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<-- license:BSD-3-Clause
-- copyright-holders:MAMEdev Team
---------------------------------------------------------------------------
--
-- lib.lua
--
-- Rules for building lib cores
--
---------------------------------------------------------------------------
project "utils"
uuid "22489ad0-4cb2-4d91-ad81-24b0d80ca30a"
kind (LIBTYPE)
addprojectflags()
includedirs {
MAME_DIR .. "src/osd",
MAME_DIR .. "src/lib/util",
MAME_DIR .. "3rdparty",
ext_includedir("expat"),
ext_includedir("zlib"),
ext_includedir("flac"),
ext_includedir("utf8proc"),
}
files {
MAME_DIR .. "src/lib/util/bitstream.h",
MAME_DIR .. "src// license:GPL-2.0+
// copyright-holders:Couriersud
#include "pfunction.h"
#include "pexception.h"
#include "pfmtlog.h"
#include "pmath.h"
#include "pstonum.h"
#include "pstrutil.h"
#include "putil.h"
#include <stack>
#include <type_traits>
namespace plib {
template <typename NT>
void pfunction<NT>::compile(const pstring &expr, const inputs_container &inputs) noexcept(false)
{
if (plib::startsWith(expr, "rpn:"))
compile_postfix(expr.substr(4), inputs);
else
compile_infix(expr, inputs);
}
template <typename NT>
void pfunction<NT>::compile_postfix(const pstring &expr, const inputs_container &inputs) noexcept(false)
{
std::vector<pstring> cmds(plib::psplit(expr, " "));
compile_postfix(inputs, cmds, expr);
}
template <typename NT>
void pfunction<NT>::compile_postfix(const inputs_container &inputs,
const std::vector<pstring> &cmds, const pstring &expr) noexcept(false)
{
m_precompiled.clear();
int stk = 0;
for (const pstring &cmd : cmds)
{
rpn_inst rc;
if (cmd == "+")
{ rc.m_cmd = ADD; stk -= 1; }
else if (cmd == "-")
{ rc.m_cmd = SUB; stk -= 1; }
else if (cmd == "*")
{ rc.m_cmd = MULT; stk -= 1; }
else if (cmd == "/")
{ rc.m_cmd = DIV; stk -= 1; }
else if (cmd == "pow")
{ rc.m_cmd = POW; stk -= 1; }
else if (cmd == "sin")
{ rc.m_cmd = SIN; stk -= 0; }
else if (cmd == "cos")
{ rc.m_cmd = COS; stk -= 0; }
else if (cmd == "max")
{ rc.m_cmd = MAX; stk -= 1; }
else if (cmd == "min")
{ rc.m_cmd = MIN; stk -= 1; }
else if (cmd == "trunc")
{ rc.m_cmd = TRUNC; stk -= 0; }
else if (cmd == "rand")
{ rc.m_cmd = RAND; stk += 1; }
else
{
for (std::size_t i = 0; i < inputs.size(); i++)
{
if (inputs[i] == cmd)
{
rc.m_cmd = PUSH_INPUT;
rc.m_param = static_cast<NT>(i);
stk += 1;
break;
}
}
if (rc.m_cmd != PUSH_INPUT)
{
rc.m_cmd = PUSH_CONST;
bool err(false);
rc.m_param = plib::pstonum_ne<decltype(rc.m_param)>(cmd, err);
if (err)
throw pexception(plib::pfmt("pfunction: unknown/misformatted token <{1}> in <{2}>")(cmd)(expr));
stk += 1;
}
}
if (stk < 1)
throw pexception(plib::pfmt("pfunction: stack underflow on token <{1}> in <{2}>")(cmd)(expr));
m_precompiled.push_back(rc);
}
if (stk != 1)
throw pexception(plib::pfmt("pfunction: stack count different to one on <{2}>")(expr));
}
static int get_prio(const pstring &v)
{
if (v == "(" || v == ")")
return 1;
if (plib::left(v, 1) >= "a" && plib::left(v, 1) <= "z")
return 0;
if (v == "*" || v == "/")
return 20;
if (v == "+" || v == "-")
return 10;
if (v == "^")
return 30;
return -1;
}
static pstring pop_check(std::stack<pstring> &stk, const pstring &expr) noexcept(false)
{
if (stk.empty())
throw pexception(plib::pfmt("pfunction: stack underflow during infix parsing of: <{1}>")(expr));
pstring res = stk.top();
stk.pop();
return res;
}
template <typename NT>
void pfunction<NT>::compile_infix(const pstring &expr, const inputs_container &inputs)
{
// Shunting-yard infix parsing
std::vector<pstring> sep = {"(", ")", ",", "*", "/", "+", "-", "^"};
std::vector<pstring> sexpr1(plib::psplit(plib::replace_all(expr, " ", ""), sep));
std::stack<pstring> opstk;
std::vector<pstring> postfix;
std::vector<pstring> sexpr;
// FIXME: We really need to switch to ptokenizer and fix negative number
// handling in ptokenizer.
