Class: Parser::Base

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/parser/base.rb

Overview

Base class for version-specific parsers.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(builder = Parser::Builders::Default.new) ⇒ Base

Returns a new instance of Base.

Parameters:

  • builder (Parser::Builders::Default) (defaults to: Parser::Builders::Default.new)

    The AST builder to use.


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# File 'lib/parser/base.rb', line 125

def initialize(builder=Parser::Builders::Default.new)
  @diagnostics = Diagnostic::Engine.new

  @static_env  = StaticEnvironment.new

  # Stack that holds current parsing context
  @context = Context.new

  # Maximum numbered parameters stack
  @max_numparam_stack = MaxNumparamStack.new

  # Current argument names stack
  @current_arg_stack = CurrentArgStack.new

  # Stack of set of variables used in the current pattern
  @pattern_variables = VariablesStack.new

  # Stack of set of keys used in the current hash in pattern matchinig
  @pattern_hash_keys = VariablesStack.new

  @lexer = Lexer.new(version)
  @lexer.diagnostics = @diagnostics
  @lexer.static_env  = @static_env
  @lexer.context     = @context

  @builder = builder
  @builder.parser = self

  # Last emitted token
  @last_token = nil

  if self.class::Racc_debug_parser && ENV['RACC_DEBUG']
    @yydebug = true
  end

  reset
end

Instance Attribute Details

#builderObject (readonly)


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# File 'lib/parser/base.rb', line 113

def builder
  @builder
end

#contextObject (readonly)


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# File 'lib/parser/base.rb', line 116

def context
  @context
end

#current_arg_stackObject (readonly)


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# File 'lib/parser/base.rb', line 118

def current_arg_stack
  @current_arg_stack
end

#diagnosticsParser::Diagnostic::Engine (readonly)


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# File 'lib/parser/base.rb', line 16

class Base < Racc::Parser
  ##
  # Parses a string of Ruby code and returns the AST. If the source
  # cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @example
  #  Parser::Base.parse('puts "hello"')
  #
  # @param [String] string The block of code to parse.
  # @param [String] file The name of the file the code originated from.
  # @param [Numeric] line The initial line number.
  # @return [Parser::AST::Node]
  #
  def self.parse(string, file='(string)', line=1)
    parser = default_parser
    source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
    parser.parse(source_buffer)
  end

  ##
  # Parses a string of Ruby code and returns the AST and comments. If the
  # source cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @example
  #  Parser::Base.parse_with_comments('puts "hello"')
  #
  # @param [String] string The block of code to parse.
  # @param [String] file The name of the file the code originated from.
  # @param [Numeric] line The initial line number.
  # @return [Array]
  #
  def self.parse_with_comments(string, file='(string)', line=1)
    parser = default_parser
    source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
    parser.parse_with_comments(source_buffer)
  end

  ##
  # Parses Ruby source code by reading it from a file. If the source
  # cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @param [String] filename Path to the file to parse.
  # @return [Parser::AST::Node]
  # @see #parse
  #
  def self.parse_file(filename)
    parse(File.read(filename), filename)
  end

  ##
  # Parses Ruby source code by reading it from a file and returns the AST and
  # comments. If the source cannot be parsed, {SyntaxError} is raised and a
  # diagnostic is printed to `stderr`.
  #
  # @param [String] filename Path to the file to parse.
  # @return [Array]
  # @see #parse
  #
  def self.parse_file_with_comments(filename)
    parse_with_comments(File.read(filename), filename)
  end

  ##
  # @return [Parser::Base] parser with the default options set.
  #
  def self.default_parser
    parser = new

    parser.diagnostics.all_errors_are_fatal = true
    parser.diagnostics.ignore_warnings      = true

    parser.diagnostics.consumer = lambda do |diagnostic|
      $stderr.puts(diagnostic.render)
    end

    parser
  end

  def self.setup_source_buffer(file, line, string, encoding)
    string = string.dup.force_encoding(encoding)

    source_buffer = Source::Buffer.new(file, line)

    if name == 'Parser::Ruby18'
      source_buffer.raw_source = string
    else
      source_buffer.source     = string
    end

    source_buffer
  end
  private_class_method :setup_source_buffer

  attr_reader :diagnostics
  attr_reader :builder
  attr_reader :static_env
  attr_reader :source_buffer
  attr_reader :context
  attr_reader :max_numparam_stack
  attr_reader :current_arg_stack
  attr_reader :pattern_variables
  attr_reader :pattern_hash_keys

