Dokumentation ergänzt

.gitignore

@@ -38,3 +38,7 @@ DHParser/stringview.c
 imperium.html
 fascitergula.html
 _build
+examples/Tutorial/LyrikCompiler.py
+_build
+_static
+_templates

DHParser/dsl.py

@@ -23,6 +23,8 @@ compilation of domain specific languages based on an EBNF-grammar.
 
 
 import os
+import platform
+import stat
 
 from DHParser.compile import Compiler, compile_source
 from DHParser.ebnf import EBNFCompiler, grammar_changed, \
@@ -70,10 +72,16 @@ COMPILER_SECTION = "COMPILER SECTION - Can be edited. Changes will be preserved.
 END_SECTIONS_MARKER = "END OF DHPARSER-SECTIONS"
 
 
+dhparserdir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+
+
 DHPARSER_IMPORTS = '''
 from functools import partial
 import os
 import sys
+
+sys.path.append('{dhparserdir}')
+
 try:
     import regex as re
 except ImportError:
@@ -92,7 +100,7 @@ from DHParser import logging, is_filename, load_if_file, \\
     remove_nodes, remove_content, remove_brackets, replace_parser, \\
     keep_children, is_one_of, has_content, apply_if, remove_first, remove_last, \\
     remove_anonymous_empty, keep_nodes, traverse_locally, strip
-'''
+'''.format(dhparserdir=dhparserdir)
 
 
 DHPARSER_MAIN = '''
@@ -480,8 +488,9 @@ def compile_on_disk(source_file: str, compiler_suite="", extension=".xml") -> It
         if RX_WHITESPACE.fullmatch(compiler):
             compiler = ebnf_compiler.gen_compiler_skeleton()
 
+        compilerscript = rootname + 'Compiler.py'
         try:
-            f = open(rootname + 'Compiler.py', 'w', encoding="utf-8")
+            f = open(compilerscript, 'w', encoding="utf-8")
             f.write(intro)
             f.write(SECTION_MARKER.format(marker=SYMBOLS_SECTION))
             f.write(imports)
@@ -496,13 +505,18 @@ def compile_on_disk(source_file: str, compiler_suite="", extension=".xml") -> It
             f.write(SECTION_MARKER.format(marker=END_SECTIONS_MARKER))
             f.write(outro)
         except (PermissionError, FileNotFoundError, IOError) as error:
-            print('# Could not write file "' + rootname + 'Compiler.py" because of: '
+            print('# Could not write file "' + compilerscript + '" because of: '
                   + "\n# ".join(str(error).split('\n)')))
             print(result)
         finally:
             if f:
                 f.close()
 
+        if platform.system() != "Windows":
+            # set file permissions so that the compilerscript can be executed
+            st = os.stat(compilerscript)
+            os.chmod(compilerscript, st.st_mode | stat.S_IEXEC)
+
     else:
         f = None
         try:

DevScripts/Readme-DevScripts.md

@@ -2,7 +2,7 @@ Folder "DevScripts"
 ===================
 
 This folder contains helper scripts for the development of DHParser.
-**These scripts are experimental and my be out of date!**
+**These scripts are experimental and horribly outdated!**
 
 * collect_symbols.py - Lists all exported symbols from DHParser modules
 

experimental/test_stringview_performance.py → DevScripts/test_stringview_performance.py

 #!/usr/bin/python
 
+import sys
+
+sys.path.append('../')
+
 from DHParser.stringview import StringView
 from timeit import timeit
 import re

Introduction.md

 Introduction to [DHParser](https://gitlab.lrz.de/badw-it/DHParser)
 ==================================================================
 
-*This is just an appetizer. Full documentation coming soon...*
-
 Motto: **Computers enjoy XML, humans don't.**
 
 Why use domain specific languages in the humanities
@@ -160,19 +158,19 @@ The output will be something like this:
 
 Now, you might notice that this is not exactly the XML-encoding as shown
 above. (Can you spot the differences?) But you will probably believe me
-without further proof that it can easily be converted into the other
-version and contains all the information that the other version contains.
+without further proof that it can easily be converted into the other version
+and contains all the information that the other version contains.
 
