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Tab.cpp
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Tab.cpp
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/*-------------------------------------------------------------------------
Tab -- Symbol Table Management
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.
-------------------------------------------------------------------------*/
#include "Tab.h"
#include "Parser.h"
#include "BitArray.h"
#include "Scanner.h"
namespace Coco {
const char* Tab::nTyp[] =
{" ", "t ", "pr ", "nt ", "clas", "chr ", "wt ", "any ", "eps ",
"sync", "sem ", "alt ", "iter", "opt ", "rslv"};
const char* Tab::tKind[] = {"fixedToken", "classToken", "litToken", "classLitToken"};
Tab::Tab(Parser *parser) {
for (int i=0; i<10; i++) ddt[i] = false;
terminals = new ArrayList();
pragmas = new ArrayList();
nonterminals = new ArrayList();
nodes = new ArrayList();
dummyNode = NULL;
classes= new ArrayList();
dummyName = 'A';
this->parser = parser;
trace = parser->trace;
errors = parser->errors;
eofSy = NewSym(Node::t, "EOF", 0);
dummyNode = NewNode(Node::eps, (Symbol*)NULL, 0);
literals = new HashTable();
checkEOF = true;
}
Symbol* Tab::NewSym(int typ, const char* name, int line) {
if (coco_string_length(name) == 2 && name[0] == '"') {
parser->SemErr("empty token not allowed");
name = coco_string_create("???");
}
Symbol *sym = new Symbol(typ, name, line);
if (typ == Node::t) {
sym->n = terminals->Count; terminals->Add(sym);
} else if (typ == Node::pr) {
pragmas->Add(sym);
} else if (typ == Node::nt) {
sym->n = nonterminals->Count; nonterminals->Add(sym);
}
return sym;
}
Symbol* Tab::FindSym(const char* name) {
Symbol *s;
int i;
for (i=0; i<terminals->Count; i++) {
s = (Symbol*)((*terminals)[i]);
if (coco_string_equal(s->name, name)) return s;
}
for (i=0; i<nonterminals->Count; i++) {
s = (Symbol*)((*nonterminals)[i]);
if (coco_string_equal(s->name, name)) return s;
}
return NULL;
}
int Tab::Num(Node *p) {
if (p == NULL) return 0; else return p->n;
}
void Tab::PrintSym(Symbol *sym) {
char *paddedName = Name(sym->name);
fprintf(trace, "%3d %14s %s", sym->n, paddedName, nTyp[sym->typ]);
coco_string_delete(paddedName);
if (sym->attrPos==NULL) fprintf(trace, " false "); else fprintf(trace, " true ");
if (sym->typ == Node::nt) {
fprintf(trace, "%5d", Num(sym->graph));
if (sym->deletable) fprintf(trace, " true "); else fprintf(trace, " false ");
} else
fprintf(trace, " ");
fprintf(trace, "%5d %s\n", sym->line, tKind[sym->tokenKind]);
}
void Tab::PrintSymbolTable() {
fprintf(trace, "Symbol Table:\n");
fprintf(trace, "------------\n\n");
fprintf(trace, " nr name typ hasAt graph del line tokenKind\n");
Symbol *sym;
int i;
for (i=0; i<terminals->Count; i++) {
sym = (Symbol*)((*terminals)[i]);
PrintSym(sym);
}
for (i=0; i<pragmas->Count; i++) {
sym = (Symbol*)((*pragmas)[i]);
PrintSym(sym);
}
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
PrintSym(sym);
}
fprintf(trace, "\nLiteral Tokens:\n");
fprintf(trace, "--------------\n");
Iterator *iter = literals->GetIterator();
while (iter->HasNext()) {
DictionaryEntry *e = iter->Next();
fprintf(trace, "_%s = %s.\n", ((Symbol*) (e->val))->name, e->key);
}
fprintf(trace, "\n");
}
void Tab::PrintSet(BitArray *s, int indent) {
int col, len;
col = indent;
Symbol *sym;
for (int i=0; i<terminals->Count; i++) {
sym = (Symbol*)((*terminals)[i]);
