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# frozen_string_literal: true
module SyntaxSuggest
# Multiple lines form a singular CodeBlock
#
# Source code is made of multiple CodeBlocks.
#
# Example:
#
# code_block.to_s # =>
# # def foo
# # puts "foo"
# # end
#
# code_block.valid? # => true
# code_block.in_valid? # => false
#
#
class CodeBlock
UNSET = Object.new.freeze
attr_reader :lines, :starts_at, :ends_at
def initialize(lines: [])
@lines = Array(lines)
@valid = UNSET
@deleted = false
@starts_at = @lines.first.number
@ends_at = @lines.last.number
end
def delete
@deleted = true
end
def deleted?
@deleted
end
def visible_lines
@lines.select(&:visible?).select(&:not_empty?)
end
def mark_invisible
@lines.map(&:mark_invisible)
end
def is_end?
to_s.strip == "end"
end
def hidden?
@lines.all?(&:hidden?)
end
# This is used for frontier ordering, we are searching from
# the largest indentation to the smallest. This allows us to
# populate an array with multiple code blocks then call `sort!`
# on it without having to specify the sorting criteria
def <=>(other)
out = current_indent <=> other.current_indent
return out if out != 0
# Stable sort
starts_at <=> other.starts_at
end
def current_indent
@current_indent ||= lines.select(&:not_empty?).map(&:indent).min || 0
end
def invalid?
!valid?
end
def valid?
if @valid == UNSET
# Performance optimization
#
# If all the lines were previously hidden
# and we expand to capture additional empty
# lines then the result cannot be invalid
#
# That means there's no reason to re-check all
# lines with the parser (which is expensive).
# Benchmark in commit message
@valid = if lines.all? { |l| l.hidden? || l.empty? }
true
else
SyntaxSuggest.valid?(lines.map(&:original).join)
end
else
@valid
end
end
def to_s
@lines.join
end
end
end
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