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lexer.c
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lexer.c
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2011 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
/* Lexical Analyzer */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#include <errno.h>
#include <wchar.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h> // for time() and ctime()
#include "rmem.h"
#include "stringtable.h"
#include "lexer.h"
#include "utf.h"
#include "identifier.h"
#include "id.h"
#include "module.h"
#if _WIN32 && __DMC__
// from \dm\src\include\setlocal.h
extern "C" char * __cdecl __locale_decpoint;
#endif
extern int HtmlNamedEntity(unsigned char *p, int length);
#define LS 0x2028 // UTF line separator
#define PS 0x2029 // UTF paragraph separator
void unittest_lexer();
/********************************************
* Do our own char maps
*/
static unsigned char cmtable[256];
const int CMoctal = 0x1;
const int CMhex = 0x2;
const int CMidchar = 0x4;
inline unsigned char isoctal (unsigned char c) { return cmtable[c] & CMoctal; }
inline unsigned char ishex (unsigned char c) { return cmtable[c] & CMhex; }
inline unsigned char isidchar(unsigned char c) { return cmtable[c] & CMidchar; }
static void cmtable_init()
{
for (unsigned c = 0; c < sizeof(cmtable) / sizeof(cmtable[0]); c++)
{
if ('0' <= c && c <= '7')
cmtable[c] |= CMoctal;
if (isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F'))
cmtable[c] |= CMhex;
if (isalnum(c) || c == '_')
cmtable[c] |= CMidchar;
}
}
/************************* Token **********************************************/
const char *Token::tochars[TOKMAX];
void *Token::operator new(size_t size)
{ Token *t;
if (Lexer::freelist)
{
t = Lexer::freelist;
Lexer::freelist = t->next;
return t;
}
return ::operator new(size);
}
#ifdef DEBUG
void Token::print()
{
fprintf(stdmsg, "%s\n", toChars());
}
#endif
const char *Token::toChars()
{ const char *p;
static char buffer[3 + 3 * sizeof(float80value) + 1];
p = buffer;
switch (value)
{
case TOKint32v:
#if IN_GCC
sprintf(buffer,"%d",(d_int32)int64value);
#else
sprintf(buffer,"%d",int32value);
#endif
break;
case TOKuns32v:
case TOKcharv:
case TOKwcharv:
case TOKdcharv:
#if IN_GCC
sprintf(buffer,"%uU",(d_uns32)uns64value);
#else
sprintf(buffer,"%uU",uns32value);
#endif
break;
case TOKint64v:
sprintf(buffer,"%lldL",(intmax_t)int64value);
break;
case TOKuns64v:
sprintf(buffer,"%lluUL",(uintmax_t)uns64value);
break;
#if IN_GCC
case TOKfloat32v:
case TOKfloat64v:
case TOKfloat80v:
float80value.format(buffer, sizeof(buffer));
break;
case TOKimaginary32v:
case TOKimaginary64v:
case TOKimaginary80v:
float80value.format(buffer, sizeof(buffer));
// %% buffer
strcat(buffer, "i");
break;
#else
case TOKfloat32v:
ld_sprint(buffer, 'g', float80value);
strcat(buffer, "f");
break;
case TOKfloat64v:
ld_sprint(buffer, 'g', float80value);
break;
case TOKfloat80v:
ld_sprint(buffer, 'g', float80value);
strcat(buffer, "L");
break;
case TOKimaginary32v:
ld_sprint(buffer, 'g', float80value);
strcat(buffer, "fi");
break;
case TOKimaginary64v:
ld_sprint(buffer, 'g', float80value);
strcat(buffer, "i");
break;
case TOKimaginary80v:
ld_sprint(buffer, 'g', float80value);
strcat(buffer, "Li");
break;
#endif
case TOKstring:
#if CSTRINGS
p = string;
#else
{ OutBuffer buf;
buf.writeByte('"');
for (size_t i = 0; i < len; )
{ unsigned c;
utf_decodeChar((unsigned char *)ustring, len, &i, &c);
switch (c)
{
case 0:
break;
case '"':
case '\\':
buf.writeByte('\\');
default:
if (isprint(c))
buf.writeByte(c);
else if (c <= 0x7F)
buf.printf("\\x%02x", c);
else if (c <= 0xFFFF)
buf.printf("\\u%04x", c);
else
buf.printf("\\U%08x", c);
continue;
}
break;
}
buf.writeByte('"');
if (postfix)
buf.writeByte('"');
buf.writeByte(0);
p = (char *)buf.extractData();
}
#endif
break;
case TOKidentifier:
case TOKenum:
case TOKstruct:
case TOKimport:
case BASIC_TYPES:
p = ident->toChars();
break;
default:
p = toChars(value);
break;
}
return p;
}
const char *Token::toChars(enum TOK value)
{ const char *p;
static char buffer[3 + 3 * sizeof(value) + 1];
p = tochars[value];
if (!p)
{ sprintf(buffer,"TOK%d",value);
p = buffer;
}
return p;
}
/*************************** Lexer ********************************************/
Token *Lexer::freelist = NULL;
StringTable Lexer::stringtable;
OutBuffer Lexer::stringbuffer;
Lexer::Lexer(Module *mod,
unsigned char *base, unsigned begoffset, unsigned endoffset,
int doDocComment, int commentToken)
: loc(mod, 1)
{
//printf("Lexer::Lexer(%p,%d)\n",base,length);
//printf("lexer.mod = %p, %p\n", mod, this->loc.mod);
memset(&token,0,sizeof(token));
this->base = base;
this->end = base + endoffset;
p = base + begoffset;
this->mod = mod;
this->doDocComment = doDocComment;
this->anyToken = 0;
this->commentToken = commentToken;
//initKeywords();
/* If first line starts with '#!', ignore the line
*/
if (p[0] == '#' && p[1] =='!')
