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l-systems/tortue.xsl

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<?xml version="1.0" encoding="UTF-8"?>
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<xsl:transform version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:output indent="yes" />
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<xsl:param name="nom" />
<xsl:param name="n" />
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<!-- On récupère le Lsystem qui nous intéresse -->
<xsl:template match="/">
<xsl:processing-instruction name="xml-model">href="tortue.xsd"</xsl:processing-instruction>
<xsl:apply-templates
select="lsystems/lsystem[name=$nom]" />
</xsl:template>
<!-- Appel de la substitution -->
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<xsl:template match="lsystem">
<tortue>
<xsl:call-template name="substitution">
<xsl:with-param name="actuel" select="axiom" />
<xsl:with-param name="n" select="$n" />
</xsl:call-template>
</tortue>
</xsl:template>
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<!-- Substitution -->
<xsl:template name="substitution">
<xsl:param name="actuel" />
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<xsl:param name="n" />
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<!-- Si on doit encore substituer -->
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<xsl:choose>
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<xsl:when test="$n > 0">
<!-- Applique la substitution -->
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<xsl:variable name="data">
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<xsl:call-template name="Application">
<xsl:with-param name="data" select="$actuel" />
</xsl:call-template>
</xsl:variable>
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<!-- Appel récursif -->
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<xsl:call-template
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name="substitution">
<xsl:with-param name="actuel" select="$data" />
<xsl:with-param name="n" select="$n - 1" />
</xsl:call-template>
</xsl:when>
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<xsl:otherwise>
<!-- Interprétation -->
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<xsl:call-template name="Interpretation">
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<xsl:with-param name="data" select="$actuel" />
</xsl:call-template>
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<!-- DEBUG : Chaîne pas interprétée -->
<!-- <xsl:value-of select="$actuel" /> -->
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</xsl:otherwise>
</xsl:choose>
</xsl:template>
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<!-- Applique la substitution -->
<xsl:template name="Application">
<xsl:param name="data" />
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<xsl:variable name="substitution" select="substitutions/substitution" />
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<xsl:analyze-string
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select="$data" regex=".">
<xsl:matching-substring>
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<xsl:variable name="sub" select="$substitution[@member = current()]" />
<xsl:choose>
<!-- Si pas de substitution trouvé, alors on renvoie le caractère
tel qu'il est -->
<xsl:when test="not($sub)">
<xsl:value-of select="current()" />
</xsl:when>
<!-- Sinon renvois sa substitution -->
<xsl:otherwise>
<xsl:value-of select="$sub" />
</xsl:otherwise>
</xsl:choose>
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</xsl:matching-substring>
</xsl:analyze-string>
</xsl:template>
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<!-- Interprète la séquence -->
<xsl:template name="Interpretation">
<xsl:param name="data" />
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<xsl:variable name="interpretation"
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select="interpretations/interpretation" />
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<xsl:analyze-string select="$data" regex=".">
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<xsl:matching-substring>
<xsl:variable name="action"
select="$interpretation[@member = current()]" />
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<xsl:choose>
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<!-- Ecrire -->
<!-- TODO: Si plusieurs <line /> se suivent on pourrait les additionner -->
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<xsl:when test="starts-with($action, 'LINE')">
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<line>
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<xsl:value-of select="substring-after($action, ' ')" />
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</line>
</xsl:when>
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<!-- Déplacer -->
<!-- TODO: Si plusieurs <move /> se suivent on pourrait les additionner -->
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<xsl:when test="starts-with($action, 'MOVE')">
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<move>
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<xsl:value-of select="substring-after($action, ' ')" />
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</move>
</xsl:when>
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<!-- Tourner -->
<!-- TODO: Si plusieurs <turn /> se suivent on pourrait les additionner -->
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<xsl:when test="starts-with($action, 'TURN')">
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<turn>
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<xsl:value-of select="substring-after($action, ' ')" />
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</turn>
</xsl:when>
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<!-- Store -->
<xsl:when test="current() = '['">
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<store />
</xsl:when>
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<!-- Restore -->
<xsl:when test="current() = ']'">
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<restore />
</xsl:when>
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<!-- DEBUG : Affichage des actions non-gérés -->
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<!-- <xsl:otherwise>
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<action>
<xsl:value-of select="$interpretation[@member = current()]" />
</action>
</xsl:otherwise> -->
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</xsl:choose>
</xsl:matching-substring>
</xsl:analyze-string>
</xsl:template>
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</xsl:transform>