# -*- coding: utf-8 -*-
"""
NMR text parser.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import logging
import re
from .cem import cem, chemical_label, lenient_chemical_label, solvent_name
from .common import lbrct, dt, rbrct
from ..utils import first
from .actions import merge, join
from .base import BaseParser
from .elements import W, I, R, Optional, Any, OneOrMore, Not, ZeroOrMore
log = logging.getLogger(__name__)
prefix = Optional(I('a')).hide() + (Optional(lbrct) + W('Tm') + Optional(rbrct) | R('^m\.?pt?\.?$', re.I) | I('melting') + Optional((I('point') | I('temperature') | I('range'))) | R('^m\.?$', re.I) + R('^pt?\.?$', re.I)).hide() + Optional(lbrct + W('Tm') + rbrct) + Optional(W('=') | I('of') | I('was') | I('is') | I('at')).hide() + Optional(I('in') + I('the') + I('range') + Optional(I('of')) | I('about')).hide()
delim = R('^[:;\.,]$')
# TODO: Consider allowing degree symbol to be optional. The prefix should be restrictive enough to stop false positives.
units = (W('°') + Optional(R('^[CFK]\.?$')) | W('K\.?') | W('°C'))('units').add_action(merge)
joined_range = R('^[\+\-–−]?\d+(\.\d+)?[\-–−~∼˜]\d+(\.\d+)?$')('value').add_action(merge)
spaced_range = (R('^[\+\-–−]?\d+(\.\d+)?$') + Optional(units).hide() + (R('^[\-–−~∼˜]$') + R('^[\+\-–−]?\d+(\.\d+)?$') | R('^[\+\-–−]\d+(\.\d+)?$')))('value').add_action(merge)
to_range = (R('^[\+\-–−]?\d+(\.\d+)?$') + Optional(units).hide() + (I('to') + R('^[\+\-–−]?\d+(\.\d+)?$') | R('^[\+\-–−]\d+(\.\d+)?$')))('value').add_action(join)
temp_range = (Optional(R('^[\-–−]$')) + (joined_range | spaced_range | to_range))('value').add_action(merge)
temp_value = (Optional(R('^[~∼˜\<\>]$')) + Optional(R('^[\-–−]$')) + R('^[\+\-–−]?\d+(\.\d+)?$'))('value').add_action(merge)
temp = Optional(lbrct).hide() + (temp_range | temp_value)('value') + Optional(rbrct).hide()
mp = (prefix + Optional(delim).hide() + temp + units)('mp')
bracket_any = lbrct + OneOrMore(Not(mp) + Not(rbrct) + Any()) + rbrct
solvent_phrase = (R('^(re)?crystalli[sz](ation|ed)$', re.I) + (I('with') | I('from')) + cem | solvent_name)
cem_mp_phrase = (Optional(solvent_phrase).hide() + Optional(cem) + Optional(I('having')).hide() + Optional(delim).hide() + Optional(bracket_any).hide() + Optional(delim).hide() + Optional(lbrct) + mp + Optional(rbrct))('mp_phrase')
to_give_mp_phrase = ((I('to') + (I('give') | I('afford') | I('yield') | I('obtain')) | I('affording') | I('afforded') | I('gave') | I('yielded')).hide() + Optional(dt).hide() + (cem | chemical_label | lenient_chemical_label) + ZeroOrMore(Not(mp) + Not(cem) + Any()).hide() + mp)('mp_phrase')
obtained_mp_phrase = ((cem | chemical_label) + (I('is') | I('are') | I('was')).hide() + (I('afforded') | I('obtained') | I('yielded')).hide() + ZeroOrMore(Not(mp) + Not(cem) + Any()).hide() + mp)('mp_phrase')
mp_phrase = cem_mp_phrase | to_give_mp_phrase | obtained_mp_phrase
[docs]class MpParser(BaseParser):
""""""
root = mp_phrase
[docs] def interpret(self, result, start, end):
compound_class = self.model.fields['compound'].model_class()
melting_point = self.model(value=first(result.xpath('./mp/value/text()')),
units=first(result.xpath('./mp/units/text()')))
melting_point.compound = compound_class()
cem_el = first(result.xpath('./cem'))
if cem_el is not None:
melting_point.compound.names = cem_el.xpath('./name/text()')
melting_point.compound.labels = cem_el.xpath('./label/text()')
yield melting_point