# -*- coding: utf-8 -*-
import collections
import cStringIO
import datetime
import hashlib
import json
import itertools
import logging
import math
import os
import re
import sys
import textwrap
import uuid
from subprocess import Popen, PIPE
from urlparse import urlparse

import babel
import babel.dates
import werkzeug
from lxml import etree, html
from PIL import Image
import psycopg2

import openerp.http
import openerp.tools
from openerp.tools.func import lazy_property
import openerp.tools.lru
from openerp.http import request
from openerp.tools.safe_eval import safe_eval as eval
from openerp.osv import osv, orm, fields
from openerp.tools import html_escape as escape
from openerp.tools.translate import _

_logger = logging.getLogger(__name__)

MAX_CSS_RULES = 4095

#--------------------------------------------------------------------
# QWeb template engine
#--------------------------------------------------------------------
class QWebException(Exception):
    def __init__(self, message, **kw):
        Exception.__init__(self, message)
        self.qweb = dict(kw)
    def pretty_xml(self):
        if 'node' not in self.qweb:
            return ''
        return etree.tostring(self.qweb['node'], pretty_print=True)

class QWebTemplateNotFound(QWebException):
    pass

def raise_qweb_exception(etype=None, **kw):
    if etype is None:
        etype = QWebException
    orig_type, original, tb = sys.exc_info()
    try:
        raise etype, original, tb
    except etype, e:
        for k, v in kw.items():
            e.qweb[k] = v
        # Will use `raise foo from bar` in python 3 and rename cause to __cause__
        e.qweb['cause'] = original
        raise

def _build_attribute(name, value):
    value = escape(value)
    if isinstance(name, unicode): name = name.encode('utf-8')
    if isinstance(value, unicode): value = value.encode('utf-8')
    return ' %s="%s"' % (name, value)

class QWebContext(dict):
    def __init__(self, cr, uid, data, loader=None, templates=None, context=None):
        self.cr = cr
        self.uid = uid
        self.loader = loader
        self.templates = templates or {}
        self.context = context
        dic = dict(data)
        super(QWebContext, self).__init__(dic)
        self['defined'] = lambda key: key in self

    def safe_eval(self, expr):
        locals_dict = collections.defaultdict(lambda: None)
        locals_dict.update(self)
        locals_dict.pop('cr', None)
        locals_dict.pop('loader', None)
        return eval(expr, None, locals_dict, nocopy=True, locals_builtins=True)

    def copy(self):
        """ Clones the current context, conserving all data and metadata
        (loader, template cache, ...)
        """
        return QWebContext(self.cr, self.uid, dict.copy(self),
                           loader=self.loader,
                           templates=self.templates,
                           context=self.context)

    def __copy__(self):
        return self.copy()

class QWeb(orm.AbstractModel):
    """ Base QWeb rendering engine

    * to customize ``t-field`` rendering, subclass ``ir.qweb.field`` and
      create new models called :samp:`ir.qweb.field.{widget}`
    * alternatively, override :meth:`~.get_converter_for` and return an
      arbitrary model to use as field converter

    Beware that if you need extensions or alterations which could be
    incompatible with other subsystems, you should create a local object
    inheriting from ``ir.qweb`` and customize that.
    """

    _name = 'ir.qweb'

    _void_elements = frozenset([
        u'area', u'base', u'br', u'col', u'embed', u'hr', u'img', u'input',
        u'keygen', u'link', u'menuitem', u'meta', u'param', u'source',
        u'track', u'wbr'])
    _format_regex = re.compile(
        '(?:'
            # ruby-style pattern
            '#\{(.+?)\}'
        ')|(?:'
            # jinja-style pattern
            '\{\{(.+?)\}\}'
        ')')

    def __init__(self, pool, cr):
        super(QWeb, self).__init__(pool, cr)

        self._render_tag = self.prefixed_methods('render_tag_')
        self._render_att = self.prefixed_methods('render_att_')

    def prefixed_methods(self, prefix):
        """ Extracts all methods prefixed by ``prefix``, and returns a mapping
        of (t-name, method) where the t-name is the method name with prefix
        removed and underscore converted to dashes

        :param str prefix:
        :return: dict
        """
        n_prefix = len(prefix)
        return dict(
            (name[n_prefix:].replace('_', '-'), getattr(type(self), name))
            for name in dir(self)
            if name.startswith(prefix)
        )

    def register_tag(self, tag, func):
        self._render_tag[tag] = func

    def add_template(self, qwebcontext, name, node):
        """Add a parsed template in the context. Used to preprocess templates."""
        qwebcontext.templates[name] = node

    def load_document(self, document, res_id, qwebcontext):
        """
        Loads an XML document and installs any contained template in the engine

        :type document: a parsed lxml.etree element, an unparsed XML document
                        (as a string) or the path of an XML file to load
        """
        if not isinstance(document, basestring):
            # assume lxml.etree.Element
            dom = document
        elif document.startswith("<?xml"):
            dom = etree.fromstring(document)
        else:
            dom = etree.parse(document).getroot()

        for node in dom:
            if node.get('t-name'):
                name = str(node.get("t-name"))
                self.add_template(qwebcontext, name, node)
            if res_id and node.tag == "t":
                self.add_template(qwebcontext, res_id, node)
                res_id = None

    def get_template(self, name, qwebcontext):
        """ Tries to fetch the template ``name``, either gets it from the
        context's template cache or loads one with the context's loader (if
        any).

        :raises QWebTemplateNotFound: if the template can not be found or loaded
        """
        origin_template = qwebcontext.get('__caller__') or qwebcontext['__stack__'][0]
        if qwebcontext.loader and name not in qwebcontext.templates:
            try:
                xml_doc = qwebcontext.loader(name)
            except ValueError:
                raise_qweb_exception(QWebTemplateNotFound, message="Loader could not find template %r" % name, template=origin_template)
            self.load_document(xml_doc, isinstance(name, (int, long)) and name or None, qwebcontext=qwebcontext)

        if name in qwebcontext.templates:
            return qwebcontext.templates[name]

        raise QWebTemplateNotFound("Template %r not found" % name, template=origin_template)

    def eval(self, expr, qwebcontext):
        try:
            return qwebcontext.safe_eval(expr)
        except Exception:
            template = qwebcontext.get('__template__')
            raise_qweb_exception(message="Could not evaluate expression %r" % expr, expression=expr, template=template)

    def eval_object(self, expr, qwebcontext):
        return self.eval(expr, qwebcontext)

    def eval_str(self, expr, qwebcontext):
        if expr == "0":
            return qwebcontext.get(0, '')
        val = self.eval(expr, qwebcontext)
        if isinstance(val, unicode):
            return val.encode("utf8")
        if val is False or val is None:
            return ''
        return str(val)

    def eval_format(self, expr, qwebcontext):
        expr, replacements = self._format_regex.subn(
            lambda m: self.eval_str(m.group(1) or m.group(2), qwebcontext),
            expr
        )

        if replacements:
            return expr

        try:
            return str(expr % qwebcontext)
        except Exception:
            template = qwebcontext.get('__template__')
            raise_qweb_exception(message="Format error for expression %r" % expr, expression=expr, template=template)

    def eval_bool(self, expr, qwebcontext):
        return int(bool(self.eval(expr, qwebcontext)))

    def render(self, cr, uid, id_or_xml_id, qwebcontext=None, loader=None, context=None):
        """ render(cr, uid, id_or_xml_id, qwebcontext=None, loader=None, context=None)