if ((*s)[sym->n]) {
len = coco_string_length(sym->name);
if (col + len >= 80) {
fprintf(trace, "\n");
for (col = 1; col < indent; col++) fprintf(trace, " ");
}
fprintf(trace, "%s ", sym->name);
col += len + 1;
}
}
if (col == indent) fprintf(trace, "-- empty set --");
fprintf(trace, "\n");
}
//---------------------------------------------------------------------
// Syntax graph management
//---------------------------------------------------------------------
Node* Tab::NewNode(int typ, Symbol *sym, int line) {
Node* node = new Node(typ, sym, line);
node->n = nodes->Count;
nodes->Add(node);
return node;
}
Node* Tab::NewNode(int typ, Node* sub) {
Node* node = NewNode(typ, (Symbol*)NULL, 0);
node->sub = sub;
return node;
}
Node* Tab::NewNode(int typ, int val, int line) {
Node* node = NewNode(typ, (Symbol*)NULL, line);
node->val = val;
return node;
}
void Tab::MakeFirstAlt(Graph *g) {
g->l = NewNode(Node::alt, g->l); g->l->line = g->l->sub->line;
g->r->up = true;
g->l->next = g->r;
g->r = g->l;
}
// The result will be in g1
void Tab::MakeAlternative(Graph *g1, Graph *g2) {
g2->l = NewNode(Node::alt, g2->l); g2->l->line = g2->l->sub->line;
g2->l->up = true;
g2->r->up = true;
Node *p = g1->l; while (p->down != NULL) p = p->down;
p->down = g2->l;
p = g1->r; while (p->next != NULL) p = p->next;
// append alternative to g1 end list
p->next = g2->l;
// append g2 end list to g1 end list
g2->l->next = g2->r;
}
// The result will be in g1
void Tab::MakeSequence(Graph *g1, Graph *g2) {
Node *p = g1->r->next; g1->r->next = g2->l; // link head node
while (p != NULL) { // link substructure
Node *q = p->next; p->next = g2->l;
p = q;
}
g1->r = g2->r;
}
void Tab::MakeIteration(Graph *g) {
g->l = NewNode(Node::iter, g->l);
g->r->up = true;
Node *p = g->r;
g->r = g->l;
while (p != NULL) {
Node *q = p->next; p->next = g->l;
p = q;
}
}
void Tab::MakeOption(Graph *g) {
g->l = NewNode(Node::opt, g->l);
g->r->up = true;
g->l->next = g->r;
g->r = g->l;
}
void Tab::Finish(Graph *g) {
Node *p = g->r;
while (p != NULL) {
Node *q = p->next; p->next = NULL;
p = q;
}
}
void Tab::DeleteNodes() {
nodes = new ArrayList();
dummyNode = NewNode(Node::eps, (Symbol*)NULL, 0);
}
Graph* Tab::StrToGraph(const char* str) {
char *subStr = coco_string_create(str, 1, coco_string_length(str)-2);
char *s = Unescape(subStr);
coco_string_delete(subStr);
if (coco_string_length(s) == 0) parser->SemErr("empty token not allowed");
Graph *g = new Graph();
g->r = dummyNode;
for (int i = 0; i < coco_string_length(s); i++) {
Node *p = NewNode(Node::chr, (int)s[i], 0);
g->r->next = p; g->r = p;
}
g->l = dummyNode->next; dummyNode->next = NULL;
coco_string_delete(s);
return g;
}
void Tab::SetContextTrans(Node *p) { // set transition code in the graph rooted at p
while (p != NULL) {
if (p->typ == Node::chr || p->typ == Node::clas) {
p->code = Node::contextTrans;
} else if (p->typ == Node::opt || p->typ == Node::iter) {
SetContextTrans(p->sub);
} else if (p->typ == Node::alt) {
SetContextTrans(p->sub); SetContextTrans(p->down);
}
if (p->up) break;
p = p->next;
}
}
//------------ graph deletability check -----------------
bool Tab::DelGraph(Node* p) {
return p == NULL || (DelNode(p) && DelGraph(p->next));
}
bool Tab::DelSubGraph(Node* p) {
return p == NULL || (DelNode(p) && (p->up || DelSubGraph(p->next)));
}
bool Tab::DelNode(Node* p) {
if (p->typ == Node::nt) {
return p->sym->deletable;
