Install cpan yaml

This is how YAML can serialize duplicate and recursive structures. Sometimes, when you KNOW that your data is nonrecursive in nature, you may want to serialize such that every node is expressed in full. This also may result in faster processing because the lookup overhead is by bypassed.

If your data is recursive, this option will cause Dump to run in an endless loop, chewing up your computers memory. You have been warned. It is important to remember that although YAML is heavily influenced by Perl and Python, it is a language in its own right, not merely just a representation of Perl structures. YAML has three constructs that are conspicuously similar to Perl's hash, array, and scalar.

They are called mapping, sequence, and string respectively. By default, they do what you would expect. But each instance may have an explicit or implicit tag type that makes it behave differently. A YAML document is an independent data structure representation within a stream.

It is a top level node. Actually the header is optional on the first document. It consists of three dashes, possibly followed by more info. Another purpose of the header line is that it serves as a place to put top level tag and anchor information. A YAML node is the representation of a particular data structure.

Nodes may contain other nodes. In Perl terms, nodes are like scalars. Strings, arrayrefs and hashrefs. But this refers to the serialized format, not the in- memory structure. This is similar to a type. It indicates how a particular YAML node serialization should be transferred into or out of memory. A collection is the generic term for a YAML data grouping. YAML has two types of collections: mappings and sequences. Similar to hashes and arrays.

A sequence is a YAML collection defined by an ordered list of elements. A scalar is a YAML node that is a single value. YAML has many styles for representing scalars. This is important because varying data will have varying formatting requirements to retain the optimum human readability. A plain scalar is unquoted. All plain scalars are automatic candidates for "implicit tagging".

This means that their tag may be determined automatically by examination. The typical uses for this are plain alpha strings, integers, real numbers, dates, times and currency. This is similar to Perl's use of single quotes.

It means no escaping except for single quotes which are escaped by using two adjacent single quotes. This is a multiline scalar which begins on the next line.

It is indicated by a single right angle bracket. It is unescaped like the single quoted scalar. Line folding is also performed. This final multiline form is akin to Perl's here-document except that as in all YAML data scope is indicated by indentation.

Therefore, no ending marker is required. The data is verbatim. No line folding. The other half of the Load function is a loader.

This takes the information from the parser and loads it into a Perl data structure. The Dump function consists of a dumper and an emitter. The dumper walks through each Perl data structure and gives info to the emitter.

In the future they may be broken into separate stages. When you have successfully reproduced the bug, please mail the LOG file to the author ingy cpan. This version of YAML. In actuality there isn't a ton of difference, and this YAML. Things will get much better in the future. This is where the language is discussed and designed. For more information on module installation, please visit the detailed CPAN module installation guide.

If you really need to use this version of YAML. It ain't! YAML is really a data serialization language. But if you want to think of it as a markup, that's OK with me.

A lot of people try to use XML as a serialization format. Try it. If set to true, it will load the following YAML as objects: local:! Foo::Bar [a] perl:!! This ensures leading that things like leading zeros and other formatting are preserved. Sets the number of spaces for indentation for Dump. Fork metacpan. Keyboard Shortcuts. Global s Focus search bar? Bring up this help dialog GitHub g p Go to pull requests g i go to github issues only if github is preferred repository.

Search terms module: e. Just like Storable 's thaw function or the eval function in relation to Data::Dumper. Be sure to decode the character string correctly if the string came from a file or socket. For consistency with YAML. Aliases to Dump and Load for Storable fans.

It is based on and described comparatively to the YAML 1. The purpose of the YAML Tiny specification is to describe a useful subset of the YAML specification that can be used for typical document-oriented use cases such as configuration files and simple data structure dumps.

Many specification elements that add flexibility or extensibility are intentionally removed, as is support for complex data structures, class and object-orientation.

As a result, all possible YAML Tiny documents should be able to be transformed into an equivalent JSON document, although the reverse is not necessarily true but will be true in simple cases. YAML Tiny supports three data structures. These are scalars in a variety of forms , block-form sequences and block-form mappings.

Flow-style sequences and mappings are not supported, with some minor exceptions detailed later. Scalars are supported via the plain style, single quote and double quote, as well as literal-style and folded-style multi-line scalars. However, serializer implementations should take care to explicitly escape strings that match a "bool" keyword in the following set to prevent other implementations that do support "bool" accidentally reading a string as a boolean.

Any compliant parser is only required to parse a single document at a time. The ability to support streaming documents is optional and most likely non-typical. Because anchors and aliases are not supported, the resulting representation graph is thus directed but unlike the main YAML specification acyclic.

Operations on strings expect or produce Unicode characters not UTF-8 encoded bytes. YAML Tiny parsers and emitters are not expected to recover from, or adapt to, errors. The specific error modality of any implementation is not dictated return codes, exceptions, etc. Support for the "[" flow sequence indicator is not required, with one exception detailed below.

Support for the "]" flow sequence indicator is not required, with one exception detailed below. Other than the empty sequence and mapping cases described above, YAML Tiny supports only the indentation-based block-style group of contexts. Comments work as per the YAML specification in all simple cases. Support for indented multi-line comments is not required. Although detected, this directive will have no control over the parsing itself. The parser must recognise both the YAML 1.

If necessary, a document boundary should simply by indicated with a "" marker, with not preceding " Support for all five scalar styles is required as per the YAML specification, although support for quoted scalars spanning more than one line is not required. For some Perl applications, it's important to know if you really have a number and not a string. That is, in some contexts is important that 3 the number is distinctive from "3" the string.

Because even Perl itself is not trivially able to understand the difference certainly without XS-based modules Perl implementations of the YAML Tiny specification are not required to retain the distinctiveness of 3 vs "3". For more information on module installation, please visit the detailed CPAN module installation guide. Chat with us! Introduction and Goals 2. Introduction 3. It only supports a very basic subset of the full YAML specification.

Returns the object on success or throws an error on failure. Returns true on success or throws an error on failure. Starting with version 1.