| 1 | #!/usr/bin/env python3
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| 2 | #
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| 3 | # Portions of this script have been (shamelessly) stolen from the
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| 4 | # prior work of Daniel Veillard (genUnicode.py)
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| 5 | #
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| 6 | # I, however, take full credit for any bugs, errors or difficulties :-)
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| 7 | #
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| 8 | # William Brack
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| 9 | # October 2003
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| 10 | #
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| 11 | # 18 October 2003
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| 12 | # Modified to maintain binary compatibility with previous library versions
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| 13 | # by adding a suffix 'Q' ('quick') to the macro generated for the original,
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| 14 | # function, and adding generation of a function (with the original name) which
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| 15 | # instantiates the macro.
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| 16 | #
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| 17 |
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| 18 | import sys
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| 19 | import time
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| 20 |
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| 21 | #
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| 22 | # A routine to take a list of yes/no (1, 0) values and turn it
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| 23 | # into a list of ranges. This will later be used to determine whether
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| 24 | # to generate single-byte lookup tables, or inline comparisons
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| 25 | #
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| 26 | def makeRange(lst):
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| 27 | ret = []
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| 28 | pos = 0
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| 29 | while pos < len(lst):
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| 30 | try: # index generates exception if not present
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| 31 | s = lst[pos:].index(1) # look for start of next range
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| 32 | except:
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| 33 | break # if no more, finished
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| 34 | pos += s # pointer to start of possible range
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| 35 | try:
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| 36 | e = lst[pos:].index(0) # look for end of range
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| 37 | e += pos
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| 38 | except: # if no end, set to end of list
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| 39 | e = len(lst)
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| 40 | ret.append((pos, e-1)) # append range tuple to list
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| 41 | pos = e + 1 # ready to check for next range
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| 42 | return ret
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| 43 |
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| 44 | sources = "chvalid.def" # input filename
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| 45 |
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| 46 | # minTableSize gives the minimum number of ranges which must be present
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| 47 | # before a 256-byte lookup table is produced. If there are less than this
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| 48 | # number, a macro with inline comparisons is generated
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| 49 | minTableSize = 6
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| 50 |
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| 51 | # dictionary of functions, key=name, element contains char-map and range-list
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| 52 | Functs = {}
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| 53 |
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| 54 | state = 0
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| 55 |
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| 56 | try:
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| 57 | defines = open("chvalid.def", "r")
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| 58 | except:
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| 59 | print("Missing chvalid.def, aborting ...")
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| 60 | sys.exit(1)
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| 61 |
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| 62 | #
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| 63 | # The lines in the .def file have three types:-
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| 64 | # name: Defines a new function block
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| 65 | # ur: Defines individual or ranges of unicode values
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| 66 | # end: Indicates the end of the function block
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| 67 | #
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| 68 | # These lines are processed below.
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| 69 | #
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| 70 | for line in defines.readlines():
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| 71 | # ignore blank lines, or lines beginning with '#'
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| 72 | if line[0] == '#':
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| 73 | continue
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| 74 | line = line.strip()
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| 75 | if line == '':
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| 76 | continue
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| 77 | # split line into space-separated fields, then split on type
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| 78 | try:
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| 79 | fields = line.split(' ')
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| 80 | #
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| 81 | # name line:
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| 82 | # validate any previous function block already ended
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| 83 | # validate this function not already defined
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| 84 | # initialize an entry in the function dicitonary
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| 85 | # including a mask table with no values yet defined
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| 86 | #
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| 87 | if fields[0] == 'name':
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| 88 | name = fields[1]
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| 89 | if state != 0:
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| 90 | print("'name' %s found before previous name" \
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| 91 | "completed" % (fields[1]))
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| 92 | continue
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| 93 | state = 1
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| 94 | if name in Functs:
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| 95 | print("name '%s' already present - may give" \
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| 96 | " wrong results" % (name))
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| 97 | else:
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| 98 | # dict entry with two list elements (chdata, rangedata)
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| 99 | Functs[name] = [ [], [] ]
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| 100 | for v in range(256):
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| 101 | Functs[name][0].append(0)
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| 102 | #
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| 103 | # end line:
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| 104 | # validate there was a preceding function name line
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| 105 | # set state to show no current function active
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| 106 | #
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| 107 | elif fields[0] == 'end':
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| 108 | if state == 0:
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| 109 | print("'end' found outside of function block")
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| 110 | continue
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| 111 | state = 0
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| 112 |
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| 113 | #
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| 114 | # ur line:
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| 115 | # validate function has been defined
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| 116 | # process remaining fields on the line, which may be either
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| 117 | # individual unicode values or ranges of values
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| 118 | #
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| 119 | elif fields[0] == 'ur':
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| 120 | if state != 1:
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| 121 | raise Exception("'ur' found outside of 'name' block")
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| 122 | for el in fields[1:]:
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| 123 | pos = el.find('..')