// Fix numbers
for (std::size_t i = 0; i < sexpr1.size(); )
{
if ((i == 0) && (sexpr1.size() > 1) && (sexpr1[0] == "-")
&& (plib::left(sexpr1[1],1) >= "0") && (plib::left(sexpr1[1],1) <= "9"))
{
if (sexpr1.size() < 4)
{
sexpr.push_back(sexpr1[0] + sexpr1[1]);
i+=2;
}
else
{
auto r(plib::right(sexpr1[1], 1));
auto ne(sexpr1[2]);
if ((r == "e" || r == "E") && (ne == "-" || ne == "+"))
{
sexpr.push_back(sexpr1[0] + sexpr1[1] + ne + sexpr1[3]);
i+=4;
}
else
{
sexpr.push_back(sexpr1[0] + sexpr1[1]);
i+=2;
}
}
}
else if (i + 2 < sexpr1.size() && sexpr1[i].length() > 1)
{
auto l(plib::left(sexpr1[i], 1));
auto r(plib::right(sexpr1[i], 1));
auto ne(sexpr1[i+1]);
if ((l >= "0") && (l <= "9") && (r == "e" || r == "E") && (ne == "-" || ne == "+"))
{
sexpr.push_back(sexpr1[i] + ne + sexpr1[i+2]);
i+=3;
}
else
sexpr.push_back(sexpr1[i++]);
}
else
sexpr.push_back(sexpr1[i++]);
}
for (std::size_t i = 0; i < sexpr.size(); i++)
{
pstring &s = sexpr[i];
if (s=="(")
opstk.push(s);
else if (s==")")
{
pstring x = pop_check(opstk, expr);
while (x != "(")
{
postfix.push_back(x);
x = pop_check(opstk, expr);
}
if (!opstk.empty() && get_prio(opstk.top()) == 0)
postfix.push_back(pop_check(opstk, expr));
}
else if (s==",")
{
pstring x = pop_check(opstk, expr);
while (x != "(")
{
postfix.push_back(x);
x = pop_check(opstk, expr);
}
opstk.push(x);
}
else {
int p = get_prio(s);
if (p>0)
{
if (opstk.empty())
opstk.push(s);
else
{
if (get_prio(opstk.top()) >= get_prio(s))
postfix.push_back(pop_check(opstk, expr));
opstk.push(s);
}
}
else if (p == 0) // Function or variable
{
if ((i+1<sexpr.size()) && sexpr[i+1] == "(")
opstk.push(s);
else
postfix.push_back(s);
}
else
postfix.push_back(s);
}
}
while (!opstk.empty())
{
postfix.push_back(opstk.top());
opstk.pop();
}
//printf("e : %s\n", expr.c_str());
//for (auto &s : postfix)
// printf("x : %s\n", s.c_str());
compile_postfix(inputs, postfix, expr);
}
template <typename NT>
static inline typename std::enable_if<plib::is_floating_point<NT>::value, NT>::type
lfsr_random(std::uint16_t &lfsr) noexcept
{
std::uint16_t lsb = lfsr & 1;
lfsr >>= 1;
if (lsb)
lfsr ^= 0xB400U; // taps 15, 13, 12, 10
return static_cast<NT>(lfsr) / static_cast<NT>(0xffffU);
}
template <typename NT>
static inline typename std::enable_if<plib::is_integral<NT>::value, NT>::type
lfsr_random(std::uint16_t &lfsr) noexcept
{
std::uint16_t lsb = lfsr & 1;
lfsr >>= 1;
if (lsb)
lfsr ^= 0xB400U; // taps 15, 13, 12, 10
return static_cast<NT>(lfsr);
}
#define ST1 stack[ptr]
#define ST2 stack[ptr-1]
#define OP(OP, ADJ, EXPR) \
case OP: \
ptr-= (ADJ); \
stack[ptr-1] = (EXPR); \
break;
template <typename NT>
NT pfunction<NT>::evaluate(const values_container &values) noexcept
{
std::array<value_type, 20> stack = { plib::constants<value_type>::zero() };
unsigned ptr = 0;
stack[0] = plib::constants<value_type>::zero();
for (auto &rc : m_precompiled)
{
switch (rc.m_cmd)
{
OP(ADD, 1, ST2 + ST1)
OP(MULT, 1, ST2 * ST1)
OP(SUB, 1, ST2 - ST1)
OP(DIV, 1, ST2 / ST1)
OP(POW, 1, plib::pow(ST2, ST1))
OP(SIN, 0, plib::sin(ST2))
OP(COS, 0, plib::cos(ST2))
OP(MAX, 1, std::max(ST2, ST1))
OP(MIN, 1, std::min(ST2, ST1))
OP(TRUNC, 0, plib::trunc(ST2))
case RAND:
stack[ptr++] = lfsr_random<value_type>(m_lfsr);
break;
case PUSH_INPUT:
stack[ptr++] = values[static_cast<unsigned>(rc.m_param)];
break;
case PUSH_CONST:
stack[ptr++] = rc.m_param;
break;
}
}
return stack[ptr-1];
}
template class pfunction<float>;
template class pfunction<double>;
template class pfunction<long double>;
#if (PUSE_FLOAT128)
template class pfunction<FLOAT128>;
#endif
} // namespace plib
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