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parseShebangs: Make strings with backtick sequences representable

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This commit is contained in:
Robert Hensing 2023-11-06 18:19:14 +01:00 • committed by tomberek
parent ffd414eb75
commit 589d338776
4 changed files with 129 additions and 3 deletions
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32
src/libutil/args.cc
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@ -189,12 +189,40 @@ void ParseQuoted::operator()(std::shared_ptr<Parser> &state, Strings & r) {
throw Error("unterminated quoted string in nix shebang");
}
switch (remaining[0]) {
case ' ':
if ((remaining.size() == 3 && remaining[1] == '`' && remaining[2] == '`')
|| (remaining.size() > 3 && remaining[1] == '`' && remaining[2] == '`' && remaining[3] != '`')) {
// exactly two backticks mark the end of a quoted string, but a preceding space is ignored if present.
state = std::make_shared<ParseUnquoted>(ParseUnquoted(remaining.substr(3)));
r.push_back(acc);
return;
}
else {
// just a normal space
acc += remaining[0];
remaining = remaining.substr(1);
return;
}
case '`':
if (remaining.size() > 1 && remaining[1] == '`') {
// exactly two backticks mark the end of a quoted string
if ((remaining.size() == 2 && remaining[1] == '`')
|| (remaining.size() > 2 && remaining[1] == '`' && remaining[2] != '`')) {
state = std::make_shared<ParseUnquoted>(ParseUnquoted(remaining.substr(2)));
r.push_back(acc);
return;
}
// a sequence of at least 3 backticks is one escape-backtick which is ignored, followed by any number of backticks, which are verbatim
else if (remaining.size() >= 3 && remaining[1] == '`' && remaining[2] == '`') {
// ignore "escape" backtick
remaining = remaining.substr(1);
// add the rest
while (remaining.size() > 0 && remaining[0] == '`') {
acc += '`';
remaining = remaining.substr(1);
}
return;
}
else {
acc += remaining[0];
remaining = remaining.substr(1);
@ -208,7 +236,7 @@ void ParseQuoted::operator()(std::shared_ptr<Parser> &state, Strings & r) {
assert(false);
}
static Strings parseShebangContent(std::string_view s) {
Strings parseShebangContent(std::string_view s) {
Strings result;
std::shared_ptr<Parser> parserState(std::make_shared<ParseUnquoted>(ParseUnquoted(s)));