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# frozen_string_literal: true
# IntervalParser parses a simple constraint expressed in the npm syntax
# (or equivalent) and returns a Interval that has an upper boundary
# or a lower boundary.
#
# The constraint is a string that can either be:
# - an operator (>, <, >=, <=, =) followed by a version
# - a version; the interval starts and ends with that version
# - "=*"; the interval has no boundaries and includes any version
#
# Technically IntervalParser returns a Interval such as
# start_cut is BelowAll or end_cut is AboveAll.
# The type of the Interval matches the operator
# that's been detected.
#
module SemverDialects
module IntervalParser
# A constraint is made of an operator followed by a version string.
# Use the regular expression of the SemanticVersion because this is the most generic one.
CONSTRAINT_REGEXP = Regexp.new("(?<op>[><=]+) *(?<version>#{SemanticVersion::VERSION_PATTERN})").freeze
def self.parse(typ, versionstring)
if versionstring == '=*'
# special case = All Versions
return Interval.new(IntervalType::LEFT_OPEN | IntervalType::RIGHT_OPEN, BelowAll.new, AboveAll.new)
end
version_items = versionstring.split(' ')
interval = Interval.new(IntervalType::LEFT_OPEN | IntervalType::RIGHT_OPEN, BelowAll.new, AboveAll.new)
version_items.each do |version_item|
matches = version_item.match CONSTRAINT_REGEXP
raise InvalidConstraintError, versionstring if matches.nil?
version = SemverDialects.parse_version(typ, matches[:version])
boundary = Boundary.new(version)
case matches[:op]
when '>='
new_interval = Interval.new(IntervalType::LEFT_CLOSED | IntervalType::RIGHT_OPEN, boundary, AboveAll.new)
interval = interval.intersect(new_interval)
when '<='
new_interval = Interval.new(IntervalType::LEFT_OPEN | IntervalType::RIGHT_CLOSED, BelowAll.new, boundary)
interval = interval.intersect(new_interval)
when '<'
new_interval = Interval.new(IntervalType::LEFT_OPEN | IntervalType::RIGHT_OPEN, BelowAll.new, boundary)
interval = interval.intersect(new_interval)
when '>'
new_interval = Interval.new(IntervalType::LEFT_OPEN | IntervalType::RIGHT_OPEN, boundary, AboveAll.new)
interval = interval.intersect(new_interval)
when '=', '=='
new_interval = Interval.new(IntervalType::LEFT_CLOSED | IntervalType::RIGHT_CLOSED, boundary, boundary)
interval = interval.intersect(new_interval)
end
end
interval
rescue InvalidVersionError
raise InvalidConstraintError, versionstring
end
end
end
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