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lexer.d
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lexer.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 lexer;
import std.array;
import std.ascii;
import std.range;
import std.stdio;
import std.traits;
import id;
import loc;
import macros;
import util;
import number;
import ranges;
import skip;
import stringlit;
import textbuf;
/**
* Only a relatively small number of tokens are of interest to the preprocessor.
*/
enum TOK
{
reserved,
other, // not of interest to the preprocessor
eol, // end of line
eof, // end of file
comma,
question,
colon,
oror,
andand,
or,
and,
xor,
plus,
minus,
equal,
notequal,
lt,
gt,
le,
ge,
shl,
shr,
mul,
div,
mod,
not,
tilde,
dollar,
lparen,
rparen,
defined,
dotdotdot,
assign,
hash,
integer,
identifier,
string,
sysstring,
}
alias long ppint_t;
alias ulong ppuint_t;
struct PPnumber
{
ppint_t value;
bool isunsigned; // if value is an unsigned integer
}
struct Lexer(R) if (isInputRange!R)
{
TOK front;
PPnumber number;
R src;
alias Unqual!(ElementEncodingType!R) E;
ranges.BitBucket!E bitbucket = void;
//enum bool isContext = std.traits.hasMember!(R, "expanded");
enum bool isContext = __traits(compiles, src.expanded);
StaticArrayBuffer!(E, 1024) idbuf = void;
E[40] tmpbuf;
Textbuf!(E,"str") stringbuf;
bool stringLiteral;
uchar[128] tmpbuf3 = void;
Textbuf!(uchar,"lrs") rescanbuffer;
uchar[128] tmpbuf2 = void;
Textbuf!(uchar,"lex") expbuffer;
uchar[128] tmpargbuf = void;
Textbuf!(uchar,"lar") argbuffer; // temporary buffer to contain the argument strings
ustring[16] tmpargsbuf = void;
Textbuf!(ustring,"lgs") argsbuffer; // temporary buffer to contain the args[]
bool noMacroExpand;
bool noExpand;
void needStringLiteral()
{
stringLiteral = true;
}
E[] getStringLiteral()
{
stringLiteral = false;
return stringbuf[];
}
enum empty = false; // return TOK.eof for going off the end
Loc loc()
{
static if (isContext)
{
auto csf = src.currentSourceFile();
if (csf)
return csf.loc;
}
Loc loc;
return loc;
}
/****************************
* Get a token without expanding macros.
*/
void popFrontNoExpand()
{
noMacroExpand = true;
popFront();
noMacroExpand = false;
}
void popFront()
{
//writefln("isContext %s, %s", isContext, __traits(compiles, src.expanded));
bool expanded = void;
while (1)
{
static if (!isContext)
{
if (src.empty)
{
front = TOK.eof;
return;
}
}
E c = cast(E)src.front;
switch (c)
{
case 0:
front = TOK.eof;
return;
case ' ':
case '\t':
case '\r':
case '\v':
case '\f':
case ESC.space:
case ESC.brk:
src.popFront();
continue;
case '\n':
src.popFront();
front = TOK.eol;
return;
case '0': .. case '9':
{
bool isinteger;
src = src.lexNumber(number.value, number.isunsigned, isinteger);
front = isinteger ? TOK.integer : TOK.other;
return;
}
case '.':
src.popFront();
if (!src.empty)
{
switch (src.front)
{
case '0': .. case '9':
src = src.skipFloat(bitbucket, false, true, false);
break;
case '*':
src.popFront();
break;
case '.':
src.popFront();
if (!src.empty && src.front == '.')
