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Class: SyntaxSuggest::CodeSearch

Relationships & Source Files
Inherits: Object
Defined in: lib/syntax_suggest/code_search.rb

Overview

Searches code for a syntax error

There are three main phases in the algorithm:

  1. Sanitize/format input source

  2. Search for invalid blocks

  3. Format invalid blocks into something meaninful

This class handles the part.

The bulk of the heavy lifting is done in:

- CodeFrontier (Holds information for generating blocks and determining if we can stop searching)
- ParseBlocksFromLine (Creates blocks into the frontier)
- BlockExpand (Expands existing blocks to search more code)

Syntax error detection

When the frontier holds the syntax error, we can stop searching

search = CodeSearch.new(<<~EOM)
  def dog
    def lol
  end
EOM

search.call

search.invalid_blocks.map(&:to_s) # =>
# => ["def lol\n"]

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(source, record_dir: DEFAULT_VALUE) ⇒ CodeSearch

[ GitHub ] 

  


# File 'lib/syntax_suggest/code_search.rb', line 44



def initialize(source, record_dir: DEFAULT_VALUE)
  record_dir = if record_dir == DEFAULT_VALUE
    (ENV["SYNTAX_SUGGEST_RECORD_DIR"] || ENV["SYNTAX_SUGGEST_DEBUG"]) ? "tmp" : nil
  else
    record_dir
  end

  if record_dir
    @record_dir = SyntaxSuggest.record_dir(record_dir)
    @write_count = 0
  end

  @tick = 0
  @source = source
  @name_tick = Hash.new { |hash, k| hash[k] = 0 }
  @invalid_blocks = []

  @code_lines = CleanDocument.new(source: source).call.lines

  @frontier = CodeFrontier.new(code_lines: @code_lines)
  @block_expand = BlockExpand.new(code_lines: @code_lines)
  @parse_blocks_from_indent_line = ParseBlocksFromIndentLine.new(code_lines: @code_lines)
end


  







Instance Attribute Details



  

    #code_lines   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 42



attr_reader :invalid_blocks, :record_dir, :code_lines


  








  

    #frontier   (readonly, private)
  

  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 38



attr_reader :frontier


  








  

    #invalid_blocks   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 42



attr_reader :invalid_blocks, :record_dir, :code_lines


  








  

    #record_dir   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 42



attr_reader :invalid_blocks, :record_dir, :code_lines


  







Instance Method Details



  

    #call  
  



  

    

Main search loop


  



  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 123



def call
  until frontier.holds_all_syntax_errors?
    @tick += 1

    if frontier.expand?
      expand_existing
    else
      create_blocks_from_untracked_lines
    end
  end

  @invalid_blocks.concat(frontier.detect_invalid_blocks)
  @invalid_blocks.sort_by! { |block| block.starts_at }
  self
end


  








  

    #create_blocks_from_untracked_lines  
  



  

    

Parses the most indented lines into blocks that are marked and added to the frontier


  



  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 100



def create_blocks_from_untracked_lines
  max_indent = frontier.next_indent_line&.indent

  while (line = frontier.next_indent_line) && (line.indent == max_indent)
    @parse_blocks_from_indent_line.each_neighbor_block(frontier.next_indent_line) do |block|
      push(block, name: "add")
    end
  end
end


  








  

    #expand_existing  
  



  

    

Given an already existing block in the frontier, expand it to see if it contains our invalid syntax


  



  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 112



def expand_existing
  block = frontier.pop
  return unless block

  record(block: block, name: "before-expand")

  block = @block_expand.call(block)
  push(block, name: "expand")
end


  








  

    #push(block, name:)  
  

  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 91



def push(block, name:)
  record(block: block, name: name)

  block.mark_invisible if block.valid?
  frontier << block
end


  








  

    #record(block:, name: "record")  
  



  

    

Used for debugging


  



  [ GitHub ]


  

  


# File 'lib/syntax_suggest/code_search.rb', line 69



def record(block:, name: "record")
  return unless @record_dir
  @name_tick[name] += 1
  filename = "#{@write_count += 1}-#{name}-#{@name_tick[name]}-(#{block.starts_at}__#{block.ends_at}).txt"
  if ENV["SYNTAX_SUGGEST_DEBUG"]
    puts "\n\n==== #{filename} ===="
    puts "\n```#{block.starts_at}..#{block.ends_at}"
    puts block
    puts "```"
    puts "  block indent:      #{block.current_indent}"
  end
  @record_dir.join(filename).open(mode: "a") do |f|
    document = DisplayCodeWithLineNumbers.new(
      lines: @code_lines.select(&:visible?),
      terminal: false,
      highlight_lines: block.lines
    ).call

    f.write("    Block lines: #{block.starts_at..block.ends_at} (#{name}) \n\n#{document}")
  end
end