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Coco.atg
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Coco.atg
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/*-------------------------------------------------------------------------
Coco.ATG -- Attributed Grammar
Compiler Generator Coco/R,
Copyright (c) 1990, 2004 Hanspeter Moessenboeck, University of Linz
extended by M. Loeberbauer & A. Woess, Univ. of Linz
ported to C++ by Csaba Balazs, University of Szeged
with improvements by Pat Terry, Rhodes University
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As an exception, it is allowed to write an extension of Coco/R that is
used as a plugin in non-free software.
If not otherwise stated, any source code generated by Coco/R (other than
Coco/R itself) does not fall under the GNU General Public License.
-------------------------------------------------------------------------*/
/*-------------------------------------------------------------------------
compile with:
Coco Coco.ATG -namespace Coco
-------------------------------------------------------------------------*/
$namespace=Coco
#include "Tab.h"
#include "DFA.h"
#include "ParserGen.h"
COMPILER Coco
int id;
int str;
FILE* trace; // other Coco objects referenced in this ATG
Tab *tab;
DFA *dfa;
ParserGen *pgen;
bool genScanner;
char* tokenString; // used in declarations of literal tokens
char* noString; // used in declarations of literal tokens
// This method will be called by the contructor if it exits.
// This support is specific to the C++ version of Coco/R.
void Init() {
tab = NULL;
dfa = NULL;
pgen = NULL;
id = 0;
str = 1;
tokenString = NULL;
noString = coco_string_create("-none-");
}
// Uncomment this method if cleanup is necessary,
// this method will be called by the destructor if it exists.
// This support is specific to the C++ version of Coco/R.
// void Destroy() {
// nothing to do
// }
/*-------------------------------------------------------------------------*/
CHARACTERS
letter = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_".
digit = "0123456789".
cr = '\r'.
lf = '\n'.
tab = '\t'.
stringCh = ANY - '"' - '\\' - cr - lf.
charCh = ANY - '\'' - '\\' - cr - lf.
printable = '\u0020' .. '\u007e'.
hex = "0123456789abcdef".
TOKENS
ident = letter { letter | digit }.
number = digit { digit }.
string = '"' { stringCh | '\\' printable } '"'.
badString = '"' { stringCh | '\\' printable } (cr | lf).
char = '\'' ( charCh | '\\' printable { hex } ) '\''.
PRAGMAS
ddtSym = '$' { digit | letter }. (. tab->SetDDT(la->val); .)
optionSym = '$' letter { letter } '='
{ digit | letter
| '-' | '.' | ':'
}. (. tab->SetOption(la->val); .)
COMMENTS FROM "/*" TO "*/" NESTED
COMMENTS FROM "//" TO lf
IGNORE cr + lf + tab
/*-------------------------------------------------------------------------*/
PRODUCTIONS
Coco (. Symbol *sym; Graph *g, *g1, *g2; char* gramName = NULL; CharSet *s; .)
=
(. int beg = la->pos; int line = la->line; .)
{ // this section can be used
// for #include statements
ANY
} (. if (la->pos != beg) {
pgen->usingPos = new Position(beg, t->pos + coco_string_length(t->val), 0, line);
}
.)
"COMPILER" (. genScanner = true;
tab->ignored = new CharSet(); .)
ident (. gramName = coco_string_create(t->val);
beg = la->pos;
line = la->line;
.)
{ ANY } (. tab->semDeclPos = new Position(beg, la->pos, 0, line); .)
[ "IGNORECASE" (. dfa->ignoreCase = true; .) ] /* pdt */
[ "CHARACTERS" { SetDecl }]
[ "TOKENS" { TokenDecl<Node::t> }]
[ "PRAGMAS" { TokenDecl<Node::pr> }]
{ "COMMENTS" (. bool nested = false; .)
"FROM" TokenExpr<g1>
"TO" TokenExpr<g2>
[ "NESTED" (. nested = true; .)
] (. dfa->NewComment(g1->l, g2->l, nested); .)
}
{ "IGNORE" Set<s> (. tab->ignored->Or(s); .)
}
SYNC
"PRODUCTIONS" (. if (genScanner) dfa->MakeDeterministic();
tab->DeleteNodes();
.)
{ ident (. sym = tab->FindSym(t->val);
bool undef = (sym == NULL);
if (undef) sym = tab->NewSym(Node::nt, t->val, t->line);
else {
if (sym->typ == Node::nt) {
if (sym->graph != NULL) SemErr("name declared twice");
} else SemErr("this symbol kind not allowed on left side of production");
sym->line = t->line;
}
bool noAttrs = (sym->attrPos == NULL);
sym->attrPos = NULL;
.)