  ##
  # @param [Parser::Builders::Default] builder The AST builder to use.
  #
  def initialize(builder=Parser::Builders::Default.new)
    @diagnostics = Diagnostic::Engine.new

    @static_env  = StaticEnvironment.new

    # Stack that holds current parsing context
    @context = Context.new

    # Maximum numbered parameters stack
    @max_numparam_stack = MaxNumparamStack.new

    # Current argument names stack
    @current_arg_stack = CurrentArgStack.new

    # Stack of set of variables used in the current pattern
    @pattern_variables = VariablesStack.new

    # Stack of set of keys used in the current hash in pattern matchinig
    @pattern_hash_keys = VariablesStack.new

    @lexer = Lexer.new(version)
    @lexer.diagnostics = @diagnostics
    @lexer.static_env  = @static_env
    @lexer.context     = @context

    @builder = builder
    @builder.parser = self

    # Last emitted token
    @last_token = nil

    if self.class::Racc_debug_parser && ENV['RACC_DEBUG']
      @yydebug = true
    end

    reset
  end

  ##
  # Resets the state of the parser.
  #
  def reset
    @source_buffer = nil

    @lexer.reset
    @static_env.reset
    @context.reset
    @current_arg_stack.reset
    @pattern_variables.reset
    @pattern_hash_keys.reset

    self
  end

  ##
  # Parses a source buffer and returns the AST, or `nil` in case of a non fatal error.
  #
  # @param [Parser::Source::Buffer] source_buffer The source buffer to parse.
  # @return [Parser::AST::Node, nil]
  #
  def parse(source_buffer)
    @lexer.source_buffer = source_buffer
    @source_buffer       = source_buffer

    do_parse || nil # Force `false` to `nil`, see https://github.com/ruby/racc/pull/136
  ensure
    # Don't keep references to the source file.
    @source_buffer       = nil
    @lexer.source_buffer = nil
  end

  ##
  # Parses a source buffer and returns the AST and the source code comments.
  #
  # @see #parse
  # @see Parser::Source::Comment#associate
  # @return [Array]
  #
  def parse_with_comments(source_buffer)
    @lexer.comments = []

    [ parse(source_buffer), @lexer.comments ]
  ensure
    @lexer.comments = nil
  end

  ##
  # Parses a source buffer and returns the AST, the source code comments,
  # and the tokens emitted by the lexer. In case of a fatal error, a {SyntaxError}
  # is raised, unless `recover` is true. In case of an error
  # (non-fatal or recovered), `nil` is returned instead of the AST, and
  # comments as well as tokens are only returned up to the location of
  # the error.
  #
  # Currently, token stream format returned by #tokenize is not documented,
  # but is considered part of a public API and only changed according
  # to Semantic Versioning.
  #
  # However, note that the exact token composition of various constructs
  # might vary. For example, a string `"foo"` is represented equally well
  # by `:tSTRING_BEG " :tSTRING_CONTENT foo :tSTRING_END "` and
  # `:tSTRING "foo"`; such details must not be relied upon.
  #
  # @param [Parser::Source::Buffer] source_buffer
  # @param [Boolean] recover If true, recover from syntax errors. False by default.
  # @return [Array]
  #
  def tokenize(source_buffer, recover=false)
    @lexer.tokens = []
    @lexer.comments = []

    begin
      ast = parse(source_buffer)
    rescue Parser::SyntaxError
      raise if !recover
    end

    [ ast, @lexer.comments, @lexer.tokens ]
  ensure
    @lexer.tokens = nil
    @lexer.comments = nil
  end

  private

  def next_token
    token = @lexer.advance
    @last_token = token
    token
  end

  def check_kwarg_name(name_t)
    case name_t[0]
    when /^[a-z_]/
      # OK
    when /^[A-Z]/
      diagnostic :error, :argument_const, nil, name_t
    end
  end

  def diagnostic(level, reason, arguments, location_t, highlights_ts=[])
    _, location = location_t

    highlights = highlights_ts.map do |token|
      _, range = token
      range
    end

    @diagnostics.process(
        Diagnostic.new(level, reason, arguments, location, highlights))

    if level == :error
      yyerror
    end
  end

  def on_error(error_token_id, error_value, value_stack)
    token_name = token_to_str(error_token_id)
    _, location = error_value

    @diagnostics.process(Diagnostic.new(
        :error, :unexpected_token, { :token => token_name }, location))
  end
end

