Add support for partials and path segments for Handlebars.

This introduces support for some missing features to the Handlebars lexer:
Partials and path segments. Partials mostly appeared to work before, but the
`>` in `{{> ... }}` would appear as a syntax error, as could other
components of the partial. This change introduces support for:

* Standard partials: `{{> partialName}}`
* Partials with parameters: `{{> partialName varname="value"}}`
* Ddynamic partials: `{{> (partialFunc)}}`
* Ddynamic partials with lookups: `{{> (lookup ../path "partialName")}}`
* Partial blocks: `{{> @partial-block}}`
* Inline partials: `{{#*inline}}..{{/inline}}`

It also introduces support for path segments, which can reference content in
the current context or in a parent context. For instance, `this.name`,
`this/name`, `./name`, `../name`, `this/name`, etc. These are all now tracked
as variables.

1 files changed, 64 insertions, 0 deletions

diff --git a/pygments/lexers/nit.py b/pygments/lexers/nit.py
new file mode 100644
index 00000000..ab59c4e5
--- /dev/null
+++ b/pygments/lexers/nit.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.nit
+    ~~~~~~~~~~~~~~~~~~~
+
+    Lexer for the Nit language.
+
+    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, words
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation
+
+__all__ = ['NitLexer']
+
+
+class NitLexer(RegexLexer):
+    """
+    For `nit <http://nitlanguage.org>`_ source.
+
+    .. versionadded:: 2.0
+    """
+
+    name = 'Nit'
+    aliases = ['nit']
+    filenames = ['*.nit']
+    tokens = {
+        'root': [
+            (r'#.*?$', Comment.Single),
+            (words((
+                'package', 'module', 'import', 'class', 'abstract', 'interface',
+                'universal', 'enum', 'end', 'fun', 'type', 'init', 'redef',
+                'isa', 'do', 'readable', 'writable', 'var', 'intern', 'extern',
+                'public', 'protected', 'private', 'intrude', 'if', 'then',
+                'else', 'while', 'loop', 'for', 'in', 'and', 'or', 'not',
+                'implies', 'return', 'continue', 'break', 'abort', 'assert',
+                'new', 'is', 'once', 'super', 'self', 'true', 'false', 'nullable',
+                'null', 'as', 'isset', 'label', '__debug__'), suffix=r'(?=[\r\n\t( ])'),
+             Keyword),
+            (r'[A-Z]\w*', Name.Class),
+            (r'"""(([^\'\\]|\\.)|\\r|\\n)*((\{\{?)?(""?\{\{?)*""""*)', String),  # Simple long string
+            (r'\'\'\'(((\\.|[^\'\\])|\\r|\\n)|\'((\\.|[^\'\\])|\\r|\\n)|'
+             r'\'\'((\\.|[^\'\\])|\\r|\\n))*\'\'\'', String),  # Simple long string alt
+            (r'"""(([^\'\\]|\\.)|\\r|\\n)*((""?)?(\{\{?""?)*\{\{\{\{*)', String),  # Start long string
+            (r'\}\}\}(((\\.|[^\'\\])|\\r|\\n))*(""?)?(\{\{?""?)*\{\{\{\{*', String),  # Mid long string
+            (r'\}\}\}(((\\.|[^\'\\])|\\r|\\n))*(\{\{?)?(""?\{\{?)*""""*', String),  # End long string
+            (r'"(\\.|([^"}{\\]))*"', String),  # Simple String
+            (r'"(\\.|([^"}{\\]))*\{', String),  # Start string
+            (r'\}(\\.|([^"}{\\]))*\{', String),  # Mid String
+            (r'\}(\\.|([^"}{\\]))*"', String),  # End String
+            (r'(\'[^\'\\]\')|(\'\\.\')', String.Char),
+            (r'[0-9]+', Number.Integer),
+            (r'[0-9]*.[0-9]+', Number.Float),
+            (r'0(x|X)[0-9A-Fa-f]+', Number.Hex),
+            (r'[a-z]\w*', Name),
+            (r'_\w+', Name.Variable.Instance),
+            (r'==|!=|<==>|>=|>>|>|<=|<<|<|\+|-|=|/|\*|%|\+=|-=|!|@', Operator),
+            (r'\(|\)|\[|\]|,|\.\.\.|\.\.|\.|::|:', Punctuation),
+            (r'`\{[^`]*`\}', Text),  # Extern blocks won't be Lexed by Nit
+            (r'[\r\n\t ]+', Text),
+        ],
+    }