{
p += 2;
while (1)
{ unsigned char c = *p;
switch (c)
{
case '\n':
p++;
break;
case '\r':
p++;
if (*p == '\n')
p++;
break;
case 0:
case 0x1A:
break;
default:
if (c & 0x80)
{ unsigned u = decodeUTF();
if (u == PS || u == LS)
break;
}
p++;
continue;
}
break;
}
loc.linnum = 2;
}
}
void Lexer::error(const char *format, ...)
{
va_list ap;
va_start(ap, format);
verror(loc, format, ap);
va_end(ap);
}
void Lexer::error(Loc loc, const char *format, ...)
{
va_list ap;
va_start(ap, format);
verror(loc, format, ap);
va_end(ap);
}
void Lexer::verror(Loc loc, const char *format, va_list ap)
{
if (mod && !global.gag)
{
char *p = loc.toChars();
if (*p)
fprintf(stdmsg, "%s: ", p);
mem.free(p);
vfprintf(stdmsg, format, ap);
fprintf(stdmsg, "\n");
fflush(stdmsg);
if (global.errors >= 20) // moderate blizzard of cascading messages
fatal();
}
else
{
global.gaggedErrors++;
}
global.errors++;
}
TOK Lexer::nextToken()
{ Token *t;
if (token.next)
{
t = token.next;
memcpy(&token,t,sizeof(Token));
t->next = freelist;
freelist = t;
}
else
{
scan(&token);
}
//token.print();
return token.value;
}
Token *Lexer::peek(Token *ct)
{ Token *t;
if (ct->next)
t = ct->next;
else
{
t = new Token();
scan(t);
ct->next = t;
}
return t;
}
/***********************
* Look ahead at next token's value.
*/
TOK Lexer::peekNext()
{
return peek(&token)->value;
}
/***********************
* Look 2 tokens ahead at value.
*/
TOK Lexer::peekNext2()
{
Token *t = peek(&token);
return peek(t)->value;
}
/*********************************
* tk is on the opening (.
* Look ahead and return token that is past the closing ).
*/
Token *Lexer::peekPastParen(Token *tk)
{
//printf("peekPastParen()\n");
int parens = 1;
int curlynest = 0;
while (1)
{
tk = peek(tk);
//tk->print();
switch (tk->value)
{
case TOKlparen:
parens++;
continue;
case TOKrparen:
--parens;
if (parens)
continue;
tk = peek(tk);
break;
case TOKlcurly:
curlynest++;
continue;
case TOKrcurly:
if (--curlynest >= 0)
continue;
break;
case TOKsemicolon:
if (curlynest)
continue;
break;
case TOKeof:
break;
default:
continue;
}
return tk;
}
}
/**********************************
* Determine if string is a valid Identifier.
* Placed here because of commonality with Lexer functionality.
* Returns:
* 0 invalid
*/
int Lexer::isValidIdentifier(char *p)
{
size_t len;
size_t idx;
if (!p || !*p)
goto Linvalid;
if (*p >= '0' && *p <= '9') // beware of isdigit() on signed chars
goto Linvalid;
len = strlen(p);
idx = 0;
while (p[idx])
{ dchar_t dc;
const char *q = utf_decodeChar((unsigned char *)p, len, &idx, &dc);
if (q)
goto Linvalid;
if (!((dc >= 0x80 && isUniAlpha(dc)) || isalnum(dc) || dc == '_'))
goto Linvalid;
}
return 1;
Linvalid:
return 0;
}
/****************************
* Turn next token in buffer into a token.
