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macros.d
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macros.d
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/**
* C preprocessor
* Copyright: 2013 by Digital Mars
* License: $(LINK2 http://boost.org/LICENSE_1_0.txt, Boost License 1.0).
* Authors: Walter Bright
*/
module macros;
import core.stdc.stdlib;
import core.stdc.string;
import std.algorithm;
import std.array;
import std.ascii;
import std.range;
import std.stdio;
import std.traits;
import context;
import id;
import util;
import number;
import ranges;
import skip;
import textbuf;
import charclass;
bool logging;
// Embedded escape sequence commands
enum ESC : ubyte
{
start = '\x00', // 0 can never appear in legit input, so this is the start
arg1 = '\x01',
concat = '\xFF',
stringize = '\xFE',
space = '\xFD',
brk = '\xFC', // separate adjacent tokens
expand = '\xFB',
}
/************************************
* Transform the macro definition 'text' into a replacement list.
* Embed escape sequence commands for argument substitution, argument stringizing,
* and token concatenation.
* Input:
* objectLike true if object-like macro, false if function-like
* parameters macro parameters
* text Original text; must end with \n
* Returns:
* replacement list with embedded commands for inserting arguments and stringizing
*/
ustring macroReplacementList(R)(ref R text, bool objectLike, ustring[] parameters)
{
alias Unqual!(ElementEncodingType!R) E;
if (text.empty)
return cast(ustring)"";
E[1000] tmpbuf = void;
auto outbuf = Textbuf!(uchar, "mrl")(tmpbuf);
outbuf.put(0);
while (1)
{ E c = cast(E)text.front;
text.popFront();
switch (c)
{
case '\t':
c = ' ';
goto case;
case ' ':
if (outbuf.length == 1 || // no leading whitespace
outbuf.last() == ' ') // collapse adjacent whitespace into one ' '
continue;
break;
case '\n': // reached the end of the input
if (outbuf.last() == ' ')
outbuf.pop(); // no trailing whitespace
if (outbuf.last() == ESC.concat && outbuf[outbuf.length - 2] == ESC.start)
err_fatal("## cannot appear at end of macro text");
//textPrint(outbuf[1 .. outbuf.length]);
return outbuf[1 .. outbuf.length].idup;
case '\r':
continue;
case '"':
/* Skip over character literals and string literals without
* examining their insides
*/
outbuf.put(c);
text = text.skipStringLiteral(outbuf);
continue;
case 'R':
if (cast(E)text.front == '"')
{
text.popFront();
outbuf.put('R');
outbuf.put('"');
text = text.skipRawStringLiteral(outbuf);
continue;
}
goto default;
case '\'':
outbuf.put(c);
text = text.skipCharacterLiteral(outbuf);
continue;
case '/':
if (outbuf.last() == '/')
{ // C++ style comments end the input
text = text.skipCppComment();
outbuf.pop();
goto case '\n';
}
break;
case '*':
if (outbuf.last() == '/')
{ // C style comments are treated as a single ' '
text = text.skipCComment();
outbuf.pop();
goto case '\t';
}
break;
case '#':
if (text.front == '#')
{
text.popFront();
/* The ## token concatenation operator.
