summaryrefslogtreecommitdiff
blob: ab512bd24e47bfdccbc6084dc27ad214b22ff7c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: eapi7-ver.eclass
# @MAINTAINER:
# PMS team <pms@gentoo.org>
# @AUTHOR:
# Ulrich Müller <ulm@gentoo.org>
# Michał Górny <mgorny@gentoo.org>
# @BLURB: Testing implementation of EAPI 7 version manipulators
# @DESCRIPTION:
# A stand-alone implementation of the version manipulation functions
# aimed for EAPI 7.  Intended to be used for wider testing of
# the proposed functions and to allow ebuilds to switch to the new
# model early, with minimal change needed for actual EAPI 7.
#
# https://bugs.gentoo.org/482170
#
# @ROFF .SS
# Version strings
#
# The functions support arbitrary version strings consisting of version
# components interspersed with (possibly empty) version separators.
#
# A version component can either consist purely of digits ([0-9]+)
# or purely of uppercase and lowercase letters ([A-Za-z]+).  A version
# separator is either a string of any other characters ([^A-Za-z0-9]+),
# or it occurs at the transition between a sequence of letters
# and a sequence of digits, or vice versa.  In the latter case,
# the version separator is an empty string.
#
# The version is processed left-to-right, and each successive component
# is assigned numbers starting with 1.  The components are either split
# on version separators or on boundaries between digits and letters
# (in which case the separator between the components is empty).
# Version separators are assigned numbers starting with 1 for
# the separator between 1st and 2nd components.  As a special case,
# if the version string starts with a separator, it is assigned index 0.
#
# Examples:
#
# @CODE
#   1.2b-alpha4 -> 1 . 2 '' b - alpha '' 4
#                  c s c s  c s c     s  c
#                  1 1 2 2  3 3 4     4  5
#
#   .11.        -> . 11 .
#                  s c  s
#                  0 1  1
# @CODE
#
# @ROFF .SS
# Ranges
#
# A range can be specified as 'm' for m-th version component, 'm-'
# for all components starting with m-th or 'm-n' for components starting
# at m-th and ending at n-th (inclusive).  If the range spans outside
# the version string, it is truncated silently.

case ${EAPI:-0} in
	0|1|2|3|4|5|6) ;;
	7) die "${ECLASS}: EAPI=${EAPI} includes all functions from this eclass" ;;
	*) die "${ECLASS}: EAPI=${EAPI} unknown" ;;
esac

# @FUNCTION: _ver_parse_range
# @USAGE: <range> <max>
# @INTERNAL
# @DESCRIPTION:
# Parse the range string <range>, setting 'start' and 'end' variables
# to the appropriate bounds.  <max> specifies the appropriate upper
# bound for the range; the user-specified value is truncated to this.
_ver_parse_range() {
	local range=${1}
	local max=${2}

	[[ ${range} == [0-9]* ]] \
		|| die "${FUNCNAME}: range must start with a number"
	start=${range%-*}
	[[ ${range} == *-* ]] && end=${range#*-} || end=${start}
	if [[ ${end} ]]; then
		[[ ${start} -le ${end} ]] \
			|| die "${FUNCNAME}: end of range must be >= start"
		[[ ${end} -le ${max} ]] || end=${max}
	else
		end=${max}
	fi
}

# @FUNCTION: _ver_split
# @USAGE: <version>
# @INTERNAL
# @DESCRIPTION:
# Split the version string <version> into separator-component array.
# Sets 'comp' to an array of the form: ( s_0 c_1 s_1 c_2 s_2 c_3... )
# where s_i are separators and c_i are components.
_ver_split() {
	local v=${1} LC_ALL=C

	comp=()

	# get separators and components
	local s c
	while [[ ${v} ]]; do
		# cut the separator
		s=${v%%[a-zA-Z0-9]*}
		v=${v:${#s}}
		# cut the next component; it can be either digits or letters
		[[ ${v} == [0-9]* ]] && c=${v%%[^0-9]*} || c=${v%%[^a-zA-Z]*}
		v=${v:${#c}}

		comp+=( "${s}" "${c}" )
	done
}

# @FUNCTION: ver_cut
# @USAGE: <range> [<version>]
# @DESCRIPTION:
# Print the substring of the version string containing components
# defined by the <range> and the version separators between them.
# Processes <version> if specified, ${PV} otherwise.
#
# For the syntax of versions and ranges, please see the eclass
# description.
ver_cut() {
	local range=${1}
	local v=${2:-${PV}}
	local start end
	local -a comp

	_ver_split "${v}"
	local max=$((${#comp[@]}/2))
	_ver_parse_range "${range}" "${max}"

	if [[ ${start} -gt 0 ]]; then
		start=$(( start*2 - 1 ))
	fi
	# Work around a bug in bash-3.2, where "${comp[*]:start:end*2-start}"
	# inserts stray 0x7f characters for empty array elements
	printf "%s" "${comp[@]:start:end*2-start}" $'\n'
}

# @FUNCTION: ver_rs
# @USAGE: <range> <repl> [<range> <repl>...] [<version>]
# @DESCRIPTION:
# Print the version string after substituting the specified version
# separators at <range> with <repl> (string).  Multiple '<range> <repl>'
# pairs can be specified.  Processes <version> if specified,
# ${PV} otherwise.
#
# For the syntax of versions and ranges, please see the eclass
# description.
ver_rs() {
	local v
	(( ${#} & 1 )) && v=${@: -1} || v=${PV}
	local start end i
	local -a comp

