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@pervognsen

pervognsen/str.ion

Last active Oct 19, 2019
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import libc {...}
struct StrLinesIter {
next: char const*;
start: char const*;
end: char const*;
}
func str_lines(str: char const*): StrLinesIter {
return {next = str};
}
func str_lines_next(iter: StrLinesIter*): bool {
if (!*iter.next) {
return false;
}
iter.start = iter.next;
iter.end = iter.next;
while (*iter.end && *iter.end != '\n') {
iter.end++;
}
iter.next = *iter.end ? iter.end + 1 : iter.end;
return true;
}
struct StrWordsIter {
next: char const*;
start: char const*;
end: char const*;
}
func str_words(str: char const*): StrWordsIter {
return {next = str};
}
func str_words_next(iter: StrWordsIter*): bool {
iter.start = iter.next;
while (isspace(*iter.start)) {
iter.start++;
}
if (!*iter.start) {
return false;
}
iter.end = iter.start;
while (*iter.end && !isspace(*iter.end)) {
iter.end++;
}
iter.next = *iter.end ? iter.end + 1 : iter.end;
return true;
}
struct StrTokensIter {
next: char const*;
delims: char const*;
start: char const*;
end: char const*;
}
func str_tokens(str: char const*, delims: char const*): StrTokensIter {
return {next = str, delims = delims};
}
func str_contains(str: char const*, c: char): bool {
while (*str) {
if (*str == c) {
return true;
}
str++;
}
return false;
}
func str_tokens_next(iter: StrTokensIter*): bool {
iter.start = iter.next;
while (str_contains(iter.delims, *iter.start)) {
iter.start++;
}
if (!*iter.start) {
return false;
}
iter.end = iter.start;
while (*iter.end && !str_contains(iter.delims, *iter.end)) {
iter.end++;
}
iter.next = *iter.end ? iter.end + 1 : iter.end;
return true;
}
func main(argc: int, argv: char**): int {
str := " first\n\n \nsecond\nthird";
for (it := str_lines(str); str_lines_next(&it)) {
printf("'%.*s'\n", it.end - it.start, it.start);
}
str = " first second\r third\n\t fourth ";
for (it := str_words(str); str_words_next(&it)) {
printf("'%.*s'\n", it.end - it.start, it.start);
}
for (it := str_tokens(str, " \t\n\r"); str_tokens_next(&it)) {
printf("'%.*s'\n", it.end - it.start, it.start);
}
return 0;
}
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