Railroad Diagram Improvements (#220)

* Add diagram documentation, add more diagram tests, allow more customization of diagrams * Remove accidental edit of unrelated documentation
author: Michael Milton <ttmigueltt@gmail.com> 2020-06-03 20:18:08 +1000
committer: GitHub <noreply@github.com> 2020-06-03 05:18:08 -0500
commit: 22940c8f44162641ff4000a463f99134a28a9a5a (patch)
tree: 040284584072ad988c153f5331f131e0b3e17af2 /docs
parent: 58c171bb5077f615dc36fc55f470a462e56da891 (diff)
download: pyparsing-git-22940c8f44162641ff4000a463f99134a28a9a5a.tar.gz
2 files changed, 289 insertions, 0 deletions
diff --git a/docs/HowToUsePyparsing.rst b/docs/HowToUsePyparsing.rst
index 8d8582c..9af6862 100644
--- a/docs/HowToUsePyparsing.rst
+++ b/docs/HowToUsePyparsing.rst
@@ -1043,3 +1043,61 @@ Common string and token constants
 
 - ``restOfLine`` - all remaining printable characters up to but not including the next
   newline
+
+Generating Railroad Diagrams
+============================
+Grammars are conventionally represented in what are called "railroad diagrams", which allow you to visually follow
+the sequence of tokens in a grammar along lines which are a bit like train tracks. You might want to generate a
+railroad diagram for your grammar in order to better understand it yourself, or maybe to communicate it to others.
+
+Usage
+-----
+To generate a railroad diagram in pyparsing, you first have to install pyparsing with the ``diagrams`` extra.
+To do this, just run ``pip install pyparsing[diagrams]``, and make sure you add ``pyparsing[diagrams]`` to any
+``setup.py`` or ``requirements.txt`` that specifies pyparsing as a dependency.
+
+Next, run :py:func:`pyparsing.diagrams.to_railroad` to convert your grammar into a form understood by the
+`railroad-diagrams <https://github.com/tabatkins/railroad-diagrams/blob/gh-pages/README-py.md>`_ module, and then :py:func:`pyparsing.diagrams.railroad_to_html` to convert that into an HTML document. For example::
+
+    from pyparsing.diagram import to_railroad, railroad_to_html
+
+    with open('output.html', 'w') as fp:
+        railroad = to_railroad(my_grammar)
+        fp.write(railroad_to_html(railroad))
+
+This will result in the railroad diagram being written to ``output.html``
+
+Example
+-------
+You can view an example railroad diagram generated from a pyparsing grammar `here <_static/json.html>`_.
+
+Customization
+-------------
+You can customize the resulting diagram in a few ways.
+
+Firstly, you can pass in additional keyword arguments to :py:func:`pyparsing.diagrams.to_railroad`, which will be passed
+into the ``Diagram()`` constructor of the underlying library, as explained `here <https://github.com/tabatkins/railroad-diagrams/blob/gh-pages/README-py.md#diagrams>`_.
+
+Secondly, you can edit global options in the underlying library, by editing constants::
+
+    from pyparsing.diagram import to_railroad, railroad_to_html
+    import railroad
+
+    railroad.DIAGRAM_CLASS = "my-custom-class"
+    my_railroad = to_railroad(my_grammar)
+
+These options are documented `here <https://github.com/tabatkins/railroad-diagrams/blob/gh-pages/README-py.md#options>`_.
+
+Finally, you can edit the HTML produced by :py:func:`pyparsing.diagrams.railroad_to_html` by passing in certain keyword
+arguments that will be used in the HTML template. Currently, these are:
+
+- ``head``: A string containing HTML to use in the ``<head>`` tag. This might be a stylesheet or other metadata
+- ``body``: A string containing HTML to use in the ``<body>`` tag, above the actual diagram. This might consist of a
+  heading, description, or JavaScript.
