Class: Code::Parser

Inherits:
Object show all
Defined in:
lib/code/parser.rb

Defined Under Namespace

Classes: Error, Language, Token

Constant Summary collapse

KEYWORDS = 
%w[
  and
  begin
  do
  else
  elsif
  elsunless
  end
  false
  if
  loop
  not
  nothing
  or
  rescue
  true
  unless
  until
  while
].freeze
MULTI_CHAR_OPERATORS = 
[
  "&.",
  "&&",
  "&&=",
  "**",
  "*=",
  "+=",
  "-=",
  "..",
  "...",
  "/=",
  "::",
  "<<=",
  "<<",
  "<=>",
  "<=",
  "===",
  "==",
  "=~",
  ">=",
  ">>=",
  ">>",
  "||=",
  "||",
  "|=",
  "!==",
  "!=",
  "!~",
  "%=",
  "^=",
  "=>"
].sort_by(&:length).reverse.freeze
CONTINUATION_KEYWORDS = 
%w[or and rescue].freeze
POSTFIX_CONTINUATIONS = 
%w[. :: &.].freeze
HORIZONTAL_WHITESPACE = 
[" ", "\t"].freeze
NEWLINE_CHARACTERS = 
["\n", "\r"].freeze
PUNCTUATION_CHARACTERS = 
%w[( ) [ ] { } , ? :].freeze
OPERATOR_CHARACTERS = 
%w[. & | = ! ~ + - * / % < > ^ × ÷].freeze
SUFFIX_PUNCTUATION = 
%w[! ?].freeze
ASSIGNMENT_RHS_MIN_BP = 
20
INFIX_PRECEDENCE = 
{
  "if" => [10, 9],
  "unless" => [10, 9],
  "while" => [10, 9],
  "until" => [10, 9],
  "or" => [20, 21],
  "=" => [30, 29],
  "+=" => [30, 29],
  "-=" => [30, 29],
  "*=" => [30, 29],
  "/=" => [30, 29],
  "%=" => [30, 29],
  "<<=" => [30, 29],
  ">>=" => [30, 29],
  "&=" => [30, 29],
  "|=" => [30, 29],
  "^=" => [30, 29],
  "||=" => [30, 29],
  "&&=" => [30, 29],
  "rescue" => [35, 34],
  "?" => [40, 39],
  ".." => [50, 51],
  "..." => [50, 51],
  "||" => [60, 61],
  "and" => [70, 71],
  "&&" => [70, 71],
  "==" => [80, 81],
  "===" => [80, 81],
  "!=" => [80, 81],
  "!==" => [80, 81],
  "<=>" => [80, 81],
  "=~" => [80, 81],
  "~=" => [80, 81],
  "!~" => [80, 81],
  ">=" => [90, 91],
  "<=" => [90, 91],
  ">" => [90, 91],
  "<" => [90, 91],
  "|" => [100, 101],
  "^" => [105, 106],
  "&" => [110, 111],
  "<<" => [120, 121],
  ">>" => [120, 121],
  "+" => [130, 131],
  "-" => [130, 131],
  "*" => [140, 141],
  "/" => [140, 141],
  "%" => [140, 141],
  "×" => [140, 141],
  "÷" => [140, 141],
  "**" => [160, 159]
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/code/parser.rb', line 130

def initialize(input)
  @input = input.to_s
  @tokens = lex(@input)
  @index = 0
end

Class Method Details

.parse ⇒ Object 



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# File 'lib/code/parser.rb', line 136

def self.parse(...)
  new(...).parse
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/code/parser.rb', line 140

def parse
  Node::Code.new(parse_code)
end