Annotation of freem/m4/m4_ax_compare_version.m4, revision 1.1.1.1
1.1 snw 1: # ===========================================================================
2: # https://www.gnu.org/software/autoconf-archive/ax_compare_version.html
3: # ===========================================================================
4: #
5: # SYNOPSIS
6: #
7: # AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
8: #
9: # DESCRIPTION
10: #
11: # This macro compares two version strings. Due to the various number of
12: # minor-version numbers that can exist, and the fact that string
13: # comparisons are not compatible with numeric comparisons, this is not
14: # necessarily trivial to do in a autoconf script. This macro makes doing
15: # these comparisons easy.
16: #
17: # The six basic comparisons are available, as well as checking equality
18: # limited to a certain number of minor-version levels.
19: #
20: # The operator OP determines what type of comparison to do, and can be one
21: # of:
22: #
23: # eq - equal (test A == B)
24: # ne - not equal (test A != B)
25: # le - less than or equal (test A <= B)
26: # ge - greater than or equal (test A >= B)
27: # lt - less than (test A < B)
28: # gt - greater than (test A > B)
29: #
30: # Additionally, the eq and ne operator can have a number after it to limit
31: # the test to that number of minor versions.
32: #
33: # eq0 - equal up to the length of the shorter version
34: # ne0 - not equal up to the length of the shorter version
35: # eqN - equal up to N sub-version levels
36: # neN - not equal up to N sub-version levels
37: #
38: # When the condition is true, shell commands ACTION-IF-TRUE are run,
39: # otherwise shell commands ACTION-IF-FALSE are run. The environment
40: # variable 'ax_compare_version' is always set to either 'true' or 'false'
41: # as well.
42: #
43: # Examples:
44: #
45: # AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
46: # AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
47: #
48: # would both be true.
49: #
50: # AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
51: # AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
52: #
53: # would both be false.
54: #
55: # AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
56: #
57: # would be true because it is only comparing two minor versions.
58: #
59: # AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
60: #
61: # would be true because it is only comparing the lesser number of minor
62: # versions of the two values.
63: #
64: # Note: The characters that separate the version numbers do not matter. An
65: # empty string is the same as version 0. OP is evaluated by autoconf, not
66: # configure, so must be a string, not a variable.
67: #
68: # The author would like to acknowledge Guido Draheim whose advice about
69: # the m4_case and m4_ifvaln functions make this macro only include the
70: # portions necessary to perform the specific comparison specified by the
71: # OP argument in the final configure script.
72: #
73: # LICENSE
74: #
75: # Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
76: #
77: # Copying and distribution of this file, with or without modification, are
78: # permitted in any medium without royalty provided the copyright notice
79: # and this notice are preserved. This file is offered as-is, without any
80: # warranty.
81:
82: #serial 13
83:
84: dnl #########################################################################
85: AC_DEFUN([AX_COMPARE_VERSION], [
86: AC_REQUIRE([AC_PROG_AWK])
87:
88: # Used to indicate true or false condition
89: ax_compare_version=false
90:
91: # Convert the two version strings to be compared into a format that
92: # allows a simple string comparison. The end result is that a version
93: # string of the form 1.12.5-r617 will be converted to the form
94: # 0001001200050617. In other words, each number is zero padded to four
95: # digits, and non digits are removed.
96: AS_VAR_PUSHDEF([A],[ax_compare_version_A])
97: A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
98: -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
99: -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
100: -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
101: -e 's/[[^0-9]]//g'`
102:
103: AS_VAR_PUSHDEF([B],[ax_compare_version_B])
104: B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
105: -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
106: -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
107: -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
108: -e 's/[[^0-9]]//g'`
109:
110: dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
111: dnl # then the first line is used to determine if the condition is true.
112: dnl # The sed right after the echo is to remove any indented white space.
113: m4_case(m4_tolower($2),
114: [lt],[
115: ax_compare_version=`echo "x$A
116: x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
117: ],
118: [gt],[
119: ax_compare_version=`echo "x$A
120: x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
121: ],
122: [le],[
123: ax_compare_version=`echo "x$A
124: x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
125: ],
126: [ge],[
127: ax_compare_version=`echo "x$A
128: x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
129: ],[
130: dnl Split the operator from the subversion count if present.
131: m4_bmatch(m4_substr($2,2),
132: [0],[
133: # A count of zero means use the length of the shorter version.
134: # Determine the number of characters in A and B.
135: ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
136: ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
137:
138: # Set A to no more than B's length and B to no more than A's length.
139: A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
140: B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
141: ],
142: [[0-9]+],[
143: # A count greater than zero means use only that many subversions
144: A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
145: B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
146: ],
147: [.+],[
148: AC_WARNING(
149: [invalid OP numeric parameter: $2])
150: ],[])
151:
152: # Pad zeros at end of numbers to make same length.
153: ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
154: B="$B`echo $A | sed 's/./0/g'`"
155: A="$ax_compare_version_tmp_A"
156:
157: # Check for equality or inequality as necessary.
158: m4_case(m4_tolower(m4_substr($2,0,2)),
159: [eq],[
160: test "x$A" = "x$B" && ax_compare_version=true
161: ],
162: [ne],[
163: test "x$A" != "x$B" && ax_compare_version=true
164: ],[
165: AC_WARNING([invalid OP parameter: $2])
166: ])
167: ])
168:
169: AS_VAR_POPDEF([A])dnl
170: AS_VAR_POPDEF([B])dnl
171:
172: dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
173: if test "$ax_compare_version" = "true" ; then
174: m4_ifvaln([$4],[$4],[:])dnl
175: m4_ifvaln([$5],[else $5])dnl
176: fi
177: ]) dnl AX_COMPARE_VERSION
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