 How does DHParser achieve this? Well, there is the rub. In order to convert
 the poem in the domain specific version into the XML-version, DHParser
-requires a structural description of the domain specific encoding. This
-is a bit similar to a document type definition (DTD) in XML. This
-structural description uses a slightly enhanced version of the
-[Extended-Backus-Naur-Form (EBNF)](https://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_form),
-which is a well-established formalism for the structural description of
-formal languages in computer sciences. An excerpt of the EBNF-definition
-of our domain-specific encoding for the poem looks like this. (We leave out
-the meta-data here. See
+requires a structural description of the domain specific encoding. This is a
+bit similar to a document type definition (DTD) in XML. This structural
+description uses a slightly enhanced version of the [Extended-Backus-Naur-Form
+(EBNF)](https://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_form),
+which is a well-established formalism for the structural description of formal
+languages in computer sciences. An excerpt of the EBNF-definition of our
+domain-specific encoding for the poem looks like this. (We leave out the
+meta-data here. See
 [`examples/Tutorial/Lyrik.ebnf`](https://gitlab.lrz.de/badw-it/DHParser/blob/master/examples/Tutorial/Lyrik.ebnf)
 for the full EBNF):
 
@@ -192,48 +190,53 @@ for the full EBNF):
 
 Without going into too much detail here, let me just explain a few basics of
 this formal description: The slashes `/` enclose ordinary regular expressions.
-Thus, `NZ` for ("Neue Zeile", German for: "new line") is defined as `/\n/~` which
-is the newline-token `\n` in a regular expression, plus further horizontal
-whitespace (signified by the tilde `~`), if there is any.
-
-The braces `{` `}` enclose items that can be repeated zero or more times; with a
-`+` appended to the closing brace it means one or more times. Now, look at the
-definition of `text` in the 6th line: `{ strophe {LEERZEILE} }+`. This reads as
-follows: The text of the poem consists of a sequence of stanzas, each of which
-is followed by a sequence of empty lines (German: "Leerzeilen"). If you now look
-at the structural definition of a stanza, you find that it consists of a sequence
-of verses, each of which starts, i.e. is preceded by a new line.
-
-Can you figure out the rest? Hint: The angular brackets `[` and `]` mean that and
-item is optional and the `§` sign means that it is obligatory. (Strictly speaking,
-the §-signs are not necessary, because an item that is not optional is always
-obligatory, but the §-signs help the converter to produce more useful error
-messages.)
+Thus, `NZ` for ("Neue Zeile", German for: "new line") is defined as `/\n/~`
+which is the newline-token `\n` in a regular expression, plus further
+horizontal whitespace (signified by the tilde `~`), if there is any.
+
+The braces `{` `}` enclose items that can be repeated zero or more times; with
+a `+` appended to the closing brace it means one or more times. Now, look at
+the definition of `text` in the 6th line: `{ strophe {LEERZEILE} }+`. This
+reads as follows: The text of the poem consists of a sequence of stanzas, each
+of which is followed by a sequence of empty lines (German: "Leerzeilen"). If
+you now look at the structural definition of a stanza, you find that it
+consists of a sequence of verses, each of which starts, i.e. is preceded by a
+new line.
+
+Can you figure out the rest? Hint: The angular brackets `[` and `]` mean that
+and item is optional and the `§` sign means that it is obligatory. (Strictly
+speaking, the §-signs are not necessary, because an item that is not optional
+is always obligatory, but the §-signs help the converter to produce more
+useful error messages.)
 
 This should be enough for an introduction to the purpose of DSLs in the
-humanities. It has shown the probably most important use case of
-DHParser, i.e. as a frontend-technology form XML-encodings. Of course,
-it can just as well be used as a frontend for any other kind of
-structured data, like SQL or graph-structured data. The latter is by the
-way is a very reasonable alternative to XML for edition projects with a
-complex transmission history. See Andreas Kuczera's Blog-entry on
-["Graphdatenbanken für Historiker"](http://mittelalter.hypotheses.org/5995).
-
+humanities. It has shown the probably most important use case of DHParser,
+i.e. as a frontend-technology form XML-encodings. Of course, it can just as
+well be used as a frontend for any other kind of structured data, like SQL or
+graph-structured data. The latter is by the way is a very reasonable
+alternative to XML for edition projects with a complex transmission history.
+See Andreas Kuczera's Blog-entry on ["Graphdatenbanken für
+Historiker"](http://mittelalter.hypotheses.org/5995).
 
