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|
#
# Output classes and methods
#
require 'yaml/constants'
require 'yaml/encoding'
require 'yaml/error'
module YAML
#
# Emit a set of values
#
class Emitter
attr_accessor :options
def initialize( opts )
opts = {} if opts.class != Hash
@options = YAML::DEFAULTS.dup.update( opts )
@headless = 0
@seq_map = false
@anchors = {}
@anchor_extras = {}
@active_anchors = []
@level = -1
self.clear
end
def clear
@buffer = []
end
#
# Version string
#
def version_s
" %YAML:#{@options[:Version]}" if @options[:UseVersion]
end
#
# Header
#
def header
if @headless.nonzero?
""
else
"---#{version_s} "
end
end
#
# Emit binary data
#
def binary_base64( value )
self << "!binary "
self.node_text( [value].pack("m"), '|' )
end
#
# Emit plain, normal flowing text
#
def node_text( value, block = '>' )
@seq_map = false
valx = value.dup
if @options[:UseBlock]
block = '|'
elsif not @options[:UseFold] and valx =~ /\n[ \t]/ and not valx =~ /#{YAML::ESCAPE_CHAR}/
block = '|'
end
str = block.dup
if valx =~ /\n\Z\n/
str << "+"
elsif valx =~ /\Z\n/
else
str << "-"
end
if valx =~ /#{YAML::ESCAPE_CHAR}/
valx = YAML::escape( valx )
end
if valx =~ /\A[ \t#]/
str << @options[:Indent].to_s
end
if block == '>'
valx = fold( valx )
end
self << str + indent_text( valx ) + "\n"
end
#
# Emit a simple, unqouted string
#
def simple( value )
@seq_map = false
self << value.to_s
end
#
# Emit double-quoted string
#
def double( value )
"\"#{YAML.escape( value )}\""
end
#
# Emit single-quoted string
#
def single( value )
"'#{value}'"
end
#
# Write a text block with the current indent
#
def indent_text( text )
return "" if text.to_s.empty?
spacing = " " * ( @level * @options[:Indent] )
return "\n" + text.gsub( /^([^\n])/, "#{spacing}\\1" )
end
#
# Write a current indent
#
def indent
#p [ self.id, @level, :INDENT ]
return " " * ( @level * @options[:Indent] )
end
#
# Add indent to the buffer
#
def indent!
self << indent
end
#
# Folding paragraphs within a column
#
def fold( value )
value.gsub!( /\A\n+/, '' )
folded = $&.to_s
width = (0..@options[:BestWidth])
while not value.empty?
last = value.index( /(\n+)/ )
chop_s = false
if width.include?( last )
last += $1.length - 1
elsif width.include?( value.length )
last = value.length
else
last = value.rindex( /[ \t]/, @options[:BestWidth] )
chop_s = true
end
folded += value.slice!( 0, width.include?( last ) ? last + 1 : @options[:BestWidth] )
folded.chop! if chop_s
folded += "\n" unless value.empty?
end
folded
end
#
# Quick mapping
#
def map( type, &e )
val = Mapping.new
e.call( val )
self << "#{type} " if type.length.nonzero?
#
# Empty hashes
#
if val.length.zero?
self << "{}"
@seq_map = false
else
if @buffer.length == 1 and @options[:UseHeader] == false and type.length.zero?
@headless = 1
end
defkey = @options.delete( :DefaultKey )
if defkey
seq_map_shortcut
self << "= : "
defkey.to_yaml( :Emitter => self )
end
#
# Emit the key and value
#
val.each { |v|
seq_map_shortcut
if v[0].is_complex_yaml?
self << "? "
end
v[0].to_yaml( :Emitter => self )
if v[0].is_complex_yaml?
self << "\n"
indent!
end
self << ": "
v[1].to_yaml( :Emitter => self )
}
end
end
def seq_map_shortcut
if @seq_map
@anchor_extras[@buffer.length - 1] = "\n" + indent
@seq_map = false
else
self << "\n"
indent!
end
end
#
# Quick sequence
#
def seq( type, &e )
@seq_map = false
val = Sequence.new
e.call( val )
self << "#{type} " if type.length.nonzero?
#
# Empty arrays
#
if val.length.zero?
self << "[]"
else
if @buffer.length == 1 and @options[:UseHeader] == false and type.length.zero?
@headless = 1
end
#
# Emit the key and value
#
val.each { |v|
self << "\n"
indent!
self << "- "
@seq_map = true if v.class == Hash
v.to_yaml( :Emitter => self )
}
end
end
#
# Concatenate to the buffer
#
def <<( str )
#p [ self.id, @level, str ]
@buffer.last << str
end
#
# Monitor objects and allow references
#
def start_object( oid )
@level += 1
@buffer.push( "" )
#p [ self.id, @level, :OPEN ]
idx = nil
if oid
if @anchors.has_key?( oid )
idx = @active_anchors.index( oid )
unless idx
idx = @active_anchors.length
af_str = "&#{@options[:AnchorFormat]} " % [ idx + 1 ]
af_str += @anchor_extras[ @anchors[ oid ] ].to_s
@buffer[ @anchors[ oid ] ][0,0] = af_str
@headless = 0 if @anchors[ oid ].zero?
end
idx += 1
@active_anchors.push( oid )
else
@anchors[ oid ] = @buffer.length - 1
end
end
return idx
end
#
# Output method
#
def end_object
@level -= 1
@buffer.push( "" )
#p [ self.id, @level, :END ]
if @level < 0
header + @buffer.to_s[@headless..-1].to_s
end
end
end
#
# Emitter helper classes
#
class Mapping < Array
def add( k, v )
push [k, v]
end
end
class Sequence < Array
def add( v )
push v
end
end
#
# Allocate an Emitter if needed
#
def YAML.quick_emit( oid, opts = {}, &e )
old_opt = nil
if opts[:Emitter].is_a? YAML::Emitter
out = opts.delete( :Emitter )
old_opt = out.options.dup
out.options.update( opts )
else
out = YAML::Emitter.new( opts )
end
aidx = out.start_object( oid )
if aidx
out.simple( "*#{out.options[:AnchorFormat]} " % [ aidx ] )
else
e.call( out )
end
if old_opt.is_a? Hash
out.options = old_opt
end
out.end_object
end
end
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