1<?xml version="1.0" encoding="UTF-8"?>
2
3<!--
4    xml2dot.xsl - transform Bison XML Report into DOT.
5
6    Copyright (C) 2007-2012 Free Software Foundation, Inc.
7
8    This file is part of Bison, the GNU Compiler Compiler.
9
10    This program is free software: you can redistribute it and/or modify
11    it under the terms of the GNU General Public License as published by
12    the Free Software Foundation, either version 3 of the License, or
13    (at your option) any later version.
14
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License for more details.
19
20    You should have received a copy of the GNU General Public License
21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
22
23    Written by Wojciech Polak <polak@gnu.org>.
24  -->
25
26<xsl:stylesheet version="1.0"
27  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
28  xmlns:bison="http://www.gnu.org/software/bison/">
29
30<xsl:import href="bison.xsl"/>
31<xsl:output method="text" encoding="UTF-8" indent="no"/>
32
33<xsl:template match="/">
34  <xsl:apply-templates select="bison-xml-report"/>
35</xsl:template>
36
37<xsl:template match="bison-xml-report">
38  <xsl:text>// Generated by GNU Bison </xsl:text>
39  <xsl:value-of select="@version"/>
40  <xsl:text>.&#10;</xsl:text>
41  <xsl:text>// Report bugs to &lt;</xsl:text>
42  <xsl:value-of select="@bug-report"/>
43  <xsl:text>&gt;.&#10;</xsl:text>
44  <xsl:text>// Home page: &lt;</xsl:text>
45  <xsl:value-of select="@url"/>
46  <xsl:text>&gt;.&#10;&#10;</xsl:text>
47  <xsl:apply-templates select="automaton">
48    <xsl:with-param name="filename" select="filename"/>
49  </xsl:apply-templates>
50</xsl:template>
51
52<xsl:template match="automaton">
53  <xsl:param name="filename"/>
54  <xsl:text>digraph "</xsl:text>
55  <xsl:call-template name="escape">
56    <xsl:with-param name="subject" select="$filename"/>
57  </xsl:call-template>
58  <xsl:text>"&#10;{
59  node [fontname = courier, shape = box, colorscheme = paired6]
60  edge [fontname = courier]
61
62</xsl:text>
63  <xsl:apply-templates select="state"/>
64  <xsl:text>}&#10;</xsl:text>
65</xsl:template>
66
67<xsl:template match="automaton/state">
68  <xsl:call-template name="output-node">
69    <xsl:with-param name="number" select="@number"/>
70    <xsl:with-param name="label">
71      <xsl:apply-templates select="itemset/item"/>
72    </xsl:with-param>
73  </xsl:call-template>
74  <xsl:apply-templates select="actions/transitions"/>
75  <xsl:apply-templates select="actions/reductions">
76    <xsl:with-param name="staten">
77      <xsl:value-of select="@number"/>
78    </xsl:with-param>
79  </xsl:apply-templates>
80</xsl:template>
81
82<xsl:template match="actions/reductions">
83  <xsl:param name="staten"/>
84  <xsl:for-each select='reduction'>
85    <!-- These variables are needed because the current context can't be
86         refered to directly in XPath expressions. -->
87    <xsl:variable name="rul">
88      <xsl:value-of select="@rule"/>
89    </xsl:variable>
90    <xsl:variable name="ena">
91      <xsl:value-of select="@enabled"/>
92    </xsl:variable>
93    <!-- The foreach's body is protected by this, so that we are actually
94         going to iterate once per reduction rule, and not per lookahead. -->
95    <xsl:if test='not(preceding-sibling::*[@rule=$rul and @enabled=$ena])'>
96      <xsl:variable name="rule">
97        <xsl:choose>
