LuaJIT-to-Go/batch.go

package luajit

/*
#include <lua.h>
#include <lauxlib.h>
#include <stdlib.h>
#include <string.h>

// Batch table field setting - single C call for multiple fields
int batch_set_string_fields(lua_State *L, int table_idx,
                           char **keys, char **values, int count) {
	for (int i = 0; i < count; i++) {
		lua_pushstring(L, values[i]);
		lua_setfield(L, table_idx, keys[i]);
	}
	return 0;
}

int batch_set_number_fields(lua_State *L, int table_idx,
                           char **keys, double *values, int count) {
	for (int i = 0; i < count; i++) {
		lua_pushnumber(L, values[i]);
		lua_setfield(L, table_idx, keys[i]);
	}
	return 0;
}

int batch_set_bool_fields(lua_State *L, int table_idx,
                         char **keys, int *values, int count) {
	for (int i = 0; i < count; i++) {
		lua_pushboolean(L, values[i]);
		lua_setfield(L, table_idx, keys[i]);
	}
	return 0;
}

// Batch array creation - build entire array in C
int batch_push_int_array(lua_State *L, int *values, int count) {
	lua_createtable(L, count, 0);
	for (int i = 0; i < count; i++) {
		lua_pushnumber(L, i + 1);
		lua_pushnumber(L, values[i]);
		lua_settable(L, -3);
	}
	return 0;
}

int batch_push_float_array(lua_State *L, double *values, int count) {
	lua_createtable(L, count, 0);
	for (int i = 0; i < count; i++) {
		lua_pushnumber(L, i + 1);
		lua_pushnumber(L, values[i]);
		lua_settable(L, -3);
	}
	return 0;
}

int batch_push_string_array(lua_State *L, char **values, int count) {
	lua_createtable(L, count, 0);
	for (int i = 0; i < count; i++) {
		lua_pushnumber(L, i + 1);
		lua_pushstring(L, values[i]);
		lua_settable(L, -3);
	}
	return 0;
}

int batch_push_bool_array(lua_State *L, int *values, int count) {
	lua_createtable(L, count, 0);
	for (int i = 0; i < count; i++) {
		lua_pushnumber(L, i + 1);
		lua_pushboolean(L, values[i]);
		lua_settable(L, -3);
	}
	return 0;
}

// Batch array extraction - extract entire array in C
int batch_extract_int_array(lua_State *L, int table_idx, int *buffer, int length) {
	for (int i = 1; i <= length; i++) {
		lua_pushnumber(L, i);
		lua_gettable(L, table_idx);
		buffer[i-1] = (int)lua_tonumber(L, -1);
		lua_pop(L, 1);
	}
	return 0;
}

int batch_extract_float_array(lua_State *L, int table_idx, double *buffer, int length) {
	for (int i = 1; i <= length; i++) {
		lua_pushnumber(L, i);
		lua_gettable(L, table_idx);
		buffer[i-1] = lua_tonumber(L, -1);
		lua_pop(L, 1);
	}
	return 0;
}

int batch_extract_string_array(lua_State *L, int table_idx, char **buffer, int length) {
	for (int i = 1; i <= length; i++) {
		lua_pushnumber(L, i);
		lua_gettable(L, table_idx);
		size_t len;
		const char *str = lua_tolstring(L, -1, &len);
		if (str) {
			buffer[i-1] = malloc(len + 1);
			memcpy(buffer[i-1], str, len);
			buffer[i-1][len] = '\0';
		} else {
			buffer[i-1] = malloc(1);
			buffer[i-1][0] = '\0';
		}
		lua_pop(L, 1);
	}
	return 0;
}

int batch_extract_bool_array(lua_State *L, int table_idx, int *buffer, int length) {
	for (int i = 1; i <= length; i++) {
		lua_pushnumber(L, i);
		lua_gettable(L, table_idx);
		buffer[i-1] = lua_toboolean(L, -1);
		lua_pop(L, 1);
	}
	return 0;
}
*/
import "C"
import (
	"unsafe"
)

