semver.py

# This file comes from https://github.com/podhmo/python-semver/blob/f0392c5567717ad001c058d80fa09887e482ad62/semver/__init__.py
# 
# It is licensed under the following license:
# 
# MIT License

# Copyright (c) 2016 podhmo

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# -*- coding:utf-8 -*-
import logging
logger = logging.getLogger(__name__)
import re

SEMVER_SPEC_VERSION = '2.0.0'

try:
    string_type = basestring # Python 2
except NameError:
    string_type = str # Python 3

class _R(object):
    def __init__(self, i):
        self.i = i

    def __call__(self):
        v = self.i
        self.i += 1
        return v

    def value(self):
        return self.i


class Extendlist(list):
    def __setitem__(self, i, v):
        try:
            list.__setitem__(self, i, v)
        except IndexError:
            if len(self) == i:
                self.append(v)
            else:
                raise


def list_get(xs, i):
    try:
        return xs[i]
    except IndexError:
        return None

R = _R(0)
src = Extendlist()
regexp = {}

# The following Regular Expressions can be used for tokenizing,
# validating, and parsing SemVer version strings.

# ## Numeric Identifier
# A single `0`, or a non-zero digit followed by zero or more digits.

NUMERICIDENTIFIER = R()
src[NUMERICIDENTIFIER] = '0|[1-9]\\d*'

NUMERICIDENTIFIERLOOSE = R()
src[NUMERICIDENTIFIERLOOSE] = '[0-9]+'


# ## Non-numeric Identifier
# Zero or more digits, followed by a letter or hyphen, and then zero or
# more letters, digits, or hyphens.

NONNUMERICIDENTIFIER = R()
src[NONNUMERICIDENTIFIER] = '\\d*[a-zA-Z-][a-zA-Z0-9-]*'

# ## Main Version
# Three dot-separated numeric identifiers.

MAINVERSION = R()
src[MAINVERSION] = ('(' + src[NUMERICIDENTIFIER] + ')\\.' +
                    '(' + src[NUMERICIDENTIFIER] + ')\\.' +
                    '(' + src[NUMERICIDENTIFIER] + ')')

MAINVERSIONLOOSE = R()
src[MAINVERSIONLOOSE] = ('(' + src[NUMERICIDENTIFIERLOOSE] + ')\\.' +
                         '(' + src[NUMERICIDENTIFIERLOOSE] + ')\\.' +
                         '(' + src[NUMERICIDENTIFIERLOOSE] + ')')


# ## Pre-release Version Identifier
# A numeric identifier, or a non-numeric identifier.

PRERELEASEIDENTIFIER = R()
src[PRERELEASEIDENTIFIER] = ('(?:' + src[NUMERICIDENTIFIER] +
                             '|' + src[NONNUMERICIDENTIFIER] + ')')

PRERELEASEIDENTIFIERLOOSE = R()
src[PRERELEASEIDENTIFIERLOOSE] = ('(?:' + src[NUMERICIDENTIFIERLOOSE] +
                                  '|' + src[NONNUMERICIDENTIFIER] + ')')


# ## Pre-release Version
# Hyphen, followed by one or more dot-separated pre-release version
# identifiers.

PRERELEASE = R()
src[PRERELEASE] = ('(?:-(' + src[PRERELEASEIDENTIFIER] +
                   '(?:\\.' + src[PRERELEASEIDENTIFIER] + ')*))')

PRERELEASELOOSE = R()
src[PRERELEASELOOSE] = ('(?:-?(' + src[PRERELEASEIDENTIFIERLOOSE] +
                        '(?:\\.' + src[PRERELEASEIDENTIFIERLOOSE] + ')*))')

# ## Build Metadata Identifier
# Any combination of digits, letters, or hyphens.

BUILDIDENTIFIER = R()
src[BUILDIDENTIFIER] = '[0-9A-Za-z-]+'

# ## Build Metadata
# Plus sign, followed by one or more period-separated build metadata
# identifiers.

BUILD = R()
src[BUILD] = ('(?:\\+(' + src[BUILDIDENTIFIER] +
              '(?:\\.' + src[BUILDIDENTIFIER] + ')*))')

#  ## Full Version String
#  A main version, followed optionally by a pre-release version and
#  build metadata.

#  Note that the only major, minor, patch, and pre-release sections of
#  the version string are capturing groups.  The build metadata is not a
#  capturing group, because it should not ever be used in version
#  comparison.