 Tutorial: First Steps with DHParser
 -----------------------------------
 
-Disclaimer: *You'll need to be able to use a shell and have some basic
-knowledge of Python programming to be able to follow this section!*
+*You'll need to be able to use a shell and have some basic knowledge of Python
+programming to be able to follow this section!* Also, you need to have
+[git](https://git-scm.com/) and [python 3](https://www.python.org/) installed
+on you system. It is important that you have at least python version 3.5.
+DHParser will not work with python 2. You can simply start python to find out
+which version you have got.
 
 In order to try the example above, you should fetch DHParsers from its
-git-repository:
+git-repository. Open a shell and type:
 
     $ git clone git@gitlab.lrz.de:badw-it/DHParser.git
 
-Now, if you enter the repo, you'll find three subdirectories:
+Now, if you enter the repo, you'll find among others these subdirectories:
 
     DHParser
+    documentation
     examples
     test
 
@@ -266,7 +269,7 @@ generated file that contains the actual parser. All other parts - we
 will come to that later what these are - can safely be edited by you.
 Now just run `recompile_grammar.py` from the command line:
 
-    $ python3 recompile_grammar.py
+    $ python recompile_grammar.py
 
 You'll find that `recompile_grammar.py` has generated a new script with
 the name `LyrikCompiler.py`. This script contains the Parser for the
@@ -274,7 +277,7 @@ the name `LyrikCompiler.py`. This script contains the Parser for the
 rather, a DSL-whatever compiler), which you can later fill in. Now let's
 see how this script works:
 
-    $ python3 LyrikCompiler.py Lyrisches_Intermezzo_IV.txt >result.xml
+    $ python LyrikCompiler.py Lyrisches_Intermezzo_IV.txt >result.xml
 
 The file `Lyrisches_Intermezzo_IV.txt` contains the fourth part of
 Heinrich Heine's Lyrisches Intermezzo encoded in our own human-readable
@@ -316,7 +319,6 @@ recognizable!) first verse of the poem:
     </vers>
     ...
 
-
 How come it is so obfuscated, and where do all those pseudo-tags like
 `<:RegExp>` and `<:Whitespace>` come from? Well, this is probably the
 right time to explain a bit about parsing and compilation in general.
@@ -390,8 +392,7 @@ keeps the specification of the AST-transformation simple and concise. At
 the same, we avoid adding hints for the AST-transformation in the
 grammar specification, which would render the grammar less readable.
 
-Next, I am going to explain step by step, how a domain specific language
-for poems like Heine's Lyrisches Intermezzo can be designed, specified,
-compiled and tested.
-
-*to be continued, stay tuned...*
+Now that you have seen how DHParser basically works, it is time to go
+through the process of desining and testing a domain specific notation
+step by step from the very start. Head over to the documentation in
+subdirectory and read the step by step guide.
\ No newline at end of file

dhparser.py

@@ -29,6 +29,8 @@ from DHParser.ebnf import get_ebnf_grammar, get_ebnf_transformer, get_ebnf_compi
 from DHParser.log import logging
 from DHParser.toolkit import re
 
+dhparserdir = os.path.dirname(os.path.realpath(__file__))
+
 EBNF_TEMPLATE = r"""-grammar
 
 #######################################################################
@@ -114,10 +116,11 @@ GRAMMAR_TEST_TEMPLATE = r'''#!/usr/bin/python3
 import os
 import sys
 
-# sys.path.extend(['../../', '../', './'])  # use for developing DHParser
+sys.path.append('{dhparserdir}')
 
 scriptpath = os.path.dirname(__file__)
 
+
 try:
     from DHParser import dsl
     import DHParser.log
@@ -141,10 +144,9 @@ def recompile_grammar(grammar_src, force):
 
 def run_grammar_tests(glob_pattern):
     with DHParser.log.logging(False):
-        print(glob_pattern)
         error_report = testing.grammar_suite(
-            os.path.join(scriptpath, 'grammar_tests'), 
-            get_grammar, get_transformer, 
+            os.path.join(scriptpath, 'grammar_tests'),
+            get_grammar, get_transformer,
             fn_patterns=[glob_pattern], report=True, verbose=True)
     return error_report
 
