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# -*- mode: org; -*-
#+AUTHOR: Lucien Cartier-Tilet
#+EMAIL: phundrak@phundrak.fr
#+CREATOR: Lucien Cartier-Tilet
#+LANGUAGE: fr
# ### LaTeX ####################################################################
#+LATEX_CLASS: article
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#+LaTeX_CLASS_OPTIONS: [a5paper,twoside]
#+LATEX_HEADER: \usepackage{xltxtra,fontspec,xunicode}
#+LATEX_HEADER: \usepackage[total={11cm,17cm}]{geometry}
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#+LATEX_HEADER: \setromanfont{Charis SIL}
#+LATEX_HEADER: \usepackage{xcolor}
#+LATEX_HEADER: \usepackage{hyperref}
#+LATEX_HEADER: \hypersetup{colorlinks=true,linkbordercolor=red,linkcolor=blue,pdfborderstyle={/S/U/W 1}}
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#+LATEX_HEADER: \usepackage{multicol}
#+LATEX_HEADER: \usepackage{indentfirst}
#+LATEX_HEADER: \sloppy
# ### HTML #####################################################################
#+HTML_DOCTYPE: html5
#+HTML_HEAD: <link rel="shortcut icon" href="https://cdn.phundrak.fr/img/mahakala-128x128.png" type="img/png" media="screen" />
#+HTML_HEAD: <link rel="shortcut icon" href="https://cdn.phundrak.fr/img/favicon.ico" type="image/x-icon" media="screen" />
#+HTML_HEAD: <meta property="og:image" content="https://cdn.phundrak.fr/img/rich_preview.png" />
#+HTML_HEAD: <meta name="twitter:card" content="summary" />
#+HTML_HEAD: <meta name="twitter:site" content="@phundrak" />
#+HTML_HEAD: <meta name="twitter:creator" content="@phundrak" />
# ### CODE #####################################################################
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#+NAME: tree-dot
#+BEGIN_SRC emacs-lisp :noweb yes :exports none :eval yes :cache yes
(defun declare-node (node-text node-generation)
"Declares a node in the graphviz source code. The nodes identifier will be
~node-generation~, and it will bear the label ~node-text~."
(concat (number-to-string node-generation)
"[label=\""
node-text
"\"];"))
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(defun make-link (previous-node current-node)
"This creates a link in the graphviz source code between the two nodes
bearing ~previous-node~ and ~current-node~ respectively as their node
identifier."
(concat (number-to-string previous-node) " -- "
(number-to-string current-node) ";"))
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(defun tree-to-dot-helper (tree current-generation previous-generation)
"Helper to ~tree-to-dot~ that translates an Elisp tree with any number of
children per node to a corresponding graphviz file that can be executed from
dot.
Arguments:
- tree :: tree-to-convert
- current-generation :: Generation number, incremented when changing from a node
to another node from the same generation, multiplied by 10 when going from
a node to one of its children.
- previous-generation :: generation number from previous named node"
(cond
((null tree) "")
((atom (car tree)) ;; '("text" () () ())
(concat (declare-node (car tree) current-generation)
(make-link previous-generation current-generation)
(tree-to-dot-helper (cdr tree)
(+ 1 (* 10 current-generation))
current-generation)))
((listp (car tree)) ;; '(() () ())
(concat (tree-to-dot-helper (car tree) ;; child of current node
current-generation
previous-generation)
(tree-to-dot-helper (cdr tree)
(+ 1 current-generation)
previous-generation)))))
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(defun tree-to-dot (tree)
"Returns a graphvizs dot compatible string representing an Elisp tree"
(if (null tree) ""
(concat
"graph{node[shape=plaintext];graph[bgcolor=\"transparent\"];"
(declare-node (car tree) 0)
(tree-to-dot-helper (cdr tree) 1 0)
"}")))
#+END_SRC
# ### MACROS ###################################################################
#+MACRO: newline @@latex:\hspace{0pt}\\@@ @@html:<br>@@
#+MACRO: newpage @@latex:\newpage@@
#+MACRO: latex-html @@latex:$1@@ @@html:$2@@
#+MACRO: phon @@latex:/$1/@@ @@html:&frasl;$1&frasl;@@
#+MACRO: v @@latex:\rotatebox[origin=c]{270}{$1}@@ @@html:<span class=vertical>$1</span>@@
#+MACRO: begin-largetable @@html:<div class="largetable">@@
#+MACRO: end-largetable @@html:</div>@@
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#+OPTIONS: H:4 broken_links:mark email:t ^:{}