mirror of
https://github.com/NoelFB/blah.git
synced 2024-11-25 16:18:57 +08:00
371 lines
8.2 KiB
C++
371 lines
8.2 KiB
C++
#pragma once
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#include <blah_common.h>
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#include <blah_vector.h>
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#include <blah_stackvector.h>
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namespace Blah
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{
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class BaseString
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{
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public:
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const char* cstr() const { return s_ptr(); }
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char* cstr() { return s_ptr(); }
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const char* begin() const { return s_ptr(); }
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char* begin() { return s_ptr(); }
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const char* end() const { return s_ptr() + length(); }
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char* end() { return s_ptr() + length(); }
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char& operator[](int index)
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{
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BLAH_ASSERT(index >= 0 && index < length() + 1, "Index out of range");
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return s_ptr()[index];
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}
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const char& operator[](int index) const
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{
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BLAH_ASSERT(index >= 0 && index < length() + 1, "Index out of range");
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return s_ptr()[index];
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}
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operator char* () { return cstr(); }
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operator const char* () const { return cstr(); }
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void assign(const char* cstr, const char* cstr_end = nullptr);
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void append(const char* cstr, const char* cstr_end = nullptr);
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void append(const u16* u16_cstr, const u16* u16_cstr_end = nullptr, bool swap_endian = false);
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void append(char ch, int count = 1);
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void append(u32 unicode);
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void append_fmt(const char* fmt, ...);
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bool starts_with(const char* cstr, bool ignore_case = false) const;
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bool ends_with(const char* cstr, bool ignore_case = false) const;
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bool contains(const char* cstr, bool ignore_case = false) const;
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int first_index_of(char ch) const;
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int last_index_of(char ch) const;
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int length() const
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{
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int n = s_len() - 1; // reduce by 1 for null-terminator
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return (n > 0 ? n : 0); // safety, although due to how StackString is implemented s_len shouldn't ever be less than 1
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}
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bool equals(const char* other, bool ignore_case = false) const;
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bool empty() const { return length() == 0; }
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void clear() { s_clear(); }
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bool operator==(const char* rhs) const { return equals(rhs); }
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bool operator!=(const char* rhs) const { return !(*this == rhs); }
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bool operator==(const BaseString& rhs) const { return s_len() == rhs.s_len() && *this == rhs.cstr(); }
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bool operator!=(const BaseString& rhs) const { return !(*this == rhs); }
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protected:
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virtual void s_clear() = 0;
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virtual void s_ensure(int capacity) = 0;
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virtual char* s_ptr() = 0;
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virtual const char* s_ptr() const = 0;
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virtual int s_len() const = 0;
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};
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template<size_t StackSize>
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class StackString final : public BaseString
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{
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public:
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StackString() { assign(""); }
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StackString(const char* cstr, const char* cstr_end = nullptr) { assign(cstr, cstr_end); }
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StackString(const BaseString& other) { assign(other.cstr()); }
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StackString& operator=(const BaseString& rhs)
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{
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assign(rhs.cstr(), rhs.cstr() + rhs.length());
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return *this;
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}
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StackString& operator=(const char* rhs)
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{
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assign(rhs, nullptr);
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return *this;
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}
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StackString& operator+=(const BaseString& rhs)
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{
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append(rhs.cstr());
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return *this;
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}
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StackString& operator+=(const char* rhs)
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{
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append(rhs);
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return *this;
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}
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StackString& operator+=(const char& rhs)
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{
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append(rhs);
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return *this;
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}
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StackString operator+(const BaseString& rhs)
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{
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StackString str(*this);
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str += rhs;
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return str;
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}
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StackString operator+(const char* rhs)
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{
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StackString str(*this);
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str += rhs;
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return str;
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}
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StackString operator+(const char& rhs)
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{
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StackString str(*this);
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str += rhs;
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return str;
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}
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StackString substr(int start, int len = 0) const
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{
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if (len == 0) len = length() - start;
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return StackString(cstr() + start, cstr() + start + len);
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}
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StackString trim() const
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{
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if (length() > 0)
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{
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const char* s = begin();
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const char* e = end() - 1;
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while (s < e && (*s == ' ' || *s == '\t' || *s == '\r' || *s == '\n' || *s == '\v' || *s == '\f')) s++;
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while (e > s && (*e == ' ' || *e == '\t' || *e == '\r' || *e == '\n' || *e == '\v' || *e == '\f')) e--;
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return StackString(s, e + 1);
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}
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return StackString();
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}
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Vector<StackString> split(char ch) const
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{
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Vector<StackString> result;
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const char* ptr = s_ptr();
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const char* end = ptr + length();
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const char* last = ptr;
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while (ptr < end)
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{
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if (*ptr == ch)
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{
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result.emplace_back(last, ptr);
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last = ptr + 1;
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}
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ptr++;
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}
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if (last < ptr)
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result.emplace_back(last, ptr);
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return result;
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}
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static StackString fmt(const char* fmt, ...)
