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| 1 | +# frozen_string_literal: true |
| 2 | + |
| 3 | +module SplitIoClient |
| 4 | + class Semver |
| 5 | + METADATA_DELIMITER = '+' |
| 6 | + PRE_RELEASE_DELIMITER = '-' |
| 7 | + VALUE_DELIMITER = '.' |
| 8 | + |
| 9 | + attr_reader :major, :minor, :patch, :pre_release, :is_stable, :old_version |
| 10 | + |
| 11 | + def initialize(version) |
| 12 | + @major = 0 |
| 13 | + @minor = 0 |
| 14 | + @patch = 0 |
| 15 | + @pre_release = [] |
| 16 | + @is_stable = false |
| 17 | + @old_version = version |
| 18 | + parse |
| 19 | + end |
| 20 | + |
| 21 | + # |
| 22 | + # Class builder |
| 23 | + # |
| 24 | + # @param version [String] raw version as read from splitChanges response. |
| 25 | + # |
| 26 | + # @return [type] Semver instance |
| 27 | + def self.build(version, logger) |
| 28 | + new(version) |
| 29 | + rescue RuntimeError => e |
| 30 | + logger.warn("Failed to parse Semver data: #{e}") |
| 31 | + nil |
| 32 | + end |
| 33 | + |
| 34 | + # |
| 35 | + # Check if there is any metadata characters in self._old_version. |
| 36 | + # |
| 37 | + # @return [type] String semver without the metadata |
| 38 | + # |
| 39 | + def remove_metadata_if_exists |
| 40 | + index = @old_version.index(METADATA_DELIMITER) |
| 41 | + return @old_version if index.nil? |
| 42 | + |
| 43 | + @old_version[0, index] |
| 44 | + end |
| 45 | + |
| 46 | + # Compare the current Semver object to a given Semver object, return: |
| 47 | + # 0: if self == passed |
| 48 | + # 1: if self > passed |
| 49 | + # -1: if self < passed |
| 50 | + # |
| 51 | + # @param to_compare [trype] splitio.models.grammar.matchers.semver.Semver object |
| 52 | + # |
| 53 | + # @returns [Integer] based on comparison |
| 54 | + def compare(to_compare) |
| 55 | + return 0 if @old_version == to_compare.old_version |
| 56 | + |
| 57 | + # Compare major, minor, and patch versions numerically |
| 58 | + return compare_attributes(to_compare) if compare_attributes(to_compare) != 0 |
| 59 | + |
| 60 | + # Compare pre-release versions lexically |
| 61 | + compare_pre_release(to_compare) |
| 62 | + end |
| 63 | + |
| 64 | + private |
| 65 | + |
| 66 | + def integer?(value) |
| 67 | + value.to_i.to_s == value |
| 68 | + end |
| 69 | + |
| 70 | + # |
| 71 | + # Parse the string in self._old_version to update the other internal variables |
| 72 | + # |
| 73 | + def parse |
| 74 | + without_metadata = remove_metadata_if_exists |
| 75 | + |
| 76 | + index = without_metadata.index(PRE_RELEASE_DELIMITER) |
| 77 | + if index.nil? |
| 78 | + @is_stable = true |
| 79 | + else |
| 80 | + pre_release_data = without_metadata[index + 1..-1] |
| 81 | + without_metadata = without_metadata[0, index] |
| 82 | + @pre_release = pre_release_data.split(VALUE_DELIMITER) |
| 83 | + end |
| 84 | + assign_major_minor_and_patch(without_metadata) |
| 85 | + end |
| 86 | + |
| 87 | + # |
| 88 | + # Set the major, minor and patch internal variables based on string passed. |
| 89 | + # |
| 90 | + # @param version [String] raw version containing major.minor.patch numbers. |
| 91 | + def assign_major_minor_and_patch(version) |
| 92 | + parts = version.split(VALUE_DELIMITER) |
| 93 | + if parts.length != 3 || |
| 94 | + !(integer?(parts[0]) && |
| 95 | + integer?(parts[1]) && |
| 96 | + integer?(parts[2])) |
