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import {Value} from './Value';
import type * as types from './types';
/**
* Function signature for JSONPath functions
*/
type JSONPathFunction = (args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval) => any;
export class JsonPathEval {
public static run = (path: string | types.JSONPath, data: unknown): Value[] => {
let ast: types.JSONPath;
if (typeof path === 'string') {
const parsed = JsonPathParser.parse(path);
Iif (!parsed.success || !parsed.path || parsed.error)
throw new Error(`Invalid JSONPath: ${parsed.error} [position = ${parsed.position}, path = ${path}]`);
ast = parsed.path;
} else East = path;
const evaluator = new JsonPathEval(ast, data);
return evaluator.eval();
};
/**
* Function registry for JSONPath functions
*/
protected readonly funcs = new Map<string, JSONPathFunction>([
['length', this.lengthFunction.bind(this)],
['count', this.countFunction.bind(this)],
['match', this.matchFunction.bind(this)],
['search', this.searchFunction.bind(this)],
['value', this.valueFunction.bind(this)],
]);
constructor(
public readonly path: types.JSONPath,
public readonly data: unknown,
) {}
eval(): Value[] {
let input: Value[] = [new Value(null, '$', this.data)];
let output: Value[] = [];
const segments = this.path.segments;
const length = segments.length;
for (let i = 0; i < length; i++) {
output = this.evalSegment(input, segments[i]);
input = output;
}
return output;
}
evalSegment(input: Value[], segment: types.PathSegment): Value[] {
const output: Value[] = [];
const selectors = segment.selectors;
const length = selectors.length;
for (let i = 0; i < length; i++) this.evalSelector(input, selectors[i], output);
return output;
}
evalSelector(inputs: Value[], selector: types.AnySelector, output: Value[] = []): Value[] {
switch (selector.type) {
case 'name': {
this.evalNamed(inputs, selector, output);
break;
}
case 'index': {
this.evalIndex(inputs, selector, output);
break;
}
case 'wildcard': {
this.evalWildcard(inputs, selector, output);
break;
}
case 'slice': {
this.evalSlice(inputs, selector, output);
break;
}
case 'filter': {
this.evalFilter(inputs, selector, output);
break;
}
case 'recursive-descent': {
this.evalRecursiveDescent(inputs, selector, output);
break;
}
}
return output;
}
protected evalNamed(inputs: Value[], selector: types.NamedSelector, output: Value[] = []): void {
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
const data = input.data;
if (data && typeof data === 'object' && !Array.isArray(data)) {
const key = selector.name;
// biome-ignore lint: object hasOwnProperty check is intentional, Object.hasOwn is too recent
if (data.hasOwnProperty(key)) output.push(new Value(input, key, (data as any)[key]));
}
}
}
protected evalIndex(inputs: Value[], selector: types.IndexSelector, output: Value[] = []): void {
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
const data = input.data;
if (!Array.isArray(data)) continue;
let index = selector.index;
// Handle negative indices
if (index < 0) {
index = data.length + index;
}
if (index < 0 || index >= data.length) continue;
const child = data[index];
Iif (child === undefined) continue;
output.push(new Value(input, index, child));
}
}
protected evalWildcard(inputs: Value[], selector: types.WildcardSelector, output: Value[] = []): void {
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
const data = input.data;
if (Array.isArray(data)) {
// For arrays, select all elements in order
for (let j = 0; j < data.length; j++) {
output.push(new Value(input, j, data[j]));
}
} else if (data && typeof data === 'object') {
// For objects, select all member values (order is not guaranteed per RFC 9535)
for (const key in data) {
// biome-ignore lint: object hasOwnProperty check is intentional, Object.hasOwn is too recent
if (data.hasOwnProperty(key)) {
output.push(new Value(input, key, (data as any)[key]));
}
}
}
// For primitive values, wildcard selects nothing
}
}
protected evalSlice(inputs: Value[], selector: types.SliceSelector, output: Value[] = []): void {
const step = selector.step !== undefined ? selector.step : 1;
// Handle step = 0 case (no elements selected per RFC 9535)
if (step === 0) {
return;
}
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
const data = input.data;
if (!Array.isArray(data)) continue;
const len = data.length;
// Determine default start and end based on step direction
let start: number, end: number;
if (step >= 0) {
start = selector.start !== undefined ? selector.start : 0;
