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https://gitlab.gnome.org/GNOME/libxml2.git
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578 lines
18 KiB
Python
Executable File
578 lines
18 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Portions of this script have been (shamelessly) stolen from the
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# prior work of Daniel Veillard (genUnicode.py)
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#
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# I, however, take full credit for any bugs, errors or difficulties :-)
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#
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# William Brack
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# October 2003
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#
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# 18 October 2003
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# Modified to maintain binary compatibility with previous library versions
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# by adding a suffix 'Q' ('quick') to the macro generated for the original,
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# function, and adding generation of a function (with the original name) which
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# instantiates the macro.
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#
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import sys
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import time
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#
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# A routine to take a list of yes/no (1, 0) values and turn it
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# into a list of ranges. This will later be used to determine whether
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# to generate single-byte lookup tables, or inline comparisons
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#
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def makeRange(lst):
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ret = []
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pos = 0
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while pos < len(lst):
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try: # index generates exception if not present
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s = lst[pos:].index(1) # look for start of next range
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except:
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break # if no more, finished
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pos += s # pointer to start of possible range
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try:
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e = lst[pos:].index(0) # look for end of range
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e += pos
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except: # if no end, set to end of list
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e = len(lst)
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ret.append((pos, e-1)) # append range tuple to list
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pos = e + 1 # ready to check for next range
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return ret
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sources = "chvalid.def" # input filename
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# minTableSize gives the minimum number of ranges which must be present
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# before a 256-byte lookup table is produced. If there are less than this
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# number, a macro with inline comparisons is generated
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minTableSize = 6
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# dictionary of functions, key=name, element contains char-map and range-list
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Functs = {}
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state = 0
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try:
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defines = open("chvalid.def", "r")
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except:
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print("Missing chvalid.def, aborting ...")
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sys.exit(1)
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#
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# The lines in the .def file have three types:-
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# name: Defines a new function block
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# ur: Defines individual or ranges of unicode values
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# end: Indicates the end of the function block
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#
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# These lines are processed below.
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#
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for line in defines.readlines():
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# ignore blank lines, or lines beginning with '#'
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if line[0] == '#':
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continue
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line = line.strip()
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if line == '':
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continue
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# split line into space-separated fields, then split on type
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try:
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fields = line.split(' ')
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#
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# name line:
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# validate any previous function block already ended
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# validate this function not already defined
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# initialize an entry in the function dicitonary
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# including a mask table with no values yet defined
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#
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if fields[0] == 'name':
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name = fields[1]
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if state != 0:
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print("'name' %s found before previous name" \
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"completed" % (fields[1]))
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continue
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state = 1
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if name in Functs:
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print("name '%s' already present - may give" \
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" wrong results" % (name))
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else:
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# dict entry with two list elements (chdata, rangedata)
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Functs[name] = [ [], [] ]
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for v in range(256):
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Functs[name][0].append(0)
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#
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# end line:
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# validate there was a preceding function name line
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# set state to show no current function active
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#
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elif fields[0] == 'end':
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if state == 0:
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print("'end' found outside of function block")
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continue
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state = 0
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#
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# ur line:
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# validate function has been defined
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# process remaining fields on the line, which may be either
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# individual unicode values or ranges of values
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#
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elif fields[0] == 'ur':
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if state != 1:
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raise Exception("'ur' found outside of 'name' block")
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for el in fields[1:]:
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pos = el.find('..')
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# pos <=0 means not a range, so must be individual value
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if pos <= 0:
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# cheap handling of hex or decimal values
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if el[0:2] == '0x':
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value = int(el[2:],16)
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elif el[0] == "'":
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value = ord(el[1])
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else:
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value = int(el)
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if ((value < 0) | (value > 0x1fffff)):
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raise Exception('Illegal value (%s) in ch for'\
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' name %s' % (el,name))
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# for ur we have only ranges (makes things simpler),
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# so convert val to range
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currange = (value, value)
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# pos > 0 means this is a range, so isolate/validate
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# the interval
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else:
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# split the range into it's first-val, last-val
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(first, last) = el.split("..")
