367 lines
10 KiB
C++
367 lines
10 KiB
C++
/* String for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OCTA_STRING_H
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#define OCTA_STRING_H
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#include <stdio.h>
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#include <stddef.h>
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#include "octa/utility.h"
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#include "octa/range.h"
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#include "octa/vector.h"
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namespace octa {
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using std::initializer_list;
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static constexpr size_t npos = -1;
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template<typename T>
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class StringBase {
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Vector<T> p_buf;
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void terminate() {
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if (p_buf.empty() || (p_buf.back() != '\0')) p_buf.push('\0');
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}
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public:
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typedef size_t SizeType;
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typedef ptrdiff_t DiffType;
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typedef T ValType;
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typedef T &RefType;
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typedef const T &ConstRefType;
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typedef T *PtrType;
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typedef const T *ConstPtrType;
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typedef PointerRange< T> RangeType;
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typedef PointerRange<const T> ConstRangeType;
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StringBase(): p_buf(1, '\0') {}
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StringBase(const StringBase &s): p_buf(s.p_buf) {}
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StringBase(StringBase &&s): p_buf(move(s.p_buf)) {}
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StringBase(const StringBase &s, size_t pos, size_t len = npos):
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p_buf(s.p_buf.each().slice(pos,
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(len == npos) ? s.p_buf.size() : (pos + len))) {
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terminate();
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}
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/* TODO: traits for utf-16/utf-32 string lengths, for now assume char */
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StringBase(const T *v): p_buf(PointerRange<const T>(v, strlen(v) + 1)) {}
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template<typename R> StringBase(R range): p_buf(range) {
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terminate();
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}
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void clear() { p_buf.clear(); }
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StringBase<T> &operator=(const StringBase &v) {
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p_buf.operator=(v);
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return *this;
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}
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StringBase<T> &operator=(StringBase &&v) {
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p_buf.operator=(move(v));
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return *this;
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}
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StringBase<T> &operator=(const T *v) {
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p_buf = PointerRange<const T>(v, strlen(v) + 1);
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return *this;
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}
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void resize(size_t n, T v = T()) {
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p_buf.pop();
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p_buf.resize(n, v);
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terminate();
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}
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void reserve(size_t n) {
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p_buf.reserve(n + 1);
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}
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T &operator[](size_t i) { return p_buf[i]; }
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const T &operator[](size_t i) const { return p_buf[i]; }
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T &at(size_t i) { return p_buf[i]; }
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const T &at(size_t i) const { return p_buf[i]; }
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T &front() { return p_buf[0]; }
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const T &front() const { return p_buf[0]; };
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T &back() { return p_buf[size() - 1]; }
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const T &back() const { return p_buf[size() - 1]; }
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T *data() { return p_buf.data(); }
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const T *data() const { return p_buf.data(); }
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size_t size() const {
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return p_buf.size() - 1;
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}
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size_t capacity() const {
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return p_buf.capacity() - 1;
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}
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bool empty() const { return (size() == 0); }
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void push(T v) {
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p_buf.back() = v;
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p_buf.push('\0');
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}
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StringBase<T> &append(const StringBase &s) {
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p_buf.pop();
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p_buf.insert_range(p_buf.size(), s.p_buf.each());
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return *this;
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}
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StringBase<T> &append(const StringBase &s, size_t idx, size_t len) {
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p_buf.pop();
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p_buf.insert_range(p_buf.size(), PointerRange<T>(&s[idx],
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(len == npos) ? (s.size() - idx) : len));
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terminate();
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return *this;
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}
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StringBase<T> &append(const T *s) {
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p_buf.pop();
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p_buf.insert_range(p_buf.size(), PointerRange<const T>(s,
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strlen(s) + 1));
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return *this;
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}
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StringBase<T> &append(size_t n, T c) {
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p_buf.pop();
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for (size_t i = 0; i < n; ++i) p_buf.push(c);
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p_buf.push('\0');
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return *this;
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}
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template<typename R>
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StringBase<T> &append_range(R range) {
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p_buf.pop();
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p_buf.insert_range(p_buf.size(), range);
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terminate();
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return *this;
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}
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StringBase<T> &operator+=(const StringBase &s) {
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return append(s);
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}
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StringBase<T> &operator+=(const T *s) {
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return append(s);
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}
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StringBase<T> &operator+=(T c) {
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p_buf.pop();
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p_buf.push(c);
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p_buf.push('\0');
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return *this;
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}
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RangeType each() {
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return PointerRange<T>(p_buf.data(), size());
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}
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ConstRangeType each() const {
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return PointerRange<const T>(p_buf.data(), size());
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}
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void swap(StringBase &v) {
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p_buf.swap(v);
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}
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};
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typedef StringBase<char> String;
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template<typename T>
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struct __OctaIsRangeTest {
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template<typename U> static char __octa_test(typename U::Category *);
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template<typename U> static int __octa_test(...);
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static constexpr bool value = (sizeof(__octa_test<T>(0)) == sizeof(char));
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};
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template<typename T, typename F>
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String concat(const T &v, const String &sep, F func) {
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String ret;
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auto range = each(v);
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if (range.empty()) return move(ret);
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for (;;) {
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ret += func(range.front());
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range.pop_front();
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if (range.empty()) break;
