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Contents
# frozen_string_literal: true
module Parser
module Lexer::Explanation
def self.included(klass)
klass.class_exec do
alias_method :state_before_explanation=, :state=
alias_method :advance_before_explanation, :advance
remove_method :state=, :advance
end
end
# Like #advance, but also pretty-print the token and its position
# in the stream to `stdout`.
def advance
type, (val, range) = advance_before_explanation
more = "(in-kwarg)" if @context.in_kwarg
puts decorate(range,
Color.green("#{type} #{val.inspect}"),
"#{state.to_s.ljust(12)} #{@cond} #{@cmdarg} #{more}")
[ type, [val, range] ]
end
def state=(new_state)
puts " #{Color.yellow(">>> STATE SET <<<", bold: true)} " +
"#{new_state.to_s.ljust(12)} #{@cond} #{@cmdarg}".rjust(66)
self.state_before_explanation = new_state
end
private
def decorate(range, token, info)
from, to = range.begin.column, range.end.column
line = range.source_line + ' '
line[from...to] = Color.underline(line[from...to])
tail_len = to - from - 1
tail = '~' * (tail_len >= 0 ? tail_len : 0)
decoration = "#{" " * from}#{Color.red("^#{tail}", bold: true)} #{token} ".
ljust(68) + info
[ line, decoration ]
end
end
end
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