public override IExpression CorrectTerm(TermExpression te)
{
if (te == null)
{
throw new ArgumentNullException("te");
}
if (!te.ColumnName.Equals("*"))
{
string value = te.Value.ToString();
if (value.Equals("today", StringComparison.OrdinalIgnoreCase))
{
return(new TermExpression(te.ColumnName, te.Operator, DateTime.Today.ToUniversalTime()));
}
else if (value.StartsWith("today-", StringComparison.OrdinalIgnoreCase))
{
int relativeDays = 0;
if (int.TryParse(value.Substring(6), out relativeDays))
{
return(new TermExpression(te.ColumnName, te.Operator, DateTime.Today.AddDays(-relativeDays).ToUniversalTime()));
}
}
}
return(null);
}
public StringEvaluator(Func <T, string> getter, TermExpression term, StringComparison stringComparison)
{
_getter = getter;
_value = term.Value;
_evaluateSet = Comparer(term);
_stringComparison = stringComparison;
}
private static void GetAllTerms(IExpression expression, string columnName, List <TermExpression> result)
{
if (expression is AllExceptColumnsTermExpression)
{
AllExceptColumnsTermExpression te = (AllExceptColumnsTermExpression)expression;
if (!te.RestrictedColumns.Contains(columnName))
{
result.Add(te);
}
}
else if (expression is TermExpression)
{
TermExpression te = (TermExpression)expression;
if (String.IsNullOrEmpty(columnName) || te.ColumnName.Equals("*") || String.Equals(columnName, te.ColumnName, StringComparison.OrdinalIgnoreCase))
{
result.Add(te);
}
}
foreach (IExpression child in expression.Children())
{
GetAllTerms(child, columnName, result);
}
}
public DataBlockResult Compute(Partition p)
{
if (p == null)
{
throw new ArgumentNullException("p");
}
DataBlockResult result = new DataBlockResult(this);
// Find matches for the remaining query
ShortSet baseQueryMatches = new ShortSet(p.Count);
this.Where.TryEvaluate(p, baseQueryMatches, result.Details);
// Find and count matches per column for the term in the outer query
List <Tuple <string, int> > matchCountPerColumn = new List <Tuple <string, int> >();
if (baseQueryMatches.Count() > 0)
{
TermExpression bareTerm = new TermExpression(this.Term);
ShortSet termMatchesForColumn = new ShortSet(p.Count);
bool succeeded = false;
ExecutionDetails perColumnDetails = new ExecutionDetails();
foreach (IColumn <object> column in p.Columns.Values)
{
termMatchesForColumn.Clear();
perColumnDetails.Succeeded = true;
column.TryWhere(Operator.Matches, this.Term, termMatchesForColumn, perColumnDetails);
succeeded |= perColumnDetails.Succeeded;
termMatchesForColumn.And(baseQueryMatches);
ushort matchCount = termMatchesForColumn.Count();
if (matchCount > 0)
{
matchCountPerColumn.Add(new Tuple <string, int>(column.Name, (int)matchCount));
}
}
// Sort results by count of matches descending
matchCountPerColumn.Sort((left, right) => right.Item2.CompareTo(left.Item2));
}
// Copy to a DataBlock and return it
int index = 0;
DataBlock block = new DataBlock(new string[] { "ColumnName", "Count" }, matchCountPerColumn.Count);
foreach (var column in matchCountPerColumn)
{
block[index, 0] = column.Item1;
block[index, 1] = column.Item2;
index++;
}
result.Values = block;
result.Total = baseQueryMatches.Count();
return(result);
}
private static void AddTopColumnValues(IntelliSenseResult result, TermExpression lastTerm, IntelliSenseGuidance guidance, List <IntelliSenseItem> suggestions, Table singleTable, ColumnDetails singleColumn)
{
string completeQuery = GetCompleteQueryPrefix(result);
// Recommend the top ten values in the column with the prefix typed so far
DistinctResult topValues = singleTable.Query(new DistinctQueryTop(singleColumn.Name, lastTerm.Value.ToString(), completeQuery, 10));