end = selector.end !== undefined ? selector.end : len;
} else {
start = selector.start !== undefined ? selector.start : len - 1;
end = selector.end !== undefined ? selector.end : -len - 1;
}
// Normalize start and end indices
const normalizeIndex = (idx: number, length: number): number => {
return idx >= 0 ? idx : length + idx;
};
const nStart = normalizeIndex(start, len);
const nEnd = normalizeIndex(end, len);
// Calculate bounds based on step direction
let lower: number, upper: number;
if (step >= 0) {
lower = Math.min(Math.max(nStart, 0), len);
upper = Math.min(Math.max(nEnd, 0), len);
} else {
upper = Math.min(Math.max(nStart, -1), len - 1);
lower = Math.min(Math.max(nEnd, -1), len - 1);
}
// Select elements based on step direction
if (step > 0) {
for (let idx = lower; idx < upper; idx += step) {
output.push(new Value(input, idx, data[idx]));
}
} else if (step < 0) {
for (let idx = upper; idx > lower; idx += step) {
output.push(new Value(input, idx, data[idx]));
}
}
}
}
protected evalFilter(inputs: Value[], selector: types.FilterSelector, output: Value[] = []): void {
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
const data = input.data;
// Special case: if this is a root-level filter on a single object,
// treat the object itself as the element being filtered
if (input.step === '$' && data && typeof data === 'object' && !Array.isArray(data)) {
if (this.evalFilterExpression(selector.expression, input)) {
output.push(input);
}
} else if (Array.isArray(data)) {
// Filter array elements
for (let j = 0; j < data.length; j++) {
const element = data[j];
const elementValue = new Value(input, j, element);
if (this.evalFilterExpression(selector.expression, elementValue)) {
output.push(elementValue);
}
}
} else IEif (data && typeof data === 'object') {
// Filter object member values
for (const key in data) {
// biome-ignore lint: object hasOwnProperty check is intentional, Object.hasOwn is too recent
Iif (data.hasOwnProperty(key)) {
const memberValue = (data as any)[key];
const memberValueNode = new Value(input, key, memberValue);
Iif (this.evalFilterExpression(selector.expression, memberValueNode)) {
output.push(memberValueNode);
}
}
}
}
// For primitive values, filter selects nothing
}
}
protected evalRecursiveDescent(
inputs: Value[],
selector: types.RecursiveDescentSelector,
output: Value[] = [],
): void {
const length = inputs.length;
for (let i = 0; i < length; i++) {
const input = inputs[i];
// Collect all descendants (including the input node itself)
const descendants: Value[] = [];
this.collectDescendants(input, descendants);
// Apply the wrapped selector to all descendants
this.evalSelector(descendants, selector.selector, output);
}
}
private collectDescendants(node: Value, output: Value[]): void {
output.push(node);
const data = node.data;
if (Array.isArray(data)) {
// Visit array elements in order
for (let i = 0; i < data.length; i++) {
const child = new Value(node, i, data[i]);
this.collectDescendants(child, output);
}
} else if (data && typeof data === 'object') {
// Visit object member values (order not guaranteed)
for (const key in data) {
// biome-ignore lint: object hasOwnProperty check is intentional, Object.hasOwn is too recent
if (data.hasOwnProperty(key)) {
const child = new Value(node, key, (data as any)[key]);
this.collectDescendants(child, output);
}
}
}
// For primitive values, no children to visit
}
private evalFilterExpression(expression: types.FilterExpression, currentNode: Value): boolean {
// Simplified implementation of filter expression evaluation
switch (expression.type) {
case 'comparison':
return this.evalComparisonExpression(expression, currentNode);
case 'logical':
return this.evalLogicalExpression(expression, currentNode);
case 'existence':
return this.evalExistenceExpression(expression, currentNode);
case 'negation':
return !this.evalFilterExpression(expression.expression, currentNode);
case 'paren':
return this.evalFilterExpression(expression.expression, currentNode);
case 'function':
return this.evalFunctionExpression(expression, currentNode);
default:
return false;
}
}
private evalComparisonExpression(expression: types.ComparisonExpression, currentNode: Value): boolean {
const leftValue = this.evalValueExpression(expression.left, currentNode);
const rightValue = this.evalValueExpression(expression.right, currentNode);
// JSONPath semantics: comparisons involving Nothing (undefined) evaluate to false,
// except when both sides are Nothing and operator is equality.