#max_numparam_stackObject (readonly)


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# File 'lib/parser/base.rb', line 117

def max_numparam_stack
  @max_numparam_stack
end

#pattern_hash_keysObject (readonly)


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# File 'lib/parser/base.rb', line 120

def pattern_hash_keys
  @pattern_hash_keys
end

#pattern_variablesObject (readonly)


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# File 'lib/parser/base.rb', line 119

def pattern_variables
  @pattern_variables
end

#source_bufferObject (readonly)


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# File 'lib/parser/base.rb', line 115

def source_buffer
  @source_buffer
end

#static_envParser::StaticEnvironment (readonly)

Returns:

  • (Parser::StaticEnvironment)

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# File 'lib/parser/base.rb', line 16

class Base < Racc::Parser
  ##
  # Parses a string of Ruby code and returns the AST. If the source
  # cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @example
  #  Parser::Base.parse('puts "hello"')
  #
  # @param [String] string The block of code to parse.
  # @param [String] file The name of the file the code originated from.
  # @param [Numeric] line The initial line number.
  # @return [Parser::AST::Node]
  #
  def self.parse(string, file='(string)', line=1)
    parser = default_parser
    source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
    parser.parse(source_buffer)
  end

  ##
  # Parses a string of Ruby code and returns the AST and comments. If the
  # source cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @example
  #  Parser::Base.parse_with_comments('puts "hello"')
  #
  # @param [String] string The block of code to parse.
  # @param [String] file The name of the file the code originated from.
  # @param [Numeric] line The initial line number.
  # @return [Array]
  #
  def self.parse_with_comments(string, file='(string)', line=1)
    parser = default_parser
    source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
    parser.parse_with_comments(source_buffer)
  end

  ##
  # Parses Ruby source code by reading it from a file. If the source
  # cannot be parsed, {SyntaxError} is raised and a diagnostic is
  # printed to `stderr`.
  #
  # @param [String] filename Path to the file to parse.
  # @return [Parser::AST::Node]
  # @see #parse
  #
  def self.parse_file(filename)
    parse(File.read(filename), filename)
  end

  ##
  # Parses Ruby source code by reading it from a file and returns the AST and
  # comments. If the source cannot be parsed, {SyntaxError} is raised and a
  # diagnostic is printed to `stderr`.
  #
  # @param [String] filename Path to the file to parse.
  # @return [Array]
  # @see #parse
  #
  def self.parse_file_with_comments(filename)
    parse_with_comments(File.read(filename), filename)
  end

  ##
  # @return [Parser::Base] parser with the default options set.
  #
  def self.default_parser
    parser = new

    parser.diagnostics.all_errors_are_fatal = true
    parser.diagnostics.ignore_warnings      = true

    parser.diagnostics.consumer = lambda do |diagnostic|
      $stderr.puts(diagnostic.render)
    end

    parser
  end

  def self.setup_source_buffer(file, line, string, encoding)
    string = string.dup.force_encoding(encoding)

    source_buffer = Source::Buffer.new(file, line)

    if name == 'Parser::Ruby18'
      source_buffer.raw_source = string
    else
      source_buffer.source     = string
    end

    source_buffer
  end
  private_class_method :setup_source_buffer

  attr_reader :diagnostics
  attr_reader :builder
  attr_reader :static_env
  attr_reader :source_buffer
  attr_reader :context
  attr_reader :max_numparam_stack
  attr_reader :current_arg_stack
  attr_reader :pattern_variables
  attr_reader :pattern_hash_keys

  ##
  # @param [Parser::Builders::Default] builder The AST builder to use.
  #
  def initialize(builder=Parser::Builders::Default.new)
    @diagnostics = Diagnostic::Engine.new

    @static_env  = StaticEnvironment.new

    # Stack that holds current parsing context
    @context = Context.new

    # Maximum numbered parameters stack
    @max_numparam_stack = MaxNumparamStack.new

    # Current argument names stack
    @current_arg_stack = CurrentArgStack.new

    # Stack of set of variables used in the current pattern
    @pattern_variables = VariablesStack.new

    # Stack of set of keys used in the current hash in pattern matchinig
    @pattern_hash_keys = VariablesStack.new

    @lexer = Lexer.new(version)
    @lexer.diagnostics = @diagnostics
    @lexer.static_env  = @static_env
    @lexer.context     = @context