}
else if (p->typ == Node::alt) {
return DelSubGraph(p->sub) || (p->down != NULL && DelSubGraph(p->down));
}
else {
return p->typ == Node::iter || p->typ == Node::opt || p->typ == Node::sem
|| p->typ == Node::eps || p->typ == Node::rslv || p->typ == Node::sync;
}
}
//----------------- graph printing ----------------------
int Tab::Ptr(Node *p, bool up) {
if (p == NULL) return 0;
else if (up) return -(p->n);
else return p->n;
}
char* Tab::Pos(Position *pos) {
char* format = new char[10];
if (pos == NULL) {
coco_sprintf(format, 10, " ");
} else {
coco_sprintf(format, 10, "%5d", pos->beg);
}
return format;
}
char* Tab::Name(const char *name) {
char *name2 = coco_string_create_append(name, " ");
char *subName2 = coco_string_create(name2, 0, 12);
coco_string_delete(name2);
return subName2;
// found no simpler way to get the first 12 characters of the name
// padded with blanks on the right
}
void Tab::PrintNodes() {
fprintf(trace, "Graph nodes:\n");
fprintf(trace, "----------------------------------------------------\n");
fprintf(trace, " n type name next down sub pos line\n");
fprintf(trace, " val code\n");
fprintf(trace, "----------------------------------------------------\n");
Node *p;
for (int i=0; i<nodes->Count; i++) {
p = (Node*)((*nodes)[i]);
fprintf(trace, "%4d %s ", p->n, (nTyp[p->typ]));
if (p->sym != NULL) {
char *paddedName = Name(p->sym->name);
fprintf(trace, "%12s ", paddedName);
coco_string_delete(paddedName);
} else if (p->typ == Node::clas) {
CharClass *c = (CharClass*)(*classes)[p->val];
char *paddedName = Name(c->name);
fprintf(trace, "%12s ", paddedName);
coco_string_delete(paddedName);
} else fprintf(trace, " ");
fprintf(trace, "%5d ", Ptr(p->next, p->up));
if (p->typ == Node::t || p->typ == Node::nt || p->typ == Node::wt) {
fprintf(trace, " %5s", Pos(p->pos));
} if (p->typ == Node::chr) {
fprintf(trace, "%5d %5d ", p->val, p->code);
} if (p->typ == Node::clas) {
fprintf(trace, " %5d ", p->code);
} if (p->typ == Node::alt || p->typ == Node::iter || p->typ == Node::opt) {
fprintf(trace, "%5d %5d ", Ptr(p->down, false), Ptr(p->sub, false));
} if (p->typ == Node::sem) {
fprintf(trace, " %5s", Pos(p->pos));
} if (p->typ == Node::eps || p->typ == Node::any || p->typ == Node::sync) {
fprintf(trace, " ");
}
fprintf(trace, "%5d\n", p->line);
}
fprintf(trace, "\n");
}
//---------------------------------------------------------------------
// Character class management
//---------------------------------------------------------------------
CharClass* Tab::NewCharClass(const char* name, CharSet *s) {
CharClass *c;
if (coco_string_equal(name, "#")) {
char* temp = coco_string_create_append(name, (char) dummyName++);
c = new CharClass(temp, s);
coco_string_delete(temp);
} else {
c = new CharClass(name, s);
}
c->n = classes->Count;
classes->Add(c);
return c;
}
CharClass* Tab::FindCharClass(const char* name) {
CharClass *c;
for (int i=0; i<classes->Count; i++) {
c = (CharClass*)((*classes)[i]);
if (coco_string_equal(c->name, name)) return c;
}
return NULL;
}
CharClass* Tab::FindCharClass(CharSet *s) {
CharClass *c;
for (int i=0; i<classes->Count; i++) {
c = (CharClass*)((*classes)[i]);
if (s->Equals(c->set)) return c;
}
return NULL;
}
CharSet* Tab::CharClassSet(int i) {
return ((CharClass*)((*classes)[i]))->set;
}
//----------- character class printing
char* Tab::Ch(int ch) {
char* format = new char[10];
