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86 lines
2.8 KiB
JavaScript
86 lines
2.8 KiB
JavaScript
"use strict";
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const isArguments = require("is-arguments");
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const flatten = require("flatten");
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const asExpression = require("as-expression");
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const ValidationError = require("@validatem/error");
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const annotateErrors = require("@validatem/annotate-errors");
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const applyValidators = require("../apply-validators");
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const createValidationMethod = require("./validation-method");
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// TODO: Simplify below by treating it like an array or object? Or would that introduce too much complexity through specialcasing?
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// TODO: Find a way to produce validatem-style errors for the below invocation errors, without introducing recursion
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module.exports = createValidationMethod((args, argumentDefinitions) => {
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if (!isArguments(args)) {
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throw new Error(`First argument is not an 'arguments' object; maybe you forgot to put it before the validation rules?`);
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} else if (argumentDefinitions == null) {
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throw new Error(`Validation rules (second argument) are missing; maybe you forgot to specify them?`);
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} else {
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let usesArrayAPI = (Array.isArray(argumentDefinitions));
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let definitionCount = (usesArrayAPI)
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? argumentDefinitions.length
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: Object.keys(argumentDefinitions).length;
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if (args.length > definitionCount) {
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return {
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errors: [ new ValidationError(`Got ${args.length} arguments, but only expected ${definitionCount}`) ],
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// Cast the below to an array, for consistency with *success* output, in case we ever want to expose the new values to the user in an error case too.
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newValue: Array.from(args)
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};
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} else {
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let normalizedDefinitions = asExpression(() => {
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if (usesArrayAPI) {
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return argumentDefinitions.map((definition) => {
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let [ name, ...rules ] = definition;
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if (typeof name !== "string") {
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throw new Error("First item in the argument rules list must be the argument name");
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} else {
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return {
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name: name,
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rules: rules
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};
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}
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});
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} else {
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return Object.entries(argumentDefinitions).map(([ key, value ]) => {
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return {
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name: key,
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rules: value
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};
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});
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}
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});
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let results = normalizedDefinitions.map(({ name, rules }, i) => {
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let argument = args[i];
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let validatorResult = applyValidators(argument, rules);
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return {
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errors: annotateErrors({
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pathSegments: [ name ],
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errors: validatorResult.errors
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}),
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newValue: (validatorResult.newValue !== undefined)
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? validatorResult.newValue
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: argument
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};
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});
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let combinedErrors = results.map((result) => result.errors);
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let flattenedErrors = flatten(combinedErrors); // TODO: Switch to `Array#flat` once Node 10.x goes EOL (April 2021)
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let newValues = results.map((result) => result.newValue);
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return {
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errors: flattenedErrors,
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newValue: newValues
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};
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}
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}
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});
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