// BUT: functions can return valid values including 0, false, "", etc. Only treat
// actual undefined (meaning "no result") as Nothing.
if (leftValue === undefined || rightValue === undefined) {
Iif (expression.operator === '==' && leftValue === undefined && rightValue === undefined) {
return true;
}
return false;
}
switch (expression.operator) {
case '==':
return this.compareEqual(leftValue, rightValue);
case '!=':
return !this.compareEqual(leftValue, rightValue);
case '<':
return this.compareLess(leftValue, rightValue);
case '<=':
return this.compareLess(leftValue, rightValue) || this.compareEqual(leftValue, rightValue);
case '>':
return this.compareLess(rightValue, leftValue);
case '>=':
return this.compareLess(rightValue, leftValue) || this.compareEqual(leftValue, rightValue);
default:
return false;
}
}
private evalLogicalExpression(expression: types.LogicalExpression, currentNode: Value): boolean {
switch (expression.operator) {
case '&&':
return (
this.evalFilterExpression(expression.left, currentNode) &&
this.evalFilterExpression(expression.right, currentNode)
);
case '||':
return (
this.evalFilterExpression(expression.left, currentNode) ||
this.evalFilterExpression(expression.right, currentNode)
);
default:
return false;
}
}
private evalExistenceExpression(expression: types.ExistenceExpression, currentNode: Value): boolean {
// Evaluate the path from the current node and check if it selects any nodes
Iif (!expression.path.segments) return false;
const evaluator = new JsonPathEval(expression.path, currentNode.data);
const result = evaluator.eval();
return result.length > 0;
}
private evalFunctionExpression(expression: types.FunctionExpression, currentNode: Value): boolean {
const result = this.evaluateFunction(expression, currentNode);
// Functions in test expressions should return LogicalType
// If the function returns a value, convert it to boolean
if (typeof result === 'boolean') {
return result;
}
// For count() and length() returning numbers, convert to boolean (non-zero is true)
Iif (typeof result === 'number') {
return result !== 0;
}
// For nodelists, true if non-empty
Iif (Array.isArray(result)) {
return result.length > 0;
}
// For other values, check if they exist (not null/undefined)
return result != null;
}
private evalValueExpression(expression: types.ValueExpression, currentNode: Value): any {
switch (expression.type) {
case 'current':
return currentNode.data;
case 'root':
return this.data;
case 'literal':
return expression.value;
case 'path': {
Iif (!expression.path.segments) return undefined;
// Evaluate path segments starting from current node
let currentResults = [currentNode];
for (const segment of expression.path.segments) {
currentResults = this.evalSegment(currentResults, segment);
if (currentResults.length === 0) break; // No results, early exit
}
// For function arguments, we want the actual data, not Value objects
return currentResults.map(v => v.data);
}
case 'function':
return this.evaluateFunction(expression, currentNode);
default:
return undefined;
}
}
private compareEqual(left: any, right: any): boolean {
// Handle empty nodelist/Nothing cases
Iif (left === undefined && right === undefined) return true;
Iif (left === undefined || right === undefined) return false;
// Auto-unwrap single-element arrays for comparison (JSONPath behavior)
if (Array.isArray(left) && left.length === 1) left = left[0];
Iif (Array.isArray(right) && right.length === 1) right = right[0];
// After unwrapping, check for undefined again
Iif (left === undefined || right === undefined) return false;
// Strict equality for primitives
if (left === right) return true;
// Type mismatch
if (typeof left !== typeof right) return false;
// Array comparison
Iif (Array.isArray(left) && Array.isArray(right)) {
Iif (left.length !== right.length) return false;
for (let i = 0; i < left.length; i++) {
Iif (!this.compareEqual(left[i], right[i])) return false;
}
return true;
}
// Object comparison
Iif (left && right && typeof left === 'object' && typeof right === 'object') {
const leftKeys = Object.keys(left);
const rightKeys = Object.keys(right);
Iif (leftKeys.length !== rightKeys.length) return false;
for (const key of leftKeys) {
Iif (!rightKeys.includes(key)) return false;
Iif (!this.compareEqual(left[key], right[key])) return false;
}
return true;
}
return false;
}
private compareLess(left: any, right: any): boolean {
// Handle empty nodelist/Nothing cases
Iif (left === undefined || right === undefined) return false;
// Auto-unwrap single-element arrays for comparison (JSONPath behavior)
if (Array.isArray(left) && left.length === 1) left = left[0];
Iif (Array.isArray(right) && right.length === 1) right = right[0];
// After unwrapping, check for undefined again
Iif (left === undefined || right === undefined) return false;
// Both numbers
if (typeof left === 'number' && typeof right === 'number') {
return left < right;
}
// Both strings
Iif (typeof left === 'string' && typeof right === 'string') {
return left < right;
}
// Other types don't support < comparison
return false;
}
/**
* Evaluate a function expression according to RFC 9535
* Uses the function registry for extensible function support
*/
private evaluateFunction(expression: types.FunctionExpression, currentNode: Value): any {
