Changed to constructor functions

Validator.test.ts

@@ -14,15 +14,42 @@ import {
 
 Deno.test("validate schema (match)", async () => {
   const values: [any, Validatable][] = [
-    ["string", isString],
-    ["string", [isString]],
-    [["arr", "ay"], { [ArraySymbol]: isString }],
-    [{ foo: 3.1415, lorem: "ipsum" }, { foo: isNumber, lorem: [isString] }],
-    [{}, { optional: [isString] }],
-    [{ foo: { bar: "" } }, { foo: { bar: [isRequired, isString] } }],
-    [{ foo: { bar: "" } }, { foo: { bar: [isString] } }],
-    [{ foo: {} }, { foo: { bar: [isString] } }],
-    [{}, { foo: { bar: [isString] } }],
+    [
+      "string",
+      isString(),
+    ],
+    [
+      "string",
+      [isString()],
+    ],
+    [
+      ["arr", "ay"],
+      { [ArraySymbol]: isString() },
+    ],
+    [
+      { foo: 3.1415, lorem: "ipsum" },
+      { foo: isNumber(), lorem: [isString()] },
+    ],
+    [
+      {},
+      { optional: [isString()] },
+    ],
+    [
+      { foo: { bar: "" } },
+      { foo: { bar: [isRequired(), isString()] } },
+    ],
+    [
+      { foo: { bar: "" } },
+      { foo: { bar: [isString()] } },
+    ],
+    [
+      { foo: {} },
+      { foo: { bar: [isString()] } },
+    ],
+    [
+      {},
+      { foo: { bar: [isString()] } },
+    ],
   ];
   for (const [value, constraints] of values) {
     assertEquals([], await validate(value, constraints));
@@ -31,14 +58,38 @@ Deno.test("validate schema (match)", async () => {
 
 Deno.test("validate schema (no match)", async () => {
   const values: [any, Validatable][] = [
-    [6, isString],
-    [false, [isString]],
-    [["arr", ["ay"]], { [ArraySymbol]: isString }],
-    [{ foo: 3.1415, lorem: "ipsum" }, { foo: isInteger, lorem: [isString] }],
-    [{}, { required: [isRequired, isString] }],
-    [{ foo: { bar: 1 } }, { foo: { bar: [isRequired, isString] } }],
-    [{ foo: {} }, { foo: { bar: [isRequired, isString] } }],
-    [{}, { foo: { bar: [isRequired, isString] } }],
+    [
+      6,
+      isString(),
+    ],
+    [
+      false,
+      [isString()],
+    ],
+    [
+      ["arr", ["ay"]],
+      { [ArraySymbol]: isString() },
+    ],
+    [
+      { foo: 3.1415, lorem: "ipsum" },
+      { foo: isInteger(), lorem: [isString()] },
+    ],
+    [
+      {},
+      { required: [isRequired(), isString()] },
+    ],
+    [
+      { foo: { bar: 1 } },
+      { foo: { bar: [isRequired(), isString()] } },
+    ],
+    [
+      { foo: {} },
+      { foo: { bar: [isRequired(), isString()] } },
+    ],
+    [
+      {},
+      { foo: { bar: [isRequired(), isString()] } },
+    ],
   ];
   for (const [value, constraints] of values) {
     assertNotEquals([], await validate(value, constraints));

Validator.ts

@@ -2,6 +2,7 @@ export type Args = { [_: string]: any };
 
 export interface Validator {
   type: string;
+  extends?: Validator[];
   check: (value: any) => Promise<Args | undefined> | Args | undefined;
   message: (
     value: any,
@@ -54,6 +55,13 @@ async function validateValue(
   }
   const result: ValidationError[] = [];
   for (const validator of validators) {
+    if (validator.extends) {
+      const prerequisites = await validate(value, validator.extends);
+      if (prerequisites.length > 0) {
+        result.push(...prerequisites);
+        continue;
+      }
+    }
     const args = await validator.check(value);
     if (args !== undefined) {
       const message = await validator.message(value, args);

validators/array.test.ts

@@ -13,7 +13,7 @@ Deno.test("isArray (match)", async () => {
     ["foo"],
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isArray), []);
+    assertEquals(await validate(value, isArray()), []);
   }
 });
 
@@ -33,6 +33,6 @@ Deno.test("isArray (no match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isArray), []);
+    assertNotEquals(await validate(value, isArray()), []);
   }
 });

validators/array.ts

@@ -1,14 +1,16 @@
 import { Validator, Args } from "../mod.ts";
 
-export const isArray: Validator = {
-  type: "isArray",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (!Array.isArray(value)) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be an array.`;
-  },
-};
+export function isArray(): Validator {
+  return {
+    type: "isArray",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (!Array.isArray(value)) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be an array.`;
+    },
+  };
+}

validators/boolean.test.ts

@@ -13,7 +13,7 @@ Deno.test("isBoolean (match)", async () => {
     false,
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isBoolean), []);
+    assertEquals(await validate(value, isBoolean()), []);
   }
 });
 