int total = (int)topValues.Total;
if (topValues.Total == 0)
{
return;
}
// Walk values in order for ==, :, ::, backwards with inverse percentages for !=
bool isNotEquals = lastTerm.Operator == Operator.NotEquals;
int start = isNotEquals ? topValues.Values.RowCount - 1 : 0;
int end = isNotEquals ? -1 : topValues.Values.RowCount;
int step = isNotEquals ? -1 : 1;
for (int i = start; i != end; i += step)
{
string value = topValues.Values[i, 0].ToString();
int countForValue = (int)topValues.Values[i, 1];
if (isNotEquals)
{
countForValue = (int)topValues.Total - countForValue;
}
if ((countForValue > 1 || total <= 10) && value.StartsWith(guidance.Value, StringComparison.OrdinalIgnoreCase) && value.Length < 100)
{
suggestions.Add(new IntelliSenseItem(QueryTokenCategory.Value, QueryParser.WrapValue(topValues.Values[i, 0]), countForValue, topValues.Total));
}
}
}
public override IExpression CorrectTerm(TermExpression te)
{
// If we couldn't get the People table, don't do anything
if (this.People == null)
{
return(null);
}
// For a specific column, a string value, and an operator safe to correct with 'original OR correction', consider alias correction
if (!te.ColumnName.Equals("*") && te.Value.BestType().Equals(typeof(string)) && te.Operator.IsOrCorrectableOperator())
{
// Query for aliases equal to this value
string value = te.Value.ToString();
SelectQuery q = new SelectQuery();
q.Columns = new string[] { "Display Name" };
q.Where = new TermExpression("Alias", Operator.Equals, value);
q.Count = 1;
SelectResult r = this.People.Query(q);
// If one is found, return the original value or the alias
if (r.Total > 0)
{
return(new OrExpression(te, new TermExpression(te.ColumnName, te.Operator, r.Values[0, 0])));
}
}
return(null);
}
private Action <ICollection <T>, BitArray> Comparer(TermExpression term)
{
switch (term.Operator)
{
case CompareOperator.Equals:
return(EvaluateEquals);
case CompareOperator.NotEquals:
return(EvaluateNotEquals);
case CompareOperator.LessThan:
return(EvaluateLessThan);
case CompareOperator.LessThanOrEquals:
return(EvaluateLessThanOrEquals);
case CompareOperator.GreaterThan:
return(EvaluateGreaterThan);
case CompareOperator.GreaterThanOrEquals:
return(EvaluateGreaterThanOrEquals);
default:
throw new QueryParseException($"{term} does not support operator {term.Operator}");
}
}
public static IExpressionEvaluator <Result> ResultEvaluator(TermExpression term)
{
string propertyNameLower = term.PropertyName.ToLowerInvariant();
switch (propertyNameLower)
{
case "baselinestate":
return(new EnumEvaluator <Result, BaselineState>(r => r.BaselineState, term));
case "correlationguid":
return(new StringEvaluator <Result>(r => r.CorrelationGuid, term, StringComparison.OrdinalIgnoreCase));
case "guid":
return(new StringEvaluator <Result>(r => r.Guid, term, StringComparison.OrdinalIgnoreCase));
case "hostedvieweruri":
return(new StringEvaluator <Result>(r => r.HostedViewerUri?.ToString(), term, StringComparison.OrdinalIgnoreCase));
case "kind":
return(new EnumEvaluator <Result, ResultKind>(r => r.Kind, term));
case "level":
return(new EnumEvaluator <Result, FailureLevel>(r => r.Level, term));
case "message.text":
return(new StringEvaluator <Result>(r => r.Message?.Text, term, StringComparison.OrdinalIgnoreCase));
case "occurrencecount":
return(new LongEvaluator <Result>(r => r.OccurrenceCount, term));
case "rank":
return(new DoubleEvaluator <Result>(r => r.Rank, term));
case "ruleid":
return(new StringEvaluator <Result>(r => r.GetRule(r.Run).Id, term, StringComparison.OrdinalIgnoreCase));
case "uri":
// Ensure the Run is provided, to look up Uri from Run.Artifacts when needed.
