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Implemented static methods in String struct. Implemented String.Format and String.AppendFormat. Implemented native vararg methods for the future.

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ZZYZX 2017-01-21 02:07:44 +02:00 • committed by Christoph Oelckers
commit 6f5fff00a0
14 changed files with 213 additions and 312 deletions
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173
src/scripting/thingdef_data.cpp
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@ -945,3 +945,176 @@ DEFINE_ACTION_FUNCTION(FString, Replace)
return 0;
}
static FString FStringFormat(VM_ARGS)
{
assert(param[0].Type == REGT_STRING);
FString fmtstring = param[0].s().GetChars();
// note: we don't need a real printf format parser.
// enough to simply find the subtitution tokens and feed them to the real printf after checking types.
// https://en.wikipedia.org/wiki/Printf_format_string#Format_placeholder_specification
FString output;
bool in_fmt = false;
FString fmt_current;
int argnum = 1;
int argauto = 1;
// % = starts
// [0-9], -, +, \s, 0, #, . continue
// %, s, d, i, u, fF, eE, gG, xX, o, c, p, aA terminate
// various type flags are not supported. not like stuff like 'hh' modifier is to be used in the VM.
// the only combination that is parsed locally is %n$...
bool haveargnums = false;
for (size_t i = 0; i < fmtstring.Len(); i++)
{
char c = fmtstring[i];
if (in_fmt)
{
if ((c >= '0' && c <= '9') ||
c == '-' || c == '+' || (c == ' ' && fmt_current[fmt_current.Len() - 1] != ' ') || c == '#' || c == '.')
{
fmt_current += c;
}
else if (c == '$') // %number$format
{
if (!haveargnums && argauto > 1)
ThrowAbortException(X_FORMAT_ERROR, "Cannot mix explicit and implicit arguments.");
FString argnumstr = fmt_current.Mid(1);
if (!argnumstr.IsInt()) ThrowAbortException(X_FORMAT_ERROR, "Expected a numeric value for argument number, got '%s'.", argnumstr.GetChars());
argnum = argnumstr.ToLong();
if (argnum < 1 || argnum >= numparam) ThrowAbortException(X_FORMAT_ERROR, "Not enough arguments for format (tried to access argument %d, %d total).", argnum, numparam);
fmt_current = "%";
haveargnums = true;
}
else
{
fmt_current += c;
switch (c)
{
// string
case 's':
{
if (argnum < 0 && haveargnums)
ThrowAbortException(X_FORMAT_ERROR, "Cannot mix explicit and implicit arguments.");
in_fmt = false;
// fail if something was found, but it's not a string
if (argnum >= numparam) ThrowAbortException(X_FORMAT_ERROR, "Not enough arguments for format.");
if (param[argnum].Type != REGT_STRING) ThrowAbortException(X_FORMAT_ERROR, "Expected a string for format %s.", fmt_current.GetChars());
// append
output.AppendFormat(fmt_current.GetChars(), param[argnum].s().GetChars());
if (!haveargnums) argnum = ++argauto;
else argnum = -1;
break;
}
// pointer
case 'p':
{
if (argnum < 0 && haveargnums)
ThrowAbortException(X_FORMAT_ERROR, "Cannot mix explicit and implicit arguments.");
in_fmt = false;
// fail if something was found, but it's not a string
if (argnum >= numparam) ThrowAbortException(X_FORMAT_ERROR, "Not enough arguments for format.");
if (param[argnum].Type != REGT_POINTER) ThrowAbortException(X_FORMAT_ERROR, "Expected a pointer for format %s.", fmt_current.GetChars());
// append
output.AppendFormat(fmt_current.GetChars(), param[argnum].a);
if (!haveargnums) argnum = ++argauto;
else argnum = -1;
break;
}
// int formats (including char)
case 'd':
case 'i':
case 'u':
case 'x':
case 'X':
case 'o':
case 'c':
{
if (argnum < 0 && haveargnums)
ThrowAbortException(X_FORMAT_ERROR, "Cannot mix explicit and implicit arguments.");
in_fmt = false;
// fail if something was found, but it's not an int
if (argnum >= numparam) ThrowAbortException(X_FORMAT_ERROR, "Not enough arguments for format.");
if (param[argnum].Type != REGT_INT &&
param[argnum].Type != REGT_FLOAT) ThrowAbortException(X_FORMAT_ERROR, "Expected a numeric value for format %s.", fmt_current.GetChars());
// append
output.AppendFormat(fmt_current.GetChars(), param[argnum].ToInt());
if (!haveargnums) argnum = ++argauto;
else argnum = -1;
break;
}
// double formats
case 'f':
case 'F':
case 'e':
case 'E':
case 'g':
case 'G':
case 'a':
case 'A':
{
if (argnum < 0 && haveargnums)
ThrowAbortException(X_FORMAT_ERROR, "Cannot mix explicit and implicit arguments.");
in_fmt = false;
// fail if something was found, but it's not a float
if (argnum >= numparam) ThrowAbortException(X_FORMAT_ERROR, "Not enough arguments for format.");
if (param[argnum].Type != REGT_INT &&
param[argnum].Type != REGT_FLOAT) ThrowAbortException(X_FORMAT_ERROR, "Expected a numeric value for format %s.", fmt_current.GetChars());
// append
output.AppendFormat(fmt_current.GetChars(), param[argnum].ToDouble());
if (!haveargnums) argnum = ++argauto;
else argnum = -1;
break;
}
default:
// invalid character
output += fmt_current;
in_fmt = false;
break;
}
}
}
else
{
if (c == '%')
{
if (i + 1 < fmtstring.Len() && fmtstring[i + 1] == '%')
{
output += '%';
i++;
}
else
{
in_fmt = true;
fmt_current = "%";
}
}
else
{
output += c;
}
}
}
return output;
}
DEFINE_ACTION_FUNCTION(FString, Format)
{
PARAM_PROLOGUE;
FString s = FStringFormat(param, defaultparam, numparam, ret, numret);
ACTION_RETURN_STRING(s);
}
DEFINE_ACTION_FUNCTION(FString, AppendFormat)
{
PARAM_SELF_STRUCT_PROLOGUE(FString);
// first parameter is the self pointer
FString s = FStringFormat(param+1, defaultparam, numparam-1, ret, numret);
(*self) += s;
return 0;
}