Great. I suggest we actually put that in std.string such that run-time
code could use it as well.
Andrei
On 04/20/2010 10:13 AM, Don Clugston wrote:
I've found that the function below is invaluable for CTFE programming;
it gets rid of a huge fraction of the ugliness.
I think this function, or something like it, should be in std.metastrings.
==================
/** 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`);
}
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