Class: Kwalify::Yaml::Parser

Inherits:
BaseParser show all
Defined in:
lib/kwalify/parser/yaml.rb

Overview

YAML parser with validator

ex.

schema = YAML.load_file('schema.yaml')
require 'kwalify'
validator = Kwalify::Validator.new(schema)
parser = Kwalify::Yaml::Parser.new(validator)  # validator is optional
#parser.preceding_alias = true  # optional
#parser.data_binding = true     # optional
ydoc = parser.parse_file('data.yaml')
errors = parser.errors
if errors && !errors.empty?
  errors.each do |e|
    puts "line=#{e.linenum}, path=#{e.path}, mesg=#{e.message}"
  end
end

Constant Summary collapse

MAPKEY_PATTERN =

:nodoc:

/([\w.][-\w.:]*\*?|".*?"|'.*?'|:\w+|=|<<)[ \t]*:\s+/
PRECEDING_ALIAS_PLACEHOLDER =

:nodoc:

Object.new

Constants inherited from BaseParser

BaseParser::CHAR_TABLE

Instance Attribute Summary collapse

Attributes inherited from BaseParser

#column, #filename, #linenum

Instance Method Summary collapse

Methods inherited from BaseParser

#_getch, #_set_column_and_linenum, #eos?, #group, #match?, #peep, #reset, #scan, #scan_string

Constructor Details

#initialize(validator = nil, properties = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/kwalify/parser/yaml.rb', line 46

def initialize(validator=nil, properties={})
  @validator = validator.is_a?(Hash) ? Kwalify::Validator.new(validator) : validator
  @data_binding    = properties[:data_binding]    # enable data binding or not
  @preceding_alias = properties[:preceding_alias] # allow preceding alias or not
  @sequence_class  = properties[:sequence_class] || Array
  @mapping_class   = properties[:mapping_class]  || Hash
end

Instance Attribute Details

#data_binding ⇒ Object

boolean



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# File 'lib/kwalify/parser/yaml.rb', line 54

def data_binding
  @data_binding
end

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



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# File 'lib/kwalify/parser/yaml.rb', line 68

def errors
  @errors
end

#mapping_class ⇒ Object

Class



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# File 'lib/kwalify/parser/yaml.rb', line 57

def mapping_class
  @mapping_class
end

#preceding_alias ⇒ Object

boolean



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# File 'lib/kwalify/parser/yaml.rb', line 55

def preceding_alias
  @preceding_alias
end

#sequence_class ⇒ Object

Class



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# File 'lib/kwalify/parser/yaml.rb', line 56

def sequence_class
  @sequence_class
end

#validator ⇒ Object

Validator



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# File 'lib/kwalify/parser/yaml.rb', line 53

def validator
  @validator
end

Instance Method Details

#_parse_map_value(map, map_rule, path, level, key, is_merged, uniq_table, _linenum, _column, _linenum2, _column2) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 335

def _parse_map_value(map, map_rule, path, level, key, is_merged, uniq_table,
                     _linenum, _column, _linenum2, _column2)  #:nodoc:
  key = to_mapkey(key)
  path[-1] = key
  #if map.is_a?(Hash) && map.key?(key) && !is_merged
  if map.respond_to?('key?') && map.key?(key) && !is_merged
    rule = map_rule.mapping[key]
    unless rule && rule.default
      raise _syntax_error("mapping key is duplicated.", path)
    end
  end
  #
  if key == '='      # default
    val = level ? parse_block_value(level, nil, path, uniq_table, map) \
                : parse_flow_value(nil, path, uniq_table, map)
    map.default = val
  elsif key == '<<'  # merge
    classobj = nil
    if map_rule && map_rule.classname
      map_rule = map_rule.dup()
      classobj = map_rule.classobj
      map_rule.classname = nil
      map_rule.classobj = nil
    end
    val = level ? parse_block_value(level, map_rule, path, uniq_table, map) \
                : parse_flow_value(map_rule, path, uniq_table, map)
    if val.is_a?(Array)
      val.each_with_index do |v, i|
        unless v.is_a?(Hash) || (classobj && val.is_a?(classobj))
          raise _syntax_error("'<<': mapping required.", path + [i])
        end
      end
      values = val
    elsif val.is_a?(Hash) || (classobj && val.is_a?(classobj))
      values = [val]
    else
      raise _syntax_error("'<<': mapping (or sequence of mapping) required.", path)
    end
    #
    values.each do |hash|
      if !hash.is_a?(Hash)
        assert_error "hash=#{hash.inspect}" unless classobj && hash.is_a?(classobj)
        obj = hash
        hash = {}
        obj.instance_variables.each do |name|
          key = name[1..-1]  # '@foo' => 'foo'
          val = obj.instane_variable_get(name)
          hash[key] = val
        end
      end
      for key, val in hash
        path[-1] = key                                                   #*V
        rule = map_rule ? map_rule.mapping[key] : nil                    #*V
        utable = uniq_table ? uniq_table[key] : nil                      #*V
        _validate_map_value(map, map_rule, rule, path, utable,           #*V
                         key, val, _linenum, _column)                    #*V
        put_to_map(rule, map, key, val, _linenum2, _column2)
      end
    end
    is_merged = true
  else               # other
    rule = map_rule ? map_rule.mapping[key] : nil                        #*V
    utable = uniq_table ? uniq_table[key] : nil                          #*V
    val = level ? parse_block_value(level, rule, path, utable, map) \
                : parse_flow_value(rule, path, utable, map)
    _validate_map_value(map, map_rule, rule, path, utable, key, val,     #*V
                     _linenum, _column)                                  #*V
    put_to_map(rule, map, key, val, _linenum2, _column2)
  end
  return is_merged
end

