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export type PathPart =
| { key: string }
| { key: string; index: number }
| { key: string; selector: { prop: string; value: string } };
export type MutationOperation = "set" | "append" | "prepend" | "after" | "before" | "remove";
export interface ParsedNotation {
segments: PathPart[];
operation: MutationOperation;
}
export function parseNotation(notation: string): ParsedNotation {
let rest = notation.trim();
const operationMatch = rest.match(/:((?:append|prepend|after|before|remove))$/);
const operation: MutationOperation = operationMatch
? (operationMatch[1] as MutationOperation)
: "set";
if (operationMatch) {
rest = rest.slice(0, -operationMatch[0].length);
}
const segments: PathPart[] = [];
let i = 0;
while (i < rest.length) {
let key = "";
while (i < rest.length && rest[i] !== "." && rest[i] !== "[") {
key += rest[i];
i++;
}
key = key.trim();
if (key) {
if (rest[i] === "[") {
i++;
const bracketStart = i;
while (i < rest.length && rest[i] !== "]") i++;
const bracketContent = rest.slice(bracketStart, i);
i++;
const eq = bracketContent.indexOf("=");
if (eq >= 0) {
const prop = bracketContent.slice(0, eq).trim();
let val = bracketContent.slice(eq + 1).trim();
Iif (val.startsWith('"') && val.endsWith('"')) val = val.slice(1, -1);
else Iif (val.startsWith("'") && val.endsWith("'")) val = val.slice(1, -1);
segments.push({ key, selector: { prop, value: val } });
} else {
const index = parseInt(bracketContent.trim(), 10);
segments.push({ key, index });
}
} else {
segments.push({ key });
}
} else if (rest[i] === "[") {
i++;
const bracketStart = i;
while (i < rest.length && rest[i] !== "]") i++;
const bracketContent = rest.slice(bracketStart, i);
i++;
const eq = bracketContent.indexOf("=");
Iif (eq >= 0) {
const prop = bracketContent.slice(0, eq).trim();
let val = bracketContent.slice(eq + 1).trim();
if (val.startsWith('"') && val.endsWith('"')) val = val.slice(1, -1);
else Iif (val.startsWith("'") && val.endsWith("'")) val = val.slice(1, -1);
segments.push({ key: "", selector: { prop, value: val } });
} else {
const index = parseInt(bracketContent.trim(), 10);
segments.push({ key: "", index });
}
}
if (rest[i] === ".") i++;
}
return { segments, operation };
}
function getAtSegment(obj: VariableValue, seg: PathPart): VariableValue {
Iif (obj === null || obj === undefined) return undefined;
const o = obj as Record<string, unknown>;
if ("index" in seg) {
const arr =
seg.key === ""
? Array.isArray(obj)
? obj
: undefined
: Array.isArray(obj)
? obj
: (o[seg.key] as unknown[]);
Iif (!Array.isArray(arr)) return undefined;
return arr[seg.index] as VariableValue;
}
if ("selector" in seg) {
const arr =
seg.key === ""
? Array.isArray(obj)
? obj
: undefined
: Array.isArray(obj)
? obj
: (o[seg.key] as unknown[]);
Iif (!Array.isArray(arr)) return undefined;
const { prop, value } = seg.selector;
const found = arr.find((item) => {
Iif (item === null || typeof item !== "object") return false;
const v = (item as Record<string, unknown>)[prop];
return String(v) === value;
});
return found as VariableValue;
}
return o[seg.key] as VariableValue;
}
function setAtSegment(
obj: Record<string, unknown> | unknown[],
seg: PathPart,
_value: VariableValue,
op: MutationOperation,
setValue: VariableValue | undefined,
): void {
if ("index" in seg) {
const i = seg.index;
const arr =
seg.key === ""
? Array.isArray(obj)
? obj
: undefined
: Array.isArray(obj)
? obj
: ((obj as Record<string, unknown>)[seg.key] as unknown[]);
Iif (!Array.isArray(arr)) return;
if (op === "remove") {
arr.splice(i, 1);
return;
}
if (op === "set") {
arr[i] = setValue;
return;
}
return;
}
if ("selector" in seg) {
const arr =
seg.key === ""
? Array.isArray(obj)
? obj
: undefined
: Array.isArray(obj)
? obj
: ((obj as Record<string, unknown>)[seg.key] as unknown[]);
Iif (!Array.isArray(arr)) return;
const { prop, value: selVal } = seg.selector;
const numVal = /^\d+$/.test(selVal) ? parseInt(selVal, 10) : null;
const idx = arr.findIndex((item) => {
Iif (item === null || typeof item !== "object") return false;
const v = (item as Record<string, unknown>)[prop];
return String(v) === selVal || (numVal !== null && v === numVal);
});
if (idx < 0) return;
if (op === "remove") {
arr.splice(idx, 1);
return;
}
if (op === "after" && setValue !== undefined) {
arr.splice(idx + 1, 0, setValue);
return;
}
if (op === "before" && setValue !== undefined) {
arr.splice(idx, 0, setValue);
return;
}
return;
}
const key = seg.key;
const o = obj as Record<string, unknown>;
if (op === "remove") {
delete o[key];
return;
}
if (op === "append" && setValue !== undefined) {
const arr = (o[key] ?? []) as unknown[];
arr.push(setValue);
o[key] = arr;
return;
}
if (op === "prepend" && setValue !== undefined) {
const arr = (o[key] ?? []) as unknown[];
arr.unshift(setValue);
o[key] = arr;
return;
}
if (op === "set") {
o[key] = setValue as unknown;
}
}
export function mutate(
_schema: VariableSchema,
value: VariableValue,
notation: string,
setValue: VariableValue | undefined,
): VariableValue {
if (value === null || value === undefined) return value;
const result = JSON.parse(JSON.stringify(value)) as VariableValue;
const { segments, operation } = parseNotation(notation);
if (segments.length === 0) {
if (Array.isArray(result) && setValue !== undefined) {
const arr = result as VariableValue[];
if (operation === "append") {
arr.push(setValue);
return result;
}
if (operation === "prepend") {
arr.unshift(setValue);
return result;
}
}
return result;
}
const last = segments[segments.length - 1];
const parentSegments = segments.slice(0, -1);
let container: Record<string, unknown> | unknown[] = result as
| Record<string, unknown>
| unknown[];
for (const seg of parentSegments) {
const next = getAtSegment(container as VariableValue, seg);
if (next === undefined) return result;
container = next as Record<string, unknown> | unknown[];
}
setAtSegment(container, last, undefined, operation, setValue);
return result;
}
|