if (ch < ' ' || ch >= 127 || ch == '\'' || ch == '\\') {
coco_sprintf(format, 10, "%d", ch);
return format;
} else {
coco_sprintf(format, 10, "'%c'", ch);
return format;
}
}
void Tab::WriteCharSet(CharSet *s) {
for (CharSet::Range *r = s->head; r != NULL; r = r->next) {
if (r->from < r->to) {
char *from = Ch(r->from);
char *to = Ch(r->to);
fprintf(trace, "%s .. %s ", from, to);
delete [] from;
delete [] to;
}
else {
char *from = Ch(r->from);
fprintf(trace, "%s ", from);
delete [] from;
}
}
}
void Tab::WriteCharClasses () {
CharClass *c;
for (int i=0; i<classes->Count; i++) {
c = (CharClass*)((*classes)[i]);
char* format2 = coco_string_create_append(c->name, " ");
char* format = coco_string_create(format2, 0, 10);
coco_string_merge(format, ": ");
fprintf(trace, format);
WriteCharSet(c->set);
fprintf(trace, "\n");
coco_string_delete(format);
coco_string_delete(format2);
}
fprintf(trace, "\n");
}
//---------------------------------------------------------------------
// Symbol set computations
//---------------------------------------------------------------------
/* Computes the first set for the given Node. */
BitArray* Tab::First0(Node *p, BitArray *mark) {
BitArray *fs = new BitArray(terminals->Count);
while (p != NULL && !((*mark)[p->n])) {
mark->Set(p->n, true);
if (p->typ == Node::nt) {
if (p->sym->firstReady) {
fs->Or(p->sym->first);
} else {
BitArray *fs0 = First0(p->sym->graph, mark);
fs->Or(fs0);
delete fs0;
}
}
else if (p->typ == Node::t || p->typ == Node::wt) {
fs->Set(p->sym->n, true);
}
else if (p->typ == Node::any) {
fs->Or(p->set);
}
else if (p->typ == Node::alt) {
BitArray *fs0 = First0(p->sub, mark);
fs->Or(fs0);
delete fs0;
fs0 = First0(p->down, mark);
fs->Or(fs0);
delete fs0;
}
else if (p->typ == Node::iter || p->typ == Node::opt) {
BitArray *fs0 = First0(p->sub, mark);
fs->Or(fs0);
delete fs0;
}
if (!DelNode(p)) break;
p = p->next;
}
return fs;
}
BitArray* Tab::First(Node *p) {
BitArray *mark = new BitArray(nodes->Count);
BitArray *fs = First0(p, mark);
delete mark;
if (ddt[3]) {
fprintf(trace, "\n");
if (p != NULL) fprintf(trace, "First: node = %d\n", p->n );
else fprintf(trace, "First: node = null\n");
PrintSet(fs, 0);
}
return fs;
}
void Tab::CompFirstSets() {
Symbol *sym;
int i;
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
sym->first = new BitArray(terminals->Count);
sym->firstReady = false;
}
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
sym->first = First(sym->graph);
sym->firstReady = true;
}
}
void Tab::CompFollow(Node *p) {
while (p != NULL && !((*visited)[p->n])) {
visited->Set(p->n, true);
if (p->typ == Node::nt) {
BitArray *s = First(p->next);
p->sym->follow->Or(s);
if (DelGraph(p->next))
p->sym->nts->Set(curSy->n, true);
} else if (p->typ == Node::opt || p->typ == Node::iter) {
CompFollow(p->sub);
} else if (p->typ == Node::alt) {
CompFollow(p->sub); CompFollow(p->down);
}
p = p->next;
}
}
void Tab::Complete(Symbol *sym) {
if (!((*visited)[sym->n])) {
visited->Set(sym->n, true);
Symbol *s;
for (int i=0; i<nonterminals->Count; i++) {
s = (Symbol*)((*nonterminals)[i]);
if ((*(sym->nts))[s->n]) {
Complete(s);
sym->follow->Or(s->follow);
if (sym == curSy) sym->nts->Set(s->n, false);
}
}
}
}
void Tab::CompFollowSets() {
Symbol *sym;
int i;
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
sym->follow = new BitArray(terminals->Count);
sym->nts = new BitArray(nonterminals->Count);
