Add support for BDD features / stories (#1803)

* Create BDD.py

Initialize the lexer file of BDD
Add keywords of BDD

* Update the 'RegexLexer'

* Edit and test

* Update BDD.py

* Update BDD.py

* Update the BddLexer file

* Update the BddLexer of root tokens

* edit bdd

Add regular expression for tokens

* edit bdd

Add regular expression for tokens

* add .gitignore

* updata bdd.lexer

* Delete bdd.py

* Update the Keywords, Numbers, Punctuation token

* bdd.py

Assign different colors to keywords, punctuation, numbers, and variables.

* Update the BddLexer file

* Update bdd.py

Fix the file name.

* Add the detection for '@'

Co-Authored-By: OMGJL <8707895+OMGJL@users.noreply.github.com>

* Update bdd.py

Add detection of double quotes.

Co-Authored-By: OMGJL <8707895+OMGJL@users.noreply.github.com>

* Fix the double quotes

* fix the quote recognition

* add comments

* update the root dir

* add bdd test cases

* Delete .DS_Store

* Delete .DS_Store

* Delete .DS_Store

* remove DS file

* restore the gitignore file

* update the bdd lexer

* update the bdd lexer

* update the whitespace highlight

* update the whitespace highlight

* refactor the bdd.py

* update the punctuation

* update the punctuation

* update bdd token

Change "." to the "\S+",
Which reduce the test output file size.

Co-Authored-By: OMGJL <8707895+OMGJL@users.noreply.github.com>

* Update bdd.py

Reduce the new token for each space

Co-authored-by: Hongyuan Yan <hongyuan.yan@student.adelaide.edu.au>
Co-authored-by: OMGJL <lzhsjunkmail@gmail.com>
Co-authored-by: Hongyuan Yan <54675432+kirito330824@users.noreply.github.com>
Co-authored-by: Jessie2110 <71688609+Jessie2110@users.noreply.github.com>
Co-authored-by: Jessie2110 <wuqiong2110@gmail.com>
Co-authored-by: OMGJL <8707895+OMGJL@users.noreply.github.com>

