sheetjs-clone/demos/altjs/sheetjs.duk.c

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "duktape.h"
#define FAIL_LOAD { \
duk_push_undefined(ctx); \
perror("Error in load_file"); \
return 1; \
}
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;
}
static duk_int_t eval_file(duk_context *ctx, const char *filename) {
size_t len; char *buf = read_file(filename, &len);
if(!buf) FAIL_LOAD
duk_push_lstring(ctx, (const char *)buf, (duk_size_t)len);
duk_int_t retval = duk_peval(ctx);
duk_pop(ctx);
return retval;
}
static duk_int_t load_file(duk_context *ctx, const char *filename, const char *var) {
size_t len; char *buf = read_file(filename, &len);
if(!buf) FAIL_LOAD
duk_push_external_buffer(ctx);
duk_config_buffer(ctx, -1, buf, len);
duk_put_global_string(ctx, var);
return 0;
}
static duk_int_t save_file(duk_context *ctx, const char *filename, const char *var) {
duk_get_global_string(ctx, var);
duk_size_t sz;
char *buf = (char *)duk_get_buffer_data(ctx, -1, &sz);
if(!buf) return 1;
FILE *f = fopen(filename, "wb"); fwrite(buf, 1, sz, f); fclose(f);
return 0;
}
#define FAIL(cmd) { \
printf("error in %s: %s\n", cmd, duk_safe_to_string(ctx, -1)); \
duk_destroy_heap(ctx); \
return res; \
}
#define DOIT(cmd) duk_eval_string_noresult(ctx, cmd);
int main(int argc, char *argv[]) {
duk_int_t res = 0;
/* initialize */
duk_context *ctx = duk_create_heap_default();
/* duktape does not expose a standard "global" by default */
DOIT("var global = (function(){ return this; }).call(null);");
/* load library */
res = eval_file(ctx, "xlsx.duktape.js");
if(res != 0) FAIL("library load")
/* get version string */
duk_eval_string(ctx, "XLSX.version");
printf("SheetJS library version %s\n", duk_get_string(ctx, -1));
duk_pop(ctx);
/* read file */
res = load_file(ctx, "sheetjs.xlsx", "buf");
if(res != 0) FAIL("load sheetjs.xlsx")
/* parse workbook */
DOIT("wb = XLSX.read(buf, {type:'buffer'});");
DOIT("ws = wb.Sheets[wb.SheetNames[0]]");
/* print CSV */
duk_eval_string(ctx, "XLSX.utils.sheet_to_csv(ws)");
printf("%s\n", duk_get_string(ctx, -1));
duk_pop(ctx);
/* change cell A1 to 3 */
DOIT("ws['A1'].v = 3; delete ws['A1'].w;");
/* write file */
DOIT("newbuf = XLSX.write(wb, {type:'buffer', bookType:'xlsx'})");
res = save_file(ctx, "sheetjsw.xlsx", "newbuf");
if(res != 0) FAIL("save sheetjsw.xlsx")
/* cleanup */
duk_destroy_heap(ctx);
return res;
}