* Remove leading and trailing spaces, replace with ESC.start ESC.concat
*/
if (outbuf.last() == ' ')
outbuf.pop();
if (outbuf.length == 1)
err_fatal("## cannot appear at beginning of macro text");
outbuf.put(ESC.start);
outbuf.put(ESC.concat);
text = text.skipWhitespace();
continue;
}
else if (!objectLike)
{
/* The # stringize operator, parameter must immediately follow
*/
text = text.skipWhitespace();
StaticArrayBuffer!(uchar, 1024) id = void;
id.initialize();
text = text.inIdentifier(id);
auto argi = countUntil(parameters, id[]);
if (argi == -1)
err_fatal("# must be followed by parameter");
else
{
outbuf.put(ESC.start);
outbuf.put(ESC.stringize);
outbuf.put(cast(uchar)(argi + 1));
}
continue;
}
break;
default:
if (isIdentifierStart(c))
{
if (parameters.length)
{
StaticArrayBuffer!(uchar, 1024) id = void;
id.initialize();
id.put(c);
text = text.inIdentifier(id);
auto argi = countUntil(parameters, id[]);
if (argi == -1)
{
outbuf.put(id[]);
}
else
{
outbuf.put(ESC.start);
outbuf.put(cast(uchar)(argi + 1));
}
}
else
{
outbuf.put(c);
while (1)
{
E c2 = cast(E)text.front;
if (isAlphaNum(c2) || c2 == '_' || c2 == '$')
{
text.popFront();
outbuf.put(c2);
}
else
break;
}
}
continue;
}
break;
}
outbuf.put(c);
}
assert(0);
}
unittest
{
ustring s;
auto r = cast(ustring)"\n";
s = r.macroReplacementList(true, null);
assert(s == "");
r = cast(ustring)" \t/*hello*/ //\n";
s = r.macroReplacementList(true, null);
assert(s == "");
r = cast(ustring)"# \n";
s = r.macroReplacementList(true, null);
assert(s == "#");
r = cast(ustring)"a ## /**/z\n";
s = r.macroReplacementList(true, null);
assert(s == "a" ~ ESC.start ~ ESC.concat ~ "z");
r = cast(ustring)"x#/**/abc y\n";
s = r.macroReplacementList(false, cast(ustring[])(["abc"]));
//writefln("'%s', %s", s, s.length);
assert(s == "x" ~ ESC.start ~ ESC.stringize ~ ESC.arg1 ~ " y");
r = cast(ustring)"x abc/**/y\n";
s = r.macroReplacementList(false, cast(ustring[])(["abc"]));
assert(s == "x " ~ ESC.start ~ ESC.arg1 ~ " y");
r = cast(ustring)"x \"abc\" R\"a(abc)a\" 'a' \ry\n";
s = r.macroReplacementList(false, cast(ustring[])(["abc","a"]));
assert(s == "x \"abc\" R\"a(abc)a\" 'a' y");
}
/***********************************************
* Remove leading and trailing whitespace (' ' and ESC.brk).
* Leave ESC.space intact.
* Returns:
* modified input
*/
uchar[] trimWhiteSpace(uchar[] text)
{
// Remove leading
size_t fronti;
size_t frontn;
while (fronti < text.length)
{
switch (text[fronti])
{
case ' ':
case ESC.brk:
++fronti;
continue;
case ESC.space:
++frontn;
++fronti;
continue;
default:
break;
}
break;
}
// Remove trailing
size_t backi = text.length;
size_t backn;
while (backi > fronti + 1)
{
switch (text[backi - 1])
{
case ' ':
case ESC.brk:
--backi;
continue;
case ESC.space:
++backn;
--backi;
continue;
default:
break;
}
break;
}
if (frontn)
text[fronti - frontn .. fronti] = ESC.space;
if (backn)
text[backi .. backi + backn] = ESC.space;
//writefln("frontn %d fronti %d backi %d backn %d", frontn, fronti, backn, backi);
return text[fronti - frontn .. backi + backn];
}
unittest
{
uchar[0] a;
auto s = trimWhiteSpace(a);
assert(s == "");
char[1] b = " ";
s = trimWhiteSpace(cast(ubyte[])b);
assert(s == "");
ubyte[6] c = cast(ubyte[])("" ~ ESC.brk ~ " a " ~ ESC.brk ~ " ");
s = trimWhiteSpace(cast(uchar[])c);
assert(s == "a");
ubyte[6] d = cast(ubyte[])("" ~ ESC.space ~ " a " ~ ESC.space ~ " ");
s = trimWhiteSpace(cast(uchar[])d);
assert(s == x"FD 61 FD");
ubyte[1] e = cast(ubyte[])("" ~ ESC.space ~ "");
s = trimWhiteSpace(cast(uchar[])e);
assert(s == x"FD");
ubyte[8] f = cast(ubyte[])("" ~ ESC.space ~ " ab " ~ ESC.space ~ "" ~ ESC.space ~ " ");
s = trimWhiteSpace(cast(uchar[])f);
//writefln("'%s', %s", s, s.length);
assert(s == x"FD 61 62 FD FD");
}
/******************************************
* Remove all ESC.space and ESC.brk markers.
