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// Copyright 2018-2026 the Deno authors. MIT license.
// This module is browser compatible.
import { bgGreen, bgRed, bold, gray, green, red, white } from "./styles.ts";
import type { DiffResult, DiffType } from "./types.ts";
/**
* Colors the output of assertion diffs.
*
* @param diffType Difference type, either added or removed.
* @param background If true, colors the background instead of the text.
*
* @returns A function that colors the input string.
*
* @example Usage
* ```ts
* import { createColor } from "@std/internal";
* import { assertEquals } from "@std/assert";
* import { bold, green, red, white } from "@std/fmt/colors";
*
* assertEquals(createColor("added")("foo"), green(bold("foo")));
* assertEquals(createColor("removed")("foo"), red(bold("foo")));
* assertEquals(createColor("common")("foo"), white("foo"));
* ```
*/
export function createColor(
diffType: DiffType,
/**
* TODO(@littledivy): Remove this when we can detect true color terminals. See
* https://github.com/denoland/std/issues/2575.
*/
background = false,
): (s: string) => string {
switch (diffType) {
case "added":
return (s) => background ? bgGreen(white(s)) : green(bold(s));
case "removed":
return (s) => background ? bgRed(white(s)) : red(bold(s));
case "truncation":
return gray;
default:
return white;
}
}
/**
* Prefixes `+` or `-` in diff output.
*
* @param diffType Difference type, either added or removed
*
* @returns A string representing the sign.
*
* @example Usage
* ```ts
* import { createSign } from "@std/internal";
* import { assertEquals } from "@std/assert";
*
* assertEquals(createSign("added"), "+ ");
* assertEquals(createSign("removed"), "- ");
* assertEquals(createSign("common"), " ");
* ```
*/
export function createSign(diffType: DiffType): string {
switch (diffType) {
case "added":
return "+ ";
case "removed":
return "- ";
default:
return " ";
}
}
/** Options for {@linkcode buildMessage}. */
export interface BuildMessageOptions {
/**
* Whether to output the diff as a single string.
* @default {false}
*/
stringDiff?: boolean;
}
/**
* Builds a message based on the provided diff result.
*
* @param diffResult The diff result array.
* @param options Optional parameters for customizing the message.
* @param truncateDiff Function to truncate the diff (default is no truncation).
*
* @returns An array of strings representing the built message.
*
* @example Usage
* ```ts no-assert
* import { diffStr, buildMessage } from "@std/internal";
*
* diffStr("Hello, world!", "Hello, world");
* // [
* // "",
* // "",
* // " [Diff] Actual / Expected",
* // "",
* // "",
* // "- Hello, world!",
* // "+ Hello, world",
* // "",
* // ]
* ```
*/
export function buildMessage(
diffResult: ReadonlyArray<DiffResult<string>>,
options: BuildMessageOptions = {},
truncateDiff?: (
diffResult: ReadonlyArray<DiffResult<string>>,
stringDiff: boolean,
contextLength?: number | null,
) => ReadonlyArray<DiffResult<string>>,
): string[] {
if (truncateDiff != null) {
diffResult = truncateDiff(diffResult, options.stringDiff ?? false);
}
const { stringDiff = false } = options;
const messages = [
"",
"",
` ${gray(bold("[Diff]"))} ${red(bold("Actual"))} / ${
green(bold("Expected"))
}`,
"",
"",
];
const diffMessages = diffResult.map((result) => {
const color = createColor(result.type);
const line = result.type === "added" || result.type === "removed"
? result.details?.map((detail) =>
detail.type !== "common"
? createColor(detail.type, true)(detail.value)
: detail.value
).join("") ?? result.value
: result.value;
return color(`${createSign(result.type)}${line}`);
});
messages.push(...(stringDiff ? [diffMessages.join("")] : diffMessages), "");
return messages;
}
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