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| 124 | # pos <=0 means not a range, so must be individual value
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| 125 | if pos <= 0:
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| 126 | # cheap handling of hex or decimal values
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| 127 | if el[0:2] == '0x':
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| 128 | value = int(el[2:],16)
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| 129 | elif el[0] == "'":
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| 130 | value = ord(el[1])
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| 131 | else:
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| 132 | value = int(el)
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| 133 | if ((value < 0) | (value > 0x1fffff)):
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| 134 | raise Exception('Illegal value (%s) in ch for'\
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| 135 | ' name %s' % (el,name))
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| 136 | # for ur we have only ranges (makes things simpler),
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| 137 | # so convert val to range
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| 138 | currange = (value, value)
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| 139 | # pos > 0 means this is a range, so isolate/validate
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| 140 | # the interval
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| 141 | else:
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| 142 | # split the range into it's first-val, last-val
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| 143 | (first, last) = el.split("..")
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| 144 | # convert values from text into binary
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| 145 | if first[0:2] == '0x':
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| 146 | start = int(first[2:],16)
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| 147 | elif first[0] == "'":
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| 148 | start = ord(first[1])
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| 149 | else:
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| 150 | start = int(first)
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| 151 | if last[0:2] == '0x':
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| 152 | end = int(last[2:],16)
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| 153 | elif last[0] == "'":
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| 154 | end = ord(last[1])
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| 155 | else:
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| 156 | end = int(last)
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| 157 | if (start < 0) | (end > 0x1fffff) | (start > end):
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| 158 | raise Exception("Invalid range '%s'" % el)
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| 159 | currange = (start, end)
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| 160 | # common path - 'currange' has the range, now take care of it
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| 161 | # We split on single-byte values vs. multibyte
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| 162 | if currange[1] < 0x100: # single-byte
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| 163 | for ch in range(currange[0],currange[1]+1):
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| 164 | # validate that value not previously defined
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| 165 | if Functs[name][0][ch]:
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| 166 | msg = "Duplicate ch value '%s' for name '%s'" % (el, name)
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| 167 | raise Exception(msg)
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| 168 | Functs[name][0][ch] = 1
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| 169 | else: # multi-byte
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| 170 | if currange in Functs[name][1]:
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| 171 | raise Exception("range already defined in" \
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| 172 | " function")
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| 173 | else:
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| 174 | Functs[name][1].append(currange)
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| 175 |
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| 176 | except:
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| 177 | print("Failed to process line: %s" % (line))
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| 178 | raise
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| 179 | #
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| 180 | # At this point, the entire definition file has been processed. Now we
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| 181 | # enter the output phase, where we generate the two files chvalid.c and'
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| 182 | # chvalid.h
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| 183 | #
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| 184 | # To do this, we first output the 'static' data (heading, fixed
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| 185 | # definitions, etc.), then output the 'dynamic' data (the results
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| 186 | # of the above processing), and finally output closing 'static' data
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| 187 | # (e.g. the subroutine to process the ranges)
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| 188 | #
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| 189 |
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| 190 | #
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| 191 | # Generate the headings:
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| 192 | #
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| 193 | try:
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| 194 | header = open("include/libxml/chvalid.h", "w")
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| 195 | except:
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| 196 | print("Failed to open include/libxml/chvalid.h")
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| 197 | sys.exit(1)
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| 198 |
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| 199 | try:
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| 200 | output = open("chvalid.c", "w")
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| 201 | except:
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| 202 | print("Failed to open chvalid.c")
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| 203 | sys.exit(1)
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| 204 |
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| 205 | date = time.asctime(time.localtime(time.time()))
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| 206 |
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| 207 | header.write(
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| 208 | """/*
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| 209 | * Summary: Unicode character range checking
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| 210 | * Description: this module exports interfaces for the character
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| 211 | * range validation APIs
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| 212 | *
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| 213 | * This file is automatically generated from the cvs source
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| 214 | * definition files using the genChRanges.py Python script
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| 215 | *