FULL = R()
FULLPLAIN = ('v?' + src[MAINVERSION] + src[PRERELEASE] + '?' + src[BUILD] + '?')

src[FULL] = '^' + FULLPLAIN + '$'

#  like full, but allows v1.2.3 and =1.2.3, which people do sometimes.
#  also, 1.0.0alpha1 (prerelease without the hyphen) which is pretty
#  common in the npm registry.
LOOSEPLAIN = ('[v=\\s]*' + src[MAINVERSIONLOOSE] +
              src[PRERELEASELOOSE] + '?' +
              src[BUILD] + '?')

LOOSE = R()
src[LOOSE] = '^' + LOOSEPLAIN + '$'

GTLT = R()
src[GTLT] = '((?:<|>)?=?)'

#  Something like "2.*" or "1.2.x".
#  Note that "x.x" is a valid xRange identifer, meaning "any version"
#  Only the first item is strictly required.
XRANGEIDENTIFIERLOOSE = R()
src[XRANGEIDENTIFIERLOOSE] = src[NUMERICIDENTIFIERLOOSE] + '|x|X|\\*'
XRANGEIDENTIFIER = R()
src[XRANGEIDENTIFIER] = src[NUMERICIDENTIFIER] + '|x|X|\\*'

XRANGEPLAIN = R()
src[XRANGEPLAIN] = ('[v=\\s]*(' + src[XRANGEIDENTIFIER] + ')' +
                    '(?:\\.(' + src[XRANGEIDENTIFIER] + ')' +
                    '(?:\\.(' + src[XRANGEIDENTIFIER] + ')' +
                    '(?:(' + src[PRERELEASE] + ')' +
                    ')?)?)?')

XRANGEPLAINLOOSE = R()
src[XRANGEPLAINLOOSE] = ('[v=\\s]*(' + src[XRANGEIDENTIFIERLOOSE] + ')' +
                         '(?:\\.(' + src[XRANGEIDENTIFIERLOOSE] + ')' +
                         '(?:\\.(' + src[XRANGEIDENTIFIERLOOSE] + ')' +
                         '(?:(' + src[PRERELEASELOOSE] + ')' +
                         ')?)?)?')

#  >=2.x, for example, means >=2.0.0-0
#  <1.x would be the same as "<1.0.0-0", though.
XRANGE = R()
src[XRANGE] = '^' + src[GTLT] + '\\s*' + src[XRANGEPLAIN] + '$'
XRANGELOOSE = R()
src[XRANGELOOSE] = '^' + src[GTLT] + '\\s*' + src[XRANGEPLAINLOOSE] + '$'

#  Tilde ranges.
#  Meaning is "reasonably at or greater than"
LONETILDE = R()
src[LONETILDE] = '(?:~>?)'

TILDETRIM = R()
src[TILDETRIM] = '(\\s*)' + src[LONETILDE] + '\\s+'
regexp[TILDETRIM] = re.compile(src[TILDETRIM], re.M)
tildeTrimReplace = r'\1~'

TILDE = R()
src[TILDE] = '^' + src[LONETILDE] + src[XRANGEPLAIN] + '$'
TILDELOOSE = R()
src[TILDELOOSE] = ('^' + src[LONETILDE] + src[XRANGEPLAINLOOSE] + '$')

#  Caret ranges.
#  Meaning is "at least and backwards compatible with"
LONECARET = R()
src[LONECARET] = '(?:\\^)'

CARETTRIM = R()
src[CARETTRIM] = '(\\s*)' + src[LONECARET] + '\\s+'
regexp[CARETTRIM] = re.compile(src[CARETTRIM], re.M)
caretTrimReplace = r'\1^'

CARET = R()
src[CARET] = '^' + src[LONECARET] + src[XRANGEPLAIN] + '$'
CARETLOOSE = R()
src[CARETLOOSE] = '^' + src[LONECARET] + src[XRANGEPLAINLOOSE] + '$'

#  A simple gt/lt/eq thing, or just "" to indicate "any version"
COMPARATORLOOSE = R()
src[COMPARATORLOOSE] = '^' + src[GTLT] + '\\s*(' + LOOSEPLAIN + ')$|^$'
COMPARATOR = R()
src[COMPARATOR] = '^' + src[GTLT] + '\\s*(' + FULLPLAIN + ')$|^$'