@@ -154,7 +156,7 @@ if __name__ == '__main__':
     if arg.endswith('.ebnf'):
         recompile_grammar(arg, force=True)
     else:
-        recompile_grammar(os.path.join(scriptpath, '{name}.ebnf'), 
+        recompile_grammar(os.path.join(scriptpath, '{name}.ebnf'),
                           force=False)
         sys.path.append('.')
         from {name}Compiler import get_grammar, get_transformer
@@ -180,7 +182,7 @@ def create_project(path: str):
             print('"%s" already exists! Not overwritten.' % name)
 
     name = os.path.basename(path)
-    if not re.match('(?!\d)\w+', name):
+    if not re.match(r'(?!\d)\w+', name):
         print('Project name "%s" is not a valid identifier! Aborting.' % name)
         sys.exit(1)
     if os.path.exists(path) and not os.path.isdir(path):
@@ -202,7 +204,8 @@ def create_project(path: str):
     create_file(os.path.join('grammar_tests', '02_test_document.ini'), TEST_DOCUMENT_TEMPLATE)
     create_file(name + '.ebnf', '# ' + name + EBNF_TEMPLATE)
     create_file('README.md', README_TEMPLATE.format(name=name))
-    create_file('tst_%s_grammar.py' % name, GRAMMAR_TEST_TEMPLATE.format(name=name))
+    create_file('tst_%s_grammar.py' % name,
+                GRAMMAR_TEST_TEMPLATE.format(name=name, dhparserdir=dhparserdir))
     create_file('example.dsl', 'Life is but a walking shadow\n')
     os.chmod('tst_%s_grammar.py' % name, 0o755)
     os.chdir(curr_dir)

documentation/.buildinfo

+# Sphinx build info version 1
+# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
+config: a864fbe9973eb04d25fc99fca3d8ce3e
+tags: 645f666f9bcd5a90fca523b33c5a78b7