[ AttrDecl<sym> ] (. if (!undef)
if (noAttrs != (sym->attrPos == NULL))
SemErr("attribute mismatch between declaration and use of this symbol");
.)
[ SemText<.sym->semPos.> ] WEAK
'='
Expression<g> (. sym->graph = g->l;
tab->Finish(g);
.)
WEAK
'.'
}
"END" ident (. if (!coco_string_equal(gramName, t->val))
SemErr("name does not match grammar name");
tab->gramSy = tab->FindSym(gramName);
if (tab->gramSy == NULL)
SemErr("missing production for grammar name");
else {
sym = tab->gramSy;
if (sym->attrPos != NULL)
SemErr("grammar symbol must not have attributes");
}
tab->noSym = tab->NewSym(Node::t, "???", 0); // noSym gets highest number
tab->SetupAnys();
tab->RenumberPragmas();
if (tab->ddt[2]) tab->PrintNodes();
if (errors->count == 0) {
printf("checking\n");
tab->CompSymbolSets();
if (tab->ddt[7]) tab->XRef();
if (tab->GrammarOk()) {
printf("parser");
pgen->WriteParser();
if (genScanner) {
printf(" + scanner");
dfa->WriteScanner();
if (tab->ddt[0]) dfa->PrintStates();
}
printf(" generated\n");
if (tab->ddt[8]) pgen->WriteStatistics();
}
}
if (tab->ddt[6]) tab->PrintSymbolTable();
.)
'.'
.
/*------------------------------------------------------------------------------------*/
SetDecl (. CharSet *s; .)
=
ident (. char *name = coco_string_create(t->val);
CharClass *c = tab->FindCharClass(name);
if (c != NULL) SemErr("name declared twice");
.)
'=' Set<s> (. if (s->Elements() == 0) SemErr("character set must not be empty");
tab->NewCharClass(name, s);
.)
'.'
.
/*------------------------------------------------------------------------------------*/
Set<CharSet* &s> (. CharSet *s2; .)
=
SimSet<s>
{ '+' SimSet<s2> (. s->Or(s2); .)
| '-' SimSet<s2> (. s->Subtract(s2); .)
}
.
/*------------------------------------------------------------------------------------*/
SimSet<CharSet* &s> (. int n1, n2; .)
= (. s = new CharSet(); .)
( ident (. CharClass *c = tab->FindCharClass(t->val);
if (c == NULL) SemErr("undefined name"); else s->Or(c->set);
.)
| string (.
char *subName2 = coco_string_create(t->val, 1, coco_string_length(t->val)-2);
char *name = tab->Unescape(subName2);
coco_string_delete(subName2);
char ch;
int len = coco_string_length(name);
for(int i=0; i < len; i++) {
ch = name[i];
if (dfa->ignoreCase) {
if (('A' <= ch) && (ch <= 'Z')) ch = ch - ('A' - 'a'); // ch.ToLower()
}
s->Set(ch);
}
coco_string_delete(name);
.)
| Char<n1> (. s->Set(n1); .)
[ ".." Char<n2> (. for (int i = n1; i <= n2; i++) s->Set(i); .)
]
| "ANY" (. s = new CharSet(); s->Fill(); .)
)
.
/*--------------------------------------------------------------------------------------*/
Char<int &n>
=
char (. n = 0;
char* subName = coco_string_create(t->val, 1, coco_string_length(t->val)-2);
char* name = tab->Unescape(subName);
coco_string_delete(subName);
// "<= 1" instead of "== 1" to allow the escape sequence '\0' in c++
if (coco_string_length(name) <= 1) n = name[0];
else SemErr("unacceptable character value");
coco_string_delete(name);
if (dfa->ignoreCase && (((char) n) >= 'A') && (((char) n) <= 'Z')) n += 32;
.)
.
/*------------------------------------------------------------------------------------*/
TokenDecl<int typ> (. char* name = NULL; int kind; Symbol *sym; Graph *g; .)
=
Sym<name, kind> (. sym = tab->FindSym(name);
if (sym != NULL) SemErr("name declared twice");
else {
sym = tab->NewSym(typ, name, t->line);
sym->tokenKind = Symbol::fixedToken;
}
tokenString = NULL;
.)
