public static bool TryParse(string versionRange, out SemanticVersionRange range, out Exception exception)
{
range = null;
exception = null;
try
{
// empty = latest version.
if (String.IsNullOrEmpty(versionRange))
{
range = new SemanticVersionRange();
return true;
}
// if it starts with a numeric character it should be a single version
// 1.0 = 1.0 <= x
if (Char.IsNumber(versionRange[0]))
{
var version = new SemanticVersion(versionRange);
range = new SemanticVersionRange(new GreaterThanOrEqualsRule(version));
return true;
}
var isRange = versionRange.Contains(",");
var lowerInclusive = versionRange[0] == '[';
var upperInclusive = versionRange[versionRange.Length - 1] == ']';
// (1.0) = invalid
if (!isRange && !lowerInclusive && !upperInclusive)
return false;
// [1.0] = x == 1.0
if (!isRange && lowerInclusive && upperInclusive)
{
var versionString = versionRange.Substring(1, versionRange.Length - 2);
var version = new SemanticVersion(versionString);
range = new SemanticVersionRange(new EqualsRule(version));
return true;
}
var rangeParts = versionRange.Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries);
// check if we have an invalid range, eg. ",1.0" or [1.0,"
// if we get here, we should only have ranges which contains a comma and either
// [ or ( in the beginning and ) or ] in the end.
if (rangeParts.Length != 2)
return false;
// Skip first character to get just the version
var lowerVersion = rangeParts[0].Substring(1);
// Skip last character to get just the version
var upperVersion = rangeParts[1].Substring(0, rangeParts[1].Length - 1);
// Both versions cannot be null or empty
if (String.IsNullOrEmpty(lowerVersion) && String.IsNullOrEmpty(upperVersion))
return false;
if (String.IsNullOrEmpty(lowerVersion))
{
Rule rule;
if (upperInclusive)
{
rule = new LessThanOrEqualsRule(upperVersion);
}
else
{
rule = new LessThanRule(upperVersion);
}
range = new SemanticVersionRange(rule);
return true;
}
if (String.IsNullOrEmpty(upperVersion))
{
Rule rule;
if (lowerInclusive)
{
rule = new GreaterThanOrEqualsRule(lowerVersion);
}
else
{
rule = new GreaterThanRule(lowerVersion);
}
range = new SemanticVersionRange(rule);
return true;
}
Rule upperRule;
Rule lowerRule;
if (upperInclusive)
{
upperRule = new LessThanOrEqualsRule(upperVersion);
}
else
{
upperRule = new LessThanRule(upperVersion);
}
if (lowerInclusive)
{
lowerRule = new GreaterThanOrEqualsRule(lowerVersion);
}
else
{
lowerRule = new GreaterThanRule(lowerVersion);
}
range = new SemanticVersionRange(lowerRule, upperRule);
return true;
}
catch (Exception e)
{
range = null;
exception = e;
return false;
}
}
public bool Equals(SemanticVersion other)
{
if ((object) other == null)
return false;
return this == other;
}
public bool IsIncluded(SemanticVersion version)
{
if (_rules == null)
return false;
return _rules.All(r => r.IsIncluded(version));
}