mirror of
https://github.com/denoland/std.git
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115 lines
2.9 KiB
TypeScript
115 lines
2.9 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { bgGreen, bgRed, bold, gray, green, red, white } from "./styles.ts";
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import type { DiffResult, DiffType } from "./types.ts";
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/**
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* Colors the output of assertion diffs.
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*
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* @param diffType Difference type, either added or removed.
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* @param background If true, colors the background instead of the text.
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*
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* @returns A function that colors the input string.
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*/
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function createColor(
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diffType: DiffType,
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background = false,
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): (s: string) => string {
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/**
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* TODO(@littledivy): Remove this when we can detect true color terminals. See
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* https://github.com/denoland/deno_std/issues/2575.
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*/
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background = false;
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switch (diffType) {
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case "added":
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return (s) => background ? bgGreen(white(s)) : green(bold(s));
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case "removed":
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return (s) => background ? bgRed(white(s)) : red(bold(s));
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default:
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return white;
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}
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}
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/**
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* Prefixes `+` or `-` in diff output.
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*
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* @param diffType Difference type, either added or removed
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*
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* @returns A string representing the sign.
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*/
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function createSign(diffType: DiffType): string {
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switch (diffType) {
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case "added":
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return "+ ";
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case "removed":
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return "- ";
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default:
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return " ";
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}
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}
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/** Options for {@linkcode buildMessage}. */
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export interface BuildMessageOptions {
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/**
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* Whether to output the diff as a single string.
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*
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* @default {false}
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*/
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stringDiff?: boolean;
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}
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/**
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* Builds a message based on the provided diff result.
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*
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* @param diffResult The diff result array.
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* @param options Optional parameters for customizing the message.
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*
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* @returns An array of strings representing the built message.
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*
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* @example Usage
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* ```ts
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* import { diffStr, buildMessage } from "@std/internal";
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*
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* const diffResult = diffStr("Hello, world!", "Hello, world");
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*
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* console.log(buildMessage(diffResult));
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* // [
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* // "",
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* // "",
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* // " [Diff] Actual / Expected",
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* // "",
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* // "",
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* // "- Hello, world!",
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* // "+ Hello, world",
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* // "",
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* // ]
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* ```
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*/
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export function buildMessage(
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diffResult: ReadonlyArray<DiffResult<string>>,
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options: BuildMessageOptions = {},
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): string[] {
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const { stringDiff = false } = options;
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const messages = [
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"",
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"",
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` ${gray(bold("[Diff]"))} ${red(bold("Actual"))} / ${
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green(bold("Expected"))
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}`,
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"",
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"",
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];
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const diffMessages = diffResult.map((result) => {
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const color = createColor(result.type);
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const line = result.details?.map((detail) =>
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detail.type !== "common"
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? createColor(detail.type, true)(detail.value)
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: detail.value
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).join("") ?? result.value;
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return color(`${createSign(result.type)}${line}`);
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});
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messages.push(...(stringDiff ? [diffMessages.join("")] : diffMessages), "");
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return messages;
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}
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