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| 216 | * Generation date: %s
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| 217 | * Sources: %s
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| 218 | * Author: William Brack <wbrack@mmm.com.hk>
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| 219 | */
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| 220 |
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| 221 | #ifndef __XML_CHVALID_H__
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| 222 | #define __XML_CHVALID_H__
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| 223 |
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| 224 | #include <libxml/xmlversion.h>
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| 225 | #include <libxml/xmlstring.h>
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| 226 |
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| 227 | #ifdef __cplusplus
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| 228 | extern "C" {
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| 229 | #endif
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| 230 |
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| 231 | /*
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| 232 | * Define our typedefs and structures
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| 233 | *
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| 234 | */
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| 235 | typedef struct _xmlChSRange xmlChSRange;
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| 236 | typedef xmlChSRange *xmlChSRangePtr;
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| 237 | struct _xmlChSRange {
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| 238 | unsigned short\tlow;
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| 239 | unsigned short\thigh;
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| 240 | };
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| 241 |
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| 242 | typedef struct _xmlChLRange xmlChLRange;
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| 243 | typedef xmlChLRange *xmlChLRangePtr;
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| 244 | struct _xmlChLRange {
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| 245 | unsigned int\tlow;
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| 246 | unsigned int\thigh;
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| 247 | };
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| 248 |
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| 249 | typedef struct _xmlChRangeGroup xmlChRangeGroup;
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| 250 | typedef xmlChRangeGroup *xmlChRangeGroupPtr;
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| 251 | struct _xmlChRangeGroup {
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| 252 | int\t\t\tnbShortRange;
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| 253 | int\t\t\tnbLongRange;
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| 254 | const xmlChSRange\t*shortRange;\t/* points to an array of ranges */
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| 255 | const xmlChLRange\t*longRange;
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| 256 | };
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| 257 |
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| 258 | /**
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| 259 | * Range checking routine
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| 260 | */
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| 261 | XMLPUBFUN int
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| 262 | \t\txmlCharInRange(unsigned int val, const xmlChRangeGroup *group);
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| 263 |
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| 264 | """ % (date, sources));
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| 265 | output.write(
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| 266 | """/*
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| 267 | * chvalid.c:\tthis module implements the character range
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| 268 | *\t\tvalidation APIs
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| 269 | *
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| 270 | * This file is automatically generated from the cvs source
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| 271 | * definition files using the genChRanges.py Python script
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| 272 | *
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| 273 | * Generation date: %s
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| 274 | * Sources: %s
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| 275 | * William Brack <wbrack@mmm.com.hk>
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| 276 | */
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| 277 |
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| 278 | #define IN_LIBXML
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| 279 | #include "libxml.h"
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| 280 | #include <libxml/chvalid.h>
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| 281 |
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| 282 | #include <stddef.h>
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| 283 |
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| 284 | /*
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| 285 | * The initial tables ({func_name}_tab) are used to validate whether a
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| 286 | * single-byte character is within the specified group. Each table
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| 287 | * contains 256 bytes, with each byte representing one of the 256
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| 288 | * possible characters. If the table byte is set, the character is
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| 289 | * allowed.
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| 290 | *
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| 291 | */
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| 292 | """ % (date, sources));
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| 293 |
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| 294 | #
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| 295 | # Now output the generated data.
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| 296 | # We try to produce the best execution times. Tests have shown that validation
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| 297 | # with direct table lookup is, when there are a "small" number of valid items,
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| 298 | # still not as fast as a sequence of inline compares. So, if the single-byte
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| 299 | # portion of a range has a "small" number of ranges, we output a macro for inline
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| 300 | # compares, otherwise we output a 256-byte table and a macro to use it.
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| 301 | #
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| 302 |
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| 303 | fkeys = sorted(Functs.keys())
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| 304 |
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| 305 | for f in fkeys:
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| 306 |
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| 307 | # First we convert the specified single-byte values into a group of ranges.
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| 308 | # If the total number of such ranges is less than minTableSize, we generate
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| 309 | # an inline macro for direct comparisons; if greater, we generate a lookup
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| 310 | # table.