| 97 | + raise "Unable to convert to Semver, incorrect format: #{version}" |
| 98 | + end |
| 99 | + |
| 100 | + @major = parts[0].to_i |
| 101 | + @minor = parts[1].to_i |
| 102 | + @patch = parts[2].to_i |
| 103 | + end |
| 104 | + |
| 105 | + # |
| 106 | + # Compare 2 variables and return int as follows: |
| 107 | + # 0: if var1 == var2 |
| 108 | + # 1: if var1 > var2 |
| 109 | + # -1: if var1 < var2 |
| 110 | + # |
| 111 | + # @param var1 [type] String/Integer object that accept ==, < or > operators |
| 112 | + # @param var2 [type] String/Integer object that accept ==, < or > operators |
| 113 | + # |
| 114 | + # @returns [Integer] based on comparison |
| 115 | + def compare_vars(var1, var2) |
| 116 | + return 0 if var1 == var2 |
| 117 | + |
| 118 | + return 1 if var1 > var2 |
| 119 | + |
| 120 | + -1 |
| 121 | + end |
| 122 | + |
| 123 | + # Compare the current Semver object's major, minor, patch and is_stable attributes to a given Semver object, return: |
| 124 | + # 0: if self == passed |
| 125 | + # 1: if self > passed |
| 126 | + # -1: if self < passed |
| 127 | + # |
| 128 | + # @param to_compare [trype] splitio.models.grammar.matchers.semver.Semver object |
| 129 | + # |
| 130 | + # @returns [Integer] based on comparison |
| 131 | + def compare_attributes(to_compare) |
| 132 | + result = compare_vars(@major, to_compare.major) |
| 133 | + return result if result != 0 |
| 134 | + |
| 135 | + result = compare_vars(@minor, to_compare.minor) |
| 136 | + return result if result != 0 |
| 137 | + |
| 138 | + result = compare_vars(@patch, to_compare.patch) |
| 139 | + return result if result != 0 |
| 140 | + |
| 141 | + return -1 if !@is_stable && to_compare.is_stable |
| 142 | + |
| 143 | + return 1 if @is_stable && !to_compare.is_stable |
| 144 | + |
| 145 | + 0 |
| 146 | + end |
| 147 | + |
| 148 | + # Compare the current Semver object's pre_release attribute to a given Semver object, return: |
| 149 | + # 0: if self == passed |
| 150 | + # 1: if self > passed |
| 151 | + # -1: if self < passed |
| 152 | + # |
| 153 | + # @param to_compare [trype] splitio.models.grammar.matchers.semver.Semver object |
| 154 | + # |
| 155 | + # @returns [Integer] based on comparison |
| 156 | + def compare_pre_release(to_compare) |
| 157 | + min_length = get_pre_min_length(to_compare) |
| 158 | + 0.upto(min_length - 1) do |i| |
| 159 | + next if @pre_release[i] == to_compare.pre_release[i] |
| 160 | + |
| 161 | + if integer?(@pre_release[i]) && integer?(to_compare.pre_release[i]) |
| 162 | + return compare_vars(@pre_release[i].to_i, to_compare.pre_release[i].to_i) |
| 163 | + end |
| 164 | + |
| 165 | + return compare_vars(@pre_release[i], to_compare.pre_release[i]) |
| 166 | + end |
| 167 | + # Compare lengths of pre-release versions |
| 168 | + compare_vars(@pre_release.length, to_compare.pre_release.length) |
| 169 | + end |
| 170 | + |
| 171 | + # Get minimum of current Semver object's pre_release attributes length to a given Semver object |
| 172 | + # |
| 173 | + # @param to_compare [trype] splitio.models.grammar.matchers.semver.Semver object |
| 174 | + # |
| 175 | + # @returns [Integer] |
| 176 | + def get_pre_min_length(to_compare) |
| 177 | + [@pre_release.length, to_compare.pre_release.length].min |
| 178 | + end |
| 179 | + end |
| 180 | +end |
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