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pystache_custom
Commit 8fb76bb2 by Carl Whittaker
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First test passing with {{ }}

parent bb549161
Showing with 52 additions and 220 deletions
pystache/template.py
......@@ -17,138 +17,61 @@ def modifier(symbol):
return func
return set_modifier
def get_or_attr(obj, name, default=None):
try:
return obj[name]
except KeyError:
return default
except:
try:
return getattr(obj, name)
except AttributeError:
return default
class Template(object):
# The regular expression used to find a #section
section_re = None
# The regular expression used to find a tag.
tag_re = None
# Opening tag delimiter
otag = '{{'
# Closing tag delimiter
ctag = '}}'
def __init__(self, template, context=None):
def __init__(self, template=None, context=None, **kwargs):
from view import View
self.template = template
self.context = context or {}
self.compile_regexps()
def render(self, template=None, context=None, encoding=None):
"""Turns a Mustache template into something wonderful."""
template = template or self.template
context = context or self.context
template = self.render_sections(template, context)
result = self.render_tags(template, context)
if encoding is not None:
result = result.encode(encoding)
return result
def compile_regexps(self):
"""Compiles our section and tag regular expressions."""
tags = { 'otag': re.escape(self.otag), 'ctag': re.escape(self.ctag) }
section = r"%(otag)s[\#|^]([^\}]*)%(ctag)s\s*(.+?)\s*%(otag)s/\1%(ctag)s"
self.section_re = re.compile(section % tags, re.M|re.S)
if kwargs:
context.update(kwargs)
self.view = context if isinstance(context, View) else View(context=context)
self._compile_regexps()
def _compile_regexps(self):
tags = {
'otag': re.escape(self.otag),
'ctag': re.escape(self.ctag)
}
tag = r"%(otag)s(#|=|&|!|>|\{)?(.+?)\1?%(ctag)s+"
self.tag_re = re.compile(tag % tags)
def render_sections(self, template, context):
"""Expands sections."""
while 1:
match = self.section_re.search(template)
if match is None:
break
section, section_name, inner = match.group(0, 1, 2)
section_name = section_name.strip()
it = get_or_attr(context, section_name, None)
replacer = ''
if it and isinstance(it, collections.Callable):
replacer = it(inner)
elif it and not hasattr(it, '__iter__'):
if section[2] != '^':
replacer = inner
elif it and hasattr(it, 'keys') and hasattr(it, '__getitem__'):
if section[2] != '^':
replacer = self.render(inner, it)
elif it:
insides = []
for item in it:
insides.append(self.render(inner, item))
replacer = ''.join(insides)
elif not it and section[2] == '^':
replacer = inner
template = template.replace(section, replacer)
def _render_sections(self, template, view):
return template
def render_tags(self, template, context):
"""Renders all the tags in a template for a context."""
while 1:
def _render_tags(self, template, view):
while True:
match = self.tag_re.search(template)
if match is None:
break
tag, tag_type, tag_name = match.group(0, 1, 2)
tag_name = tag_name.strip()
func = modifiers[tag_type]
replacement = func(self, tag_name, context)
replacement = func(self, tag_name, view)
template = template.replace(tag, replacement)
return template
@modifier(None)
def render_tag(self, tag_name, context):
"""Given a tag name and context, finds, escapes, and renders the tag."""
raw = get_or_attr(context, tag_name, '')
if not raw and raw is not 0:
return ''
def _render_tag(self, tag_name, view):
raw = view.get(tag_name, '')
return cgi.escape(unicode(raw))
@modifier('!')
def render_comment(self, tag_name=None, context=None):
"""Rendering a comment always returns nothing."""
return ''
@modifier('{')
@modifier('&')
def render_unescaped(self, tag_name=None, context=None):
"""Render a tag without escaping it."""
return unicode(get_or_attr(context, tag_name, ''))
@modifier('>')
def render_partial(self, tag_name=None, context=None):
"""Renders a partial within the current context."""
# Import view here to avoid import loop
from pystache.view import View
view = View(context=context)
view.template_name = tag_name
return view.render()
@modifier('=')
def render_delimiter(self, tag_name=None, context=None):
"""Changes the Mustache delimiter."""
self.otag, self.ctag = tag_name.split(' ')
self.compile_regexps()
return ''
def render(self):
template = self._render_sections(self.template, self.view)
result = self._render_tags(template, self.view)
return result
\ No newline at end of file
pystache/view.py
......@@ -4,114 +4,11 @@ import re
from types import *
class View(object):
# Path where this view's template(s) live
template_path = '.'
# Extension for templates
template_extension = 'mustache'
# The name of this template. If none is given the View will try
# to infer it based on the class name.
template_name = None
# Absolute path to the template itself. Pystache will try to guess
# if it's not provided.
template_file = None
# Contents of the template.
template = None
# Character encoding of the template file. If None, Pystache will not
# do any decoding of the template.
template_encoding = None
def __init__(self, template=None, context=None, **kwargs):
self.template = template
self.context = context or {}
# If the context we're handed is a View, we want to inherit
# its settings.
if isinstance(context, View):
self.inherit_settings(context)
if kwargs:
self.context.update(kwargs)
def inherit_settings(self, view):
"""Given another View, copies its settings."""
if view.template_path:
self.template_path = view.template_path
if view.template_name:
self.template_name = view.template_name
def load_template(self):
if self.template:
return self.template
if self.template_file:
return self._load_template()
name = self.get_template_name() + '.' + self.template_extension
if isinstance(self.template_path, basestring):
self.template_file = os.path.join(self.template_path, name)
return self._load_template()
self.context.update(**kwargs)
for path in self.template_path:
self.template_file = os.path.join(path, name)
if os.path.exists(self.template_file):
return self._load_template()
raise IOError('"%s" not found in "%s"' % (name, ':'.join(self.template_path),))
def _load_template(self):
f = open(self.template_file, 'r')
try:
template = f.read()
if self.template_encoding:
template = unicode(template, self.template_encoding)
finally:
f.close()
return template
def get_template_name(self, name=None):
"""TemplatePartial => template_partial
Takes a string but defaults to using the current class' name or
the `template_name` attribute
"""
if self.template_name:
return self.template_name
if not name:
name = self.__class__.__name__
def repl(match):
return '_' + match.group(0).lower()
return re.sub('[A-Z]', repl, name)[1:]
def __contains__(self, needle):
return needle in self.context or hasattr(self, needle)
def __getitem__(self, attr):
val = self.get(attr, None)
if not val:
raise KeyError("No such key.")
return val
def get(self, attr, default):
attr = self.context.get(attr, getattr(self, attr, default))
if hasattr(attr, '__call__') and type(attr) is UnboundMethodType:
return attr()
else:
return attr
def render(self, encoding=None):
template = self.load_template()
return Template(template, self).render(encoding=encoding)
def __str__(self):
return self.render()
def get(self, attr, default=None):
return self.context.get(attr, getattr(self, attr, default))
\ No newline at end of file
tests/test_simple.py 0 → 100644
import unittest
import pystache
class TestSimple(unittest.TestCase):
def test_simple_render(self):
tmpl = '{{derp}}'
self.assertEqual('herp', pystache.Template(tmpl, {'derp': 'herp'}).render())
\ No newline at end of file
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