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  "readme": "JS-YAML - YAML 1.2 parser / writer for JavaScript\n=================================================\n\n[![Build Status](https://travis-ci.org/nodeca/js-yaml.svg?branch=master)](https://travis-ci.org/nodeca/js-yaml)\n[![NPM version](https://img.shields.io/npm/v/js-yaml.svg)](https://www.npmjs.org/package/js-yaml)\n\n__[Online Demo](http://nodeca.github.com/js-yaml/)__\n\n\nThis is an implementation of [YAML](http://yaml.org/), a human-friendly data\nserialization language. Started as [PyYAML](http://pyyaml.org/) port, it was\ncompletely rewritten from scratch. Now it's very fast, and supports 1.2 spec.\n\n\nInstallation\n------------\n\n### YAML module for node.js\n\n```\nnpm install js-yaml\n```\n\n\n### CLI executable\n\nIf you want to inspect your YAML files from CLI, install js-yaml globally:\n\n```\nnpm install -g js-yaml\n```\n\n#### Usage\n\n```\nusage: js-yaml [-h] [-v] [-c] [-t] file\n\nPositional arguments:\n  file           File with YAML document(s)\n\nOptional arguments:\n  -h, --help     Show this help message and exit.\n  -v, --version  Show program's version number and exit.\n  -c, --compact  Display errors in compact mode\n  -t, --trace    Show stack trace on error\n```\n\n\n### Bundled YAML library for browsers\n\n``` html\n<!-- esprima required only for !!js/function -->\n<script src=\"esprima.js\"></script>\n<script src=\"js-yaml.min.js\"></script>\n<script type=\"text/javascript\">\nvar doc = jsyaml.load('greeting: hello\\nname: world');\n</script>\n```\n\nBrowser support was done mostly for the online demo. If you find any errors - feel\nfree to send pull requests with fixes. Also note, that IE and other old browsers\nneeds [es5-shims](https://github.com/kriskowal/es5-shim) to operate.\n\nNotes:\n\n1. We have no resources to support browserified version. Don't expect it to be\n   well tested. Don't expect fast fixes if something goes wrong there.\n2. `!!js/function` in browser bundle will not work by default. If you really need\n   it - load `esprima` parser first (via amd or directly).\n3. `!!bin` in browser will return `Array`, because browsers do not support\n   node.js `Buffer` and adding Buffer shims is completely useless on practice.\n\n\nAPI\n---\n\nHere we cover the most 'useful' methods. If you need advanced details (creating\nyour own tags), see [wiki](https://github.com/nodeca/js-yaml/wiki) and\n[examples](https://github.com/nodeca/js-yaml/tree/master/examples) for more\ninfo.\n\n``` javascript\nyaml = require('js-yaml');\nfs   = require('fs');\n\n// Get document, or throw exception on error\ntry {\n  var doc = yaml.safeLoad(fs.readFileSync('/home/ixti/example.yml', 'utf8'));\n  console.log(doc);\n} catch (e) {\n  console.log(e);\n}\n```\n\n\n### safeLoad (string [ , options ])\n\n**Recommended loading way.** Parses `string` as single YAML document. Returns a JavaScript\nobject or throws `YAMLException` on error. By default, does not support regexps,\nfunctions and undefined. This method is safe for untrusted data.\n\noptions:\n\n- `filename` _(default: null)_ - string to be used as a file path in\n  error/warning messages.\n- `onWarning` _(default: null)_ - function to call on warning messages.\n  Loader will throw on warnings if this function is not provided.\n- `schema` _(default: `DEFAULT_SAFE_SCHEMA`)_ - specifies a schema to use.\n  - `FAILSAFE_SCHEMA` - only strings, arrays and plain objects:\n    http://www.yaml.org/spec/1.2/spec.html#id2802346\n  - `JSON_SCHEMA` - all JSON-supported types:\n    http://www.yaml.org/spec/1.2/spec.html#id2803231\n  - `CORE_SCHEMA` - same as `JSON_SCHEMA`:\n    http://www.yaml.org/spec/1.2/spec.html#id2804923\n  - `DEFAULT_SAFE_SCHEMA` - all supported YAML types, without unsafe ones\n    (`!!js/undefined`, `!!js/regexp` and `!!js/function`):\n    http://yaml.org/type/\n  - `DEFAULT_FULL_SCHEMA` - all supported YAML types.\n- `json` _(default: false)_ - compatibility with JSON.parse behaviour. If true, then duplicate keys in a mapping will override values rather than throwing an error.\n\nNOTE: This function **does not** understand multi-document sources, it throws\nexception on those.\n\nNOTE: JS-YAML **does not** support schema-specific tag resolution restrictions.\nSo, the JSON schema is not as strictly defined in the YAML specification.\nIt allows numbers in any notation, use `Null` and `NULL` as `null`, etc.\nThe core schema also has no such restrictions. It allows binary notation for integers.\n\n\n### load (string [ , options ])\n\n**Use with care with untrusted sources**. The same as `safeLoad()` but uses\n`DEFAULT_FULL_SCHEMA` by default - adds some JavaScript-specific types:\n`!!js/function`, `!!js/regexp` and `!!js/undefined`. For untrusted sources, you\nmust additionally validate object structure to avoid injections:\n\n``` javascript\nvar untrusted_code = '\"toString\": !<tag:yaml.org,2002:js/function> \"function (){very_evil_thing();}\"';\n\n// I'm just converting that string, what could possibly go wrong?