#  An expression to strip any whitespace between the gtlt and the thing
#  it modifies, so that `> 1.2.3` ==> `>1.2.3`
COMPARATORTRIM = R()
src[COMPARATORTRIM] = ('(\\s*)' + src[GTLT] +
                       '\\s*(' + LOOSEPLAIN + '|' + src[XRANGEPLAIN] + ')')

#  this one has to use the /g flag
regexp[COMPARATORTRIM] = re.compile(src[COMPARATORTRIM], re.M)
comparatorTrimReplace = r'\1\2\3'


#  Something like `1.2.3 - 1.2.4`
#  Note that these all use the loose form, because they'll be
#  checked against either the strict or loose comparator form
#  later.
HYPHENRANGE = R()
src[HYPHENRANGE] = ('^\\s*(' + src[XRANGEPLAIN] + ')' +
                    '\\s+-\\s+' +
                    '(' + src[XRANGEPLAIN] + ')' +
                    '\\s*$')

HYPHENRANGELOOSE = R()
src[HYPHENRANGELOOSE] = ('^\\s*(' + src[XRANGEPLAINLOOSE] + ')' +
                         '\\s+-\\s+' +
                         '(' + src[XRANGEPLAINLOOSE] + ')' +
                         '\\s*$')

#  Star ranges basically just allow anything at all.
STAR = R()
src[STAR] = '(<|>)?=?\\s*\\*'

# version name recovery for convinient
RECOVERYVERSIONNAME = R()
src[RECOVERYVERSIONNAME] = ('v?({n})(?:\\.({n}))?{pre}?'.format(n=src[NUMERICIDENTIFIER], pre=src[PRERELEASELOOSE]))

#  Compile to actual regexp objects.
#  All are flag-free, unless they were created above with a flag.
for i in range(R.value()):
    logger.debug("genregxp %s %s", i, src[i])
    if i not in regexp:
        regexp[i] = re.compile(src[i])


def parse(version, loose):
    if loose:
        r = regexp[LOOSE]
    else:
        r = regexp[FULL]
    m = r.search(version)
    if m:
        return semver(version, loose)
    else:
        return None


def valid(version, loose):
    v = parse(version, loose)
    if v.version:
        return v
    else:
        return None


def clean(version, loose):
    s = parse(version, loose)
    if s:
        return s.version
    else:
        return None

NUMERIC = re.compile("^\d+$")


def semver(version, loose):
    if isinstance(version, SemVer):
        if version.loose == loose:
            return version
        else:
            version = version.version
    elif not isinstance(version, string_type):  # xxx:
        raise ValueError("Invalid Version: {}".format(version))

    """
    if (!(this instanceof SemVer))
       return new SemVer(version, loose);
    """
    return SemVer(version, loose)
make_semver = semver


class SemVer(object):
    def __init__(self, version, loose):
        logger.debug("SemVer %s, %s", version, loose)
        self.loose = loose
        self.raw = version

        m = regexp[LOOSE if loose else FULL].search(version.strip())
        if not m:
            if not loose:
                raise ValueError("Invalid Version: {}".format(version))
            m = regexp[RECOVERYVERSIONNAME].search(version.strip())
            self.major = int(m.group(1)) if m.group(1) else 0
            self.minor = int(m.group(2)) if m.group(2) else 0
            self.patch = 0
            if not m.group(3):
                self.prerelease = []
            else:
                self.prerelease = [(int(id) if NUMERIC.search(id) else id)
                                   for id in m.group(3).split(".")]
        else:
            #  these are actually numbers
            self.major = int(m.group(1))
            self.minor = int(m.group(2))
            self.patch = int(m.group(3))
            #  numberify any prerelease numeric ids
            if not m.group(4):
                self.prerelease = []
            else:

                self.prerelease = [(int(id) if NUMERIC.search(id) else id)
                                   for id in m.group(4).split(".")]
            if m.group(5):
                self.build = m.group(5).split(".")
            else:
                self.build = []

        self.format()  # xxx:

    def format(self):
        self.version = "{}.{}.{}".format(self.major, self.minor, self.patch)
        if len(self.prerelease) > 0:
            self.version += ("-{}".format(".".join(str(v) for v in self.prerelease)))
        return self.version

    def __repr__(self):
        return "<SemVer {!r} >".format(self)