*/
void Lexer::scan(Token *t)
{
unsigned lastLine = loc.linnum;
unsigned linnum;
t->blockComment = NULL;
t->lineComment = NULL;
while (1)
{
t->ptr = p;
//printf("p = %p, *p = '%c'\n",p,*p);
switch (*p)
{
case 0:
case 0x1A:
t->value = TOKeof; // end of file
return;
case ' ':
case '\t':
case '\v':
case '\f':
p++;
continue; // skip white space
case '\r':
p++;
if (*p != '\n') // if CR stands by itself
loc.linnum++;
continue; // skip white space
case '\n':
p++;
loc.linnum++;
continue; // skip white space
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
t->value = number(t);
return;
#if CSTRINGS
case '\'':
t->value = charConstant(t, 0);
return;
case '"':
t->value = stringConstant(t,0);
return;
case 'l':
case 'L':
if (p[1] == '\'')
{
p++;
t->value = charConstant(t, 1);
return;
}
else if (p[1] == '"')
{
p++;
t->value = stringConstant(t, 1);
return;
}
#else
case '\'':
t->value = charConstant(t,0);
return;
case 'r':
if (p[1] != '"')
goto case_ident;
p++;
case '`':
t->value = wysiwygStringConstant(t, *p);
return;
case 'x':
if (p[1] != '"')
goto case_ident;
p++;
t->value = hexStringConstant(t);
return;
#if DMDV2
case 'q':
if (p[1] == '"')
{
p++;
t->value = delimitedStringConstant(t);
return;
}
else if (p[1] == '{')
{
p++;
t->value = tokenStringConstant(t);
return;
}
else
goto case_ident;
#endif
case '"':
t->value = escapeStringConstant(t,0);
return;
#if ! TEXTUAL_ASSEMBLY_OUT
case '\\': // escaped string literal
{ unsigned c;
unsigned char *pstart = p;
stringbuffer.reset();
do
{
p++;
switch (*p)
{
case 'u':
case 'U':
case '&':
c = escapeSequence();
stringbuffer.writeUTF8(c);
break;
default:
c = escapeSequence();
stringbuffer.writeByte(c);
break;
}
} while (*p == '\\');
t->len = stringbuffer.offset;
stringbuffer.writeByte(0);
t->ustring = (unsigned char *)mem.malloc(stringbuffer.offset);
memcpy(t->ustring, stringbuffer.data, stringbuffer.offset);
t->postfix = 0;
t->value = TOKstring;
#if DMDV2
if (!global.params.useDeprecated)
error("Escape String literal %.*s is deprecated, use double quoted string literal \"%.*s\" instead", p - pstart, pstart, p - pstart, pstart);
#endif
return;
}
#endif
case 'l':
case 'L':
#endif
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'm': case 'n': case 'o':
#if DMDV2
case 'p': /*case 'q': case 'r':*/ case 's': case 't':
#else
case 'p': case 'q': /*case 'r':*/ case 's': case 't':
#endif
case 'u': case 'v': case 'w': /*case 'x':*/ case 'y':
case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
case '_':
case_ident:
{ unsigned char c;
while (1)
{
c = *++p;
if (isidchar(c))
continue;
else if (c & 0x80)
{ unsigned char *s = p;
unsigned u = decodeUTF();
if (isUniAlpha(u))
continue;
error("char 0x%04x not allowed in identifier", u);
p = s;
}
break;
}
StringValue *sv = stringtable.update((char *)t->ptr, p - t->ptr);
Identifier *id = (Identifier *) sv->ptrvalue;
if (!id)
{ id = new Identifier(sv->lstring.string,TOKidentifier);
sv->ptrvalue = id;
}
t->ident = id;
t->value = (enum TOK) id->value;
anyToken = 1;
if (*t->ptr == '_') // if special identifier token
{
static char date[11+1];
static char time[8+1];
static char timestamp[24+1];
if (!date[0]) // lazy evaluation
{ time_t t;
char *p;
::time(&t);
p = ctime(&t);
assert(p);
sprintf(date, "%.6s %.4s", p + 4, p + 20);
sprintf(time, "%.8s", p + 11);
sprintf(timestamp, "%.24s", p);
}
#if DMDV1
if (mod && id == Id::FILE)
{
t->ustring = (unsigned char *)(loc.filename ? loc.filename : mod->ident->toChars());
goto Lstr;
}
else if (mod && id == Id::LINE)
{
t->value = TOKint64v;
t->uns64value = loc.linnum;
}
else
#endif
if (id == Id::DATE)
{
t->ustring = (unsigned char *)date;
goto Lstr;
}
else if (id == Id::TIME)
{
t->ustring = (unsigned char *)time;
goto Lstr;
}
else if (id == Id::VENDOR)
{
t->ustring = (unsigned char *)"Digital Mars D";
goto Lstr;
}
else if (id == Id::TIMESTAMP)
{
t->ustring = (unsigned char *)timestamp;
Lstr:
t->value = TOKstring;
t->postfix = 0;
t->len = strlen((char *)t->ustring);
}
else if (id == Id::VERSIONX)
{ unsigned major = 0;
unsigned minor = 0;
for (const char *p = global.version + 1; 1; p++)
{
char c = *p;
if (isdigit((unsigned char)c))
minor = minor * 10 + c - '0';
else if (c == '.')
