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, 182 insertions, 0 deletions

diff --git a/pygments/formatters/irc.py b/pygments/formatters/irc.py
new file mode 100644
index 00000000..d1eed0ac
--- /dev/null
+++ b/pygments/formatters/irc.py
@@ -0,0 +1,182 @@
+# -*- coding: utf-8 -*-
+"""
+    pygments.formatters.irc
+    ~~~~~~~~~~~~~~~~~~~~~~~
+
+    Formatter for IRC output
+
+    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import sys
+
+from pygments.formatter import Formatter
+from pygments.token import Keyword, Name, Comment, String, Error, \
+    Number, Operator, Generic, Token, Whitespace
+from pygments.util import get_choice_opt
+
+
+__all__ = ['IRCFormatter']
+
+
+#: Map token types to a tuple of color values for light and dark
+#: backgrounds.
+IRC_COLORS = {
+    Token:              ('',            ''),
+
+    Whitespace:         ('lightgray',   'darkgray'),
+    Comment:            ('lightgray',   'darkgray'),
+    Comment.Preproc:    ('teal',        'turquoise'),
+    Keyword:            ('darkblue',    'blue'),
+    Keyword.Type:       ('teal',        'turquoise'),
+    Operator.Word:      ('purple',      'fuchsia'),
+    Name.Builtin:       ('teal',        'turquoise'),
+    Name.Function:      ('darkgreen',   'green'),
+    Name.Namespace:     ('_teal_',      '_turquoise_'),
+    Name.Class:         ('_darkgreen_', '_green_'),
+    Name.Exception:     ('teal',        'turquoise'),
+    Name.Decorator:     ('darkgray',    'lightgray'),
+    Name.Variable:      ('darkred',     'red'),
+    Name.Constant:      ('darkred',     'red'),
+    Name.Attribute:     ('teal',        'turquoise'),
+    Name.Tag:           ('blue',        'blue'),
+    String:             ('brown',       'brown'),
+    Number:             ('darkblue',    'blue'),
+
+    Generic.Deleted:    ('red',        'red'),
+    Generic.Inserted:   ('darkgreen',  'green'),
+    Generic.Heading:    ('**',         '**'),
+    Generic.Subheading: ('*purple*',   '*fuchsia*'),
+    Generic.Error:      ('red',        'red'),
+
+    Error:              ('_red_',      '_red_'),
+}
+
+
+IRC_COLOR_MAP = {
+    'white': 0,
+    'black': 1,
+    'darkblue': 2,
+    'green': 3,
+    'red': 4,
+    'brown': 5,
+    'purple': 6,
+    'orange': 7,
+    'darkgreen': 7, #compat w/ ansi
+    'yellow': 8,
+    'lightgreen': 9,
+    'turquoise': 9, # compat w/ ansi
+    'teal': 10,
+    'lightblue': 11,
+    'darkred': 11, # compat w/ ansi
+    'blue': 12,
+    'fuchsia': 13,
+    'darkgray': 14,
+    'lightgray': 15,
+}
+
+def ircformat(color, text):
+    if len(color) < 1:
+        return text
+    add = sub = ''
+    if '_' in color: # italic
+        add += '\x1D'
+        sub = '\x1D' + sub
+        color = color.strip('_')
+    if '*' in color: # bold
+        add += '\x02'
+        sub = '\x02' + sub
+        color = color.strip('*')
+    # underline (\x1F) not supported
+    # backgrounds (\x03FF,BB) not supported
+    if len(color) > 0: # actual color - may have issues with ircformat("red", "blah")+"10" type stuff
+        add += '\x03' + str(IRC_COLOR_MAP[color]).zfill(2)
+        sub = '\x03' + sub
+    return add + text + sub
+    return '<'+add+'>'+text+'</'+sub+'>'
+
+
+class IRCFormatter(Formatter):
+    r"""
+    Format tokens with IRC color sequences
+
+    The `get_style_defs()` method doesn't do anything special since there is
+    no support for common styles.
+
+    Options accepted:
+
+    `bg`
+        Set to ``"light"`` or ``"dark"`` depending on the terminal's background
+        (default: ``"light"``).
+
+    `colorscheme`
+        A dictionary mapping token types to (lightbg, darkbg) color names or
+        ``None`` (default: ``None`` = use builtin colorscheme).
+
+    `linenos`
+        Set to ``True`` to have line numbers in the output as well
+        (default: ``False`` = no line numbers).
+    """
+    name = 'IRC'
+    aliases = ['irc', 'IRC']
+    filenames = []
+
+    def __init__(self, **options):
+        Formatter.__init__(self, **options)
+        self.darkbg = get_choice_opt(options, 'bg',
+                                     ['light', 'dark'], 'light') == 'dark'
+        self.colorscheme = options.get('colorscheme', None) or IRC_COLORS
+        self.linenos = options.get('linenos', False)
+        self._lineno = 0
+
+    def _write_lineno(self, outfile):
+        self._lineno += 1
+        outfile.write("\n%04d: " % self._lineno)
+
+    def _format_unencoded_with_lineno(self, tokensource, outfile):
+        self._write_lineno(outfile)
+
+        for ttype, value in tokensource:
+            if value.endswith("\n"):
+                self._write_lineno(outfile)
+                value = value[:-1]
+            color = self.colorscheme.get(ttype)
+            while color is None:
+                ttype = ttype[:-1]
+                color = self.colorscheme.get(ttype)
+            if color:
+                color = color[self.darkbg]
+                spl = value.split('\n')
+                for line in spl[:-1]:
+                    self._write_lineno(outfile)
+                    if line:
+                        outfile.write(ircformat(color, line[:-1]))
+                if spl[-1]:
+                    outfile.write(ircformat(color, spl[-1]))
+            else:
+                outfile.write(value)
+
+        outfile.write("\n")
+
+    def format_unencoded(self, tokensource, outfile):
+        if self.linenos:
+            self._format_unencoded_with_lineno(tokensource, outfile)
+            return
+
+        for ttype, value in tokensource:
+            color = self.colorscheme.get(ttype)
+            while color is None:
+                ttype = ttype[:-1]
+                color = self.colorscheme.get(ttype)
+            if color:
+                color = color[self.darkbg]
+                spl = value.split('\n')
+                for line in spl[:-1]:
+                    if line:
+                        outfile.write(ircformat(color, line))
+                    outfile.write('\n')
+                if spl[-1]:
+                    outfile.write(ircformat(color, spl[-1]))
+            else:
+                outfile.write(value)