Class: JMESPath::Lexer Private

Inherits:
Object
  • Object
show all
Defined in:
lib/jmespath/lexer.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Defined Under Namespace

Classes: CharacterStream

Constant Summary collapse

T_DOT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:dot
T_STAR =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:star
T_COMMA =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:comma
T_COLON =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:colon
T_CURRENT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:current
T_EXPREF =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:expref
T_LPAREN =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:lparen
T_RPAREN =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:rparen
T_LBRACE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:lbrace
T_RBRACE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:rbrace
T_LBRACKET =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:lbracket
T_RBRACKET =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:rbracket
T_FLATTEN =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:flatten
T_IDENTIFIER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:identifier
T_NUMBER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:number
T_QUOTED_IDENTIFIER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:quoted_identifier
T_UNKNOWN =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:unknown
T_PIPE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:pipe
T_OR =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:or
T_AND =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:and
T_NOT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:not
T_FILTER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:filter
T_LITERAL =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:literal
T_EOF =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:eof
T_COMPARATOR =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

:comparator
STATE_IDENTIFIER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

0
STATE_NUMBER =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

1
STATE_SINGLE_CHAR =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

2
STATE_WHITESPACE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

3
STATE_STRING_LITERAL =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

4
STATE_QUOTED_STRING =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

5
STATE_JSON_LITERAL =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

6
STATE_LBRACKET =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

7
STATE_PIPE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

8
STATE_LT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

9
STATE_GT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

10
STATE_EQ =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

11
STATE_NOT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

12
STATE_AND =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

13
TRANSLATION_TABLE =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

{
  '<'  => STATE_LT,
  '>'  => STATE_GT,
  '='  => STATE_EQ,
  '!'  => STATE_NOT,
  '['  => STATE_LBRACKET,
  '|'  => STATE_PIPE,
  '&'  => STATE_AND,
  '`'  => STATE_JSON_LITERAL,
  '"'  => STATE_QUOTED_STRING,
  "'"  => STATE_STRING_LITERAL,
  '-'  => STATE_NUMBER,
  '0'  => STATE_NUMBER,
  '1'  => STATE_NUMBER,
  '2'  => STATE_NUMBER,
  '3'  => STATE_NUMBER,
  '4'  => STATE_NUMBER,
  '5'  => STATE_NUMBER,
  '6'  => STATE_NUMBER,
  '7'  => STATE_NUMBER,
  '8'  => STATE_NUMBER,
  '9'  => STATE_NUMBER,
  ' '  => STATE_WHITESPACE,
  "\t" => STATE_WHITESPACE,
  "\n" => STATE_WHITESPACE,
  "\r" => STATE_WHITESPACE,
  '.'  => STATE_SINGLE_CHAR,
  '*'  => STATE_SINGLE_CHAR,
  ']'  => STATE_SINGLE_CHAR,
  ','  => STATE_SINGLE_CHAR,
  ':'  => STATE_SINGLE_CHAR,
  '@'  => STATE_SINGLE_CHAR,
  '('  => STATE_SINGLE_CHAR,
  ')'  => STATE_SINGLE_CHAR,
  '{'  => STATE_SINGLE_CHAR,
  '}'  => STATE_SINGLE_CHAR,
  '_'  => STATE_IDENTIFIER,
  'A'  => STATE_IDENTIFIER,
  'B'  => STATE_IDENTIFIER,
  'C'  => STATE_IDENTIFIER,
  'D'  => STATE_IDENTIFIER,
  'E'  => STATE_IDENTIFIER,
  'F'  => STATE_IDENTIFIER,
  'G'  => STATE_IDENTIFIER,
  'H'  => STATE_IDENTIFIER,
  'I'  => STATE_IDENTIFIER,
  'J'  => STATE_IDENTIFIER,
  'K'  => STATE_IDENTIFIER,
  'L'  => STATE_IDENTIFIER,
  'M'  => STATE_IDENTIFIER,
  'N'  => STATE_IDENTIFIER,
  'O'  => STATE_IDENTIFIER,
  'P'  => STATE_IDENTIFIER,
  'Q'  => STATE_IDENTIFIER,
  'R'  => STATE_IDENTIFIER,
  'S'  => STATE_IDENTIFIER,
  'T'  => STATE_IDENTIFIER,
  'U'  => STATE_IDENTIFIER,
  'V'  => STATE_IDENTIFIER,
  'W'  => STATE_IDENTIFIER,
  'X'  => STATE_IDENTIFIER,
  'Y'  => STATE_IDENTIFIER,
  'Z'  => STATE_IDENTIFIER,
  'a'  => STATE_IDENTIFIER,
  'b'  => STATE_IDENTIFIER,
  'c'  => STATE_IDENTIFIER,
  'd'  => STATE_IDENTIFIER,
  'e'  => STATE_IDENTIFIER,
  'f'  => STATE_IDENTIFIER,
  'g'  => STATE_IDENTIFIER,
  'h'  => STATE_IDENTIFIER,
  'i'  => STATE_IDENTIFIER,
  'j'  => STATE_IDENTIFIER,
  'k'  => STATE_IDENTIFIER,
  'l'  => STATE_IDENTIFIER,
  'm'  => STATE_IDENTIFIER,
  'n'  => STATE_IDENTIFIER,
  'o'  => STATE_IDENTIFIER,
  'p'  => STATE_IDENTIFIER,
  'q'  => STATE_IDENTIFIER,
  'r'  => STATE_IDENTIFIER,
  's'  => STATE_IDENTIFIER,
  't'  => STATE_IDENTIFIER,
  'u'  => STATE_IDENTIFIER,
  'v'  => STATE_IDENTIFIER,
  'w'  => STATE_IDENTIFIER,
  'x'  => STATE_IDENTIFIER,
  'y'  => STATE_IDENTIFIER,
  'z'  => STATE_IDENTIFIER,
}
VALID_IDENTIFIERS =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Set.new(%w(
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
  a b c d e f g h i j k l m n o p q r s t u v w x y z
  _ 0 1 2 3 4 5 6 7 8 9
))
NUMBERS =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Set.new(%w(0 1 2 3 4 5 6 7 8 9))
SIMPLE_TOKENS =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

