Failed compilation with '"'

[philippesigaud]

Failed compilation with '"'

[PhilippeSigaud]

Yes, quote and double quote escapes is a difficult subject: the double quote is passed as input and transformed into D code, which is itself assembled as a string. So quotes create problems.

It's easier to use predefined parsers to deal with them (you get them when you import pegged.grammar):

• Quote, that recognizes '
• DoubleQuote, that recognizes "
• BackQuote, that recognizes `

See https://github.com/PhilippeSigaud/Pegged/wiki/Predefined-Parsers

There are also predefined parsers for end of lines, slashes, and so on.

Do you have an example of a failed compilation?

[meh]

import pegged.grammar;

mixin(grammar(`A < '"'`));

void main ()
{

}

lol.d(90): Error: unterminated string constant starting at lol.d(49)
lol.d(90): Error: found 'EOF' when expecting ')' following template argument list
lol.d(90): Error: members expected
lol.d(90): Error: { } expected following aggregate declaration
lol.d(90): Error: } expected following member declarations in aggregate

[PhilippeSigaud]

Yeah, that's because it's difficult to propagate a double quote as a string argument to a template, when this template is itself being assembled as a string.

Use DoubleQuote:

import pegged.grammar;

mixin(grammar(`A < DoubleQuote`));

void main ()
{
}

[meh]

Will do, just checking it wasn't an unknown bug, thanks :)

[PhilippeSigaud]

It's a known bug :) I should write a wiki page specifically on string escaping.

IIRC I tried to automatically escape quotes with " and ', but it didn't work at the time.

[meh]

I should write a wiki page specifically on string escaping.

That would be really useful.