diff options
Diffstat (limited to 're.c')
| -rw-r--r-- | re.c | 34 |
1 files changed, 34 insertions, 0 deletions
@@ -4194,6 +4194,39 @@ rb_reg_s_union_m(VALUE self, VALUE args) return rb_reg_s_union(self, args); } +/* + * call-seq: + * Regexp.linear_time?(re) + * Regexp.linear_time?(string, options = 0) + * + * Returns +true+ if matching against <tt>re</tt> can be + * done in linear time to the input string. + * + * Regexp.linear_time?(/re/) # => true + * + */ +static VALUE +rb_reg_s_linear_time_p(int argc, VALUE *argv, VALUE self) +{ + VALUE re; + VALUE src, opts = Qundef, n_flag = Qundef, kwargs; + + rb_scan_args(argc, argv, "12:", &src, &opts, &n_flag, &kwargs); + + if (RB_TYPE_P(src, T_REGEXP)) { + re = src; + if (opts != Qnil) { + rb_warn("flags ignored"); + } + } + else { + re = rb_class_new_instance(argc, argv, rb_cRegexp); + } + + rb_reg_check(re); + return RBOOL(onig_check_linear_time(RREGEXP_PTR(re))); +} + /* :nodoc: */ static VALUE rb_reg_init_copy(VALUE copy, VALUE re) @@ -4571,6 +4604,7 @@ Init_Regexp(void) rb_define_singleton_method(rb_cRegexp, "union", rb_reg_s_union_m, -2); rb_define_singleton_method(rb_cRegexp, "last_match", rb_reg_s_last_match, -1); rb_define_singleton_method(rb_cRegexp, "try_convert", rb_reg_s_try_convert, 1); + rb_define_singleton_method(rb_cRegexp, "linear_time?", rb_reg_s_linear_time_p, -1); rb_define_method(rb_cRegexp, "initialize", rb_reg_initialize_m, -1); rb_define_method(rb_cRegexp, "initialize_copy", rb_reg_init_copy, 1); |