    @builder = builder
    @builder.parser = self

    # Last emitted token
    @last_token = nil

    if self.class::Racc_debug_parser && ENV['RACC_DEBUG']
      @yydebug = true
    end

    reset
  end

  ##
  # Resets the state of the parser.
  #
  def reset
    @source_buffer = nil

    @lexer.reset
    @static_env.reset
    @context.reset
    @current_arg_stack.reset
    @pattern_variables.reset
    @pattern_hash_keys.reset

    self
  end

  ##
  # Parses a source buffer and returns the AST, or `nil` in case of a non fatal error.
  #
  # @param [Parser::Source::Buffer] source_buffer The source buffer to parse.
  # @return [Parser::AST::Node, nil]
  #
  def parse(source_buffer)
    @lexer.source_buffer = source_buffer
    @source_buffer       = source_buffer

    do_parse || nil # Force `false` to `nil`, see https://github.com/ruby/racc/pull/136
  ensure
    # Don't keep references to the source file.
    @source_buffer       = nil
    @lexer.source_buffer = nil
  end

  ##
  # Parses a source buffer and returns the AST and the source code comments.
  #
  # @see #parse
  # @see Parser::Source::Comment#associate
  # @return [Array]
  #
  def parse_with_comments(source_buffer)
    @lexer.comments = []

    [ parse(source_buffer), @lexer.comments ]
  ensure
    @lexer.comments = nil
  end

  ##
  # Parses a source buffer and returns the AST, the source code comments,
  # and the tokens emitted by the lexer. In case of a fatal error, a {SyntaxError}
  # is raised, unless `recover` is true. In case of an error
  # (non-fatal or recovered), `nil` is returned instead of the AST, and
  # comments as well as tokens are only returned up to the location of
  # the error.
  #
  # Currently, token stream format returned by #tokenize is not documented,
  # but is considered part of a public API and only changed according
  # to Semantic Versioning.
  #
  # However, note that the exact token composition of various constructs
  # might vary. For example, a string `"foo"` is represented equally well
  # by `:tSTRING_BEG " :tSTRING_CONTENT foo :tSTRING_END "` and
  # `:tSTRING "foo"`; such details must not be relied upon.
  #
  # @param [Parser::Source::Buffer] source_buffer
  # @param [Boolean] recover If true, recover from syntax errors. False by default.
  # @return [Array]
  #
  def tokenize(source_buffer, recover=false)
    @lexer.tokens = []
    @lexer.comments = []

    begin
      ast = parse(source_buffer)
    rescue Parser::SyntaxError
      raise if !recover
    end

    [ ast, @lexer.comments, @lexer.tokens ]
  ensure
    @lexer.tokens = nil
    @lexer.comments = nil
  end

  private

  def next_token
    token = @lexer.advance
    @last_token = token
    token
  end

  def check_kwarg_name(name_t)
    case name_t[0]
    when /^[a-z_]/
      # OK
    when /^[A-Z]/
      diagnostic :error, :argument_const, nil, name_t
    end
  end

  def diagnostic(level, reason, arguments, location_t, highlights_ts=[])
    _, location = location_t

    highlights = highlights_ts.map do |token|
      _, range = token
      range
    end

    @diagnostics.process(
        Diagnostic.new(level, reason, arguments, location, highlights))

    if level == :error
      yyerror
    end
  end

  def on_error(error_token_id, error_value, value_stack)
    token_name = token_to_str(error_token_id)
    _, location = error_value

    @diagnostics.process(Diagnostic.new(
        :error, :unexpected_token, { :token => token_name }, location))
  end
end

Class Method Details

.default_parserParser::Base

Returns parser with the default options set.

Returns:


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# File 'lib/parser/base.rb', line 84

def self.default_parser
  parser = new

  parser.diagnostics.all_errors_are_fatal = true
  parser.diagnostics.ignore_warnings      = true

  parser.diagnostics.consumer = lambda do |diagnostic|
    $stderr.puts(diagnostic.render)
  end

  parser
end

.parse(string, file = '(string)', line = 1) ⇒ Parser::AST::Node

Parses a string of Ruby code and returns the AST. If the source cannot be parsed, SyntaxError is raised and a diagnostic is printed to stderr.

Examples:

Parser::Base.parse('puts "hello"')

Parameters:

  • string (String)

    The block of code to parse.

  • file (String) (defaults to: '(string)')

    The name of the file the code originated from.

  • line (Numeric) (defaults to: 1)

    The initial line number.

