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DFA.cpp
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DFA.cpp
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/*-------------------------------------------------------------------------
DFA -- Generation of the Scanner Automaton
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 <stdlib.h>
#include "DFA.h"
#include "Tab.h"
#include "Parser.h"
#include "BitArray.h"
#include "Scanner.h"
#include "Generator.h"
namespace Coco {
//---------- Output primitives
char* DFA::Ch(int ch) {
char* format = new char[10];
if (ch < ' ' || ch >= 127 || ch == '\'' || ch == '\\')
coco_sprintf(format, 10, "%d\0", (int) ch);
else
coco_sprintf(format, 10, "'%c'\0", (int) ch);
return format;
}
char* DFA::ChCond(int ch) {
char* format = new char[20];
char* res = Ch(ch);
coco_sprintf(format, 20, "ch == %s\0", res);
delete [] res;
return format;
}
void DFA::PutRange(CharSet *s) {
for (CharSet::Range *r = s->head; r != NULL; r = r->next) {
if (r->from == r->to) {
char *from = Ch(r->from);
fprintf(gen, "ch == %s", from);
delete [] from;
} else if (r->from == 0) {
char *to = Ch(r->to);
fprintf(gen, "ch <= %s", to);
delete [] to;
} else {
char *from = Ch(r->from);
char *to = Ch(r->to);
fprintf(gen, "(ch >= %s && ch <= %s)", from, to);
delete [] from; delete [] to;
}
if (r->next != NULL) fprintf(gen, " || ");
}
}
//---------- State handling
State* DFA::NewState() {
State *s = new State(); s->nr = ++lastStateNr;
if (firstState == NULL) firstState = s; else lastState->next = s;
lastState = s;
return s;
}
void DFA::NewTransition(State *from, State *to, int typ, int sym, int tc) {
Target *t = new Target(to);
Action *a = new Action(typ, sym, tc); a->target = t;
from->AddAction(a);
if (typ == Node::clas) curSy->tokenKind = Symbol::classToken;
}
void DFA::CombineShifts() {
State *state;
Action *a, *b, *c;
CharSet *seta, *setb;
for (state = firstState; state != NULL; state = state->next) {
for (a = state->firstAction; a != NULL; a = a->next) {
b = a->next;
while (b != NULL)
if (a->target->state == b->target->state && a->tc == b->tc) {
seta = a->Symbols(tab); setb = b->Symbols(tab);
seta->Or(setb);
a->ShiftWith(seta, tab);
c = b; b = b->next; state->DetachAction(c);
} else b = b->next;
}
}
}
void DFA::FindUsedStates(State *state, BitArray *used) {
if ((*used)[state->nr]) return;
used->Set(state->nr, true);
for (Action *a = state->firstAction; a != NULL; a = a->next)
FindUsedStates(a->target->state, used);
}
void DFA::DeleteRedundantStates() {
//State *newState = new State[State::lastNr + 1];
State **newState = (State**) malloc (sizeof(State*) * (lastStateNr + 1));
BitArray *used = new BitArray(lastStateNr + 1);
FindUsedStates(firstState, used);
// combine equal final states
for (State *s1 = firstState->next; s1 != NULL; s1 = s1->next) // firstState cannot be final
if ((*used)[s1->nr] && s1->endOf != NULL && s1->firstAction == NULL && !(s1->ctx))
for (State *s2 = s1->next; s2 != NULL; s2 = s2->next)
if ((*used)[s2->nr] && s1->endOf == s2->endOf && s2->firstAction == NULL && !(s2->ctx)) {
used->Set(s2->nr, false); newState[s2->nr] = s1;
}
State *state;
for (state = firstState; state != NULL; state = state->next)
if ((*used)[state->nr])
for (Action *a = state->firstAction; a != NULL; a = a->next)
if (!((*used)[a->target->state->nr]))
a->target->state = newState[a->target->state->nr];
// delete unused states
