mirror of https://github.com/jkjoy/sunpeiwen.git
119 lines
2.9 KiB
JavaScript
119 lines
2.9 KiB
JavaScript
var utils = require('../utils')
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, nodes = require('../nodes')
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, readFile = require('fs').readFileSync;
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/**
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* Convert a .json file into stylus variables or object.
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* Nested variable object keys are joined with a dash (-)
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*
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* Given this sample media-queries.json file:
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* {
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* "small": "screen and (max-width:400px)",
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* "tablet": {
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* "landscape": "screen and (min-width:600px) and (orientation:landscape)",
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* "portrait": "screen and (min-width:600px) and (orientation:portrait)"
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* }
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* }
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*
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* Examples:
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*
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* json('media-queries.json')
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*
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* @media small
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* // => @media screen and (max-width:400px)
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*
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* @media tablet-landscape
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* // => @media screen and (min-width:600px) and (orientation:landscape)
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*
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* vars = json('vars.json', { hash: true })
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* body
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* width: vars.width
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*
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* @param {String} path
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* @param {Boolean} [local]
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* @param {String} [namePrefix]
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* @api public
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*/
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function json(path, local, namePrefix){
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utils.assertString(path, 'path');
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// lookup
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path = path.string;
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var found = utils.lookup(path, this.options.paths, this.options.filename)
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, options = (local && 'object' == local.nodeName) && local;
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if (!found) {
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// optional JSON file
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if (options && options.get('optional').toBoolean().isTrue) {
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return nodes.null;
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}
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throw new Error('failed to locate .json file ' + path);
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}
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// read
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var json = JSON.parse(readFile(found, 'utf8'));
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if (options) {
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return convert(json, options);
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} else {
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oldJson.call(this, json, local, namePrefix);
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}
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function convert(obj, options){
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var ret = new nodes.Object()
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, leaveStrings = options.get('leave-strings').toBoolean();
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for (var key in obj) {
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var val = obj[key];
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if ('object' == typeof val) {
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ret.set(key, convert(val, options));
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} else {
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val = utils.coerce(val);
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if ('string' == val.nodeName && leaveStrings.isFalse) {
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val = utils.parseString(val.string);
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}
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ret.set(key, val);
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}
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}
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return ret;
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}
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};
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json.params = ['path', 'local', 'namePrefix'];
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module.exports = json;
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/**
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* Old `json` BIF.
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*
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* @api private
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*/
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function oldJson(json, local, namePrefix){
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if (namePrefix) {
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utils.assertString(namePrefix, 'namePrefix');
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namePrefix = namePrefix.val;
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} else {
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namePrefix = '';
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}
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local = local ? local.toBoolean() : new nodes.Boolean(local);
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var scope = local.isTrue ? this.currentScope : this.global.scope;
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convert(json);
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return;
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function convert(obj, prefix){
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prefix = prefix ? prefix + '-' : '';
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for (var key in obj){
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var val = obj[key];
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var name = prefix + key;
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if ('object' == typeof val) {
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convert(val, name);
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} else {
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val = utils.coerce(val);
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if ('string' == val.nodeName) val = utils.parseString(val.string);
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scope.add({ name: namePrefix + name, val: val });
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}
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}
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}
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};
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