// Uri : "/Core/" will match all Results with any Uri which contains "/Core/"
return(new SetEvaluator <Result, string>(r =>
{
r.EnsureRunProvided();
return r.Locations?.Select(l => l?.PhysicalLocation?.ArtifactLocation.Resolve(r.Run)?.Uri?.ToString() ?? "");
}, term));
default:
if (propertyNameLower.StartsWith(PropertyBagPropertyEvaluator.ResultPropertyPrefix) ||
propertyNameLower.StartsWith(PropertyBagPropertyEvaluator.RulePropertyPrefix))
{
return(new PropertyBagPropertyEvaluator(term));
}
throw new QueryParseException(
string.Format(
CultureInfo.CurrentCulture,
SdkResources.ErrorInvalidQueryPropertyName,
term.PropertyName));
}
}
/// <summary>
/// Build a SetEvaluator given a method to get an IEnumerable<U> of a primitive type
/// and the term showing the operator and value to compare against.
/// </summary>
/// <param name="getter">Getter to return a set of U given a T</param>
/// <param name="term">TermExpression for how to match each T</param>
public SetEvaluator(Func <T, IEnumerable <U> > getter, TermExpression term)
{
_getter = getter;
object innerEvaluator = EvaluatorFactory.BuildPrimitiveEvaluator(typeof(U), term);
_innerEvaluator = (IExpressionEvaluator <U>)innerEvaluator;
}
public void PropertyBagPropertyEvaluator_RejectsPropertyNameWithInvalidPrefix()
{
var expression = new TermExpression(propertyName: "invalid.prefix", op: CompareOperator.Equals, value: string.Empty);
Action action = () => new PropertyBagPropertyEvaluator(expression);
action.Should().Throw <ArgumentException>();
}
private static void AddValueDistribution(IntelliSenseResult result, TermExpression lastTerm, IntelliSenseGuidance guidance, List <IntelliSenseItem> suggestions, Table singleTable, ColumnDetails singleColumn)
{
string completeQuery = GetCompleteQueryPrefix(result);
bool inclusive = (lastTerm.Operator == Operator.LessThanOrEqual || lastTerm.Operator == Operator.GreaterThan);
bool reverse = (lastTerm.Operator == Operator.GreaterThan || lastTerm.Operator == Operator.GreaterThanOrEqual);
// Recommend the top ten values in the column with the prefix typed so far
DataBlockResult distribution = singleTable.Query(new DistributionQuery(singleColumn.Name, completeQuery, inclusive));
if (distribution.Total == 0 || distribution.Details.Succeeded == false)
{
return;
}
int countSoFar;
if (reverse)
{
countSoFar = (int)distribution.Values[distribution.Values.RowCount - 1, 1];
for (int i = distribution.Values.RowCount - 2; i >= 0; --i)
{
string value = distribution.Values[i, 0].ToString();
double frequency = (double)countSoFar / (double)(distribution.Total);
int countForRange = (int)distribution.Values[i, 1];
if ((distribution.Values.RowCount == 2 || (int)distribution.Values[i + 1, 1] > 0) && value.StartsWith(guidance.Value, StringComparison.OrdinalIgnoreCase))
{
suggestions.Add(new IntelliSenseItem(QueryTokenCategory.Value, QueryParser.WrapValue(distribution.Values[i, 0]), countSoFar, distribution.Total));
}
countSoFar += countForRange;
}
}
else
{
countSoFar = 0;
for (int i = 0; i < distribution.Values.RowCount - 1; ++i)
{
string value = distribution.Values[i, 0].ToString();
int countForRange = (int)distribution.Values[i, 1];
countSoFar += countForRange;
double frequency = (double)countSoFar / (double)(distribution.Total);