lastState = firstState; lastStateNr = 0; // firstState has number 0
for (state = firstState->next; state != NULL; state = state->next)
if ((*used)[state->nr]) {state->nr = ++lastStateNr; lastState = state;}
else lastState->next = state->next;
free (newState);
delete used;
}
State* DFA::TheState(Node *p) {
State *state;
if (p == NULL) {state = NewState(); state->endOf = curSy; return state;}
else return p->state;
}
void DFA::Step(State *from, Node *p, BitArray *stepped) {
if (p == NULL) return;
stepped->Set(p->n, true);
if (p->typ == Node::clas || p->typ == Node::chr) {
NewTransition(from, TheState(p->next), p->typ, p->val, p->code);
} else if (p->typ == Node::alt) {
Step(from, p->sub, stepped); Step(from, p->down, stepped);
} else if (p->typ == Node::iter) {
if (tab->DelSubGraph(p->sub)) {
parser->SemErr("contents of {...} must not be deletable");
return;
}
if (p->next != NULL && !((*stepped)[p->next->n])) Step(from, p->next, stepped);
Step(from, p->sub, stepped);
if (p->state != from) {
BitArray *newStepped = new BitArray(tab->nodes->Count);
Step(p->state, p, newStepped);
delete newStepped;
}
} else if (p->typ == Node::opt) {
if (p->next != NULL && !((*stepped)[p->next->n])) Step(from, p->next, stepped);
Step(from, p->sub, stepped);
}
}
// Assigns a state n.state to every node n. There will be a transition from
// n.state to n.next.state triggered by n.val. All nodes in an alternative
// chain are represented by the same state.
// Numbering scheme:
// - any node after a chr, clas, opt, or alt, must get a new number
// - if a nested structure starts with an iteration the iter node must get a new number
// - if an iteration follows an iteration, it must get a new number
void DFA::NumberNodes(Node *p, State *state, bool renumIter) {
if (p == NULL) return;
if (p->state != NULL) return; // already visited;
if ((state == NULL) || ((p->typ == Node::iter) && renumIter)) state = NewState();
p->state = state;
if (tab->DelGraph(p)) state->endOf = curSy;
if (p->typ == Node::clas || p->typ == Node::chr) {
NumberNodes(p->next, NULL, false);
} else if (p->typ == Node::opt) {
NumberNodes(p->next, NULL, false);
NumberNodes(p->sub, state, true);
} else if (p->typ == Node::iter) {
NumberNodes(p->next, state, true);
NumberNodes(p->sub, state, true);
} else if (p->typ == Node::alt) {
NumberNodes(p->next, NULL, false);
NumberNodes(p->sub, state, true);
NumberNodes(p->down, state, renumIter);
}
}
void DFA::FindTrans (Node *p, bool start, BitArray *marked) {
if (p == NULL || (*marked)[p->n]) return;
marked->Set(p->n, true);
if (start) {
BitArray *stepped = new BitArray(tab->nodes->Count);
Step(p->state, p, stepped); // start of group of equally numbered nodes
delete stepped;
}
if (p->typ == Node::clas || p->typ == Node::chr) {
FindTrans(p->next, true, marked);
} else if (p->typ == Node::opt) {
FindTrans(p->next, true, marked); FindTrans(p->sub, false, marked);
} else if (p->typ == Node::iter) {
FindTrans(p->next, false, marked); FindTrans(p->sub, false, marked);
} else if (p->typ == Node::alt) {
FindTrans(p->sub, false, marked); FindTrans(p->down, false, marked);
}
}
void DFA::ConvertToStates(Node *p, Symbol *sym) {
curGraph = p; curSy = sym;
if (tab->DelGraph(curGraph)) {
parser->SemErr("token might be empty");
return;
}
NumberNodes(curGraph, firstState, true);
FindTrans(curGraph, true, new BitArray(tab->nodes->Count));
if (p->typ == Node::iter) {
