ruby/enc/trans/newline.trans

#include "transcode_data.h"

<%
  map_normalize = {}
  map_normalize["{00-ff}"] = :func_so
%>

<%= transcode_generate_node(ActionMap.parse(map_normalize), "universal_newline") %>

static int
fun_so_universal_newline(rb_transcoding* t, const unsigned char* s, size_t l, unsigned char* o)
{
    int len;
    /*
      t->stateful[0] == 0       : normal
      t->stateful[0] == 1       : just after '\r'
    */
    if (s[0] == '\n') {
        if (t->stateful[0] == 0) {
            o[0] = '\n';
            len = 1;
        }
        else {
            len = 0;
        }
        t->stateful[0] = 0;
    }
    else if (s[0] == '\r') {
        o[0] = '\n';
        len = 1;
        t->stateful[0] = 1;
    }
    else {
        o[0] = s[0];
        len = 1;
        t->stateful[0] = 0;
    }
    return len;
}

static const rb_transcoder
rb_universal_newline = {
    "universal_newline", "", &universal_newline,
    1, /* input_unit_length */
    1, /* max_input */
    1, /* max_output */
    NULL, NULL, NULL, fun_so_universal_newline
};

<%
  map_crlf = {}
  map_crlf["{00-09,0b-ff}"] = :nomap
  map_crlf["0a"] = "0d0a"
%>

<%= transcode_generate_node(ActionMap.parse(map_crlf), "crlf_newline") %>

static const rb_transcoder
rb_crlf_newline = {
    "", "crlf_newline", &crlf_newline,
    1, /* input_unit_length */
    1, /* max_input */
    2, /* max_output */
    NULL, NULL, NULL, NULL
};

<%
  map_cr = {}
  map_cr["{00-09,0b-ff}"] = :nomap
  map_cr["0a"] = "0d"
%>

<%= transcode_generate_node(ActionMap.parse(map_cr), "cr_newline") %>

static const rb_transcoder
rb_cr_newline = {
    "", "cr_newline", &cr_newline,
    1, /* input_unit_length */
    1, /* max_input */
    1, /* max_output */
    NULL, NULL, NULL, NULL
};

void
Init_newline(void)
{
    rb_register_transcoder(&rb_universal_newline);
    rb_register_transcoder(&rb_crlf_newline);
    rb_register_transcoder(&rb_cr_newline);
}