@@ -31,6 +31,6 @@ Deno.test("isBoolean (no match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isBoolean), []);
+    assertNotEquals(await validate(value, isBoolean()), []);
   }
 });

validators/boolean.ts

@@ -1,14 +1,16 @@
 import { Validator, Args } from "../mod.ts";
 
-export const isBoolean: Validator = {
-  type: "isBoolean",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (value !== true && value !== false) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be a boolean.`;
-  },
-};
+export function isBoolean(): Validator {
+  return {
+    type: "isBoolean",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (value !== true && value !== false) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be a boolean.`;
+    },
+  };
+}

validators/empty.test.ts

@@ -22,7 +22,7 @@ Deno.test("isRequired (match)", async () => {
     Symbol("foo"),
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isRequired), []);
+    assertEquals(await validate(value, isRequired()), []);
   }
 });
 
@@ -32,7 +32,7 @@ Deno.test("isRequired (no match)", async () => {
     null,
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isRequired), []);
+    assertNotEquals(await validate(value, isRequired()), []);
   }
 });
 
@@ -54,7 +54,7 @@ Deno.test("isDefined (match)", async () => {
     Symbol("foo"),
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isDefined), []);
+    assertEquals(await validate(value, isDefined()), []);
   }
 });
 
@@ -63,7 +63,7 @@ Deno.test("isDefined (no match)", async () => {
     undefined,
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isDefined), []);
+    assertNotEquals(await validate(value, isDefined()), []);
   }
 });
 
@@ -80,7 +80,7 @@ Deno.test("isNotEmpty (match)", async () => {
     Symbol("foo"),
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isNotEmpty), []);
+    assertEquals(await validate(value, isNotEmpty()), []);
   }
 });
 
@@ -94,6 +94,6 @@ Deno.test("isNotEmpty (no match)", async () => {
     [],
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isNotEmpty), []);
+    assertNotEquals(await validate(value, isNotEmpty()), []);
   }
 });

validators/empty.ts

@@ -8,63 +8,71 @@ import {
   isBoolean,
 } from "../mod.ts";
 
-export const isRequired: Validator = {
-  type: "isRequired",
-  check: (value: any) => {
-    if (value === null || value === undefined) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value is required.`;
-  },
-};
-
-export const isDefined: Validator = {
-  type: "isDefined",
-  check: (value: any) => {
-    if (value === undefined) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be defined.`;
-  },
-};
-
-export const isNotEmpty: Validator = {
-  type: "isNotEmpty",
-  check: async (value: any) => {
-    if (value === null || value === undefined) {
-      return {};
-    }
-    if ((await isString.check(value)) === undefined) {
-      if (/^\s*$/.test(value)) {
+export function isRequired(): Validator {
+  return {
+    type: "isRequired",
+    check: (value: any) => {
+      if (value === null || value === undefined) {
         return {};
       }
-      return;
-    }
-    if ((await isNumber.check(value)) === undefined || Number.isNaN(value)) {
-      return;
-    }
-    if (await isSymbol.check(value) === undefined) {
-      return;
-    }
-    if (await isBoolean.check(value) === undefined) {
-      return;
-    }
-    if ((await isArray.check(value)) === undefined) {
-      if (value.length > 0) {
+    },
+    message: (value: any, args?: Args) => {
+      return `This value is required.`;
+    },
+  };
+}
+
+export function isDefined(): Validator {
+  return {
+    type: "isDefined",
+    check: (value: any) => {
+      if (value === undefined) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be defined.`;
+    },
+  };
+}
+
+export function isNotEmpty(): Validator {
+  return {
+    type: "isNotEmpty",
+    check: async (value: any) => {
+      if (value === null || value === undefined) {
+        return {};
+      }
+      if ((await isString().check(value)) === undefined) {
+        if (/^\s*$/.test(value)) {
+          return {};
+        }
+        return;
+      }
+      if (
+        (await isNumber().check(value)) === undefined || Number.isNaN(value)
+      ) {
+        return;
+      }
+      if (await isSymbol().check(value) === undefined) {
+        return;
+      }
+      if (await isBoolean().check(value) === undefined) {
+        return;
+      }
+      if ((await isArray().check(value)) === undefined) {
+        if (value.length > 0) {
+          return;
+        }
+        return {};
+      }
+      for (const key in value) {
         return;
       }
       return {};
-    }
-    for (const key in value) {
-      return;
-    }
-    return {};
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be non-empty.`;
-  },
-};
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be non-empty.`;
+    },
+  };
+}

validators/logic.test.ts

@@ -7,8 +7,8 @@ import {
 
 Deno.test("or (match)", async () => {
   const values: [any, Validator[]][] = [
-    ["", [isString, isInteger]],
-    [1, [isString, isInteger]],
+    ["", [isString(), isInteger()]],
+    [1, [isString(), isInteger()]],
   ];
   for (const [value, validators] of values) {
     assertEquals(await validate(value, or(...validators)), []);
@@ -17,9 +17,9 @@ Deno.test("or (match)", async () => {
 