        Renders the template specified by the provided template name

        :param qwebcontext: context for rendering the template
        :type qwebcontext: dict or :class:`QWebContext` instance
        :param loader: if ``qwebcontext`` is a dict, loader set into the
                       context instantiated for rendering
        """
        if qwebcontext is None:
            qwebcontext = {}

        if not isinstance(qwebcontext, QWebContext):
            qwebcontext = QWebContext(cr, uid, qwebcontext, loader=loader, context=context)

        qwebcontext['__template__'] = id_or_xml_id
        stack = qwebcontext.get('__stack__', [])
        if stack:
            qwebcontext['__caller__'] = stack[-1]
        stack.append(id_or_xml_id)
        qwebcontext['__stack__'] = stack
        qwebcontext['xmlid'] = str(stack[0]) # Temporary fix
        return self.render_node(self.get_template(id_or_xml_id, qwebcontext), qwebcontext)

    def render_node(self, element, qwebcontext):
        generated_attributes = ""
        t_render = None
        template_attributes = {}
        for (attribute_name, attribute_value) in element.attrib.iteritems():
            attribute_name = unicode(attribute_name)
            if attribute_name == "groups":
                cr = qwebcontext.get('request') and qwebcontext['request'].cr or None
                uid = qwebcontext.get('request') and qwebcontext['request'].uid or None
                can_see = self.user_has_groups(cr, uid, groups=attribute_value) if cr and uid else False
                if not can_see:
                    return ''

            attribute_value = attribute_value.encode("utf8")

            if attribute_name.startswith("t-"):
                for attribute in self._render_att:
                    if attribute_name[2:].startswith(attribute):
                        attrs = self._render_att[attribute](
                            self, element, attribute_name, attribute_value, qwebcontext)
                        for att, val in attrs:
                            if not val: continue
                            generated_attributes += self.render_attribute(element, att, val, qwebcontext)
                        break
                else:
                    if attribute_name[2:] in self._render_tag:
                        t_render = attribute_name[2:]
                    template_attributes[attribute_name[2:]] = attribute_value
            else:
                generated_attributes += self.render_attribute(element, attribute_name, attribute_value, qwebcontext)

        if 'debug' in template_attributes:
            debugger = template_attributes.get('debug', 'pdb')
            __import__(debugger).set_trace()  # pdb, ipdb, pudb, ...
        if t_render:
            result = self._render_tag[t_render](self, element, template_attributes, generated_attributes, qwebcontext)
        else:
            result = self.render_element(element, template_attributes, generated_attributes, qwebcontext)

        if element.tail:
            result += element.tail.encode('utf-8')

        if isinstance(result, unicode):
            return result.encode('utf-8')
        return result

    def render_element(self, element, template_attributes, generated_attributes, qwebcontext, inner=None):
        # element: element
        # template_attributes: t-* attributes
        # generated_attributes: generated attributes
        # qwebcontext: values
        # inner: optional innerXml
        if inner:
            g_inner = inner.encode('utf-8') if isinstance(inner, unicode) else inner
        else:
            g_inner = [] if element.text is None else [element.text.encode('utf-8')]
            for current_node in element.iterchildren(tag=etree.Element):
                try:
                    g_inner.append(self.render_node(current_node, qwebcontext))
                except QWebException:
                    raise
                except Exception:
                    template = qwebcontext.get('__template__')
                    raise_qweb_exception(message="Could not render element %r" % element.tag, node=element, template=template)
        name = unicode(element.tag)
        inner = "".join(g_inner)
        trim = template_attributes.get("trim", 0)
        if trim == 0:
            pass
        elif trim == 'left':
            inner = inner.lstrip()
        elif trim == 'right':
            inner = inner.rstrip()
        elif trim == 'both':
            inner = inner.strip()
        if name == "t":
            return inner
        elif len(inner) or name not in self._void_elements:
            return "<%s%s>%s</%s>" % tuple(
                qwebcontext if isinstance(qwebcontext, str) else qwebcontext.encode('utf-8')
                for qwebcontext in (name, generated_attributes, inner, name)
            )
        else:
            return "<%s%s/>" % (name.encode("utf-8"), generated_attributes)

    def render_attribute(self, element, name, value, qwebcontext):
        return _build_attribute(name, value)

    # Attributes
    def render_att_att(self, element, attribute_name, attribute_value, qwebcontext):
        if attribute_name.startswith("t-attf-"):
            return [(attribute_name[7:], self.eval_format(attribute_value, qwebcontext))]

        if attribute_name.startswith("t-att-"):
            return [(attribute_name[6:], self.eval(attribute_value, qwebcontext))]

        result = self.eval_object(attribute_value, qwebcontext)
        if isinstance(result, collections.Mapping):
            return result.iteritems()
        # assume tuple
        return [result]

    # Tags
    def render_tag_raw(self, element, template_attributes, generated_attributes, qwebcontext):
        inner = self.eval_str(template_attributes["raw"], qwebcontext)
        return self.render_element(element, template_attributes, generated_attributes, qwebcontext, inner)

    def render_tag_esc(self, element, template_attributes, generated_attributes, qwebcontext):
        options = json.loads(template_attributes.get('esc-options') or '{}')
        widget = self.get_widget_for(options.get('widget'))
        inner = widget.format(template_attributes['esc'], options, qwebcontext)
        return self.render_element(element, template_attributes, generated_attributes, qwebcontext, inner)

    def _iterate(self, iterable):
        if isinstance (iterable, collections.Mapping):
            return iterable.iteritems()

        return itertools.izip(*itertools.tee(iterable))

    def render_tag_foreach(self, element, template_attributes, generated_attributes, qwebcontext):
        expr = template_attributes["foreach"]
        enum = self.eval_object(expr, qwebcontext)
        if enum is None:
            template = qwebcontext.get('__template__')
            raise QWebException("foreach enumerator %r is not defined while rendering template %r" % (expr, template), template=template)
        if isinstance(enum, int):
            enum = range(enum)

        varname = template_attributes['as'].replace('.', '_')
        copy_qwebcontext = qwebcontext.copy()

        size = None
        if isinstance(enum, collections.Sized):
            size = len(enum)
            copy_qwebcontext["%s_size" % varname] = size