    def __str__(self):
        return self.version

    def compare(self, other):
        logger.debug('SemVer.compare %s %s %s', self.version, self.loose, other)
        if not isinstance(other, SemVer):
            other = make_semver(other, self.loose)
        result = self.compare_main(other) or self.compare_pre(other)
        logger.debug("compare result %s", result)
        return result

    def compare_main(self, other):
        if not isinstance(other, SemVer):
            other = make_semver(other, self.loose)

        return (compare_identifiers(str(self.major), str(other.major)) or
                compare_identifiers(str(self.minor), str(other.minor)) or
                compare_identifiers(str(self.patch), str(other.patch)))

    def compare_pre(self, other):
        if not isinstance(other, SemVer):
            other = make_semver(other, self.loose)

        #  NOT having a prerelease is > having one
        is_self_more_than_zero = len(self.prerelease) > 0
        is_other_more_than_zero = len(other.prerelease) > 0

        if not is_self_more_than_zero and is_other_more_than_zero:
            return 1
        elif is_self_more_than_zero and not is_other_more_than_zero:
            return -1
        elif not is_self_more_than_zero and not is_other_more_than_zero:
            return 0

        i = 0
        while True:
            a = list_get(self.prerelease, i)
            b = list_get(other.prerelease, i)
            logger.debug("prerelease compare %s: %s %s", i, a, b)
            i += 1
            if a is None and b is None:
                return 0
            elif b is None:
                return 1
            elif a is None:
                return -1
            elif a == b:
                continue
            else:
                return compare_identifiers(str(a), str(b))

    def inc(self, release):
        self._inc(release)
        i = -1
        while len(self.prerelease) > 1 and self.prerelease[i] == 0:
            self.prerelease.pop()
        self.format()
        return self

    def _inc(self, release):
        logger.debug("inc release %s %s", self.prerelease, release)
        if release == 'premajor':
            self._inc("major")
            self._inc("pre")
        elif release == "preminor":
            self._inc("minor")
            self._inc("pre")
        elif release == "prepatch":
            self._inc("patch")
            self._inc("pre")
        elif release == 'prerelease':
            if len(self.prerelease) == 0:
                self._inc("patch")
            self._inc("pre")
        elif release == "major":
            self.major += 1
            self.minor = -1
            self.minor += 1
            self.patch = 0
            self.prerelease = []
        elif release == "minor":
            self.minor += 1
            self.patch = 0
            self.prerelease = []
        elif release == "patch":
            #  If this is not a pre-release version, it will increment the patch.
            #  If it is a pre-release it will bump up to the same patch version.
            #  1.2.0-5 patches to 1.2.0
            #  1.2.0 patches to 1.2.1
            if len(self.prerelease) == 0:
                self.patch += 1
            self.prerelease = []
        elif release == "pre":
            #  This probably shouldn't be used publically.
            #  1.0.0 "pre" would become 1.0.0-0 which is the wrong direction.
            logger.debug("inc prerelease %s", self.prerelease)
            if len(self.prerelease) == 0:
                self.prerelease = [0]
            else:
                i = len(self.prerelease) - 1
                while i >= 0:
                    if isinstance(self.prerelease[i], int):
                        self.prerelease[i] += 1
                        i -= 2
                    i -= 1
                if i == -1:  # didn't increment anything
                    self.prerelease.append(0)
        else:
            raise ValueError('invalid increment argument: {}'.format(release))
        return self


def inc(version, release, loose):  # wow!
    try:
        return make_semver(version, loose).inc(release).version
    except Exception as e:
        logger.debug(e, exc_info=5)
        return None


def compare_identifiers(a, b):
    anum = NUMERIC.search(a)
    bnum = NUMERIC.search(b)

    if anum and bnum:
        a = int(a)
        b = int(b)

    if anum and not bnum:
        return -1
    elif bnum and not anum:
        return 1
    elif a < b:
        return -1
    elif a > b:
        return 1
    else:
        return 0


def rcompare_identifiers(a, b):
    return compare_identifiers(b, a)


def compare(a, b, loose):
    return make_semver(a, loose).compare(b)


def compare_loose(a, b):
    return compare(a, b, True)


def rcompare(a, b, loose):
    return compare(b, a, loose)


def sort(list, loose):
    list.sort(lambda a, b: compare(a, b, loose))
    return list


