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node_modules | ||
node_modules/* | ||
npm_debug.log |
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var request = require('request') | ||
, JSONStream = require('JSONStream') | ||
, es = require('event-stream') | ||
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var parser = JSONStream.parse(['rows', /./]) //emit parts that match this path (any element of the rows array) | ||
, req = request({url: 'http://isaacs.couchone.com/registry/_all_docs'}) | ||
, logger = es.mapSync(function (data) { //create a stream that logs to stderr, | ||
console.error(data) | ||
return data | ||
}) | ||
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req.pipe(parser) | ||
parser.pipe(logger) |
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var Parser = require('jsonparse') | ||
, Stream = require('stream').Stream | ||
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/* | ||
the value of this.stack that creationix's jsonparse has is weird. | ||
it makes this code ugly, but his problem is way harder that mine, | ||
so i'll forgive him. | ||
*/ | ||
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exports.parse = function (path) { | ||
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var stream = new Stream() | ||
var parser = new Parser() | ||
var count = 0 | ||
if(!path.length) | ||
path = null | ||
parser.onValue = function () { | ||
if(!this.root && this.stack.length == 1){ | ||
stream.root = this.value | ||
} | ||
if(!path || this.stack.length !== path.length) | ||
return | ||
var _path = [] | ||
for( var i = 0; i < (path.length - 1); i++) { | ||
var key = path[i] | ||
var c = this.stack[1 + (+i)] | ||
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if(!c) { | ||
console.log(c, this.stack.length) | ||
return | ||
} | ||
var m = | ||
( 'string' === typeof key | ||
? c.key == key | ||
: key.exec(c.key)) | ||
_path.push(c.key) | ||
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if(!m) | ||
return | ||
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} | ||
var c = this | ||
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var key = path[path.length - 1] | ||
var m = | ||
( 'string' === typeof key | ||
? c.key == key | ||
: key.exec(c.key)) | ||
if(!m) | ||
return | ||
_path.push(c.key) | ||
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count ++ | ||
stream.emit('data', this.value[this.key]) | ||
} | ||
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parser.onError = function (err) { | ||
stream.emit('error', err) | ||
} | ||
stream.readable = true | ||
stream.writable = true | ||
stream.write = function (chunk) { | ||
parser.write(chunk) | ||
} | ||
stream.end = function (data) { | ||
if(data) | ||
stream.write(data) | ||
if(!count) | ||
stream.emit('data', stream.root) | ||
stream.emit('end') | ||
} | ||
return stream | ||
} |
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{ "name": "JSONStream" | ||
, "version": "0.0.0" | ||
, "description": "rawStream.pipe(JSONStream.parse()).pipe(streamOfObjects)" | ||
, "homepage": "http://github.com/dominictarr/JSONStream" | ||
, "repository": | ||
{ "type": "git" | ||
, "url": "https://github.com/dominictarr/JSONStream.git" } | ||
, "dependencies": {} | ||
, "devDependencies": {} | ||
, "author": "Dominic Tarr <dominic.tarr@gmail.com> (http://bit.ly/dominictarr)" | ||
, "scripts": { "test": "meta-test test/*.js" } } |
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# JSONStream | ||
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streaming JSON.parse and stringify | ||
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## example | ||
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in node v0.4.x | ||
```js | ||
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var request = require('request') | ||
, JSONStream = require('JSONStream') | ||
, es = require('event-stream') | ||
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var parser = JSONStream.parse(['rows', /./]) //emit parts that match this path (any element of the rows array) | ||
, req = request({url: 'http://isaacs.couchone.com/registry/_all_docs'}) | ||
``` | ||
in node 0.4.x | ||
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``` js | ||
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req.pipe(parser) | ||
parser.pipe(es.log('')) | ||
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``` | ||
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in node v0.5.x | ||
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```js | ||
req.pipe(parser).pipe(es.log('')) | ||
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``` | ||
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## JSONStream.parse(path) | ||
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usally, a json API will return a list of objects. | ||
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`path` should be an array of property names and/or `RedExp`s. | ||
any object that matches the path will be emitted as 'data' (and `pipe()`d down stream) | ||
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if `path` is empty or null, or if no matches are made: | ||
JSONStream.parse will only emit 'data' once, emitting the root object. | ||
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for example, couchdb returns views like this: | ||
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``` bash | ||
curl -sS localhost:5984/tests/_all_docs | ||
``` | ||
returns this: | ||
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``` js | ||
{"total_rows":129,"offset":0,"rows":[ | ||
{ "id":"change1_0.6995461115147918" | ||
, "key":"change1_0.6995461115147918" | ||
, "value":{"rev":"1-e240bae28c7bb3667f02760f6398d508"} | ||
, "doc":{ | ||
"_id": "change1_0.6995461115147918" | ||
, "_rev": "1-e240bae28c7bb3667f02760f6398d508","hello":1} | ||
}, | ||
{"id":"change2_0.6995461115147918","key":"change2_0.6995461115147918","value":{"rev":"1-13677d36b98c0c075145bb8975105153"},"doc":{"_id":"change2_0.6995461115147918","_rev":"1-13677d36b98c0c075145bb8975105153","hello":2}}, | ||
... | ||
]} | ||
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``` | ||
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we are probably interested in the `rows.*.docs` | ||
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create a `Stream` that parses the documents from the feed like this: | ||
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``` js | ||
JSONStream.parse(['rows', /./, 'doc']) //rows, ANYTHING, doc | ||
``` | ||
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awesome! | ||
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## todo | ||
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* JSONStream.stringify() | ||
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## Acknowlegements | ||
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this module depends on https://github.com/creationix/jsonparse | ||
by Tim Caswell | ||
and also thanks to Florent Jaby for teaching me about parsing with: | ||
https://github.com/Floby/node-json-streams |
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