Ruby 2.0.0 required

[jhmartin]

JMESPath 1.1.3 seems to require Ruby 2.0.0 for proper operation.

Under ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux] , I get:

RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:49:in `method_missing': unexpected token 0 (JMESPath::Errors::SyntaxError)
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:60:in `expr'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:145:in `led_comparator'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:62:in `expr'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:161:in `led_filter'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:62:in `expr'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:267:in `parse_multi_select_list'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:117:in `nud_lbracket'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:60:in `expr'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:212:in `led_pipe'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:62:in `expr'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/parser.rb:38:in `parse'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/caching_parser.rb:25:in `block in cache_expression'
    from <internal:prelude>:10:in `synchronize'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/caching_parser.rb:23:in `cache_expression'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/caching_parser.rb:16:in `parse'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath/runtime.rb:51:in `search'
    from RUBYROOT/ruby/gems/1.9.1/gems/jmespath-1.1.3/lib/jmespath.rb:33:in `search'
    from /tmp/a.rb:8:in `<main>'

Input:

{
    "failures": [],
    "services": [
        {
            "clusterArn": "arn:aws:ecs:us-east-1:3:cluster/QA",
            "deployments": [
                {
                    "createdAt": 1446670761.244,
                    "desiredCount": 1,
                    "id": "ecs-svc/9",
                    "pendingCount": 0,
                    "runningCount": 1,
                    "status": "PRIMARY",
                    "taskDefinition": "arn:aws:ecs:us-east-1:3:task-definition/foo:15",
                    "updatedAt": 2.244
                }
            ],
            "desiredCount": 1,
            "events": [
                {
                    "createdAt": 1.651,
                    "id": "0542993e-ab0e-x-86fa-55d544103377",
                    "message": "(service ) has reached a steady state."
                }
            ],
            "loadBalancers": [],
            "pendingCount": 0,
            "runningCount": 1,
            "serviceArn": "arn:aws:ecs:us-east-1:3:service/FOO",
            "serviceName": "FOO",
            "status": "ACTIVE",
            "taskDefinition": "arn:aws:ecs:us-east-1:3:task-definition/FOO:15"
        }
    ]
}

Script:

require 'jmespath'
require 'pp'

pp JMESPath.search('services[0] | [@[?length(deployments)!=`1`], @[?desiredCount!=runningCount]]', Pathname.new('/tmp/a'))

Under ruby 2.0.0p645 (2015-04-13 revision 50299) [x86_64-linux] I get:

[nil, nil]

[trevorrowe]

Thanks for reporting this issue. I've been able to reproduce it locally. It appears that the JSON.load method behaves different between Ruby 1.9.3 and 2.0.0+:

# ruby 2.0.0+
JSON.load("1")
#=> 1

# ruby 1.9.3
JSON.load("1")
#=> raises JSON::ParserError: A JSON text must at least contain two octets!

I'm going to have to see what alternatives there are in Ruby 1.9.3 for extracting JSON values from lexed strings.

[dmoskalik]

I'm using ruby version 1.87 and it seems like it does not work either. Does it really require ruby 1.9.3?
For me the problem is the splat operator in field.rb:
ChainedField.new([@keys, other.keys])
Any suggestions how to change it to be compatible with ruby 1.8.7?
I had to change also all
function(match:valid_keys)
to:
function({ :match => valid_keys})

[trevorrowe]

@dmoskalik I just pushed a fix for the Ruby 1.9.3 support. I can look at support 1.8.7, but I make no promises.