// BatchSetStringFields sets multiple string fields on a table in one C call
func (s *State) BatchSetStringFields(tableIndex int, fields map[string]string) error {
	if len(fields) == 0 {
		return nil
	}

	keys := make([]*C.char, len(fields))
	values := make([]*C.char, len(fields))

	i := 0
	for k, v := range fields {
		keys[i] = C.CString(k)
		values[i] = C.CString(v)
		i++
	}

	C.batch_set_string_fields(s.L, C.int(tableIndex), &keys[0], &values[0], C.int(len(fields)))

	for j := range len(fields) {
		C.free(unsafe.Pointer(keys[j]))
		C.free(unsafe.Pointer(values[j]))
	}

	return nil
}

// BatchSetNumberFields sets multiple number fields on a table in one C call
func (s *State) BatchSetNumberFields(tableIndex int, fields map[string]float64) error {
	if len(fields) == 0 {
		return nil
	}

	keys := make([]*C.char, len(fields))
	values := make([]C.double, len(fields))

	i := 0
	for k, v := range fields {
		keys[i] = C.CString(k)
		values[i] = C.double(v)
		i++
	}

	C.batch_set_number_fields(s.L, C.int(tableIndex), &keys[0], &values[0], C.int(len(fields)))

	for j := range len(fields) {
		C.free(unsafe.Pointer(keys[j]))
	}

	return nil
}

// BatchSetBoolFields sets multiple boolean fields on a table in one C call
func (s *State) BatchSetBoolFields(tableIndex int, fields map[string]bool) error {
	if len(fields) == 0 {
		return nil
	}

	keys := make([]*C.char, len(fields))
	values := make([]C.int, len(fields))

	i := 0
	for k, v := range fields {
		keys[i] = C.CString(k)
		if v {
			values[i] = 1
		} else {
			values[i] = 0
		}
		i++
	}

	C.batch_set_bool_fields(s.L, C.int(tableIndex), &keys[0], &values[0], C.int(len(fields)))

	for j := range len(fields) {
		C.free(unsafe.Pointer(keys[j]))
	}

	return nil
}

// BatchPushIntArray creates and pushes an int array in a single C call
func (s *State) BatchPushIntArray(values []int) error {
	if len(values) == 0 {
		s.CreateTable(0, 0)
		return nil
	}

	cValues := make([]C.int, len(values))
	for i, v := range values {
		cValues[i] = C.int(v)
	}

	C.batch_push_int_array(s.L, &cValues[0], C.int(len(values)))
	return nil
}

// BatchPushFloatArray creates and pushes a float array in a single C call
func (s *State) BatchPushFloatArray(values []float64) error {
	if len(values) == 0 {
		s.CreateTable(0, 0)
		return nil
	}

	cValues := make([]C.double, len(values))
	for i, v := range values {
		cValues[i] = C.double(v)
	}

	C.batch_push_float_array(s.L, &cValues[0], C.int(len(values)))
	return nil
}

// BatchPushStringArray creates and pushes a string array in a single C call
func (s *State) BatchPushStringArray(values []string) error {
	if len(values) == 0 {
		s.CreateTable(0, 0)
		return nil
	}

	cValues := make([]*C.char, len(values))
	for i, v := range values {
		cValues[i] = C.CString(v)
	}

	C.batch_push_string_array(s.L, &cValues[0], C.int(len(values)))

	for i := range values {
		C.free(unsafe.Pointer(cValues[i]))
	}

	return nil
}

// BatchPushBoolArray creates and pushes a bool array in a single C call
func (s *State) BatchPushBoolArray(values []bool) error {
	if len(values) == 0 {
		s.CreateTable(0, 0)
		return nil
	}

	cValues := make([]C.int, len(values))
	for i, v := range values {
		if v {
			cValues[i] = 1
		} else {
			cValues[i] = 0
		}
	}