}
gramSy->follow->Set(eofSy->n, true);
visited = new BitArray(nodes->Count);
for (i=0; i<nonterminals->Count; i++) { // get direct successors of nonterminals
sym = (Symbol*)((*nonterminals)[i]);
curSy = sym;
CompFollow(sym->graph);
}
for (i=0; i<nonterminals->Count; i++) { // add indirect successors to followers
sym = (Symbol*)((*nonterminals)[i]);
visited = new BitArray(nonterminals->Count);
curSy = sym;
Complete(sym);
}
}
Node* Tab::LeadingAny(Node *p) {
if (p == NULL) return NULL;
Node *a = NULL;
if (p->typ == Node::any) a = p;
else if (p->typ == Node::alt) {
a = LeadingAny(p->sub);
if (a == NULL) a = LeadingAny(p->down);
}
else if (p->typ == Node::opt || p->typ == Node::iter) a = LeadingAny(p->sub);
if (a == NULL && DelNode(p) && !p->up) a = LeadingAny(p->next);
return a;
}
void Tab::FindAS(Node *p) { // find ANY sets
Node *a;
while (p != NULL) {
if (p->typ == Node::opt || p->typ == Node::iter) {
FindAS(p->sub);
a = LeadingAny(p->sub);
if (a != NULL) Sets::Subtract(a->set, First(p->next));
} else if (p->typ == Node::alt) {
BitArray *s1 = new BitArray(terminals->Count);
Node *q = p;
while (q != NULL) {
FindAS(q->sub);
a = LeadingAny(q->sub);
if (a != NULL) {
BitArray *tmp = First(q->down);
tmp->Or(s1);
Sets::Subtract(a->set, tmp);
} else {
BitArray *f = First(q->sub);
s1->Or(f);
delete f;
}
q = q->down;
}
}
// Remove alternative terminals before ANY, in the following
// examples a and b must be removed from the ANY set:
// [a] ANY, or {a|b} ANY, or [a][b] ANY, or (a|) ANY, or
// A = [a]. A ANY
if (DelNode(p)) {
a = LeadingAny(p->next);
if (a != NULL) {
Node *q = (p->typ == Node::nt) ? p->sym->graph : p->sub;
Sets::Subtract(a->set, First(q));
}
}
if (p->up) break;
p = p->next;
}
}
void Tab::CompAnySets() {
Symbol *sym;
for (int i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
FindAS(sym->graph);
}
}
BitArray* Tab::Expected(Node *p, Symbol *curSy) {
BitArray *s = First(p);
if (DelGraph(p))
s->Or(curSy->follow);
return s;
}
// does not look behind resolvers; only called during LL(1) test and in CheckRes
BitArray* Tab::Expected0(Node *p, Symbol *curSy) {
if (p->typ == Node::rslv) return new BitArray(terminals->Count);
else return Expected(p, curSy);
}
void Tab::CompSync(Node *p) {
while (p != NULL && !(visited->Get(p->n))) {
visited->Set(p->n, true);
if (p->typ == Node::sync) {
BitArray *s = Expected(p->next, curSy);
s->Set(eofSy->n, true);
allSyncSets->Or(s);
p->set = s;
} else if (p->typ == Node::alt) {
CompSync(p->sub); CompSync(p->down);
} else if (p->typ == Node::opt || p->typ == Node::iter)
CompSync(p->sub);
p = p->next;
}
}
void Tab::CompSyncSets() {
allSyncSets = new BitArray(terminals->Count);
allSyncSets->Set(eofSy->n, true);
visited = new BitArray(nodes->Count);
Symbol *sym;
for (int i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
curSy = sym;
CompSync(curSy->graph);
}
}
void Tab::SetupAnys() {
Node *p;
for (int i=0; i<nodes->Count; i++) {
p = (Node*)((*nodes)[i]);
if (p->typ == Node::any) {
p->set = new BitArray(terminals->Count, true);
p->set->Set(eofSy->n, false);
}
}
}
void Tab::CompDeletableSymbols() {
bool changed;
Symbol *sym;
int i;
do {
changed = false;
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
if (!sym->deletable && sym->graph != NULL && DelGraph(sym->graph)) {
sym->deletable = true; changed = true;
}
}
} while (changed);
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