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{
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StackString str;
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va_list args;
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// determine arg m_length
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va_start(args, fmt);
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auto add = vsnprintf(nullptr, 0, fmt, args);
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va_end(args);
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if (add <= 0)
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return str;
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// reserve (+1 for null-terminator)
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auto len = str.length();
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str.s_ensure(len + add + 1);
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// print out
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va_start(args, fmt);
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vsnprintf(str.s_ptr() + len, add + 1, fmt, args);
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va_end(args);
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return str;
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}
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protected:
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void s_clear() override
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{
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m_stack_buffer.clear();
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m_heap_buffer.clear();
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s_ensure(1);
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}
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void s_ensure(int capacity) override
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{
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int count = capacity - s_len();
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if (count <= 0)
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return;
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// expand heap buffer
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if (m_heap_buffer.size() > 0)
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{
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m_heap_buffer.expand(count);
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}
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// switch from stack to heap
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else if (capacity > StackSize)
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{
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m_heap_buffer.expand(capacity);
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char* src = m_stack_buffer.data();
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char* len = src + m_stack_buffer.size();
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char* dst = m_heap_buffer.data();
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while (src < len) *(dst++) = *(src++);
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}
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// expand stack buffer
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else
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{
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m_stack_buffer.expand(count);
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}
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*(s_ptr() + s_len() - 1) = '\0';
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}
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char* s_ptr() override
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{
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return m_heap_buffer.size() > 0 ? m_heap_buffer.data() : m_stack_buffer.data();
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}
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const char* s_ptr() const override
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{
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return m_heap_buffer.size() > 0 ? m_heap_buffer.data() : m_stack_buffer.data();
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}
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int s_len() const override
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{
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return m_heap_buffer.size() > 0 ? m_heap_buffer.size() : m_stack_buffer.size();
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}
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private:
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Vector<char> m_heap_buffer;
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StackVector<char, StackSize> m_stack_buffer;
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};
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template<size_t StackSize>
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StackString<StackSize> operator+(const StackString<StackSize>& lhs, const BaseString& rhs)
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{
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StackString str(lhs);
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str += rhs;
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return str;
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}
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template<size_t StackSize>
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StackString<StackSize> operator+(const StackString<StackSize>& lhs, const char* rhs)
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{
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StackString str(lhs);
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str += rhs;
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return str;
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}
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template<size_t StackSize>
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StackString<StackSize> operator+(const StackString<StackSize>& lhs, const char& rhs)
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{
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StackString str(lhs);
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str += rhs;
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return str;
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}
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// Stores enough for an empty string on the stack, and afterwards allocates on the heap
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using HeapString = StackString<1>;
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// Standard String with a fair amount of stack storage
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using String = StackString<64>;
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// Large String with enough stack storage to store FilePaths without allocating.
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using FilePath = StackString<260>;
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// Utf8 Utility, to iterate over a string and read utf-8 characters
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struct Utf8
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{
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const char* str = nullptr;
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u32 character = 0;
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u32 character_size = 0;
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Utf8() = default;
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Utf8(const char* cstr);
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// moves to the next character, returns false if at end of string or an invalid character
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bool next();
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};
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struct CaseInsenstiveStringHash
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{
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std::size_t operator()(const Blah::BaseString& key) const
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{
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std::size_t result = 2166136261U;
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for (auto& it : key)
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{
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if (it >= 'A' && it <= 'Z')
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result ^= (static_cast<std::size_t>(it) - 'A' + 'a');
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else
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result ^= static_cast<std::size_t>(it);
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result *= 16777619U;
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}
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return result;
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}
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};
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struct CaseInsenstiveStringCompare
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{
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bool operator() (const BaseString& lhs, const BaseString& rhs) const
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{
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return lhs.length() == rhs.length() && lhs.starts_with(rhs, true);
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}
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};
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}
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// STD Hash Utility, so the String can be used in a set / unordered_map / map
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namespace std
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{
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template <>
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struct hash<Blah::BaseString>
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{
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std::size_t operator()(const Blah::BaseString& key) const
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{
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std::size_t result = 2166136261U;
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for (auto& it : key)
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{
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result ^= static_cast<std::size_t>(it);
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result *= 16777619U;
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}
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return result;
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}
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};
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template <size_t StackSize>
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struct hash<Blah::StackString<StackSize>>
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{
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std::size_t operator()(const Blah::StackString<StackSize>& key) const
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{
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std::size_t result = 2166136261U;
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for (auto& it : key)
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{
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result ^= static_cast<std::size_t>(it);
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result *= 16777619U;
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}
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return result;
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}
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};
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} |