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Contents
# frozen_string_literal: true
require "ripper"
module Primer
module Forms
# :nodoc:
class BufferRewriter < Ripper
class << self
def rewrite(code)
parser = new(code, "(code)", 0)
parser.parse
line_offsets = calc_line_offsets(code)
code.dup.tap do |result|
parser.var_refs.reverse_each do |lineno, stop|
line_offset = line_offsets[lineno]
stop += line_offset
stop -= 1 if stop < code.length
start = stop - "@output_buffer".length
result[start...stop] = "output_buffer"
end
end
end
private
def calc_line_offsets(code)
idx = -1
[0].tap do |offsets|
while (idx = code.index(/\r?\n/, idx + 1))
offsets << Regexp.last_match.end(0)
end
end
end
end
def on_var_ref(var)
return unless var == "@output_buffer"
var_refs << [lineno, column]
end
def var_refs
@var_refs ||= []
end
end
end
end
Version data entries
175 entries across 175 versions & 2 rubygems