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113 lines
3.1 KiB
JavaScript
113 lines
3.1 KiB
JavaScript
/**
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* stringifier
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*
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* https://github.com/twada/stringifier
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*
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* Copyright (c) 2014-2018 Takuto Wada
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* Licensed under the MIT license.
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* https://twada.mit-license.org/2014-2018
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*/
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'use strict';
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var traverse = require('traverse');
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var typeName = require('type-name');
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var assign = require('core-js/library/fn/object/assign');
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var endsWith = require('core-js/library/fn/string/ends-with');
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var s = require('./strategies');
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function defaultHandlers () {
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return {
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'null': s.always('null'),
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'undefined': s.always('undefined'),
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'function': s.prune(),
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'string': s.json(),
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'boolean': s.json(),
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'number': s.number(),
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'symbol': s.toStr(),
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'RegExp': s.toStr(),
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'String': s.newLike(),
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'Boolean': s.newLike(),
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'Number': s.newLike(),
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'Date': s.newLike(),
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'Array': s.array(),
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'Object': s.object(),
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'Error': s.object(null, ['message', 'code']),
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'@default': s.object()
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};
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}
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function defaultOptions () {
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return {
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maxDepth: null,
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indent: null,
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anonymous: '@Anonymous',
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circular: '#@Circular#',
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snip: '..(snip)',
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lineSeparator: '\n',
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typeFun: typeName
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};
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}
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function createStringifier (customOptions) {
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var options = assign({}, defaultOptions(), customOptions);
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var handlers = assign({}, defaultHandlers(), options.handlers);
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return function stringifyAny (push, x) {
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var context = this;
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var handler = handlerFor(context.node, options, handlers);
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var currentPath = '/' + context.path.join('/');
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var customization = handlers[currentPath];
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var acc = {
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context: context,
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options: options,
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handlers: handlers,
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push: push
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};
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if (typeName(customization) === 'function') {
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handler = customization;
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} else if (typeName(customization) === 'number') {
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handler = s.flow.compose(s.filters.truncate(customization),handler);
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} else if (context.parent && typeName(context.parent.node) === 'Array' && !(context.key in context.parent.node)) {
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// sparse arrays
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handler = s.always('');
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}
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handler(acc, x);
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return push;
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};
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}
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function handlerFor (val, options, handlers) {
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var tname = options.typeFun(val);
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if (typeName(handlers[tname]) === 'function') {
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return handlers[tname];
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}
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if (endsWith(tname, 'Error')) {
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return handlers['Error'];
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}
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return handlers['@default'];
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}
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function walk (val, reducer) {
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var buffer = [];
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var push = function (str) {
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buffer.push(str);
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};
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traverse(val).reduce(reducer, push);
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return buffer.join('');
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}
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function stringify (val, options) {
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return walk(val, createStringifier(options));
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}
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function stringifier (options) {
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return function (val) {
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return walk(val, createStringifier(options));
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};
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}
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stringifier.stringify = stringify;
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stringifier.strategies = s;
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stringifier.defaultOptions = defaultOptions;
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stringifier.defaultHandlers = defaultHandlers;
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module.exports = stringifier;
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