#_set_error_info(linenum = @linenum, column = @column, &block) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 90

def _set_error_info(linenum=@linenum, column=@column, &block)
  len = @errors.length
  yield
  n = @errors.length - len
  (1..n).each do |i|
    error = @errors[-i]
    error.linenum  ||= linenum
    error.column   ||= column
    error.filename ||= @filename
  end if n > 0
end

#_validate_map_value(map, map_rule, rule, path, uniq_table, key, val, _linenum, _column) ⇒ Object

*V



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# File 'lib/kwalify/parser/yaml.rb', line 408

def _validate_map_value(map, map_rule, rule, path, uniq_table, key, val, #*V
                     _linenum, _column)                                  #*V
  if map_rule && !rule                                                   #*V
    #_validate_error("unknown mapping key.", path)                       #*V
    _set_error_info(_linenum, _column) do                                #*V
      error = Kwalify::ErrorHelper.validate_error(:key_undefined,        #*V
                                    rule, path, map, ["#{key}:"])        #*V
      @errors << error                                                   #*V
      #error.linenum = _linenum                                          #*V
      #error.column  = _column                                           #*V
    end                                                                  #*V
  end                                                                    #*V
  _set_error_info(_linenum, _column) do                                  #*V
    @validator._validate(val, rule, path, @errors, @done, uniq_table, false)  #*V
  end if rule && !val.equal?(PRECEDING_ALIAS_PLACEHOLDER)                #*V
end

#document_start? ⇒ Boolean

Returns:



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# File 'lib/kwalify/parser/yaml.rb', line 112

def document_start?()
  return match?(/---\s/) && @column == 1
end

#has_next? ⇒ Boolean

Returns:



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# File 'lib/kwalify/parser/yaml.rb', line 122

def has_next?()
  return !(eos? || stream_end?)
end

#location(path) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 795

def location(path)
  if path.empty? || path == '/'
    return @location_table[-1]    # return value is [linenum, column]
  end
  if path.is_a?(Array)
    items = path.collect { |item| to_scalar(item) }
  elsif path.is_a?(String)
    items = path.split('/').collect { |item| to_scalar(item) }
    items.shift if path[0] == ?/  # delete empty string on head
  else
    raise ArgumentError.new("path should be Array or String.")
  end
  last_item = items.pop()
  c = @doc                        # collection
  items.each do |item|
    if c.is_a?(Array)
      c = c[item.to_i]
    elsif c.is_a?(Hash)
      c = c[item]
    elsif (table = @location_table[c.__id__]) && table[:classobj]
      if c.respond_to?(item)
        c = c.__send__(item)
      elsif c.respond_to?("[]=")
        c = c[item]
      else
        assert false
      end
    else
      #assert false
      raise ArgumentError.new("#{path.inspect}: invalid path.")
    end
  end
  collection = @location_table[c.__id__]
  return nil if collection.nil?
  index = c.is_a?(Array) ? last_item.to_i : last_item
  return collection[index]  # return value is [linenum, column]
end

#parse(input = nil, opts = {}) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 127

def parse(input=nil, opts={})
  reset_scanner(input, opts[:filename], opts[:untabify]) if input
  return parse_next()
end