{
src.popFront();
front = TOK.dotdotdot;
return;
}
break;
default:
break;
}
}
goto Lother;
case '!':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
front = TOK.notequal;
return;
}
front = TOK.not;
return;
case '=':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
front = TOK.equal;
return;
}
front = TOK.assign;
return;
case '<':
src.popFront();
static if (isContext)
{
if (stringLiteral)
{
stringbuf.initialize();
src = src.lexStringLiteral(stringbuf, '>', STR.f);
front = TOK.sysstring;
return;
}
}
if (!src.empty && src.front == '=')
{
src.popFront();
front = TOK.le;
return;
}
if (!src.empty && src.front == '<')
{
src.popFront();
front = TOK.shl;
return;
}
front = TOK.lt;
return;
case '>':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
front = TOK.ge;
return;
}
if (!src.empty && src.front == '>')
{
src.popFront();
front = TOK.shr;
return;
}
front = TOK.gt;
return;
case '%':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
goto Lother;
}
front = TOK.mod;
return;
case '*':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
goto Lother;
}
front = TOK.mul;
return;
case '^':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
goto Lother;
}
front = TOK.xor;
return;
case '+':
src.popFront();
if (!src.empty && src.front == '=')
{
src.popFront();
goto Lother;
}
if (!src.empty && src.front == '+')
{
src.popFront();
goto Lother;
}
front = TOK.plus;
return;
case '-':
src.popFront();
if (!src.empty)
{
switch (src.front)
{
case '=':
case '-':
src.popFront();
goto Lother;
case '>':
src.popFront();
if (!src.empty && src.front == '*')
src.popFront();
goto Lother;
default:
break;
}
}
front = TOK.minus;
return;
case '&':
src.popFront();
if (!src.empty)
{
switch (src.front)
{
case '=':
src.popFront();
goto Lother;
case '&':
src.popFront();
front = TOK.andand;
return;
default:
break;
}
}
front = TOK.and;
return;
case '|':
src.popFront();
if (!src.empty)
{
switch (src.front)
{
case '=':
src.popFront();
goto Lother;
case '|':
src.popFront();
front = TOK.oror;
return;
default:
break;
}
}
front = TOK.or;
return;
case '$': src.popFront(); front = TOK.dollar; return;
case '(': src.popFront(); front = TOK.lparen; return;
case ')': src.popFront(); front = TOK.rparen; return;
case ',': src.popFront(); front = TOK.comma; return;
case '?': src.popFront(); front = TOK.question; return;
case ':': src.popFront(); front = TOK.colon; return;
case '~': src.popFront(); front = TOK.tilde; return;
case '#': src.popFront(); front = TOK.hash; return;
case '{':
case '}':
case '[':
case ']':
case ';':
case '@': // why does @ appear in boost/type_traits/detail/is_function_ptr_helper.hpp
src.popFront();
goto Lother;
case '/':
src.popFront();
if (!src.empty)
{
switch (src.front)
{
case '=':
src.popFront();
goto Lother;
case '/':
static if (isContext)
{
src.expanded.popBack();
src.expanded.popBack(); // remove '//'
src.expanded.off();
src.popFront();
src = src.skipCppComment();
src.expanded.on();
src.expanded.put('\n');
src.expanded.put(cast(E)src.front);
front = TOK.eol;
return;
}
else
{
src.popFront();
src = src.skipCppComment();
continue;
}
case '*':
static if (isContext)
{
src.expanded.popBack();
src.expanded.popBack(); // remove '/*'
src.expanded.off();
src.popFront();
src = src.skipCComment();
src.expanded.on();
src.expanded.put(' ');
src.expanded.put(cast(E)src.front);
}
else
{
src.popFront();
src = src.skipCComment();
}
continue;
default:
break;
}
}
front = TOK.div;
return;
case '"':
src.popFront();
static if (isContext)
{
if (stringLiteral)
{
stringbuf.initialize();
src = src.lexStringLiteral(stringbuf, '"', STR.f);
front = TOK.string;
return;
}
else
src = src.skipStringLiteral(bitbucket);
}
else
{
src = src.skipStringLiteral(bitbucket);
}
goto Lother;
case '\'':
src.popFront();
src = src.lexCharacterLiteral(number.value, STR.s);
number.isunsigned = false;
