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import { parseNotation, type MutationOperation, type PathPart } from "../builder/mutator";
export type { MutationOperation, PathPart };
export type PathSegment = PathPart;
const OPERATION_SUFFIX = /:((?:append|prepend|after|before|remove))$/;
export interface ParsedMutationKey {
rootKey: string;
pathSegments: PathSegment[];
allSegments: PathSegment[];
operation: MutationOperation;
}
/**
* Returns true if the key looks like mutation notation (contains path or operation).
*/
export function isMutationKey(key: string): boolean {
const k = key.trim();
return k.includes(".") || k.includes("[") || OPERATION_SUFFIX.test(k);
}
/**
* Parse a full variable key (e.g. "config.width", "items[1].name", "tags:append")
* into root variable name, path segments within the variable, and operation.
* Uses the shared parseNotation from the mutator.
*/
export function parseMutationKey(key: string): ParsedMutationKey | null {
const rest = key.trim();
if (!rest) return null;
const { segments, operation } = parseNotation(rest);
const rootKey = segments.length > 0 && "key" in segments[0] ? segments[0].key : "";
const first = segments[0];
const firstPathPart: PathSegment[] =
first && ("index" in first || "selector" in first)
? [
"index" in first
? { key: "", index: first.index }
: { key: "", selector: first.selector! },
]
: [];
const pathWithinVariable = firstPathPart.concat(segments.slice(1));
return { rootKey, pathSegments: pathWithinVariable, allSegments: segments, operation };
}
/**
* Resolve a schema reference (schema.schema -> schemasByKey[name]).
* Follows one level of reference; the resolved schema may itself have oneOf or another ref.
*/
function resolveSchemaRef(
schema: Schema | null,
schemasByKey: Record<string, Schema> | undefined,
): Schema | null {
if (!schema || typeof schema !== "object") return null;
if (schema.schema && schemasByKey?.[schema.schema]) {
return resolveSchemaRef(schemasByKey[schema.schema], schemasByKey);
}
return schema;
}
/**
* Return true if the schema is a oneOf (multiple possible shapes); path resolution cannot descend through oneOf.
*/
function isOneOfSchema(schema: Schema): boolean {
return Array.isArray(schema.oneOf) && schema.oneOf.length > 0;
}
/**
* Resolve the schema at a path within a variable schema.
* pathSegments are the path *within* the variable (e.g. for variable "config", path [ {key:"width"} ];
* for variable "items", path [ {index:0}, {key:"name"} ]).
* Returns the schema at that path, or null if the path is invalid.
* Does not descend through oneOf (path through oneOf is considered invalid for mutation targets).
*/
export function resolveSchemaAtPath(
variableSchema: Schema | null,
pathSegments: PathSegment[],
schemasByKey?: Record<string, Schema>,
): Schema | null {
let current: Schema | null = resolveSchemaRef(variableSchema, schemasByKey);
if (!current) return null;
for (const seg of pathSegments) {
if (isOneOfSchema(current)) return null;
if (seg.key) {
if (current.type !== "object") return null;
const props = current.properties;
const additional = current.additionalProperties;
const next = props && typeof props === "object" ? props[seg.key] : undefined;
if (next === undefined) {
if (!additional || typeof additional !== "object") return null;
current = resolveSchemaRef(additional, schemasByKey);
Iif (!current) return null;
continue;
}
current = resolveSchemaRef(next, schemasByKey);
Iif (!current) return null;
}
if ("index" in seg || "selector" in seg) {
if (current.type !== "array") return null;
const itemSchema = current.items;
Iif (!itemSchema || typeof itemSchema !== "object") return null;
current = resolveSchemaRef(itemSchema, schemasByKey);
Iif (!current) return null;
}
}
return current;
}
/**
* Return the schema of the container at the end of path (object or array) and the last segment.
* Used to check if we can do append/prepend (must be array) or remove (object key or array element).
* Does not descend through oneOf.