 Deno.test("or (no match)", async () => {
   const values: [any, Validator[]][] = [
-    [true, [isString, isInteger]],
-    [3.1415, [isString, isInteger]],
-    [1, [isString]],
+    [true, [isString(), isInteger()]],
+    [3.1415, [isString(), isInteger()]],
+    [1, [isString()]],
   ];
   for (const [value, validators] of values) {
     assertNotEquals(await validate(value, or(...validators)), []);

validators/number.test.ts

@@ -17,7 +17,7 @@ Deno.test("isNumber (match)", async () => {
     Math.PI,
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isNumber), []);
+    assertEquals(await validate(value, isNumber()), []);
   }
 });
 
@@ -33,7 +33,7 @@ Deno.test("isNumber (no match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isNumber), []);
+    assertNotEquals(await validate(value, isNumber()), []);
   }
 });
 
@@ -47,7 +47,7 @@ Deno.test("isInteger (match)", async () => {
     -1,
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isInteger), []);
+    assertEquals(await validate(value, isInteger()), []);
   }
 });
 
@@ -64,6 +64,6 @@ Deno.test("isInteger (no match)", async () => {
     0.1,
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isInteger), []);
+    assertNotEquals(await validate(value, isInteger()), []);
   }
 });

validators/number.ts

@@ -1,27 +1,31 @@
 import { Validator, Args } from "../mod.ts";
 
-export const isNumber: Validator = {
-  type: "isNumber",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (!Number.isFinite(value)) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be a number.`;
-  },
-};
+export function isNumber(): Validator {
+  return {
+    type: "isNumber",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (!Number.isFinite(value)) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be a number.`;
+    },
+  };
+}
 
-export const isInteger: Validator = {
-  type: "isInteger",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (!Number.isInteger(value)) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be an integer.`;
-  },
-};
+export function isInteger(): Validator {
+  return {
+    type: "isInteger",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (!Number.isInteger(value)) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be an integer.`;
+    },
+  };
+}

validators/string.test.ts

@@ -1,4 +1,4 @@
-import { isString } from "./string.ts";
+import { isString, isURL } from "./string.ts";
 import { validate } from "../mod.ts";
 import {
   assertEquals,
@@ -15,7 +15,7 @@ Deno.test("isString (match)", async () => {
     new String("bar"),
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isString), []);
+    assertEquals(await validate(value, isString()), []);
   }
 });
 
@@ -31,6 +31,24 @@ Deno.test("isString (no match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isString), []);
+    assertNotEquals(await validate(value, isString()), []);
+  }
+});
+
+Deno.test("isURL (match)", async () => {
+  const values = [
+    "http://google.com",
+  ];
+  for (const value of values) {
+    assertEquals(await validate(value, isURL()), []);
+  }
+});
+
+Deno.test("isURL (no match)", async () => {
+  const values = [
+    "invalid",
+  ];
+  for (const value of values) {
+    assertNotEquals(await validate(value, isURL()), []);
   }
 });

validators/string.ts

@@ -1,14 +1,32 @@
 import { Validator, Args } from "../mod.ts";
 
-export const isString: Validator = {
-  type: "isString",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (typeof value !== "string" && !(value instanceof String)) {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be a string.`;
-  },
-};
+export function isString(): Validator {
+  return {
+    type: "isString",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (typeof value !== "string" && !(value instanceof String)) {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be a string.`;
+    },
+  };
+}
+
+export function isURL(): Validator {
+  return {
+    type: "isURL",
+    extends: [isString()],
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (value !== "http://google.com") {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value is not a valid URL.`;
+    },
+  };
+}

validators/symbol.test.ts

@@ -12,7 +12,7 @@ Deno.test("isSymbol (match)", async () => {
     Symbol(),
   ];
   for (const value of values) {
-    assertEquals(await validate(value, isSymbol), []);
+    assertEquals(await validate(value, isSymbol()), []);
   }
 });
 
@@ -31,6 +31,6 @@ Deno.test("isSymbol (no match)", async () => {
     new Object(),
   ];
   for (const value of values) {
-    assertNotEquals(await validate(value, isSymbol), []);
+    assertNotEquals(await validate(value, isSymbol()), []);
   }
 });

validators/symbol.ts

@@ -1,14 +1,16 @@
 import { Validator, Args } from "../mod.ts";
 
-export const isSymbol: Validator = {
-  type: "isSymbol",
-  check: (value: any) => {
-    if (value === null || value === undefined) return;
-    if (typeof value !== "symbol") {
-      return {};
-    }
-  },
-  message: (value: any, args?: Args) => {
-    return `This value has to be a symbol.`;
-  },
-};
+export function isSymbol(): Validator {
+  return {
+    type: "isSymbol",
+    check: (value: any) => {
+      if (value === null || value === undefined) return;
+      if (typeof value !== "symbol") {
+        return {};
+      }
+    },
+    message: (value: any, args?: Args) => {
+      return `This value has to be a symbol.`;
+    },
+  };
+}