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Edit File : dbm.rb \| Size : 6.76 KB
require 'yaml' require 'dbm' module YAML # YAML + DBM = YDBM # # YAML::DBM provides the same interface as ::DBM. # # However, while DBM only allows strings for both keys and values, # this library allows one to use most Ruby objects for values # by first converting them to YAML. Keys must be strings. # # Conversion to and from YAML is performed automatically. # # See the documentation for ::DBM and ::YAML for more information. class DBM < ::DBM VERSION = "0.1" # :nodoc: # :call-seq: # ydbm[key] -> value # # Return value associated with +key+ from database. # # Returns +nil+ if there is no such +key+. # # See #fetch for more information. def []( key ) fetch( key ) end # :call-seq: # ydbm[key] = value # # Set +key+ to +value+ in database. # # +value+ will be converted to YAML before storage. # # See #store for more information. def []=( key, val ) store( key, val ) end # :call-seq: # ydbm.fetch( key, ifnone = nil ) # ydbm.fetch( key ) { \|key\| ... } # # Return value associated with +key+. # # If there is no value for +key+ and no block is given, returns +ifnone+. # # Otherwise, calls block passing in the given +key+. # # See ::DBM#fetch for more information. def fetch( keystr, ifnone = nil ) begin val = super( keystr ) return YAML.load( val ) if String === val rescue IndexError end if block_given? yield keystr else ifnone end end # Deprecated, used YAML::DBM#key instead. # ---- # Note: # YAML::DBM#index makes warning from internal of ::DBM#index. # It says 'DBM#index is deprecated; use DBM#key', but DBM#key # behaves not same as DBM#index. # def index( keystr ) super( keystr.to_yaml ) end # :call-seq: # ydbm.key(value) -> string # # Returns the key for the specified value. def key( keystr ) invert[keystr] end # :call-seq: # ydbm.values_at(keys) # # Returns an array containing the values associated with the given keys. def values_at( keys ) keys.collect { \|k\| fetch( k ) } end # :call-seq: # ydbm.delete(key) # # Deletes value from database associated with +key+. # # Returns value or +nil+. def delete( key ) v = super( key ) if String === v v = YAML.load( v ) end v end # :call-seq: # ydbm.delete_if { \|key, value\| ... } # # Calls the given block once for each +key+, +value+ pair in the database. # Deletes all entries for which the block returns true. # # Returns +self+. def delete_if # :yields: [key, value] del_keys = keys.dup del_keys.delete_if { \|k\| yield( k, fetch( k ) ) == false } del_keys.each { \|k\| delete( k ) } self end # :call-seq: # ydbm.reject { \|key, value\| ... } # # Converts the contents of the database to an in-memory Hash, then calls # Hash#reject with the specified code block, returning a new Hash. def reject hsh = self.to_hash hsh.reject { \|k,v\| yield k, v } end # :call-seq: # ydbm.each_pair { \|key, value\| ... } # # Calls the given block once for each +key+, +value+ pair in the database. # # Returns +self+. def each_pair # :yields: [key, value] keys.each { \|k\| yield k, fetch( k ) } self end # :call-seq: # ydbm.each_value { \|value\| ... } # # Calls the given block for each value in database. # # Returns +self+. def each_value # :yields: value super { \|v\| yield YAML.load( v ) } self end # :call-seq: # ydbm.values # # Returns an array of values from the database. def values super.collect { \|v\| YAML.load( v ) } end # :call-seq: # ydbm.has_value?(value) # # Returns true if specified +value+ is found in the database. def has_value?( val ) each_value { \|v\| return true if v == val } return false end # :call-seq: # ydbm.invert -> hash # # Returns a Hash (not a DBM database) created by using each value in the # database as a key, with the corresponding key as its value. # # Note that all values in the hash will be Strings, but the keys will be # actual objects. def invert h = {} keys.each { \|k\| h[ self.fetch( k ) ] = k } h end # :call-seq: # ydbm.replace(hash) -> ydbm # # Replaces the contents of the database with the contents of the specified # object. Takes any object which implements the each_pair method, including # Hash and DBM objects. def replace( hsh ) clear update( hsh ) end # :call-seq: # ydbm.shift -> [key, value] # # Removes a [key, value] pair from the database, and returns it. # If the database is empty, returns +nil+. # # The order in which values are removed/returned is not guaranteed. def shift a = super a[1] = YAML.load( a[1] ) if a a end # :call-seq: # ydbm.select { \|key, value\| ... } # ydbm.select(keys) # # If a block is provided, returns a new array containing [key, value] pairs # for which the block returns true. # # Otherwise, same as #values_at def select( keys ) if block_given? self.keys.collect { \|k\| v = self[k]; [k, v] if yield k, v }.compact else values_at( *keys ) end end # :call-seq: # ydbm.store(key, value) -> value # # Stores +value+ in database with +key+ as the index. +value+ is converted # to YAML before being stored. # # Returns +value+ def store( key, val ) super( key, val.to_yaml ) val end # :call-seq: # ydbm.update(hash) -> ydbm # # Updates the database with multiple values from the specified object. # Takes any object which implements the each_pair method, including # Hash and DBM objects. # # Returns +self+. def update( hsh ) hsh.each_pair do \|k,v\| self.store( k, v ) end self end # :call-seq: # ydbm.to_a -> array # # Converts the contents of the database to an array of [key, value] arrays, # and returns it. def to_a a = [] keys.each { \|k\| a.push [ k, self.fetch( k ) ] } a end # :call-seq: # ydbm.to_hash -> hash # # Converts the contents of the database to an in-memory Hash object, and # returns it. def to_hash h = {} keys.each { \|k\| h[ k ] = self.fetch( k ) } h end alias :each :each_pair end end Back

