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#include "lua.h"
#include "lauxlib.h"
#define CR '\xD'
#define LF '\xA'
#define CRLF "\xD\xA"
#define candidate(c) (c == CR || c == LF)
static int pushchar(int c, int last, const char *marker,
luaL_Buffer *buffer) {
if (candidate(c)) {
if (candidate(last)) {
if (c == last)
luaL_addstring(buffer, marker);
return 0;
} else {
luaL_addstring(buffer, marker);
return c;
}
} else {
luaL_putchar(buffer, c);
return 0;
}
}
static int eol(lua_State *L) {
int context = luaL_checkint(L, 1);
size_t isize = 0;
const char *input = luaL_optlstring(L, 2, NULL, &isize);
const char *last = input + isize;
const char *marker = luaL_optstring(L, 3, CRLF);
luaL_Buffer buffer;
luaL_buffinit(L, &buffer);
if (!input) {
lua_pushnil(L);
lua_pushnumber(L, 0);
return 2;
}
while (input < last)
context = pushchar(*input++, context, marker, &buffer);
luaL_pushresult(&buffer);
lua_pushnumber(L, context);
return 2;
}
static luaL_reg func[] = {
{ "eol", eol },
{ NULL, NULL }
};
int luaopen_gem(lua_State *L) {
luaL_openlib(L, "gem", func, 0);
return 0;
}
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