documentation/.gitkeep

+

documentation/ReferenceManual.html

+
+
+<!DOCTYPE html>
+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
+<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
+<head>
+  <meta charset="utf-8">
+  
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  
+  <title>DHParser Reference Manual &mdash; DHParser 0.8 documentation</title>
+  
+
+  
+  
+  
+  
+
+  
+
+  
+  
+    
+
+  
+
+  
+  
+    <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
+  
+
+  
+
+  
+        <link rel="index" title="Index"
+              href="genindex.html"/>
+        <link rel="search" title="Search" href="search.html"/>
+    <link rel="top" title="DHParser 0.8 documentation" href="index.html"/>
+        <link rel="next" title="Module Reference" href="ModuleReference.html"/>
+        <link rel="prev" title="DHParser User’s Guide" href="UserGuide.html"/> 
+
+  
+  <script src="_static/js/modernizr.min.js"></script>
+
+</head>
+
+<body class="wy-body-for-nav" role="document">
+
+   
+  <div class="wy-grid-for-nav">
+
+    
+    <nav data-toggle="wy-nav-shift" class="wy-nav-side">
+      <div class="wy-side-scroll">
+        <div class="wy-side-nav-search">
+          
+
+          
+            <a href="index.html" class="icon icon-home"> DHParser
+          
+
+          
+          </a>
+
+          
+            
+            
+          
+
+          
+<div role="search">
+  <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
+    <input type="text" name="q" placeholder="Search docs" />
+    <input type="hidden" name="check_keywords" value="yes" />
+    <input type="hidden" name="area" value="default" />
+  </form>
+</div>
+
+          
+        </div>
+
+        <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
+          
+            
+            
+              
+            
+            
+              <p class="caption"><span class="caption-text">Contents:</span></p>
+<ul class="current">
+<li class="toctree-l1"><a class="reference internal" href="UserGuide.html">DHParser User’s Guide</a></li>
+<li class="toctree-l1 current"><a class="current reference internal" href="#">DHParser Reference Manual</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="#fundamentals">Fundamentals</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#compiler-creation-workflow">Compiler Creation Workflow</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#component-guide">Component Guide</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#parser">Parser</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#ast-transformation">AST-Transformation</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#compiler">Compiler</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="#module-structure-of-dhparser">Module Structure of DHParser</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#class-hierarchy-of-dhparser">Class Hierarchy of DHParser</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="ModuleReference.html">Module Reference</a></li>
+</ul>
+
+            
+          
+        </div>
+      </div>
+    </nav>
+
+    <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
+
+      
+      <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
+        
+          <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+          <a href="index.html">DHParser</a>
+        
+      </nav>
+
+
+      
+      <div class="wy-nav-content">
+        <div class="rst-content">
+          
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<div role="navigation" aria-label="breadcrumbs navigation">
+
+  <ul class="wy-breadcrumbs">
+    
+      <li><a href="index.html">Docs</a> &raquo;</li>
+        
+      <li>DHParser Reference Manual</li>
+    
+    
+      <li class="wy-breadcrumbs-aside">
+        
+            
+            <a href="_sources/ReferenceManual.rst.txt" rel="nofollow"> View page source</a>
+          
+        
+      </li>
+    
+  </ul>
+
+  
+  <hr/>
+</div>
+          <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
+           <div itemprop="articleBody">
+            
+  <div class="section" id="dhparser-reference-manual">
+<h1>DHParser Reference Manual<a class="headerlink" href="#dhparser-reference-manual" title="Permalink to this headline">¶</a></h1>
+<p>This reference manual explains the technology used by DHParser. It is
+intended for people who would like to extend or contribute to
+DHParser. The reference manual does not explain how a Domain Specific
+Language (DSL) is developed (see the User’s Manual for that). It it
+explains the technical approach that DHParser employs for parsing,
+abstract syntax tree transformation and compilation of a given
+DSL. And it describes the module and class structure of the DHParser
+Software. The programming guide requires a working knowledge of Python
+programming and a basic understanding or common parser technology from
+the reader. Also, it is recommended to read the introduction and the
+user’s guide first.</p>
+<div class="section" id="fundamentals">
+<h2>Fundamentals<a class="headerlink" href="#fundamentals" title="Permalink to this headline">¶</a></h2>
+<p>DHParser is a parser generator aimed at but not restricted to the
+creation of domain specific languages in the Digital Humanities (DH),
+hence the name “DHParser”. In the Digital Humanities, DSLs allow to
+enter annotated texts or data in a human friendly and readable form
+with a Text-Editor. In contrast to the prevailing XML-approach, the
+DSL-approach distinguishes between a human-friendly <em>editing data
+format</em> and a maschine friendly <em>working data format</em> which can be XML
+but does not need to be. Therefore, the DSL-approach requires an
+additional step to reach the <em>working data format</em>, that is, the
+compilation of the annotated text or data written in the DSL (editing
+data format) to the working data format. In the following a text or
+data file wirtten in a DSL will simply be called <em>document</em>. The
+editing data format will also be called <em>source format</em> and the
+working data format be denoted as <em>target format</em>.</p>
+<p>Compiling a document specified in a domain specific language involves the following steps:</p>
