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<?xml version="1.0" encoding="UTF-8"?>
<!--
xml2dot.xsl - transform Bison XML Report into DOT.
Copyright (C) 2007-2015 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written by Wojciech Polak <polak@gnu.org>.
-->
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:bison="http://www.gnu.org/software/bison/">
<xsl:import href="bison.xsl"/>
<xsl:output method="text" encoding="UTF-8" indent="no"/>
<xsl:template match="/">
<xsl:apply-templates select="bison-xml-report"/>
</xsl:template>
<xsl:template match="bison-xml-report">
<xsl:text>// Generated by GNU Bison </xsl:text>
<xsl:value-of select="@version"/>
<xsl:text>. </xsl:text>
<xsl:text>// Report bugs to <</xsl:text>
<xsl:value-of select="@bug-report"/>
<xsl:text>>. </xsl:text>
<xsl:text>// Home page: <</xsl:text>
<xsl:value-of select="@url"/>
<xsl:text>>. </xsl:text>
<xsl:apply-templates select="automaton">
<xsl:with-param name="filename" select="filename"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="automaton">
<xsl:param name="filename"/>
<xsl:text>digraph "</xsl:text>
<xsl:call-template name="escape">
<xsl:with-param name="subject" select="$filename"/>
</xsl:call-template>
<xsl:text>" {
node [fontname = courier, shape = box, colorscheme = paired6]
edge [fontname = courier]
</xsl:text>
<xsl:apply-templates select="state"/>
<xsl:text>} </xsl:text>
</xsl:template>
<xsl:template match="automaton/state">
<xsl:call-template name="output-node">
<xsl:with-param name="number" select="@number"/>
<xsl:with-param name="label">
<xsl:apply-templates select="itemset/item"/>
</xsl:with-param>
</xsl:call-template>
<xsl:apply-templates select="actions/transitions"/>
<xsl:apply-templates select="actions/reductions">
<xsl:with-param name="staten">
<xsl:value-of select="@number"/>
</xsl:with-param>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="actions/reductions">
<xsl:param name="staten"/>
<xsl:for-each select='reduction'>
<!-- These variables are needed because the current context can't be
refered to directly in XPath expressions. -->
<xsl:variable name="rul">
<xsl:value-of select="@rule"/>
</xsl:variable>
<xsl:variable name="ena">
<xsl:value-of select="@enabled"/>
</xsl:variable>
<!-- The foreach's body is protected by this, so that we are actually
going to iterate once per reduction rule, and not per lookahead. -->
<xsl:if test='not(preceding-sibling::*[@rule=$rul and @enabled=$ena])'>
<xsl:variable name="rule">
<xsl:choose>
<!-- The acceptation state is refered to as 'accept' in the XML, but
just as '0' in the DOT. -->
<xsl:when test="@rule='accept'">
<xsl:text>0</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="@rule"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<!-- The edge's beginning -->
<xsl:call-template name="reduction-edge-start">
<xsl:with-param name="state" select="$staten"/>
<xsl:with-param name="rule" select="$rule"/>
<xsl:with-param name="enabled" select="@enabled"/>
</xsl:call-template>
<!-- The edge's tokens -->
<!-- Don't show labels for the default action. In other cases, there will
always be at least one token, so 'label="[]"' will not occur. -->
<xsl:if test='$rule!=0 and not(../reduction[@enabled=$ena and @rule=$rule and @symbol="$default"])'>
<xsl:text>label="[</xsl:text>
<xsl:for-each select='../reduction[@enabled=$ena and @rule=$rule]'>
<xsl:call-template name="escape">
<xsl:with-param name="subject" select="@symbol"/>
</xsl:call-template>
<xsl:if test="position() != last ()">
<xsl:text>, </xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text>]", </xsl:text>
</xsl:if>
<!-- The edge's end -->
<xsl:text>style=solid] </xsl:text>
<!-- The diamond representing the reduction -->
<xsl:call-template name="reduction-node">
<xsl:with-param name="state" select="$staten"/>
<xsl:with-param name="rule" select="$rule"/>
<xsl:with-param name="color">
<xsl:choose>
<xsl:when test='@enabled="true"'>
<xsl:text>3</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>5</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:with-param>
</xsl:call-template>
</xsl:if>
</xsl:for-each>
</xsl:template>
<xsl:template match="actions/transitions">
<xsl:apply-templates select="transition"/>
</xsl:template>
<xsl:template match="item">
<xsl:param name="prev-rule-number"
select="preceding-sibling::item[1]/@rule-number"/>
<xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
<xsl:with-param name="point" select="@point"/>
<xsl:with-param name="num" select="@rule-number"/>
<xsl:with-param name="prev-lhs"
select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
/>
</xsl:apply-templates>
<xsl:apply-templates select="lookaheads"/>
</xsl:template>
<xsl:template match="rule">
<xsl:param name="point"/>
<xsl:param name="num"/>
<xsl:param name="prev-lhs"/>
<xsl:text> </xsl:text>
<xsl:choose>
<xsl:when test="$num < 10">
<xsl:text> </xsl:text>
</xsl:when>
<xsl:when test="$num < 100">
<xsl:text> </xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text></xsl:text>
</xsl:otherwise>
</xsl:choose>
<xsl:value-of select="$num"/>
<xsl:text> </xsl:text>
<xsl:choose>
<xsl:when test="$prev-lhs = lhs[text()]">
<xsl:call-template name="lpad">
<xsl:with-param name="str" select="'|'"/>
<xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="lhs"/>