{ major = minor;
minor = 0;
}
else
break;
}
t->value = TOKint64v;
t->uns64value = major * 1000 + minor;
}
#if DMDV2
else if (id == Id::EOFX)
{
t->value = TOKeof;
// Advance scanner to end of file
while (!(*p == 0 || *p == 0x1A))
p++;
}
#endif
}
//printf("t->value = %d\n",t->value);
return;
}
case '/':
p++;
switch (*p)
{
case '=':
p++;
t->value = TOKdivass;
return;
case '*':
p++;
linnum = loc.linnum;
while (1)
{
while (1)
{ unsigned char c = *p;
switch (c)
{
case '/':
break;
case '\n':
loc.linnum++;
p++;
continue;
case '\r':
p++;
if (*p != '\n')
loc.linnum++;
continue;
case 0:
case 0x1A:
error("unterminated /* */ comment");
p = end;
t->value = TOKeof;
return;
default:
if (c & 0x80)
{ unsigned u = decodeUTF();
if (u == PS || u == LS)
loc.linnum++;
}
p++;
continue;
}
break;
}
p++;
if (p[-2] == '*' && p - 3 != t->ptr)
break;
}
if (commentToken)
{
t->value = TOKcomment;
return;
}
else if (doDocComment && t->ptr[2] == '*' && p - 4 != t->ptr)
{ // if /** but not /**/
getDocComment(t, lastLine == linnum);
}
continue;
case '/': // do // style comments
linnum = loc.linnum;
while (1)
{ unsigned char c = *++p;
switch (c)
{
case '\n':
break;
case '\r':
if (p[1] == '\n')
p++;
break;
case 0:
case 0x1A:
if (commentToken)
{
p = end;
t->value = TOKcomment;
return;
}
if (doDocComment && t->ptr[2] == '/')
getDocComment(t, lastLine == linnum);
p = end;
t->value = TOKeof;
return;
default:
if (c & 0x80)
{ unsigned u = decodeUTF();
if (u == PS || u == LS)
break;
}
continue;
}
break;
}
if (commentToken)
{
p++;
loc.linnum++;
t->value = TOKcomment;
return;
}
if (doDocComment && t->ptr[2] == '/')
getDocComment(t, lastLine == linnum);
p++;
loc.linnum++;
continue;
case '+':
{ int nest;
linnum = loc.linnum;
p++;
nest = 1;
while (1)
{ unsigned char c = *p;
switch (c)
{
case '/':
p++;
if (*p == '+')
{
p++;
nest++;
}
continue;
case '+':
p++;
if (*p == '/')
{
p++;
if (--nest == 0)
break;
}
continue;
case '\r':
p++;
if (*p != '\n')
loc.linnum++;
continue;
case '\n':
loc.linnum++;
p++;
continue;
case 0:
case 0x1A:
error("unterminated /+ +/ comment");
p = end;
t->value = TOKeof;
return;
default:
if (c & 0x80)
{ unsigned u = decodeUTF();
if (u == PS || u == LS)
loc.linnum++;
}
p++;
continue;
}
break;
}
if (commentToken)
{
t->value = TOKcomment;
return;
}
if (doDocComment && t->ptr[2] == '+' && p - 4 != t->ptr)
{ // if /++ but not /++/
getDocComment(t, lastLine == linnum);
}
continue;
}
}
t->value = TOKdiv;
return;
case '.':
p++;
if (isdigit(*p))
{ /* Note that we don't allow ._1 and ._ as being
* valid floating point numbers.
*/
p--;
t->value = inreal(t);
}
else if (p[0] == '.')
{
if (p[1] == '.')
{ p += 2;
t->value = TOKdotdotdot;
}
else
{ p++;
t->value = TOKslice;
}
}
else
t->value = TOKdot;
return;
case '&':
p++;
if (*p == '=')
{ p++;
t->value = TOKandass;
}
else if (*p == '&')
{ p++;
t->value = TOKandand;
}
else
t->value = TOKand;
return;
case '|':
p++;
if (*p == '=')
{ p++;
t->value = TOKorass;