\nrequire('js-yaml').load(untrusted_code) + ''\n```\n\n\n### safeLoadAll (string, iterator [ , options ])\n\nSame as `safeLoad()`, but understands multi-document sources and applies\n`iterator` to each document.\n\n``` javascript\nvar yaml = require('js-yaml');\n\nyaml.safeLoadAll(data, function (doc) {\n  console.log(doc);\n});\n```\n\n\n### loadAll (string, iterator [ , options ])\n\nSame as `safeLoadAll()` but uses `DEFAULT_FULL_SCHEMA` by default.\n\n\n### safeDump (object [ , options ])\n\nSerializes `object` as a YAML document. Uses `DEFAULT_SAFE_SCHEMA`, so it will\nthrow an exception if you try to dump regexps or functions. However, you can\ndisable exceptions by setting the `skipInvalid` option to `true`.\n\noptions:\n\n- `indent` _(default: 2)_ - indentation width to use (in spaces).\n- `skipInvalid` _(default: false)_ - do not throw on invalid types (like function\n  in the safe schema) and skip pairs and single values with such types.\n- `flowLevel` (default: -1) - specifies level of nesting, when to switch from\n  block to flow style for collections. -1 means block style everwhere\n- `styles` - \"tag\" => \"style\" map. Each tag may have own set of styles.\n- `schema` _(default: `DEFAULT_SAFE_SCHEMA`)_ specifies a schema to use.\n- `sortKeys` _(default: `false`)_ - if `true`, sort keys when dumping YAML. If a\n  function, use the function to sort the keys.\n- `lineWidth` _(default: `80`)_ - set max line width.\n- `noRefs` _(default: `false`)_ - if `true`, don't convert duplicate objects into references\n- `noCompatMode` _(default: `false`)_ - if `true` don't try to be compatible with older\n  yaml versions. Currently: don't quote \"yes\", \"no\" and so on, as required for YAML 1.1\n\nThe following table show availlable styles (e.g. \"canonical\",\n\"binary\"...) available for each tag (.e.g. !!null, !!int ...). Yaml\nouput is shown on the right side after `=>` (default setting) or `->`:\n\n``` none\n!!null\n  \"canonical\"   -> \"~\"\n  \"lowercase\"   => \"null\"\n  \"uppercase\"   -> \"NULL\"\n  \"camelcase\"   -> \"Null\"\n\n!!int\n  \"binary\"      -> \"0b1\", \"0b101010\", \"0b1110001111010\"\n  \"octal\"       -> \"01\", \"052\", \"016172\"\n  \"decimal\"     => \"1\", \"42\", \"7290\"\n  \"hexadecimal\" -> \"0x1\", \"0x2A\", \"0x1C7A\"\n\n!!bool\n  \"lowercase\"   => \"true\", \"false\"\n  \"uppercase\"   -> \"TRUE\", \"FALSE\"\n  \"camelcase\"   -> \"True\", \"False\"\n\n!!float\n  \"lowercase\"   => \".nan\", '.inf'\n  \"uppercase\"   -> \".NAN\", '.INF'\n  \"camelcase\"   -> \".NaN\", '.Inf'\n```\n\nExample:\n\n``` javascript\nsafeDump (object, {\n  'styles': {\n    '!!null': 'canonical' // dump null as ~\n  },\n  'sortKeys': true        // sort object keys\n});\n```\n\n### dump (object [ , options ])\n\nSame as `safeDump()` but without limits (uses `DEFAULT_FULL_SCHEMA` by default).\n\n\nSupported YAML types\n--------------------\n\nThe list of standard YAML tags and corresponding JavaScipt types. See also\n[YAML tag discussion](http://pyyaml.org/wiki/YAMLTagDiscussion) and\n[YAML types repository](http://yaml.org/type/).\n\n```\n!!null ''                   # null\n!!bool 'yes'                # bool\n!!int '3...'                # number\n!!float '3.14...'           # number\n!!binary '...base64...'     # buffer\n!!timestamp 'YYYY-...'      # date\n!!omap [ ... ]              # array of key-value pairs\n!!pairs [ ... ]             # array or array pairs\n!!set { ... }               # array of objects with given keys and null values\n!!str '...'                 # string\n!!seq [ ... ]               # array\n!!map { ... }               # object\n```\n\n**JavaScript-specific tags**\n\n```\n!!js/regexp /pattern/gim            # RegExp\n!!js/undefined ''                   # Undefined\n!!js/function 'function () {...}'   # Function\n```\n\nCaveats\n-------\n\nNote, that you use arrays or objects as key in JS-YAML. JS does not allow objects\nor arrays as keys, and stringifies (by calling .toString method) them at the\nmoment of adding them.\n\n``` yaml\n---\n? [ foo, bar ]\n: - baz\n? { foo: bar }\n: - baz\n  - baz\n```\n\n``` javascript\n{ \"foo,bar\": [\"baz\"], \"[object Object]\": [\"baz\", \"baz\"] }\n```\n\nAlso, reading of properties on implicit block mapping keys is not supported yet.\nSo, the following YAML document cannot be loaded.\n\n``` yaml\n&anchor foo:\n  foo: bar\n  *anchor: duplicate key\n  baz: bat\n  *anchor: duplicate key\n```\n\n\nBreaking changes in 2.x.x -> 3.x.x\n----------------------------------\n\nIf you have not used __custom__ tags or loader classes and not loaded yaml\nfiles via `require()`, no changes are needed. Just upgrade the library.\n\nOtherwise, you should:\n\n1. Replace all occurences of `require('xxxx.yml')` by `fs.readFileSync()` +\n  `yaml.safeLoad()`.\n2. rewrite your custom tags constructors and custom loader\n  classes, to conform the new API. See\n  [examples](https://github.com/nodeca/js-yaml/tree/master/examples) and\n  [wiki](https://github.com/nodeca/js-yaml/wiki) for details.\n\n\nLicense\n-------\n\nView the [LICENSE](https://github.com/nodeca/js-yaml/blob/master/LICENSE) file\n(MIT).\n",
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