docs.sheetjs.com/docz/static/v8/sheetjs.v8.cc
2023-05-20 22:11:51 -04:00

107 lines
3.7 KiB
C++

/* sheetjs.v8 (C) SheetJS -- https://sheetjs.com */
/* based on the official V8 samples ("BSD-3-Clause") */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "include/libplatform/libplatform.h"
#include "include/v8.h"
static char *read_file(const char *filename, size_t *sz) {
FILE *f = fopen(filename, "rb");
if(!f) return NULL;
long fsize; { fseek(f, 0, SEEK_END); fsize = ftell(f); fseek(f, 0, SEEK_SET); }
char *buf = (char *)malloc(fsize * sizeof(char));
*sz = fread((void *) buf, 1, fsize, f);
fclose(f);
return buf;
}
v8::Local<v8::Value> eval_code(v8::Isolate *isolate, v8::Local<v8::Context> context, char* code) {
v8::Local<v8::String> source = v8::String::NewFromUtf8(isolate, code).ToLocalChecked();
v8::Local<v8::Script> script = v8::Script::Compile(context, source).ToLocalChecked();
return script->Run(context).ToLocalChecked();
}
#define EVAL_CODE(x) eval_code(isolate, context, (char *)x)
int main(int argc, char* argv[]) {
/* initialize -- this part is from the hello world example */
v8::V8::InitializeICUDefaultLocation(argv[0]);
v8::V8::InitializeExternalStartupData(argv[0]);
std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
v8::V8::InitializePlatform(platform.get());
v8::V8::Initialize();
v8::Isolate::CreateParams create_params;
create_params.array_buffer_allocator = v8::ArrayBuffer::Allocator::NewDefaultAllocator();
v8::Isolate* isolate = v8::Isolate::New(create_params);
{
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = v8::Context::New(isolate);
v8::Context::Scope context_scope(context);
/* load library */
{
/* read file */
size_t sz; char *file = read_file("xlsx.full.min.js", &sz);
if(!file) { perror("Error reading xlsx.full.min.js"); return 1; }
/* evaluate */
v8::Local<v8::Value> result = EVAL_CODE(file);
/* free */
free(file);
}
/* get version string */
{
v8::Local<v8::Value> result = EVAL_CODE("XLSX.version");
v8::String::Utf8Value vers(isolate, result);
printf("SheetJS library version %s\n", *vers);
}
/* read file */
{
/* read bytes */
size_t sz; char *file = read_file(argv[1], &sz);
if(!file) { perror("Error reading file"); return 1; }
/* copy into array buffer and assign to `buf` in the global scope */
{
std::unique_ptr<v8::BackingStore> back = v8::ArrayBuffer::NewBackingStore(isolate, sz);
memcpy(back->Data(), file, sz);
v8::Local<v8::ArrayBuffer> ab = v8::ArrayBuffer::New(isolate, std::move(back));
v8::Maybe<bool> res = context->Global()->Set(context, v8::String::NewFromUtf8Literal(isolate, "buf"), ab);
}
printf("Loaded file %s\n", argv[1]);
}
/* parse workbook and assign to global `wb` property */
{
v8::Local<v8::Value> result = EVAL_CODE("globalThis.wb = XLSX.read(buf)");
}
/* print CSV of first worksheet */
{
v8::Local<v8::Value> result = EVAL_CODE("XLSX.utils.sheet_to_csv(wb.Sheets[wb.SheetNames[0]])");
v8::String::Utf8Value csv(isolate, result);
printf("%s\n", *csv);
}
// write sheetjsw.xlsb
{
v8::Local<v8::Value> result = EVAL_CODE("XLSX.write(wb, {type:'array', bookType:'xlsb'})");
v8::Local<v8::ArrayBuffer> ab = v8::Local<v8::ArrayBuffer>::Cast(result);
FILE *f = fopen("sheetjsw.xlsb", "wb"); fwrite((char *)ab->Data(), 1, ab->ByteLength(), f); fclose(f);
}
}
/* cleanup -- this part is from the hello world example */
isolate->Dispose();
v8::V8::Dispose();
v8::V8::DisposePlatform();
delete create_params.array_buffer_allocator;
return 0;
}