	_ver_split "${v}"
	local max=$((${#comp[@]}/2 - 1))

	while [[ ${#} -ge 2 ]]; do
		_ver_parse_range "${1}" "${max}"
		for (( i = start*2; i <= end*2; i+=2 )); do
			[[ ${i} -eq 0 && -z ${comp[i]} ]] && continue
			comp[i]=${2}
		done
		shift 2
	done

	local IFS=
	echo "${comp[*]}"
}

# @FUNCTION: _ver_compare_int
# @USAGE: <a> <b>
# @RETURN: 0 if <a> -eq <b>, 1 if <a> -lt <b>, 3 if <a> -gt <b>
# @INTERNAL
# @DESCRIPTION:
# Compare two non-negative integers <a> and <b>, of arbitrary length.
# If <a> is equal to, less than, or greater than <b>, return 0, 1, or 3
# as exit status, respectively.
_ver_compare_int() {
	local a=$1 b=$2 d=$(( ${#1}-${#2} ))

	# Zero-pad to equal length if necessary.
	if [[ ${d} -gt 0 ]]; then
		printf -v b "%0${d}d%s" 0 "${b}"
	elif [[ ${d} -lt 0 ]]; then
		printf -v a "%0$(( -d ))d%s" 0 "${a}"
	fi

	[[ ${a} > ${b} ]] && return 3
	[[ ${a} == "${b}" ]]
}

# @FUNCTION: _ver_compare
# @USAGE: <va> <vb>
# @RETURN: 1 if <va> < <vb>, 2 if <va> = <vb>, 3 if <va> > <vb>
# @INTERNAL
# @DESCRIPTION:
# Compare two versions <va> and <vb>.  If <va> is less than, equal to,
# or greater than <vb>, return 1, 2, or 3 as exit status, respectively.
_ver_compare() {
	local va=${1} vb=${2} a an al as ar b bn bl bs br re LC_ALL=C

	re="^([0-9]+(\.[0-9]+)*)([a-z]?)((_(alpha|beta|pre|rc|p)[0-9]*)*)(-r[0-9]+)?$"

	[[ ${va} =~ ${re} ]] || die "${FUNCNAME}: invalid version: ${va}"
	an=${BASH_REMATCH[1]}
	al=${BASH_REMATCH[3]}
	as=${BASH_REMATCH[4]}
	ar=${BASH_REMATCH[7]}

	[[ ${vb} =~ ${re} ]] || die "${FUNCNAME}: invalid version: ${vb}"
	bn=${BASH_REMATCH[1]}
	bl=${BASH_REMATCH[3]}
	bs=${BASH_REMATCH[4]}
	br=${BASH_REMATCH[7]}

	# Compare numeric components (PMS algorithm 3.2)
	# First component
	_ver_compare_int "${an%%.*}" "${bn%%.*}" || return

	while [[ ${an} == *.* && ${bn} == *.* ]]; do
		# Other components (PMS algorithm 3.3)
		an=${an#*.}
		bn=${bn#*.}
		a=${an%%.*}
		b=${bn%%.*}
		if [[ ${a} == 0* || ${b} == 0* ]]; then
			# Remove any trailing zeros
			[[ ${a} =~ 0+$ ]] && a=${a%"${BASH_REMATCH[0]}"}
			[[ ${b} =~ 0+$ ]] && b=${b%"${BASH_REMATCH[0]}"}
			[[ ${a} > ${b} ]] && return 3
			[[ ${a} < ${b} ]] && return 1
		else
			_ver_compare_int "${a}" "${b}" || return
		fi
	done
	[[ ${an} == *.* ]] && return 3
	[[ ${bn} == *.* ]] && return 1

	# Compare letter components (PMS algorithm 3.4)
	[[ ${al} > ${bl} ]] && return 3
	[[ ${al} < ${bl} ]] && return 1

	# Compare suffixes (PMS algorithm 3.5)
	as=${as#_}${as:+_}
	bs=${bs#_}${bs:+_}
	while [[ -n ${as} && -n ${bs} ]]; do
		# Compare each suffix (PMS algorithm 3.6)
		a=${as%%_*}
		b=${bs%%_*}
		if [[ ${a%%[0-9]*} == "${b%%[0-9]*}" ]]; then
			_ver_compare_int "${a##*[a-z]}" "${b##*[a-z]}" || return
		else
			# Check for p first
			[[ ${a%%[0-9]*} == p ]] && return 3
			[[ ${b%%[0-9]*} == p ]] && return 1
			# Hack: Use that alpha < beta < pre < rc alphabetically
			[[ ${a} > ${b} ]] && return 3 || return 1
		fi
		as=${as#*_}
		bs=${bs#*_}
	done
	if [[ -n ${as} ]]; then
		[[ ${as} == p[_0-9]* ]] && return 3 || return 1
	elif [[ -n ${bs} ]]; then
		[[ ${bs} == p[_0-9]* ]] && return 1 || return 3
	fi

	# Compare revision components (PMS algorithm 3.7)
	_ver_compare_int "${ar#-r}" "${br#-r}" || return

	return 2
}

# @FUNCTION: ver_test
# @USAGE: [<v1>] <op> <v2>
# @DESCRIPTION:
# Check if the relation <v1> <op> <v2> is true.  If <v1> is not specified,
# default to ${PVR}.  <op> can be -gt, -ge, -eq, -ne, -le, -lt.
# Both versions must conform to the PMS version syntax (with optional
# revision parts), and the comparison is performed according to
# the algorithm specified in the PMS.
ver_test() {
	local va op vb

	if [[ $# -eq 3 ]]; then
		va=${1}
		shift
	else
		va=${PVR}
	fi

	[[ $# -eq 2 ]] || die "${FUNCNAME}: bad number of arguments"

	op=${1}
	vb=${2}

	case ${op} in
		-eq|-ne|-lt|-le|-gt|-ge) ;;
		*) die "${FUNCNAME}: invalid operator: ${op}" ;;
	esac

	_ver_compare "${va}" "${vb}"
	test $? "${op}" 2
}