/**
* raptor_string_escaped_write:
* @string: UTF-8 string to write
* @len: length of UTF-8 string
* @delim: Terminating delimiter character for string (such as " or >) or \0 for no escaping.
* @flags: bit flags - see #raptor_escaped_write_bitflags
* @iostr: #raptor_iostream to write to
*
* Write a UTF-8 string formatted using different escapes to a #raptor_iostream
*
* Supports writing escapes in the Python, N-Triples, Turtle, JSON, mKR,
* SPARQL styles to an iostream.
*
* Return value: non-0 on failure such as bad UTF-8 encoding.
**/
int
raptor_string_escaped_write(const unsigned char *string,
size_t len,
const char delim,
unsigned int flags,
raptor_iostream *iostr)
{
unsigned char c;
int unichar_len;
raptor_unichar unichar;
if(!string)
return 1;
for(; (c=*string); string++, len--) {
if((delim && c == delim && (delim == '\'' || delim == '"')) ||
c == '\\') {
raptor_iostream_write_byte('\\', iostr);
raptor_iostream_write_byte(c, iostr);
continue;
}
if(delim && c == delim) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(c, 4, iostr);
continue;
}
if(flags & RAPTOR_ESCAPED_WRITE_BITFLAG_SPARQL_URI_ESCAPES) {
/* Must escape #x00-#x20<>\"{}|^` */
if(c <= 0x20 ||
c == '<' || c == '>' || c == '\\' || c == '"' ||
c == '{' || c == '}' || c == '|' || c == '^' || c == '`') {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(c, 4, iostr);
continue;
} else if(c < 0x7f) {
raptor_iostream_write_byte(c, iostr);
continue;
}
}
if(flags & RAPTOR_ESCAPED_WRITE_BITFLAG_BS_ESCAPES_TNRU) {
if(c == 0x09) {
raptor_iostream_counted_string_write("\\t", 2, iostr);
continue;
} else if(c == 0x0a) {
raptor_iostream_counted_string_write("\\n", 2, iostr);
continue;
} else if(c == 0x0d) {
raptor_iostream_counted_string_write("\\r", 2, iostr);
continue;
} else if(c < 0x20 || c == 0x7f) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(c, 4, iostr);
continue;
}
}
if(flags & RAPTOR_ESCAPED_WRITE_BITFLAG_BS_ESCAPES_BF) {
if(c == 0x08) {
/* JSON has \b for backspace */
raptor_iostream_counted_string_write("\\b", 2, iostr);
continue;
} else if(c == 0x0b) {
/* JSON has \f for formfeed */
raptor_iostream_counted_string_write("\\f", 2, iostr);
continue;
}
}
/* Just format remaining characters */
if(c < 0x7f) {
raptor_iostream_write_byte(c, iostr);
continue;
}
/* It is unicode */
unichar_len = raptor_unicode_utf8_string_get_char(string, len, &unichar);
if(unichar_len < 0 || RAPTOR_GOOD_CAST(size_t, unichar_len) > len)
/* UTF-8 encoding had an error or ended in the middle of a string */
return 1;
if(flags & RAPTOR_ESCAPED_WRITE_BITFLAG_UTF8) {
/* UTF-8 is allowed so no need to escape */
raptor_iostream_counted_string_write(string, unichar_len, iostr);
} else {
if(unichar < 0x10000) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(RAPTOR_GOOD_CAST(unsigned int, unichar), 4, iostr);
} else {
raptor_iostream_counted_string_write("\\U", 2, iostr);
raptor_iostream_hexadecimal_write(RAPTOR_GOOD_CAST(unsigned int, unichar), 8, iostr);
}
}
/**
* raptor_string_python_write:
* @string: UTF-8 string to write
* @len: length of UTF-8 string
* @delim: Terminating delimiter character for string (such as " or >)
* or \0 for no escaping.
* @flags: flags 0=N-Triples mode, 1=Turtle (allow raw UTF-8), 2=Turtle long string (allow raw UTF-8), 3=JSON
* @iostr: #raptor_iostream to write to
*
* Write a UTF-8 string using Python-style escapes (N-Triples, Turtle, JSON) to an iostream.
*
* Return value: non-0 on failure such as bad UTF-8 encoding.
**/
int
raptor_string_python_write(const unsigned char *string,
size_t len,
const char delim,
int flags,
raptor_iostream *iostr)
{
unsigned char c;
int unichar_len;
raptor_unichar unichar;
if(flags < 0 || flags > 3)
return 1;
for(; (c=*string); string++, len--) {
if((delim && c == delim && (delim == '\'' || delim == '"')) ||
c == '\\') {
raptor_iostream_write_byte('\\', iostr);
raptor_iostream_write_byte(c, iostr);
continue;
}
if(delim && c == delim) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(c, 4, iostr);
continue;
}
if(flags != 2) {
/* N-Triples, Turtle or JSON */
/* Note: NTriples is ASCII */
if(c == 0x09) {
raptor_iostream_counted_string_write("\\t", 2, iostr);
continue;
} else if((flags == 3) && c == 0x08) {
/* JSON has \b for backspace */
raptor_iostream_counted_string_write("\\b", 2, iostr);
continue;
} else if(c == 0x0a) {
raptor_iostream_counted_string_write("\\n", 2, iostr);
continue;
} else if((flags == 3) && c == 0x0b) {
/* JSON has \f for formfeed */
raptor_iostream_counted_string_write("\\f", 2, iostr);
continue;
} else if(c == 0x0d) {
raptor_iostream_counted_string_write("\\r", 2, iostr);
continue;
} else if(c < 0x20|| c == 0x7f) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(c, 4, iostr);
continue;
} else if(c < 0x80) {
raptor_iostream_write_byte(c, iostr);
continue;
}
} else if(c < 0x80) {
/* Turtle long string has no escapes except delim */
raptor_iostream_write_byte(c, iostr);
continue;
}
/* It is unicode */
unichar_len = raptor_unicode_utf8_string_get_char(string, len, NULL);
if(unichar_len < 0 || unichar_len > (int)len)
/* UTF-8 encoding had an error or ended in the middle of a string */
return 1;
if(flags >= 1 && flags <= 3) {
/* Turtle and JSON are UTF-8 - no need to escape */
raptor_iostream_counted_string_write(string, unichar_len, iostr);
} else {
unichar_len = raptor_unicode_utf8_string_get_char(string, len, &unichar);
if(unichar < 0x10000) {
raptor_iostream_counted_string_write("\\u", 2, iostr);
raptor_iostream_hexadecimal_write(unichar, 4, iostr);
} else {
raptor_iostream_counted_string_write("\\U", 2, iostr);
raptor_iostream_hexadecimal_write(unichar, 8, iostr);
}
}
unichar_len--; /* since loop does len-- */
string += unichar_len; len -= unichar_len;
}
return 0;
}
