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# -*- coding: utf-8 -*-
# © 2016 Grupo ESOC Ingeniería de Servicios, S.L.U. - Jairo Llopis
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
import logging
from lxml import etree, html
from openerp import api, models
_logger = logging.getLogger(__name__)
class IrFieldsConverter(models.Model):
_inherit = "ir.fields.converter"
@api.model
def text_from_html(self, html_content, max_words=None, max_chars=None,
ellipsis=u"", fail=False):
"""Extract text from an HTML field in a generator.
:param str html_content:
HTML contents from where to extract the text.
:param int max_words:
Maximum amount of words allowed in the resulting string.
:param int max_chars:
Maximum amount of characters allowed in the resulting string. If
you apply this limit, beware that the last word could get cut in an
unexpected place.
:param str ellipsis:
Character(s) to be appended to the end of the resulting string if
it gets truncated after applying limits set in :param:`max_words`
or :param:`max_chars`. If you want nothing applied, just set an
empty string.
:param bool fail:
If ``True``, exceptions will be raised. Otherwise, an empty string
will be returned on failure.
"""
# Parse HTML
try:
doc = html.fromstring(html_content)
except (etree.XMLSyntaxError, etree.ParserError):
if fail:
raise
else:
_logger.exception("Failure parsing this HTML:\n%s",
html_content)
return ""
# Get words
words = u"".join(doc.xpath("//text()")).split()
# Truncate words
suffix = max_words and len(words) > max_words
if max_words:
words = words[:max_words]
# Get text
text = u" ".join(words)
# Truncate text
suffix = suffix or max_chars and len(text) > max_chars
if max_chars:
text = text[:max_chars - (len(ellipsis) if suffix else 0)].strip()
# Append ellipsis if needed
if suffix:
text += ellipsis
return text