def rsort(list, loose):
    list.sort(lambda a, b: rcompare(a, b, loose))
    return list


def gt(a, b, loose):
    return compare(a, b, loose) > 0


def lt(a, b, loose):
    return compare(a, b, loose) < 0


def eq(a, b, loose):
    return compare(a, b, loose) == 0


def neq(a, b, loose):
    return compare(a, b, loose) != 0


def gte(a, b, loose):
    return compare(a, b, loose) >= 0


def lte(a, b, loose):
    return compare(a, b, loose) <= 0


def cmp(a, op, b, loose):
    logger.debug("cmp: %s", op)
    if op == "===":
        return a == b
    elif op == "!==":
        return a != b
    elif op == "" or op == "=" or op == "==":
        return eq(a, b, loose)
    elif op == "!=":
        return neq(a, b, loose)
    elif op == ">":
        return gt(a, b, loose)
    elif op == ">=":
        return gte(a, b, loose)
    elif op == "<":
        return lt(a, b, loose)
    elif op == "<=":
        return lte(a, b, loose)
    else:
        raise ValueError("Invalid operator: {}".format(op))


def comparator(comp, loose):
    if isinstance(comp, Comparator):
        if(comp.loose == loose):
            return comp
        else:
            comp = comp.value

    # if (!(this instanceof Comparator))
    #   return new Comparator(comp, loose)
    return Comparator(comp, loose)
make_comparator = comparator

ANY = object()


class Comparator(object):
    semver = None

    def __init__(self, comp, loose):
        logger.debug("comparator: %s %s", comp, loose)
        self.loose = loose
        self.parse(comp)

        if self.semver == ANY:
            self.value = ""
        else:
            self.value = self.operator + self.semver.version

    def parse(self, comp):
        if self.loose:
            r = regexp[COMPARATORLOOSE]
        else:
            r = regexp[COMPARATOR]
        logger.debug("parse comp=%s", comp)
        m = r.search(comp)

        if m is None:
            raise ValueError("Invalid comparator: {}".format(comp))

        self.operator = m.group(1)
        # if it literally is just '>' or '' then allow anything.
        if m.group(2) is None:
            self.semver = ANY
        else:
            self.semver = semver(m.group(2), self.loose)
            #  <1.2.3-rc DOES allow 1.2.3-beta (has prerelease)
            #  >=1.2.3 DOES NOT allow 1.2.3-beta
            #  <=1.2.3 DOES allow 1.2.3-beta
            #  However, <1.2.3 does NOT allow 1.2.3-beta,
            #  even though `1.2.3-beta < 1.2.3`
            #  The assumption is that the 1.2.3 version has something you
            #  *don't* want, so we push the prerelease down to the minimum.
            if (self.operator == '<' and len(self.semver.prerelease) >= 0):
                self.semver.prerelease = ["0"]
                self.semver.format()
                logger.debug("Comparator.parse semver %s", self.semver)

    def __repr__(self):
        return '<SemVer Comparator "{}">'.format(self)

    def __str__(self):
        return self.value

    def test(self, version):
        logger.debug('Comparator, test %s, %s', version, self.loose)
        if self.semver == ANY:
            return True
        else:
            return cmp(version, self.operator, self.semver, self.loose)


def make_range(range_, loose):
    if isinstance(range_, Range) and range_.loose == loose:
        return range_

    # if (!(this instanceof Range))
    #    return new Range(range, loose);
    return Range(range_, loose)


class Range(object):
    def __init__(self, range_, loose):
        self.loose = loose
        #  First, split based on boolean or ||
        self.raw = range_
        xs = [self.parse_range(r.strip()) for r in re.split(r"\s*\|\|\s*", range_)]
        self.set = [r for r in xs if len(r) >= 0]

        if not len(self.set):
            raise ValueError("Invalid SemVer Range: {}".format(range_))

        self.format()

    def __repr__(self):
        return '<SemVer Range "{}">'.format(self.range)

    def format(self):
        self.range = "||".join([" ".join(c.value for c in comps).strip() for comps in self.set]).strip()
        logger.debug("Range format %s", self.range)
        return self.range

    def __str__(self):
        return self.range

    def parse_range(self, range_):
        loose = self.loose
        logger.debug('range %s %s', range_, loose)
        #  `1.2.3 - 1.2.4` => `>=1.2.3 <=1.2.4`
        if loose:
            hr = regexp[HYPHENRANGELOOSE]
        else:
            hr = regexp[HYPHENRANGE]

        range_ = hr.sub(hyphen_replace, range_,)
        logger.debug('hyphen replace %s', range_)