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# convert values from text into binary
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if first[0:2] == '0x':
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start = int(first[2:],16)
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elif first[0] == "'":
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start = ord(first[1])
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else:
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start = int(first)
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if last[0:2] == '0x':
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end = int(last[2:],16)
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elif last[0] == "'":
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end = ord(last[1])
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else:
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end = int(last)
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if (start < 0) | (end > 0x1fffff) | (start > end):
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raise Exception("Invalid range '%s'" % el)
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currange = (start, end)
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# common path - 'currange' has the range, now take care of it
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# We split on single-byte values vs. multibyte
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if currange[1] < 0x100: # single-byte
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for ch in range(currange[0],currange[1]+1):
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# validate that value not previously defined
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if Functs[name][0][ch]:
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msg = "Duplicate ch value '%s' for name '%s'" % (el, name)
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raise Exception(msg)
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Functs[name][0][ch] = 1
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else: # multi-byte
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if currange in Functs[name][1]:
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raise Exception("range already defined in" \
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" function")
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else:
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Functs[name][1].append(currange)
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except:
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print("Failed to process line: %s" % (line))
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raise
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#
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# At this point, the entire definition file has been processed. Now we
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# enter the output phase, where we generate the two files chvalid.c and'
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# chvalid.h
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#
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# To do this, we first output the 'static' data (heading, fixed
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# definitions, etc.), then output the 'dynamic' data (the results
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# of the above processing), and finally output closing 'static' data
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# (e.g. the subroutine to process the ranges)
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#
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#
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# Generate the headings:
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#
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try:
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header = open("include/libxml/chvalid.h", "w")
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except:
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print("Failed to open include/libxml/chvalid.h")
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sys.exit(1)
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try:
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output = open("chvalid.c", "w")
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except:
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print("Failed to open chvalid.c")
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sys.exit(1)
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date = time.asctime(time.localtime(time.time()))
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header.write(
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"""/*
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* Summary: Unicode character range checking
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* Description: this module exports interfaces for the character
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* range validation APIs
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*
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* This file is automatically generated from the cvs source
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* definition files using the genChRanges.py Python script
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*
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* Generation date: %s
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* Sources: %s
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* Author: William Brack <wbrack@mmm.com.hk>
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*/
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#ifndef __XML_CHVALID_H__
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#define __XML_CHVALID_H__
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#include <libxml/xmlversion.h>
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#include <libxml/xmlstring.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Define our typedefs and structures
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*
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*/
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typedef struct _xmlChSRange xmlChSRange;
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typedef xmlChSRange *xmlChSRangePtr;
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struct _xmlChSRange {
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unsigned short\tlow;
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unsigned short\thigh;
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};
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typedef struct _xmlChLRange xmlChLRange;
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typedef xmlChLRange *xmlChLRangePtr;
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struct _xmlChLRange {
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unsigned int\tlow;
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unsigned int\thigh;
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};
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typedef struct _xmlChRangeGroup xmlChRangeGroup;
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typedef xmlChRangeGroup *xmlChRangeGroupPtr;
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struct _xmlChRangeGroup {
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int\t\t\tnbShortRange;
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int\t\t\tnbLongRange;
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const xmlChSRange\t*shortRange;\t/* points to an array of ranges */
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const xmlChLRange\t*longRange;
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};
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/**
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* Range checking routine
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*/
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XMLPUBFUN int
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\t\txmlCharInRange(unsigned int val, const xmlChRangeGroup *group);
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""" % (date, sources));
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output.write(
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"""/*
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* chvalid.c:\tthis module implements the character range
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*\t\tvalidation APIs
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*
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* This file is automatically generated from the cvs source
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* definition files using the genChRanges.py Python script
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*
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* Generation date: %s
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* Sources: %s
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* William Brack <wbrack@mmm.com.hk>
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*/
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#define IN_LIBXML
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#include "libxml.h"
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#include <libxml/chvalid.h>
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#include <stddef.h>
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/*
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* The initial tables ({func_name}_tab) are used to validate whether a
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* single-byte character is within the specified group. Each table
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* contains 256 bytes, with each byte representing one of the 256
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* possible characters. If the table byte is set, the character is
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* allowed.
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*
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*/
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""" % (date, sources));
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#
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# Now output the generated data.
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# We try to produce the best execution times. Tests have shown that validation
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# with direct table lookup is, when there are a "small" number of valid items,
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# still not as fast as a sequence of inline compares. So, if the single-byte
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# portion of a range has a "small" number of ranges, we output a macro for inline
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# compares, otherwise we output a 256-byte table and a macro to use it.
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#
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fkeys = sorted(Functs.keys())
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for f in fkeys:
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# First we convert the specified single-byte values into a group of ranges.