6 files changed, 431 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
index 0e541dcd..60078fc7 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -221,6 +221,7 @@ Other contributors, listed alphabetically, are:
 * Brian Tiffin -- OpenCOBOL lexer
 * Bob Tolbert -- Hy lexer
 * Matthias Trute -- Forth lexer
+* Tuoa Spi T4 -- Bdd lexer
 * Erick Tryzelaar -- Felix lexer
 * Alexander Udalov -- Kotlin lexer improvements
 * Thomas Van Doren -- Chapel lexer
diff --git a/doc/languages.rst b/doc/languages.rst
index ecd8ff56..bfb84374 100644
--- a/doc/languages.rst
+++ b/doc/languages.rst
@@ -221,6 +221,7 @@ Other markup
 * Apache config files
 * Apache Pig
 * BBCode
+* Bdd
 * CapDL
 * `Cap'n Proto <https://capnproto.org>`_
 * `CDDL <https://datatracker.ietf.org/doc/rfc8610/>`_
diff --git a/pygments/lexers/_mapping.py b/pygments/lexers/_mapping.py
index ae42b7bc..ab7be87d 100644
--- a/pygments/lexers/_mapping.py
+++ b/pygments/lexers/_mapping.py
@@ -57,6 +57,7 @@ LEXERS = {
     'BashLexer': ('pygments.lexers.shell', 'Bash', ('bash', 'sh', 'ksh', 'zsh', 'shell'), ('*.sh', '*.ksh', '*.bash', '*.ebuild', '*.eclass', '*.exheres-0', '*.exlib', '*.zsh', '.bashrc', 'bashrc', '.bash_*', 'bash_*', 'zshrc', '.zshrc', '.kshrc', 'kshrc', 'PKGBUILD'), ('application/x-sh', 'application/x-shellscript', 'text/x-shellscript')),
     'BashSessionLexer': ('pygments.lexers.shell', 'Bash Session', ('console', 'shell-session'), ('*.sh-session', '*.shell-session'), ('application/x-shell-session', 'application/x-sh-session')),
     'BatchLexer': ('pygments.lexers.shell', 'Batchfile', ('batch', 'bat', 'dosbatch', 'winbatch'), ('*.bat', '*.cmd'), ('application/x-dos-batch',)),
+    'BddLexer': ('pygments.lexers.bdd', 'Bdd', ('bdd',), ('*.feature',), ('text/x-bdd',)),
     'BefungeLexer': ('pygments.lexers.esoteric', 'Befunge', ('befunge',), ('*.befunge',), ('application/x-befunge',)),
     'BibTeXLexer': ('pygments.lexers.bibtex', 'BibTeX', ('bibtex', 'bib'), ('*.bib',), ('text/x-bibtex',)),
     'BlitzBasicLexer': ('pygments.lexers.basic', 'BlitzBasic', ('blitzbasic', 'b3d', 'bplus'), ('*.bb', '*.decls'), ('text/x-bb',)),
diff --git a/pygments/lexers/bdd.py b/pygments/lexers/bdd.py
new file mode 100644
index 00000000..f65745b0
--- /dev/null
+++ b/pygments/lexers/bdd.py
@@ -0,0 +1,53 @@
+"""
+    pygments.lexers.bdd
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for BDD(Behavior-driven development). 
+    More information: https://en.wikipedia.org/wiki/Behavior-driven_development
+
+    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, include
+from pygments.token import Comment, Keyword, Name, String, Number, Text, Punctuation, Whitespace
+
+__all__ = ['BddLexer']
+
+class BddLexer(RegexLexer):
+    """
+    Lexer for BDD(Behavior-driven development), which highlights not only keywords, 
+    but also comments, punctuations, strings, numbers, and variables.
+
+    .. versionadded:: 2.10
+    """
+
+    name = 'Bdd'
+    aliases = ['bdd']
+    filenames = ['*.feature']
+    mimetypes = ['text/x-bdd']
+
+    step_keywords = r'Given|When|Then|Add|And|Feature|Scenario Outline|Scenario|Background|Examples|But'
+
+    tokens = {
+        'comments': [
+            (r'^\s*#.*$', Comment),
+        ],
+        'miscellaneous': [
+            (r'(<|>|\[|\]|=|\||:|\(|\)|\{|\}|,|\.|;|-|_|\$)', Punctuation),
+            (r'((?<=\<)[^\\>]+(?=\>))', Name.Variable),
+            (r'"([^\"]*)"', String),
+            (r'^@\S+', Name.Label),
+        ],
+        'numbers': [
+            (r'(\d+\.?\d*|\d*\.\d+)([eE][+-]?[0-9]+)?', Number),
+        ],
+        'root': [
+            (r'\n|\s+', Whitespace),
+            (step_keywords, Keyword),
+            include('comments'),
+            include('miscellaneous'),
+            include('numbers'),            
+            (r'\S+', Text),
+        ]
+    }
\ No newline at end of file
diff --git a/tests/examplefiles/bdd/example.feature b/tests/examplefiles/bdd/example.feature
new file mode 100644
index 00000000..e819dd27
--- /dev/null
+++ b/tests/examplefiles/bdd/example.feature
@@ -0,0 +1,31 @@
+#!text
+View Quotes should do something
+Meta:
+@verifies G989
+
+Feature: Serve coffee
+    Coffee should not be served until paid for
+    Coffee should not be served until the button has been pressed
+    If there is no coffee left then money should be refunded
+
+  Background:
