WapEvaluator class

Evaluates WapForm expressions (WML $(...), cnd=, value=).

Holds the variables of one card and nearly 600 built-in functions; custom functions can be added with addFunction*Param. Comparisons on both sides of AND/OR need parentheses: (qty>0) AND (price<100).

Constructors

WapEvaluator()

Properties

datasetResolver ↔ ExprDataSet? Function(String name)?

Resolves dataset names used in expressions; useEngine sets it to DataSetRegistry.resolveDataSet.

getter/setter pair

hasError → bool

Whether the last evaluation failed.

no setter

hashCode → int

The hash code for this object.

no setter, inherited

lastError ↔ String

Error message of the last evaluation ('' when none).

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

addFunction0Param(String name, Func0 fn) → void

Registers function name without parameters.

addFunction1Param(String name, Func1 fn) → void

Registers function name with one parameter.

addFunction2Param(String name, Func2 fn) → void

Registers function name with two parameters.

addFunction3Param(String name, Func3 fn) → void

Registers function name with three parameters.

addFunction4Param(String name, Func4 fn) → void

Registers function name with four parameters.

addFunctionAParam(String name, FuncA fn) → void

Registers function name taking any number of arguments.

clearDataSets() → void

Removes every registered dataset.

clearVars() → void

Clears all variables (keeps built-in functions)

cond(String expr) → bool

Evaluates a condition expression, returns bool. Returns false on failure.

eval(String expr, {bool nul = false}) → dynamic

Evaluates the expression, returns the result. Returns null on failure and sets lastError.

evalNul(String expr) → dynamic

eval's Null mode (corresponds to Expression(Str, True))

getUserVars() → Map<String, dynamic>

Gets all user-set variables (of type variable/constant)

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.

setRow(String table, Map<String, dynamic> row) → void

Sets a whole row of data at once (the Map's keys are variable names; supports the 'table.field' format)

setVar(String name, dynamic value) → void

Sets variable name to value as is (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