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|
#
# YAML::BaseNode class
#
require 'yaml/ypath'
module YAML
#
# YAML Generic Model container
#
module BaseNode
#
# Search for YPath entry and return
# qualified nodes.
#
def select( ypath_str )
matches = match_path( ypath_str )
#
# Create a new generic view of the elements selected
#
if matches
result = []
matches.each { |m|
result.push m.last
}
YAML.transfer( 'seq', result )
end
end
#
# Search for YPath entry and return
# transformed nodes.
#
def select!( ypath_str )
matches = match_path( ypath_str )
#
# Create a new generic view of the elements selected
#
if matches
result = []
matches.each { |m|
result.push m.last.transform
}
result
end
end
#
# Search for YPath entry and return a list of
# qualified paths.
#
def search( ypath_str )
matches = match_path( ypath_str )
if matches
matches.collect { |m|
path = []
m.each_index { |i|
path.push m[i] if ( i % 2 ).zero?
}
"/" + path.compact.join( "/" )
}
end
end
def at( seg )
if Hash === @value and @value.has_key?( seg )
@value[seg][1]
elsif Array === @value and seg =~ /\A\d+\Z/ and @value[seg.to_i]
@value[seg.to_i]
end
end
#
# YPath search returning a complete depth array
#
def match_path( ypath_str )
depth = 0
matches = []
YPath.each_path( ypath_str ) do |ypath|
seg = match_segment( ypath, 0 )
matches += seg if seg
end
matches.uniq
end
#
# Search a node for a single YPath segment
#
def match_segment( ypath, depth )
deep_nodes = []
seg = ypath.segments[ depth ]
if seg == "/"
unless String === @value
idx = -1
@value.collect { |v|
idx += 1
if Hash === @value
match_init = [v[0], v[1][1]]
match_deep = v[1][1].match_segment( ypath, depth )
else
match_init = [idx, v]
match_deep = v.match_segment( ypath, depth )
end
if match_deep
match_deep.each { |m|
deep_nodes.push( match_init + m )
}
end
}
end
depth += 1
seg = ypath.segments[ depth ]
end
match_nodes =
case seg
when "."
[[nil, self]]
when ".."
[["..", nil]]
when "*"
if @value.is_a? Enumerable
idx = -1
@value.collect { |h|
idx += 1
if Hash === @value
[h[0], h[1][1]]
else
[idx, h]
end
}
end
else
if seg =~ /^"(.*)"$/
seg = $1
elsif seg =~ /^'(.*)'$/
seg = $1
end
if ( v = at( seg ) )
[[ seg, v ]]
end
end
return deep_nodes unless match_nodes
pred = ypath.predicates[ depth ]
if pred
case pred
when /^\.=/
pred = $'
match_nodes.reject! { |n|
n.last.value != pred
}
else
match_nodes.reject! { |n|
n.last.at( pred ).nil?
}
end
end
return match_nodes + deep_nodes unless ypath.segments.length > depth + 1
#puts "DEPTH: #{depth + 1}"
deep_nodes = []
match_nodes.each { |n|
if n[1].is_a? BaseNode
match_deep = n[1].match_segment( ypath, depth + 1 )
if match_deep
match_deep.each { |m|
deep_nodes.push( n + m )
}
end
else
deep_nodes = []
end
}
deep_nodes = nil if deep_nodes.length == 0
deep_nodes
end
#
# We want the node to act like as Hash
# if it is.
#
def []( *k )
if Hash === @value
v = @value.[]( *k )
v[1] if v
elsif Array === @value
@value.[]( *k )
end
end
def children
if Hash === @value
@value.values.collect { |c| c[1] }
elsif Array === @value
@value
end
end
def children_with_index
if Hash === @value
@value.keys.collect { |i| [self[i], i] }
elsif Array === @value
i = -1; @value.collect { |v| i += 1; [v, i] }
end
end
def emit
transform.to_yaml
end
end
end
|