if ((distribution.Values.RowCount == 2 || countForRange > 0) && value.StartsWith(guidance.Value, StringComparison.OrdinalIgnoreCase))
{
suggestions.Add(new IntelliSenseItem(QueryTokenCategory.Value, QueryParser.WrapValue(distribution.Values[i, 0]), countSoFar, distribution.Total));
}
}
}
}
public DoubleEvaluator(Func <T, double> getter, TermExpression term)
{
_getter = getter;
if (!double.TryParse(term.Value, out double parsedValue))
{
throw new QueryParseException($"{term} value {term.Value} was not a valid floating point number.");
}
_value = parsedValue;
_evaluateSet = Comparer(term);
}
public EnumEvaluator(Func <T, EnumType> getter, TermExpression term)
{
_getter = getter;
if (!Enum.TryParse <EnumType>(term.Value, out EnumType parsedValue))
{
throw new QueryParseException($"{term} value {term.Value} was not a valid {typeof(EnumType).Name}.");
}
_value = parsedValue;
_evaluateSet = Comparer(term);
}
public LongEvaluator(Func <T, long> getter, TermExpression term)
{
_getter = getter;
if (!long.TryParse(term.Value, out long parsedValue))
{
throw new QueryParseException($"{term} value {term.Value} was not a valid number.");
}
Value = parsedValue;
_evaluateSet = Comparer(term);
}
public override IExpression CorrectTerm(TermExpression te)
{
string value = te.Value.ToString();
if (value.Equals("me", StringComparison.OrdinalIgnoreCase) && te.Operator.IsOrCorrectableOperator())
{
// Correct 'me' to the current user alias, if seen
return(new OrExpression(te, new TermExpression(te.ColumnName, te.Operator, this.UserAlias)));
}
return(null);
}
private Action <ICollection <T>, BitArray> Comparer(TermExpression term)
{
switch (term.Operator)
{
case CompareOperator.Equals:
return(EvaluateEquals);
case CompareOperator.NotEquals:
return(EvaluateNotEquals);
default:
throw new QueryParseException($"In {term}, {term.PropertyName} only supports equals and not equals, not operator {term.Operator}");
}
}
/// <summary>
/// BuildPrimitiveEvaluator will build an IExpressionEvaluator for supported primitive
/// types, set up to work directly on an array of primitives. you can use BuildPrimitiveEvaluator(typeof(int),
/// </summary>
/// <example>
/// TermExpression term = ExpressionParser.Parse("value > 5");
/// IExpressionEvaluator<int> evaluator = BuildPrimitiveEvaluator(typeof(int), term);
///
/// int[] set;
/// BitArray matches = new BitArray(set.Length);
/// evaluator.Evaluate(set, matches);
/// </example>
/// <param name="fieldType">Primitive type of array to build evaluator for</param>
/// <param name="term">Query term with comparison and constant to evaluate against array</param>
/// <returns>IExpressionEvaluator for appropriate type</returns>
public static object BuildPrimitiveEvaluator(Type fieldType, TermExpression term)
{
if (fieldType == typeof(bool))
{
return(new BoolEvaluator <bool>(value => value, term));
}
else if (fieldType == typeof(double))
{
return(new DoubleEvaluator <double>(value => value, term));
}
else if (fieldType == typeof(float))
{
return(new DoubleEvaluator <float>(value => (double)value, term));
}
else if (fieldType == typeof(long))
{
return(new LongEvaluator <long>(value => value, term));
}
else if (fieldType == typeof(int))
{
return(new LongEvaluator <int>(value => (long)value, term));
}
else if (fieldType == typeof(uint))
{
return(new LongEvaluator <uint>(value => (long)value, term));
}