*/
function getContainerSchemaAtPath(
variableSchema: Schema | null,
pathSegments: PathSegment[],
schemasByKey?: Record<string, Schema>,
): { containerSchema: Schema; lastSegment: PathSegment; parentSchema: Schema } | null {
if (pathSegments.length === 0) {
const resolved = variableSchema ? resolveSchemaRef(variableSchema, schemasByKey) : null;
return resolved
? { containerSchema: resolved, lastSegment: { key: "" }, parentSchema: resolved }
: null;
}
let current: Schema | null = resolveSchemaRef(variableSchema, schemasByKey);
Iif (!current) return null;
const pathWithoutLast = pathSegments.slice(0, -1);
const lastSegment = pathSegments[pathSegments.length - 1];
for (const seg of pathWithoutLast) {
Iif (isOneOfSchema(current)) return null;
if (seg.key) {
Iif (current.type !== "object") return null;
const props = current.properties;
const additional = current.additionalProperties;
const next = props && typeof props === "object" ? props[seg.key] : undefined;
if (next === undefined) {
if (!additional || typeof additional !== "object") return null;
current = resolveSchemaRef(additional, schemasByKey);
Iif (!current) return null;
continue;
}
current = resolveSchemaRef(next, schemasByKey);
}
if ("index" in seg || "selector" in seg) {
Iif (current?.type !== "array") return null;
const itemSchema = current.items;
Iif (!itemSchema || typeof itemSchema !== "object") return null;
current = resolveSchemaRef(itemSchema, schemasByKey);
}
Iif (!current) return null;
}
Iif (!current) return null;
const parentSchema = current;
if ("index" in lastSegment || "selector" in lastSegment) {
let arraySchema: Schema | null = parentSchema;
if (lastSegment.key) {
Iif (arraySchema.type !== "object") return null;
const props = arraySchema.properties;
const additional = arraySchema.additionalProperties;
const next = props && typeof props === "object" ? props[lastSegment.key] : undefined;
if (next === undefined) {
if (!additional || typeof additional !== "object") return null;
arraySchema = resolveSchemaRef(additional, schemasByKey);
} else {
arraySchema = resolveSchemaRef(next, schemasByKey);
}
Iif (!arraySchema) return null;
}
const normalizedLastSegment =
"index" in lastSegment
? ({ key: "", index: lastSegment.index } as PathSegment)
: ({ key: "", selector: lastSegment.selector } as PathSegment);
return {
containerSchema: arraySchema,
lastSegment: normalizedLastSegment,
parentSchema: arraySchema,
};
}
const propSchema =
parentSchema.properties?.[lastSegment.key] ?? parentSchema.additionalProperties;
const resolvedProp =
propSchema && typeof propSchema === "object"
? resolveSchemaRef(propSchema, schemasByKey)
: null;
return resolvedProp ? { containerSchema: resolvedProp, lastSegment, parentSchema } : null;
}
export interface MutationValidationResult {
valid: boolean;
rootKey: string;
pathSegments: PathSegment[];
operation: MutationOperation;
valueSchema: Schema | null;
error?: string;
}
/**
* Validate mutation key against variable schema: root exists, path valid, operation allowed.
* Returns valueSchema to validate the value against (for set: schema at path; for append/prepend/after/before: item schema).
* Uses Schema from @featurevisor/types; validates required (no :remove on required props) and does not allow path through oneOf.
