Class: String

Inherits:

Object

• Object
• String

Defined in:

(unknown)

Instance Method Summary

• #underscore ⇒ Object

  Makes an underscored, lowercase form from the expression in the string.

Instance Method Details

#underscore ⇒ Object

Makes an underscored, lowercase form from the expression in the string.

Changes ‘::’ to ‘/’ to convert namespaces to paths.

underscore('ActiveModel')         # => "active_model"
underscore('ActiveModel::Errors') # => "active_model/errors"

As a rule of thumb you can think of underscore as the inverse of #camelize, though there are cases where that does not hold:

camelize(underscore('SSLError'))  # => "SslError"

# File 'ext/fast_underscore/fast_underscore.c', line 300

static VALUE underscore(VALUE string) {
  char segment[RSTRING_LEN(string) * 2 * sizeof(unsigned int) * 2];
  char result[RSTRING_LEN(string) * 2 * sizeof(unsigned int) * 2];

  builder_t builder = {
    .state = STATE_DEFAULT,
    .segment = segment,
    .result = result,
    .segment_size = 0,
    .result_size = 0,
    .push_next = 0
  };

  codepoint_t codepoint = {
    .encoding = rb_enc_from_index(ENCODING_GET(string)),
    .character = 0,
    .size = 0
  };

  char *pointer = RSTRING_PTR(string);
  char *end = RSTRING_END(string);

  while (pointer < end) {
    codepoint.character = rb_enc_codepoint_len(pointer, end, &codepoint.size, codepoint.encoding);
    builder_next(&builder, &codepoint);
    pointer += codepoint.size;
  }

  builder_flush(&builder);
  return rb_enc_str_new(builder.result, builder.result_size, codepoint.encoding);
}