else if (fieldType == typeof(short))
{
return(new LongEvaluator <short>(value => (long)value, term));
}
else if (fieldType == typeof(ushort))
{
return(new LongEvaluator <ushort>(value => (long)value, term));
}
else if (fieldType == typeof(byte))
{
return(new LongEvaluator <byte>(value => (long)value, term));
}
else if (fieldType == typeof(sbyte))
{
return(new LongEvaluator <sbyte>(value => (long)value, term));
}
else if (fieldType == typeof(string))
{
// Default StringComparison only
return(new StringEvaluator <string>(value => value, term, StringComparison.OrdinalIgnoreCase));
}
throw new NotImplementedException($"BuildPrimitiveEvaluator not implemented for type {fieldType.FullName}.");
}
public static IExpressionEvaluator <Result> ResultEvaluator(TermExpression term)
{
switch (term.PropertyName.ToLowerInvariant())
{
case "baselinestate":
return(new EnumEvaluator <Result, BaselineState>(r => r.BaselineState, term));
case "correlationguid":
return(new StringEvaluator <Result>(r => r.CorrelationGuid, term, StringComparison.OrdinalIgnoreCase));
case "guid":
return(new StringEvaluator <Result>(r => r.Guid, term, StringComparison.OrdinalIgnoreCase));
case "hostedvieweruri":
return(new StringEvaluator <Result>(r => r.HostedViewerUri?.ToString(), term, StringComparison.OrdinalIgnoreCase));
case "kind":
return(new EnumEvaluator <Result, ResultKind>(r => r.Kind, term));
case "level":
return(new EnumEvaluator <Result, FailureLevel>(r => r.Level, term));
case "message.text":
return(new StringEvaluator <Result>(r => r.Message?.Text, term, StringComparison.OrdinalIgnoreCase));
case "occurrencecount":
return(new LongEvaluator <Result>(r => r.OccurrenceCount, term));
case "rank":
return(new DoubleEvaluator <Result>(r => r.Rank, term));
case "ruleid":
return(new StringEvaluator <Result>(r => r.GetRule(r.Run).Id, term, StringComparison.OrdinalIgnoreCase));
case "uri":
// Ensure the Run is provided, to look up Uri from Run.Artifacts when needed.
// Uri : "/Core/" will match all Results with any Uri which contains "/Core/"
return(new SetEvaluator <Result, string>(r =>
{
r.EnsureRunProvided();
return r.Locations?.Select(l => l?.PhysicalLocation?.ArtifactLocation.Resolve(r.Run)?.Uri?.ToString() ?? "");
}, term));
default:
throw new QueryParseException($"Property Name {term.PropertyName} unrecognized. Known Names: baselineState, correlationGuid, guid, hostedViewerUri, kind, level, message.text, occurrenceCount, rank, ruleId");
}
}
public override IExpression CorrectTerm(TermExpression te)
{
if (te == null)
{
throw new ArgumentNullException("te");
}
string fullColumnName;
if (_columnNameMappings.TryGetValue(te.ColumnName, out fullColumnName))
{
// NOTE: We change the TermExpression directly rather than replacing it
te.ColumnName = fullColumnName;
}
return(null);
}
public override IExpression CorrectTerm(TermExpression te)
{
if (te == null)
{
throw new ArgumentNullException("te");
}
// Look for a join term in the query
string value = te.Value.ToString();
if (value.StartsWith("#Q"))
{
Regex referenceExpression = new Regex(@"#Q(?<number>\d+)\[(?<columnName>[^\]]+)\]");
Match m = referenceExpression.Match(value);
if (m.Success)
{
int referencedQuery = int.Parse(m.Groups["number"].Value);
string referencedColumn = m.Groups["columnName"].Value;
// Get the referenced query and recursively Join it, if required [1-based]
