Ellery Newcomer wrote:
Are there any good libraries for ctfe/code generation?
I don't know, things like parsing support for compile time strings,
string formatting, type <-> string
My project seems to be growing ctfe, and it's all horribly hacky and
ugly code.
I've found that the function below improves things immensely. I might
propose it for std.metastrings in the next Phobos release.
===============
/** Escape any quotes and backslashes inside the given string,
* prefixing them with the given escape sequence. Use `\` to escape
* once, `\\\` to escape twice.
*/
string enquote(string instr, string escape = `\`)
{
// This function is critical for compilation speed.
// Need to minimise the number of allocations.
// It's worth using copy-on-write even for CTFE.
for(int i = 0; i < instr.length; ++i)
{
if (instr[i] == '"' || instr[i] == '\\')
{
string str = instr[0..i] ~ escape;
int m = i;
foreach(int k, char c; instr[i+1..$])
{
if (c=='"' || c=='\\')
{
str ~= instr[m..i+1+k] ~ escape;
m = i+k+1;
}
}
return str ~ instr[m..$];
}
}
return instr;
}
unittest {
assert(enquote(`"a\"`)==`\"a\\\"`);
assert(enquote(`abc`)==`abc`);
}