front = TOK.integer;
return;
case '_':
case 'a': .. case 't':
case 'v': .. case 'z':
case 'A': .. case 'K':
case 'M': .. case 'Q':
case 'S': .. case 'T':
case 'V': .. case 'Z':
static if (isContext)
{
if (!noMacroExpand)
{
expanded = src.isExpanded();
src.expanded.popBack();
src.expanded.off();
}
}
idbuf.initialize();
src = src.inIdentifier(idbuf);
Lident:
if (noMacroExpand)
{
front = TOK.identifier;
return;
}
static if (!isContext)
{
front = TOK.identifier;
return;
}
else
{
Id* m = void;
if (expanded && !src.empty && src.isExpanded())
goto Lisident;
m = Id.search(idbuf[]);
if (m && m.flags & Id.IDmacro && !noExpand)
{
assert(!(m.flags & Id.IDinuse));
if (m.flags & (Id.IDlinnum | Id.IDfile | Id.IDcounter))
{ // Predefined macro
src.unget();
src.pushPredefined(m);
src.expanded.on();
src.popFront();
continue;
}
argbuffer.initialize();
argsbuffer.initialize();
if (m.flags & Id.IDfunctionLike)
{
/* Scan up to opening '(' of actual argument list
*/
E space = 0;
while (1)
{
if (src.empty)
{
if (space)
{
src.expanded.on();
src.expanded.put(idbuf[]);
src.expanded.put(' ');
front = TOK.identifier;
return;
}
goto Lisident;
}
c = cast(E)src.front;
switch (c)
{
case ' ':
case '\t':
case '\r':
case '\n':
case '\v':
case '\f':
case ESC.space:
case ESC.brk:
space = c;
src.popFront();
continue;
case '/':
src.popFront();
if (src.empty)
{ c = 0;
goto default;
}
c = src.front;
if (c == '*')
{
src.popFront();
src = src.skipCComment();
space = ' ';
continue;
}
if (c == '/')
{
src.popFront();
src = src.skipCppComment();
space = ' ';
continue;
}
src.push('/');
goto default;
case '(': // found start of argument list
src.popFront();
break;
default:
src.expanded.on();
src.expanded.put(idbuf[]);
if (space)
src.expanded.put(space);
if (c)
src.expanded.put(c);
front = TOK.identifier;
return;
}
break;
}
//writefln("lexer macroScanArguments('%s')", cast(string)m.name);
src = src.macroScanArguments(cast(string)m.name,
m.parameters.length,
!!(m.flags & Id.IDdotdotdot),
argsbuffer, argbuffer);
if (m.flags & Id.IDpragma)
destringizePragmaArg(argsbuffer, argbuffer);
}
auto xcnext = src.front;
if (!src.empty)
src.unget();
expbuffer.initialize();
macroExpandedText!(typeof(*src))(m, argsbuffer[], expbuffer);
//writefln("l expanded: '%s'", cast(string)expbuffer[]);
rescanbuffer.initialize();
m.flags |= Id.IDinuse;
macroExpand!(typeof(*src))(expbuffer[], rescanbuffer);
m.flags &= ~Id.IDinuse;
auto rs = rescanbuffer[];
rs = rs.trimWhiteSpace();
//writefln("l rescanned: '%s'", cast(string)rescanbuffer[]);
/*
* Insert break if necessary to prevent
* token concatenation.
*/
if (!isWhite(xcnext))
{
src.push(ESC.brk);
}
if (rs.empty)
src.push(ESC.space);
else
src.push(rs);
//src.push(rescanbuffer[]);
src.setExpanded();
src.expanded.on();
src.expanded.put(ESC.brk);
src.popFront();
continue;
}
Lisident:
src.expanded.on();
src.expanded.put(idbuf[]);
src.expanded.put(src.front);
front = TOK.identifier;
return;
}
case 'L':
case 'u':
case 'U':
case 'R':
// string prefixes: L LR u u8 uR u8R U UR R
static if (isContext)
{
if (!noMacroExpand)
{
expanded = src.isExpanded();
src.expanded.popBack();
src.expanded.off();
}
}
idbuf.initialize();
src = src.inIdentifier(idbuf);
if (!src.empty)
{
if (src.front == '"')
{
switch (cast(string)idbuf[])
{
case "LR":
case "R":
case "u8R":
case "uR":
case "UR":
static if (isContext)
{
if (!noMacroExpand)
{
src.expanded.on();
src.expanded.put(idbuf[]);
src.expanded.put(src.front);
}
}
src.popFront();
src = src.skipRawStringLiteral(bitbucket);
goto Lother;
case "L":
case "u":
case "u8":
case "U":
static if (isContext)
{
if (!noMacroExpand)
{
src.expanded.on();
src.expanded.put(idbuf[]);
src.expanded.put(src.front);
}
src.popFront();
if (stringLiteral)
{
stringbuf.initialize();
src = src.lexStringLiteral(stringbuf, '"', STR.f);
front = TOK.string;
return;
}
else
