Plugin: yanlr

• infos = Information about the yanlr plugin is in keys below
• infos/author = René Schwaiger sanss.nosp@m.ecou.nosp@m.rs@me.nosp@m..com
• infos/licence = BSD
• infos/needs = directoryvalue yamlsmith
• infos/provides = storage/yaml
• infos/recommends =
• infos/placements = getstorage
• infos/status = maintained unittest preview experimental unfinished nodoc concept discouraged
• infos/metadata =
• infos/description = This storage plugin use a parser generated by ANTLR to read YAML files

Yan LR

Introduction

This plugin uses ANTLR to generate a parser for the YAML serialization format. Apart from the hand written lexer, all other parts of the plugin use standard ANTLR tools, such as

• an ANTLR parser grammar,
• a listener, that reacts to matches in the grammar building a key set, and
• an error listener that reacts to syntax errors

Examples

Mappings

`` <h1>Mount plugin to cascading namespace/tests/yanlr` sudo kdb mount config.yaml user/tests/yanlr yanlr

Manually add some mappings to the configuration file

printf 'all : circles presuppose
' > kdb file user/tests/yanlr printf 'hello : world
' >> kdb file user/tests/yanlr

kdb ls /tests/yanlr #> user/tests/yanlr/all #> user/tests/yanlr/hello

kdb get user/tests/yanlr/all #> circles presuppose

Add new key-value pairs

Yan LR actually uses the YAML Smith plugin to write data

kdb set /tests/yanlr/brand new kdb set /tests/yanlr/brand/new eyes kdb set /tests/yanlr/dance/gavin 'Dance!'

kdb ls /tests/yanlr #> user/tests/yanlr/all #> user/tests/yanlr/brand #> user/tests/yanlr/brand/new #> user/tests/yanlr/dance/gavin #> user/tests/yanlr/hello

kdb get /tests/yanlr/hello #> world kdb get user/tests/yanlr/brand #> new kdb get /tests/yanlr/dance/gavin #> Dance!

Undo modifications to the key database

kdb rm -r user/tests/yanlr sudo kdb umount user/tests/yanlr

### Arrays

Mount plugin to cascading namespace /tests/yanlr

sudo kdb mount config.yaml user/tests/yanlr yanlr

Manually add a sequences to the configuration file

printf 'primes:
' > kdb file user/tests/yanlr printf ' - two
' >> kdb file user/tests/yanlr printf ' - three
' >> kdb file user/tests/yanlr printf ' - five
' >> kdb file user/tests/yanlr

kdb ls user/tests/yanlr #> user/tests/yanlr/primes #> user/tests/yanlr/primes/#0 #> user/tests/yanlr/primes/#1 #> user/tests/yanlr/primes/#2

kdb set user/tests/yanlr/primes/#3 seven

Retrieve index of last array element

kdb getmeta user/tests/yanlr/primes array #> #3

Undo modifications to the key database

kdb rm -r user/tests/yanlr sudo kdb umount user/tests/yanlr ```

Limitations

• The plugin does not support
  • plain scalars that span multiple lines,
  • special characters inside double quoted scalars,
  • other line endings than \n (Unix line endings),
  • block scalars,
  • flow collections,
  • tags,
  • anchors & aliases,
  • multiple documents, and
  • document start and end markers
• Yan LR does not provide write support for data. Please use the YAML Smith plugin for that purpose.

Comments

The lexer does currently tokenize comments. Consequently the plugin grammar of the plugin does also match comments. However, the listener does currently ignore comments.