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126 lines
4.5 KiB
Python
126 lines
4.5 KiB
Python
# Script to generate CaseConvert.cxx from Python's Unicode data
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# Should be run rarely when a Python with a new version of Unicode data is available.
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# Requires Python 3.3 or later
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# Should not be run with old versions of Python.
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# Current best approach divides case conversions into two cases:
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# simple symmetric and complex.
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# Simple symmetric is where a lower and upper case pair convert to each
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# other and the folded form is the same as the lower case.
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# There are 1006 symmetric pairs.
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# These are further divided into ranges (stored as lower, upper, range length,
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# range pitch and singletons (stored as lower, upper).
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# Complex is for cases that don't fit the above: where there are multiple
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# characters in one of the forms or fold is different to lower or
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# lower(upper(x)) or upper(lower(x)) are not x. These are represented as UTF-8
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# strings with original, folded, upper, and lower separated by '|'.
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# There are 126 complex cases.
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import codecs, itertools, os, string, sys, unicodedata
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from FileGenerator import Regenerate
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def contiguousRanges(l, diff):
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# l is s list of lists
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# group into lists where first element of each element differs by diff
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out = [[l[0]]]
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for s in l[1:]:
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if s[0] != out[-1][-1][0] + diff:
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out.append([])
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out[-1].append(s)
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return out
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def flatten(listOfLists):
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"Flatten one level of nesting"
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return itertools.chain.from_iterable(listOfLists)
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def conversionSets():
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# For all Unicode characters, see whether they have case conversions
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# Return 2 sets: one of simple symmetric conversion cases and another
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# with complex cases.
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complexes = []
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symmetrics = []
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for ch in range(sys.maxunicode):
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if ch >= 0xd800 and ch <= 0xDBFF:
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continue
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if ch >= 0xdc00 and ch <= 0xDFFF:
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continue
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uch = chr(ch)
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fold = uch.casefold()
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upper = uch.upper()
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lower = uch.lower()
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symmetric = False
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if uch != upper and len(upper) == 1 and uch == lower and uch == fold:
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lowerUpper = upper.lower()
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foldUpper = upper.casefold()
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if lowerUpper == foldUpper and lowerUpper == uch:
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symmetric = True
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symmetrics.append((ch, ord(upper), ch - ord(upper)))
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if uch != lower and len(lower) == 1 and uch == upper and lower == fold:
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upperLower = lower.upper()
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if upperLower == uch:
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symmetric = True
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if fold == uch:
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fold = ""
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if upper == uch:
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upper = ""
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if lower == uch:
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lower = ""
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if (fold or upper or lower) and not symmetric:
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complexes.append((uch, fold, upper, lower))
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return symmetrics, complexes
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def groupRanges(symmetrics):
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# Group the symmetrics into groups where possible, returning a list
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# of ranges and a list of symmetrics that didn't fit into a range
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def distance(s):
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return s[2]
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groups = []
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uniquekeys = []
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for k, g in itertools.groupby(symmetrics, distance):
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groups.append(list(g)) # Store group iterator as a list
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uniquekeys.append(k)
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contiguousGroups = flatten([contiguousRanges(g, 1) for g in groups])
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longGroups = [(x[0][0], x[0][1], len(x), 1) for x in contiguousGroups if len(x) > 4]
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oneDiffs = [s for s in symmetrics if s[2] == 1]
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contiguousOnes = flatten([contiguousRanges(g, 2) for g in [oneDiffs]])
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longOneGroups = [(x[0][0], x[0][1], len(x), 2) for x in contiguousOnes if len(x) > 4]
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rangeGroups = sorted(longGroups+longOneGroups, key=lambda s: s[0])
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rangeCoverage = list(flatten([range(r[0], r[0]+r[2]*r[3], r[3]) for r in rangeGroups]))
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nonRanges = [(l, u) for l, u, d in symmetrics if l not in rangeCoverage]
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return rangeGroups, nonRanges
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def escape(s):
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return "".join((chr(c) if chr(c) in string.ascii_letters else "\\x%x" % c) for c in s.encode('utf-8'))
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def updateCaseConvert():
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symmetrics, complexes = conversionSets()
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rangeGroups, nonRanges = groupRanges(symmetrics)
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print(len(rangeGroups), "ranges")
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rangeLines = ["%d,%d,%d,%d, " % x for x in rangeGroups]
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print(len(nonRanges), "non ranges")
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nonRangeLines = ["%d,%d, " % x for x in nonRanges]
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print(len(symmetrics), "symmetric")
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complexLines = ['"%s|%s|%s|%s|"' % tuple(escape(t) for t in x) for x in complexes]
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print(len(complexLines), "complex")
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Regenerate("../src/CaseConvert.cxx", "//", rangeLines, nonRangeLines, complexLines)
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updateCaseConvert()
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