docs.sheetjs.com/docz/static/duk/SheetJSDuk.py

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2024-01-30 09:27:22 +00:00
#!/usr/bin/env python3
lib = "libduktape.207.20700.so"
from ctypes import CDLL, byref, string_at, c_int, c_void_p, c_char_p, c_size_t
duk = CDLL(lib)
def str_to_c(s):
b = s.encode("utf8")
return [c_char_p(b), len(b)]
def duk_create_heap_default():
duk.duk_create_heap.restype = c_void_p
return duk.duk_create_heap(None, None, None, None, None)
def duk_eval_string_noresult(ctx, cmd):
[s, l] = str_to_c(cmd)
return duk.duk_eval_raw(ctx, s, l, 1 | (1<<3) | (1<<9) | (1<<10) | (1<<8) | (1<<11) )
def duk_eval_string(ctx, cmd):
[s, l] = str_to_c(cmd)
return duk.duk_eval_raw(ctx, s, l, 0 | (1<<3) | (1<<9) | (1<<10) | (1<<11) )
def duk_peval(ctx):
return duk.duk_eval_raw(ctx, None, 0, 1 | (1<<3) | (1<<7) | (1<<11) )
def duk_get_string(ctx, idx):
duk.duk_get_string.restype = c_char_p
retval = duk.duk_get_string(ctx, idx)
return retval.decode("utf8")
def eval_file(ctx, path):
with open(path, "r") as f:
code = f.read()
[s, l] = str_to_c(code)
duk.duk_push_lstring(ctx, s, l)
retval = duk_peval(ctx)
duk.duk_pop(ctx)
return retval
def load_file(ctx, path, var):
with open(path, "rb") as f:
data = f.read()
ptr = c_char_p(data)
duk.duk_push_buffer_raw(ctx, 0, 1 | 2)
duk.duk_config_buffer(ctx, -1, ptr, len(data))
duk.duk_put_global_string(ctx, str_to_c(var)[0])
return data
def save_file(ctx, path, var):
duk.duk_get_global_string(ctx, str_to_c(var)[0])
sz = c_size_t()
duk.duk_get_buffer_data.restype = c_void_p
buf = duk.duk_get_buffer_data(ctx, -1, byref(sz))
s = string_at(buf, sz.value)
with open(path, "wb") as f:
f.write(s)
def process(path):
# initialize
context = duk_create_heap_default()
ctx = c_void_p(context)
def DOIT(cmd):
return duk_eval_string_noresult(ctx, cmd)
# duktape does not expose a standard "global" by default
DOIT("var global = (function(){ return this; }).call(null);")
# load library
eval_file(ctx, "shim.min.js")
eval_file(ctx, "xlsx.full.min.js")
# get version string
duk_eval_string(ctx, "XLSX.version")
print("SheetJS Library Version %s" % (duk_get_string(ctx, -1)))
duk.duk_pop(ctx)
# read file
# NOTE: data is captured here to avoid GC
data = load_file(ctx, path, "buf")
print("Loaded file %s" % (path))
# parse workbook
DOIT("wb = XLSX.read(buf.slice(0, buf.length));")
DOIT("ws = wb.Sheets[wb.SheetNames[0]]")
# print CSV
duk_eval_string(ctx, "XLSX.utils.sheet_to_csv(ws)")
print(duk_get_string(ctx, -1))
duk.duk_pop(ctx)
DOIT("newbuf = (XLSX.write(wb, {type:'buffer', bookType:'xlsb'}));")
save_file(ctx, "sheetjsw.xlsb", "newbuf")
duk.duk_destroy_heap(ctx)
return 0
if("__main__" == __name__):
from sys import argv
process(argv[1])