	C.batch_push_bool_array(s.L, &cValues[0], C.int(len(values)))
	return nil
}

// BatchExtractIntArray extracts an entire int array in a single C call
func (s *State) BatchExtractIntArray(index, length int) ([]int, error) {
	if length <= 0 {
		return []int{}, nil
	}

	buffer := make([]C.int, length)
	C.batch_extract_int_array(s.L, C.int(index), &buffer[0], C.int(length))

	result := make([]int, length)
	for i := range length {
		result[i] = int(buffer[i])
	}

	return result, nil
}

// BatchExtractFloatArray extracts an entire float array in a single C call
func (s *State) BatchExtractFloatArray(index, length int) ([]float64, error) {
	if length <= 0 {
		return []float64{}, nil
	}

	buffer := make([]C.double, length)
	C.batch_extract_float_array(s.L, C.int(index), &buffer[0], C.int(length))

	result := make([]float64, length)
	for i := range length {
		result[i] = float64(buffer[i])
	}

	return result, nil
}

// BatchExtractStringArray extracts an entire string array in a single C call
func (s *State) BatchExtractStringArray(index, length int) ([]string, error) {
	if length <= 0 {
		return []string{}, nil
	}

	buffer := make([]*C.char, length)
	C.batch_extract_string_array(s.L, C.int(index), &buffer[0], C.int(length))

	result := make([]string, length)
	for i := range length {
		result[i] = C.GoString(buffer[i])
		C.free(unsafe.Pointer(buffer[i]))
	}

	return result, nil
}

// BatchExtractBoolArray extracts an entire bool array in a single C call
func (s *State) BatchExtractBoolArray(index, length int) ([]bool, error) {
	if length <= 0 {
		return []bool{}, nil
	}

	buffer := make([]C.int, length)
	C.batch_extract_bool_array(s.L, C.int(index), &buffer[0], C.int(length))

	result := make([]bool, length)
	for i := range length {
		result[i] = buffer[i] != 0
	}

	return result, nil
}

// BatchTableBuilder provides batched table building operations
type BatchTableBuilder struct {
	state        *State
	index        int
	stringFields map[string]string
	numberFields map[string]float64
	boolFields   map[string]bool
	otherFields  map[string]any
}

// NewBatchTableBuilder creates a table builder that batches operations
func (s *State) NewBatchTableBuilder() *BatchTableBuilder {
	s.NewTable()
	return &BatchTableBuilder{
		state:        s,
		index:        s.GetTop(),
		stringFields: make(map[string]string),
		numberFields: make(map[string]float64),
		boolFields:   make(map[string]bool),
		otherFields:  make(map[string]any),
	}
}

// SetString queues a string field for batch setting
func (tb *BatchTableBuilder) SetString(key, value string) *BatchTableBuilder {
	tb.stringFields[key] = value
	return tb
}

// SetNumber queues a number field for batch setting
func (tb *BatchTableBuilder) SetNumber(key string, value float64) *BatchTableBuilder {
	tb.numberFields[key] = value
	return tb
}

// SetBool queues a boolean field for batch setting
func (tb *BatchTableBuilder) SetBool(key string, value bool) *BatchTableBuilder {
	tb.boolFields[key] = value
	return tb
}

// SetNil sets a nil field immediately
func (tb *BatchTableBuilder) SetNil(key string) *BatchTableBuilder {
	tb.state.PushNil()
	tb.state.SetField(tb.index, key)
	return tb
}

// SetTable sets a table field immediately
func (tb *BatchTableBuilder) SetTable(key string, value any) *BatchTableBuilder {
	tb.otherFields[key] = value
	return tb
}

// SetArray sets an array field immediately
func (tb *BatchTableBuilder) SetArray(key string, values []any) *BatchTableBuilder {
	tb.otherFields[key] = values
	return tb
}

// Build executes all batched operations and finalizes the table
func (tb *BatchTableBuilder) Build() error {
	// Batch string fields
	if len(tb.stringFields) > 0 {
		if err := tb.state.BatchSetStringFields(tb.index, tb.stringFields); err != nil {
			return err
		}
	}

	// Batch number fields
	if len(tb.numberFields) > 0 {
		if err := tb.state.BatchSetNumberFields(tb.index, tb.numberFields); err != nil {
			return err
		}
	}

	// Batch boolean fields
	if len(tb.boolFields) > 0 {
		if err := tb.state.BatchSetBoolFields(tb.index, tb.boolFields); err != nil {
			return err
		}
	}

	// Individual operations for complex types
	for key, value := range tb.otherFields {
		if err := tb.state.PushValue(value); err != nil {
			return err
		}
		tb.state.SetField(tb.index, key)
	}

	return nil
}