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# frozen_string_literal: true
require 'hamlit/ruby_expression'
module Hamlit
class StaticAnalyzer < Temple::Filter
STATIC_TOKENS = %i[
on_tstring_beg on_tstring_end on_tstring_content
on_embexpr_beg on_embexpr_end
on_lbracket on_rbracket
on_qwords_beg on_words_sep on_qwords_sep
on_lparen on_rparen
on_lbrace on_rbrace on_label
on_int on_float on_imaginary
on_comma on_sp
].freeze
DYNAMIC_TOKENS = %i[
on_ident on_period
].freeze
STATIC_KEYWORDS = %w[
true false nil
].freeze
STATIC_OPERATORS = %w[
=>
].freeze
def self.static?(code)
return false if code.nil? || code.strip.empty?
return false if RubyExpression.syntax_error?(code)
Ripper.lex(code).each do |(_, col), token, str|
case token
when *STATIC_TOKENS
# noop
when :on_kw
return false unless STATIC_KEYWORDS.include?(str)
when :on_op
return false unless STATIC_OPERATORS.include?(str)
when *DYNAMIC_TOKENS
return false
else
return false
end
end
true
end
def on_dynamic(code)
if StaticAnalyzer.static?(code)
[:static, eval(code).to_s]
else
[:dynamic, code]
end
end
end
end
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