        copy_qwebcontext["%s_all" % varname] = enum
        ru = []
        for index, (item, value) in enumerate(self._iterate(enum)):
            copy_qwebcontext.update({
                varname: item,
                '%s_value' % varname: value,
                '%s_index' % varname: index,
                '%s_first' % varname: index == 0,
            })
            if size is not None:
                copy_qwebcontext['%s_last' % varname] = index + 1 == size
            if index % 2:
                copy_qwebcontext.update({
                    '%s_parity' % varname: 'odd',
                    '%s_even' % varname: False,
                    '%s_odd' % varname: True,
                })
            else:
                copy_qwebcontext.update({
                    '%s_parity' % varname: 'even',
                    '%s_even' % varname: True,
                    '%s_odd' % varname: False,
                })
            ru.append(self.render_element(element, template_attributes, generated_attributes, copy_qwebcontext))

        for k in qwebcontext.keys():
            qwebcontext[k] = copy_qwebcontext[k]

        return "".join(ru)

    def render_tag_if(self, element, template_attributes, generated_attributes, qwebcontext):
        if self.eval_bool(template_attributes["if"], qwebcontext):
            return self.render_element(element, template_attributes, generated_attributes, qwebcontext)
        return ""

    def render_tag_call(self, element, template_attributes, generated_attributes, qwebcontext):
        d = qwebcontext.copy()
        d[0] = self.render_element(element, template_attributes, generated_attributes, d)
        cr = d.get('request') and d['request'].cr or None
        uid = d.get('request') and d['request'].uid or None

        template = self.eval_format(template_attributes["call"], d)
        try:
            template = int(template)
        except ValueError:
            pass
        return self.render(cr, uid, template, d)

    def render_tag_call_assets(self, element, template_attributes, generated_attributes, qwebcontext):
        """ This special 't-call' tag can be used in order to aggregate/minify javascript and css assets"""
        if len(element):
            # An asset bundle is rendered in two differents contexts (when genereting html and
            # when generating the bundle itself) so they must be qwebcontext free
            # even '0' variable is forbidden
            template = qwebcontext.get('__template__')
            raise QWebException("t-call-assets cannot contain children nodes", template=template)
        xmlid = template_attributes['call-assets']
        cr, uid, context = [getattr(qwebcontext, attr) for attr in ('cr', 'uid', 'context')]
        bundle = AssetsBundle(xmlid, cr=cr, uid=uid, context=context, registry=self.pool)
        css = self.get_attr_bool(template_attributes.get('css'), default=True)
        js = self.get_attr_bool(template_attributes.get('js'), default=True)
        return bundle.to_html(css=css, js=js, debug=bool(qwebcontext.get('debug')))

    def render_tag_set(self, element, template_attributes, generated_attributes, qwebcontext):
        if "value" in template_attributes:
            qwebcontext[template_attributes["set"]] = self.eval_object(template_attributes["value"], qwebcontext)
        elif "valuef" in template_attributes:
            qwebcontext[template_attributes["set"]] = self.eval_format(template_attributes["valuef"], qwebcontext)
        else:
            qwebcontext[template_attributes["set"]] = self.render_element(element, template_attributes, generated_attributes, qwebcontext)
        return ""

    def render_tag_field(self, element, template_attributes, generated_attributes, qwebcontext):
        """ eg: <span t-record="browse_record(res.partner, 1)" t-field="phone">+1 555 555 8069</span>"""
        node_name = element.tag
        assert node_name not in ("table", "tbody", "thead", "tfoot", "tr", "td",
                                 "li", "ul", "ol", "dl", "dt", "dd"),\
            "RTE widgets do not work correctly on %r elements" % node_name
        assert node_name != 't',\
            "t-field can not be used on a t element, provide an actual HTML node"

        record, field_name = template_attributes["field"].rsplit('.', 1)
        record = self.eval_object(record, qwebcontext)

        field = record._fields[field_name]
        options = json.loads(template_attributes.get('field-options') or '{}')
        field_type = get_field_type(field, options)

        converter = self.get_converter_for(field_type)

        return converter.to_html(qwebcontext.cr, qwebcontext.uid, field_name, record, options,
                                 element, template_attributes, generated_attributes, qwebcontext, context=qwebcontext.context)

    def get_converter_for(self, field_type):
        """ returns a :class:`~openerp.models.Model` used to render a
        ``t-field``.

        By default, tries to get the model named
        :samp:`ir.qweb.field.{field_type}`, falling back on ``ir.qweb.field``.

        :param str field_type: type or widget of field to render
        """
        return self.pool.get('ir.qweb.field.' + field_type, self.pool['ir.qweb.field'])

    def get_widget_for(self, widget):
        """ returns a :class:`~openerp.models.Model` used to render a
        ``t-esc``

        :param str widget: name of the widget to use, or ``None``
        """
        widget_model = ('ir.qweb.widget.' + widget) if widget else 'ir.qweb.widget'
        return self.pool.get(widget_model) or self.pool['ir.qweb.widget']

    def get_attr_bool(self, attr, default=False):
        if attr:
            attr = attr.lower()
            if attr in ('false', '0'):
                return False
            elif attr in ('true', '1'):
                return True
        return default

#--------------------------------------------------------------------
# QWeb Fields converters
#--------------------------------------------------------------------

class FieldConverter(osv.AbstractModel):
    """ Used to convert a t-field specification into an output HTML field.

    :meth:`~.to_html` is the entry point of this conversion from QWeb, it:

    * converts the record value to html using :meth:`~.record_to_html`
    * generates the metadata attributes (``data-oe-``) to set on the root
      result node
    * generates the root result node itself through :meth:`~.render_element`
    """
    _name = 'ir.qweb.field'

    def attributes(self, cr, uid, field_name, record, options,
                   source_element, g_att, t_att, qweb_context,
                   context=None):
        """ attributes(cr, uid, field_name, record, options, source_element, g_att, t_att, qweb_context, context=None)

        Generates the metadata attributes (prefixed by ``data-oe-`` for the
        root node of the field conversion. Attribute values are escaped by the
        parent.

        The default attributes are:

        * ``model``, the name of the record's model
        * ``id`` the id of the record to which the field belongs
        * ``field`` the name of the converted field
        * ``type`` the logical field type (widget, may not match the field's
          ``type``, may not be any Field subclass name)
        * ``translate``, a boolean flag (``0`` or ``1``) denoting whether the
          field is translatable
        * ``expression``, the original expression

        :returns: iterable of (attribute name, attribute value) pairs.
        """
        field = record._fields[field_name]
        field_type = get_field_type(field, options)
        return [
            ('data-oe-model', record._name),
            ('data-oe-id', record.id),
            ('data-oe-field', field_name),
            ('data-oe-type', field_type),
            ('data-oe-expression', t_att['field']),
        ]

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        """ value_to_html(cr, uid, value, field, options=None, context=None)

        Converts a single value to its HTML version/output
        """
        if not value: return ''
        return value

    def record_to_html(self, cr, uid, field_name, record, options=None, context=None):
        """ record_to_html(cr, uid, field_name, record, options=None, context=None)

        Converts the specified field of the browse_record ``record`` to HTML
        """
        field = record._fields[field_name]
        return self.value_to_html(
            cr, uid, record[field_name], field, options=options, context=context)

    def to_html(self, cr, uid, field_name, record, options,
                source_element, t_att, g_att, qweb_context, context=None):
        """ to_html(cr, uid, field_name, record, options, source_element, t_att, g_att, qweb_context, context=None)

        Converts a ``t-field`` to its HTML output. A ``t-field`` may be
        extended by a ``t-field-options``, which is a JSON-serialized mapping
        of configuration values.