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| 311 | if max(Functs[f][0]) > 0: # only check if at least one entry
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| 312 | rangeTable = makeRange(Functs[f][0])
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| 313 | numRanges = len(rangeTable)
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| 314 | if numRanges >= minTableSize: # table is worthwhile
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| 315 | header.write("XMLPUBVAR const unsigned char %s_tab[256];\n" % f)
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| 316 | header.write("""
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| 317 | /**
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| 318 | * %s_ch:
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| 319 | * @c: char to validate
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| 320 | *
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| 321 | * Automatically generated by genChRanges.py
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| 322 | */
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| 323 | """ % f)
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| 324 | header.write("#define %s_ch(c)\t(%s_tab[(c)])\n" % (f, f))
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| 325 |
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| 326 | # write the constant data to the code file
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| 327 | output.write("const unsigned char %s_tab[256] = {\n" % f)
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| 328 | pline = " "
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| 329 | for n in range(255):
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| 330 | pline += " 0x%02x," % Functs[f][0][n]
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| 331 | if len(pline) > 72:
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| 332 | output.write(pline + "\n")
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| 333 | pline = " "
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| 334 | output.write(pline + " 0x%02x };\n\n" % Functs[f][0][255])
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| 335 |
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| 336 | else: # inline check is used
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| 337 | # first another little optimisation - if space is present,
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| 338 | # put it at the front of the list so it is checked first
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| 339 | try:
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| 340 | ix = rangeTable.remove((0x20, 0x20))
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| 341 | rangeTable.insert(0, (0x20, 0x20))
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| 342 | except:
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| 343 | pass
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| 344 | firstFlag = 1
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| 345 |
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| 346 | header.write("""
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| 347 | /**
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| 348 | * %s_ch:
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| 349 | * @c: char to validate
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| 350 | *
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| 351 | * Automatically generated by genChRanges.py
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| 352 | */
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| 353 | """ % f)
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| 354 | # okay, I'm tired of the messy lineup - let's automate it!
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| 355 | pline = "#define %s_ch(c)" % f
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| 356 | # 'ntab' is number of tabs needed to position to col. 33 from name end
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| 357 | ntab = 4 - (len(pline)) // 8
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| 358 | if ntab < 0:
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| 359 | ntab = 0
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| 360 | just = ""
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| 361 | for i in range(ntab):
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| 362 | just += "\t"
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| 363 | pline = pline + just + "("
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| 364 | for rg in rangeTable:
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| 365 | if not firstFlag:
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| 366 | pline += " || \\\n\t\t\t\t "
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| 367 | else:
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| 368 | firstFlag = 0
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| 369 | if rg[0] == rg[1]: # single value - check equal
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| 370 | pline += "((c) == 0x%x)" % rg[0]
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| 371 | else: # value range