        #  `> 1.2.3 < 1.2.5` => `>1.2.3 <1.2.5`
        range_ = regexp[COMPARATORTRIM].sub(comparatorTrimReplace, range_)
        logger.debug('comparator trim %s, %s', range_, regexp[COMPARATORTRIM])

        #  `~ 1.2.3` => `~1.2.3`
        range_ = regexp[TILDETRIM].sub(tildeTrimReplace, range_)

        #  `^ 1.2.3` => `^1.2.3`
        range_ = regexp[CARETTRIM].sub(caretTrimReplace, range_)

        #  normalize spaces
        range_ = " ".join(re.split("\s+", range_))

        #  At this point, the range is completely trimmed and
        #  ready to be split into comparators.
        if loose:
            comp_re = regexp[COMPARATORLOOSE]
        else:
            comp_re = regexp[COMPARATOR]
        set_ = re.split("\s+", ' '.join([parse_comparator(comp, loose) for comp in range_.split(" ")]))
        if self.loose:
            # in loose mode, throw out any that are not valid comparators
            set_ = [comp for comp in set_ if comp_re.search(comp)]
        set_ = [make_comparator(comp, loose) for comp in set_]
        return set_

    def test(self, version):
        if version is None:  # xxx
            return False
        for e in self.set:
            if test_set(e, version):
                return True
        return False


#  Mostly just for testing and legacy API reasons
def to_comparators(range_, loose):
    return [" ".join([c.value for c in comp]).strip().split(" ")
            for comp in make_range(range_, loose).set]


#  comprised of xranges, tildes, stars, and gtlt's at this point.
#  already replaced the hyphen ranges
#  turn into a set of JUST comparators.

def parse_comparator(comp, loose):
    logger.debug('comp %s', comp)
    comp = replace_carets(comp, loose)
    logger.debug('caret %s', comp)
    comp = replace_tildes(comp, loose)
    logger.debug('tildes %s', comp)
    comp = replace_xranges(comp, loose)
    logger.debug('xrange %s', comp)
    comp = replace_stars(comp, loose)
    logger.debug('stars %s', comp)
    return comp


def is_x(id):
    return id is None or id == "" or id.lower() == "x" or id == "*"


#  ~, ~> --> * (any, kinda silly)
#  ~2, ~2.x, ~2.x.x, ~>2, ~>2.x ~>2.x.x --> >=2.0.0 <3.0.0
#  ~2.0, ~2.0.x, ~>2.0, ~>2.0.x --> >=2.0.0 <2.1.0
#  ~1.2, ~1.2.x, ~>1.2, ~>1.2.x --> >=1.2.0 <1.3.0
#  ~1.2.3, ~>1.2.3 --> >=1.2.3 <1.3.0
#  ~1.2.0, ~>1.2.0 --> >=1.2.0 <1.3.0

def replace_tildes(comp, loose):
    return " ".join([replace_tilde(c, loose)
                     for c in re.split("\s+", comp.strip())])


def replace_tilde(comp, loose):
    if loose:
        r = regexp[TILDELOOSE]
    else:
        r = regexp[TILDE]

    def repl(mob):
        _ = mob.group(0)
        M, m, p, pr, _ = mob.groups()
        logger.debug("tilde %s %s %s %s %s %s", comp, _, M, m, p, pr)
        if is_x(M):
            ret = ""
        elif is_x(m):
            ret = '>=' + M + '.0.0-0 <' + str(int(M) + 1) + '.0.0-0'
        elif is_x(p):
            # ~1.2 == >=1.2.0- <1.3.0-
            ret = '>=' + M + '.' + m + '.0-0 <' + M + '.' + str(int(m) + 1) + '.0-0'
        elif pr:
            logger.debug("replaceTilde pr %s", pr)
            if (pr[0] != "-"):
                pr = '-' + pr
            ret = '>=' + M + '.' + m + '.' + p + pr +' <' + M + '.' + str(int(m) + 1) + '.0-0'
        else:
            #  ~1.2.3 == >=1.2.3-0 <1.3.0-0
            ret = '>=' + M + '.' + m + '.' + p + '-0' +' <' + M + '.' + str(int(m) + 1) + '.0-0'
        logger.debug('tilde return, %s', ret)
        return ret
    return r.sub(repl, comp)