+    Given a global administrator named "Greg"
+    And a blog named "Greg's anti-tax rants"
+    And a customer named "Dr. Bill"
+    And a blog named "Expensive Therapy" owned by "Dr. Bill"
+
+  Scenario: Buy last coffee
+    Given there are 1 coffees left in the machine
+    And I have deposited 1$
+    When I press the coffee button
+    Then I should be served a coffee
+
+  Scenario Outline: eating
+    Given there are <start> cucumbers
+    When I eat <eat> cucumbers
+    Then I should have <left> cucumbers
+
+    Examples:
+      | start | eat | left |
+      |  12   |  5  |  7   |
+      |  20   |  5  |  15  |
\ No newline at end of file
diff --git a/tests/examplefiles/bdd/example.feature.output b/tests/examplefiles/bdd/example.feature.output
new file mode 100644
index 00000000..3946f1c4
--- /dev/null
+++ b/tests/examplefiles/bdd/example.feature.output
@@ -0,0 +1,344 @@
+'#!text'      Comment
+'\n'          Text.Whitespace
+
+'View'        Text
+' '           Text.Whitespace
+'Quotes'      Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'do'          Text
+' '           Text.Whitespace
+'something'   Text
+'\n'          Text.Whitespace
+
+'Meta:'       Text
+'\n'          Text.Whitespace
+
+'@verifies'   Name.Label
+' '           Text.Whitespace
+'G989'        Text
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'Feature'     Keyword
+':'           Punctuation
+' '           Text.Whitespace
+'Serve'       Text
+' '           Text.Whitespace
+'coffee'      Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Coffee'      Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'not'         Text
+' '           Text.Whitespace
+'be'          Text
+' '           Text.Whitespace
+'served'      Text
+' '           Text.Whitespace
+'until'       Text
+' '           Text.Whitespace
+'paid'        Text
+' '           Text.Whitespace
+'for'         Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Coffee'      Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'not'         Text
+' '           Text.Whitespace
+'be'          Text
+' '           Text.Whitespace
+'served'      Text
+' '           Text.Whitespace
+'until'       Text
+' '           Text.Whitespace
+'the'         Text
+' '           Text.Whitespace
+'button'      Text
+' '           Text.Whitespace
+'has'         Text
+' '           Text.Whitespace
+'been'        Text
+' '           Text.Whitespace
+'pressed'     Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'If'          Text
+' '           Text.Whitespace
+'there'       Text
+' '           Text.Whitespace
+'is'          Text
+' '           Text.Whitespace
+'no'          Text
+' '           Text.Whitespace
+'coffee'      Text
+' '           Text.Whitespace
+'left'        Text
+' '           Text.Whitespace
+'then'        Text
+' '           Text.Whitespace
+'money'       Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'be'          Text
+' '           Text.Whitespace
+'refunded'    Text
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'  '          Text.Whitespace
+'Background'  Keyword
+':'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Given'       Keyword
+' '           Text.Whitespace
+'a'           Text
+' '           Text.Whitespace
+'global'      Text
+' '           Text.Whitespace
+'administrator' Text
+' '           Text.Whitespace
+'named'       Text
+' '           Text.Whitespace
+'"Greg"'      Literal.String
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'And'         Keyword
+' '           Text.Whitespace
+'a'           Text
+' '           Text.Whitespace
+'blog'        Text
+' '           Text.Whitespace
+'named'       Text
+' '           Text.Whitespace
+'"Greg\'s anti-tax rants"' Literal.String
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'And'         Keyword
+' '           Text.Whitespace
+'a'           Text
+' '           Text.Whitespace
+'customer'    Text
+' '           Text.Whitespace
+'named'       Text
+' '           Text.Whitespace
+'"Dr. Bill"'  Literal.String
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'And'         Keyword
+' '           Text.Whitespace
+'a'           Text
+' '           Text.Whitespace
+'blog'        Text
+' '           Text.Whitespace
+'named'       Text
+' '           Text.Whitespace
+'"Expensive Therapy"' Literal.String
+' '           Text.Whitespace
+'owned'       Text
+' '           Text.Whitespace
+'by'          Text