+<ol class="arabic simple">
+<li><strong>Parsing</strong> the document which results in a representation of the document as a concrete
+syntax tree.</li>
+<li><strong>Transforming</strong> the concrete syntax tree (CST) into an abstract syntax tree (AST), i.e. a
+streamlined and simplified syntax tree ready for compilation.</li>
+<li><strong>Compiling</strong> the abstract syntax tree into the working data format.</li>
+</ol>
+<p>All of these steps a carried out be the computer without any user intervention, i.e. without the
+need of humans to rewrite or enrich the data during any these steps. A DSL-compiler therefore
+consists of three components which are applied in sequence, a <em>parser</em>, a <em>transformer</em> and a
+<em>compiler</em>. Creating, i.e. programming these components is the task of compiler construction.
+The creation of all of these components is supported by DHParser, albeit to a different degree:</p>
+<ol class="arabic simple">
+<li><em>Creating a parser</em>: DHParser fully automizes parser generation. Once the syntax of the DSL
+is formally specified, it can be compiled into a python class that is able to parse any
+document written in the DSL. DHParser uses Parsing-Expression-Grammars in a variant of the
+Extended-Backus-Naur-Form (EBNF) for the specification of the syntax. (See
+<cite>examples/EBNF/EBNF.ebnf</cite> for an example.)</li>
+<li><em>Specifying the AST-transformations</em>: DHParser supports the AST-transformation with a
+depth-first tree traversal algorithm (see <cite>DHParser.transform.traverse</cite> ) and a number of
+stock transformation functions which can also be combined. Most of the AST-transformation is
+specified in a declarative manner by filling in a transformation-dictionary which associates
+the node-types of the concrete syntax tree with such combinations of transformations. See
+<cite>DHParser.ebnf.EBNF_AST_transformation_table</cite> as an example.</li>
+<li><em>Filling in the compiler class skeleton</em>: Compiler generation cannot be automated like parser
+generation. It is supported by DHParser merely by generating a skeleton of a compiler class
+with a method-stub for each definition (or “production” as the definition are sometimes also
+called) of the EBNF-specification. (See <cite>examples/EBNF/EBNFCompiler.py</cite>) If the target format
+is XML, there is a chance that the XML can simply be generated by serializing the abstract
+syntax tree as XML without the need of a dedicated compilation step.</li>
+</ol>
+</div>
+<div class="section" id="compiler-creation-workflow">
+<h2>Compiler Creation Workflow<a class="headerlink" href="#compiler-creation-workflow" title="Permalink to this headline">¶</a></h2>
+<p>TODO: Describe:
+- setting up a new projekt
+- invoking the DSL Compiler
+- conventions and data types
+- the flat namespace of DH Parser</p>
+</div>
+<div class="section" id="component-guide">
+<h2>Component Guide<a class="headerlink" href="#component-guide" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="parser">
+<h3>Parser<a class="headerlink" href="#parser" title="Permalink to this headline">¶</a></h3>
+<p>Parser-creation if supported by DHParser by an EBNF to Python compiler which yields a working
+python class that parses any document the EBNF-specified DSL to a tree of Node-objects, which
+are instances of the <cite>class Node</cite> defined in <cite>DHParser/snytaxtree.py</cite></p>
+<p>The EBNF to Python compiler is actually a DSL-compiler that has been crafted with DHParser
+itself. It is located in <cite>DHParser/enbf.py</cite>. The formal specification of the EBNF variant
+used by DHParser can be found in <cite>examples/EBNF/EBNF.ebnf</cite>. Comparing the automatically
+generated <cite>examples/EBNF/EBNFCompiler.py</cite> with <cite>DHParser/ebnf.py</cite> can give you an idea what
+additional work is needed to create a DSL-compiler from an autogenerated DSL-parser. In most
+DH-projects this task will be less complex, however, as the target format is XML which
+usually can be derived from the abstract syntax tree with fewer steps than the Python code in
+the case of DHParser’s EBNF to Python compiler.</p>
+</div>
+<div class="section" id="ast-transformation">
+<h3>AST-Transformation<a class="headerlink" href="#ast-transformation" title="Permalink to this headline">¶</a></h3>
+<p>Other than for the compiler generation (see the next point below), a functional rather than
+object-oriented approach has been employed, because it allows for a more concise
+specification of the AST-transformation since typically the same combination of
+transformations can be used for several node types of the AST. It would therefore be tedious
+to fill in a method for each of these. In a sense, the specification of AST-transformation
+constitutes an “internal DSL” realized with the means of the Python language itself.</p>
+</div>
+<div class="section" id="compiler">
+<h3>Compiler<a class="headerlink" href="#compiler" title="Permalink to this headline">¶</a></h3>
+</div>
+</div>
+<div class="section" id="module-structure-of-dhparser">
+<h2>Module Structure of DHParser<a class="headerlink" href="#module-structure-of-dhparser" title="Permalink to this headline">¶</a></h2>
+</div>
+<div class="section" id="class-hierarchy-of-dhparser">
+<h2>Class Hierarchy of DHParser<a class="headerlink" href="#class-hierarchy-of-dhparser" title="Permalink to this headline">¶</a></h2>
+</div>
+</div>
+
+
+           </div>
+           <div class="articleComments">
+            
+           </div>
+          </div>
+          <footer>
+  
+    <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
+      
+        <a href="ModuleReference.html" class="btn btn-neutral float-right" title="Module Reference" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a>
+      
+      
+        <a href="UserGuide.html" class="btn btn-neutral" title="DHParser User’s Guide" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a>
+      
+    </div>
+  
+
+  <hr/>
+
+  <div role="contentinfo">
+    <p>
+        &copy; Copyright 2018, Eckhart Arnold.
+
+    </p>
+  </div>
+  Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. 
+