+
+If you want to provide a custom stylesheet using the ``head`` keyword, you can make use of the following CSS classes:
+
+- ``railroad-group``: A group containing everything relating to a given element group (ie something with a heading)
+- ``railroad-heading``: The title for each group
+- ``railroad-svg``: A div containing only the diagram SVG for each group
+- ``railroad-description``: A div containing the group description (unused)
diff --git a/docs/_static/json.html b/docs/_static/json.html
new file mode 100644
index 0000000..7067e5e
--- /dev/null
+++ b/docs/_static/json.html
@@ -0,0 +1,231 @@
+<!DOCTYPE html>
+<html>
+<head>
+    
+        <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300&display=swap" rel="stylesheet">
+        <style type="text/css">
+            .railroad-heading {
+                font-family: 'Roboto', sans-serif;
+            }
+        </style>
+    
+</head>
+<body>
+
+
+    <div class="railroad-group">
+        <h1 class="railroad-heading">Grammar</h1>
+        <div class="railroad-description"></div>
+        <div class="railroad-svg">
+            <svg class="railroad-diagram" height="62" viewBox="0 0 179.5 62" width="179.5" xmlns="http://www.w3.org/2000/svg">
+<g transform="translate(.5 .5)">
+<style>/* <![CDATA[ */
+	svg.railroad-diagram {
+		background-color:hsl(30,20%,95%);
+	}
+	svg.railroad-diagram path {
+		stroke-width:3;
+		stroke:black;
+		fill:rgba(0,0,0,0);
+	}
+	svg.railroad-diagram text {
+		font:bold 14px monospace;
+		text-anchor:middle;
+	}
+	svg.railroad-diagram text.label{
+		text-anchor:start;
+	}
+	svg.railroad-diagram text.comment{
+		font:italic 12px monospace;
+	}
+	svg.railroad-diagram rect{
+		stroke-width:3;
+		stroke:black;
+		fill:hsl(120,100%,90%);
+	}
+	svg.railroad-diagram rect.group-box {
+		stroke: gray;
+		stroke-dasharray: 10 5;
+		fill: none;
+	}
+
+/* ]]> */
+</style><g>
+<path d="M20 21v20m10 -20v20m-10 -10h20"></path></g><path d="M40 31h10"></path><g class="non-terminal">
+<path d="M50 31h0.0"></path><path d="M129.5 31h0.0"></path><rect height="22" width="79.5" x="50.0" y="20"></rect><text x="89.75" y="35">Group 1</text></g><path d="M129.5 31h10"></path><path d="M 139.5 31 h 20 m -10 -10 v 20 m 10 -20 v 20"></path></g></svg>
+        </div>
+    </div>
+
+    <div class="railroad-group">
+        <h1 class="railroad-heading">Group 1</h1>
+        <div class="railroad-description"></div>
+        <div class="railroad-svg">
+            <svg class="railroad-diagram" height="166" viewBox="0 0 2205.0 166" width="2205.0" xmlns="http://www.w3.org/2000/svg">
+<g transform="translate(.5 .5)">
+<style>/* <![CDATA[ */
+	svg.railroad-diagram {
+		background-color:hsl(30,20%,95%);
+	}
+	svg.railroad-diagram path {
+		stroke-width:3;
+		stroke:black;
+		fill:rgba(0,0,0,0);
+	}
+	svg.railroad-diagram text {
+		font:bold 14px monospace;
+		text-anchor:middle;
+	}
+	svg.railroad-diagram text.label{
+		text-anchor:start;
+	}
+	svg.railroad-diagram text.comment{
+		font:italic 12px monospace;
+	}
+	svg.railroad-diagram rect{
+		stroke-width:3;
+		stroke:black;
+		fill:hsl(120,100%,90%);
+	}
+	svg.railroad-diagram rect.group-box {
+		stroke: gray;
+		stroke-dasharray: 10 5;
+		fill: none;
+	}
+
+/* ]]> */
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+        </div>
+    </div>
+
+    <div class="railroad-group">
+        <h1 class="railroad-heading">Group 2</h1>
+        <div class="railroad-description"></div>
+        <div class="railroad-svg">
+            <svg class="railroad-diagram" height="422" viewBox="0 0 978.0 422" width="978.0" xmlns="http://www.w3.org/2000/svg">
+<g transform="translate(.5 .5)">
+<style>/* <![CDATA[ */
+	svg.railroad-diagram {
+		background-color:hsl(30,20%,95%);
+	}
+	svg.railroad-diagram path {
+		stroke-width:3;
+		stroke:black;
+		fill:rgba(0,0,0,0);
+	}
+	svg.railroad-diagram text {
+		font:bold 14px monospace;
+		text-anchor:middle;
+	}
+	svg.railroad-diagram text.label{
+		text-anchor:start;
+	}
+	svg.railroad-diagram text.comment{
+		font:italic 12px monospace;
+	}
+	svg.railroad-diagram rect{
+		stroke-width:3;
+		stroke:black;
+		fill:hsl(120,100%,90%);
+	}
+	svg.railroad-diagram rect.group-box {
+		stroke: gray;
+		stroke-dasharray: 10 5;
+		fill: none;
+	}
+
+/* ]]> */
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author	Michael Milton <ttmigueltt@gmail.com>	2020-06-03 20:18:08 +1000
committer	GitHub <noreply@github.com>	2020-06-03 05:18:08 -0500
commit	22940c8f44162641ff4000a463f99134a28a9a5a (patch)
tree	040284584072ad988c153f5331f131e0b3e17af2 /docs
parent	58c171bb5077f615dc36fc55f470a462e56da891 (diff)
download	pyparsing-git-22940c8f44162641ff4000a463f99134a28a9a5a.tar.gz