SYNC
( '=' TokenExpr<g> '.' (. if (kind == str) SemErr("a literal must not be declared with a structure");
tab->Finish(g);
if (tokenString == NULL || coco_string_equal(tokenString, noString))
dfa->ConvertToStates(g->l, sym);
else { // TokenExpr is a single string
if ((*(tab->literals))[tokenString] != NULL)
SemErr("token string declared twice");
tab->literals->Set(tokenString, sym);
dfa->MatchLiteral(tokenString, sym);
}
.)
| (. if (kind == id) genScanner = false;
else dfa->MatchLiteral(sym->name, sym);
.)
)
[ SemText<.sym->semPos.> (. if (typ != Node::pr) SemErr("semantic action not allowed here"); .)
]
.
/*------------------------------------------------------------------------------------*/
AttrDecl<Symbol *sym>
=
'<' (. int beg = la->pos; int col = la->col; int line = la->line; .)
{ ANY
| badString (. SemErr("bad string in attributes"); .)
}
'>' (. if (t->pos > beg)
sym->attrPos = new Position(beg, t->pos, col, line); .)
| "<." (. int beg = la->pos; int col = la->col; int line = la->line; .)
{ ANY
| badString (. SemErr("bad string in attributes"); .)
}
".>" (. if (t->pos > beg)
sym->attrPos = new Position(beg, t->pos, col, line); .)
.
/*------------------------------------------------------------------------------------*/
Expression<Graph* &g> (. Graph *g2; .)
=
Term<g> (. bool first = true; .)
{ WEAK
'|'
Term<g2> (. if (first) { tab->MakeFirstAlt(g); first = false; }
tab->MakeAlternative(g, g2);
.)
}
.
/*------------------------------------------------------------------------------------*/
Term<Graph* &g> (. Graph *g2; Node *rslv = NULL; g = NULL; .)
=
( [ (. rslv = tab->NewNode(Node::rslv, (Symbol*)NULL, la->line); .)
Resolver<.rslv->pos.> (. g = new Graph(rslv); .)
]
Factor<g2> (. if (rslv != NULL) tab->MakeSequence(g, g2);
else g = g2; .)
{ Factor<g2> (. tab->MakeSequence(g, g2); .)
}
| (. g = new Graph(tab->NewNode(Node::eps, (Symbol*)NULL, 0)); .)
) (. if (g == NULL) // invalid start of Term
g = new Graph(tab->NewNode(Node::eps, (Symbol*)NULL, 0)); .)
.
/*------------------------------------------------------------------------------------*/
Factor<Graph* &g> (. char* name = NULL; int kind; Position *pos; bool weak = false;
g = NULL;
.)
=
( [ "WEAK" (. weak = true; .)
]
Sym<name, kind> (. Symbol *sym = tab->FindSym(name);
if (sym == NULL && kind == str)
sym = (Symbol*)((*(tab->literals))[name]);
bool undef = (sym == NULL);
if (undef) {
if (kind == id)
sym = tab->NewSym(Node::nt, name, 0); // forward nt
else if (genScanner) {
sym = tab->NewSym(Node::t, name, t->line);
dfa->MatchLiteral(sym->name, sym);
} else { // undefined string in production
SemErr("undefined string in production");
sym = tab->eofSy; // dummy
}
}
int typ = sym->typ;
if (typ != Node::t && typ != Node::nt)
SemErr("this symbol kind is not allowed in a production");
if (weak) {
if (typ == Node::t) typ = Node::wt;
else SemErr("only terminals may be weak");
}
Node *p = tab->NewNode(typ, sym, t->line);
g = new Graph(p);
.)
[ Attribs<p> (. if (kind != id) SemErr("a literal must not have attributes"); .)
] (. if (undef)
sym->attrPos = p->pos; // dummy
else if ((p->pos == NULL) != (sym->attrPos == NULL))
SemErr("attribute mismatch between declaration and use of this symbol");
.)
| '(' Expression<g> ')'
| '[' Expression<g> ']' (. tab->MakeOption(g); .)
| '{' Expression<g> '}' (. tab->MakeIteration(g); .)
| SemText<pos> (. Node *p = tab->NewNode(Node::sem, (Symbol*)NULL, 0);
p->pos = pos;
g = new Graph(p);
.)
| "ANY" (. Node *p = tab->NewNode(Node::any, (Symbol*)NULL, 0); // p.set is set in tab->SetupAnys
g = new Graph(p);
.)
| "SYNC" (. Node *p = tab->NewNode(Node::sync, (Symbol*)NULL, 0);
g = new Graph(p);
.)
