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#!/usr/bin/env python3
from contextlib import redirect_stdout
def format_array(array):
result = []
for value in array:
if value < 0 or value == 0x80:
result.append('0x80')
else:
result.append(str(value))
return ', '.join(result)
def assure_array_length(array, size, value=0x80):
while len(array) < size:
array.append(value)
def utf32_to_utf16le():
for mask in range(16):
src = 0
arr = []
for bit in [0x01, 0x02, 0x04, 0x08]:
if mask & bit:
arr.append(src + 0)
arr.append(src + 1)
arr.append(src + 2)
arr.append(src + 3)
else:
arr.append(src + 0)
arr.append(src + 1)
src += 4
assure_array_length(arr, 16)
yield arr
def utf32_to_utf16be():
for mask in range(16):
src = 0
arr = []
for bit in [0x01, 0x02, 0x04, 0x08]:
if mask & bit:
arr.append(src + 1)
arr.append(src + 0)
arr.append(src + 3)
arr.append(src + 2)
else:
arr.append(src + 1)
arr.append(src + 0)
src += 4
assure_array_length(arr, 16)
yield arr
CPP_HEADER = """// file generated by scripts/sse_convert_utf32_to_utf16.py
#ifndef SIMDUTF_UTF32_TO_UTF16_TABLES_H
#define SIMDUTF_UTF32_TO_UTF16_TABLES_H
namespace simdutf {
namespace {
namespace tables {
namespace utf32_to_utf16 {
"""
CPP_FOOTER = """} // utf16_to_utf8 namespace
} // tables namespace
} // unnamed namespace
} // namespace simdutf
#endif // SIMDUTF_UTF16_TO_UTF8_TABLES_H
"""
def main():
with open('utf32_to_utf16_tables.h', 'wt') as f:
with redirect_stdout(f):
print(CPP_HEADER)
print("const uint8_t pack_utf32_to_utf16le[16][16] = {")
for row in utf32_to_utf16le():
print("{%s}," % format_array(row))
print("};")
print()
print("const uint8_t pack_utf32_to_utf16be[16][16] = {")
for row in utf32_to_utf16be():
print("{%s}," % format_array(row))
print("};")
print()
print(CPP_FOOTER)
if __name__ == '__main__':
main()
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