Added documentation for the grammar

Author: Bernardo-MG

docs/source/conf.py

@@ -116,7 +116,8 @@
                            ('Usage', './usage.html')],
     'navbar_links': [('Documentation', [('Acquire', './acquire.html'),
                                         ('Usage', './usage.html'),
-                                        ('Dice model', './docs/dice.html')]),
+                                        ('Dice model', './docs/dice.html'),
+                                        ('Grammar', './docs/grammar.html')]),
                      ('Info and Reports', [('Reports', './reports.html'),
                                            ('Code docs', './code/index.html')])],
 }

docs/source/docs/grammar.rst

@@ -0,0 +1,27 @@
+=======
+Grammar
+=======
+
+Only the most basic grammar is supported. This means basic operations with
+numbers and dice, and only common dice notation which excludes anything fancy
+such as percentile or Fudge dice.
+
+The grammar is generated from code, so it is not included in a file.
+
+--------
+Operands
+--------
+
+The following values can appear in the grammar as operands:
+
+- Dice, in the style of 2d6.
+- Numbers, but only integer values.
+
+----------
+Operations
+----------
+
+Only basic arithmetic operations are supported, and these can be applied any valid operand:
+
+- Addition
+- Subtraction

docs/source/index.rst

@@ -25,3 +25,4 @@ Features
    reports
    code/index
    docs/dice
+   docs/grammar