Returns:


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# File 'lib/parser/base.rb', line 30

def self.parse(string, file='(string)', line=1)
  parser = default_parser
  source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
  parser.parse(source_buffer)
end

.parse_file(filename) ⇒ Parser::AST::Node

Parses Ruby source code by reading it from a file. If the source cannot be parsed, SyntaxError is raised and a diagnostic is printed to stderr.

Parameters:

  • filename (String)

    Path to the file to parse.

Returns:

See Also:


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# File 'lib/parser/base.rb', line 64

def self.parse_file(filename)
  parse(File.read(filename), filename)
end

.parse_file_with_comments(filename) ⇒ Array

Parses Ruby source code by reading it from a file and returns the AST and comments. If the source cannot be parsed, SyntaxError is raised and a diagnostic is printed to stderr.

Parameters:

  • filename (String)

    Path to the file to parse.

Returns:

  • (Array)

See Also:


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# File 'lib/parser/base.rb', line 77

def self.parse_file_with_comments(filename)
  parse_with_comments(File.read(filename), filename)
end

.parse_with_comments(string, file = '(string)', line = 1) ⇒ Array

Parses a string of Ruby code and returns the AST and comments. If the source cannot be parsed, SyntaxError is raised and a diagnostic is printed to stderr.

Examples:

Parser::Base.parse_with_comments('puts "hello"')

Parameters:

  • string (String)

    The block of code to parse.

  • file (String) (defaults to: '(string)')

    The name of the file the code originated from.

  • line (Numeric) (defaults to: 1)

    The initial line number.

Returns:

  • (Array)

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# File 'lib/parser/base.rb', line 49

def self.parse_with_comments(string, file='(string)', line=1)
  parser = default_parser
  source_buffer = setup_source_buffer(file, line, string, parser.default_encoding)
  parser.parse_with_comments(source_buffer)
end

Instance Method Details

#parse(source_buffer) ⇒ Parser::AST::Node?

Parses a source buffer and returns the AST, or nil in case of a non fatal error.

Parameters:

Returns:


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# File 'lib/parser/base.rb', line 185

def parse(source_buffer)
  @lexer.source_buffer = source_buffer
  @source_buffer       = source_buffer

  do_parse || nil # Force `false` to `nil`, see https://github.com/ruby/racc/pull/136
ensure
  # Don't keep references to the source file.
  @source_buffer       = nil
  @lexer.source_buffer = nil
end

#parse_with_comments(source_buffer) ⇒ Array

Parses a source buffer and returns the AST and the source code comments.

Returns:

  • (Array)

See Also:

  • #parse
  • Source::Comment#associate

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# File 'lib/parser/base.rb', line 203

def parse_with_comments(source_buffer)
  @lexer.comments = []

  [ parse(source_buffer), @lexer.comments ]
ensure
  @lexer.comments = nil
end

#resetObject

Resets the state of the parser.


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# File 'lib/parser/base.rb', line 166

def reset
  @source_buffer = nil

  @lexer.reset
  @static_env.reset
  @context.reset
  @current_arg_stack.reset
  @pattern_variables.reset
  @pattern_hash_keys.reset

  self
end

#tokenize(source_buffer, recover = false) ⇒ Array

Parses a source buffer and returns the AST, the source code comments, and the tokens emitted by the lexer. In case of a fatal error, a SyntaxError is raised, unless recover is true. In case of an error (non-fatal or recovered), nil is returned instead of the AST, and comments as well as tokens are only returned up to the location of the error.

Currently, token stream format returned by #tokenize is not documented, but is considered part of a public API and only changed according to Semantic Versioning.

However, note that the exact token composition of various constructs might vary. For example, a string "foo" is represented equally well by :tSTRING_BEG " :tSTRING_CONTENT foo :tSTRING_END " and :tSTRING "foo"; such details must not be relied upon.

Parameters:

  • source_buffer (Parser::Source::Buffer)
  • recover (Boolean) (defaults to: false)

    If true, recover from syntax errors. False by default.

Returns:

  • (Array)

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# File 'lib/parser/base.rb', line 232

def tokenize(source_buffer, recover=false)
  @lexer.tokens = []
  @lexer.comments = []

  begin
    ast = parse(source_buffer)
  rescue Parser::SyntaxError
    raise if !recover
  end

  [ ast, @lexer.comments, @lexer.tokens ]
ensure
  @lexer.tokens = nil
  @lexer.comments = nil
end