Make variables subscriptable

[puetzp]

Since StrictYAML parses all literals as strings, variables fit into configuration files seamlessly without having to quote them:

number: 400
line: some string
variable: ${pullconf::some-variable}

Right now variables need to resolve to the same type that is expected from the parameter where the variable is found or resolve to a string if substring substitution is used inside another string parameter:

variables:
 ip: 192.168.0.200
 mode: 0600

resources:
 - type: host
 parameters:
 ip_address: ${pullconf::ip}
 hostname: ${pullconf::hostname}
 aliases:
 - me
 - myself
 - I
 - type: file
 parameters:
 path: /etc/ssh/sshd_config
 content: |
 ...
 Listen ${pullconf::ip}
 ...

It would be useful if variables were subscriptable in a way so values inside hash and array variables can be accessed:

variables:
 sshd:
 port: 22
 ip: 192.168.0.200

 - type: file
 parameters:
 path: /etc/ssh/sshd_config
 mode: ${pullconf::mode}
 content: |
 ...
 Listen ${pullconf::sshd.ip}
 Port ${pullconf::sshd.port}
 ...

The syntax for accessing values inside hashes and arrays could be:

• dots for accessing keys inside hashes
• numbers inside square brackets to access array elements

Making variables subscriptable allows users to organize their variables better.

Possible issues: Variables should still be able to contain other variables. Resolving variables thus becomes a little more complex.