def preview_chemcalc(self, get):
"""
Render an html preview of a chemical formula or equation. get should
contain a key 'formula' and value 'some formula string'.
Returns a json dictionary:
{
'preview' : 'the-preview-html' or ''
'error' : 'the-error' or ''
}
"""
result = {'preview': '',
'error': ''}
formula = get['formula']
if formula is None:
result['error'] = "No formula specified."
return result
try:
result['preview'] = chemcalc.render_to_html(formula)
except pyparsing.ParseException as p:
result['error'] = "Couldn't parse formula: {0}".format(p)
except Exception:
# this is unexpected, so log
log.warning(
"Error while previewing chemical formula", exc_info=True)
result['error'] = "Error while rendering preview"
return result
def preview_chemcalc(self, get):
"""
Render an html preview of a chemical formula or equation. get should
contain a key 'formula' and value 'some formula string'.
Returns a json dictionary:
{
'preview' : 'the-preview-html' or ''
'error' : 'the-error' or ''
}
"""
result = {'preview': '', 'error': ''}
formula = get['formula']
if formula is None:
result['error'] = "No formula specified."
return result
try:
result['preview'] = chemcalc.render_to_html(formula)
except pyparsing.ParseException as p:
result['error'] = "Couldn't parse formula: {0}".format(p)
except Exception:
# this is unexpected, so log
log.warning("Error while previewing chemical formula",
exc_info=True)
result['error'] = "Error while rendering preview"
return result
def test_escaping(self):
"""
Tests that invalid input is escaped.
"""
test_string = "<script>f()</script>"
out = render_to_html(test_string)
correct = u'<span class="math"><span class="inline-error inline"><script>f()</script></span></span>'
self.assertEqual(out, correct)
def test_render_eq4(self):
test_string = "[H^+] + OH^- <-> (H2O)" # with brackets
out = render_to_html(test_string)
correct = u'<span class="math">[H<sup>+</sup>]+OH<sup>-</sup>\u2194(H<sub>2</sub>O)</span>'
self.assertEqual(out, correct)
def test_render_eq3(self):
test_string = "H^+ + OH^- <= H2O" # unsupported arrow
out = render_to_html(test_string)
correct = u'<span class="math"><span class="inline-error inline">H^+ + OH^- <= H2O</span></span>'
self.assertEqual(out, correct)
def test_render_eq2(self):
test_string = "H^+ + OH^- <-> H2O"
out = render_to_html(test_string)
correct = u'<span class="math">H<sup>+</sup>+OH<sup>-</sup>\u2194H<sub>2</sub>O</span>'
self.assertEqual(out, correct)
def test_render_simple_square_brackets(self):
test_string = "[Ar]"
out = render_to_html(test_string)
correct = u'<span class="math">[Ar]</span>'
self.assertEqual(out, correct)
def test_render_simple_round_brackets(self):
test_string = "(Ar)"
out = render_to_html(test_string)
correct = u'<span class="math">(Ar)</span>'
self.assertEqual(out, correct)
def test_render2(self):
test_string = "CO2 + H2O + Fe(OH)3"
out = render_to_html(test_string)
correct = u'<span class="math">CO<sub>2</sub>+H<sub>2</sub>O+Fe(OH)<sub>3</sub></span>'
self.assertEqual(out, correct)
def test_render9(self):
test_string = "5[Ni(NH3)4]^2+ + 5/2SO4^2-"
out = render_to_html(test_string)
correct = u'<span class="math">5[Ni(NH<sub>3</sub>)<sub>4</sub>]<sup>2+</sup>+<sup>5</sup>⁄<sub>2</sub>SO<sub>4</sub><sup>2-</sup></span>'
self.assertEqual(out, correct)
def test_render8(self):
test_string = "H2O(s) + CO2"
out = render_to_html(test_string)
correct = u'<span class="math">H<sub>2</sub>O(s)+CO<sub>2</sub></span>'
self.assertEqual(out, correct)
def test_render7(self):
test_string = "5(H1H212)^70010- + 2H2O + 7/2HCl + H2O"
out = render_to_html(test_string)
correct = u'<span class="math">5(H<sub>1</sub>H<sub>212</sub>)<sup>70010-</sup>+2H<sub>2</sub>O+<sup>7</sup>⁄<sub>2</sub>HCl+H<sub>2</sub>O</span>'
self.assertEqual(out, correct)
def test_render6(self):
test_string = "7/2H^+ + 3/5OH^-"
out = render_to_html(test_string)
correct = u'<span class="math"><sup>7</sup>⁄<sub>2</sub>H<sup>+</sup>+<sup>3</sup>⁄<sub>5</sub>OH<sup>-</sup></span>'
self.assertEqual(out, correct)
def test_render5(self):
test_string = "Fe(OH)^2- + (OH)^-"
out = render_to_html(test_string)
correct = u'<span class="math">Fe(OH)<sup>2-</sup>+(OH)<sup>-</sup></span>'
self.assertEqual(out, correct)
def test_render4(self):
test_string = "H^+ + OH^-"
out = render_to_html(test_string)
correct = u'<span class="math">H<sup>+</sup>+OH<sup>-</sup></span>'
self.assertEqual(out, correct)
def test_render_error(self):
test_string = "5.2H20"
out = render_to_html(test_string)
correct = u'<span class="math"><span class="inline-error inline">5.2H20</span></span>'
self.assertEqual(out, correct)
def test_render_uncorrect_reaction(self):
test_string = "O2C + OH2"
out = render_to_html(test_string)
correct = u'<span class="math">O<sub>2</sub>C+OH<sub>2</sub></span>'
self.assertEqual(out, correct)