ExpressionEngine Class

The base class of expression engines is used to dynamically produce an expression and get the result of the expression.

Inheritance

object

ExpressionEngine

ExcelEngine

VBAEngine

Implements

IExpressionEngine

IEngineExtended

IEngineExpressionItems

ISupportAliases

ISupportCustomFunctions

Namespace: C1.CalcEngine.ExpressionEngine

Assembly: C1.CalcEngine.dll

Syntax

public abstract class ExpressionEngine : IExpressionEngine, IEngineExtended, IEngineExpressionItems, ISupportAliases, ISupportCustomFunctions

Public MustInherit Class ExpressionEngine
    Implements IExpressionEngine, IEngineExtended, IEngineExpressionItems, ISupportAliases, ISupportCustomFunctions

Constructors

Name	Description
ExpressionEngine()	Initializes a new instance of the ExpressionEngine class.

Properties

Name	Description
CultureInfo	Gets or sets the CultureInfo to use when parsing numbers and dates.
CurrentIndex	Gets or sets the index of the entry from data source.
CurrentPosition	Current pointer into expression.
DataSource	Gets or sets the object used as the data source.
DecimalSeparator	Gets a localized decimal separator.
Expression	Gets or sets the expression string.
IsValid	Gets a value that indicates whether the expression is valid.
ListSeparator	Gets a localized list separator.
OptimizedExpression	Expression being parsed.
Syntax	Gets an object containing the syntax of the expression engine.

Methods

Name	Description
AddAlias(string, string)	Adds an alias for a field from DataSource.
AddError(int, int, ErrorType)	Adds an error to the error collection.
AddFunction(List<ExpressionItem>, Func<List<object>, object>, int, int)	Adds a custom function.
ClearCachedExpression()	Clears the cached expression.
Evaluate()	Gets a result of expression.
GetBinaryExpression(Token, IExpression, IExpression)	Gets a binary expression.
GetBindingExpression(IEnumerable<PropertyInfo>, IEnumerable<string>)	Gets a binding expression.
GetCustomFunctionExpression(string, CustomFunctionDefinition, List<IExpression>)	Gets a custom function expression.
GetErrors()	Gets a enumerator of ErrorInfo objects.
GetExpressionItems()	Gets a enumerator of ExpressionItem of the current context.
GetFieldNames()	Gets the data source field names.
GetFunctionExpression(string, FunctionDefinition, List<IExpression>)	Gets a function expression.
GetInExpression(List<IExpression>, IExpression)	Gets a IN expression.
GetIndex()	Gets the index of the collection object.
GetItemsCount(IExpression)	Gets a count of data source items.
GetObjectName()	Gets the name of the data field for the current token.
GetUnaryExpression(Token, IExpression)	Gets a unary expression.
GetValue(IEnumerable<object>)	Gets a value from data source.
GetVariableExpression(IDictionary<string, object>, string)	Gets a variable expression.
IsDot()	Checks the current token for the DOT type.
IsExpressionEnd(char)	Checks whether the character is the end of the expression.
IsLetter(char)	Checks if a character is a letter.
Parse()	Parses an Expression string.
ParseIdentifier(char, int)	Parses an identifier string.
ParseIdentifier(string)	Parses an identifier string.
ParsePostfix(string, int)	Parses postfix of expression.
ParsePrefix(string, int)	Parses prefix of expression.
TryAddAlias(string, string)	Tries to add an alias for a field from DataSource.
TryEvaluate(out object)	Gets a result of expression. A return value indicates whether the evaluate succeeded or failed.