SelectQuery joinQuery = this.Queries[referencedQuery - 1];
joinQuery.Correct(this.NestedCorrector);
joinQuery.Correct(this);
// Ask for the Join column and maximum number of values
joinQuery.Columns = new string[] { referencedColumn };
joinQuery.Count = ushort.MaxValue;
// Run the query
Table t = this.DB[joinQuery.TableName];
SelectResult result = t.Query(joinQuery);
if (result.Total == 0)
{
return(new TermExpression(te.ColumnName, te.Operator, String.Empty));
}
else
{
return(new TermInExpression(te.ColumnName, te.Operator, result.Values.GetColumn(0)));
}
}
}
return(null);
}
public override IExpression CorrectTerm(TermExpression te)
{
if (te == null)
{
throw new ArgumentNullException("te");
}
if (te.ColumnName.Equals("*"))
{
return(new AllExceptColumnsTermExpression(_restrictedColumns, te));
}
if (_restrictedColumns.Contains(te.ColumnName))
{
throw new ArribaColumnAccessDeniedException(te.ColumnName);
}
return(null);
}
private IExpression NextTerm(IXTable source, XDatabaseContext context)
{
IExpression term;
bool negate = false;
// Look for NOT
if (_scanner.Current.Value.TryParseNot())
{
_scanner.Next();
negate = true;
}
// Look for nested subexpression
if (_scanner.Current.Type == TokenType.OpenParen)
{
// Consume the open paren
_scanner.Next();
term = NextExpression(source, context);
// Consume the close paren (and tolerate it missing - partially typed queries)
if (_scanner.Current.Type == TokenType.CloseParen)
{
_scanner.Next();
}
}
else
{
// Otherwise, it's a simple term
term = new TermExpression(
source,
NextColumn(source, context),
NextCompareOperator(),
NextColumn(source, context));
}
if (negate)
{
return(new NotExpression(term));
}
return(term);
}
public static IExpressionEvaluator <Result> ResultEvaluator(TermExpression term)
{
switch (term.PropertyName.ToLowerInvariant())
{
case "baselinestate":
return(new EnumEvaluator <Result, BaselineState>(r => r.BaselineState, term));
case "correlationguid":
return(new StringEvaluator <Result>(r => r.CorrelationGuid, term, StringComparison.OrdinalIgnoreCase));
case "guid":
return(new StringEvaluator <Result>(r => r.Guid, term, StringComparison.OrdinalIgnoreCase));
case "hostedvieweruri":
return(new StringEvaluator <Result>(r => r.HostedViewerUri?.ToString(), term, StringComparison.OrdinalIgnoreCase));
case "kind":
return(new EnumEvaluator <Result, ResultKind>(r => r.Kind, term));
case "level":
return(new EnumEvaluator <Result, FailureLevel>(r => r.Level, term));
case "message.text":
return(new StringEvaluator <Result>(r => r.Message?.Text, term, StringComparison.OrdinalIgnoreCase));
case "occurrencecount":
return(new LongEvaluator <Result>(r => r.OccurrenceCount, term));
case "rank":
return(new DoubleEvaluator <Result>(r => r.Rank, term));
case "ruleid":
return(new StringEvaluator <Result>(r => r.RuleId ?? r.Rule?.Id, term, StringComparison.OrdinalIgnoreCase));
default:
throw new QueryParseException($"Property Name {term.PropertyName} unrecognized. Known Names: baselineState, correlationGuid, guid, hostedViewerUri, kind, level, message.text, occurrenceCount, rank, ruleId");
}
}
public BoolEvaluator(Func <T, bool> getter, TermExpression term)
{
Getter = getter;
if (!bool.TryParse(term.Value, out bool parsedValue))
{
throw new QueryParseException($"{term} value {term.Value} was not a valid boolean.");