#parse_alias(rule, path, uniq_table, container) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 198

def parse_alias(rule, path, uniq_table, container)
  name = group(1)
  if @anchors.key?(name)
    val = @anchors[name]
  elsif @preceding_alias
    @preceding_aliases << [name, rule, path.dup, container,
                           @linenum, @column - name.length - 1]
    val = PRECEDING_ALIAS_PLACEHOLDER
  else
    raise _syntax_error("*#{name}: anchor not found.", path,
                        @linenum, @column - name.length - 1)
  end
  skip_spaces_and_comments()
  return val
end

#parse_anchor(rule, path, uniq_table, container) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 187

def parse_anchor(rule, path, uniq_table, container)
  name = group(1)
  if @anchors.key?(name)
    raise _syntax_error("&#{name}: anchor duplicated.", path,
                        @linenum, @column - name.length)
  end
  skip_spaces_and_comments()
  return name
end

#parse_block_map(map, map_rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 426

def parse_block_map(map, map_rule, path, uniq_table)
  _start_linenum = @linenum                                              #*V
  _start_column  = @column                                               #*V
  level = @column
  path.push(nil)
  is_merged = false
  while true
    _linenum = @linenum                                                  #*V
    _column  = @column                                                   #*V
    break unless level == @column && scan(MAPKEY_PATTERN)
    key = group(1)
    skip_spaces_and_comments()                                           #*V
    _linenum2 = @linenum                                                 #*V
    _column2  = @column                                                  #*V
    is_merged = _parse_map_value(map, map_rule, path, level, key, is_merged,
                                 uniq_table, _linenum, _column, _linenum2, _column2)
    #skip_spaces_and_comments()
  end
  path.pop()
  _set_error_info(_start_linenum, _start_column) do                      #*V
    @validator._validate_mapping_required_keys(map, map_rule,            #*V
                                               path, @errors)            #*V
  end if map_rule                                                        #*V
  return map
end

#parse_block_scalar(rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 463

def parse_block_scalar(rule, path, uniq_table)
  _linenum = @linenum                                                    #*V
  _column  = @column                                                     #*V
  ch = peep(1)
  if ch == '"' || ch == "'"
    val = scan_string()
    scan(/[ \t]*(?:\#.*)?$/)
  else
    scan(/(.*?)[ \t]*(?:\#.*)?$/)
    #str.rstrip!
    val = to_scalar(group(1))
  end
  val = create_scalar(rule, val, _linenum, _column)                      #*V
  #_set_error_info(_linenum, _column) do                                 #*V
  #  @validator._validate_unique(val, rule, path, @errors, uniq_table)   #*V
  #end if uniq_table                                                     #*V
  skip_spaces_and_comments()
  return val
end

#parse_block_seq(seq, seq_rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 307

def parse_block_seq(seq, seq_rule, path, uniq_table)
  level = @column
  rule = seq_rule ? seq_rule.sequence[0] : nil
  path.push(nil)
  i = 0
  _linenum = @linenum                                                    #*V
  _column  = @column                                                     #*V
  uniq_table = rule ? rule._uniqueness_check_table() : nil               #*V
  while level == @column && scan(/-\s+/)
    path[-1] = i
    skip_spaces_and_comments()                                           #*V
    _linenum2 = @linenum
    _column2  = @column
    val = parse_block_value(level, rule, path, uniq_table, seq)
    add_to_seq(rule, seq, val, _linenum2, _column2)    # seq << val
    _set_error_info(_linenum, _column) do                                #*V
      @validator._validate(val, rule, path, @errors, @done, uniq_table, false) #*V
    end if rule && !val.equal?(PRECEDING_ALIAS_PLACEHOLDER)              #*V
    skip_spaces_and_comments()
    i += 1
    _linenum = @linenum                                                  #*V
    _column  = @column                                                   #*V
  end
  path.pop()
  return seq
end

