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|
#
# BaseEmitter
#
require 'yaml/constants'
require 'yaml/encoding'
require 'yaml/error'
module YAML
module BaseEmitter
def options( opt = nil )
if opt
@options[opt] || YAML::DEFAULTS[opt]
else
@options
end
end
def options=( opt )
@options = opt
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
# FIXME
# 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
# FIXME: seq_map needs to work with the new anchoring system
# 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
# FIXME
# 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
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
end
|
