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