Class: Xjson

Inherits:
Object
  • Object
show all
Defined in:
lib/xjson.rb

Overview

require ‘byebug’

Defined Under Namespace

Classes: XjsonIncludeError, XjsonReferenceError

Constant Summary collapse

VERSION = 
"0.0.1"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(xjson_file) ⇒ Xjson

Returns a new instance of Xjson.



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# File 'lib/xjson.rb', line 22

def initialize( xjson_file )
    @cur_file = []
    @cur_data = []
    @ext_data = {}
    @ext_data = read_json_file( xjson_file )
    @data = expand( @ext_data )
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/xjson.rb', line 19

def data
  @data
end

#dir ⇒ Object (readonly)

Returns the value of attribute dir.



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# File 'lib/xjson.rb', line 20

def dir
  @dir
end

#ext_data ⇒ Object (readonly)

Returns the value of attribute ext_data.



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# File 'lib/xjson.rb', line 18

def ext_data
  @ext_data
end

Class Method Details

.load(filename) ⇒ Object 



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# File 'lib/xjson.rb', line 14

def Xjson.load( filename )
    Marshal.load( File.read( filename ) )
end

.version ⇒ Object 



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# File 'lib/xjson.rb', line 10

def Xjson.version
    Xjson::VERSION
end

Instance Method Details

#dump(filename) ⇒ Object 



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# File 'lib/xjson.rb', line 264

def dump( filename )
    File.write( filename, Marshal.dump( @data ) )
end

#expand(data) ⇒ Object

Expand json recursively.



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# File 'lib/xjson.rb', line 153

def expand( data )

    case data

    when TrueClass; data

    when FalseClass; data

    when Float; data

    when Integer; data

    when String; data

    when Array;
        ret = []
        @cur_data.unshift ret
        data.each do |v|
            value = expand( v )
            ret.push( value ) if value
        end
        @cur_data.shift
        ret

    when Hash

        if data.size == 1

            # Most possible extension.

            k, v = data.first

            case k

            when "@eval"
                %x"#{expand(v)}".split("\n")

            when "@env"
                ENV[expand(v)]

            when "@join"
                flatten( v[1..-1].map{|i| expand( i )} ).join( v[0] )

            when "@flat"
                flatten( v[1..-1].map{|i| expand( i )} )

            when "@self"
                reference( @ext_data, expand(v) )

            when "@over";
                override( @cur_data[0], expand(v), true )
                nil

            when "@base";
                override( @cur_data[0], expand(v), false )
                nil

            when "@null"
                nil

            when "@include";
                jsonfile = expand(v)
                subdata = read_json_file( jsonfile )
                expdata = expand( subdata )
                if expdata.class == Hash
                    if @cur_data[0].class == expdata.class
                        expdata.each do |ke,ve|
                            @cur_data[0][ ke ] = ve
                        end
                    else
                        raise XjsonIncludeError,
                        "Included file (\"#{jsonfile}\") must contain a hash as top level"
                    end
                elsif expdata.class == Array
                    expdata.each do |ve|
                        @cur_data[0].push ve
                    end
                else
                    raise XjsonIncludeError,
                    "Included file (\"#{jsonfile}\") must contain a hash or a an array as top level"
                end
                @cur_file.shift
                nil

            else
                # Non-extension.
                { k => expand( v ) }

            end

        else
            ret = {}
            @cur_data.unshift ret
            data.each do |k,v|
                case k
                when "@null"; nil
                else
                    value = expand( v )
                    ret[ k ] = value if value
                end
            end
            @cur_data.shift
            ret
        end
    end
end

#find_in_array_of_hash(scope, key, value) ⇒ Object 



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# File 'lib/xjson.rb', line 57

def find_in_array_of_hash( scope, key, value )
    index = 0
    while index < scope.length
        if Regexp.new( value).match( scope[ index ][ key ] )
            return index
        end
        index += 1
    end
    nil
end

#flatten(data) ⇒ Object

Flatten by one level within array.



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# File 'lib/xjson.rb', line 40

def flatten( data )
    case data
    when Array;
        res = []
        data.each do |i|
            if i.class == Array
                res += i
            else
                res.push i
            end
        end
        res
    else
        data
    end
end

#override(data, exp, overwrite = false) ⇒ Object 



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# File 'lib/xjson.rb', line 146

def override( data, exp, overwrite = false )
    desc = override_desc( data, exp )
    override_apply( desc, overwrite )
end

#override_apply(desc, overwrite = false) ⇒ Object 



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# File 'lib/xjson.rb', line 131

def override_apply( desc, overwrite = false )
    if desc[:label] == "*"
        desc[:path].each do |place|
            if not( place[ desc[:value][0] ] ) || overwrite
                place[ desc[:value][0] ] = desc[:value][1]
            end
        end
    else
        if not( desc[:path][desc[:label]] ) || overwrite
            desc[:path][desc[:label]] = desc[:value]
        end
    end
end

#override_desc(data, exp) ⇒ Object 



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# File 'lib/xjson.rb', line 125

def override_desc( data, exp )
    path, label = reference_handle( data, exp[0] )
    { path: path, label: label, value: exp[1] }
end

#read_json_file(xjson_file) ⇒ Object 



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# File 'lib/xjson.rb', line 30

def read_json_file( xjson_file )
    @cur_file.unshift xjson_file
    if xjson_file[0] != "<"
        JSON.parse( File.read( xjson_file ) )
    else
        JSON.parse( STDIN.read )
    end
end

#reference(data, ref_desc) ⇒ Object 



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# File 'lib/xjson.rb', line 108

def reference( data, ref_desc )
    path, label = reference_handle( data, ref_desc )
    begin
        index = Integer( label )
        scope = path[ index ]
    rescue
        # scope = scope[ path[0] ]
        scope = path[ label ]
    end
    # scope = path[ label ]
    # if scope.class == String
        scope
    # else
    #     scope.to_s
    # end
end

#reference_handle(data, ref_desc) ⇒ Object 



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# File 'lib/xjson.rb', line 68

def reference_handle( data, ref_desc )
    if ref_desc[0] != ":"
        # [ data, ref_desc ]
        reference_handle( data, ":#{ref_desc}" )
    else
        # Relative reference from root.
        path = ref_desc.split( ":" )[1..-1]
        scope = data
        while path[0..-2].any?
            if path[0] == "*"
                # Wildcard for array.
                unless path[1] && path[2]
                    raise XjsonReferenceError,
                    "Invalid reference: \"#{ref_desc}\" in \"#{@cur_file[0]}\", missing match key and value ..."
                end
                index = find_in_array_of_hash( scope, path[1], path[2] )
                unless index
                    raise XjsonReferenceError,
                    "Invalid reference: \"#{ref_desc}\" in \"#{@cur_file[0]}\", key and value not matched ..."
                end
                scope = scope[ index ]
                path.shift( 2 )
            else
                begin
                    index = Integer( path[0] )
                    scope = scope[ index ]
                rescue
                    scope = scope[ path[0] ]
                end
            end
            path.shift
            unless scope
                raise XjsonReferenceError,
                "Invalid reference: \"#{ref_desc}\" in \"#{@cur_file[0]}\"..."
            end
        end
        [ scope, path[-1] ]
    end
end

#to_s ⇒ Object 



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# File 'lib/xjson.rb', line 260

def to_s
    JSON.pretty_generate( @data )
end