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# If the total number of such ranges is less than minTableSize, we generate
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# an inline macro for direct comparisons; if greater, we generate a lookup
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# table.
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if max(Functs[f][0]) > 0: # only check if at least one entry
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rangeTable = makeRange(Functs[f][0])
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numRanges = len(rangeTable)
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if numRanges >= minTableSize: # table is worthwhile
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header.write("XMLPUBVAR const unsigned char %s_tab[256];\n" % f)
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header.write("""
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/**
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* %s_ch:
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* @c: char to validate
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*
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* Automatically generated by genChRanges.py
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*/
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""" % f)
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header.write("#define %s_ch(c)\t(%s_tab[(c)])\n" % (f, f))
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# write the constant data to the code file
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output.write("const unsigned char %s_tab[256] = {\n" % f)
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pline = " "
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for n in range(255):
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pline += " 0x%02x," % Functs[f][0][n]
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if len(pline) > 72:
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output.write(pline + "\n")
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pline = " "
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output.write(pline + " 0x%02x };\n\n" % Functs[f][0][255])
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else: # inline check is used
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# first another little optimisation - if space is present,
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# put it at the front of the list so it is checked first
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try:
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ix = rangeTable.remove((0x20, 0x20))
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rangeTable.insert(0, (0x20, 0x20))
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except:
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pass
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firstFlag = 1
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header.write("""
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/**
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* %s_ch:
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* @c: char to validate
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*
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* Automatically generated by genChRanges.py
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*/
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""" % f)
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# okay, I'm tired of the messy lineup - let's automate it!
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pline = "#define %s_ch(c)" % f
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# 'ntab' is number of tabs needed to position to col. 33 from name end
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ntab = 4 - (len(pline)) // 8
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if ntab < 0:
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ntab = 0
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just = ""
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for i in range(ntab):
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just += "\t"
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pline = pline + just + "("
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for rg in rangeTable:
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if not firstFlag:
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pline += " || \\\n\t\t\t\t "
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else:
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firstFlag = 0
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if rg[0] == rg[1]: # single value - check equal
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pline += "((c) == 0x%x)" % rg[0]
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else: # value range
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# since we are doing char, also change range ending in 0xff
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if rg[1] != 0xff:
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pline += "((0x%x <= (c)) &&" % rg[0]
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pline += " ((c) <= 0x%x))" % rg[1]
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else:
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pline += " (0x%x <= (c))" % rg[0]
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pline += ")\n"
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header.write(pline)
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header.write("""
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/**
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* %sQ:
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* @c: char to validate
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*
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* Automatically generated by genChRanges.py
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*/
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""" % f)
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pline = "#define %sQ(c)" % f
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ntab = 4 - (len(pline)) // 8
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if ntab < 0:
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ntab = 0
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just = ""
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for i in range(ntab):
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just += "\t"
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header.write(pline + just + "(((c) < 0x100) ? \\\n\t\t\t\t ")
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if max(Functs[f][0]) > 0:
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header.write("%s_ch((c)) :" % f)
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else:
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header.write("0 :")
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# if no ranges defined, value invalid if >= 0x100
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numRanges = len(Functs[f][1])
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if numRanges == 0:
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header.write(" 0)\n\n")
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else:
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if numRanges >= minTableSize:
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header.write(" \\\n\t\t\t\t xmlCharInRange((c), &%sGroup))\n\n" % f)
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else: # if < minTableSize, generate inline code
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firstFlag = 1
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for rg in Functs[f][1]:
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if not firstFlag:
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pline += " || \\\n\t\t\t\t "
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else:
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firstFlag = 0
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pline = "\\\n\t\t\t\t("
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if rg[0] == rg[1]: # single value - check equal
