File size: 2,302 Bytes
fc93158 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | import { DIFF_INDICATORS, DIFF_LAYOUTS, DIFF_THEMES } from "./types.js";
import type { DiffViewerPayload } from "./types.js";
const OVERFLOW_VALUES = ["scroll", "wrap"] as const;
export function parseViewerPayloadJson(raw: string): DiffViewerPayload {
let parsed: unknown;
try {
parsed = JSON.parse(raw);
} catch {
throw new Error("Diff payload is not valid JSON.");
}
if (!isDiffViewerPayload(parsed)) {
throw new Error("Diff payload has invalid shape.");
}
return parsed;
}
function isDiffViewerPayload(value: unknown): value is DiffViewerPayload {
if (!isRecord(value)) {
return false;
}
if (typeof value.prerenderedHTML !== "string") {
return false;
}
if (!Array.isArray(value.langs) || !value.langs.every((lang) => typeof lang === "string")) {
return false;
}
if (!isViewerOptions(value.options)) {
return false;
}
const hasFileDiff = isRecord(value.fileDiff);
const hasBeforeAfterFiles = isRecord(value.oldFile) && isRecord(value.newFile);
if (!hasFileDiff && !hasBeforeAfterFiles) {
return false;
}
return true;
}
function isViewerOptions(value: unknown): boolean {
if (!isRecord(value)) {
return false;
}
if (!isRecord(value.theme)) {
return false;
}
if (value.theme.light !== "pierre-light" || value.theme.dark !== "pierre-dark") {
return false;
}
if (!includesValue(DIFF_LAYOUTS, value.diffStyle)) {
return false;
}
if (!includesValue(DIFF_INDICATORS, value.diffIndicators)) {
return false;
}
if (!includesValue(DIFF_THEMES, value.themeType)) {
return false;
}
if (!includesValue(OVERFLOW_VALUES, value.overflow)) {
return false;
}
if (typeof value.disableLineNumbers !== "boolean") {
return false;
}
if (typeof value.expandUnchanged !== "boolean") {
return false;
}
if (typeof value.backgroundEnabled !== "boolean") {
return false;
}
if (typeof value.unsafeCSS !== "string") {
return false;
}
return true;
}
function isRecord(value: unknown): value is Record<string, unknown> {
return typeof value === "object" && value !== null;
}
function includesValue<T extends readonly string[]>(values: T, value: unknown): value is T[number] {
return typeof value === "string" && values.includes(value as T[number]);
}
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