Edit File : dbm.rb | Size : 6.76 KB

require 'yaml'
require 'dbm'

module YAML

# YAML + DBM = YDBM
#
# YAML::DBM provides the same interface as ::DBM.
#
# However, while DBM only allows strings for both keys and values,
# this library allows one to use most Ruby objects for values
# by first converting them to YAML. Keys must be strings.
#
# Conversion to and from YAML is performed automatically.
#
# See the documentation for ::DBM and ::YAML for more information.
class DBM < ::DBM
    VERSION = "0.1" # :nodoc:

# :call-seq:
    #   ydbm[key] -> value
    #
    # Return value associated with +key+ from database.
    #
    # Returns +nil+ if there is no such +key+.
    #
    # See #fetch for more information.
    def []( key )
        fetch( key )
    end

# :call-seq:
    #   ydbm[key] = value
    #
    # Set +key+ to +value+ in database.
    #
    # +value+ will be converted to YAML before storage.
    #
    # See #store for more information.
    def []=( key, val )
        store( key, val )
    end

# :call-seq:
    #   ydbm.fetch( key, ifnone = nil )
    #   ydbm.fetch( key ) { |key| ... }
    #
    # Return value associated with +key+.
    #
    # If there is no value for +key+ and no block is given, returns +ifnone+.
    #
    # Otherwise, calls block passing in the given +key+.
    #
    # See ::DBM#fetch for more information.
    def fetch( keystr, ifnone = nil )
        begin
            val = super( keystr )
            return YAML.load( val ) if String === val
        rescue IndexError
        end
        if block_given?
            yield keystr
        else
            ifnone
        end
    end

# Deprecated, used YAML::DBM#key instead.
    # ----
    # Note:
    # YAML::DBM#index makes warning from internal of ::DBM#index.
    # It says 'DBM#index is deprecated; use DBM#key', but DBM#key
    # behaves not same as DBM#index.
    #
    def index( keystr )
        super( keystr.to_yaml )
    end

# :call-seq:
    #   ydbm.key(value) -> string
    #
    # Returns the key for the specified value.
    def key( keystr )
        invert[keystr]
    end

# :call-seq:
    #   ydbm.values_at(*keys)
    #
    # Returns an array containing the values associated with the given keys.
    def values_at( *keys )
        keys.collect { |k| fetch( k ) }
    end

# :call-seq:
    #   ydbm.delete(key)
    #
    # Deletes value from database associated with +key+.
    #
    # Returns value or +nil+.
    def delete( key )
        v = super( key )
        if String === v
            v = YAML.load( v )
        end
        v
    end