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pline += "((c) == 0x%x)" % rg[0]
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else: # value range
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pline += "((0x%x <= (c)) &&" % rg[0]
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pline += " ((c) <= 0x%x))" % rg[1]
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pline += "))\n\n"
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header.write(pline)
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if len(Functs[f][1]) > 0:
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header.write("XMLPUBVAR const xmlChRangeGroup %sGroup;\n" % f)
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#
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# Next we do the unicode ranges
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#
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for f in fkeys:
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if len(Functs[f][1]) > 0: # only generate if unicode ranges present
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rangeTable = Functs[f][1]
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rangeTable.sort() # ascending tuple sequence
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numShort = 0
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numLong = 0
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for rg in rangeTable:
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if rg[1] < 0x10000: # if short value
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if numShort == 0: # first occurrence
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pline = "static const xmlChSRange %s_srng[] = {" % f
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else:
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pline += ","
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numShort += 1
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if len(pline) > 60:
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output.write(pline + "\n")
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pline = " "
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else:
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pline += " "
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pline += "{0x%x, 0x%x}" % (rg[0], rg[1])
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else: # if long value
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if numLong == 0: # first occurrence
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if numShort > 0: # if there were shorts, finish them off
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output.write(pline + "};\n")
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pline = "static const xmlChLRange %s_lrng[] = { " % f
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else:
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pline += ", "
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numLong += 1
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if len(pline) > 60:
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output.write(pline + "\n")
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pline = " "
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pline += "{0x%x, 0x%x}" % (rg[0], rg[1])
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output.write(pline + "};\n") # finish off last group
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pline = "const xmlChRangeGroup %sGroup =\n\t{%d, %d, " % (f, numShort, numLong)
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if numShort > 0:
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pline += "%s_srng" % f
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else:
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pline += "(xmlChSRangePtr)0"
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if numLong > 0:
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pline += ", %s_lrng" % f
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else:
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pline += ", (xmlChLRangePtr)0"
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output.write(pline + "};\n\n")
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output.write(
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"""
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/**
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* xmlCharInRange:
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* @val: character to be validated
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* @rptr: pointer to range to be used to validate
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*
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* Does a binary search of the range table to determine if char
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* is valid
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*
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* Returns: true if character valid, false otherwise
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*/
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int
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xmlCharInRange (unsigned int val, const xmlChRangeGroup *rptr) {
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int low, high, mid;
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const xmlChSRange *sptr;
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const xmlChLRange *lptr;
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if (rptr == NULL) return(0);
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if (val < 0x10000) {\t/* is val in 'short' or 'long' array? */
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\tif (rptr->nbShortRange == 0)
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\t return 0;
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\tlow = 0;
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\thigh = rptr->nbShortRange - 1;
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\tsptr = rptr->shortRange;
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\twhile (low <= high) {
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\t mid = (low + high) / 2;
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\t if ((unsigned short) val < sptr[mid].low) {
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\t\thigh = mid - 1;
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\t } else {
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\t\tif ((unsigned short) val > sptr[mid].high) {
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\t\t low = mid + 1;
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\t\t} else {
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\t\t return 1;
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\t\t}
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\t }
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\t}
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} else {
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\tif (rptr->nbLongRange == 0) {
|
|
\t return 0;
|
|
\t}
|
|
\tlow = 0;
|
|
\thigh = rptr->nbLongRange - 1;
|
|
\tlptr = rptr->longRange;
|
|
\twhile (low <= high) {
|
|
\t mid = (low + high) / 2;
|
|
\t if (val < lptr[mid].low) {
|
|
\t\thigh = mid - 1;
|
|
\t } else {
|
|
\t\tif (val > lptr[mid].high) {
|
|
\t\t low = mid + 1;
|
|
\t\t} else {
|
|
\t\t return 1;
|
|
\t\t}
|
|
\t }
|
|
\t}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
""");
|
|
|
|
#
|
|
# finally, generate the ABI compatibility functions
|
|
#
|
|
for f in fkeys:
|
|
output.write("""
|
|
/**
|
|
* %s:
|
|
* @ch: character to validate
|
|
*
|
|
* This function is DEPRECATED.
|
|
""" % f);
|
|
if max(Functs[f][0]) > 0:
|
|
output.write(" * Use %s_ch or %sQ instead" % (f, f))
|
|
else:
|
|
output.write(" * Use %sQ instead" % f)
|
|
output.write("""
|
|
*
|
|
* Returns true if argument valid, false otherwise
|
|
*/
|
|
""")
|
|
output.write("int\n%s(unsigned int ch) {\n return(%sQ(ch));\n}\n\n" % (f,f))
|
|
header.write("XMLPUBFUN int\n\t\t%s(unsigned int ch);\n" % f);
|
|
#
|
|
# Run complete - write trailers and close the output files
|
|
#
|
|
|
|
header.write("""
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* __XML_CHVALID_H__ */
|
|
""")
|
|
|
|
header.close()
|
|
|
|
output.close()
|
|
|