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91 lines
3.4 KiB
91 lines
3.4 KiB
4 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.stringify = void 0;
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const stringify_1 = require("./stringify");
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const quote_1 = require("./quote");
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/**
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* Root path node.
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*/
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const ROOT_SENTINEL = Symbol("root");
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/**
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* Stringify any JavaScript value.
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*/
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function stringify(value, replacer, indent, options = {}) {
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const space = typeof indent === "string" ? indent : " ".repeat(indent || 0);
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const path = [];
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const stack = new Set();
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const tracking = new Map();
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const unpack = new Map();
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let valueCount = 0;
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const { maxDepth = 100, references = false, skipUndefinedProperties = false, maxValues = 100000, } = options;
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// Wrap replacer function to support falling back on supported stringify.
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const valueToString = replacerToString(replacer);
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// Every time you call `next(value)` execute this function.
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const onNext = (value, key) => {
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if (++valueCount > maxValues)
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return;
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if (skipUndefinedProperties && value === undefined)
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return;
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if (path.length > maxDepth)
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return;
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// An undefined key is treated as an out-of-band "value".
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if (key === undefined)
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return valueToString(value, space, onNext, key);
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path.push(key);
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const result = builder(value, key === ROOT_SENTINEL ? undefined : key);
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path.pop();
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return result;
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};
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const builder = references
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? (value, key) => {
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if (value !== null &&
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(typeof value === "object" ||
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typeof value === "function" ||
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typeof value === "symbol")) {
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// Track nodes to restore later.
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if (tracking.has(value)) {
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unpack.set(path.slice(1), tracking.get(value));
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// Use `undefined` as temporaray stand-in for referenced nodes
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return valueToString(undefined, space, onNext, key);
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}
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// Track encountered nodes.
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tracking.set(value, path.slice(1));
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}
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return valueToString(value, space, onNext, key);
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}
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: (value, key) => {
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// Stop on recursion.
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if (stack.has(value))
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return;
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stack.add(value);
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const result = valueToString(value, space, onNext, key);
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stack.delete(value);
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return result;
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};
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const result = onNext(value, ROOT_SENTINEL);
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// Attempt to restore circular references.
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if (unpack.size) {
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const sp = space ? " " : "";
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const eol = space ? "\n" : "";
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let wrapper = `var x${sp}=${sp}${result};${eol}`;
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for (const [key, value] of unpack.entries()) {
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const keyPath = quote_1.stringifyPath(key, onNext);
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const valuePath = quote_1.stringifyPath(value, onNext);
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wrapper += `x${keyPath}${sp}=${sp}x${valuePath};${eol}`;
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}
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return `(function${sp}()${sp}{${eol}${wrapper}return x;${eol}}())`;
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}
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return result;
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}
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exports.stringify = stringify;
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/**
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* Create `toString()` function from replacer.
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*/
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function replacerToString(replacer) {
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if (!replacer)
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return stringify_1.toString;
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return (value, space, next, key) => {
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return replacer(value, space, (value) => stringify_1.toString(value, space, next, key), key);
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};
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}
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//# sourceMappingURL=index.js.map
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