#Copyright ReportLab Europe Ltd. 2000-2012

#see license.txt for license details

__version__='''$Id$'''

__doc__='''Apparently not used anywhere, purpose unknown!'''

from tokenize import tokenprog

import sys

def _matchorfail(text, pos):

	match = tokenprog.match(text, pos)

	if match is None: raise ValueError(text, pos)

	return match, match.end()

'''

	Extended dictionary formatting

	We allow expressions in the parentheses instead of

	just a simple variable.

'''

def dictformat(_format, L={}, G={}):

	format = _format

	S = {}

	chunks = []

	pos = 0

	n = 0

	while 1:

		pc = format.find("%", pos)

		if pc < 0: break

		nextchar = format[pc+1]

		if nextchar == "(":

			chunks.append(format[pos:pc])

			pos, level = pc+2, 1

			while level:

				match, pos = _matchorfail(format, pos)

				tstart, tend = match.regs[3]

				token = format[tstart:tend]

				if token == "(": level = level+1

				elif token == ")": level = level-1

			vname = '__superformat_%d' % n

			n += 1

			S[vname] = eval(format[pc+2:pos-1],G,L)

			chunks.append('%%(%s)' % vname)

		else:

			nc = pc+1+(nextchar=="%")

			chunks.append(format[pos:nc])

			pos = nc

	if pos < len(format): chunks.append(format[pos:])

	return (''.join(chunks)) % S

def magicformat(format):

	"""Evaluate and substitute the appropriate parts of the string."""

	frame = sys._getframe(1)

	return dictformat(format,frame.f_locals, frame.f_globals)

if __name__=='__main__':

	from reportlab.lib.formatters import DecimalFormatter

	_DF={}

	def df(n,dp=2,ds='.',ts=','):

		try:

			_df = _DF[dp,ds]

		except KeyError:

			_df = _DF[dp,ds] = DecimalFormatter(places=dp,decimalSep=ds,thousandSep=ts)

		return _df(n)

	from reportlab.lib.extformat import magicformat

	Z={'abc': ('ab','c')}

	x = 300000.23

	percent=79.2

	class dingo:

		a=3

	print((magicformat('''

$%%(df(x,dp=3))s --> $%(df(x,dp=3))s

$%%(df(x,dp=2,ds=',',ts='.'))s --> $%(df(x,dp=2,ds=',',ts='.'))s

%%(percent).2f%%%% --> %(percent).2f%%

%%(dingo.a)s --> %(dingo.a)s

%%(Z['abc'][0])s --> %(Z['abc'][0])s

''')))

	def func0(aa=1):

		def func1(bb=2):

			print((magicformat('bb=%(bb)s Z=%(Z)r')))

		func1('BB')

	func0('AA')