forked from sheetjs/docs.sheetjs.com
117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
/* sheetjs-hermesw.cpp Copyright (c) SheetJS LLC. */
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#include <iostream>
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#include "hermes/hermes.h"
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static char *read_file(const char *filename, size_t *sz) {
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FILE *f = fopen(filename, "rb");
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if(!f) return NULL;
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long fsize; { fseek(f, 0, SEEK_END); fsize = ftell(f); fseek(f, 0, SEEK_SET); }
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char *buf = (char *)malloc(fsize * sizeof(char));
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*sz = fread((void *) buf, 1, fsize, f);
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fclose(f);
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return buf;
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}
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/* Hermes-Windows requires the null terminator */
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static char *read_file_null(const char *filename, size_t *sz) {
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FILE *f = fopen(filename, "rb");
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if(!f) return NULL;
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long fsize; { fseek(f, 0, SEEK_END); fsize = ftell(f) + 1; fseek(f, 0, SEEK_SET); }
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char *buf = (char *)malloc(fsize * sizeof(char));
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*sz = fread((void *) buf, 1, fsize, f);
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buf[fsize - 1] = 0;
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fclose(f);
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return buf;
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}
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/* Unfortunately the library provides no C-friendly Buffer classes */
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class CBuffer : public facebook::jsi::Buffer {
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public:
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CBuffer(const uint8_t *data, size_t size) : buf(data), sz(size) {}
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size_t size() const override { return sz; }
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const uint8_t *data() const override { return buf; }
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private:
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const uint8_t *buf;
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size_t sz;
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};
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/* ArrayBuffer constructor expects MutableBuffer*/
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class CMutableBuffer : public facebook::jsi::MutableBuffer {
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public:
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CMutableBuffer(uint8_t *data, size_t size) : buf(data), sz(size) {}
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size_t size() const override { return sz; }
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uint8_t *data() override { return buf; }
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private:
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uint8_t *buf;
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size_t sz;
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};
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int main(int argc, char **argv) {
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std::unique_ptr<facebook::jsi::Runtime> rt(facebook::hermes::makeHermesRuntime());
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/* setup */
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try {
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auto src = std::make_shared<facebook::jsi::StringBuffer>(
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"var global = (function(){ return this; }).call(null);"
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"var console = { log: function(x) { print(x); } };"
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);
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auto js = rt->prepareJavaScript(src, std::string("<eval>"));
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rt->evaluatePreparedJavaScript(js);
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} catch (const facebook::jsi::JSIException &e) {
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std::cerr << "JavaScript terminated via uncaught exception: " << e.what() << '\n';
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return 1;
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}
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/* load SheetJS library */
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try {
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size_t sz; char *xlsx_full_min_js = read_file_null("xlsx.full.min.js", &sz);
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auto src = std::make_shared<CBuffer>(CBuffer((uint8_t *)xlsx_full_min_js, sz));
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auto js = rt->prepareJavaScript(src, std::string("xlsx.full.min.js"));
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rt->evaluatePreparedJavaScript(js);
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} catch (const facebook::jsi::JSIException &e) {
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std::cerr << "JavaScript terminated via uncaught exception: " << e.what() << '\n';
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return 1;
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}
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/* print library version */
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try {
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auto src = std::make_shared<facebook::jsi::StringBuffer>(
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"console.log('SheetJS Library Version: ' + XLSX.version)"
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);
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auto js = rt->prepareJavaScript(src, std::string("<eval>"));
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rt->evaluatePreparedJavaScript(js);
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} catch (const facebook::jsi::JSIException &e) {
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std::cerr << "JavaScript terminated via uncaught exception: " << e.what() << '\n';
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return 1;
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}
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try {
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/* load payload as ArrayBuffer */
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size_t sz; char *data = read_file(argv[1], &sz);
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auto payload = std::make_shared<CMutableBuffer>(CMutableBuffer((uint8_t *)data, sz));
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auto ab = facebook::jsi::ArrayBuffer(*rt, payload);
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/* define stub function to read and convert first sheet to CSV */
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auto src = std::make_shared<facebook::jsi::StringBuffer>(
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"(function(buf) {"
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"var wb = XLSX.read(buf);"
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"return XLSX.utils.sheet_to_csv(wb.Sheets[wb.SheetNames[0]]);"
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"})"
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);
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auto js = rt->prepareJavaScript(src, std::string("<eval>"));
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auto func = rt->evaluatePreparedJavaScript(js);
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/* call stub function and capture result */
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auto csv = func.asObject(*rt).asFunction(*rt).call(*rt, ab);
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/* interpret as utf8 and print to stdout */
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std::string str = csv.getString(*rt).utf8(*rt);
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std::cout << str << std::endl;
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} catch (const facebook::jsi::JSIException &e) {
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std::cerr << "JavaScript terminated via uncaught exception: " << e.what() << std::endl;
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return 1;
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}
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return 0;
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} |