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string_operations.cpp
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167 lines (148 loc) · 3.81 KB
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/* Copyright (c) 2024 Julian Benda
*
* This file is part of inkCPP which is released under MIT license.
* See file LICENSE.txt or go to
* https://github.com/JBenda/inkcpp for full license details.
*/
/// implementation for commands on strings
/// string_cast is a class which convert an value to a string.
/// if the value is already a string it dose nothing (just serve the pointer),
/// else it convert the value to a string and store it, in it internal storage.
#include "stack.h"
#include "value.h"
#include "string_utils.h"
#include "operations.h"
#include "string_table.h"
namespace ink::runtime::internal
{
namespace casting
{
/**
* @brief Wrapper to cast values to string.
* string representation is stored inside string_cast.
*/
class string_cast
{
public:
string_cast(const value& val);
const char* get() const { return _str; }
private:
const value& _val;
const char* _str;
char _data[512]; // TODO define central
};
// constructor for string_cast class
string_cast::string_cast(const value& val)
: _val{val}
, _str{nullptr}
{
if (val.type() == value_type::string) {
// reference string if value is already a string
_str = val.get<value_type::string>();
} else {
// convert else
_str = _data;
toStr(_data, 512, val);
}
}
} // namespace casting
void operation<Command::ADD, value_type::string, void>::operator()(
basic_eval_stack& stack, value* vals
)
{
// convert values to strings
casting::string_cast lh(vals[0]);
casting::string_cast rh(vals[1]);
// create new string with needed size
char* str = _string_table.create(c_str_len(lh.get()) + c_str_len(rh.get()) + 1);
// copy to new string
char* dst = str;
for (const char* src = lh.get(); *src; ++src) {
*dst++ = *src;
}
for (const char* src = rh.get(); *src; ++src) {
*dst++ = *src;
}
*dst = 0;
stack.push(value{}.set<value_type::string>(str));
}
void operation<Command::IS_EQUAL, value_type::string, void>::operator()(
basic_eval_stack& stack, value* vals
)
{
// convert values to string
casting::string_cast lh(vals[0]);
casting::string_cast rh(vals[1]);
// compare strings char wise
const char* li = lh.get();
const char* ri = rh.get();
while (*li && *ri && *li == *ri) {
++li;
++ri;
}
stack.push(value{}.set<value_type::boolean>(*li == *ri));
}
void operation<Command::NOT_EQUAL, value_type::string, void>::operator()(
basic_eval_stack& stack, value* vals
)
{
// convert values to string
casting::string_cast lh(vals[0]);
casting::string_cast rh(vals[1]);
// compare strings char wise
const char* li = lh.get();
const char* ri = rh.get();
while (*li && *ri && *li == *ri) {
++li;
++ri;
}
stack.push(value{}.set<value_type::boolean>(*li != *ri));
}
bool has(const char* lh, const char* rh)
{
while (isspace(static_cast<unsigned char>(*lh))) {
++lh;
}
while (isspace(static_cast<unsigned char>(*rh))) {
++rh;
}
if (! *lh && ! *rh) {
return true;
}
for (const char* li = lh; *li; ++li) {
const char* ri = rh;
bool match = true;
int offset = 0;
for (int i = 0; ri[i] != 0; ++i) {
if (li[i + offset] != ri[i]) {
if (isspace(static_cast<unsigned char>(ri[i]))) {
--offset;
continue;
}
match = false;
break;
}
}
if (match) {
return true;
}
}
return false;
}
void operation<Command::HAS, value_type::string, void>::operator()(
basic_eval_stack& stack, value* vals
)
{
casting::string_cast lh(vals[0]);
casting::string_cast rh(vals[1]);
stack.push(value{}.set<value_type::boolean>(has(lh.get(), rh.get())));
}
void operation<Command::HASNT, value_type::string, void>::operator()(
basic_eval_stack& stack, value* vals
)
{
casting::string_cast lh(vals[0]);
casting::string_cast rh(vals[1]);
stack.push(value{}.set<value_type::boolean>(! has(lh.get(), rh.get())));
}
} // namespace ink::runtime::internal