}
MustEqual = parsedValue;
switch (term.Operator)
{
case CompareOperator.Equals:
break;
case CompareOperator.NotEquals:
MustEqual = !MustEqual;
break;
default:
throw new QueryParseException($"In {term}, {term.PropertyName} is boolean and only supports equals and not equals, not operator {term.Operator}");
}
}
private static void AddTopColumnValues(IntelliSenseResult result, TermExpression lastTerm, IntelliSenseGuidance guidance, List <IntelliSenseItem> suggestions, Table singleTable, ColumnDetails singleColumn)
{
// Lame, to turn single terms into AllQuery [normally they return nothing]
string completeQuery = QueryParser.Parse(result.Complete).ToString();
// Recommend the top ten values in the column with the prefix typed so far
DistinctResult topValues = singleTable.Query(new DistinctQueryTop(singleColumn.Name, completeQuery, 10));
int total = (int)topValues.Total;
if (topValues.Total == 0)
{
return;
}
// Walk values in order for ==, :, ::, backwards with inverse percentages for !=
bool isNotEquals = lastTerm.Operator == Operator.NotEquals;
int start = isNotEquals ? topValues.Values.RowCount - 1 : 0;
int end = isNotEquals ? -1 : topValues.Values.RowCount;
int step = isNotEquals ? -1 : 1;
for (int i = start; i != end; i += step)
{
string value = topValues.Values[i, 0].ToString();
int countForValue = (int)topValues.Values[i, 1];
if (isNotEquals)
{
countForValue = (int)topValues.Total - countForValue;
}
double frequency = (double)countForValue / (double)(topValues.Total);
if ((countForValue > 1 || total <= 10) && value.StartsWith(guidance.Value, StringComparison.OrdinalIgnoreCase))
{
string hint = (countForValue == topValues.Total ? "all" : frequency.ToString("P0"));
suggestions.Add(new IntelliSenseItem(QueryTokenCategory.Value, QueryScanner.WrapValue(value), hint));
}
}
}
public PropertyBagPropertyEvaluator(TermExpression term)
{
Match match = s_propertyNameRegex.Match(term.PropertyName);
_propertyName = match.Groups["name"].Value;
string prefix = match.Groups["prefix"].Value;
if (prefix.Equals(RulePropertyPrefix))
{
_propertyBelongsToRule = true;
}
else if (!prefix.Equals(ResultPropertyPrefix))
{
throw new ArgumentException(
string.Format(
CultureInfo.CurrentCulture,
SdkResources.ErrorInvalidQueryPropertyPrefix,
"'" + string.Join("', '", ResultPropertyPrefix, RulePropertyPrefix)) + "'",
nameof(term));
}
_evaluator = CreateEvaluator(term);
}
private static bool TryFindSingleMatchingColumn(IReadOnlyCollection <Table> targetTables, TermExpression lastTerm, out Table matchTable, out ColumnDetails matchColumn)
{
matchTable = null;
matchColumn = null;
if (lastTerm == null || String.IsNullOrEmpty(lastTerm.ColumnName) || lastTerm.ColumnName == "*")
{
return(false);
}
foreach (Table table in targetTables)
{
foreach (ColumnDetails column in table.ColumnDetails)
{
if (column.Name.Equals(lastTerm.ColumnName, StringComparison.OrdinalIgnoreCase))
{
// If there's already a match, we have multiple matches
if (matchColumn != null)
{
matchTable = null;
matchColumn = null;
return(false);
}
matchTable = table;
matchColumn = column;
}
}
}
return(matchColumn != null);
}
/// <summary>
/// Get the grammatical categories and value being completed at the given query position.
/// This is the pure grammar part of IntelliSense determination.