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ret += sep;
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}
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return move(ret);
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}
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template<typename T>
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String concat(const T &v, const String &sep = " ") {
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String ret;
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auto range = each(v);
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if (range.empty()) return move(ret);
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for (;;) {
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ret += range.front();
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range.pop_front();
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if (range.empty()) break;
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ret += sep;
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}
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return move(ret);
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}
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template<typename T, typename F>
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String concat(initializer_list<T> v, const String &sep, F func) {
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return concat(each(v), sep, func);
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}
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template<typename T>
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String concat(initializer_list<T> v, const String &sep = " ") {
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return concat(each(v), sep);
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}
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template<typename T>
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struct __OctaToStringTest {
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template<typename U, String (U::*)() const> struct __OctaTest {};
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template<typename U> static char __octa_test(__OctaTest<U, &U::to_string> *);
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template<typename U> static int __octa_test(...);
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static constexpr bool value = (sizeof(__octa_test<T>(0)) == sizeof(char));
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};
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template<typename T> struct ToString {
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typedef T ArgType;
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typedef String ResultType;
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template<typename U>
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static String __octa_to_str(const U &v,
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EnableIf<__OctaToStringTest<U>::value, bool> = true
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) {
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return v.to_string();
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}
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template<typename U>
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static String __octa_to_str(const U &v,
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EnableIf<!__OctaToStringTest<U>::value && !IsScalar<U>::value,
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bool> = true
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) {
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String ret("{");
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ret += concat(each(v), ", ", ToString<RangeReference<
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decltype(each(v))
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>>());
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ret += "}";
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return move(ret);
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}
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template<typename U>
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static String __octa_to_str(const U &v,
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EnableIf<!__OctaToStringTest<U>::value && IsScalar<U>::value,
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bool> = true
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) {
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return ToString<U>()(v);
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}
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String operator()(const T &v) {
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return move(__octa_to_str<RemoveCv<RemoveReference<T>>>(v));
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}
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};
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template<typename T>
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void __octa_str_printf(Vector<char> *s, const char *fmt, T v) {
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char buf[256];
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int n = snprintf(buf, sizeof(buf), fmt, v);
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s->clear();
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s->reserve(n + 1);
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if (n >= (int)sizeof(buf))
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snprintf(s->data(), n + 1, fmt, v);
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else if (n > 0)
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memcpy(s->data(), buf, n + 1);
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else {
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n = 0;
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*(s->data()) = '\0';
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}
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*(((size_t *)s) + 1) = n + 1;
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}
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template<> struct ToString<bool> {
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typedef bool ArgType;
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typedef String ResultType;
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String operator()(bool b) {
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return b ? "true" : "false";
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}
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};
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template<> struct ToString<char> {
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typedef char ArgType;
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typedef String ResultType;
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String operator()(char c) {
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String ret;
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ret.push(c);
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return move(ret);
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}
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};
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#define __OCTA_TOSTR_NUM(T, fmt) \
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template<> struct ToString<T> { \
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typedef T ArgType; \
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typedef String ResultType; \
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String operator()(T v) { \
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String ret; \
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__octa_str_printf((Vector<char> *)&ret, fmt, v); \
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return move(ret); \
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} \
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};
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__OCTA_TOSTR_NUM(int, "%d")
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__OCTA_TOSTR_NUM(int &, "%d")
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__OCTA_TOSTR_NUM(uint, "%u")
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__OCTA_TOSTR_NUM(long, "%ld")
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__OCTA_TOSTR_NUM(ulong, "%lu")
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__OCTA_TOSTR_NUM(llong, "%lld")
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__OCTA_TOSTR_NUM(ullong, "%llu")
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__OCTA_TOSTR_NUM(float, "%f")
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__OCTA_TOSTR_NUM(double, "%f")
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__OCTA_TOSTR_NUM(ldouble, "%Lf")
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#undef __OCTA_TOSTR_NUM
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template<typename T> struct ToString<T *> {
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typedef T *ArgType;
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typedef String ResultType;
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String operator()(ArgType v) {
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String ret;
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__octa_str_printf((Vector<char> *)&ret, "%p", v);
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return move(ret);
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}
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};
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template<> struct ToString<String> {
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typedef const String &ArgType;
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typedef String ResultType;
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String operator()(ArgType s) {
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return s;
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}
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};
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template<typename T, typename U> struct ToString<Pair<T, U>> {
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typedef const Pair<T, U> &ArgType;
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typedef String ResultType;
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String operator()(ArgType v) {
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String ret("{");
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ret += ToString<RemoveCv<RemoveReference<T>>>()(v.first);
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ret += ", ";
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ret += ToString<RemoveCv<RemoveReference<U>>>()(v.second);
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ret += "}";
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return move(ret);
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}
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};
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template<typename T>
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String to_string(const T &v) {
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return move(ToString<RemoveCv<RemoveReference<T>>>()(v));
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}
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template<typename T>
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String to_string(initializer_list<T> init) {
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return move(ToString<initializer_list<T>>()(init));
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}
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}
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#endif |