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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { equal } from "./asserts.ts";
import { red, green, white, gray, bold } from "../colors/mod.ts";
import diff, { DiffType, DiffResult } from "./diff.ts";
import { format } from "./format.ts";
const CAN_NOT_DISPLAY = "[Cannot display]";
function createStr(v: unknown): string {
try {
return format(v);
} catch (e) {
return red(CAN_NOT_DISPLAY);
}
}
function createColor(diffType: DiffType): (s: string) => string {
switch (diffType) {
case DiffType.added:
return (s: string): string => green(bold(s));
case DiffType.removed:
return (s: string): string => red(bold(s));
default:
return white;
}
}
function createSign(diffType: DiffType): string {
switch (diffType) {
case DiffType.added:
return "+ ";
case DiffType.removed:
return "- ";
default:
return " ";
}
}
function buildMessage(diffResult: ReadonlyArray<DiffResult<string>>): string[] {
const messages: string[] = [];
messages.push("");
messages.push("");
messages.push(
` ${gray(bold("[Diff]"))} ${red(bold("Left"))} / ${green(bold("Right"))}`
);
messages.push("");
messages.push("");
diffResult.forEach(
(result: DiffResult<string>): void => {
const c = createColor(result.type);
messages.push(c(`${createSign(result.type)}${result.value}`));
}
);
messages.push("");
return messages;
}
export function assertEquals(
actual: unknown,
expected: unknown,
msg?: string
): void {
if (equal(actual, expected)) {
return;
}
let message = "";
const actualString = createStr(actual);
const expectedString = createStr(expected);
try {
const diffResult = diff(
actualString.split("\n"),
expectedString.split("\n")
);
message = buildMessage(diffResult).join("\n");
} catch (e) {
message = `\n${red(CAN_NOT_DISPLAY)} + \n\n`;
}
if (msg) {
message = msg;
}
throw new Error(message);
}
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