const { name, args } = expression;
const func = this.funcs.get(name);
if (func) {
return func(args, currentNode, this);
}
// Unknown function - return false for logical context, undefined for value context
return false;
}
/**
* length() function - returns the length of strings, arrays, or objects
* Parameters: ValueType
* Result: ValueType (unsigned integer or Nothing)
*/
private lengthFunction(args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval): number | undefined {
if (args.length !== 1) return undefined;
const [arg] = args;
const result = this.getValueFromArg(arg, currentNode, evaluator);
// For length() function, we need the single value
let value: any;
if (Array.isArray(result)) {
value = result.length === 1 ? result[0] : undefined;
} else {
value = result;
}
if (typeof value === 'string') {
// Count Unicode scalar values
return [...value].length;
}
if (Array.isArray(value)) {
return value.length;
}
if (value && typeof value === 'object' && value !== null) {
return Object.keys(value).length;
}
return undefined; // Nothing for other types
}
/**
* count() function - returns the number of nodes in a nodelist
* Parameters: NodesType
* Result: ValueType (unsigned integer)
*/
private countFunction(args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval): number {
Iif (args.length !== 1) return 0;
const [arg] = args;
const result = this.getValueFromArg(arg, currentNode, evaluator);
// Count logic based on RFC 9535:
// For count(), we count the number of nodes selected by the expression
if (Array.isArray(result)) {
return result.length;
} else Eif (result === undefined) {
return 0;
} else {
// Single value = 1 node selected
return 1;
}
}
/**
* match() function - tests if a string matches a regular expression (full match)
* Parameters: ValueType (string), ValueType (string conforming to RFC9485)
* Result: LogicalType
*/
private matchFunction(args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval): boolean {
Iif (args.length !== 2) return false;
const [stringArg, regexArg] = args;
const strResult = this.getValueFromArg(stringArg, currentNode, evaluator);
const regexResult = this.getValueFromArg(regexArg, currentNode, evaluator);
// Handle array results (get single value)
const str = Array.isArray(strResult) ? (strResult.length === 1 ? strResult[0] : undefined) : strResult;
const regex = Array.isArray(regexResult) ? (regexResult.length === 1 ? regexResult[0] : undefined) : regexResult;
if (typeof str !== 'string' || typeof regex !== 'string') {
return false;
}
try {
// RFC 9485 I-Regexp is a subset of JavaScript regex
const regExp = new RegExp(`^${regex}$`);
return regExp.test(str);
} catch {
return false;
}
}
/**
* search() function - tests if a string contains a substring matching a regular expression
* Parameters: ValueType (string), ValueType (string conforming to RFC9485)
* Result: LogicalType
*/
private searchFunction(args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval): boolean {
Iif (args.length !== 2) return false;
const [stringArg, regexArg] = args;
const strResult = this.getValueFromArg(stringArg, currentNode, evaluator);
const regexResult = this.getValueFromArg(regexArg, currentNode, evaluator);
// Handle array results (get single value)
const str = Array.isArray(strResult) ? (strResult.length === 1 ? strResult[0] : undefined) : strResult;
const regex = Array.isArray(regexResult) ? (regexResult.length === 1 ? regexResult[0] : undefined) : regexResult;
if (typeof str !== 'string' || typeof regex !== 'string') {
return false;
}
try {
// RFC 9485 I-Regexp is a subset of JavaScript regex
const regExp = new RegExp(regex);
return regExp.test(str);
} catch {
return false;
}
}
/**
* value() function - converts a nodelist to a single value
* Parameters: NodesType
* Result: ValueType
*/
private valueFunction(args: (types.ValueExpression | types.FilterExpression | types.JSONPath)[], currentNode: Value, evaluator: JsonPathEval): any {
Iif (args.length !== 1) return undefined;
const [nodeArg] = args;
const result = this.getValueFromArg(nodeArg, currentNode, evaluator);
// For value() function, return single value if exactly one result,
// otherwise undefined (following RFC 9535 value() semantics)
if (Array.isArray(result)) {
return result.length === 1 ? result[0] : undefined;
} else E{
return result;
}
}
/**
* Helper to get value from function argument
*/
private getValueFromArg(arg: types.ValueExpression | types.FilterExpression | types.JSONPath, currentNode: Value, evaluator: JsonPathEval): any {
if (this.isValueExpression(arg)) {
return evaluator.evalValueExpression(arg, currentNode);
} else IEif (this.isJSONPath(arg)) {
// Regular $ expression - evaluate from root
const evalInstance = new JsonPathEval(arg, currentNode.data);
const result = evalInstance.eval();
return result.length === 1 ? result[0].data : undefined;
}
return undefined;
}
/**
* Type guard for ValueExpression
*/
private isValueExpression(arg: any): arg is types.ValueExpression {
return arg && typeof arg === 'object' &&
['current', 'root', 'literal', 'path', 'function'].includes(arg.type);
}
/**
* Type guard for JSONPath
*/
private isJSONPath(arg: any): arg is types.JSONPath {
return arg && typeof arg === 'object' &&
Array.isArray(arg.segments);
}
}
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