Class: Prism::Translation::Parser

Inherits:
Parser::Base
  • Object
show all
Defined in:
lib/prism/translation/parser.rb,
lib/prism/translation/parser/lexer.rb,
lib/prism/translation/parser/compiler.rb

Overview

This class is the entry-point for converting a prism syntax tree into the whitequark/parser gem’s syntax tree. It inherits from the base parser for the parser gem, and overrides the parse* methods to parse with prism and then translate.

Direct Known Subclasses

Parser33, Parser34

Defined Under Namespace

Classes: Compiler, PrismDiagnostic

Constant Summary collapse

Racc_debug_parser =

:nodoc:

false

Instance Method Summary collapse

Instance Method Details

#default_encoding ⇒ Object

The default encoding for Ruby files is UTF-8.



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# File 'lib/prism/translation/parser.rb', line 41

def default_encoding
  Encoding::UTF_8
end

#parse(source_buffer) ⇒ Object

Parses a source buffer and returns the AST.



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# File 'lib/prism/translation/parser.rb', line 49

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

  offset_cache = build_offset_cache(source)
  result = unwrap(Prism.parse(source, filepath: source_buffer.name, version: convert_for_prism(version), partial_script: true, encoding: false), offset_cache)

  build_ast(result.value, offset_cache)
ensure
  @source_buffer = nil
end

#parse_with_comments(source_buffer) ⇒ Object

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



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# File 'lib/prism/translation/parser.rb', line 62

def parse_with_comments(source_buffer)
  @source_buffer = source_buffer
  source = source_buffer.source

  offset_cache = build_offset_cache(source)
  result = unwrap(Prism.parse(source, filepath: source_buffer.name, version: convert_for_prism(version), partial_script: true, encoding: false), offset_cache)

  [
    build_ast(result.value, offset_cache),
    build_comments(result.comments, offset_cache)
  ]
ensure
  @source_buffer = nil
end

#tokenize(source_buffer, recover = false) ⇒ Object

Parses a source buffer and returns the AST, the source code comments, and the tokens emitted by the lexer.



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# File 'lib/prism/translation/parser.rb', line 79

def tokenize(source_buffer, recover = false)
  @source_buffer = source_buffer
  source = source_buffer.source

  offset_cache = build_offset_cache(source)
  result =
    begin
      unwrap(Prism.parse_lex(source, filepath: source_buffer.name, version: convert_for_prism(version), partial_script: true, encoding: false), offset_cache)
    rescue ::Parser::SyntaxError
      raise if !recover
    end

  program, tokens = result.value
  ast = build_ast(program, offset_cache) if result.success?

  [
    ast,
    build_comments(result.comments, offset_cache),
    build_tokens(tokens, offset_cache)
  ]
ensure
  @source_buffer = nil
end

#try_declare_numparam(node) ⇒ Object

Since prism resolves num params for us, we don’t need to support this kind of logic here.



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# File 'lib/prism/translation/parser.rb', line 105

def try_declare_numparam(node)
  node.children[0].match?(/\A_[1-9]\z/)
end

#version ⇒ Object

:nodoc:



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# File 'lib/prism/translation/parser.rb', line 36

def version # :nodoc:
  34
end

#yyerror ⇒ Object

:nodoc:



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# File 'lib/prism/translation/parser.rb', line 45

def yyerror # :nodoc:
end