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| 372 | # since we are doing char, also change range ending in 0xff
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| 373 | if rg[1] != 0xff:
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| 374 | pline += "((0x%x <= (c)) &&" % rg[0]
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| 375 | pline += " ((c) <= 0x%x))" % rg[1]
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| 376 | else:
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| 377 | pline += " (0x%x <= (c))" % rg[0]
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| 378 | pline += ")\n"
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| 379 | header.write(pline)
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| 380 |
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| 381 | header.write("""
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| 382 | /**
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| 383 | * %sQ:
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| 384 | * @c: char to validate
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| 385 | *
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| 386 | * Automatically generated by genChRanges.py
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| 387 | */
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| 388 | """ % f)
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| 389 | pline = "#define %sQ(c)" % f
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| 390 | ntab = 4 - (len(pline)) // 8
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| 391 | if ntab < 0:
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| 392 | ntab = 0
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| 393 | just = ""
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| 394 | for i in range(ntab):
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| 395 | just += "\t"
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| 396 | header.write(pline + just + "(((c) < 0x100) ? \\\n\t\t\t\t ")
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| 397 | if max(Functs[f][0]) > 0:
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| 398 | header.write("%s_ch((c)) :" % f)
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| 399 | else:
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| 400 | header.write("0 :")
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| 401 |
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| 402 | # if no ranges defined, value invalid if >= 0x100
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| 403 | numRanges = len(Functs[f][1])
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| 404 | if numRanges == 0:
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| 405 | header.write(" 0)\n\n")
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| 406 | else:
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| 407 | if numRanges >= minTableSize:
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| 408 | header.write(" \\\n\t\t\t\t xmlCharInRange((c), &%sGroup))\n\n" % f)
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| 409 | else: # if < minTableSize, generate inline code
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| 410 | firstFlag = 1
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| 411 | for rg in Functs[f][1]:
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| 412 | if not firstFlag:
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| 413 | pline += " || \\\n\t\t\t\t "
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| 414 | else:
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| 415 | firstFlag = 0
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| 416 | pline = "\\\n\t\t\t\t("
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| 417 | if rg[0] == rg[1]: # single value - check equal
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| 418 | pline += "((c) == 0x%x)" % rg[0]
|
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| 419 | else: # value range
|
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| 420 | pline += "((0x%x <= (c)) &&" % rg[0]
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| 421 | pline += " ((c) <= 0x%x))" % rg[1]
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| 422 | pline += "))\n\n"
|
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| 423 | header.write(pline)
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| 424 |
|
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| 425 |
|
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| 426 | if len(Functs[f][1]) > 0:
|
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| 427 | header.write("XMLPUBVAR const xmlChRangeGroup %sGroup;\n" % f)
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| 428 |
|
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| 429 |
|
|---|
| 430 | #
|
|---|
| 431 | # Next we do the unicode ranges
|
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| 432 | #
|
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| 433 |
|
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| 434 | for f in fkeys:
|
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| 435 | if len(Functs[f][1]) > 0: # only generate if unicode ranges present
|
