/// <summary>
/// Parse and compile string expression and return BsonExpression
/// </summary>
internal static BsonExpression Parse(Tokenizer tokenizer, BsonExpressionParserMode mode, bool isRoot)
{
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
var source = Expression.Parameter(typeof(IEnumerable <BsonDocument>), "source");
var root = Expression.Parameter(typeof(BsonDocument), "root");
var current = Expression.Parameter(typeof(BsonValue), "current");
var parameters = Expression.Parameter(typeof(BsonDocument), "parameters");
var expr =
mode == BsonExpressionParserMode.Full ? BsonExpressionParser.ParseFullExpression(tokenizer, source, root, current, parameters, isRoot) :
mode == BsonExpressionParserMode.Single ? BsonExpressionParser.ParseSingleExpression(tokenizer, source, root, current, parameters, isRoot) :
mode == BsonExpressionParserMode.SelectDocument ? BsonExpressionParser.ParseSelectDocumentBuilder(tokenizer, source, root, current, parameters) :
BsonExpressionParser.ParseUpdateDocumentBuilder(tokenizer, source, root, current, parameters);
// before compile try find in cache if this source already has in cache (already compiled)
var cached = _cache.GetOrAdd(expr.Source, (s) =>
{
// compile linq expression (with left+right expressions)
Compile(expr, source, root, current, parameters);
return(expr);
});
return(cached);
}
/// <summary>
/// Parse and compile string expression and return BsonExpression
/// </summary>
internal static BsonExpression Parse(Tokenizer tokenizer, BsonExpressionParserMode mode, bool isRoot)
{
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
var context = new ExpressionContext();
var expr =
mode == BsonExpressionParserMode.Full ? BsonExpressionParser.ParseFullExpression(tokenizer, context, isRoot) :
mode == BsonExpressionParserMode.Single ? BsonExpressionParser.ParseSingleExpression(tokenizer, context, isRoot) :
mode == BsonExpressionParserMode.SelectDocument ? BsonExpressionParser.ParseSelectDocumentBuilder(tokenizer, context) :
BsonExpressionParser.ParseUpdateDocumentBuilder(tokenizer, context);
// before compile try find in cache if this source already has in cache (already compiled)
var cached = _cache.GetOrAdd(expr.Source, (s) =>
{
// compile linq expression (with left+right expressions)
Compile(expr, context);
return(expr);
});
return(cached);
}
/// <summary>
/// Parse tokenizer and create new instance of BsonExpression - for now, do not use cache
/// </summary>
internal static BsonExpression Create(Tokenizer tokenizer, BsonExpressionParserMode mode, BsonDocument parameters)
{
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
return(ParseAndCompile(tokenizer, mode, parameters, DocumentScope.Root));
}
/// <summary>
/// Parse and compile string expression and return BsonExpression
/// </summary>
internal static BsonExpression ParseAndCompile(Tokenizer tokenizer, BsonExpressionParserMode mode, BsonDocument parameters, DocumentScope scope)
{
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
var context = new ExpressionContext();
var expr =
mode == BsonExpressionParserMode.Full ? BsonExpressionParser.ParseFullExpression(tokenizer, context, parameters, scope) :
mode == BsonExpressionParserMode.Single ? BsonExpressionParser.ParseSingleExpression(tokenizer, context, parameters, scope) :
mode == BsonExpressionParserMode.SelectDocument ? BsonExpressionParser.ParseSelectDocumentBuilder(tokenizer, context, parameters) :
BsonExpressionParser.ParseUpdateDocumentBuilder(tokenizer, context, parameters);
// compile linq expression (with left+right expressions)
Compile(expr, context);
return(expr);
}
/// <summary>
/// Parse tokenizer and create new instance of BsonExpression - for now, do not use cache
/// </summary>
internal static BsonExpression Create(Tokenizer tokenizer, BsonDocument parameters, BsonExpressionParserMode mode)
{
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
var expr = Parse(tokenizer, mode, true);
// return a copy from cache using new Parameters
return(new BsonExpression
{
Expression = expr.Expression,
IsImmutable = expr.IsImmutable,
UseSource = expr.UseSource,
IsScalar = expr.IsScalar,
Parameters = parameters ?? new BsonDocument(),
Fields = expr.Fields,
Left = expr.Left,
Right = expr.Right,
Source = expr.Source,
Type = expr.Type,
_func = expr._func,
_funcScalar = expr._funcScalar
});
}
