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165 lines
6.7 KiB
165 lines
6.7 KiB
<?xml version="1.0" encoding="UTF-8"?>
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<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:output method="text" encoding="ISO-8859-1" indent="no"/>
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<!-- XSLT stylesheet to convert SSML into a format that can be processed by the
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Hadifix txt2pho processor.
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(c) 2004 by Gary Cramblitt
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Original author: Gary Cramblitt <garycramblitt@comcast.net>
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Current Maintainer: Gary Cramblitt <garycramblitt@comcast.net>
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This program is free software; you can redistribute it and/or modify *
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it under the terms of the GNU General Public License as published by *
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the Free Software Foundation; either version 2 of the License, or *
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(at your option) any later version. *
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The txt2pho processor permits special markup to be embedded in text to control
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speech attributes such as speed (duration), pitch, etc.
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The markup must be inside curly braces and separated from other text by a space.
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Spaces within the markup are not permitted.
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See the txt2pho README file for details.
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Something the README does not say is that {Pitch} markup applies only to one
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sentence and reverts back to normal when the sentence is completed.
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It means that we must repeatedly ouput {Pitch} markup
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for each sentence in the text. For example, the SSML
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<prosody pitch="high">Sentence one. Sentence two.</prosody> Sentence three.
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must be converted to
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{Pitch:300} Sentence one. {Pitch:300} Sentence two. Sentence three.
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{Duration} markup, on the other hand, is addative and stays in effect until
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changed. For example, the SSML
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<prosody rate="fast">Sentence one. Sentence two.</prosody> Sentence three.
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must be converted to
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{Duration:-0.5} Sentence one. Sentence two. {Duration:0.5} Sentence three.
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txt2pho will also stop processing when it sees a newline. Therefore, we must take
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care to strip all newlines and avoid inserting any newlines.
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-->
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<!-- Strip all elements and attributes from output. -->
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<xsl:strip-space elements="*" />
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<xsl:template match="speak">
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<xsl:apply-templates/>
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</xsl:template>
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<!-- Handle markup that maintains state. -->
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<xsl:template match="prosody">
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<!-- Rate (speed), Rates are addative and stay in effect until changed. -->
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<!-- TODO: SSML permits nesting of prosody elements. As coded below,
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<prosody rate="slow">One<prosody rate="slow">Two</prosody</prosody>
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will pronounce "Two" doubly slow, which it should not do. -->
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<xsl:choose>
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<xsl:when test="@rate='fast'">
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<!-- Increase speed. -->
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<xsl:value-of select="'{Duration:-0.5} '"/>
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<!-- Continue processing. -->
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<xsl:apply-templates/>
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<!-- Decrease speed. -->
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<xsl:value-of select="'{Duration:0.5} '"/>
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</xsl:when>
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<xsl:when test="@rate='slow'">
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<!-- Decrease speed. -->
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<xsl:value-of select="'{Duration:0.5} '"/>
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<!-- Continue processing. -->
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<xsl:apply-templates/>
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<!-- Increase speed. -->
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<xsl:value-of select="'{Duration:-0.5} '"/>
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</xsl:when>
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<xsl:otherwise>
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<xsl:apply-templates/>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:template>
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<!-- Outputs a sentence with txt2pho markup.
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Called in the context of a text node. Obtain markup by
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extracting ancestor node attributes.
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@param sentence The sentence to mark up.
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@return Sentence preceeded by txt2pho markup.
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-->
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<xsl:template name="output-sentence">
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<xsl:param name="sentence"/>
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<!-- Pitch -->
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<xsl:if test="ancestor::prosody/@pitch='high'">
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<xsl:value-of select="'{Pitch:300} '"/>
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</xsl:if>
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<xsl:if test="ancestor::prosody/@pitch='low'">
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<xsl:value-of select="'{Pitch:-40} '"/>
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</xsl:if>
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<!-- Output the sentence itself. -->
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<xsl:value-of select="$sentence"/>
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</xsl:template>
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<!-- Return the first sentence of argument.
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Sentence delimiters are '.:;!?'
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@param paragraph Paragraph from which to extract first sentence.
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@return The first sentence, or if no such sentence, the paragraph.
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-->
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<xsl:template name="parse-sentence">
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<xsl:param name="paragraph"/>
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<!-- Copy paragraph, replacing all delimeters with period. -->
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<xsl:variable name="tmp">
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<xsl:value-of select="translate($paragraph,':;!?','....')"/>
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</xsl:variable>
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<!-- Look for first period and space and extract corresponding substring from original. -->
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<xsl:choose>
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<xsl:when test="contains($tmp, '. ')">
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<xsl:value-of select="substring($paragraph, 1, string-length(substring-before($tmp, '. '))+2)"/>
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</xsl:when>
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<xsl:otherwise>
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<xsl:value-of select="$paragraph"/>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:template>
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<!-- Process a paragraph, outputting each sentence with txt2pho markup.
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@param paragraph The paragraph to process.
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@return The paragraph with each sentence preceeded by txt2pho markup.
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-->
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<xsl:template name="output-paragraph">
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<xsl:param name="paragraph" />
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<!-- Stop when no more sentences to output. -->
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<xsl:choose>
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<xsl:when test="normalize-space($paragraph)!=''">
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<!-- Split the paragraph into first sentence and rest of paragraph (if any). -->
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<xsl:variable name="sentence">
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<xsl:call-template name="parse-sentence">
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<xsl:with-param name="paragraph" select="$paragraph"/>
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</xsl:call-template>
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</xsl:variable>
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<!-- debug: <xsl:value-of select="concat('[sentence: ',$sentence,']')"/> -->
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<xsl:variable name="rest">
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<xsl:value-of select="substring-after($paragraph,$sentence)" />
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</xsl:variable>
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<!-- Output the sentence with markup. -->
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<xsl:call-template name="output-sentence" >
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<xsl:with-param name="sentence" select="$sentence" />
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</xsl:call-template>
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<!-- Recursively process the rest of the paragraph. -->
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<xsl:call-template name="output-paragraph">
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<xsl:with-param name="paragraph" select="$rest" />
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</xsl:call-template>
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</xsl:when>
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</xsl:choose>
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</xsl:template>
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<!-- Process each text node. -->
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<xsl:template match="text()">
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<!-- debug: <xsl:value-of select="concat('[paragraph: ',normalize-space(.),']')"/> -->
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<xsl:call-template name="output-paragraph">
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<xsl:with-param name="paragraph" select="concat(normalize-space(.),' ')"/>
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</xsl:call-template>
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</xsl:template>
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</xsl:stylesheet>
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