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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from base64 import decodestring
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import os
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import re
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from IPython.external.qt import QtCore, QtGui
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from IPython.lib.latextools import latex_to_png
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from IPython.utils.path import ensure_dir_exists
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from IPython.utils.traitlets import Bool
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from IPython.qt.svg import save_svg, svg_to_clipboard, svg_to_image
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from .ipython_widget import IPythonWidget
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class RichIPythonWidget(IPythonWidget):
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""" An IPythonWidget that supports rich text, including lists, images, and
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tables. Note that raw performance will be reduced compared to the plain
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text version.
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"""
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# RichIPythonWidget protected class variables.
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_payload_source_plot = 'IPython.kernel.zmq.pylab.backend_payload.add_plot_payload'
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_jpg_supported = Bool(False)
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# Used to determine whether a given html export attempt has already
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# displayed a warning about being unable to convert a png to svg.
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_svg_warning_displayed = False
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#---------------------------------------------------------------------------
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# 'object' interface
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#---------------------------------------------------------------------------
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def __init__(self, *args, **kw):
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""" Create a RichIPythonWidget.
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"""
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kw['kind'] = 'rich'
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super(RichIPythonWidget, self).__init__(*args, **kw)
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# Configure the ConsoleWidget HTML exporter for our formats.
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self._html_exporter.image_tag = self._get_image_tag
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# Dictionary for resolving document resource names to SVG data.
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self._name_to_svg_map = {}
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# Do we support jpg ?
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# it seems that sometime jpg support is a plugin of QT, so try to assume
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# it is not always supported.
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_supported_format = map(str, QtGui.QImageReader.supportedImageFormats())
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self._jpg_supported = 'jpeg' in _supported_format
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' public interface overides
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#---------------------------------------------------------------------------
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def export_html(self):
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""" Shows a dialog to export HTML/XML in various formats.
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Overridden in order to reset the _svg_warning_displayed flag prior
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to the export running.
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"""
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self._svg_warning_displayed = False
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super(RichIPythonWidget, self).export_html()
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#---------------------------------------------------------------------------
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# 'ConsoleWidget' protected interface
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#---------------------------------------------------------------------------
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def _context_menu_make(self, pos):
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""" Reimplemented to return a custom context menu for images.
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"""
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format = self._control.cursorForPosition(pos).charFormat()
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name = format.stringProperty(QtGui.QTextFormat.ImageName)
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if name:
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menu = QtGui.QMenu()
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menu.addAction('Copy Image', lambda: self._copy_image(name))
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menu.addAction('Save Image As...', lambda: self._save_image(name))
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menu.addSeparator()
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svg = self._name_to_svg_map.get(name, None)
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if svg is not None:
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menu.addSeparator()
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menu.addAction('Copy SVG', lambda: svg_to_clipboard(svg))
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menu.addAction('Save SVG As...',
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lambda: save_svg(svg, self._control))
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else:
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menu = super(RichIPythonWidget, self)._context_menu_make(pos)
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return menu
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#---------------------------------------------------------------------------
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# 'BaseFrontendMixin' abstract interface
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#---------------------------------------------------------------------------
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def _pre_image_append(self, msg, prompt_number):
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"""Append the Out[] prompt and make the output nicer
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Shared code for some the following if statement
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"""
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self._append_plain_text(self.output_sep, True)
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self._append_html(self._make_out_prompt(prompt_number), True)
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self._append_plain_text('\n', True)
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def _handle_execute_result(self, msg):
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"""Overridden to handle rich data types, like SVG."""
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self.log.debug("execute_result: %s", msg.get('content', ''))
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if self.include_output(msg):
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self.flush_clearoutput()
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content = msg['content']
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prompt_number = content.get('execution_count', 0)
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data = content['data']
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metadata = msg['content']['metadata']
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if 'image/svg+xml' in data:
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self._pre_image_append(msg, prompt_number)
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self._append_svg(data['image/svg+xml'], True)
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self._append_html(self.output_sep2, True)
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elif 'image/png' in data:
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self._pre_image_append(msg, prompt_number)
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png = decodestring(data['image/png'].encode('ascii'))
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self._append_png(png, True, metadata=metadata.get('image/png', None))
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self._append_html(self.output_sep2, True)
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elif 'image/jpeg' in data and self._jpg_supported:
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self._pre_image_append(msg, prompt_number)
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jpg = decodestring(data['image/jpeg'].encode('ascii'))
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self._append_jpg(jpg, True, metadata=metadata.get('image/jpeg', None))
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self._append_html(self.output_sep2, True)
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elif 'text/latex' in data:
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self._pre_image_append(msg, prompt_number)
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self._append_latex(data['text/latex'], True)
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self._append_html(self.output_sep2, True)
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else:
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# Default back to the plain text representation.