*/
export function validateMutationKey(
key: string,
variableSchemaByKey: Record<string, Schema>,
schemasByKey?: Record<string, Schema>,
): MutationValidationResult {
const parsed = parseMutationKey(key);
if (!parsed) {
return {
valid: false,
rootKey: "",
pathSegments: [],
operation: "set",
valueSchema: null,
error: `Invalid mutation notation: "${key}"`,
};
}
const { rootKey, pathSegments, operation } = parsed;
if (!rootKey) {
return {
valid: false,
rootKey: "",
pathSegments: [],
operation,
valueSchema: null,
error: `Mutation key must start with a variable name: "${key}"`,
};
}
const variableSchema = variableSchemaByKey[rootKey];
if (!variableSchema) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Variable "${rootKey}" is not defined in \`variablesSchema\`.`,
};
}
const resolvedRoot = resolveSchemaRef(variableSchema, schemasByKey);
Iif (!resolvedRoot) {
const refName =
variableSchema && typeof variableSchema === "object" && "schema" in variableSchema
? (variableSchema as { schema?: string }).schema
: undefined;
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error:
refName != null
? `Schema "${refName}" could not be loaded for variable "${rootKey}".`
: `Could not resolve schema for variable "${rootKey}".`,
};
}
if (pathSegments.length > 0 && isOneOfSchema(resolvedRoot)) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Cannot mutate path into variable "${rootKey}" (root schema is \`oneOf\`; path resolution not defined).`,
};
}
const container = getContainerSchemaAtPath(variableSchema, pathSegments, schemasByKey);
const valueSchemaAtPath = resolveSchemaAtPath(variableSchema, pathSegments, schemasByKey);
switch (operation) {
case "append":
case "prepend": {
if (!container) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Path "${key}" is invalid for variable "${rootKey}" (path does not exist in schema).`,
};
}
const arrResolved = container.containerSchema;
if (!arrResolved || arrResolved.type !== "array") {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Operation ":${operation}" is only allowed on array variables or object properties of type array; path "${key}" does not point to an array.`,
};
}
Iif (isOneOfSchema(arrResolved)) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Operation ":${operation}" is not allowed when array \`items\` is \`oneOf\` (path "${key}").`,
};
}
const itemSchema =
arrResolved.items && typeof arrResolved.items === "object"
? resolveSchemaRef(arrResolved.items, schemasByKey)
: null;
return {
valid: true,
rootKey,
pathSegments,
operation,
valueSchema: itemSchema,
};
}
case "after":
case "before":
case "remove": {
if (!container) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Path "${key}" is invalid for variable "${rootKey}" (path does not exist in schema).`,
};
}
const last = container.lastSegment;
if ("index" in last || "selector" in last) {
Iif (container.parentSchema.type !== "array") {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Operation ":${operation}" with array index/selector is only allowed on arrays; path "${key}" does not point to an array element.`,
};
}
if (operation === "after" || operation === "before") {
const parentItems = container.parentSchema.items;
if (parentItems && typeof parentItems === "object" && isOneOfSchema(parentItems)) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Operation ":${operation}" is not allowed when array \`items\` is \`oneOf\` (path "${key}").`,
};
}
const itemSchema =
parentItems && typeof parentItems === "object"
? resolveSchemaRef(parentItems, schemasByKey)
: null;
return { valid: true, rootKey, pathSegments, operation, valueSchema: itemSchema };
}
return { valid: true, rootKey, pathSegments, operation, valueSchema: null };
}
Iif (container.parentSchema.type !== "object") {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Operation ":${operation}" on a property is only allowed on objects; path "${key}" does not point to an object property.`,
};
}
const requiredKeys = container.parentSchema.required;
if (
operation === "remove" &&
Array.isArray(requiredKeys) &&
requiredKeys.includes(last.key)
) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Cannot remove required property "${last.key}" from variable "${rootKey}" (listed in schema \`required\`).`,
};
}
return { valid: true, rootKey, pathSegments, operation, valueSchema: null };
}
case "set": {
if (valueSchemaAtPath === null && pathSegments.length > 0) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Path "${key}" is invalid for variable "${rootKey}" (path does not exist in schema).`,
};
}
if (valueSchemaAtPath && isOneOfSchema(valueSchemaAtPath)) {
return {
valid: false,
rootKey,
pathSegments,
operation,
valueSchema: null,
error: `Cannot set value at path "${key}" (target schema is \`oneOf\`; mutation target must be a single schema).`,
};
}
return {
valid: true,
rootKey,
pathSegments,
operation,
valueSchema: valueSchemaAtPath,
};
}
default:
return {
valid: true,
rootKey,
pathSegments,
operation,
valueSchema: valueSchemaAtPath,
};
}
}
/**
* Parse a path-map key (relative to a variable) into path segments for resolveSchemaAtPath.
* e.g. "display.fontSize" -> [{key:"display"},{key:"fontSize"}], "[0].name" -> [{key:"",index:0},{key:"name"}].
*/
export function parsePathMapKey(relativePath: string): PathSegment[] | null {
const parsed = parseMutationKey(relativePath);
if (!parsed) return null;
return parsed.allSegments.length > 0 ? parsed.allSegments : null;
}
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