#  ^ --> * (any, kinda silly)
#  ^2, ^2.x, ^2.x.x --> >=2.0.0 <3.0.0
#  ^2.0, ^2.0.x --> >=2.0.0 <3.0.0
#  ^1.2, ^1.2.x --> >=1.2.0 <2.0.0
#  ^1.2.3 --> >=1.2.3 <2.0.0
#  ^1.2.0 --> >=1.2.0 <2.0.0
def replace_carets(comp, loose):
    return " ".join([replace_caret(c, loose)
                     for c in re.split("\s+", comp.strip())])


def replace_caret(comp, loose):
    if loose:
        r = regexp[CARETLOOSE]
    else:
        r = regexp[CARET]

    def repl(mob):
        m0 = mob.group(0)
        M, m, p, pr, _ = mob.groups()
        logger.debug("caret %s %s %s %s %s %s", comp, m0, M, m, p, pr)

        if is_x(M):
            ret = ""
        elif is_x(m):
            ret = '>=' + M + '.0.0-0 <' + str((int(M) + 1)) + '.0.0-0'
        elif is_x(p):
            if M == "0":
                ret = '>=' + M + '.' + m + '.0-0 <' + M + '.' + str((int(m) + 1)) + '.0-0'
            else:
                ret = '>=' + M + '.' + m + '.0-0 <' + str(int(M) + 1) + '.0.0-0'
        elif pr:
            logger.debug('replaceCaret pr %s', pr)
            if pr[0] != "-":
                pr = "-" + pr
            if M == "0":
                if m == "0":
                    ret = '=' + M + '.' + m + '.' + (p or "") + pr
                else:
                    ret = '>=' + M + '.' + m + '.' + (p or "") + pr +' <' + M + '.' + str(int(m) + 1) + '.0-0'
            else:
                ret = '>=' + M + '.' + m + '.' + (p or "") + pr + ' <' + str(int(M) + 1) + '.0.0-0'
        else:
            if M == "0":
                if m == "0":
                    ret = '=' + M + '.' + m + '.' + (p or "")
                else:
                    ret = '>=' + M + '.' + m + '.' + (p or "") + '-0' + ' <' + M + '.' + str((int(m) + 1)) + '.0-0'
            else:
                ret = '>=' + M + '.' + m + '.' + (p or "") + '-0' +' <' + str(int(M) + 1) + '.0.0-0'
        logger.debug('caret return %s', ret)
        return ret

    return r.sub(repl, comp)


def replace_xranges(comp, loose):
    logger.debug('replaceXRanges %s %s', comp, loose)
    return " ".join([replace_xrange(c, loose)
                     for c in re.split("\s+", comp.strip())])


def replace_xrange(comp, loose):
    comp = comp.strip()
    if loose:
        r = regexp[XRANGELOOSE]
    else:
        r = regexp[XRANGE]

    def repl(mob):
        ret = mob.group(0)
        gtlt, M, m, p, pr, _ = mob.groups()

        logger.debug("xrange %s %s %s %s %s %s %s", comp, ret, gtlt, M, m, p, pr)

        xM = is_x(M)
        xm = xM or is_x(m)
        xp = xm or is_x(p)
        any_x = xp

        if gtlt == "=" and any_x:
            gtlt = ""

        logger.debug("xrange gtlt=%s any_x=%s", gtlt, any_x)
        if gtlt and any_x:
            # replace X with 0, and then append the -0 min-prerelease
            if xM:
                M = 0
            if xm:
                m = 0
            if xp:
                p = 0

            if gtlt == ">":
                #  >1 => >=2.0.0-0
                #  >1.2 => >=1.3.0-0
                #  >1.2.3 => >= 1.2.4-0
                gtlt = ">="
                if xM:
                    #  not change
                    pass
                elif xm:
                    M = int(M) + 1
                    m = 0
                    p = 0
                elif xp:
                    m = int(m) + 1
                    p = 0
            ret = gtlt + str(M) + '.' + str(m) + '.' + str(p) + '-0'
        elif xM:
            #  allow any
            ret = "*"
        elif xm:
            #  append '-0' onto the version, otherwise
            #  '1.x.x' matches '2.0.0-beta', since the tag
            #  *lowers* the version value
            ret = '>=' + M + '.0.0-0 <' + str(int(M) + 1) + '.0.0-0'
        elif xp:
            ret = '>=' + M + '.' + m + '.0-0 <' + M + '.' + str(int(m) + 1) + '.0-0'
        logger.debug('xRange return %s', ret)

        return ret
    return r.sub(repl, comp)


