adaptive-expressions
Version:
Common Expression Language
58 lines • 2.37 kB
JavaScript
;
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.ComparisonEvaluator = void 0;
const __1 = require("../");
const expressionEvaluator_1 = require("../expressionEvaluator");
const functionUtils_1 = require("../functionUtils");
const returnType_1 = require("../returnType");
/**
* Comparison operators.
* A comparison operator returns false if the comparison is false, or there is an error. This prevents errors from short-circuiting boolean expressions.
*/
class ComparisonEvaluator extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [ComparisonEvaluator](xref:adaptive-expressions.ComparisonEvaluator) class.
*
* @param type Name of the built-in function.
* @param func The comparison function, it takes a list of objects and returns a boolean.
* @param validator [ValidateExpressionDelegate](xref:adaptive-expressions.ValidateExpressionDelegate) for input arguments.
* @param verify Optional. [VerifyExpression](xref:adaptive-expressions.VerifyExpression) function to verify each child's result.
*/
constructor(type, func, validator, verify) {
super(type, ComparisonEvaluator.evaluator(func, verify), returnType_1.ReturnType.Boolean, validator);
}
/**
* @private
*/
static evaluator(func, verify) {
return (expression, state, options) => {
let result = false;
const newOptions = new __1.Options(options);
newOptions.nullSubstitution = undefined;
const { args, error: childrenError } = functionUtils_1.FunctionUtils.evaluateChildren(expression, state, newOptions, verify);
let error = childrenError;
if (!error) {
try {
result = func(args);
}
catch (e) {
// NOTE: This should not happen in normal execution
error = e.message;
}
}
else {
error = undefined;
}
return { value: result, error };
};
}
}
exports.ComparisonEvaluator = ComparisonEvaluator;
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