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return super(RichIPythonWidget, self)._handle_execute_result(msg)
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def _handle_display_data(self, msg):
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"""Overridden to handle rich data types, like SVG."""
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self.log.debug("display_data: %s", msg.get('content', ''))
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if self.include_output(msg):
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self.flush_clearoutput()
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data = msg['content']['data']
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metadata = msg['content']['metadata']
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# Try to use the svg or html representations.
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# FIXME: Is this the right ordering of things to try?
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self.log.debug("display: %s", msg.get('content', ''))
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if 'image/svg+xml' in data:
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svg = data['image/svg+xml']
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self._append_svg(svg, True)
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elif 'image/png' in data:
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# PNG data is base64 encoded as it passes over the network
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# in a JSON structure so we decode it.
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png = decodestring(data['image/png'].encode('ascii'))
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self._append_png(png, True, metadata=metadata.get('image/png', None))
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elif 'image/jpeg' in data and self._jpg_supported:
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jpg = decodestring(data['image/jpeg'].encode('ascii'))
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self._append_jpg(jpg, True, metadata=metadata.get('image/jpeg', None))
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elif 'text/latex' in data:
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self._append_latex(data['text/latex'], True)
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else:
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# Default back to the plain text representation.
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return super(RichIPythonWidget, self)._handle_display_data(msg)
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#---------------------------------------------------------------------------
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# 'RichIPythonWidget' protected interface
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#---------------------------------------------------------------------------
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def _append_latex(self, latex, before_prompt=False, metadata=None):
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""" Append latex data to the widget."""
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try:
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png = latex_to_png(latex, wrap=False)
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except Exception as e:
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self.log.error("Failed to render latex: '%s'", latex, exc_info=True)
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self._append_plain_text("Failed to render latex: %s" % e, before_prompt)
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else:
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self._append_png(png, before_prompt, metadata)
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def _append_jpg(self, jpg, before_prompt=False, metadata=None):
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""" Append raw JPG data to the widget."""
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self._append_custom(self._insert_jpg, jpg, before_prompt, metadata=metadata)
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def _append_png(self, png, before_prompt=False, metadata=None):
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""" Append raw PNG data to the widget.
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"""
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self._append_custom(self._insert_png, png, before_prompt, metadata=metadata)
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def _append_svg(self, svg, before_prompt=False):
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""" Append raw SVG data to the widget.
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"""
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self._append_custom(self._insert_svg, svg, before_prompt)
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def _add_image(self, image):
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""" Adds the specified QImage to the document and returns a
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QTextImageFormat that references it.
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"""
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document = self._control.document()
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name = str(image.cacheKey())
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document.addResource(QtGui.QTextDocument.ImageResource,
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QtCore.QUrl(name), image)
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format = QtGui.QTextImageFormat()
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format.setName(name)
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return format
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def _copy_image(self, name):
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""" Copies the ImageResource with 'name' to the clipboard.
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"""
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image = self._get_image(name)
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QtGui.QApplication.clipboard().setImage(image)
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def _get_image(self, name):
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""" Returns the QImage stored as the ImageResource with 'name'.
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"""
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document = self._control.document()
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image = document.resource(QtGui.QTextDocument.ImageResource,
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QtCore.QUrl(name))
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return image
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def _get_image_tag(self, match, path = None, format = "png"):
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""" Return (X)HTML mark-up for the image-tag given by match.
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Parameters
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----------
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match : re.SRE_Match
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A match to an HTML image tag as exported by Qt, with
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match.group("Name") containing the matched image ID.
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path : string|None, optional [default None]
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If not None, specifies a path to which supporting files may be
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written (e.g., for linked images). If None, all images are to be
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included inline.
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format : "png"|"svg"|"jpg", optional [default "png"]
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Format for returned or referenced images.