if (sym->deletable)
printf(" %s deletable\n", sym->name);
}
}
void Tab::RenumberPragmas() {
int n = terminals->Count;
Symbol *sym;
for (int i=0; i<pragmas->Count; i++) {
sym = (Symbol*)((*pragmas)[i]);
sym->n = n++;
}
}
void Tab::CompSymbolSets() {
CompDeletableSymbols();
CompFirstSets();
CompAnySets();
CompFollowSets();
CompSyncSets();
if (ddt[1]) {
fprintf(trace, "\n");
fprintf(trace, "First & follow symbols:\n");
fprintf(trace, "----------------------\n\n");
Symbol *sym;
for (int i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
fprintf(trace, "%s\n", sym->name);
fprintf(trace, "first: "); PrintSet(sym->first, 10);
fprintf(trace, "follow: "); PrintSet(sym->follow, 10);
fprintf(trace, "\n");
}
}
if (ddt[4]) {
fprintf(trace, "\n");
fprintf(trace, "ANY and SYNC sets:\n");
fprintf(trace, "-----------------\n");
Node *p;
for (int i=0; i<nodes->Count; i++) {
p = (Node*)((*nodes)[i]);
if (p->typ == Node::any || p->typ == Node::sync) {
fprintf(trace, "%4d %4s ", p->n, nTyp[p->typ]);
PrintSet(p->set, 11);
}
}
}
}
//---------------------------------------------------------------------
// String handling
//---------------------------------------------------------------------
char Tab::Hex2Char(const char* s) {
int val = 0;
int len = coco_string_length(s);
for (int i = 0; i < len; i++) {
char ch = s[i];
if ('0' <= ch && ch <= '9') val = 16 * val + (ch - '0');
else if ('a' <= ch && ch <= 'f') val = 16 * val + (10 + ch - 'a');
else if ('A' <= ch && ch <= 'F') val = 16 * val + (10 + ch - 'A');
else parser->SemErr("bad escape sequence in string or character");
}
if (val >= COCO_CHAR_MAX) {/* pdt */
parser->SemErr("bad escape sequence in string or character");
}
return (char) val;
}
char* Tab::Char2Hex(int ch) {
char* format = new char[10];
coco_sprintf(format, 10, "\\0x%04x", ch);
return format;
}
char* Tab::Unescape (const char* s) {
/* replaces escape sequences in s by their Unicode values. */
StringBuilder buf = StringBuilder();
int i = 0;
int len = coco_string_length(s);
while (i < len) {
if (s[i] == '\\') {
switch (s[i+1]) {
case '\\': buf.Append('\\'); i += 2; break;
case '\'': buf.Append('\''); i += 2; break;
case '\"': buf.Append('\"'); i += 2; break;
case 'r': buf.Append('\r'); i += 2; break;
case 'n': buf.Append('\n'); i += 2; break;
case 't': buf.Append('\t'); i += 2; break;
case '0': buf.Append('\0'); i += 2; break;
case 'a': buf.Append('\a'); i += 2; break;
case 'b': buf.Append('\b'); i += 2; break;
case 'f': buf.Append('\f'); i += 2; break;
case 'v': buf.Append('\v'); i += 2; break;
case 'u': case 'x':
if (i + 6 <= coco_string_length(s)) {
char *subS = coco_string_create(s, i+2, 4);
buf.Append(Hex2Char(subS)); i += 6;
coco_string_delete(subS);
break;
} else {
parser->SemErr("bad escape sequence in string or character");
i = coco_string_length(s); break;
}
default:
parser->SemErr("bad escape sequence in string or character");
i += 2; break;
}
} else {
buf.Append(s[i]);
i++;
}
}
return buf.ToString();
}
char* Tab::Escape (const char* s) {
StringBuilder buf = StringBuilder();
char ch;
int len = coco_string_length(s);
for (int i=0; i < len; i++) {
ch = s[i];
switch(ch) {
case '\\': buf.Append("\\\\"); break;
case '\'': buf.Append("\\'"); break;
case '\"': buf.Append("\\\""); break;
case '\t': buf.Append("\\t"); break;
case '\r': buf.Append("\\r"); break;
case '\n': buf.Append("\\n"); break;
default:
