yaml(3tcl) YAML processing yaml(3tcl)
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NAME
yaml - YAML Format Encoder/Decoder
SYNOPSIS
package require Tcl 8.4
package require yaml ?0.4.1?
::yaml::yaml2dict ?options? txt
::yaml::yaml2huddle ?options? txt
::yaml::setOption ?options?
::yaml::dict2yaml dict ?indent? ?wordwrap?
::yaml::list2yaml list ?indent? ?wordwrap?
::yaml::huddle2yaml huddle ?indent? ?wordwrap?
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DESCRIPTION
The yaml package provides a simple Tcl-only library for parsing the
YAML http://www.yaml.org/ data exchange format as specified in
http://www.yaml.org/spec/1.1/.
The yaml package returns data as a Tcl dict. Either the dict package
or Tcl 8.5 is required for use.
COMMANDS
::yaml::yaml2dict ?options? txt
::yaml::yaml2huddle ?options? txt
Parse yaml formatted text txt into a Tcl dict/huddle and return
the value.
-file txt is a filename of YAML-stream.
-stream
txt is just a YAML-stream.
-types list
The list is a type list for the yaml-scalar types.(e.g.
!!str !!timestamp !!integer !!true ...)
-types {timestamp integer null true false}
In this case, if a string matched "timestamp", converted
to the TCL internal timestamp.(e.g.
"2001-12-15T02:59:43.1Z" => 1008385183)
-m:true param
The param is two elements of list for the value of true,
and considered strings.
-m:true {1 {true on + yes y}}
In this case, the string "yes" found in YAML Stream, au-
tomatically converted 1.
-m:false param
The param is two elements of list for the value of false,
and considered strings.
-m:false {0 {false off - no n}}
-m:null param
The param is two elements of list for the value of null,
and considered strings.
-m:null {"" {null nil "" ~}}
-validate
Experiment,old: Output stream contains YAML's-tag, each
node.
% puts [::yaml::load -validate {[aaa, bbb]}]
=>
!!seq {{!!str aaa} {!!str bbb}}
::yaml::setOption ?options?
Change implicit options for the library. Now, the params are
the same as ::yaml::yaml2dict. Arguments of::yaml::yaml2dict is
more priority than this setting.
::yaml::dict2yaml dict ?indent? ?wordwrap?
::yaml::list2yaml list ?indent? ?wordwrap?
::yaml::huddle2yaml huddle ?indent? ?wordwrap?
Convert a dict/list/huddle object into YAML stream.
indent spaces indent of each block node. currently default is
2.
wordwrap
word wrap for YAML stream. currently default is 40.
EXAMPLES
An example of a yaml stream converted to Tcl. A yaml stream is re-
turned as a single item with multiple elements.
{
--- !<tag:clarkevans.com,2002:invoice>
invoice: 34843
date : 2001-01-23
bill-to: &id001
given : Chris
family : Dumars
address:
lines: |
458 Walkman Dr.
Suite #292
city : Royal Oak
state : MI
postal : 48046
ship-to: *id001
product:
- sku : BL394D
quantity : 4
description : Basketball
price : 450.00
- sku : BL4438H
quantity : 1
description : Super Hoop
price : 2392.00
tax : 251.42
total: 4443.52
comments:
Late afternoon is best.
Backup contact is Nancy
Billsmer @ 338-4338.
}
=>
invoice 34843 date 2001-01-23 bill-to {given Chris family Dumars address {lines {458 Walkman Dr.
Suite #292
} city {Royal Oak} state MI postal 48046}} ship-to {given Chris family Dumars address {lines {458 Walkman Dr.
Suite #292
} city {Royal Oak} state MI postal 48046}} product {{sku BL394D quantity 4 description Basketball price 450.00} {sku BL4438H quantity 1 description {Super Hoop} price 2392.00}} tax 251.42 total 4443.52 comments {Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338.}
An example of a yaml object converted to Tcl. A yaml object is re-
turned as a multi-element list (a dict).
{
---
- [name , hr, avg ]
- [Mark McGwire, 65, 0.278]
- [Sammy Sosa , 63, 0.288]
-
Mark McGwire: {hr: 65, avg: 0.278}
Sammy Sosa: { hr: 63, avg: 0.288}
}
=>
{name hr avg} {{Mark McGwire} 65 0.278} {{Sammy Sosa} 63 0.288} {{Mark McGwire} {hr 65 avg 0.278} {Sammy Sosa} {hr 63 avg 0.288}}
LIMITATIONS
tag parser not implemented. currentry, tags are merely ignored.
Only Anchor => Aliases ordering. back alias-referring is not supported.
Too many braces, or too few braces.
Not enough character set of line feeds. Please use only "\n" as line
breaks.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain
bugs and other problems. Please report such in the category yaml of
the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please
also report any ideas for enhancements you may have for either package
and/or documentation.
When proposing code changes, please provide unified diffs, i.e the out-
put of diff -u.
Note further that attachments are strongly preferred over inlined
patches. Attachments can be made by going to the Edit form of the
ticket immediately after its creation, and then using the left-most
button in the secondary navigation bar.
SEE ALSO
base64, huddle, json
KEYWORDS
data exchange, huddle, parsing, text processing, yaml
COPYRIGHT
Copyright (c) 2008 KATO Kanryu <kanryu6@users.sourceforge.net>
tcllib 0.4.1 yaml(3tcl)