mingo
Version:
MongoDB query language for in-memory objects
239 lines (238 loc) • 7.05 kB
JavaScript
import {
assert,
has,
isArray,
isNil,
isObject,
isOperator,
isString,
resolve
} from "../util";
var ProcessingMode = /* @__PURE__ */ ((ProcessingMode2) => {
ProcessingMode2[ProcessingMode2["CLONE_OFF"] = 0] = "CLONE_OFF";
ProcessingMode2[ProcessingMode2["CLONE_INPUT"] = 1] = "CLONE_INPUT";
ProcessingMode2[ProcessingMode2["CLONE_OUTPUT"] = 2] = "CLONE_OUTPUT";
ProcessingMode2[ProcessingMode2["CLONE_ALL"] = 3] = "CLONE_ALL";
return ProcessingMode2;
})(ProcessingMode || {});
class ComputeOptions {
constructor(options, locals) {
this.options = options;
this.#locals = locals ? { ...locals } : {};
}
#locals;
/**
* Initializes a new instance of the `ComputeOptions` class with the provided options.
*
* @param options - A partial set of options to configure the `ComputeOptions` instance.
* If an instance of `ComputeOptions` is provided, its internal options and locals are used.
* @returns A new `ComputeOptions` instance configured with the provided options and root.
*/
static init(options) {
return options instanceof ComputeOptions ? new ComputeOptions(options.options, options.#locals) : new ComputeOptions({
idKey: "_id",
scriptEnabled: true,
useStrictMode: true,
processingMode: 0 /* CLONE_OFF */,
...options,
context: options?.context ? Context.from(options?.context) : Context.init()
});
}
update(locals) {
Object.assign(this.#locals, locals, {
// DO NOT override timestamp
timestamp: this.#locals.timestamp,
// merge variables.
variables: { ...this.#locals?.variables, ...locals?.variables }
});
return this;
}
get local() {
return this.#locals;
}
get now() {
if (!this.#locals?.timestamp)
Object.assign(this.#locals, { timestamp: Date.now() });
return new Date(this.#locals.timestamp);
}
get idKey() {
return this.options.idKey;
}
get collation() {
return this.options?.collation;
}
get processingMode() {
return this.options?.processingMode;
}
get useStrictMode() {
return this.options?.useStrictMode;
}
get scriptEnabled() {
return this.options?.scriptEnabled;
}
get collectionResolver() {
return this.options?.collectionResolver;
}
get jsonSchemaValidator() {
return this.options?.jsonSchemaValidator;
}
get variables() {
return this.options?.variables;
}
get context() {
return this.options?.context;
}
}
var OpType = /* @__PURE__ */ ((OpType2) => {
OpType2["ACCUMULATOR"] = "accumulator";
OpType2["EXPRESSION"] = "expression";
OpType2["PIPELINE"] = "pipeline";
OpType2["PROJECTION"] = "projection";
OpType2["QUERY"] = "query";
OpType2["WINDOW"] = "window";
return OpType2;
})(OpType || {});
class Context {
#operators = new Map(
Object.values(OpType).map((k) => [k, {}])
);
constructor() {
}
static init(ops = {}) {
const ctx = new Context();
for (const [type, operators] of Object.entries(ops)) {
if (ctx.#operators.has(type) && operators) {
ctx.addOps(type, operators);
}
}
return ctx;
}
static from(ctx) {
return Context.init(ctx && Object.fromEntries(ctx.#operators) || {});
}
static merge(first, second) {
const ctx = Context.from(first);
for (const type of Object.values(OpType)) {
ctx.addOps(type, second.#operators.get(type));
}
return ctx;
}
addOps(type, operators) {
this.#operators.set(
type,
Object.assign({}, operators, this.#operators.get(type))
);
return this;
}
getOperator(type, name) {
return this.#operators.get(type)[name] ?? null;
}
addAccumulatorOps(ops) {
return this.addOps("accumulator" /* ACCUMULATOR */, ops);
}
addExpressionOps(ops) {
return this.addOps("expression" /* EXPRESSION */, ops);
}
addQueryOps(ops) {
return this.addOps("query" /* QUERY */, ops);
}
addPipelineOps(ops) {
return this.addOps("pipeline" /* PIPELINE */, ops);
}
addProjectionOps(ops) {
return this.addOps("projection" /* PROJECTION */, ops);
}
addWindowOps(ops) {
return this.addOps("window" /* WINDOW */, ops);
}
}
function computeValue(obj, expr, operator, options) {
const copts = !(options instanceof ComputeOptions) || isNil(options.local.root) ? ComputeOptions.init(options).update({ root: obj }) : options;
return isOperator(operator) ? computeOperator(obj, expr, operator, copts) : computeExpression(obj, expr, copts);
}
const SYSTEM_VARS = ["$$ROOT", "$$CURRENT", "$$REMOVE", "$$NOW"];
function computeExpression(obj, expr, options) {
if (isString(expr) && expr.length > 0 && expr[0] === "$") {
if (expr === "$$KEEP" || expr === "$$PRUNE" || expr === "$$DESCEND")
return expr;
let ctx = options.local.root;
const arr = expr.split(".");
if (SYSTEM_VARS.includes(arr[0])) {
switch (arr[0]) {
case "$$ROOT":
break;
case "$$CURRENT":
ctx = obj;
break;
case "$$REMOVE":
ctx = void 0;
break;
case "$$NOW":
ctx = new Date(options.now);
break;
}
expr = expr.slice(arr[0].length + 1);
} else if (arr[0].slice(0, 2) === "$$") {
ctx = Object.assign(
{},
// global vars
options.variables,
// current item is added before local variables because the binding may be changed.
{ this: obj },
// local vars
options?.local?.variables
);
const name = arr[0].slice(2);
assert(has(ctx, name), `Use of undefined variable: ${name}`);
expr = expr.slice(2);
} else {
expr = expr.slice(1);
}
return expr === "" ? ctx : resolve(ctx, expr);
}
if (isArray(expr)) {
return expr.map((item) => computeExpression(obj, item, options));
}
if (isObject(expr)) {
const result = {};
const elems = Object.entries(expr);
for (const [key, val] of elems) {
if (isOperator(key)) {
assert(
elems.length === 1,
`Expression must contain a single operator. got [${Object.keys(expr).join(",")}]`
);
return computeOperator(obj, val, key, options);
}
result[key] = computeExpression(obj, val, options);
}
return result;
}
return expr;
}
function computeOperator(obj, expr, operator, options) {
const context = options.context;
const callExpression = context.getOperator(
"expression" /* EXPRESSION */,
operator
);
if (callExpression) return callExpression(obj, expr, options);
const callAccumulator = context.getOperator(
"accumulator" /* ACCUMULATOR */,
operator
);
assert(!!callAccumulator, `accumulator '${operator}' is not registered.`);
if (!isArray(obj)) {
obj = computeExpression(obj, expr, options);
expr = null;
}
assert(isArray(obj), `arguments must resolve to array for ${operator}.`);
return callAccumulator(obj, expr, options);
}
export {
ComputeOptions,
Context,
OpType,
ProcessingMode,
computeValue
};