        A default configuration key is ``widget`` which can override the
        field's own ``_type``.
        """
        try:
            content = self.record_to_html(cr, uid, field_name, record, options, context=context)
            if options.get('html-escape', True):
                content = escape(content)
            elif hasattr(content, '__html__'):
                content = content.__html__()
        except Exception:
            _logger.warning("Could not get field %s for model %s",
                            field_name, record._name, exc_info=True)
            content = None

        inherit_branding = context and context.get('inherit_branding')
        if not inherit_branding and context and context.get('inherit_branding_auto'):
            inherit_branding = self.pool['ir.model.access'].check(cr, uid, record._name, 'write', False, context=context)

        if inherit_branding:
            # add branding attributes
            g_att += ''.join(
                _build_attribute(name, value)
                for name, value in self.attributes(
                    cr, uid, field_name, record, options,
                    source_element, g_att, t_att, qweb_context, context=context)
            )

        return self.render_element(cr, uid, source_element, t_att, g_att,
                                   qweb_context, content)

    def qweb_object(self):
        return self.pool['ir.qweb']

    def render_element(self, cr, uid, source_element, t_att, g_att,
                       qweb_context, content):
        """ render_element(cr, uid, source_element, t_att, g_att, qweb_context, content)

        Final rendering hook, by default just calls ir.qweb's ``render_element``
        """
        return self.qweb_object().render_element(
            source_element, t_att, g_att, qweb_context, content or '')

    def user_lang(self, cr, uid, context):
        """ user_lang(cr, uid, context)

        Fetches the res.lang object corresponding to the language code stored
        in the user's context. Fallbacks to en_US if no lang is present in the
        context *or the language code is not valid*.

        :returns: res.lang browse_record
        """
        if context is None: context = {}

        lang_code = context.get('lang') or 'en_US'
        Lang = self.pool['res.lang']

        lang_ids = Lang.search(cr, uid, [('code', '=', lang_code)], context=context) \
               or  Lang.search(cr, uid, [('code', '=', 'en_US')], context=context)

        return Lang.browse(cr, uid, lang_ids[0], context=context)

class FloatConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.float'
    _inherit = 'ir.qweb.field'

    def precision(self, cr, uid, field, options=None, context=None):
        _, precision = field.digits or (None, None)
        return precision

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        if context is None:
            context = {}
        precision = self.precision(cr, uid, field, options=options, context=context)
        fmt = '%f' if precision is None else '%.{precision}f'

        lang_code = context.get('lang') or 'en_US'
        lang = self.pool['res.lang']
        formatted = lang.format(cr, uid, [lang_code], fmt.format(precision=precision), value, grouping=True)

        # %f does not strip trailing zeroes. %g does but its precision causes
        # it to switch to scientific notation starting at a million *and* to
        # strip decimals. So use %f and if no precision was specified manually
        # strip trailing 0.
        if precision is None:
            formatted = re.sub(r'(?:(0|\d+?)0+)$', r'\1', formatted)
        return formatted

class DateConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.date'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        if not value or len(value)<10: return ''
        lang = self.user_lang(cr, uid, context=context)
        locale = babel.Locale.parse(lang.code)

        if isinstance(value, basestring):
            value = datetime.datetime.strptime(
                value[:10], openerp.tools.DEFAULT_SERVER_DATE_FORMAT)

        if options and 'format' in options:
            pattern = options['format']
        else:
            strftime_pattern = lang.date_format
            pattern = openerp.tools.posix_to_ldml(strftime_pattern, locale=locale)

        return babel.dates.format_date(
            value, format=pattern,
            locale=locale)

class DateTimeConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.datetime'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        if not value: return ''
        lang = self.user_lang(cr, uid, context=context)
        locale = babel.Locale.parse(lang.code)

        if isinstance(value, basestring):
            value = datetime.datetime.strptime(
                value, openerp.tools.DEFAULT_SERVER_DATETIME_FORMAT)
        value = fields.datetime.context_timestamp(
            cr, uid, timestamp=value, context=context)

        if options and 'format' in options:
            pattern = options['format']
        else:
            strftime_pattern = (u"%s %s" % (lang.date_format, lang.time_format))
            pattern = openerp.tools.posix_to_ldml(strftime_pattern, locale=locale)

        if options and options.get('hide_seconds'):
            pattern = pattern.replace(":ss", "").replace(":s", "")

        return babel.dates.format_datetime(value, format=pattern, locale=locale)

class TextConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.text'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        """
        Escapes the value and converts newlines to br. This is bullshit.
        """
        if not value: return ''

        return nl2br(value, options=options)

class SelectionConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.selection'
    _inherit = 'ir.qweb.field'

    def record_to_html(self, cr, uid, field_name, record, options=None, context=None):
        value = record[field_name]
        if not value: return ''
        field = record._fields[field_name]
        selection = dict(field.get_description(record.env)['selection'])
        return self.value_to_html(
            cr, uid, selection[value], field, options=options)

class ManyToOneConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.many2one'
    _inherit = 'ir.qweb.field'

    def record_to_html(self, cr, uid, field_name, record, options=None, context=None):
        [read] = record.read([field_name])
        if not read[field_name]: return ''
        _, value = read[field_name]
        return nl2br(value, options=options)

class HTMLConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.html'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        return HTMLSafe(value or '')

class ImageConverter(osv.AbstractModel):
    """ ``image`` widget rendering, inserts a data:uri-using image tag in the
    document. May be overridden by e.g. the website module to generate links
    instead.

    .. todo:: what happens if different output need different converters? e.g.
              reports may need embedded images or FS links whereas website
              needs website-aware
    """
    _name = 'ir.qweb.field.image'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        try:
            image = Image.open(cStringIO.StringIO(value.decode('base64')))
            image.verify()
        except IOError:
            raise ValueError("Non-image binary fields can not be converted to HTML")
        except: # image.verify() throws "suitable exceptions", I have no idea what they are
            raise ValueError("Invalid image content")

        return HTMLSafe('<img src="data:%s;base64,%s">' % (Image.MIME[image.format], value))

class MonetaryConverter(osv.AbstractModel):
    """ ``monetary`` converter, has a mandatory option
    ``display_currency``.