/// </summary>
/// <param name="queryBeforeCursor">Query up to where the cursor is placed</param>
/// <param name="lastTerm">The TermExpression in progress as parsed</param>
/// <returns>IntelliSenseGuidance showing the token in progress and possible grammar categories for it</returns>
internal IntelliSenseGuidance GetCurrentTokenOptions(string queryBeforeCursor, out TermExpression lastTerm, out IExpression query)
{
lastTerm = null;
query = null;
IntelliSenseGuidance defaultGuidance = new IntelliSenseGuidance(String.Empty, QueryTokenCategory.Term);
// If the query is empty, return the guidance for the beginning of the first term
if (String.IsNullOrEmpty(queryBeforeCursor))
{
return(defaultGuidance);
}
// Parse the query, asking for hint terms
query = QueryParser.Parse(queryBeforeCursor, true);
// If the query had parse errors, return empty guidance
if (query is EmptyExpression)
{
return(new IntelliSenseGuidance(String.Empty, QueryTokenCategory.None));
}
// Get the last query term to look at the IntelliSense guidance
lastTerm = query.GetLastTerm();
// If no last term, return first term guidance (ex: inside new '('
if (lastTerm == null)
{
return(defaultGuidance);
}
// Otherwise, grab the last term guidance
IntelliSenseGuidance guidance = lastTerm.Guidance;
return(guidance);
}
private static void AddSuggestionsForTerm(IReadOnlyCollection <Table> targetTables, IntelliSenseResult result, TermExpression lastTerm, IntelliSenseGuidance guidance, List <IntelliSenseItem> suggestions)
{
if (lastTerm != null && lastTerm.ColumnName == "*")
{
object termValue = lastTerm.Value;
List <Tuple <string, int, int> > columnsForTerm = new List <Tuple <string, int, int> >();
foreach (Table table in targetTables)
{
DataBlockResult columns = table.Query(new TermInColumnsQuery(termValue.ToString(), GetCompleteQueryPrefix(result)));
for (int i = 0; i < columns.Values.RowCount; ++i)
{
columnsForTerm.Add(new Tuple <string, int, int>((string)columns.Values[i, 0], (int)columns.Values[i, 1], (int)columns.Total));
}
}
// Sort overall set by frequency descending
columnsForTerm.Sort((left, right) => ((double)right.Item2 / (double)right.Item3).CompareTo((double)left.Item2 / (double)left.Item3));
// Add top 10 suggestions
int countToReturn = Math.Min(10, columnsForTerm.Count);
for (int i = 0; i < countToReturn; ++i)
{
suggestions.Add(new IntelliSenseItem(QueryTokenCategory.ColumnName, QueryParser.WrapColumnName(columnsForTerm[i].Item1) + " : " + QueryParser.WrapValue(termValue), columnsForTerm[i].Item2, columnsForTerm[i].Item3));
}
}
}
private static void AddSuggestionsForValue(IReadOnlyCollection <Table> targetTables, IntelliSenseResult result, TermExpression lastTerm, IntelliSenseGuidance guidance, ref bool spaceIsSafeCompletionCharacter, List <IntelliSenseItem> suggestions)
{
Table singleTable;
ColumnDetails singleColumn;
if (!TryFindSingleMatchingColumn(targetTables, lastTerm, out singleTable, out singleColumn))
{
// If more than one table has the column, we can't recommend anything
result.SyntaxHint = Value;
}
else
{
if (lastTerm.Operator == Operator.Equals || lastTerm.Operator == Operator.NotEquals || lastTerm.Operator == Operator.Matches || lastTerm.Operator == Operator.MatchesExact)
{
AddTopColumnValues(result, lastTerm, guidance, suggestions, singleTable, singleColumn);
}
else if (lastTerm.Operator == Operator.LessThan || lastTerm.Operator == Operator.LessThanOrEqual || lastTerm.Operator == Operator.GreaterThan || lastTerm.Operator == Operator.GreaterThanOrEqual)
{
AddValueDistribution(result, lastTerm, guidance, suggestions, singleTable, singleColumn);
}
Type columnType = singleTable.GetColumnType(singleColumn.Name);
if (columnType == typeof(ByteBlock))
{
result.SyntaxHint = StringValue;
}
else if (columnType == typeof(bool))
{
if (suggestions.Count == 0)
{
AddWhenPrefixes(BooleanValues, guidance.Value, suggestions);
}
spaceIsSafeCompletionCharacter = true;
}
else if (columnType == typeof(DateTime))
{
result.SyntaxHint = DateTimeValue;
}
else if (columnType == typeof(TimeSpan))
{
result.SyntaxHint = TimeSpanValue;
}
else if (columnType == typeof(float) || columnType == typeof(double))
{
result.SyntaxHint = FloatValue;
}
else if (columnType == typeof(byte) || columnType == typeof(sbyte) || columnType == typeof(short) || columnType == typeof(ushort) || columnType == typeof(int) || columnType == typeof(uint) || columnType == typeof(long) || columnType == typeof(ulong))
{
result.SyntaxHint = IntegerValue;
}
else
{
result.SyntaxHint = String.Format("<{0}>", columnType.Name);
}
}
}