#parse_block_text(column, rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 484

def parse_block_text(column, rule, path, uniq_table)
  _linenum = @linenum                                                    #*V
  _column  = @column                                                     #*V
  indicator = scan(/[|>]/)
  chomping = scan(/[-+]/)
  num = scan(/\d+/)
  indent = num ? column + num.to_i - 1 : nil
  unless scan(/[ \t]*(.*?)(\#.*)?\r?\n/)   # /[ \t]*(\#.*)?\r?\n/
    raise _syntax_error("Syntax Error (line break or comment are expected)", path)
  end
  s = group(1)
  is_folded = false
  while match?(/( *)(.*?)(\r?\n)/)
    spaces = group(1)
    text   = group(2)
    nl     = group(3)
    if indent.nil?
      if spaces.length >= column
        indent = spaces.length
      elsif text.empty?
        s << nl
        scan(/.*?\n/)
        next
      else
        @diagnostic = 'text indent in block text may be shorter than that of first line or specified column.'
        break
      end
    else
      if spaces.length < indent && !text.empty?
        @diagnostic = 'text indent in block text may be shorter than that of first line or specified column.'
        break
      end
    end
    scan(/.*?\n/)
    if indicator == '|'
      s << spaces[indent..-1] if spaces.length >= indent
      s << text << nl
    else  # indicator == '>'
      if !text.empty? && spaces.length == indent
        if s.sub!(/\r?\n((\r?\n)+)\z/, '\1')
          nil
        elsif is_folded
          s.sub!(/\r?\n\z/, ' ')
        end
        #s.sub!(/\r?\n\z/, '') if !s.sub!(/\r?\n(\r?\n)+\z/, '\1') && is_folded
        is_folded = true
      else
        is_folded = false
        s << spaces[indent..-1] if spaces.length > indent
      end
      s << text << nl
    end
  end
  ## chomping
  if chomping == '+'
    nil
  elsif chomping == '-'
    s.sub!(/(\r?\n)+\z/, '')
  else
    s.sub!(/(\r?\n)(\r?\n)+\z/, '\1')
  end
  #
  skip_spaces_and_comments()
  val = s
  #_set_error_info(_linenum, _column) do                                  #*V
  #  @validator._validate_unique(val, rule, path, @errors, uniq_table)    #*V
  #end if uniq_table                                                      #*V
  return val
end

#parse_block_value(level, rule, path, uniq_table, container) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 235

def parse_block_value(level, rule, path, uniq_table, container)
  skip_spaces_and_comments()
  ## nil
  return nil if @column <= level || eos?
  ## anchor and alias
  name = nil
  if scan(/\&([-\w]+)/)
    name = parse_anchor(rule, path, uniq_table, container)
  elsif scan(/\*([-\w]+)/)
    return parse_alias(rule, path, uniq_table, container)
  end
  ## type
  if scan(/!!?\w+/)
    skip_spaces_and_comments()
  end
  ## sequence
  if match?(/-\s+/)
    if rule && !rule.sequence
      #_validate_error("sequence is not expected.", path)
      rule = nil
    end
    seq = create_sequence(rule, @linenum, @column)
    @anchors[name] = seq if name
    parse_block_seq(seq, rule, path, uniq_table)
    return seq
  end
  ## mapping
  if match?(MAPKEY_PATTERN)
    if rule && !rule.mapping
      #_validate_error("mapping is not expected.", path)
      rule = nil
    end
    map = create_mapping(rule, @linenum, @column)
    @anchors[name] = map if name
    parse_block_map(map, rule, path, uniq_table)
    return map
  end
  ## sequence (flow-style)
  if match?(/\[/)
    if rule && !rule.sequence
      #_validate_error("sequence is not expected.", path)
      rule = nil
    end
    seq = create_sequence(rule, @linenum, @column)
    @anchors[name] = seq if name
    parse_flow_seq(seq, rule, path, uniq_table)
    return seq
  end
  ## mapping (flow-style)
  if match?(/\{/)
    if rule && !rule.mapping
      #_validate_error("mapping is not expected.", path)
      rule = nil
    end
    map = create_mapping(rule, @linenum, @column)
    @anchors[name] = map if name
    parse_flow_map(map, rule, path, uniq_table)
    return map
  end
  ## block text
  if match?(/[|>]/)
    text = parse_block_text(level, rule, path, uniq_table)
    @anchors[name] = text if name
    return text
  end
  ## scalar
  scalar = parse_block_scalar(rule, path, uniq_table)
  @anchors[name] = scalar if name
  return scalar
end

#parse_file(filename, opts = {}) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 133

def parse_file(filename, opts={})
  opts[:filename] = filename
  return parse(File.read(filename), opts)
end