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"""
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if format in ("png","jpg"):
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try:
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image = self._get_image(match.group("name"))
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except KeyError:
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return "<b>Couldn't find image %s</b>" % match.group("name")
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if path is not None:
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ensure_dir_exists(path)
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relpath = os.path.basename(path)
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if image.save("%s/qt_img%s.%s" % (path, match.group("name"), format),
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"PNG"):
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return '<img src="%s/qt_img%s.%s">' % (relpath,
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match.group("name"),format)
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else:
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return "<b>Couldn't save image!</b>"
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else:
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ba = QtCore.QByteArray()
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buffer_ = QtCore.QBuffer(ba)
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buffer_.open(QtCore.QIODevice.WriteOnly)
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image.save(buffer_, format.upper())
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buffer_.close()
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return '<img src="data:image/%s;base64,\n%s\n" />' % (
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format,re.sub(r'(.{60})',r'\1\n',str(ba.toBase64())))
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elif format == "svg":
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try:
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svg = str(self._name_to_svg_map[match.group("name")])
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except KeyError:
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if not self._svg_warning_displayed:
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QtGui.QMessageBox.warning(self, 'Error converting PNG to SVG.',
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'Cannot convert PNG images to SVG, export with PNG figures instead. '
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'If you want to export matplotlib figures as SVG, add '
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'to your ipython config:\n\n'
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'\tc.InlineBackend.figure_format = \'svg\'\n\n'
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'And regenerate the figures.',
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QtGui.QMessageBox.Ok)
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self._svg_warning_displayed = True
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return ("<b>Cannot convert PNG images to SVG.</b> "
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"You must export this session with PNG images. "
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"If you want to export matplotlib figures as SVG, add to your config "
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"<span>c.InlineBackend.figure_format = 'svg'</span> "
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"and regenerate the figures.")
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# Not currently checking path, because it's tricky to find a
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# cross-browser way to embed external SVG images (e.g., via
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# object or embed tags).
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# Chop stand-alone header from matplotlib SVG
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offset = svg.find("<svg")
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assert(offset > -1)
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return svg[offset:]
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else:
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return '<b>Unrecognized image format</b>'
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def _insert_jpg(self, cursor, jpg, metadata=None):
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""" Insert raw PNG data into the widget."""
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self._insert_img(cursor, jpg, 'jpg', metadata=metadata)
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def _insert_png(self, cursor, png, metadata=None):
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""" Insert raw PNG data into the widget.
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"""
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self._insert_img(cursor, png, 'png', metadata=metadata)
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def _insert_img(self, cursor, img, fmt, metadata=None):
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""" insert a raw image, jpg or png """
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if metadata:
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width = metadata.get('width', None)
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height = metadata.get('height', None)
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else:
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width = height = None
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try:
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image = QtGui.QImage()
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image.loadFromData(img, fmt.upper())
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if width and height:
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image = image.scaled(width, height, transformMode=QtCore.Qt.SmoothTransformation)
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elif width and not height:
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image = image.scaledToWidth(width, transformMode=QtCore.Qt.SmoothTransformation)
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elif height and not width:
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image = image.scaledToHeight(height, transformMode=QtCore.Qt.SmoothTransformation)
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except ValueError:
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self._insert_plain_text(cursor, 'Received invalid %s data.'%fmt)
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else:
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format = self._add_image(image)
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cursor.insertBlock()
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cursor.insertImage(format)
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cursor.insertBlock()
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def _insert_svg(self, cursor, svg):
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""" Insert raw SVG data into the widet.
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"""
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try:
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image = svg_to_image(svg)
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except ValueError:
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self._insert_plain_text(cursor, 'Received invalid SVG data.')
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else:
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format = self._add_image(image)
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self._name_to_svg_map[format.name()] = svg
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cursor.insertBlock()
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cursor.insertImage(format)
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cursor.insertBlock()
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def _save_image(self, name, format='PNG'):
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""" Shows a save dialog for the ImageResource with 'name'.
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"""
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dialog = QtGui.QFileDialog(self._control, 'Save Image')
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dialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
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dialog.setDefaultSuffix(format.lower())
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dialog.setNameFilter('%s file (*.%s)' % (format, format.lower()))
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if dialog.exec_():
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filename = dialog.selectedFiles()[0]
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image = self._get_image(name)
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image.save(filename, format)
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