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"""
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A print function that pretty prints sympy Basic objects.
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:moduleauthor: Brian Granger
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Usage
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=====
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Once the extension is loaded, Sympy Basic objects are automatically
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pretty-printed.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from IPython.lib.latextools import latex_to_png
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from IPython.testing import decorators as dec
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# use @dec.skipif_not_sympy to skip tests requiring sympy
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try:
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from sympy import pretty, latex
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except ImportError:
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pass
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#-----------------------------------------------------------------------------
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# Definitions of special display functions for use with IPython
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#-----------------------------------------------------------------------------
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def print_basic_unicode(o, p, cycle):
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"""A function to pretty print sympy Basic objects."""
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if cycle:
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return p.text('Basic(...)')
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out = pretty(o, use_unicode=True)
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if '\n' in out:
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p.text(u'\n')
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p.text(out)
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def print_png(o):
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"""A function to display sympy expression using LaTex -> PNG."""
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s = latex(o, mode='inline')
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# mathtext does not understand certain latex flags, so we try to replace
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# them with suitable subs.
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s = s.replace('\\operatorname','')
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s = s.replace('\\overline', '\\bar')
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png = latex_to_png(s)
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return png
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def can_print_latex(o):
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"""
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Return True if type o can be printed with LaTeX.
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If o is a container type, this is True if and only if every element of o
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can be printed with LaTeX.
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"""
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import sympy
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if isinstance(o, (list, tuple)):
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return all(can_print_latex(i) for i in o)
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elif isinstance(o, dict):
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return all((isinstance(i, basestring) or can_print_latex(i)) and can_print_latex(o[i]) for i in o)
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elif isinstance(o,(sympy.Basic, sympy.matrices.Matrix, int, long, float)):
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return True
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return False
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def print_latex(o):
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"""A function to generate the latex representation of sympy
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expressions."""
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if can_print_latex(o):
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s = latex(o, mode='plain')
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s = s.replace('\\dag','\\dagger')
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s = s.strip('$')
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return '$$%s$$' % s
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# Fallback to the string printer
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return None
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_loaded = False
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def load_ipython_extension(ip):
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"""Load the extension in IPython."""
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global _loaded
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if not _loaded:
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plaintext_formatter = ip.display_formatter.formatters['text/plain']
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for cls in (object, set, frozenset, str):
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# set and frozen set are currently broken with SymPy's latex()
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# function. See http://code.google.com/p/sympy/issues/detail?id=3062.
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plaintext_formatter.for_type(cls, print_basic_unicode)
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plaintext_formatter.for_type_by_name(
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'sympy.core.basic', 'Basic', print_basic_unicode
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)
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plaintext_formatter.for_type_by_name(
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'sympy.matrices.matrices', 'Matrix', print_basic_unicode
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)
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png_formatter = ip.display_formatter.formatters['image/png']
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png_formatter.for_type_by_name(
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'sympy.core.basic', 'Basic', print_png
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)
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for cls in (list, tuple, dict, int, long, float):
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png_formatter.for_type(cls, print_png)
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latex_formatter = ip.display_formatter.formatters['text/latex']
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latex_formatter.for_type_by_name(
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'sympy.core.basic', 'Basic', print_latex
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)
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latex_formatter.for_type_by_name(
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'sympy.matrices.matrices', 'Matrix', print_latex
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)
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for cls in (list, tuple):
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# Use LaTeX only if every element is printable by latex
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latex_formatter.for_type(cls, print_latex)
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_loaded = True
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