Module: Yamlr::Reader::Builder

Defined in:
lib/yamlr/reader/builder.rb

Defined Under Namespace

Classes: RootNodeError

Class Method Summary collapse

Class Method Details

.add_to_list(lst, adr) ⇒ Object

list stores hsh addresses of lines, comments, etc.



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# File 'lib/yamlr/reader/builder.rb', line 222

def self.add_to_list(lst, adr)
  case adr.class.to_s
  when "String" then x = adr
  when "Array" then  x = adr.join(",")
  end
  lst[lst.length + 1] = x
end

.adr_obj(hsh, adr) ⇒ Object

returns the actual object at an address in tree



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# File 'lib/yamlr/reader/builder.rb', line 104

def self.adr_obj(hsh, adr)
  m = self.to_adr(adr)
  eval("hsh#{m.to_s}")
end

.adr_obj_to_array(hsh, adr) ⇒ Object

converts an object in tree to empty array



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# File 'lib/yamlr/reader/builder.rb', line 111

def self.adr_obj_to_array(hsh, adr)
  m = self.to_adr(adr)
  eval("hsh#{m.to_s} = []")
end

.arr_parse(las, adr, val, upd) ⇒ Object

sub-parses array message, and logic from update-method



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# File 'lib/yamlr/reader/builder.rb', line 74

def self.arr_parse(las, adr, val, upd)
  case upd
  when "eq" then self.array_val(las, val)
  when "lt" then self.array_val(las, val)
  when "gt" then self.array_new(las, adr, val)
  else; raise "error"
  end
end

.array_new(las, adr, val) ⇒ Object

new array in tree, provides logic for last modified object



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# File 'lib/yamlr/reader/builder.rb', line 152

def self.array_new(las, adr, val)
  case
  when las.is_a?(Array) && las.empty?
    x = [val]
    las = x
    adr << las.rindex(x)
  when las.is_a?(Array) && las.last.is_a?(String) && las.last.empty?
    x = [val]
    las[-1] = [val]
    adr << las.rindex(x)
  when las.is_a?(Array)
    x = [val]
    las << x
    adr << las.rindex(x)
  end
end

.array_val(las, val) ⇒ Object

add val to array in tree



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# File 'lib/yamlr/reader/builder.rb', line 184

def self.array_val(las, val)
  case
  # when x is a hash, it's already addressed
  when las.is_a?(Array)
    las << val
  else
    raise las.inspect
  end
end

.blank(lst) ⇒ Object

add blank to list



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# File 'lib/yamlr/reader/builder.rb', line 232

def self.blank(lst)
  self.add_to_list(lst, "#BLANK")
end

.build(hsh, phs) ⇒ Object

adds parsed_hash of line to hash



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# File 'lib/yamlr/reader/builder.rb', line 31

def self.build(hsh, phs)
  add = false
  upd = nil
  msg = phs[:msg]
  self.doc_new(hsh) if hsh.empty? && msg != "doc"
  val = phs[:val]
  lst = hsh[:lst]

  unless [:com, :mal, :bla].include?(msg)
    cur = self.cur(hsh)
    key = phs[:key]
    spc = phs[:spc]
    idt = phs[:opt][:indent]
    adr = hsh[:adr]
    idx = self.index(spc, idt)
    upd = self.update(adr, idx)
    las = self.adr_obj(hsh, hsh[:adr])
    add = true
  end

  case msg
  when :dcs then self.doc_start(hsh)
  when :dct then self.doc_term(hsh)
  when :hpr then self.hsh_pair(las, key, val)
  when :hky then self.hsh_key(las, adr, key)
  when :bla then self.blank(lst)
  when :arr
    raise RootNodeError if cur.is_a?(Hash) && !cur.empty? && spc == 0
    if las.is_a?(Hash) && las.empty?
      self.adr_obj_to_array(hsh, hsh[:adr])
      las = self.adr_obj(hsh, hsh[:adr])
    end
    self.arr_parse(las, adr, val, upd)
  when :com then self.comment(lst, val)
  when :mal then self.malformed(lst, val)
  end

  self.add_to_list(lst, adr) if add
end

.comment(lst, val) ⇒ Object

add comment to list



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# File 'lib/yamlr/reader/builder.rb', line 238

def self.comment(lst, val)
  lst[lst.length + 1] = "#COMMENT: #{val}"
end

.cur(hsh) ⇒ Object

current hash, returns array of “doc”



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# File 'lib/yamlr/reader/builder.rb', line 85

def self.cur(hsh)
  hsh[hsh.length - 2]
end

.doc_new(hsh) ⇒ Object

create keypair for new doc



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# File 'lib/yamlr/reader/builder.rb', line 141

def self.doc_new(hsh)
  hsh[:lst] ||= {}
  hsh[:adr] ||= []
  len = hsh.length - 1
  hsh[len] = {}
  hsh[:adr].clear
  hsh[:adr] << len
end

.doc_start(hsh) ⇒ Object

start document



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# File 'lib/yamlr/reader/builder.rb', line 171

def self.doc_start(hsh)
  self.doc_new(hsh)
  self.add_to_list(hsh[:lst], "#DOC_START")
end

.doc_term(hsh) ⇒ Object

document terminate



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# File 'lib/yamlr/reader/builder.rb', line 178

def self.doc_term(hsh)
  self.add_to_list(hsh[:lst], "#DOC_TERM")
end

.hsh_key(las, adr, key) ⇒ Object

add hashkey to tree



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# File 'lib/yamlr/reader/builder.rb', line 196

def self.hsh_key(las, adr, key)
  case
  when las.is_a?(Hash)
    las[key] = {}
  when las.is_a?(Array)
    x = {key => {}}
    las << x
    adr << las.rindex(x)
  end
  adr << key
end

.hsh_pair(las, key, val) ⇒ Object

add hashpair to tree



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# File 'lib/yamlr/reader/builder.rb', line 210

def self.hsh_pair(las, key, val)
  case
  when las.is_a?(Array)
    x = {key => val}
    las << x
  when las.is_a?(Hash)
    las[key] = val
  end
end

.index(spc, idt) ⇒ Object

calculates index based on spaces divided by indent unit



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# File 'lib/yamlr/reader/builder.rb', line 118

def self.index(spc, idt)
  ((spc % idt) != 0) ? 0 : spc / idt
end

.malformed(lst, val) ⇒ Object

add malformed to list



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# File 'lib/yamlr/reader/builder.rb', line 244

def self.malformed(lst, val)
  lst[lst.length + 1] = "#MALFORMED: #{val}"
end

.to_adr(adr) ⇒ Object

address array to string usable in eval on root node



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# File 'lib/yamlr/reader/builder.rb', line 91

def self.to_adr(adr)
  m = adr.map {|x|
    case
    when x.is_a?(Symbol) then "[:#{x}]"
    when x.is_a?(String) then "['#{x}']"
    when x.is_a?(Integer) then "[#{x}]"
    end
  }
  m.join
end

.update(adr, idx) ⇒ Object

if indentation less than before, jump up tree, remove extra indices



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# File 'lib/yamlr/reader/builder.rb', line 124

def self.update(adr, idx)
  ret =  nil
  len = (adr.length - 1)
  if idx < len
    # remove indices after current index
    adr.replace(adr[0..idx])
    ret = "lt"
  elsif idx == len
    ret = "eq"
  elsif idx > len
    ret = "gt"
  end
  ret
end