class SyntaxSuggest::ScanHistory

Scans up/down from the given block

You can try out a change, stash it, or commit it to save for later

Example:

scanner = ScanHistory.new(code_lines: code_lines, block: block)
scanner.scan(
  up: ->(_, _, _) { true },
  down: ->(_, _, _) { true }
)
scanner.changed? # => true
expect(scanner.lines).to eq(code_lines)

scanner.stash_changes

expect(scanner.lines).to_not eq(code_lines)

Attributes

after_index [R]

before_index [R]

Public Class Methods

new (code_lines:, block:)

Source

# File lib/syntax_suggest/scan_history.rb, line 24
def initialize(code_lines:, block:)
  @code_lines = code_lines
  @history = [block]
  refresh_index
end

Public Instance Methods

changed? ()

Source

# File lib/syntax_suggest/scan_history.rb, line 56
def changed?
  @before_index != current.lines.first.index ||
    @after_index != current.lines.last.index
end

commit_if_changed ()

Source

# File lib/syntax_suggest/scan_history.rb, line 30
def commit_if_changed
  if changed?
    @history << CodeBlock.new(lines: @code_lines[before_index..after_index])
  end

  self
end

lines ()

Source

# File lib/syntax_suggest/scan_history.rb, line 110
def lines
  @code_lines[@before_index..@after_index]
end

next_down ()

Source

# File lib/syntax_suggest/scan_history.rb, line 104
def next_down
  return nil if @after_index >= @code_lines.length

  @code_lines[@after_index + 1]
end

next_up ()

Source

# File lib/syntax_suggest/scan_history.rb, line 98
def next_up
  return nil if @before_index <= 0

  @code_lines[@before_index - 1]
end

revert_last_commit ()

Source

# File lib/syntax_suggest/scan_history.rb, line 47
def revert_last_commit
  if @history.length > 1
    @history.pop
    refresh_index
  end

  self
end

Discard changes that have not been committed and revert the last commit

Cannot revert the first commit

scan (up:, down:)

Source

# File lib/syntax_suggest/scan_history.rb, line 64
def scan(up:, down:)
  kw_count = 0
  end_count = 0

  up_index = before_lines.reverse_each.take_while do |line|
    kw_count += 1 if line.is_kw?
    end_count += 1 if line.is_end?
    up.call(line, kw_count, end_count)
  end.last&.index

  kw_count = 0
  end_count = 0

  down_index = after_lines.each.take_while do |line|
    kw_count += 1 if line.is_kw?
    end_count += 1 if line.is_end?
    down.call(line, kw_count, end_count)
  end.last&.index

  @before_index = if up_index && up_index < @before_index
    up_index
  else
    @before_index
  end

  @after_index = if down_index && down_index > @after_index
    down_index
  else
    @after_index
  end

  self
end

Iterates up and down

Returns line, kw_count, end_count for each iteration

stash_changes ()

Source

# File lib/syntax_suggest/scan_history.rb, line 39
def stash_changes
  refresh_index
  self
end

Discards any changes that have not been committed

Private Instance Methods

after_lines ()

Source

# File lib/syntax_suggest/scan_history.rb, line 120
        def after_lines
  @code_lines[@after_index.next..] || []
end

Returns an array of all the CodeLines that exist after the currently scanned block

before_lines ()

Source

# File lib/syntax_suggest/scan_history.rb, line 114
        def before_lines
  @code_lines[0...@before_index] || []
end

current ()

Source

# File lib/syntax_suggest/scan_history.rb, line 124
        def current
  @history.last
end

refresh_index ()

Source

# File lib/syntax_suggest/scan_history.rb, line 128
        def refresh_index
  @before_index = current.lines.first.index
  @after_index = current.lines.last.index
  self
end