<xsl:text>:</xsl:text>
</xsl:otherwise>
</xsl:choose>
<xsl:if test="$point = 0">
<xsl:text> .</xsl:text>
</xsl:if>
<!-- RHS -->
<xsl:for-each select="rhs/symbol|rhs/empty">
<xsl:apply-templates select="."/>
<xsl:if test="$point = position()">
<xsl:text> .</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:template>
<xsl:template match="symbol">
<xsl:text> </xsl:text>
<xsl:value-of select="."/>
</xsl:template>
<xsl:template match="empty">
<xsl:text> %empty</xsl:text>
</xsl:template>
<xsl:template match="lookaheads">
<xsl:text> [</xsl:text>
<xsl:apply-templates select="symbol"/>
<xsl:text>]</xsl:text>
</xsl:template>
<xsl:template match="lookaheads/symbol">
<xsl:value-of select="."/>
<xsl:if test="position() != last()">
<xsl:text>, </xsl:text>
</xsl:if>
</xsl:template>
<xsl:template name="reduction-edge-start">
<xsl:param name="state"/>
<xsl:param name="rule"/>
<xsl:param name="enabled"/>
<xsl:text> </xsl:text>
<xsl:value-of select="$state"/>
<xsl:text> -> "</xsl:text>
<xsl:value-of select="$state"/>
<xsl:text>R</xsl:text>
<xsl:value-of select="$rule"/>
<xsl:if test='$enabled = "false"'>
<xsl:text>d</xsl:text>
</xsl:if>
<xsl:text>" [</xsl:text>
</xsl:template>
<xsl:template name="reduction-node">
<xsl:param name="state"/>
<xsl:param name="rule"/>
<xsl:param name="color"/>
<xsl:text> "</xsl:text>
<xsl:value-of select="$state"/>
<xsl:text>R</xsl:text>
<xsl:value-of select="$rule"/>
<xsl:if test="$color = 5">
<xsl:text>d</xsl:text>
</xsl:if>
<xsl:text>" [label="</xsl:text>
<xsl:choose>
<xsl:when test="$rule = 0">
<xsl:text>Acc", fillcolor=1</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>R</xsl:text>
<xsl:value-of select="$rule"/>
<xsl:text>", fillcolor=</xsl:text>
<xsl:value-of select="$color"/>
</xsl:otherwise>
</xsl:choose>
<xsl:text>, shape=diamond, style=filled] </xsl:text>
</xsl:template>
<xsl:template match="transition">
<xsl:call-template name="output-edge">
<xsl:with-param name="src" select="../../../@number"/>
<xsl:with-param name="dst" select="@state"/>
<xsl:with-param name="style">
<xsl:choose>
<xsl:when test="@symbol = 'error'">
<xsl:text>dotted</xsl:text>
</xsl:when>
<xsl:when test="@type = 'shift'">
<xsl:text>solid</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>dashed</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:with-param>
<xsl:with-param name="label">
<xsl:if test="not(@symbol = 'error')">
<xsl:value-of select="@symbol"/>
</xsl:if>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="output-node">
<xsl:param name="number"/>
<xsl:param name="label"/>
<xsl:text> </xsl:text>
<xsl:value-of select="$number"/>
<xsl:text> [label="</xsl:text>
<xsl:text>State </xsl:text>
<xsl:value-of select="$number"/>
<xsl:text>\n</xsl:text>
<xsl:call-template name="escape">
<xsl:with-param name="subject" select="$label"/>
</xsl:call-template>
<xsl:text>\l"] </xsl:text>
</xsl:template>
<xsl:template name="output-edge">
<xsl:param name="src"/>
<xsl:param name="dst"/>
<xsl:param name="style"/>
<xsl:param name="label"/>
<xsl:text> </xsl:text>
<xsl:value-of select="$src"/>
<xsl:text> -> </xsl:text>
<xsl:value-of select="$dst"/>
<xsl:text> [style=</xsl:text>
<xsl:value-of select="$style"/>
<xsl:if test="$label and $label != ''">
<xsl:text> label="</xsl:text>
<xsl:call-template name="escape">
<xsl:with-param name="subject" select="$label"/>
</xsl:call-template>
<xsl:text>"</xsl:text>
</xsl:if>
<xsl:text>] </xsl:text>
</xsl:template>
<xsl:template name="escape">
<xsl:param name="subject"/> <!-- required -->
<xsl:call-template name="string-replace">
<xsl:with-param name="subject">
<xsl:call-template name="string-replace">
<xsl:with-param name="subject">
<xsl:call-template name="string-replace">
<xsl:with-param name="subject" select="$subject"/>
<xsl:with-param name="search" select="'\'"/>
<xsl:with-param name="replace" select="'\\'"/>
</xsl:call-template>
</xsl:with-param>
<xsl:with-param name="search" select="'"'"/>
<xsl:with-param name="replace" select="'\"'"/>
</xsl:call-template>
</xsl:with-param>
<xsl:with-param name="search" select="' '"/>
<xsl:with-param name="replace" select="'\l'"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="string-replace">
<xsl:param name="subject"/>
<xsl:param name="search"/>
<xsl:param name="replace"/>
<xsl:choose>
<xsl:when test="contains($subject, $search)">
<xsl:variable name="before" select="substring-before($subject, $search)"/>
<xsl:variable name="after" select="substring-after($subject, $search)"/>
<xsl:value-of select="$before"/>
<xsl:value-of select="$replace"/>
<xsl:call-template name="string-replace">
<xsl:with-param name="subject" select="$after"/>
<xsl:with-param name="search" select="$search"/>
<xsl:with-param name="replace" select="$replace"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$subject"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="lpad">
<xsl:param name="str" select="''"/>
<xsl:param name="pad" select="0"/>
<xsl:variable name="diff" select="$pad - string-length($str)" />
<xsl:choose>
<xsl:when test="$diff < 0">
<xsl:value-of select="$str"/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="space">
<xsl:with-param name="repeat" select="$diff"/>
</xsl:call-template>
<xsl:value-of select="$str"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>