    The currency is used for formatting *and rounding* of the float value. It
    is assumed that the linked res_currency has a non-empty rounding value and
    res.currency's ``round`` method is used to perform rounding.

    .. note:: the monetary converter internally adds the qweb context to its
              options mapping, so that the context is available to callees.
              It's set under the ``_qweb_context`` key.
    """
    _name = 'ir.qweb.field.monetary'
    _inherit = 'ir.qweb.field'

    def to_html(self, cr, uid, field_name, record, options,
                source_element, t_att, g_att, qweb_context, context=None):
        options['_qweb_context'] = qweb_context
        return super(MonetaryConverter, self).to_html(
            cr, uid, field_name, record, options,
            source_element, t_att, g_att, qweb_context, context=context)

    def record_to_html(self, cr, uid, field_name, record, options, context=None):
        if context is None:
            context = {}
        Currency = self.pool['res.currency']
        display_currency = self.display_currency(cr, uid, options['display_currency'], options)

        # lang.format mandates a sprintf-style format. These formats are non-
        # minimal (they have a default fixed precision instead), and
        # lang.format will not set one by default. currency.round will not
        # provide one either. So we need to generate a precision value
        # (integer > 0) from the currency's rounding (a float generally < 1.0).
        #
        # The log10 of the rounding should be the number of digits involved if
        # negative, if positive clamp to 0 digits and call it a day.
        # nb: int() ~ floor(), we want nearest rounding instead
        precision = int(math.floor(math.log10(display_currency.rounding)))
        fmt = "%.{0}f".format(-precision if precision < 0 else 0)

        from_amount = record[field_name]

        if options.get('from_currency'):
            from_currency = self.display_currency(cr, uid, options['from_currency'], options)
            from_amount = Currency.compute(cr, uid, from_currency.id, display_currency.id, from_amount)

        lang_code = context.get('lang') or 'en_US'
        lang = self.pool['res.lang']
        formatted_amount = lang.format(cr, uid, [lang_code],
            fmt, Currency.round(cr, uid, display_currency, from_amount),
            grouping=True, monetary=True)

        pre = post = u''
        if display_currency.position == 'before':
            pre = u'{symbol}\N{NO-BREAK SPACE}'
        else:
            post = u'\N{NO-BREAK SPACE}{symbol}'

        return HTMLSafe(u'{pre}<span class="oe_currency_value">{0}</span>{post}'.format(
            formatted_amount,
            pre=pre, post=post,
        ).format(
            symbol=display_currency.symbol,
        ))

    def display_currency(self, cr, uid, currency, options):
        return self.qweb_object().eval_object(
            currency, options['_qweb_context'])

TIMEDELTA_UNITS = (
    ('year',   3600 * 24 * 365),
    ('month',  3600 * 24 * 30),
    ('week',   3600 * 24 * 7),
    ('day',    3600 * 24),
    ('hour',   3600),
    ('minute', 60),
    ('second', 1)
)
class DurationConverter(osv.AbstractModel):
    """ ``duration`` converter, to display integral or fractional values as
    human-readable time spans (e.g. 1.5 as "1 hour 30 minutes").

    Can be used on any numerical field.

    Has a mandatory option ``unit`` which can be one of ``second``, ``minute``,
    ``hour``, ``day``, ``week`` or ``year``, used to interpret the numerical
    field value before converting it.

    Sub-second values will be ignored.
    """
    _name = 'ir.qweb.field.duration'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        units = dict(TIMEDELTA_UNITS)
        if value < 0:
            raise ValueError(_("Durations can't be negative"))
        if not options or options.get('unit') not in units:
            raise ValueError(_("A unit must be provided to duration widgets"))

        locale = babel.Locale.parse(
            self.user_lang(cr, uid, context=context).code)
        factor = units[options['unit']]

        sections = []
        r = value * factor
        for unit, secs_per_unit in TIMEDELTA_UNITS:
            v, r = divmod(r, secs_per_unit)
            if not v: continue
            section = babel.dates.format_timedelta(
                v*secs_per_unit, threshold=1, locale=locale)
            if section:
                sections.append(section)
        return ' '.join(sections)


class RelativeDatetimeConverter(osv.AbstractModel):
    _name = 'ir.qweb.field.relative'
    _inherit = 'ir.qweb.field'

    def value_to_html(self, cr, uid, value, field, options=None, context=None):
        parse_format = openerp.tools.DEFAULT_SERVER_DATETIME_FORMAT
        locale = babel.Locale.parse(
            self.user_lang(cr, uid, context=context).code)

        if isinstance(value, basestring):
            value = datetime.datetime.strptime(value, parse_format)

        # value should be a naive datetime in UTC. So is fields.Datetime.now()
        reference = datetime.datetime.strptime(field.now(), parse_format)

        return babel.dates.format_timedelta(
            value - reference, add_direction=True, locale=locale)

class Contact(orm.AbstractModel):
    _name = 'ir.qweb.field.contact'
    _inherit = 'ir.qweb.field.many2one'

    def record_to_html(self, cr, uid, field_name, record, options=None, context=None):
        if context is None:
            context = {}

        if options is None:
            options = {}
        opf = options.get('fields') or ["name", "address", "phone", "mobile", "fax", "email"]

        value_rec = record[field_name]
        if not value_rec:
            return None
        value_rec = value_rec.sudo().with_context(show_address=True)
        value = value_rec.name_get()[0][1]

        val = {
            'name': value.split("\n")[0],
            'address': escape("\n".join(value.split("\n")[1:])),
            'phone': value_rec.phone,
            'mobile': value_rec.mobile,
            'fax': value_rec.fax,
            'city': value_rec.city,
            'country_id': value_rec.country_id.display_name,
            'website': value_rec.website,
            'email': value_rec.email,
            'fields': opf,
            'object': value_rec,
            'options': options
        }

        html = self.pool["ir.ui.view"].render(cr, uid, "base.contact", val, engine='ir.qweb', context=context).decode('utf8')

        return HTMLSafe(html)

class QwebView(orm.AbstractModel):
    _name = 'ir.qweb.field.qweb'
    _inherit = 'ir.qweb.field.many2one'

    def record_to_html(self, cr, uid, field_name, record, options=None, context=None):
        if not getattr(record, field_name):
            return None

        view = getattr(record, field_name)

        if view._model._name != "ir.ui.view":
            _logger.warning("%s.%s must be a 'ir.ui.view' model." % (record, field_name))
            return None

        ctx = (context or {}).copy()
        ctx['object'] = record
        html = view.render(ctx, engine='ir.qweb', context=ctx).decode('utf8')

        return HTMLSafe(html)

class QwebWidget(osv.AbstractModel):
    _name = 'ir.qweb.widget'

    def _format(self, inner, options, qwebcontext):
        return self.pool['ir.qweb'].eval_str(inner, qwebcontext)

    def format(self, inner, options, qwebcontext):
        return escape(self._format(inner, options, qwebcontext))