* Remove all leading and trailing spaces.
* All done in-place.
*/
private uchar[] trimEscWhiteSpace(uchar[] text)
{
auto p = text.ptr;
bool leading = true;
foreach (uchar c; text)
{
switch (c)
{
case ESC.space:
case ESC.brk:
continue;
case ' ':
if (leading)
continue;
break;
default:
leading = false;
break;
}
*p++ = c;
}
while (p > text.ptr && p[-1] == ' ')
{
--p;
}
return text[0 .. p - text.ptr];
}
unittest
{
ubyte[11] a = cast(ubyte[])("" ~ ESC.space ~ " a" ~ ESC.brk ~ " " ~ ESC.space ~ "b " ~ ESC.space ~ "" ~ ESC.space ~ " ");
auto s = trimEscWhiteSpace(cast(uchar[])a);
//writefln("'%s', %s", s, s.length);
assert(s == "a b");
}
/*************************************
* Stringize the argument of the # operator per C99 6.10.3.2.2
* Output:
* writes to OutputRange r
*/
private void stringize(R)(ref R outbuf, const(uchar)[] text)
{
// Remove leading spaces
size_t i;
for (; i < text.length; ++i)
{
auto c = text[i];
if (!(c == ' ' || c == ESC.space || c == ESC.brk))
break;
}
text = text[i .. $];
// Remove trailing spaces
for (i = text.length; i; --i)
{
auto c = text[i - 1];
if (!(c == ' ' || c == ESC.space || c == ESC.brk))
break;
}
text = text[0 .. i];
outbuf.put('"');
// Adapter OutputRange to escape certain characters
struct EscString
{
void put(uchar c)
{
switch (c)
{
case '"':
case '?':
case '\\':
outbuf.put('\\');
goto default;
default:
outbuf.put(c);
break;
case ESC.expand:
case ESC.brk:
break; // ignore
}
}
}
EscString es;
while (!text.empty)
{
auto c = cast(uchar)text.front;
text.popFront();
switch (c)
{
case 'R':
if (!text.empty && text.front == '"')
{
outbuf.put('R');
es.put('"');
text.popFront();
text = text.skipRawStringLiteral(es);
}
else
goto default;
break;
case '"':
es.put(c);
text = text.skipStringLiteral(es);
break;
case '\'':
outbuf.put(c);
text = text.skipCharacterLiteral(es);
break;
case '?':
outbuf.put('\\');
goto default;
default:
outbuf.put(c);
break;
case ESC.expand:
case ESC.brk:
break; // ignore
}
}
outbuf.put('"');
}
unittest
{
uchar[10] tmpbuf = void;
auto outbuf = Textbuf!uchar(tmpbuf);
outbuf.initialize();
stringize(outbuf, cast(ustring)" ");
assert(outbuf[] == `""`);
outbuf.initialize();
stringize(outbuf, cast(ustring)(" " ~ ESC.space ~ "" ~ ESC.brk ~ "a" ~ ESC.expand ~ "" ~ ESC.brk ~ "bc" ~ ESC.space ~ "" ~ ESC.brk ~ " "));
assert(outbuf[] == `"abc"`);
outbuf.initialize();
stringize(outbuf, cast(ustring)(`ab?\\x'y'"z"`));
assert(outbuf[] == `"ab\?\\x'y'\"z\""`);
outbuf.initialize();
stringize(outbuf, cast(ustring)(`'\'a\\'b\`));//`
assert(outbuf[] == `"'\\'a\\\\'b\"`);
outbuf.initialize();
stringize(outbuf, cast(ustring)(`"R"x(aa)x""`));
assert(outbuf[] == `"\"R\"x(aa)x\"\""`);
outbuf.initialize();
ubyte[] u = cast(ubyte[])"R\"x(a?\\a)x\"";
stringize(outbuf, cast(ustring)u);
//writefln("'%s', %s", s, s.length);
assert(outbuf[] == `"R\"x(a\?\\a)x\""`);
outbuf.free();
}
/********************************************
* Fix _Pragma arg by destringizing per C99 6.10.9:
* "The string literal is destringized by deleting the L prefix, if
* present, deleting the leading and trailing double-quotes, replacing each
* escape sequence \" by a double-quote, and replacing each escape sequence \\ by
* a single backslash."
