52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
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# encoding: utf-8
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"""
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Directly exposed API classes, Presentation for now. Provides some syntactic
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sugar for interacting with the pptx.presentation.Package graph and also
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provides some insulation so not so many classes in the other modules need to
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be named as internal (leading underscore).
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"""
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from __future__ import absolute_import, division, print_function, unicode_literals
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import os
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from .opc.constants import CONTENT_TYPE as CT
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from .package import Package
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def Presentation(pptx=None):
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"""
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Return a |Presentation| object loaded from *pptx*, where *pptx* can be
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either a path to a ``.pptx`` file (a string) or a file-like object. If
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*pptx* is missing or ``None``, the built-in default presentation
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"template" is loaded.
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"""
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if pptx is None:
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pptx = _default_pptx_path()
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presentation_part = Package.open(pptx).main_document_part
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if not _is_pptx_package(presentation_part):
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tmpl = "file '%s' is not a PowerPoint file, content type is '%s'"
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raise ValueError(tmpl % (pptx, presentation_part.content_type))
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return presentation_part.presentation
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def _default_pptx_path():
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"""
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Return the path to the built-in default .pptx package.
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"""
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_thisdir = os.path.split(__file__)[0]
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return os.path.join(_thisdir, "templates", "default.pptx")
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def _is_pptx_package(prs_part):
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"""
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Return |True| if *prs_part* is a valid main document part, |False|
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otherwise.
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"""
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valid_content_types = (CT.PML_PRESENTATION_MAIN, CT.PML_PRES_MACRO_MAIN)
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return prs_part.content_type in valid_content_types
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