class QwebWidgetMonetary(osv.AbstractModel):
    _name = 'ir.qweb.widget.monetary'
    _inherit = 'ir.qweb.widget'

    def _format(self, inner, options, qwebcontext):
        inner = self.pool['ir.qweb'].eval(inner, qwebcontext)
        display = self.pool['ir.qweb'].eval_object(options['display_currency'], qwebcontext)
        precision = int(round(math.log10(display.rounding)))
        fmt = "%.{0}f".format(-precision if precision < 0 else 0)
        lang_code = qwebcontext.context.get('lang') or 'en_US'
        formatted_amount = self.pool['res.lang'].format(
            qwebcontext.cr, qwebcontext.uid, [lang_code], fmt, inner, grouping=True, monetary=True
        )
        pre = post = u''
        if display.position == 'before':
            pre = u'{symbol}\N{NO-BREAK SPACE}'
        else:
            post = u'\N{NO-BREAK SPACE}{symbol}'

        return u'{pre}{0}{post}'.format(
            formatted_amount, pre=pre, post=post
        ).format(symbol=display.symbol,)

class HTMLSafe(object):
    """ HTMLSafe string wrapper, Werkzeug's escape() has special handling for
    objects with a ``__html__`` methods but AFAIK does not provide any such
    object.

    Wrapping a string in HTML will prevent its escaping
    """
    __slots__ = ['string']
    def __init__(self, string):
        self.string = string
    def __html__(self):
        return self.string
    def __str__(self):
        s = self.string
        if isinstance(s, unicode):
            return s.encode('utf-8')
        return s
    def __unicode__(self):
        s = self.string
        if isinstance(s, str):
            return s.decode('utf-8')
        return s

def nl2br(string, options=None):
    """ Converts newlines to HTML linebreaks in ``string``. Automatically
    escapes content unless options['html-escape'] is set to False, and returns
    the result wrapped in an HTMLSafe object.

    :param str string:
    :param dict options:
    :rtype: HTMLSafe
    """
    if options is None: options = {}

    if options.get('html-escape', True):
        string = escape(string)
    return HTMLSafe(string.replace('\n', '<br>\n'))

def get_field_type(field, options):
    """ Gets a t-field's effective type from the field definition and its options """
    return options.get('widget', field.type)

class AssetError(Exception):
    pass
class AssetNotFound(AssetError):
    pass

class AssetsBundle(object):
    # Sass installation:
    #
    #       sudo gem install sass compass bootstrap-sass
    #
    # If the following error is encountered:
    #       'ERROR: Cannot load compass.'
    # Use this:
    #       sudo gem install compass --pre
    cmd_sass = ['sass', '--stdin', '-t', 'compressed', '--unix-newlines', '--compass', '-r', 'bootstrap-sass']
    rx_css_import = re.compile("(@import[^;{]+;?)", re.M)
    rx_sass_import = re.compile("""(@import\s?['"]([^'"]+)['"])""")
    rx_css_split = re.compile("\/\*\! ([a-f0-9-]+) \*\/")

    def __init__(self, xmlid, debug=False, cr=None, uid=None, context=None, registry=None):
        self.xmlid = xmlid
        self.cr = request.cr if cr is None else cr
        self.uid = request.uid if uid is None else uid
        self.context = request.context if context is None else context
        self.registry = request.registry if registry is None else registry
        self.javascripts = []
        self.stylesheets = []
        self.css_errors = []
        self.remains = []
        self._checksum = None

        context = self.context.copy()
        context['inherit_branding'] = False
        context['inherit_branding_auto'] = False
        context['rendering_bundle'] = True
        self.html = self.registry['ir.ui.view'].render(self.cr, self.uid, xmlid, context=context)
        self.parse()

    def parse(self):
        fragments = html.fragments_fromstring(self.html)
        for el in fragments:
            if isinstance(el, basestring):
                self.remains.append(el)
            elif isinstance(el, html.HtmlElement):
                src = el.get('src', '')
                href = el.get('href', '')
                atype = el.get('type')
                media = el.get('media')
                if el.tag == 'style':
                    if atype == 'text/sass' or src.endswith('.sass'):
                        self.stylesheets.append(SassAsset(self, inline=el.text, media=media))
                    else:
                        self.stylesheets.append(StylesheetAsset(self, inline=el.text, media=media))
                elif el.tag == 'link' and el.get('rel') == 'stylesheet' and self.can_aggregate(href):
                    if href.endswith('.sass') or atype == 'text/sass':
                        self.stylesheets.append(SassAsset(self, url=href, media=media))
                    else:
                        self.stylesheets.append(StylesheetAsset(self, url=href, media=media))
                elif el.tag == 'script' and not src:
                    self.javascripts.append(JavascriptAsset(self, inline=el.text))
                elif el.tag == 'script' and self.can_aggregate(src):
                    self.javascripts.append(JavascriptAsset(self, url=src))
                else:
                    self.remains.append(html.tostring(el))
            else:
                try:
                    self.remains.append(html.tostring(el))
                except Exception:
                    # notYETimplementederror
                    raise NotImplementedError

    def can_aggregate(self, url):
        return not urlparse(url).netloc and not url.startswith(('/web/css', '/web/js'))

    def to_html(self, sep=None, css=True, js=True, debug=False):
        if sep is None:
            sep = '\n            '
        response = []
        if debug:
            if css and self.stylesheets:
                self.compile_sass()
                for style in self.stylesheets:
                    response.append(style.to_html())
            if js:
                for jscript in self.javascripts:
                    response.append(jscript.to_html())
        else:
            url_for = self.context.get('url_for', lambda url: url)
            if css and self.stylesheets:
                suffix = ''
                if request:
                    ua = request.httprequest.user_agent
                    if ua.browser == "msie" and int((ua.version or '0').split('.')[0]) < 10:
                        suffix = '.0'
                href = '/web/css%s/%s/%s' % (suffix, self.xmlid, self.version)
                response.append('<link href="%s" rel="stylesheet"/>' % url_for(href))
            if js:
                src = '/web/js/%s/%s' % (self.xmlid, self.version)
                response.append('<script type="text/javascript" src="%s"></script>' % url_for(src))
        response.extend(self.remains)
        return sep + sep.join(response)

    @lazy_property
    def last_modified(self):
        """Returns last modified date of linked files"""
        return max(itertools.chain(
            (asset.last_modified for asset in self.javascripts),
            (asset.last_modified for asset in self.stylesheets),
        ))

    @lazy_property
    def version(self):
        return self.checksum[0:7]

    @lazy_property
    def checksum(self):
        """
        Not really a full checksum.
        We compute a SHA1 on the rendered bundle + max linked files last_modified date
        """
        check = self.html + str(self.last_modified)
        return hashlib.sha1(check).hexdigest()

    def js(self):
        content = self.get_cache('js')
        if content is None:
            content = ';\n'.join(asset.minify() for asset in self.javascripts)
            self.set_cache('js', content)
        return content

    def css(self, page_number=None):
        if page_number is not None:
            return self.css_page(page_number)

        content = self.get_cache('css')
        if content is None:
            self.compile_sass()
            content = '\n'.join(asset.minify() for asset in self.stylesheets)

            if self.css_errors:
                msg = '\n'.join(self.css_errors)
                content += self.css_message(msg.replace('\n', '\\A '))