*/
void destringizePragmaArg(S, T)(S args, ref T argbuffer)
{
bool slash;
assert(args.length == 1);
auto arg = args[0];
//writefln("destringizePragmaArg('%s')", cast(string)arg);
size_t len = argbuffer.length;
if (arg.length < 2)
goto Lerror;
if (arg[0] == ' ')
arg = arg[1 .. $];
if (arg[0] == 'L')
arg = arg[1 .. $];
if (arg.length < 2)
goto Lerror;
if (arg[0] != '"')
goto Lerror;
arg = arg[1 .. $];
argbuffer.initialize(); // recycle argbuffer, overwriting arg
foreach (i, c; arg)
{
switch (c)
{
case '\\':
slash = !slash;
if (slash)
continue;
break;
case '"':
if (!slash)
{
if (i + 1 == arg.length)
{ }
else if (i + 2 == arg.length && arg[i + 1] == ' ')
{ } // allow trailing space
else
goto Lerror;
args.pop();
args.put(cast(ustring)(argbuffer[]));
return;
}
slash = false;
break;
default:
slash = false;
break;
}
argbuffer.put(c);
}
Lerror:
err_fatal("argument to _Pragma must be a string literal");
}
/********************************************
* Get Ith arg from args.
*/
private ustring null_arg = cast(ustring)"";
ustring getIthArg(ustring[] args, size_t argi)
{
if (args.length < argi)
return null;
ustring a = args[argi - 1];
if (a is null)
a = null_arg; // so we can distinguish a missing arg (null_arg) from an empty arg ("")
return a;
}
/*******************************************
* Build macro expanded text, writing it to buffer.
*/
//debug=macroExpandedText;
void macroExpandedText(Context, R)(Id* m, ustring[] args, ref R buffer)
{
debug (macroExpandedText)
{
writefln("macroExpandedText(m = '%s')", cast(string)m.name);
//write("\ttext = "); textPrint(m.text);
writefln("\ttext = '%s'", cast(string)m.text);
for (size_t i = 1; i <= args.length; ++i)
{
auto a = getIthArg(args, i);
writefln("\t[%d] = '%s'", i, cast(string)a);
}
auto bufferlen = buffer.length;
}
/* Determine if we should elide commas ( ,##__VA_ARGS__ extension)
*/
size_t va_args = 0;
if (m.flags & Id.IDdotdotdot)
{ const margs = m.parameters.length;
/* Only elide commas if there are more arguments than ...
* This is unlike GCC, which also elides comments if there is only a ...
* parameter, unless Standard compliant switches are thrown.
*/
if (margs >= 2)
{
// Only elide commas if __VA_ARGS__ was missing (not blank)
if (getIthArg(args, margs) is null_arg)
va_args = margs;
}
}
/* The expanded version of each element in args[] is stored in expbuf[],
* one after the other.
* This is so that args[] are never expanded more than once, subsequent
* references will use the previously expanded version.
* Slices of previously expanded versions are kept in cache[].
*/
uchar[512] tmpbuf = void;
auto expbuf = Textbuf!(uchar,"met")(tmpbuf);
assert(expbuf.length == 0);
// cache[arg-index] contains the offsets in expbuf where the macro
// argument at the given index was previously expanded.
