MyParser class - wapform_expression library

Constructors

MyParser(): Creates a parser with the built-in functions registered.

Properties

datasetResolver ↔ ExprDataSet? Function(String name)?: Resolves dataset names used in expressions (ds.field).
getter/setter pair
error ↔ String: Error message of the last evaluation ('' when none).
getter/setter pair
expression ↔ String: The expression to evaluate.
getter/setter pair
hashCode → int: The hash code for this object.
no setterinherited
nul ↔ bool: Null-substitution mode: unknown names evaluate to null instead of failing.
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
value ↔ dynamic: Result of the last evaluation.
getter/setter pair

Methods

addFunction0Param(String name, Func0 fn) → void: Registers a function without parameters; an existing one of the same name is kept.
addFunction1Param(String name, Func1 fn) → void: Registers a one-parameter function; an existing one of the same name is kept.
addFunction2Param(String name, Func2 fn) → void: Registers a two-parameter function; an existing one of the same name is kept.
addFunction3Param(String name, Func3 fn) → void: Registers a three-parameter function; an existing one of the same name is kept.
addFunction4Param(String name, Func4 fn) → void: Registers a four-parameter function; an existing one of the same name is kept.
addFunctionAParam(String name, FuncA fn) → void: Registers a variadic function; an existing one of the same name is kept.
addInternalFunctions() → void: Registers the built-in function library.
analyzeExpression() → bool: Evaluates expression into value; returns false and sets error on failure.
clearDataSets() → void: Removes every registered dataset.
clearIdentifiers() → void: Removes every variable and function.
clearUserVars() → void: Clears only user variables (variable/constant), keeps built-in functions (function_)
delVar(String name) → void: Deletes variable name.
findDataSet(String name) → ExprDataSet?: The dataset called name, or null.
findIdent(String name) → int: Index of identifier name, or -1.
getUserVars() → Map<String, dynamic>: Gets all user-set variables
getVar(String name) → dynamic: Value of variable name, or null.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
registerDataSet(String name, ExprDataSet ds) → void: Makes ds available to expressions as name.
setAry(String name, int index, dynamic val) → void: Sets element index of array variable name.
setVar(String name, dynamic value) → void: Sets variable name to value (not evaluated).
toString() → String: A string representation of this object.
inherited
unregisterDataSet(String name) → void: Removes the dataset registered as name.

Operators

operator ==(Object other) → bool: The equality operator.
inherited