98          <!-- The acceptation state is refered to as 'accept' in the XML, but
99               just as '0' in the DOT. -->
100          <xsl:when test="@rule='accept'">
101            <xsl:text>0</xsl:text>
102          </xsl:when>
103          <xsl:otherwise>
104            <xsl:value-of select="@rule"/>
105          </xsl:otherwise>
106        </xsl:choose>
107      </xsl:variable>
108
109      <!-- The edge's beginning -->
110      <xsl:call-template name="reduction-edge-start">
111        <xsl:with-param name="state" select="$staten"/>
112        <xsl:with-param name="rule" select="$rule"/>
113        <xsl:with-param name="enabled" select="@enabled"/>
114      </xsl:call-template>
115
116      <!-- The edge's tokens -->
117      <!-- Don't show labels for the default action. In other cases, there will
118           always be at least one token, so 'label="[]"' will not occur. -->
119      <xsl:if test='$rule!=0 and not(../reduction[@enabled=$ena and @rule=$rule and @symbol="$default"])'>
120        <xsl:text>label="[</xsl:text>
121        <xsl:for-each select='../reduction[@enabled=$ena and @rule=$rule]'>
122          <xsl:call-template name="escape">
123            <xsl:with-param name="subject" select="@symbol"/>
124          </xsl:call-template>
125          <xsl:if test="position() != last ()">
126            <xsl:text>, </xsl:text>
127          </xsl:if>
128        </xsl:for-each>
129        <xsl:text>]", </xsl:text>
130      </xsl:if>
131
132      <!-- The edge's end -->
133      <xsl:text>style=solid]&#10;</xsl:text>
134
135      <!-- The diamond representing the reduction -->
136      <xsl:call-template name="reduction-node">
137        <xsl:with-param name="state" select="$staten"/>
138        <xsl:with-param name="rule" select="$rule"/>
139        <xsl:with-param name="color">
140          <xsl:choose>
141            <xsl:when test='@enabled="true"'>
142              <xsl:text>3</xsl:text>
143            </xsl:when>
144            <xsl:otherwise>
145              <xsl:text>5</xsl:text>
146            </xsl:otherwise>
147          </xsl:choose>
148        </xsl:with-param>
149      </xsl:call-template>
150    </xsl:if>
151  </xsl:for-each>
152</xsl:template>
153
154<xsl:template match="actions/transitions">
155  <xsl:apply-templates select="transition"/>
156</xsl:template>
157
158<xsl:template match="item">
159  <xsl:param name="prev-rule-number"
160    select="preceding-sibling::item[1]/@rule-number"/>
161  <xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
162    <xsl:with-param name="point" select="@point"/>
163    <xsl:with-param name="num" select="@rule-number"/>
164    <xsl:with-param name="prev-lhs"
165      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
166   />
167  </xsl:apply-templates>
168  <xsl:apply-templates select="lookaheads"/>
169</xsl:template>
170
171<xsl:template match="rule">
172  <xsl:param name="point"/>
173  <xsl:param name="num"/>
174  <xsl:param name="prev-lhs"/>
175  <xsl:text>&#10;</xsl:text>
176  <xsl:choose>
177    <xsl:when test="$num &lt; 10">
178      <xsl:text>  </xsl:text>
179    </xsl:when>
180    <xsl:when test="$num &lt; 100">
181      <xsl:text> </xsl:text>
182    </xsl:when>
183    <xsl:otherwise>
184      <xsl:text></xsl:text>
185    </xsl:otherwise>
186  </xsl:choose>
187  <xsl:value-of select="$num"/>
188  <xsl:text> </xsl:text>