size_t[2][20] cachetmp = void;
size_t[2][] cache = cachetmp;
if (args.length + 1 > cachetmp.length)
{
auto p = malloc(size_t[2].sizeof * (args.length + 1));
assert(p);
cache = (cast(size_t[2]*)p)[0 .. args.length + 1];
}
for (size_t i = 0; i < args.length + 1; ++i)
{
cache[i][1] = 0; // the check for initialization is only done on the [1] element
}
scope (exit)
{
if (args.length + 1 > cachetmp.length)
{
free(cache.ptr);
}
expbuf.free();
//foreach (arg; args)
//if (arg.ptr) free(cast(void*)arg.ptr);
debug (macroExpandedText)
{
writefln("-macroExpandedText(m = '%s')", cast(string)m.name);
writefln("\t'%s'", cast(string)buffer[bufferlen .. buffer.length]);
}
}
/* ESC.start, ESC.stringize and ESC.concat only appear in text[]
*/
for (size_t q = 0; q < m.text.length; ++q)
{
if (m.text[q] == ESC.start)
{
bool expand = true;
bool trimleft = false;
bool trimright = false;
Lagain2:
auto argi = m.text[++q];
switch (argi)
{
case ESC.start: // ESC.start was 'quoted'
buffer.put(ESC.start);
continue;
case ESC.stringize: // stringize argument
{
const argi2 = m.text[++q];
const arg = getIthArg(args, argi2);
stringize(buffer, arg);
continue;
}
case ESC.concat:
if (q + 1 < m.text.length && m.text[q + 1] == ESC.start)
{
/* Look for special case of:
* ',' ESC.start ESC.concat ESC.start __VA_ARGS__
*/
if (q >= 2 && q + 2 < m.text.length &&
m.text[q + 2] == va_args && m.text[q - 2] == ',')
{
/* Elide the comma that was already in buffer,
* replace it with ESC.brk
*/
buffer.pop();
buffer.put(ESC.brk);
}
expand = false;
trimleft = true;
++q;
goto Lagain2;
}
continue; // ignore
default:
// If followed by ESC.concat, don't expand
if (q + 2 < m.text.length &&
m.text[q + 1] == ESC.start && m.text[q + 2] == ESC.concat)
{ expand = false;
trimright = true;
/* Special case of ESC.start i ESC.start ESC.concat ESC.start j
* Paul Mensonides writes:
* In summary, blue paint (ESC.expand) on either operand of
* ## should be discarded unless the concatenation doesn't
* produce a new identifier--which can only happen (in
* well-defined code) via the concatenation of a
* placemarker. (Concatenation that doesn't produce a
* single preprocessing token produces undefined
* behavior.)
*/
size_t argj;
if (q + 4 < m.text.length &&
m.text[q + 3] == ESC.start &&
(argj = m.text[q + 4]) != ESC.start &&
argj != ESC.stringize &&
argj != ESC.concat)
{
//writeln("\tspecial CAT case");
auto a = getIthArg(args, argi);
while (a.length && (a[a.length - 1] == ' ' || a[a.length - 1] == ESC.space))
a = a[0 .. $ - 1];
auto b = getIthArg(args, argj);
auto bstart = b;
while (b.length && (b[0] == ' ' || b[0] == ESC.space || b[0] == ESC.expand))
b = b[1 .. $];
if (!(b.length && isIdentifierChar(b[0])))
break;
if (!a.length && b.length < bstart.length && b.ptr[-1] == ESC.expand)
{ // Keep the ESC.expand
buffer.put(ESC.expand);
buffer.put(b);
q += 4;
continue;
}
size_t pe = a.length;
while (1)
{
if (!pe)
goto L1;
--pe;
if (a[pe] == ESC.expand)
break;
}
if (!isIdentifierStart(a[pe + 1]))
break;
for (size_t k = pe + 1; k < a.length; ++k)
{
if (!isIdentifierChar(a[k]))
goto L1;
}
//writefln("CAT pe = %s, a.length = %s, b.length = %s", pe, a.length, b.length);
buffer.put(a[0 .. pe]);
buffer.put(a[pe + 1 .. a.length]);
buffer.put(b);
q += 4;
continue;
}
}
break;
}
L1:
auto a = getIthArg(args, argi);
//writefln("\t\targ[%d] = '%s'", argi, cast(string)a);
if (expand)
{