# :call-seq:
    #   ydbm.delete_if { |key, value| ... }
    #
    # Calls the given block once for each +key+, +value+ pair in the database.
    # Deletes all entries for which the block returns true.
    #
    # Returns +self+.
    def delete_if # :yields: [key, value]
        del_keys = keys.dup
        del_keys.delete_if { |k| yield( k, fetch( k ) ) == false }
        del_keys.each { |k| delete( k ) }
        self
    end

# :call-seq:
    #   ydbm.reject { |key, value| ... }
    #
    # Converts the contents of the database to an in-memory Hash, then calls
    # Hash#reject with the specified code block, returning a new Hash.
    def reject
        hsh = self.to_hash
        hsh.reject { |k,v| yield k, v }
    end

# :call-seq:
    #   ydbm.each_pair { |key, value| ... }
    #
    # Calls the given block once for each +key+, +value+ pair in the database.
    #
    # Returns +self+.
    def each_pair # :yields: [key, value]
        keys.each { |k| yield k, fetch( k ) }
        self
    end

# :call-seq:
    #   ydbm.each_value { |value| ... }
    #
    # Calls the given block for each value in database.
    #
    # Returns +self+.
    def each_value # :yields: value
        super { |v| yield YAML.load( v ) }
        self
    end

# :call-seq:
    #   ydbm.values
    #
    # Returns an array of values from the database.
    def values
        super.collect { |v| YAML.load( v ) }
    end

# :call-seq:
    #   ydbm.has_value?(value)
    #
    # Returns true if specified +value+ is found in the database.
    def has_value?( val )
        each_value { |v| return true if v == val }
        return false
    end

# :call-seq:
    #   ydbm.invert -> hash
    #
    # Returns a Hash (not a DBM database) created by using each value in the
    # database as a key, with the corresponding key as its value.
    #
    # Note that all values in the hash will be Strings, but the keys will be
    # actual objects.
    def invert
        h = {}
        keys.each { |k| h[ self.fetch( k ) ] = k }
        h
    end

# :call-seq:
    #   ydbm.replace(hash) -> ydbm
    #
    # Replaces the contents of the database with the contents of the specified
    # object. Takes any object which implements the each_pair method, including
    # Hash and DBM objects.
    def replace( hsh )
        clear
        update( hsh )
    end

# :call-seq:
    #   ydbm.shift -> [key, value]
    #
    # Removes a [key, value] pair from the database, and returns it.
    # If the database is empty, returns +nil+.
    #
    # The order in which values are removed/returned is not guaranteed.
    def shift
        a = super
        a[1] = YAML.load( a[1] ) if a
        a
    end

# :call-seq:
    #   ydbm.select { |key, value| ... }
    #   ydbm.select(*keys)
    #
    # If a block is provided, returns a new array containing [key, value] pairs
    # for which the block returns true.
    #
    # Otherwise, same as #values_at
    def select( *keys )
        if block_given?
            self.keys.collect { |k| v = self[k]; [k, v] if yield k, v }.compact
        else
            values_at( *keys )
        end
    end

# :call-seq:
    #   ydbm.store(key, value) -> value
    #
    # Stores +value+ in database with +key+ as the index. +value+ is converted
    # to YAML before being stored.
    #
    # Returns +value+
    def store( key, val )
        super( key, val.to_yaml )
        val
    end

# :call-seq:
    #   ydbm.update(hash) -> ydbm
    #
    # Updates the database with multiple values from the specified object.
    # Takes any object which implements the each_pair method, including
    # Hash and DBM objects.
    #
    # Returns +self+.
    def update( hsh )
        hsh.each_pair do |k,v|
            self.store( k, v )
        end
        self
    end

# :call-seq:
    #   ydbm.to_a -> array
    #
    # Converts the contents of the database to an array of [key, value] arrays,
    # and returns it.
    def to_a
        a = []
        keys.each { |k| a.push [ k, self.fetch( k ) ] }
        a
    end

# :call-seq:
    #   ydbm.to_hash -> hash
    #
    # Converts the contents of the database to an in-memory Hash object, and
    # returns it.
    def to_hash
        h = {}
        keys.each { |k| h[ k ] = self.fetch( k ) }
        h
    end

alias :each :each_pair
end

end

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