189  <xsl:choose>
190  <xsl:when test="$prev-lhs = lhs[text()]">
191      <xsl:call-template name="lpad">
192        <xsl:with-param name="str" select="'|'"/>
193        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
194      </xsl:call-template>
195    </xsl:when>
196    <xsl:otherwise>
197      <xsl:value-of select="lhs"/>
198      <xsl:text>:</xsl:text>
199    </xsl:otherwise>
200  </xsl:choose>
201  <xsl:if test="$point = 0">
202    <xsl:text> .</xsl:text>
203  </xsl:if>
204  <xsl:for-each select="rhs/symbol|rhs/empty">
205    <xsl:apply-templates select="."/>
206    <xsl:if test="$point = position()">
207      <xsl:text> .</xsl:text>
208    </xsl:if>
209  </xsl:for-each>
210</xsl:template>
211
212<xsl:template match="symbol">
213  <xsl:text> </xsl:text>
214  <xsl:value-of select="."/>
215</xsl:template>
216
217<xsl:template match="empty"/>
218
219<xsl:template match="lookaheads">
220  <xsl:text>  [</xsl:text>
221  <xsl:apply-templates select="symbol"/>
222  <xsl:text>]</xsl:text>
223</xsl:template>
224
225<xsl:template match="lookaheads/symbol">
226  <xsl:value-of select="."/>
227  <xsl:if test="position() != last()">
228    <xsl:text>, </xsl:text>
229  </xsl:if>
230</xsl:template>
231
232<xsl:template name="reduction-edge-start">
233  <xsl:param name="state"/>
234  <xsl:param name="rule"/>
235  <xsl:param name="enabled"/>
236
237  <xsl:text>  </xsl:text>
238  <xsl:value-of select="$state"/>
239  <xsl:text> -> "</xsl:text>
240  <xsl:value-of select="$state"/>
241  <xsl:text>R</xsl:text>
242  <xsl:value-of select="$rule"/>
243  <xsl:if test='$enabled = "false"'>
244    <xsl:text>d</xsl:text>
245  </xsl:if>
246  <xsl:text>" [</xsl:text>
247</xsl:template>
248
249<xsl:template name="reduction-node">
250  <xsl:param name="state"/>
251  <xsl:param name="rule"/>
252  <xsl:param name="color"/>
253
254  <xsl:text> "</xsl:text>
255  <xsl:value-of select="$state"/>
256  <xsl:text>R</xsl:text>
257  <xsl:value-of select="$rule"/>
258  <xsl:if test="$color = 5">
259    <xsl:text>d</xsl:text>
260  </xsl:if>
261  <xsl:text>" [label="</xsl:text>
262  <xsl:choose>
263  <xsl:when test="$rule = 0">
264    <xsl:text>Acc", fillcolor=1</xsl:text>
265  </xsl:when>
266  <xsl:otherwise>
267    <xsl:text>R</xsl:text>
268    <xsl:value-of select="$rule"/>
269    <xsl:text>", fillcolor=</xsl:text>
270    <xsl:value-of select="$color"/>
271  </xsl:otherwise>
272  </xsl:choose>
273  <xsl:text>, shape=diamond, style=filled]&#10;</xsl:text>
274</xsl:template>
275
276<xsl:template match="transition">
277  <xsl:call-template name="output-edge">
278    <xsl:with-param name="src" select="../../../@number"/>
279    <xsl:with-param name="dst" select="@state"/>
280    <xsl:with-param name="style">
281      <xsl:choose>
282	<xsl:when test="@symbol = 'error'">
283	  <xsl:text>dotted</xsl:text>
284	</xsl:when>
285	<xsl:when test="@type = 'shift'">
286	  <xsl:text>solid</xsl:text>
287	</xsl:when>
288	<xsl:otherwise>
289	  <xsl:text>dashed</xsl:text>
290	</xsl:otherwise>
291      </xsl:choose>
292    </xsl:with-param>
293    <xsl:with-param name="label">
294      <xsl:if test="not(@symbol = 'error')">
295	<xsl:value-of select="@symbol"/>
296      </xsl:if>
297    </xsl:with-param>
298  </xsl:call-template>
299</xsl:template>
300
301<xsl:template name="output-node">
302  <xsl:param name="number"/>
303  <xsl:param name="label"/>
304  <xsl:text>  </xsl:text>
