82 lines
2.1 KiB
Python
82 lines
2.1 KiB
Python
#Copyright ReportLab Europe Ltd. 2000-2004
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#see license.txt for license details
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#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/lib/extformat.py
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from tokenize import tokenprog
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import sys
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def _matchorfail(text, pos):
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match = tokenprog.match(text, pos)
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if match is None: raise ValueError(text, pos)
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return match, match.end()
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'''
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Extended dictionary formatting
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We allow expressions in the parentheses instead of
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just a simple variable.
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'''
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def dictformat(_format, L={}, G={}):
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format = _format
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S = {}
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chunks = []
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pos = 0
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n = 0
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while 1:
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pc = format.find("%", pos)
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if pc < 0: break
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nextchar = format[pc+1]
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if nextchar == "(":
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chunks.append(format[pos:pc])
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pos, level = pc+2, 1
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while level:
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match, pos = _matchorfail(format, pos)
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tstart, tend = match.regs[3]
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token = format[tstart:tend]
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if token == "(": level = level+1
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elif token == ")": level = level-1
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vname = '__superformat_%d' % n
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n += 1
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S[vname] = eval(format[pc+2:pos-1],L,G)
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chunks.append('%%(%s)' % vname)
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else:
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nc = pc+1+(nextchar=="%")
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chunks.append(format[pos:nc])
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pos = nc
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if pos < len(format): chunks.append(format[pos:])
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return (''.join(chunks)) % S
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def magicformat(format):
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"""Evaluate and substitute the appropriate parts of the string."""
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try: 1/0
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except: frame = sys.exc_traceback.tb_frame
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while frame.f_globals["__name__"] == __name__: frame = frame.f_back
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return dictformat(format,frame.f_locals, frame.f_globals)
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if __name__=='__main__':
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from reportlab.lib.formatters import DecimalFormatter
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_DF={}
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def df(n,dp=2,ds='.',ts=','):
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try:
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_df = _DF[dp,ds]
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except KeyError:
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_df = _DF[dp,ds] = DecimalFormatter(places=dp,decimalSep=ds,thousandSep=ts)
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return _df(n)
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from reportlab.lib.extformat import magicformat
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Z={'abc': ('ab','c')}
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x = 300000.23
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percent=79.2
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class dingo:
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a=3
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print magicformat('''
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$%%(df(x,dp=3))s --> $%(df(x,dp=3))s
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$%%(df(x,dp=2,ds=',',ts='.'))s --> $%(df(x,dp=2,ds=',',ts='.'))s
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%%(percent).2f%%%% --> %(percent).2f%%
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%%(dingo.a)s --> %(dingo.a)s
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%%(Z['abc'][0])s --> %(Z['abc'][0])s
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''')
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