src = src.skipStringLiteral(bitbucket);
}
else
{
src.popFront();
src = src.skipStringLiteral(bitbucket);
}
goto Lother;
default:
break;
}
}
else if (src.front == '\'')
{
auto s = STR.s;
switch (cast(string)idbuf[])
{
case "L": s = STR.L; goto Lchar;
case "u": s = STR.u; goto Lchar;
case "u8": s = STR.u8; goto Lchar;
case "U": s = STR.U; goto Lchar;
Lchar:
static if (isContext)
{
if (!noMacroExpand)
{
src.expanded.on();
src.expanded.put(idbuf[]);
src.expanded.put(src.front);
}
}
src.popFront();
src = src.lexCharacterLiteral(number.value, s);
number.isunsigned = false;
front = TOK.integer;
return;
default:
break;
}
}
}
goto Lident;
Lother:
front = TOK.other;
return;
case '\\':
// \u or \U could be start of identifier
src.popFront();
err_fatal("unrecognized preprocessor token x%02x", c);
assert(0); // not handled yet
case ESC.expand:
static if (isContext)
{
src.expanded.popBack();
src.popFront();
noExpand = true;
popFront();
noExpand = false;
return;
}
else
{
goto default;
}
default:
err_fatal("unrecognized preprocessor token x%02x", c);
src.popFront();
break;
}
}
}
}
auto createLexer(R)(R r)
{
Lexer!R lexer;
lexer.src = r;
// Temp buffers
lexer.stringbuf = Textbuf!(lexer.E,"str")(lexer.tmpbuf);
lexer.rescanbuffer = Textbuf!(uchar,"lrs")(lexer.tmpbuf3);
lexer.expbuffer = Textbuf!(uchar,"lex")(lexer.tmpbuf2);
lexer.argbuffer = Textbuf!(uchar,"lar")(lexer.tmpargbuf);
lexer.argsbuffer = Textbuf!(ustring,"lgs")(lexer.tmpargsbuf);
lexer.popFront(); // 'prime' the pump
return lexer;
}
unittest
{
{
auto s = cast(immutable(ubyte)[])(" \t\v\f\r" ~ ESC.space ~ ESC.brk);
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])(" + ++ += ");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.plus);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])(" - -- -= -> ->* ");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.minus);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])(" & && &= ");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.and);
lexer.popFront();
assert(lexer.front == TOK.andand);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])(" | || |= ");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.or);
lexer.popFront();
assert(lexer.front == TOK.oror);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])("(),?~{}[];:");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.lparen);
lexer.popFront();
assert(lexer.front == TOK.rparen);
lexer.popFront();
assert(lexer.front == TOK.comma);
lexer.popFront();
assert(lexer.front == TOK.question);
lexer.popFront();
assert(lexer.front == TOK.tilde);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.colon);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])("^^=**=%%=");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.xor);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.mul);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.mod);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])("> >= >>< <= << = == !!= . .. ... .*");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.gt);
lexer.popFront();
assert(lexer.front == TOK.ge);
lexer.popFront();
assert(lexer.front == TOK.shr);
lexer.popFront();
assert(lexer.front == TOK.lt);
lexer.popFront();
assert(lexer.front == TOK.le);
lexer.popFront();
assert(lexer.front == TOK.shl);
lexer.popFront();
assert(lexer.front == TOK.assign);
lexer.popFront();
assert(lexer.front == TOK.equal);
lexer.popFront();
assert(lexer.front == TOK.not);
lexer.popFront();
assert(lexer.front == TOK.notequal);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.dotdotdot);
lexer.popFront();
assert(lexer.front == TOK.other);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{
auto s = cast(immutable(ubyte)[])(" + // \n");
auto lexer = createLexer(s);
assert(!lexer.empty);
assert(lexer.front == TOK.plus);
lexer.popFront();
assert(lexer.front == TOK.eof);
}
{