voice, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Say a word with defined word's parts to speach. |
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* |
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* @param string $role |
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* @param string $text |
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* |
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* @throws InvalidSsmlException |
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*/ |
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public function word(string $role, string $text) |
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{ |
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if (!in_array($role, self::INTERPRET_WORDS, true)) { |
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throw new InvalidSsmlException(sprintf('Interpret as attribute must be one of "%s"!', implode(',', self::INTERPRET_WORDS))); |
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} |
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$this->parts[] = sprintf('<w role="%s">%s</w>', $role, $this->textEscapeSpecialChars($text)); |
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} |
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/** |
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* Escape special chars for ssml output (for example "&"). |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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private function textEscapeSpecialChars(string $text): string |
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{ |
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if ($this->escapeSpecialChars) { |
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$text = htmlspecialchars($text); |
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} |
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return $text; |
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} |
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} |
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