+' '           Text.Whitespace
+'"Dr. Bill"'  Literal.String
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'  '          Text.Whitespace
+'Scenario'    Keyword
+':'           Punctuation
+' '           Text.Whitespace
+'Buy'         Text
+' '           Text.Whitespace
+'last'        Text
+' '           Text.Whitespace
+'coffee'      Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Given'       Keyword
+' '           Text.Whitespace
+'there'       Text
+' '           Text.Whitespace
+'are'         Text
+' '           Text.Whitespace
+'1'           Literal.Number
+' '           Text.Whitespace
+'coffees'     Text
+' '           Text.Whitespace
+'left'        Text
+' '           Text.Whitespace
+'in'          Text
+' '           Text.Whitespace
+'the'         Text
+' '           Text.Whitespace
+'machine'     Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'And'         Keyword
+' '           Text.Whitespace
+'I'           Text
+' '           Text.Whitespace
+'have'        Text
+' '           Text.Whitespace
+'deposited'   Text
+' '           Text.Whitespace
+'1'           Literal.Number
+'$'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'When'        Keyword
+' '           Text.Whitespace
+'I'           Text
+' '           Text.Whitespace
+'press'       Text
+' '           Text.Whitespace
+'the'         Text
+' '           Text.Whitespace
+'coffee'      Text
+' '           Text.Whitespace
+'button'      Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Then'        Keyword
+' '           Text.Whitespace
+'I'           Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'be'          Text
+' '           Text.Whitespace
+'served'      Text
+' '           Text.Whitespace
+'a'           Text
+' '           Text.Whitespace
+'coffee'      Text
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'  '          Text.Whitespace
+'Scenario Outline' Keyword
+':'           Punctuation
+' '           Text.Whitespace
+'eating'      Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Given'       Keyword
+' '           Text.Whitespace
+'there'       Text
+' '           Text.Whitespace
+'are'         Text
+' '           Text.Whitespace
+'<'           Punctuation
+'start'       Name.Variable
+'>'           Punctuation
+' '           Text.Whitespace
+'cucumbers'   Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'When'        Keyword
+' '           Text.Whitespace
+'I'           Text
+' '           Text.Whitespace
+'eat'         Text
+' '           Text.Whitespace
+'<'           Punctuation
+'eat'         Name.Variable
+'>'           Punctuation
+' '           Text.Whitespace
+'cucumbers'   Text
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Then'        Keyword
+' '           Text.Whitespace
+'I'           Text
+' '           Text.Whitespace
+'should'      Text
+' '           Text.Whitespace
+'have'        Text
+' '           Text.Whitespace
+'<'           Punctuation
+'left'        Name.Variable
+'>'           Punctuation
+' '           Text.Whitespace
+'cucumbers'   Text
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'Examples'    Keyword
+':'           Punctuation
+'\n'          Text.Whitespace
+
+'      '      Text.Whitespace
+'|'           Punctuation
+' '           Text.Whitespace
+'start'       Text
+' '           Text.Whitespace
+'|'           Punctuation
+' '           Text.Whitespace
+'eat'         Text
+' '           Text.Whitespace
+'|'           Punctuation
+' '           Text.Whitespace
+'left'        Text
+' '           Text.Whitespace
+'|'           Punctuation
+'\n'          Text.Whitespace
+
+'      '      Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'12'          Literal.Number
+'   '         Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'5'           Literal.Number
+'  '          Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'7'           Literal.Number
+'   '         Text.Whitespace
+'|'           Punctuation
+'\n'          Text.Whitespace
+
+'      '      Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'20'          Literal.Number
+'   '         Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'5'           Literal.Number
+'  '          Text.Whitespace
+'|'           Punctuation
+'  '          Text.Whitespace
+'15'          Literal.Number
+'  '          Text.Whitespace
+'|'           Punctuation
+'\n'          Text.Whitespace