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?? block_expand.rb(4.88 KB)
?? capture
?? capture_code_context.rb(6.67 KB)
?? clean_document.rb(8.73 KB)
?? cli.rb(3.12 KB)
?? code_block.rb(2.13 KB)
?? code_frontier.rb(5.61 KB)
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?? code_search.rb(3.81 KB)
?? core_ext.rb(2.65 KB)
?? display_code_with_line_numbers.rb(1.77 KB)
?? display_invalid_blocks.rb(1.75 KB)
?? explain_syntax.rb(2.69 KB)
?? left_right_lex_count.rb(4.06 KB)
?? lex_all.rb(1.66 KB)
?? lex_value.rb(1.5 KB)
?? mini_stringio.rb(774 B)
?? parse_blocks_from_indent_line.rb(1.5 KB)
?? pathname_from_message.rb(1.42 KB)
?? priority_engulf_queue.rb(1.26 KB)
?? priority_queue.rb(2 KB)
?? ripper_errors.rb(960 B)
?? scan_history.rb(2.92 KB)
?? unvisited_lines.rb(705 B)
?? version.rb(76 B)

Editing: explain_syntax.rb

# frozen_string_literal: true

require_relative "left_right_lex_count"

if !SyntaxSuggest.use_prism_parser?
  require_relative "ripper_errors"
end

module SyntaxSuggest
  class GetParseErrors
    def self.errors(source)
      if SyntaxSuggest.use_prism_parser?
        Prism.parse(source).errors.map(&:message)
      else
        RipperErrors.new(source).call.errors
      end
    end
  end

# Explains syntax errors based on their source
  #
  # example:
  #
  #   source = "def foo; puts 'lol'" # Note missing end
  #   explain ExplainSyntax.new(
  #     code_lines: CodeLine.from_source(source)
  #   ).call
  #   explain.errors.first
  #   # => "Unmatched keyword, missing `end' ?"
  #
  # When the error cannot be determined by lexical counting
  # then the parser is run against the input and the raw
  # errors are returned.
  #
  # Example:
  #
  #   source = "1 * " # Note missing a second number
  #   explain ExplainSyntax.new(
  #     code_lines: CodeLine.from_source(source)
  #   ).call
  #   explain.errors.first
  #   # => "syntax error, unexpected end-of-input"
  class ExplainSyntax
    INVERSE = {
      "{" => "}",
      "}" => "{",
      "[" => "]",
      "]" => "[",
      "(" => ")",
      ")" => "(",
      "|" => "|"
    }.freeze

def initialize(code_lines:)
      @code_lines = code_lines
      @left_right = LeftRightLexCount.new
      @missing = nil
    end

def call
      @code_lines.each do |line|
        line.lex.each do |lex|
          @left_right.count_lex(lex)
        end
      end

self
    end

# Returns an array of missing elements
    #
    # For example this:
    #
    #   ExplainSyntax.new(code_lines: lines).missing
    #   # => ["}"]
    #
    # Would indicate that the source is missing
    # a `}` character in the source code
    def missing
      @missing ||= @left_right.missing
    end

# Converts a missing string to
    # an human understandable explanation.
    #
    # Example:
    #
    #   explain.why("}")
    #   # => "Unmatched `{', missing `}' ?"
    #
    def why(miss)
      case miss
      when "keyword"
        "Unmatched `end', missing keyword (`do', `def`, `if`, etc.) ?"
      when "end"
        "Unmatched keyword, missing `end' ?"
      else
        inverse = INVERSE.fetch(miss) {
          raise "Unknown explain syntax char or key: #{miss.inspect}"
        }
        "Unmatched `#{inverse}', missing `#{miss}' ?"
      end
    end

# Returns an array of syntax error messages
    #
    # If no missing pairs are found it falls back
    # on the original error messages
    def errors
      if missing.empty?
        return GetParseErrors.errors(@code_lines.map(&:original).join).uniq
      end

missing.map { |miss| why(miss) }
    end
  end
end

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Editing: explain_syntax.rb

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