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from __future__ import print_function
from metakernel import MetaKernel, ProcessMetaKernel, REPLWrapper, u
from metakernel.pexpect import which
from IPython.display import Image, SVG
import subprocess
from xml.dom import minidom
import os
import tempfile
from . import __version__
class ScilabKernel(ProcessMetaKernel):
implementation = 'Scilab Kernel'
implementation_version = __version__,
language = 'scilab'
language_version = __version__,
banner = "Scilab Kernel",
language_info = {
'name': 'scilab',
'file_extension': '.sci',
"codemirror_mode": "Octave",
"version": __version__,
'help_links': MetaKernel.help_links,
}
_setup = """
try
getd(".");
catch
end
"""
_first = True
_banner = None
_executable = None
@property
def executable(self):
if self._executable:
return self._executable
executable = os.environ.get('SCILAB_EXECUTABLE', None)
if not executable or not which(executable):
if os.name == 'nt':
executable = 'Scilex'
else:
executable = 'scilab'
if not which(executable):
msg = ('Scilab Executable not found, please add to path or set'
'"SCILAB_EXECUTABLE" environment variable')
raise OSError(msg)
self._executable = executable
return executable
@property
def banner(self):
if self._banner is None:
call = '%s -version; true' % self.executable
banner = subprocess.check_output(call, shell=True)
self._banner = banner.decode('utf-8')
return self._banner
def makeWrapper(self):
"""Start a Scilab process and return a :class:`REPLWrapper` object.
"""
if os.name == 'nt':
orig_prompt = u(chr(3))
prompt_cmd = u('disp(char(3))')
change_prompt = None
else:
orig_prompt = u('-->')
prompt_cmd = None
change_prompt = None
self._first = True
executable = self.executable + ' -nw'
wrapper = REPLWrapper(executable, orig_prompt, change_prompt,
prompt_emit_cmd=prompt_cmd)
wrapper.child.linesep = '\n'
return wrapper
def _do_execute_direct(self, code):
'disp(char(2));' + code
resp = super(ScilabKernel, self).do_execute_direct(code)
resp = [line for line in str(resp).splitlines()
if not line.startswith(chr(27))]
return '\n'.join(resp)
def Print(self, text):
text = [line.strip() for line in str(text).splitlines()
if (not line.startswith(chr(27)))]
text = '\n'.join(text)
if text:
super(ScilabKernel, self).Print(text)
def do_execute_direct(self, code):
if self._first:
self._first = False
self.handle_plot_settings()
self._do_execute_direct(self._setup)
self._skipping = os.name != 'nt'
super(ScilabKernel, self).do_execute_direct(code, self.Print)
if self.plot_settings.get('backend', None) == 'inline':
plot_dir = tempfile.mkdtemp()
self._make_figs(plot_dir)
width, height = 0, 0
for fname in os.listdir(plot_dir):
filename = os.path.join(plot_dir, fname)
try:
if fname.lower().endswith('.svg'):
im = SVG(filename)
if ',' in self.plot_settings['size']:
size = self.plot_settings['size']
width, height = size.split(',')
width, height = int(width), int(height)
im.data = self._fix_svg_size(im.data,
size=(width, height))
else:
im = Image(filename)
self.Display(im)
except Exception as e:
self.Error(e)
def get_kernel_help_on(self, info, level=0, none_on_fail=False):
obj = info.get('help_obj', '')
if not obj or len(obj.split()) > 1:
if none_on_fail:
return None
else:
return ""
self._do_execute_direct('help %s' % obj)
def do_shutdown(self, restart):
self.wrapper.sendline('quit')
super(ScilabKernel, self).do_shutdown(restart)
def get_completions(self, info):
"""
Get completions from kernel based on info dict.
"""
cmd = 'completion("%s")' % info['obj']
output = self._do_execute_direct(cmd)
if not output:
return
output = output.replace('!', '')
return [line.strip() for line in output.splitlines()
if info['obj'] in line]
def handle_plot_settings(self):
"""Handle the current plot settings"""
settings = self.plot_settings
if settings.get('format', None) is None:
settings.clear()
settings.setdefault('backend', 'inline')
settings.setdefault('format', 'svg')
settings.setdefault('size', '560,420')
cmds = []
self._plot_fmt = settings['format']
cmds.append('h = gdf();')
cmds.append('h.figure_position = [0, 0];')
width, height = 560, 420
if isinstance(settings['size'], tuple):
width, height = settings['size']
elif settings['size']:
try:
width, height = settings['size'].split(',')
width, height = int(width), int(height)
except Exception as e:
self.Error('Error setting plot settings: %s' % e)
cmds.append('h.figure_size = [%s,%s];' % (width, height))
cmds.append('h.axes_size = [%s * 0.98, %s * 0.8];' % (width, height))
if settings['backend'] == 'inline':
cmds.append('h.visible = "off";')
else:
cmds.append('h.visible = "on";')
super(ScilabKernel, self).do_execute_direct('\n'.join(cmds))
def _make_figs(self, plot_dir):
plot_format = self._plot_fmt
cmd = """
ids_array=winsid();
for i=1:length(ids_array)
id=ids_array(i);
outfile = sprintf('%(plot_dir)s/__ipy_sci_fig_%%03d', i);
if '%(plot_format)s' == 'jpg' then
xs2jpg(id, outfile + '.jpg');
elseif '%(plot_format)s' == 'jpeg' then
xs2jpg(id, outfile + '.jpeg');
elseif '%(plot_format)s' == 'png' then
xs2png(id, outfile);
else
xs2svg(id, outfile);
end
close(get_figure_handle(id));
end
""" % locals()
super(ScilabKernel, self).do_execute_direct(cmd.replace('\n', ''))
def _fix_svg_size(self, image, size=None):
"""
Scilab SVGs do not have height/width attributes. Set
these to be the same as the viewBox, so that the browser
scales the image correctly.
Parameters
----------
image : str
SVG data.
size : tuple of int
Image width, height.
"""
(svg,) = minidom.parseString(image).getElementsByTagName('svg')
viewbox = svg.getAttribute('viewBox').split(' ')
if size is not None and size[0] is not None:
width, height = size
else:
width, height = viewbox[2:]
svg.setAttribute('width', '%dpx' % int(width))
svg.setAttribute('height', '%dpx' % int(height))
return svg.toxml()
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