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closed #75

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minor changes, but the core idea remains the same
This commit is contained in:
Niels
2015-07-26 18:41:58 +02:00
parent c8ced4ecbc
commit 359cf7993f
4 changed files with 287 additions and 168 deletions
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185
src/json.hpp.re2c
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@ -4535,68 +4535,31 @@ class basic_json
}
/*!
@brief escape a string
@brief calculates the extra space to escape a JSON string
Escape a string by replacing certain special characters by a sequence of an
escape character (backslash) and another character and other control
characters by a sequence of "\u" followed by a four-digit hex
representation.
@param[out] o the stream to write the escaped string to
@param[in] s the string to escape
@return the number of characters required to escape string @a s
@complexity Linear in the length of string @a s.
*/
static void escape_string(std::ostream& o, const string_t& s)
static std::size_t extra_space(const string_t& s) noexcept
{
for (const auto c : s)
std::size_t result = 0;
for (const auto& c : s)
{
switch (c)
{
// quotation mark (0x22)
case '"':
{
o << "\\\"";
break;
}
// reverse solidus (0x5c)
case '\\':
{
o << "\\\\";
break;
}
// backspace (0x08)
case '\b':
{
o << "\\b";
break;
}
// formfeed (0x0c)
case '\f':
{
o << "\\f";
break;
}
// newline (0x0a)
case '\n':
{
o << "\\n";
break;
}
// carriage return (0x0d)
case '\r':
{
o << "\\r";
break;
}
// horizontal tab (0x09)
case '\t':
{
o << "\\t";
// from c (1 byte) to \x (2 bytes)
result += 1;
break;
}
@ -4604,19 +4567,121 @@ class basic_json
{
if (c >= 0x00 and c <= 0x1f)
{
// control characters (everything between 0x00 and 0x1f)
// -> create four-digit hex representation
o << "\\u" << std::hex << std::setw(4) << std::setfill('0') << int(c) << std::dec;
}
else
{
// all other characters are added as-is
o << c;
// from c (1 byte) to \uxxxx (6 bytes)
result += 5;
}
break;
}
}
}
return result;
}
/*!
@brief escape a string
Escape a string by replacing certain special characters by a sequence of an
escape character (backslash) and another character and other control
characters by a sequence of "\u" followed by a four-digit hex
representation.
@param[in] s the string to escape
@return the escaped string
@complexity Linear in the length of string @a s.
*/
static string_t escape_string(const string_t& s) noexcept
{
const auto space = extra_space(s);
if (space == 0)
{
return s;
}
// create a result string of necessary size
string_t result(s.size() + space, '\\');
std::size_t pos = 0;
for (const auto& c : s)
{
switch (c)
{
// quotation mark (0x22)
case '"':
{
result[pos + 1] = '"';
pos += 2;
break;
}
// reverse solidus (0x5c)
case '\\':
{
// nothing to change
pos += 2;
break;
}
// backspace (0x08)
case '\b':
{
result[pos + 1] = 'b';
pos += 2;
break;
}
// formfeed (0x0c)
case '\f':
{
result[pos + 1] = 'f';
pos += 2;
break;
}
// newline (0x0a)
case '\n':
{
result[pos + 1] = 'n';
pos += 2;
break;
}
// carriage return (0x0d)
case '\r':
{
result[pos + 1] = 'r';
pos += 2;
break;
}
// horizontal tab (0x09)
case '\t':
{
result[pos + 1] = 't';
pos += 2;
break;
}
default:
{
if (c >= 0x00 and c <= 0x1f)
{
// print character c as \uxxxx
sprintf(&result[pos + 1], "u%04x", int(c));
pos += 6;
}
else
{
// all other characters are added as-is
result[pos++] = c;
}
break;
}
}
}
return result;
}
/*!
@ -4667,9 +4732,9 @@ class basic_json
{
o << (pretty_print ? ",\n" : ",");
}
o << string_t(new_indent, ' ') << "\"";
escape_string(o, i->first);
o << "\":" << (pretty_print ? " " : "");
o << string_t(new_indent, ' ') << "\""
<< escape_string(i->first) << "\":"
<< (pretty_print ? " " : "");
i->second.dump(o, pretty_print, indent_step, new_indent);
}
@ -4724,9 +4789,7 @@ class basic_json
case (value_t::string):
{
o << string_t("\"");
escape_string(o, *m_value.string);
o << "\"";
o << string_t("\"") << escape_string(*m_value.string) << "\"";
return;
}