            # move up all @import rules to the top
            matches = []
            def push(matchobj):
                matches.append(matchobj.group(0))
                return ''

            content = re.sub(self.rx_css_import, push, content)

            matches.append(content)
            content = u'\n'.join(matches)
            if not self.css_errors:
                self.set_cache('css', content)
            content = content.encode('utf-8')

        return content

    def css_page(self, page_number):
        content = self.get_cache('css.%d' % (page_number,))
        if page_number:
            return content
        if content is None:
            css = self.css().decode('utf-8')
            re_rules = '([^{]+\{(?:[^{}]|\{[^{}]*\})*\})'
            re_selectors = '()(?:\s*@media\s*[^{]*\{)?(?:\s*(?:[^,{]*(?:,|\{(?:[^}]*\}))))'
            css_url = '@import url(\'/web/css.%%d/%s/%s\');' % (self.xmlid, self.version)
            pages = [[]]
            page = pages[0]
            page_selectors = 0
            for rule in re.findall(re_rules, css):
                selectors = len(re.findall(re_selectors, rule))
                if page_selectors + selectors < MAX_CSS_RULES:
                    page_selectors += selectors
                    page.append(rule)
                else:
                    pages.append([rule])
                    page = pages[-1]
                    page_selectors = selectors
            if len(pages) == 1:
                pages = []
            for idx, page in enumerate(pages):
                self.set_cache("css.%d" % (idx+1), ''.join(page))
            content = '\n'.join(css_url % i for i in range(1,len(pages)+1))
            self.set_cache("css.0", content)
        if not content:
            return self.css()
        return content

    def get_cache(self, type):
        content = None
        domain = [('url', '=', '/web/%s/%s/%s' % (type, self.xmlid, self.version))]
        bundle = self.registry['ir.attachment'].search_read(self.cr, openerp.SUPERUSER_ID, domain, ['datas'], context=self.context)
        if bundle and bundle[0]['datas']:
            content = bundle[0]['datas'].decode('base64')
        return content

    def set_cache(self, type, content):
        ira = self.registry['ir.attachment']
        url_prefix = '/web/%s/%s/' % (type, self.xmlid)
        # Invalidate previous caches
        try:
            with self.cr.savepoint():
                domain = [('url', '=like', url_prefix + '%')]
                oids = ira.search(self.cr, openerp.SUPERUSER_ID, domain, context=self.context)
                if oids:
                    ira.unlink(self.cr, openerp.SUPERUSER_ID, oids, context=self.context)
                url = url_prefix + self.version
                ira.create(self.cr, openerp.SUPERUSER_ID, dict(
                    datas=content.encode('utf8').encode('base64'),
                    type='binary',
                    name=url,
                    url=url,
                ), context=self.context)
        except psycopg2.Error:
            pass

    def css_message(self, message):
        return """
            body:before {
                background: #ffc;
                width: 100%%;
                font-size: 14px;
                font-family: monospace;
                white-space: pre;
                content: "%s";
            }
        """ % message.replace('"', '\\"')

    def compile_sass(self):
        """
            Checks if the bundle contains any sass content, then compiles it to css.
            Css compilation is done at the bundle level and not in the assets
            because they are potentially interdependant.
        """
        sass = [asset for asset in self.stylesheets if isinstance(asset, SassAsset)]
        if not sass:
            return
        source = '\n'.join([asset.get_source() for asset in sass])

        # move up all @import rules to the top and exclude file imports
        imports = []
        def push(matchobj):
            ref = matchobj.group(2)
            line = '@import "%s"' % ref
            if '.' not in ref and line not in imports and not ref.startswith(('.', '/', '~')):
                imports.append(line)
            return ''
        source = re.sub(self.rx_sass_import, push, source)
        imports.append(source)
        source = u'\n'.join(imports)

        try:
            compiler = Popen(self.cmd_sass, stdin=PIPE, stdout=PIPE, stderr=PIPE)
        except Exception:
            msg = "Could not find 'sass' program needed to compile sass/scss files"
            _logger.error(msg)
            self.css_errors.append(msg)
            return
        result = compiler.communicate(input=source.encode('utf-8'))
        if compiler.returncode:
            error = self.get_sass_error(''.join(result), source=source)
            _logger.warning(error)
            self.css_errors.append(error)
            return
        compiled = result[0].strip().decode('utf8')
        fragments = self.rx_css_split.split(compiled)[1:]
        while fragments:
            asset_id = fragments.pop(0)
            asset = next(asset for asset in sass if asset.id == asset_id)
            asset._content = fragments.pop(0)

    def get_sass_error(self, stderr, source=None):
        # TODO: try to find out which asset the error belongs to
        error = stderr.split('Load paths')[0].replace('  Use --trace for backtrace.', '')
        error += "This error occured while compiling the bundle '%s' containing:" % self.xmlid
        for asset in self.stylesheets:
            if isinstance(asset, SassAsset):
                error += '\n    - %s' % (asset.url if asset.url else '<inline sass>')
        return error

class WebAsset(object):
    html_url = '%s'

    def __init__(self, bundle, inline=None, url=None):
        self.id = str(uuid.uuid4())
        self.bundle = bundle
        self.inline = inline
        self.url = url
        self.cr = bundle.cr
        self.uid = bundle.uid
        self.registry = bundle.registry
        self.context = bundle.context
        self._content = None
        self._filename = None
        self._ir_attach = None
        name = '<inline asset>' if inline else url
        self.name = "%s defined in bundle '%s'" % (name, bundle.xmlid)
        if not inline and not url:
            raise Exception("An asset should either be inlined or url linked")

    def stat(self):
        if not (self.inline or self._filename or self._ir_attach):
            addon = filter(None, self.url.split('/'))[0]
            try:
                # Test url against modules static assets
                mpath = openerp.http.addons_manifest[addon]['addons_path']
                self._filename = mpath + self.url.replace('/', os.path.sep)
            except Exception:
                try:
                    # Test url against ir.attachments
                    fields = ['__last_update', 'datas', 'mimetype']
                    domain = [('type', '=', 'binary'), ('url', '=', self.url)]
                    ira = self.registry['ir.attachment']
                    attach = ira.search_read(self.cr, openerp.SUPERUSER_ID, domain, fields, context=self.context)
                    self._ir_attach = attach[0]
                except Exception:
                    raise AssetNotFound("Could not find %s" % self.name)

    def to_html(self):
        raise NotImplementedError()