{
  '.' => T_DOT,
  '*' => T_STAR,
  ']' => T_RBRACKET,
  ',' => T_COMMA,
  ':' => T_COLON,
  '@' => T_CURRENT,
  '(' => T_LPAREN,
  ')' => T_RPAREN,
  '{' => T_LBRACE,
  '}' => T_RBRACE,
}

Instance Method Summary collapse

Instance Method Details

#tokenize(expression) ⇒ Array<Hash>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parameters:

Returns:

  • (Array<Hash>)

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# File 'lib/jmespath/lexer.rb', line 163

def tokenize(expression)

  tokens = []
  chars = CharacterStream.new(expression.chars.to_a)

  while chars.current
    case TRANSLATION_TABLE[chars.current]
    when nil
      tokens << Token.new(
        T_UNKNOWN,
        chars.current,
        chars.position
      )
      chars.next
    when STATE_SINGLE_CHAR
      # consume simple tokens like ".", ",", "@", etc.
      tokens << Token.new(
        SIMPLE_TOKENS[chars.current],
        chars.current,
        chars.position
      )
      chars.next
    when STATE_IDENTIFIER
      start = chars.position
      buffer = []
      begin
        buffer << chars.current
        chars.next
      end while VALID_IDENTIFIERS.include?(chars.current)
      tokens << Token.new(
        T_IDENTIFIER,
        buffer.join,
        start
      )
    when STATE_WHITESPACE
      # skip whitespace
      chars.next
    when STATE_LBRACKET
      # consume "[", "[?" and "[]"
      position = chars.position
      actual = chars.next
      if actual == ']'
        chars.next
        tokens << Token.new(T_FLATTEN, '[]', position)
      elsif actual == '?'
        chars.next
        tokens << Token.new(T_FILTER, '[?', position)
      else
        tokens << Token.new(T_LBRACKET, '[',  position)
      end
    when STATE_STRING_LITERAL
      # consume raw string literals
      t = inside(chars, "'", T_LITERAL)
      t.value = t.value.gsub("\\'", "'")
      tokens << t
    when STATE_PIPE
      # consume pipe and OR
      tokens << match_or(chars, '|', '|', T_OR, T_PIPE)
    when STATE_JSON_LITERAL
      # consume JSON literals
      token = inside(chars, '`', T_LITERAL)
      if token.type == T_LITERAL
        token.value = token.value.gsub('\\`', '`')
        token = parse_json(token)
      end
      tokens << token
    when STATE_NUMBER
      start = chars.position
      buffer = []
      begin
        buffer << chars.current
        chars.next
      end while NUMBERS.include?(chars.current)
      tokens << Token.new(
        T_NUMBER,
        buffer.join.to_i,
        start
      )
    when STATE_QUOTED_STRING
      # consume quoted identifiers
      token = inside(chars, '"', T_QUOTED_IDENTIFIER)
      if token.type == T_QUOTED_IDENTIFIER
        token.value = "\"#{token.value}\""
        token = parse_json(token, true)
      end
      tokens << token
    when STATE_EQ
      # consume equals
      tokens << match_or(chars, '=', '=', T_COMPARATOR, T_UNKNOWN)
    when STATE_AND
      tokens << match_or(chars, '&', '&', T_AND, T_EXPREF)
    when STATE_NOT
      # consume not equals
      tokens << match_or(chars, '!', '=', T_COMPARATOR, T_NOT);
    else
      # either '<' or '>'
      # consume less than and greater than
      tokens << match_or(chars, chars.current, '=', T_COMPARATOR, T_COMPARATOR)
    end
  end
  tokens << Token.new(T_EOF, nil, chars.position)
  tokens
end