#parse_flow_map(map, map_rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 634

def parse_flow_map(map, map_rule, path, uniq_table)
  #scan(/\{\s*/)  # not work?
  _start_linenum = @linenum                                              #*V
  _start_column  = @column                                               #*V
  scan(/\{/)
  skip_spaces_and_comments()
  if scan(/\}/)
    nil
  else
    path.push(nil)
    is_merged = false
    while true
      _linenum = @linenum                                                #*V
      _column  = @column                                                 #*V
      unless scan(MAPKEY_PATTERN)
        raise _syntax_error("mapping key is expected.", path)
      end
      key = group(1)
      skip_spaces_and_comments()
      _linenum2 = @linenum                                               #*V
      _column2  = @column                                                #*V
      is_merged = _parse_map_value(map, map_rule, path, nil, key, is_merged,
                         uniq_table, _linenum, _column, _linenum2, _column2)
      #skip_spaces_and_comments()
      break unless scan(/,\s+/)
    end
    path.pop()
    unless scan(/\}/)
      raise _syntax_error("flow mapping is not closed by '}'.", path)
    end
  end
  skip_spaces_and_comments()
  _set_error_info(_start_linenum, _start_column) do                      #*V
    @validator._validate_mapping_required_keys(map, map_rule, path, @errors)  #*V
  end if map_rule                                                        #*V
  return map
end

#parse_flow_scalar(rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 673

def parse_flow_scalar(rule, path, uniq_table)
  ch = peep(1)
  _linenum = @linenum                                                    #*V
  _column  = @column                                                     #*V
  if ch == '"' || ch == "'"
    val = scan_string()
  else
    str = scan(/[^,\]\}\#]*/)
    if match?(/,\S/)
      while match?(/,\S/)
        str << scan(/./)
        str << scan(/[^,\]\}\#]*/)
      end
    end
    str.rstrip!
    val = to_scalar(str)
  end
  val = create_scalar(rule, val, _linenum, _column)                      #*V
  #_set_error_info(_linenum, _column) do                                  #*V
  #  @validator._validate_unique(val, rule, path, @errors, uniq_table)    #*V
  #end if uniq_table                                                      #*V
  skip_spaces_and_comments()
  return val
end

#parse_flow_seq(seq, seq_rule, path, uniq_table) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 597

def parse_flow_seq(seq, seq_rule, path, uniq_table)
  #scan(/\[\s*/)
  scan(/\[/)
  skip_spaces_and_comments()
  if scan(/\]/)
    nil
  else
    rule = seq_rule ? seq_rule.sequence[0] : nil                         #*V
    uniq_table = rule ? rule._uniqueness_check_table() : nil             #*V
    path.push(nil)
    i = 0
    while true
      path[-1] = i
      _linenum = @linenum                                                #*V
      _column  = @column                                                 #*V
      val = parse_flow_value(rule, path, uniq_table, seq)
      add_to_seq(rule, seq, val, _linenum, _column)  # seq << val
      _set_error_info(_linenum, _column) do                              #*V
        @validator._validate(val, rule, path, @errors, @done, uniq_table, false)  #*V
      end if rule && !val.equal?(PRECEDING_ALIAS_PLACEHOLDER)            #*V
      skip_spaces_and_comments()
      break unless scan(/,\s+/)
      i += 1
      if match?(/\]/)
        raise _syntax_error("sequence item required (or last comma is extra).", path)
      end
    end
    path.pop()
    unless scan(/\]/)
      raise _syntax_error("flow sequence is not closed by ']'.", path)
    end
  end
  skip_spaces_and_comments()
  return seq
end

#parse_flow_value(rule, path, uniq_table, container) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 555

def parse_flow_value(rule, path, uniq_table, container)
  skip_spaces_and_comments()
  ## anchor and alias
  name = nil
  if scan(/\&([-\w]+)/)
    name = parse_anchor(rule, path, uniq_table, container)
  elsif scan(/\*([-\w]+)/)
    return parse_alias(rule, path, uniq_table, container)
  end
  ## type
  if scan(/!!?\w+/)
    skip_spaces_and_comments()
  end
  ## sequence
  if match?(/\[/)
    if rule && !rule.sequence                                            #*V
      #_validate_error("sequence is not expected.", path)                #*V
      rule = nil                                                         #*V
    end                                                                  #*V
    seq = create_sequence(rule, @linenum, @column)
    @anchors[name] = seq if name
    parse_flow_seq(seq, rule, path, uniq_table)
    return seq
  end
  ## mapping
  if match?(/\{/)
    if rule && !rule.mapping                                             #*V
      #_validate_error("mapping is not expected.", path)                 #*V
      rule = nil                                                         #*V
    end                                                                  #*V
    map = create_mapping(rule, @linenum, @column)
    @anchors[name] = map if name
    parse_flow_map(map, rule, path, uniq_table)
    return map
  end
  ## scalar
  scalar = parse_flow_scalar(rule, path, uniq_table)
  @anchors[name] = scalar if name
  return scalar
end