//writefln("\t\tbefore '%s'", cast(string)a);
if (cache[argi][1]) // if already expanded
{
// Reuse cached version
auto t = expbuf[cache[argi][0] .. cache[argi][1]];
if (t.length && isMultiTok(t[0]))
buffer.put(ESC.brk);
buffer.put(t);
if (t.length && isMultiTok(t[t.length - 1]))
buffer.put(ESC.brk);
}
else
{
auto start = expbuf.length;
macroExpand!Context(a, expbuf);
//writefln("\t\tafter '%s'", cast(string)expbuf[]);
auto s = expbuf[start .. expbuf.length];
auto t = trimEscWhiteSpace(s);
//writefln("\t\ttrim '%s'", cast(string)t);
if (t.length && isMultiTok(t[0]))
buffer.put(ESC.brk);
buffer.put(t);
if (t.length && isMultiTok(t[t.length - 1]))
buffer.put(ESC.brk);
auto b = expbuf[];
cache[argi][0] = t.ptr - b.ptr;
cache[argi][1] = t.ptr - b.ptr + t.length;
assert(t.length <= b.length);
}
}
else
{
if (trimleft)
{
while (a.length && (a[0] == ' ' || a[0] == ESC.space || a[0] == ESC.expand))
a = a[1 .. $];
}
if (trimright)
{
while (a.length && (a[a.length - 1] == ' ' || a[a.length - 1] == ESC.space))
a = a[0 .. $ - 1];
}
buffer.put(a);
}
}
else
buffer.put(m.text[q]);
}
}
/*****************************************
* Take string text, fully macro expand it, and write the result to outbuf.
*/
//debug=MacroExpand;
// This table is to speed the switch() lookup in macroExpand()
private enum EXPAND : ubyte { none, doublequote, singlequote, expand, zero, dot, digit, idstart }
private immutable EXPAND[256] expand;
static this()
{
// Initialize lookup table
foreach (uint u; 0 .. 256)
{
EXPAND e;
switch (u)
{
case '"': e = EXPAND.doublequote; break;
case '\'': e = EXPAND.singlequote; break;
case ESC.expand: e = EXPAND.expand; break;
case 0: e = EXPAND.zero; break;
case '.': e = EXPAND.dot; break;
case '0': .. case '9': e = EXPAND.digit; break;
default:
if (isIdentifierStart(cast(ubyte)u))
e = EXPAND.idstart;
break;
}
expand[u] = e;
}
}
void macroExpand(Context, R)(const(uchar)[] text, ref R outbuf)
{
debug (MacroExpand)
writefln("+macroExpand(text = '%s')", cast(string)text);
alias uchar E;
auto ctx = Context.getContext();
ctx.expanded.off();
auto r = ctx.pushContext();
r.push(text);
r.popFront();
Louter:
while (1) //(!r.empty) // r.front returns 0 for end of input
{
auto c = r.front;
final switch (expand[c])
{
case EXPAND.doublequote:
/* Skip over character literals and string literals without
* examining their insides
*/
r.popFront();
if (outbuf.length && outbuf.last() == 'R')
{
outbuf.put(c);
r = r.skipRawStringLiteral(outbuf);
}
else
{
outbuf.put(c);
r = r.skipStringLiteral(outbuf);
}
continue;
case EXPAND.singlequote:
r.popFront();
outbuf.put(c);
r = r.skipCharacterLiteral(outbuf);
continue;
case EXPAND.expand:
r.popFront();
outbuf.put(c);
c = r.front;
if (isIdentifierStart(c))
{
r = r.inIdentifier(outbuf);
continue;
}
r.popFront();
break;
case EXPAND.zero:
goto Ldone;
case EXPAND.dot:
r.popFront();
outbuf.put(c);
if (!r.empty)
{
c = r.front;
switch (c)
{
case '0': .. case '9':
r = r.skipFloat(outbuf, false, true, false);
break;
case '*':
r.popFront();
outbuf.put(c);
break;
case '.':
r.popFront();
outbuf.put(c);
if (!r.empty && r.front == '.')
{
outbuf.put(c);
r.popFront();
continue;
}
break;
default:
break;
}
}
continue;
case EXPAND.digit:
r = r.skipFloat(outbuf, false, false, false);
continue;
case EXPAND.idstart:
{
auto expanded = r.isExpanded();
size_t len = outbuf.length;
r = r.inIdentifier(outbuf);