305  <xsl:value-of select="$number"/>
306  <xsl:text> [label="</xsl:text>
307  <xsl:text>State </xsl:text>
308  <xsl:value-of select="$number"/>
309  <xsl:text>\n</xsl:text>
310  <xsl:call-template name="escape">
311    <xsl:with-param name="subject" select="$label"/>
312  </xsl:call-template>
313  <xsl:text>\l"]&#10;</xsl:text>
314</xsl:template>
315
316<xsl:template name="output-edge">
317  <xsl:param name="src"/>
318  <xsl:param name="dst"/>
319  <xsl:param name="style"/>
320  <xsl:param name="label"/>
321  <xsl:text>  </xsl:text>
322  <xsl:value-of select="$src"/>
323  <xsl:text> -> </xsl:text>
324  <xsl:value-of select="$dst"/>
325  <xsl:text> [style=</xsl:text>
326  <xsl:value-of select="$style"/>
327  <xsl:if test="$label and $label != ''">
328    <xsl:text> label="</xsl:text>
329    <xsl:call-template name="escape">
330      <xsl:with-param name="subject" select="$label"/>
331    </xsl:call-template>
332    <xsl:text>"</xsl:text>
333  </xsl:if>
334  <xsl:text>]&#10;</xsl:text>
335</xsl:template>
336
337<xsl:template name="escape">
338  <xsl:param name="subject"/> <!-- required -->
339  <xsl:call-template name="string-replace">
340    <xsl:with-param name="subject">
341      <xsl:call-template name="string-replace">
342        <xsl:with-param name="subject">
343          <xsl:call-template name="string-replace">
344            <xsl:with-param name="subject" select="$subject"/>
345            <xsl:with-param name="search" select="'\'"/>
346            <xsl:with-param name="replace" select="'\\'"/>
347          </xsl:call-template>
348        </xsl:with-param>
349        <xsl:with-param name="search" select="'&quot;'"/>
350        <xsl:with-param name="replace" select="'\&quot;'"/>
351      </xsl:call-template>
352    </xsl:with-param>
353    <xsl:with-param name="search" select="'&#10;'"/>
354    <xsl:with-param name="replace" select="'\l'"/>
355  </xsl:call-template>
356</xsl:template>
357
358<xsl:template name="string-replace">
359  <xsl:param name="subject"/>
360  <xsl:param name="search"/>
361  <xsl:param name="replace"/>
362  <xsl:choose>
363    <xsl:when test="contains($subject, $search)">
364      <xsl:variable name="before" select="substring-before($subject, $search)"/>
365      <xsl:variable name="after" select="substring-after($subject, $search)"/>
366      <xsl:value-of select="$before"/>
367      <xsl:value-of select="$replace"/>
368      <xsl:call-template name="string-replace">
369        <xsl:with-param name="subject" select="$after"/>
370        <xsl:with-param name="search" select="$search"/>
371        <xsl:with-param name="replace" select="$replace"/>
372      </xsl:call-template>
373    </xsl:when>
374    <xsl:otherwise>
375      <xsl:value-of select="$subject"/>
376    </xsl:otherwise>
377  </xsl:choose>
378</xsl:template>
379
380<xsl:template name="lpad">
381  <xsl:param name="str" select="''"/>
382  <xsl:param name="pad" select="0"/>
383  <xsl:variable name="diff" select="$pad - string-length($str)" />
384  <xsl:choose>
385    <xsl:when test="$diff &lt; 0">
386      <xsl:value-of select="$str"/>
387    </xsl:when>
388    <xsl:otherwise>
389      <xsl:call-template name="space">
390        <xsl:with-param name="repeat" select="$diff"/>
391      </xsl:call-template>
392      <xsl:value-of select="$str"/>
393    </xsl:otherwise>
394  </xsl:choose>
395</xsl:template>
396
397</xsl:stylesheet>
398