#  Because * is AND-ed with everything else in the comparator,
#  and '' means "any version", just remove the *s entirely.
def replace_stars(comp, loose):
    logger.debug('replaceStars %s %s', comp, loose)
    #  Looseness is ignored here.  star is always as loose as it gets!
    return regexp[STAR].sub("", comp.strip())


#  This function is passed to string.replace(re[HYPHENRANGE])
#  M, m, patch, prerelease, build
#  1.2 - 3.4.5 => >=1.2.0-0 <=3.4.5
#  1.2.3 - 3.4 => >=1.2.0-0 <3.5.0-0 Any 3.4.x will do
#  1.2 - 3.4 => >=1.2.0-0 <3.5.0-0
def hyphen_replace(mob):
    from_, fM, fm, fp, fpr, fb, to, tM, tm, tp, tpr, tb = mob.groups()
    if is_x(fM):
        from_ = ""
    elif is_x(fm):
        from_ = '>=' + fM + '.0.0-0'
    elif is_x(fp):
        from_ = '>=' + fM + '.' + fm + '.0-0'
    else:
        from_ = ">=" + from_

    if is_x(tM):
        to = ""
    elif is_x(tm):
        to = '<' + str(int(tM) + 1) + '.0.0-0'
    elif is_x(tp):
        to = '<' + tM + '.' + str(int(tm) + 1) + '.0-0'
    elif tpr:
        to = '<=' + tM + '.' + tm + '.' + tp + '-' + tpr
    else:
        to = '<=' + to
    return (from_ + ' ' + to).strip()


def test_set(set_, version):
    for e in set_:
        if not e.test(version):
            return False
    return True


def satisfies(version, range_, loose):
    try:
        range_ = make_range(range_, loose)
    except Exception as e:
        return False
    return range_.test(version)


def max_satisfying(versions, range_, loose):
    xs = [version for version in versions if satisfies(version, range_, loose)]
    if len(xs) <= 0:
        return None
    selected = xs[0]
    for x in xs[1:]:
        try:
            if rcompare(selected, x, loose) == 1:
                selected = x
        except ValueError:
            logger.warn("{} is invalud version".format(x))
    return selected


def valid_range(range_, loose):
    try:
        #  Return '*' instead of '' so that truthiness works.
        #  This will throw if it's invalid anyway
        return make_range(range_, loose).range or "*"
    except:
        return None


#  Determine if version is less than all the versions possible in the range
def ltr(version, range_, loose):
    return outside(version, range_, "<", loose)


#  Determine if version is greater than all the versions possible in the range.
def rtr(version, range_, loose):
    return outside(version, range_, ">", loose)


def outside(version, range_, hilo, loose):
    version = make_semver(version, loose)
    range_ = make_range(range_, loose)

    if hilo == ">":
        gtfn = gt
        ltefn = lte
        ltfn = lt
        comp = ">"
        ecomp = ">="
    elif hilo == "<":
        gtfn = lt
        ltefn = gte
        ltfn = gt
        comp = "<"
        ecomp = "<="
    else:
        raise ValueError("Must provide a hilo val of '<' or '>'")

    #  If it satisifes the range it is not outside
    if satisfies(version, range_, loose):
        return False

    #  From now on, variable terms are as if we're in "gtr" mode.
    #  but note that everything is flipped for the "ltr" function.
    for comparators in range_.set:
        high = None
        low = None

        for comparator in comparators:
            high = high or comparator
            low = low or comparator

            if gtfn(comparator.semver, high.semver, loose):
                high = comparator
            elif ltfn(comparator.semver, low.semver, loose):
                low = comparator

    #  If the edge version comparator has a operator then our version
    #  isn't outside it
    if high.operator == comp or high.operator == ecomp:
        return False

    #  If the lowest version comparator has an operator and our version
    #  is less than it then it isn't higher than the range
    if (not low.operator or low.operator == comp) and ltefn(version, low.semver):
        return False
    elif low.operator == ecomp and ltfn(version, low.semver):
        return False
    return True