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annotate m4/ax_compare_version.m4 @ 20770:c1a6c31ac29a

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eliminate more simple uses of error_state * ov-classdef.cc: Eliminate simple uses of error_state.
author John W. Eaton <jwe@octave.org>
date Tue, 06 Oct 2015 00:20:02 -0400
parents a44ff4f0a20b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
15170
a44ff4f0a20b Add AX_COMPARE_VERSION.m4 macro m4/ dir to make configure.ac simpler.
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1 # ===========================================================================
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2 # http://www.gnu.org/software/autoconf-archive/ax_compare_version.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
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8 #
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9 # DESCRIPTION
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10 #
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11 # This macro compares two version strings. Due to the various number of
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12 # minor-version numbers that can exist, and the fact that string
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13 # comparisons are not compatible with numeric comparisons, this is not
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14 # necessarily trivial to do in a autoconf script. This macro makes doing
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15 # these comparisons easy.
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16 #
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17 # The six basic comparisons are available, as well as checking equality
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18 # limited to a certain number of minor-version levels.
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19 #
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20 # The operator OP determines what type of comparison to do, and can be one
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21 # of:
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22 #
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23 # eq - equal (test A == B)
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24 # ne - not equal (test A != B)
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25 # le - less than or equal (test A <= B)
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26 # ge - greater than or equal (test A >= B)
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27 # lt - less than (test A < B)
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28 # gt - greater than (test A > B)
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29 #
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30 # Additionally, the eq and ne operator can have a number after it to limit
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31 # the test to that number of minor versions.
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32 #
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33 # eq0 - equal up to the length of the shorter version
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34 # ne0 - not equal up to the length of the shorter version
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35 # eqN - equal up to N sub-version levels
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36 # neN - not equal up to N sub-version levels
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37 #
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38 # When the condition is true, shell commands ACTION-IF-TRUE are run,
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39 # otherwise shell commands ACTION-IF-FALSE are run. The environment
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40 # variable 'ax_compare_version' is always set to either 'true' or 'false'
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41 # as well.
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42 #
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43 # Examples:
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44 #
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45 # AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
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46 # AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
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47 #
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48 # would both be true.
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49 #
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50 # AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
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51 # AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
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52 #
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53 # would both be false.
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54 #
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55 # AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
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56 #
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57 # would be true because it is only comparing two minor versions.
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58 #
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59 # AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
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60 #
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61 # would be true because it is only comparing the lesser number of minor
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62 # versions of the two values.
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63 #
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64 # Note: The characters that separate the version numbers do not matter. An
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65 # empty string is the same as version 0. OP is evaluated by autoconf, not
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66 # configure, so must be a string, not a variable.
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67 #
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68 # The author would like to acknowledge Guido Draheim whose advice about
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69 # the m4_case and m4_ifvaln functions make this macro only include the
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70 # portions necessary to perform the specific comparison specified by the
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71 # OP argument in the final configure script.
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72 #
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73 # LICENSE
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74 #
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75 # Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
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76 #
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77 # Copying and distribution of this file, with or without modification, are
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78 # permitted in any medium without royalty provided the copyright notice
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79 # and this notice are preserved. This file is offered as-is, without any
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80 # warranty.
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81
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82 #serial 11
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83
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84 dnl #########################################################################
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85 AC_DEFUN([AX_COMPARE_VERSION], [
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86 AC_REQUIRE([AC_PROG_AWK])
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87
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88 # Used to indicate true or false condition
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89 ax_compare_version=false
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90
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91 # Convert the two version strings to be compared into a format that
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92 # allows a simple string comparison. The end result is that a version
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93 # string of the form 1.12.5-r617 will be converted to the form
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94 # 0001001200050617. In other words, each number is zero padded to four
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95 # digits, and non digits are removed.
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96 AS_VAR_PUSHDEF([A],[ax_compare_version_A])
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97 A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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98 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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99 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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100 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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101 -e 's/[[^0-9]]//g'`
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102
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103 AS_VAR_PUSHDEF([B],[ax_compare_version_B])
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104 B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
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105 -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
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106 -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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107 -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
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108 -e 's/[[^0-9]]//g'`
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109
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110 dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
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111 dnl # then the first line is used to determine if the condition is true.
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112 dnl # The sed right after the echo is to remove any indented white space.
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113 m4_case(m4_tolower($2),
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114 [lt],[
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115 ax_compare_version=`echo "x$A
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116 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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117 ],
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118 [gt],[
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119 ax_compare_version=`echo "x$A
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120 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
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121 ],
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122 [le],[
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123 ax_compare_version=`echo "x$A
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124 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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125 ],
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126 [ge],[
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127 ax_compare_version=`echo "x$A
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128 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
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129 ],[
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130 dnl Split the operator from the subversion count if present.
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131 m4_bmatch(m4_substr($2,2),
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132 [0],[
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133 # A count of zero means use the length of the shorter version.
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134 # Determine the number of characters in A and B.
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135 ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
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136 ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
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137
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138 # Set A to no more than B's length and B to no more than A's length.
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139 A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
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140 B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
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141 ],
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142 [[0-9]+],[
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143 # A count greater than zero means use only that many subversions
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144 A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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145 B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
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146 ],
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147 [.+],[
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148 AC_WARNING(
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149 [illegal OP numeric parameter: $2])
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150 ],[])
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151
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152 # Pad zeros at end of numbers to make same length.
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153 ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
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154 B="$B`echo $A | sed 's/./0/g'`"
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155 A="$ax_compare_version_tmp_A"
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156
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157 # Check for equality or inequality as necessary.
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158 m4_case(m4_tolower(m4_substr($2,0,2)),
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159 [eq],[
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160 test "x$A" = "x$B" && ax_compare_version=true
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161 ],
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162 [ne],[
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163 test "x$A" != "x$B" && ax_compare_version=true
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164 ],[
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165 AC_WARNING([illegal OP parameter: $2])
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166 ])
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167 ])
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168
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169 AS_VAR_POPDEF([A])dnl
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170 AS_VAR_POPDEF([B])dnl
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171
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172 dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
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173 if test "$ax_compare_version" = "true" ; then
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174 m4_ifvaln([$4],[$4],[:])dnl
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175 m4_ifvaln([$5],[else $5])dnl
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176 fi
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177 ]) dnl AX_COMPARE_VERSION