[update] use cloud theme and add chapter 2

Signed-off-by: PythonShell <pythonshell@yeah.net>

Author: PythonShell

chap02.rst

@@ -0,0 +1,55 @@
+第二章 DOT 语言
+==============================================================================
+
+2.1 图(graph|digraph)的定义
+------------------------------------------------------------------------------
+
+.. code-block:: none
+    :linenos:
+    :caption: Definition of Graph
+
+    graph : [*strict*] (*graph* | *digraph*) [ID] '{' stmt_list '}'
+
+DOT 语言内定义图，主要有三部分：图类型的声明、图的名称和图的具体内容。
+
+:code:`[strict] (graph | digraph)` 是对图类型的定义， :code:`graph` 用于定义一\
+般由点和线段组成的无向图，而 :code:`digraph` 则用于定义有向图。  :code:`strict`
+是可选的，用于限制是否启用严格的语法。关于严格的语法，会在后续讲到，一般不需要\
+声明 :code:`strict` 。
+
+:code:`[ID]` 是对图名称的声明，一般由描述该图的名称的英文表示。
+
+:code:`'{' stmt_list '}'` 是图的具体内容，由一段被英文花括号包裹的语句列表组\
+成。语句列表的定义如下：
+
+2.2 语句(stmt)的定义
+------------------------------------------------------------------------------
+
+.. code-block:: none
+    :linenos:
+    :caption: Definition of Statement List
+
+    stmt_list : [ stmt [';'] stmt_list ]
+
+上述的定义是递归定义，简单的理解就是 :code:`stmt_list` 是由多个 :code:`stmt`
+组成的，多个 :code:`stmt` 之间使用英文分号分隔。
+
+.. code-block:: none
+    :linenos:
+    :caption: Definition of Statement
+
+    stmt : node_stmt | edge_stmt | attr_stmt | ID '=' ID | subgraph
+
+2.2.1 属性语句(attr_stmt)的定义
+..............................................................................
+
+.. code-block:: none
+    :linenos:
+    :caption: Definition of Attribute Statement
+
+    attr_stmt : (*graph* | *node* | *edge*) attr_list
+    edge_stmt : (node_id | subgraph) edgeRHS [ attr_list ]
+    node_stmt : node_id [ attr_list ]
+
+
+

conf.py

@@ -20,8 +20,9 @@
 # import sys
 # sys.path.insert(0, os.path.abspath('.'))
 
-#import cloud_sptheme as csp
+import cloud_sptheme as csp
 #import sphinx_bootstrap_theme
+#import sphinx_rtd_theme
 
 
 # -- General configuration ------------------------------------------------
@@ -95,14 +96,14 @@
 #
 #html_theme = 'alabaster'
 #html_theme = 'sphinxdoc'
-html_theme = 'default'
+#html_theme = 'sphinx_rtd_theme'
 
 # Cloud Theme
-#html_theme = 'cloud'
+html_theme = 'cloud'
 # set the theme path to point to cloud's theme data
-#html_theme_path = [csp.get_theme_dir()]
+html_theme_path = [csp.get_theme_dir()]
 # [optional] set some of the options listed above...
-#html_theme_options = { "roottarget": "index" }
+html_theme_options = { "roottarget": "index" }
 
 # Sphinx Bootstrap Theme
 #html_theme = 'bootstrap'

index.rst

@@ -10,6 +10,7 @@ Graphviz Tutorial 目录
    :maxdepth: 2
 
    chap01
+   chap02
 
 
 参考资料

requirments.txt

@@ -0,0 +1,2 @@
+sphinx
+cloud_sptheme