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JavaScript

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