def test_preview():
x = Symbol("x")
obj = BytesIO()
try:
preview(x, output="png", viewer="BytesIO", outputbuffer=obj)
except RuntimeError:
pass # latex not installed on CI server
def test_preview():
x = Symbol('x')
obj = BytesIO()
try:
preview(x, output='png', viewer='BytesIO', outputbuffer=obj)
except RuntimeError:
pass # latex not installed on CI server
def _mathml(expression): global filei filename = 'eq%d.png' % filei filei = filei + 1 preview(expression, output='png', viewer='file', filename=filename) latexstr = latex(expression) return '<img src="%s" alt="%s" />' % (filename, latexstr)
def test_preview_unicode_symbol():
# issue 9107
a = Symbol('α')
obj = BytesIO()
try:
preview(a, output='png', viewer='BytesIO', outputbuffer=obj)
except RuntimeError:
pass # latex not installed on CI server
def write_to_file(latex, filename):
preview(
"$$%s$$" % (latex, ),
output="png",
viewer="file",
filename=filename,
preamble=PREAMBLE,
)
def test_preview_latex_construct_in_expr():
# see PR 9801
x = Symbol('x')
pw = Piecewise((1, Eq(x, 0)), (0, True))
obj = BytesIO()
try:
preview(pw, output='png', viewer='BytesIO', outputbuffer=obj)
except RuntimeError:
pass # latex not installed on CI server
def _preview_wrapper(o):
exprbuffer = BytesIO()
try:
preview(o, output='png', viewer='BytesIO',
outputbuffer=exprbuffer, preamble=preamble,
dvioptions=dvioptions)
except Exception as e:
# IPython swallows exceptions
debug("png printing:", "_preview_wrapper exception raised:",
repr(e))
raise
return exprbuffer.getvalue()
def xdvi(filename='tmplatex.tex', debug=False):
"""
Post processes LaTeX output (see comments below), adds preamble and
postscript, generates tex file, inputs file to latex, displays resulting
dvi file with xdvi or yap.
"""
if not LatexPrinter.LaTeX_flg:
return
body = sys.stdout.getvalue()
LatexPrinter.restore()
body_lst = body.split('\n')
body = ''
array_flg = False
eqnarray_flg = False
raw_flg = False
i = iter(body_lst)
line = i.next()
while True:
if '$' in line: # Inline math expression(s)
if len(line) > 0:
line += '\\newline \n'
body += line
try:
line = i.next()
except StopIteration:
break
elif '%' in line: # Raw LaTeX input
"""
If % in line assume line is beginning of raw LaTeX input and stop
post processing
"""
line = line.replace('%', '')
raw_flg = True
while raw_flg:
if '%' in line:
"""
If % in line assume line is end of LaTeX input and begin
post processing
"""
raw_flg = False
line = line.replace('%', '') + '\n'
else:
line += '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
elif '#' in line: # Array input
"""
If # in line assume line is beginning of array input and contains
\begin{array} statement
"""
line = line.replace('#', '')
array_flg = True
line = '\\begin{equation*}\n' + line
while array_flg:
if '#' in line:
"""
If # in line assume line is end of array input and contains
\end{array} statement
"""
array_flg = False
line = line.replace('#', '')
line += '\\end{equation*}\n'
else:
line += '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
elif '@' in line: # Align input
"""
If @ in line assume line is beginning of align input
"""
line = line.replace('@', '')
line = line.replace('=', '& = ')
eqnarray_flg = True
line = '\\begin{align*}\n' + line
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
while eqnarray_flg:
if '@' in line:
"""
If @ in line assume line is end of align input
"""
eqnarray_flg = False
line = line.replace('@', '')
line += '\\end{align*}\n'
else:
line + '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
else:
if '=' in line: # Single line equation
line = '\\begin{equation*}\n' + line + '\n\\end{equation*}'
else: # Text with no math expression(s)unless \ or _ in line
if '\\' in line or '_' in line or '^' in line:
line = '\\begin{equation*}\n' + line + '\n\\end{equation*}'
else:
if len(line) > 0:
line += '\\newline \n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
preview(body,
output='dvi',
outputTexFile=filename,
preamble=LatexPrinter.preamble)
LatexPrinter.LaTeX_flg = False
return
def xdvi(filename='tmplatex.tex', debug=False):
"""
Post processes LaTeX output (see comments below), adds preamble and
postscript, generates tex file, inputs file to latex, displays resulting
dvi file with xdvi or yap.
"""
if not LatexPrinter.LaTeX_flg:
return
body = sys.stdout.getvalue()
LatexPrinter.restore()
body_lst = body.split('\n')
body = ''
array_flg = False
eqnarray_flg = False
raw_flg = False
i = iter(body_lst)
line = i.next()
while True:
if '$' in line: # Inline math expression(s)
if len(line) > 0:
line += '\\newline \n'
body += line
try:
line = i.next()
except StopIteration:
break
elif '%' in line: # Raw LaTeX input
"""
If % in line assume line is beginning of raw LaTeX input and stop
post processing
"""
line = line.replace('%', '')
raw_flg = True
while raw_flg:
if '%' in line:
"""
If % in line assume line is end of LaTeX input and begin
post processing
"""
raw_flg = False
line = line.replace('%', '') + '\n'
else:
line += '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
elif '#' in line: # Array input
"""
If # in line assume line is beginning of array input and contains
\begin{array} statement
"""
line = line.replace('#', '')
array_flg = True
line = '\\begin{equation*}\n' + line
while array_flg:
if '#' in line:
"""
If # in line assume line is end of array input and contains
\end{array} statement
"""
array_flg = False
line = line.replace('#', '')
line += '\\end{equation*}\n'
else:
line += '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
elif '@' in line: # Align input
"""
If @ in line assume line is beginning of align input
"""
line = line.replace('@', '')
line = line.replace('=', '& = ')
eqnarray_flg = True
line = '\\begin{align*}\n' + line
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
while eqnarray_flg:
if '@' in line:
"""
If @ in line assume line is end of align input
"""
eqnarray_flg = False
line = line.replace('@', '')
line += '\\end{align*}\n'
else:
line + '\n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
else:
if '=' in line: # Single line equation
line = '\\begin{equation*}\n' + line + '\n\\end{equation*}'
else: # Text with no math expression(s)unless \ or _ in line
if '\\' in line or '_' in line or '^' in line:
line = '\\begin{equation*}\n' + line + '\n\\end{equation*}'
else:
if len(line) > 0:
line += '\\newline \n'
line = process_equals(line)
body += line
try:
line = i.next()
except StopIteration:
break
preview(body, output='dvi', outputTexFile=filename,
preamble=LatexPrinter.preamble)
LatexPrinter.LaTeX_flg = False
return