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#pragma once
#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <utility>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*x))
struct line_view {
const char* line;
size_t length;
line_view(const char* s = nullptr) : line(s) { length = s == nullptr ? 0 : strlen(s); }
line_view(const char* s, size_t l) : line(s), length(l) {}
line_view(const char* p1, const char* p2) : line(p1), length(p2 - p1 + 1) {}
friend std::ostream& operator<<(std::ostream& o, const line_view& lv) {
for (size_t i = 0; i < lv.length; i++) {
o << lv.line[i];
}
return o;
}
bool operator==(const line_view& lv) const noexcept {
const char* p1 = line;
const char* p2 = lv.line;
const char* p3 = p1 + length;
if (length != lv.length) {
return false;
}
while (p1 < p3) {
if (*p1++ != *p2++) {
return false;
}
}
return true;
}
const char* contains(const line_view& lv) const noexcept {
const char* p1 = line;
const char* p2 = line + length;
if (length < lv.length) {
return nullptr;
}
while (p1 + lv.length <= p2) {
if (*p1 == *lv.line) {
line_view x{p1, lv.length};
if (x == lv) {
return p1;
}
}
p1++;
}
return nullptr;
}
bool operator==(const char* l) const noexcept {
size_t i = 0;
while (i < this->length) {
if (l[i] != this->line[i]) {
return false;
}
i++;
}
return l[i] == '\0';
}
const char* contains(const char* s) const noexcept {
size_t len = strlen(s);
const char* p = line;
while (p + len <= line + length) {
if (*p == *s) {
line_view x{p, len};
if (x == s) {
return p;
}
}
p++;
}
return nullptr;
}
};
line_view load_file(const char*);
line_view next_line(line_view, size_t*);
template <typename F, typename... Args>
void per_line(line_view file, F&& f, Args&&... args) {
size_t offset = 0;
line_view lv;
do {
lv = next_line(file, &offset);
if (!f(lv, std::forward<Args>(args)...)) {
break;
}
} while (offset < file.length);
}
template <typename F, typename... Args>
void per_char(line_view line, F&& f, Args&&... args) {
for (size_t i = 0; i < line.length; i++) {
if (!f(line.line[i], std::forward<Args>(args)...)) {
break;
}
}
}
struct ascii_count {
int count[256];
ascii_count(line_view lv) : count{0} {
per_char(lv, [this](char c) {
count[static_cast<int>(c)] += 1;
return true;
});
}
int operator[](char c) const noexcept { return count[static_cast<int>(c)]; }
friend std::ostream& operator<<(std::ostream& o, const ascii_count& ac) {
for (size_t i = 0; i < 256; i++) {
if (ac.count[i] > 0) {
o << i << " -> " << ac.count[i] << "\n";
}
}
return o;
}
};
bool is_repeated(const char* p1, const char* p2);
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