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| 436 | rangeTable = Functs[f][1]
|
|---|
| 437 | rangeTable.sort() # ascending tuple sequence
|
|---|
| 438 | numShort = 0
|
|---|
| 439 | numLong = 0
|
|---|
| 440 | for rg in rangeTable:
|
|---|
| 441 | if rg[1] < 0x10000: # if short value
|
|---|
| 442 | if numShort == 0: # first occurrence
|
|---|
| 443 | pline = "static const xmlChSRange %s_srng[] = {" % f
|
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| 444 | else:
|
|---|
| 445 | pline += ","
|
|---|
| 446 | numShort += 1
|
|---|
| 447 | if len(pline) > 60:
|
|---|
| 448 | output.write(pline + "\n")
|
|---|
| 449 | pline = " "
|
|---|
| 450 | else:
|
|---|
| 451 | pline += " "
|
|---|
| 452 | pline += "{0x%x, 0x%x}" % (rg[0], rg[1])
|
|---|
| 453 | else: # if long value
|
|---|
| 454 | if numLong == 0: # first occurrence
|
|---|
| 455 | if numShort > 0: # if there were shorts, finish them off
|
|---|
| 456 | output.write(pline + "};\n")
|
|---|
| 457 | pline = "static const xmlChLRange %s_lrng[] = { " % f
|
|---|
| 458 | else:
|
|---|
| 459 | pline += ", "
|
|---|
| 460 | numLong += 1
|
|---|
| 461 | if len(pline) > 60:
|
|---|
| 462 | output.write(pline + "\n")
|
|---|
| 463 | pline = " "
|
|---|
| 464 | pline += "{0x%x, 0x%x}" % (rg[0], rg[1])
|
|---|
| 465 | output.write(pline + "};\n") # finish off last group
|
|---|
| 466 |
|
|---|
| 467 | pline = "const xmlChRangeGroup %sGroup =\n\t{%d, %d, " % (f, numShort, numLong)
|
|---|
| 468 | if numShort > 0:
|
|---|
| 469 | pline += "%s_srng" % f
|
|---|
| 470 | else:
|
|---|
| 471 | pline += "(xmlChSRangePtr)0"
|
|---|
| 472 | if numLong > 0:
|
|---|
| 473 | pline += ", %s_lrng" % f
|
|---|
| 474 | else:
|
|---|
| 475 | pline += ", (xmlChLRangePtr)0"
|
|---|
| 476 |
|
|---|
| 477 | output.write(pline + "};\n\n")
|
|---|
| 478 |
|
|---|
| 479 | output.write(
|
|---|
| 480 | """
|
|---|
| 481 | /**
|
|---|
| 482 | * xmlCharInRange:
|
|---|
| 483 | * @val: character to be validated
|
|---|
| 484 | * @rptr: pointer to range to be used to validate
|
|---|
| 485 | *
|
|---|
| 486 | * Does a binary search of the range table to determine if char
|
|---|
| 487 | * is valid
|
|---|
| 488 | *
|
|---|
| 489 | * Returns: true if character valid, false otherwise
|
|---|
| 490 | */
|
|---|
| 491 | int
|
|---|
| 492 | xmlCharInRange (unsigned int val, const xmlChRangeGroup *rptr) {
|
|---|
| 493 | int low, high, mid;
|
|---|
| 494 | const xmlChSRange *sptr;
|
|---|
| 495 | const xmlChLRange *lptr;
|
|---|
| 496 |
|
|---|
| 497 | if (rptr == NULL) return(0);
|
|---|
| 498 | if (val < 0x10000) {\t/* is val in 'short' or 'long' array? */
|
|---|
| 499 | \tif (rptr->nbShortRange == 0)
|
|---|
| 500 | \t return 0;
|
|---|
| 501 | \tlow = 0;
|
|---|
| 502 | \thigh = rptr->nbShortRange - 1;
|
|---|
| 503 | \tsptr = rptr->shortRange;
|
|---|
| 504 | \twhile (low <= high) {
|
|---|
| 505 | \t mid = (low + high) / 2;
|
|---|
| 506 | \t if ((unsigned short) val < sptr[mid].low) {
|
|---|
| 507 | \t\thigh = mid - 1;
|
|---|
| 508 | \t } else {
|
|---|
| 509 | \t\tif ((unsigned short) val > sptr[mid].high) {
|
|---|
| 510 | \t\t low = mid + 1;
|
|---|
| 511 | \t\t} else {
|
|---|
| 512 | \t\t return 1;
|
|---|
| 513 | \t\t}
|
|---|
| 514 | \t }
|
|---|
| 515 | \t}
|
|---|
| 516 | } else {
|
|---|
| 517 | \tif (rptr->nbLongRange == 0) {
|
|---|
| 518 | \t return 0;
|
|---|
| 519 | \t}
|
|---|
| 520 | \tlow = 0;
|
|---|
| 521 | \thigh = rptr->nbLongRange - 1;
|
|---|
| 522 | \tlptr = rptr->longRange;
|
|---|
| 523 | \twhile (low <= high) {
|
|---|
| 524 | \t mid = (low + high) / 2;
|
|---|
| 525 | \t if (val < lptr[mid].low) {
|
|---|
| 526 | \t\thigh = mid - 1;
|
|---|
| 527 | \t } else {
|
|---|
| 528 | \t\tif (val > lptr[mid].high) {
|
|---|
| 529 | \t\t low = mid + 1;
|
|---|
| 530 | \t\t} else {
|
|---|
| 531 | \t\t return 1;
|
|---|
| 532 | \t\t}
|
|---|
| 533 | \t }
|
|---|
| 534 | \t}
|
|---|
| 535 | }
|
|---|
| 536 | return 0;
|
|---|
| 537 | }
|
|---|
| 538 |
|
|---|
| 539 | """);
|
|---|
| 540 |
|
|---|
| 541 | #
|
|---|
| 542 | # finally, generate the ABI compatibility functions
|
|---|
| 543 | #
|
|---|
| 544 | for f in fkeys:
|
|---|
| 545 | output.write("""
|
|---|
| 546 | /**
|
|---|
| 547 | * %s:
|
|---|
| 548 | * @ch: character to validate
|
|---|
| 549 | *
|
|---|
| 550 | * This function is DEPRECATED.
|
|---|
| 551 | """ % f);
|
|---|
| 552 | if max(Functs[f][0]) > 0:
|
|---|
| 553 | output.write(" * Use %s_ch or %sQ instead" % (f, f))
|
|---|
| 554 | else:
|
|---|
| 555 | output.write(" * Use %sQ instead" % f)
|
|---|
| 556 | output.write("""
|
|---|
| 557 | *
|
|---|
| 558 | * Returns true if argument valid, false otherwise
|
|---|
| 559 | */
|
|---|
| 560 | """)
|
|---|
| 561 | output.write("int\n%s(unsigned int ch) {\n return(%sQ(ch));\n}\n\n" % (f,f))
|
|---|
| 562 | header.write("XMLPUBFUN int\n\t\t%s(unsigned int ch);\n" % f);
|
|---|
| 563 | #
|
|---|
| 564 | # Run complete - write trailers and close the output files
|
|---|
| 565 | #
|
|---|
| 566 |
|
|---|
| 567 | header.write("""
|
|---|
| 568 | #ifdef __cplusplus
|
|---|
| 569 | }
|
|---|
| 570 | #endif
|
|---|
| 571 | #endif /* __XML_CHVALID_H__ */
|
|---|
| 572 | """)
|
|---|
| 573 |
|
|---|
| 574 | header.close()
|
|---|
| 575 |
|
|---|
| 576 | output.close()
|
|---|
| 577 |
|
|---|
