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# frozen_string_literal: true
module SyntaxSuggest
# This class is useful for exploring contents before and after
# a block
#
# It searches above and below the passed in block to match for
# whatever criteria you give it:
#
# Example:
#
# def dog # 1
# puts "bark" # 2
# puts "bark" # 3
# end # 4
#
# scan = AroundBlockScan.new(
# code_lines: code_lines
# block: CodeBlock.new(lines: code_lines[1])
# )
#
# scan.scan_while { true }
#
# puts scan.before_index # => 0
# puts scan.after_index # => 3
#
# Contents can also be filtered using AroundBlockScan#skip
#
# To grab the next surrounding indentation use AroundBlockScan#scan_adjacent_indent
class AroundBlockScan
def initialize(code_lines:, block:)
@code_lines = code_lines
@orig_before_index = block.lines.first.index
@orig_after_index = block.lines.last.index
@orig_indent = block.current_indent
@skip_array = []
@after_array = []
@before_array = []
@stop_after_kw = false
@skip_hidden = false
@skip_empty = false
end
def skip(name)
case name
when :hidden?
@skip_hidden = true
when :empty?
@skip_empty = true
else
raise "Unsupported skip #{name}"
end
self
end
def stop_after_kw
@stop_after_kw = true
self
end
def scan_while
stop_next = false
kw_count = 0
end_count = 0
index = before_lines.reverse_each.take_while do |line|
next false if stop_next
next true if @skip_hidden && line.hidden?
next true if @skip_empty && line.empty?
kw_count += 1 if line.is_kw?
end_count += 1 if line.is_end?
if @stop_after_kw && kw_count > end_count
stop_next = true
end
yield line
end.last&.index
if index && index < before_index
@before_index = index
end
stop_next = false
kw_count = 0
end_count = 0
index = after_lines.take_while do |line|
next false if stop_next
next true if @skip_hidden && line.hidden?
next true if @skip_empty && line.empty?
kw_count += 1 if line.is_kw?
end_count += 1 if line.is_end?
if @stop_after_kw && end_count > kw_count
stop_next = true
end
yield line
end.last&.index
if index && index > after_index
@after_index = index
end
self
end
def capture_neighbor_context
lines = []
kw_count = 0
end_count = 0
before_lines.reverse_each do |line|
next if line.empty?
break if line.indent < @orig_indent
next if line.indent != @orig_indent
kw_count += 1 if line.is_kw?
end_count += 1 if line.is_end?
if kw_count != 0 && kw_count == end_count
lines << line
break
end
lines << line
end
lines.reverse!
kw_count = 0
end_count = 0
after_lines.each do |line|
next if line.empty?
break if line.indent < @orig_indent
next if line.indent != @orig_indent
kw_count += 1 if line.is_kw?
end_count += 1 if line.is_end?
if kw_count != 0 && kw_count == end_count
lines << line
break
end
lines << line
end
lines
end
def on_falling_indent
last_indent = @orig_indent
before_lines.reverse_each do |line|
next if line.empty?
if line.indent < last_indent
yield line
last_indent = line.indent
end
end
last_indent = @orig_indent
after_lines.each do |line|
next if line.empty?
if line.indent < last_indent
yield line
last_indent = line.indent
end
end
end
def scan_neighbors
scan_while { |line| line.not_empty? && line.indent >= @orig_indent }
end
def next_up
@code_lines[before_index.pred]
end
def next_down
@code_lines[after_index.next]
end
def scan_adjacent_indent
before_after_indent = []
before_after_indent << (next_up&.indent || 0)
before_after_indent << (next_down&.indent || 0)
indent = before_after_indent.min
scan_while { |line| line.not_empty? && line.indent >= indent }
self
end
def start_at_next_line
before_index
after_index
@before_index -= 1
@after_index += 1
self
end
def code_block
CodeBlock.new(lines: lines)
end
def lines
@code_lines[before_index..after_index]
end
def before_index
@before_index ||= @orig_before_index
end
def after_index
@after_index ||= @orig_after_index
end
private def before_lines
@code_lines[0...before_index] || []
end
private def after_lines
@code_lines[after_index.next..-1] || []
end
end
end
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