    @lazy_property
    def last_modified(self):
        try:
            self.stat()
            if self._filename:
                return datetime.datetime.fromtimestamp(os.path.getmtime(self._filename))
            elif self._ir_attach:
                server_format = openerp.tools.misc.DEFAULT_SERVER_DATETIME_FORMAT
                last_update = self._ir_attach['__last_update']
                try:
                    return datetime.datetime.strptime(last_update, server_format + '.%f')
                except ValueError:
                    return datetime.datetime.strptime(last_update, server_format)
        except Exception:
            pass
        return datetime.datetime(1970, 1, 1)

    @property
    def content(self):
        if not self._content:
            self._content = self.inline or self._fetch_content()
        return self._content

    def _fetch_content(self):
        """ Fetch content from file or database"""
        try:
            self.stat()
            if self._filename:
                with open(self._filename, 'rb') as fp:
                    return fp.read().decode('utf-8')
            else:
                return self._ir_attach['datas'].decode('base64')
        except UnicodeDecodeError:
            raise AssetError('%s is not utf-8 encoded.' % self.name)
        except IOError:
            raise AssetNotFound('File %s does not exist.' % self.name)
        except:
            raise AssetError('Could not get content for %s.' % self.name)

    def minify(self):
        return self.content

    def with_header(self, content=None):
        if content is None:
            content = self.content
        return '\n/* %s */\n%s' % (self.name, content)

class JavascriptAsset(WebAsset):
    def minify(self):
        return self.with_header(rjsmin(self.content))

    def _fetch_content(self):
        try:
            return super(JavascriptAsset, self)._fetch_content()
        except AssetError, e:
            return "console.error(%s);" % json.dumps(e.message)

    def to_html(self):
        if self.url:
            return '<script type="text/javascript" src="%s"></script>' % (self.html_url % self.url)
        else:
            return '<script type="text/javascript" charset="utf-8">%s</script>' % self.with_header()

class StylesheetAsset(WebAsset):
    rx_import = re.compile(r"""@import\s+('|")(?!'|"|/|https?://)""", re.U)
    rx_url = re.compile(r"""url\s*\(\s*('|"|)(?!'|"|/|https?://|data:)""", re.U)
    rx_sourceMap = re.compile(r'(/\*# sourceMappingURL=.*)', re.U)
    rx_charset = re.compile(r'(@charset "[^"]+";)', re.U)

    def __init__(self, *args, **kw):
        self.media = kw.pop('media', None)
        super(StylesheetAsset, self).__init__(*args, **kw)

    @property
    def content(self):
        content = super(StylesheetAsset, self).content
        if self.media:
            content = '@media %s { %s }' % (self.media, content)
        return content

    def _fetch_content(self):
        try:
            content = super(StylesheetAsset, self)._fetch_content()
            web_dir = os.path.dirname(self.url)

            content = self.rx_import.sub(
                r"""@import \1%s/""" % (web_dir,),
                content,
            )

            content = self.rx_url.sub(
                r"url(\1%s/" % (web_dir,),
                content,
            )

            # remove charset declarations, we only support utf-8
            content = self.rx_charset.sub('', content)
        except AssetError, e:
            self.bundle.css_errors.append(e.message)
            return ''
        return content

    def minify(self):
        # remove existing sourcemaps, make no sense after re-mini
        content = self.rx_sourceMap.sub('', self.content)
        # comments
        content = re.sub(r'/\*.*?\*/', '', content, flags=re.S)
        # space
        content = re.sub(r'\s+', ' ', content)
        content = re.sub(r' *([{}]) *', r'\1', content)
        return self.with_header(content)

    def to_html(self):
        media = (' media="%s"' % werkzeug.utils.escape(self.media)) if self.media else ''
        if self.url:
            href = self.html_url % self.url
            return '<link rel="stylesheet" href="%s" type="text/css"%s/>' % (href, media)
        else:
            return '<style type="text/css"%s>%s</style>' % (media, self.with_header())

class SassAsset(StylesheetAsset):
    html_url = '%s.css'
    rx_indent = re.compile(r'^( +|\t+)', re.M)
    indent = None
    reindent = '    '

    def minify(self):
        return self.with_header()

    def to_html(self):
        if self.url:
            try:
                ira = self.registry['ir.attachment']
                url = self.html_url % self.url
                domain = [('type', '=', 'binary'), ('url', '=', self.url)]
                with self.cr.savepoint():
                    ira_id = ira.search(self.cr, openerp.SUPERUSER_ID, domain, context=self.context)
                    if ira_id:
                        # TODO: update only if needed
                        ira.write(self.cr, openerp.SUPERUSER_ID, [ira_id], {'datas': self.content},
                                  context=self.context)
                    else:
                        ira.create(self.cr, openerp.SUPERUSER_ID, dict(
                            datas=self.content.encode('utf8').encode('base64'),
                            mimetype='text/css',
                            type='binary',
                            name=url,
                            url=url,
                        ), context=self.context)
            except psycopg2.Error:
                pass
        return super(SassAsset, self).to_html()

    def get_source(self):
        content = textwrap.dedent(self.inline or self._fetch_content())

        def fix_indent(m):
            ind = m.group()
            if self.indent is None:
                self.indent = ind
                if self.indent == self.reindent:
                    # Don't reindent the file if identation is the final one (reindent)
                    raise StopIteration()
            return ind.replace(self.indent, self.reindent)

        try:
            content = self.rx_indent.sub(fix_indent, content)
        except StopIteration:
            pass
        return "/*! %s */\n%s" % (self.id, content)

def rjsmin(script):
    """ Minify js with a clever regex.
    Taken from http://opensource.perlig.de/rjsmin
    Apache License, Version 2.0 """
    def subber(match):
        """ Substitution callback """
        groups = match.groups()
        return (
            groups[0] or
            groups[1] or
            groups[2] or
            groups[3] or
            (groups[4] and '\n') or
            (groups[5] and ' ') or
            (groups[6] and ' ') or
            (groups[7] and ' ') or
            ''
        )

    result = re.sub(
        r'([^\047"/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]|\r?'
        r'\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]|\r?\n|'
        r'\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|(?:(?<=[(,=:\[!&|?{};\r\n]'
        r')(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/'
        r'))*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*'
        r'(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/)[^\047"/\000-\040]*'
        r'))|(?:(?<=[\000-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\014\01'
        r'6-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*((?:/(?![\r\n/*])[^/'
        r'\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]'
        r'*)*\]))[^/\\\[\r\n]*)*/)[^\047"/\000-\040]*))|(?<=[^\000-!#%&(*,./'
        r':-@\[\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/'
        r'*][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013\01'
        r'4\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040"#'
        r'%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-])((?:[\000-'
        r'\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^'
        r'\000-#%-,./:-@\[-^`{-~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|'
        r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\0'
        r'13\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\0'
        r'00-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+|(?:'
        r'(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
        r']*\*+(?:[^/*][^*]*\*+)*/))*)+', subber, '\n%s\n' % script
    ).strip()
    return result

# vim:et: