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Add support for alias parameter substitution in quoted strings

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- For backward compatibility, you need to indicate that substitution is
  allowed in the string by prepending it with a % character:

    alias asay "say %\"%1\""

  The above will substitute the alias parameter.

    alias asay "say \"%1\""

  The above will not substitute the alias parameter but use the string
  literal "%1" directly.
This commit is contained in:
Randy Heit 2015-06-30 13:01:48 -05:00
parent f0b73b30c0
commit 0fa0dc5f9e
1 changed files with 45 additions and 15 deletions
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60
src/c_dispatch.cpp
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@ -1076,7 +1076,8 @@ FString BuildString (int argc, FString *argv)
// %x or %{x} in the command line with argument x. If argument x does not
// exist, then the empty string is substituted in its place.
//
// Substitution is not done inside of quoted strings.
// Substitution is not done inside of quoted strings, unless that string is
// prepended with a % character.
//
// To avoid a substitution, use %%. The %% will be replaced by a single %.
//
@ -1091,19 +1092,12 @@ FString SubstituteAliasParams (FString &command, FCommandLine &args)
char *p = command.LockBuffer(), *start = p;
unsigned long argnum;
FString buf;
bool inquote = false;
while (*p != '\0')
{
if (*p == '%' && ((p[1] >= '0' && p[1] <= '9') || p[1] == '{' || p[1] == '%'))
if (p[0] == '%' && ((p[1] >= '0' && p[1] <= '9') || p[1] == '{'))
{
if (p[1] == '%')
{
// Do not substitute. Just collapse to a single %.
buf.AppendCStrPart (start, p - start + 1);
start = p = p + 2;
continue;
}
// Do a substitution. Output what came before this.
buf.AppendCStrPart (start, p - start);
@ -1115,14 +1109,50 @@ FString SubstituteAliasParams (FString &command, FCommandLine &args)
}
p = (start += (p[1] == '{' && *start == '}'));
}
else if (*p == '"')
else if (p[0] == '%' && p[1] == '%')
{
// Don't substitute inside quoted strings.
p++;
while (*p != '\0' && (*p != '"' || *(p-1) == '\\'))
// Do not substitute. Just collapse to a single %.
buf.AppendCStrPart (start, p - start + 1);
start = p = p + 2;
continue;
}
else if (p[0] == '%' && p[1] == '"')
{
// Collapse %" to " and remember that we're in a quote so when we
// see a " character again, we don't start skipping below.
if (!inquote)
{
inquote = true;
buf.AppendCStrPart(start, p - start);
start = p + 1;
}
else
{
inquote = false;
}
p += 2;
}
else if (p[0] == '\\' && p[1] == '"')
{
p += 2;
}
else if (p[0] == '"')
{
// Don't substitute inside quoted strings if it didn't start
// with a %"
if (!inquote)
{
p++;
if (*p != '\0')
while (*p != '\0' && (*p != '"' || *(p-1) == '\\'))
p++;
if (*p != '\0')
p++;
}
else
{
inquote = false;
p++;
}
}
else
{