private static RelationType GetRelationType(string text, out string leftString, out string rightString, out string err)
{
err = null;
leftString = null;
rightString = null;
int[] inds = StringUtils.AllIndicesOf(text, "!=");
if (inds.Length > 1)
{
err = "Multiple != signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 2, out leftString, out rightString);
return(RelationType.NotEqual);
}
inds = StringUtils.AllIndicesOf(text, "==");
if (inds.Length > 1)
{
err = "Multiple == signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 2, out leftString, out rightString);
return(RelationType.Equal);
}
inds = StringUtils.AllIndicesOf(text, ">=");
if (inds.Length > 1)
{
err = "Multiple >= signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 2, out leftString, out rightString);
return(RelationType.GreaterEqual);
}
inds = StringUtils.AllIndicesOf(text, "<=");
if (inds.Length > 1)
{
err = "Multiple <= signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 2, out leftString, out rightString);
return(RelationType.LessEqual);
}
inds = StringUtils.AllIndicesOf(text, "=");
if (inds.Length > 1)
{
err = "Multiple = signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 1, out leftString, out rightString);
return(RelationType.Equal);
}
inds = StringUtils.AllIndicesOf(text, ">");
if (inds.Length > 1)
{
err = "Multiple > signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 1, out leftString, out rightString);
return(RelationType.Greater);
}
inds = StringUtils.AllIndicesOf(text, "<");
if (inds.Length > 1)
{
err = "Multiple < signs.";
return(RelationType.Unknown);
}
if (inds.Length == 1)
{
Extract(text, inds[0], 1, out leftString, out rightString);
return(RelationType.Less);
}
err = "No valid operator.";
return(RelationType.Unknown);
}
