Re: End-of-line characters in long strings
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- Subject: Re: End-of-line characters in long strings
- From: Taco Hoekwater <taco@...>
- Date: 2008年1月19日 07:53:15 +0100
Doug Rogers wrote:
Doug Rogers wrote:
When loading source code the parser can treat any of CR/LF/CR-LF as
newline, but embedded long strings should not be modified.
On reading this I realized that I wasn't clear. I meant that the parser
can treat CR/LF/CR-LF as newlines for the purpose of line number
reporting. But otherwise I think it should take a hands-off approach.
luatex has a patched version liolib.c just for this issue.
The new read_line is a bit slower, but it is line-ending agnostic:
static int read_line (lua_State *L, FILE *f) {
luaL_Buffer buf;
int c, d;
luaL_buffinit(L, &buf);
while (1) {
c = fgetc(f);
if (c == EOF) {
luaL_pushresult(&buf); /* close buffer */
return (lua_strlen(L, -1) > 0); /* check read something */
};
if (c == '\n') {
break;
} else if (c == '\r') {
d = fgetc(f);
if (d != EOF && d != '\n')
ungetc(d,f);
break;
} else {
luaL_addchar(&buf,c);
}
}
luaL_pushresult(&buf); /* close buffer */
return 1;
}
Best wishes,
Taco