#parse_next ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 139

def parse_next()
  reset_parser()
  path = []
  skip_spaces_and_comments()
  if document_start?()
    scan(/.*\n/)
    skip_spaces_and_comments()
  end
  _linenum = @linenum                                                    #*V
  _column = @column                                                      #*V
  rule = @validator ? @validator.rule : nil                              #*V
  uniq_table = nil                                                       #*V
  parent = nil                                                           #*V
  val = parse_block_value(0, rule, path, uniq_table, parent)
  _set_error_info(_linenum, _column) do                                  #*V
    @validator._validate(val, rule, [], @errors, @done, uniq_table, false)  #*V
  end if rule                                                            #*V
  resolve_preceding_aliases(val) if @preceding_alias
  unless eos? || document_start?() || stream_end?()
    raise _syntax_error("document end expected (maybe invalid tab char found).", path)
  end
  @doc = val
  @location_table[-1] = [_linenum, _column]
  return val
end

#parse_stream(input, opts = {}, &block) ⇒ Object Also known as: parse_documents 



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# File 'lib/kwalify/parser/yaml.rb', line 166

def parse_stream(input, opts={}, &block)
  reset_scanner(input, opts[:filename], opts[:untabify])
  ydocs = block_given? ? nil : []
  while true
    ydoc = parse_next()
    ydocs ? (ydocs << ydoc) : (yield ydoc)
    break if eos? || stream_end?()
    document_start?() or raise "** internal error"
    scan(/.*\n/)
  end
  return ydocs
end

#reset_parser ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 60

def reset_parser()
  @anchors = {}
  @errors = []
  @done = {}
  @preceding_aliases = []
  @location_table = {}    # object_id -> sequence or mapping
  @doc = nil
end

#resolve_preceding_aliases(val) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 215

def resolve_preceding_aliases(val)
  @preceding_aliases.each do |name, rule, path, container, _linenum, _column|
    unless @anchors.key?(name)
      raise _syntax_error("*#{name}: anchor not found.", path, _linenum, _column)
    end
    key = path[-1]
    val = @anchors[name]
    raise unless !container.respond_to?('[]') || container[key].equal?(PRECEDING_ALIAS_PLACEHOLDER)
    if container.is_a?(Array)
      container[key] = val
    else
      put_to_map(rule, container, key, val, _linenum, _column)
    end
    _set_error_info(_linenum, _column) do                                #*V
      @validator._validate(val, rule, path, @errors, @done, false)       #*V
    end if rule                                                          #*V
  end
end

#set_errors_linenum(errors) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 834

def set_errors_linenum(errors)
  errors.each do |error|
    error.linenum, error.column = location(error.path)
  end
end

#skip_spaces_and_comments ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 103

def skip_spaces_and_comments()
  scan(/\s+/)
  while match?(/\#/)
    scan(/.*?\n/)
    scan(/\s+/)
  end
end

#stream_end? ⇒ Boolean

Returns:



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# File 'lib/kwalify/parser/yaml.rb', line 117

def stream_end?()
  return match?(/\.\.\.\s/) && @column == 1
end

#to_scalar(str) ⇒ Object 



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# File 'lib/kwalify/parser/yaml.rb', line 702

def to_scalar(str)
  case str
  when nil                ;  val = nil
  when /\A-?\d+\.\d+\z/   ;  val = str.to_f
  when /\A-?\d+\z/        ;  val = str.to_i
  when /\A(true|yes)\z/   ;  val = true
  when /\A(false|no)\z/   ;  val = false
  when /\A(null|~)\z/     ;  val = nil
  when /\A"(.*)"\z/       ;  val = $1
  when /\A'(.*)'\z/       ;  val = $1
  when /\A:(\w+)\z/       ;  val = $1.intern
  when /\A(\d\d\d\d)-(\d\d)-(\d\d)(?: (\d\d):(\d\d):(\d\d))?\z/
    year, month, day, hour, min, sec = $1, $2, $3, $4, $5, $6
    if hour
      val = Time.mktime(year, month, day, hour, min, sec)
    else
      val = Date.new(year.to_i, month.to_i, day.to_i)
    end
    ## or
    #params = [$1, $2, $3, $4, $5, $6]
    #val = Time.mktime(*params)
  else
    val = str.empty? ? nil : str
  end
  skip_spaces_and_comments()
  return val
end