if ((ch < ' ') || (ch > 0x7f)) {
char* res = Char2Hex(ch);
buf.Append(res);
delete [] res;
} else
buf.Append(ch);
break;
}
}
return buf.ToString();
}
//---------------------------------------------------------------------
// Grammar checks
//---------------------------------------------------------------------
bool Tab::GrammarOk() {
bool ok = NtsComplete()
&& AllNtReached()
&& NoCircularProductions()
&& AllNtToTerm();
if (ok) { CheckResolvers(); CheckLL1(); }
return ok;
}
//--------------- check for circular productions ----------------------
void Tab::GetSingles(Node *p, ArrayList *singles) {
if (p == NULL) return; // end of graph
if (p->typ == Node::nt) {
if (p->up || DelGraph(p->next)) singles->Add(p->sym);
} else if (p->typ == Node::alt || p->typ == Node::iter || p->typ == Node::opt) {
if (p->up || DelGraph(p->next)) {
GetSingles(p->sub, singles);
if (p->typ == Node::alt) GetSingles(p->down, singles);
}
}
if (!p->up && DelNode(p)) GetSingles(p->next, singles);
}
bool Tab::NoCircularProductions() {
bool ok, changed, onLeftSide, onRightSide;
ArrayList *list = new ArrayList();
Symbol *sym;
int i;
for (i=0; i<nonterminals->Count; i++) {
sym = (Symbol*)((*nonterminals)[i]);
ArrayList *singles = new ArrayList();
GetSingles(sym->graph, singles); // get nonterminals s such that sym-->s
Symbol *s;
for (int j=0; j<singles->Count; j++) {
s = (Symbol*)((*singles)[j]);
list->Add(new CNode(sym, s));
}
}
CNode *n;
do {
changed = false;
for (i = 0; i < list->Count; i++) {
n = (CNode*)(*list)[i];
onLeftSide = false; onRightSide = false;
CNode *m;
for (int j=0; j<list->Count; j++) {
m = (CNode*)((*list)[j]);
if (n->left == m->right) onRightSide = true;
if (n->right == m->left) onLeftSide = true;
}
if (!onLeftSide || !onRightSide) {
list->Remove(n); i--; changed = true;
}
}
} while(changed);
ok = true;
for (i=0; i<list->Count; i++) {
n = (CNode*)((*list)[i]);
ok = false; errors->count++;
printf(" %s --> %s", n->left->name, n->right->name);
}
return ok;
}
//--------------- check for LL(1) errors ----------------------
void Tab::LL1Error(int cond, Symbol *sym) {
printf(" LL1 warning in %s: ", curSy->name);
if (sym != NULL) printf("%s is ", sym->name);
switch (cond) {
case 1: printf("start of several alternatives\n"); break;
case 2: printf("start & successor of deletable structure\n"); break;
case 3: printf("an ANY node that matches no symbol\n"); break;
case 4: printf("contents of [...] or {...} must not be deletable\n"); break;
}
}
void Tab::CheckOverlap(BitArray *s1, BitArray *s2, int cond) {
Symbol *sym;
for (int i=0; i<terminals->Count; i++) {
sym = (Symbol*)((*terminals)[i]);
if ((*s1)[sym->n] && (*s2)[sym->n]) {
LL1Error(cond, sym);
}
}
}
void Tab::CheckAlts(Node *p) {
BitArray *s1, *s2;
while (p != NULL) {
if (p->typ == Node::alt) {
Node *q = p;
s1 = new BitArray(terminals->Count);
while (q != NULL) { // for all alternatives
s2 = Expected0(q->sub, curSy);
CheckOverlap(s1, s2, 1);
s1->Or(s2);
CheckAlts(q->sub);
q = q->down;
}
} else if (p->typ == Node::opt || p->typ == Node::iter) {
if (DelSubGraph(p->sub)) LL1Error(4, NULL); // e.g. [[...]]
else {
s1 = Expected0(p->sub, curSy);
s2 = Expected(p->next, curSy);
CheckOverlap(s1, s2, 2);
}
CheckAlts(p->sub);
} else if (p->typ == Node::any) {
if (Sets::Elements(p->set) == 0) LL1Error(3, NULL);
// e.g. {ANY} ANY or [ANY] ANY or ( ANY | ANY )
}
if (p->up) break;
p = p->next;
}
}