) (. if (g == NULL) // invalid start of Factor
g = new Graph(tab->NewNode(Node::eps, (Symbol*)NULL, 0));
.)
.
/*------------------------------------------------------------------------------------*/
Resolver<Position* &pos>
=
"IF" "(" (. int beg = la->pos; int col = la->col; int line = la->line; .)
Condition (. pos = new Position(beg, t->pos, col, line); .)
.
/*------------------------------------------------------------------------------------*/
Condition = { "(" Condition | ANY } ")" .
/*------------------------------------------------------------------------------------*/
TokenExpr<Graph* &g> (. Graph *g2; .)
=
TokenTerm<g> (. bool first = true; .)
{ WEAK
'|'
TokenTerm<g2> (. if (first) { tab->MakeFirstAlt(g); first = false; }
tab->MakeAlternative(g, g2);
.)
}
.
/*------------------------------------------------------------------------------------*/
TokenTerm<Graph* &g> (. Graph *g2; .)
=
TokenFactor<g>
{ TokenFactor<g2> (. tab->MakeSequence(g, g2); .)
}
[ "CONTEXT"
'(' TokenExpr<g2> (. tab->SetContextTrans(g2->l); dfa->hasCtxMoves = true;
tab->MakeSequence(g, g2); .)
')'
]
.
/*------------------------------------------------------------------------------------*/
TokenFactor<Graph* &g> (. char* name = NULL; int kind; .)
=
(. g = NULL; .)
( Sym<name, kind> (. if (kind == id) {
CharClass *c = tab->FindCharClass(name);
if (c == NULL) {
SemErr("undefined name");
c = tab->NewCharClass(name, new CharSet());
}
Node *p = tab->NewNode(Node::clas, (Symbol*)NULL, 0); p->val = c->n;
g = new Graph(p);
tokenString = coco_string_create(noString);
} else { // str
g = tab->StrToGraph(name);
if (tokenString == NULL) tokenString = coco_string_create(name);
else tokenString = coco_string_create(noString);
}
.)
| '(' TokenExpr<g> ')'
| '[' TokenExpr<g> ']' (. tab->MakeOption(g); tokenString = coco_string_create(noString); .)
| '{' TokenExpr<g> '}' (. tab->MakeIteration(g); tokenString = coco_string_create(noString); .)
) (. if (g == NULL) // invalid start of TokenFactor
g = new Graph(tab->NewNode(Node::eps, (Symbol*)NULL, 0)); .)
.
/*------------------------------------------------------------------------------------*/
Sym<char* &name, int &kind>
= (. name = coco_string_create("???"); kind = id; .)
( ident (. kind = id; coco_string_delete(name); name = coco_string_create(t->val); .)
| (string (. coco_string_delete(name); name = coco_string_create(t->val); .)
| char (.
char *subName = coco_string_create(t->val, 1, coco_string_length(t->val)-2);
coco_string_delete(name);
name = coco_string_create_append("\"", subName);
coco_string_delete(subName);
coco_string_merge(name, "\"");
.)
) (. kind = str;
if (dfa->ignoreCase) {
char *oldName = name;
name = coco_string_create_lower(name);
coco_string_delete(oldName);
}
if (coco_string_indexof(name, ' ') >= 0)
SemErr("literal tokens must not contain blanks"); .)
)
.
/*------------------------------------------------------------------------------------*/
Attribs<Node *p>
=
'<' (. int beg = la->pos; int col = la->col; int line = la->line; .)
{ ANY
| badString (. SemErr("bad string in attributes"); .)
}
'>' (. if (t->pos > beg) p->pos = new Position(beg, t->pos, col, line); .)
| "<." (. int beg = la->pos; int col = la->col; int line = la->line; .)
{ ANY
| badString (. SemErr("bad string in attributes"); .)
}
".>" (. if (t->pos > beg) p->pos = new Position(beg, t->pos, col, line); .)
.
/*------------------------------------------------------------------------------------*/
SemText<Position* &pos>
=
"(." (. int beg = la->pos; int col = la->col; int line = t->line; .)
{ ANY
| badString (. SemErr("bad string in semantic action"); .)
| "(." (. SemErr("missing end of previous semantic action"); .)
}
".)" (. pos = new Position(beg, t->pos, col, line); .)
.
/*------------------------------------------------------------------------------------*/
END Coco.