commit 222077f6c263ef7d28e3ac8a4d88fc1564f43724
Author: Victor Batischev <vitek.batishev97@gmail.com>
Date:   Wed Oct 11 15:13:40 2023 +0300

    init commit

diff --git a/fieldChecks.ts b/fieldChecks.ts
new file mode 100644
index 0000000..fe7744a
--- /dev/null
+++ b/fieldChecks.ts
@@ -0,0 +1,68 @@
+export class FieldCheck {
+    error = "";
+
+    constructor(error: string) {
+        this.error = error;
+    }
+
+    check(val: string) {
+        throw new Error("check() not implemented");
+        return "";
+    }
+}
+
+class FieldCheckRegex extends FieldCheck {
+    regex = /none/;
+
+    constructor(regex: RegExp, error: string) {
+        super(error);
+        this.regex = regex;
+    }
+
+    check(val: string) {
+        if (!this.regex.test(val)) return this.error;
+        return "";
+    }
+}
+
+class FieldCheckMaxLength extends FieldCheck {
+    maxLength = 0;
+
+    constructor(maxLength: number) {
+        super(`Максимальная длина равна ${maxLength}.`);
+        this.maxLength = maxLength;
+    }
+
+    check(val: string) {
+        if (val.length > this.maxLength) return this.error;
+        return "";
+    }
+}
+
+class FieldCheckMinLength extends FieldCheck {
+    minLength = 0;
+
+    constructor(minLength: number) {
+        super(`Минимальная длина равна ${minLength}.`);
+        this.minLength = minLength;
+    }
+
+    check(val: string) {
+        if (val.length < this.minLength) return this.error;
+        return "";
+    }
+}
+
+export class FieldChecks {
+    static nonEmpty = new FieldCheckRegex(/\S+/, "Поле не может быть пустым.");
+    static onlyLatinLettersWhitespaces = new FieldCheckRegex(/^[A-Za-z\s]+$/, "Разрешены только Латинские буквы и пробелы.");
+    static onlyLettersWhitespaces = new FieldCheckRegex(/^[A-Za-zА-Яа-я\s]+$/, "Разрешены только буквы и пробелы.");
+    static onlyLatinLettersNumbersUnderscores = new FieldCheckRegex(
+        /^[A-Za-z0-9_\s]+$/,
+        "Разрешены только Латинские буквы, цифры и нижнее подчёркивание."
+    );
+    static email = new FieldCheckRegex(/^[^\s@]+@[^\s@]+\.[^\s@]+$/, "Проверьте почтовый адрес.");
+    static noSpecialChars = new FieldCheckRegex(/^[A-Za-z0-9\s.,()!%]+$/, "Специальные символы не разрешены.");
+    static maxLength = (maxLength: number) => new FieldCheckMaxLength(maxLength);
+    static minLength = (minLength: number) => new FieldCheckMinLength(minLength);
+}
diff --git a/formFields.ts b/formFields.ts
new file mode 100644
index 0000000..2764186
--- /dev/null
+++ b/formFields.ts
@@ -0,0 +1,45 @@
+import { FieldCheck } from "./fieldChecks";
+
+export class FieldsContainer {
+    fields = new Map<string, Field>();
+
+    /**
+     * Add field to container.
+     * @param {string} name - The field name.
+     * @param {string} value - The field value.
+     * @param {Array} checks - Array of necessary FieldCheck objects.
+     */
+    addField(name: string, value: string, checks: FieldCheck[]) {
+        this.fields.set(name, new Field(value, checks));
+    }
+}
+
+export class Field {
+    value: string;
+    checks: FieldCheck[];
+
+    constructor(value: string, checks: FieldCheck[]) {
+        this.value = value;
+        this.checks = checks;
+    }
+
+    tryGetFirstError() {
+        let result = "";
+
+        this.checks.every((fieldCheck) => {
+            result = fieldCheck.check(this.value);
+            return result === ""; //break or continue every()
+        });
+
+        return result;
+    }
+
+    tryGetAllErrors() {
+        const result = this.checks.flatMap((fieldCheck) => {
+            const err = fieldCheck.check(this.value);
+            return err === "" ? [] : [err];
+        });
+
+        return result.join(", ");
+    }
+}
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..db2a797
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,4 @@
+import { FieldChecks } from "./fieldChecks";
+import { Field, FieldsContainer } from "./formFields";
+
+export { FieldChecks, Field, FieldsContainer };
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..1f63156
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,2 @@
+export { FieldChecks } from "./fieldChecks";
+export { Field, FieldsContainer } from "./formFields";