BitArray *stepped = new BitArray(tab->nodes->Count);
Step(firstState, p, stepped);
delete stepped;
}
}
// match string against current automaton; store it either as a fixedToken or as a litToken
void DFA::MatchLiteral(char* s, Symbol *sym) {
char *subS = coco_string_create(s, 1, coco_string_length(s)-2);
s = tab->Unescape(subS);
coco_string_delete(subS);
int i, len = coco_string_length(s);
State *state = firstState;
Action *a = NULL;
for (i = 0; i < len; i++) { // try to match s against existing DFA
a = FindAction(state, s[i]);
if (a == NULL) break;
state = a->target->state;
}
// if s was not totally consumed or leads to a non-final state => make new DFA from it
if (i != len || state->endOf == NULL) {
state = firstState; i = 0; a = NULL;
dirtyDFA = true;
}
for (; i < len; i++) { // make new DFA for s[i..len-1]
State *to = NewState();
NewTransition(state, to, Node::chr, s[i], Node::normalTrans);
state = to;
}
coco_string_delete(s);
Symbol *matchedSym = state->endOf;
if (state->endOf == NULL) {
state->endOf = sym;
} else if (matchedSym->tokenKind == Symbol::fixedToken || (a != NULL && a->tc == Node::contextTrans)) {
// s matched a token with a fixed definition or a token with an appendix that will be cut off
char format[200];
coco_sprintf(format, 200, "tokens %s and %s cannot be distinguished", sym->name, matchedSym->name);
parser->SemErr(format);
} else { // matchedSym == classToken || classLitToken
matchedSym->tokenKind = Symbol::classLitToken;
sym->tokenKind = Symbol::litToken;
}
}
void DFA::SplitActions(State *state, Action *a, Action *b) {
Action *c; CharSet *seta, *setb, *setc;
seta = a->Symbols(tab); setb = b->Symbols(tab);
if (seta->Equals(setb)) {
a->AddTargets(b);
state->DetachAction(b);
} else if (seta->Includes(setb)) {
setc = seta->Clone(); setc->Subtract(setb);
b->AddTargets(a);
a->ShiftWith(setc, tab);
} else if (setb->Includes(seta)) {
setc = setb->Clone(); setc->Subtract(seta);
a->AddTargets(b);
b->ShiftWith(setc, tab);
} else {
setc = seta->Clone(); setc->And(setb);
seta->Subtract(setc);
setb->Subtract(setc);
a->ShiftWith(seta, tab);
b->ShiftWith(setb, tab);
c = new Action(0, 0, Node::normalTrans); // typ and sym are set in ShiftWith
c->AddTargets(a);
c->AddTargets(b);
c->ShiftWith(setc, tab);
state->AddAction(c);
}
}
bool DFA::Overlap(Action *a, Action *b) {
CharSet *seta, *setb;
if (a->typ == Node::chr)
if (b->typ == Node::chr) return (a->sym == b->sym);
else {setb = tab->CharClassSet(b->sym); return setb->Get(a->sym);}
else {
seta = tab->CharClassSet(a->sym);
if (b->typ == Node::chr) return seta->Get(b->sym);
else {setb = tab->CharClassSet(b->sym); return seta->Intersects(setb);}
}
}
bool DFA::MakeUnique(State *state) { // return true if actions were split
bool changed = false;
for (Action *a = state->firstAction; a != NULL; a = a->next)
for (Action *b = a->next; b != NULL; b = b->next)
if (Overlap(a, b)) {
SplitActions(state, a, b);
changed = true;
}
return changed;
}
void DFA::MeltStates(State *state) {
bool changed, ctx;
BitArray *targets;
Symbol *endOf;
for (Action *action = state->firstAction; action != NULL; action = action->next) {
if (action->target->next != NULL) {
GetTargetStates(action, targets, endOf, ctx);
Melted *melt = StateWithSet(targets);
if (melt == NULL) {
State *s = NewState(); s->endOf = endOf; s->ctx = ctx;
for (Target *targ = action->target; targ != NULL; targ = targ->next)
s->MeltWith(targ->state);
do {changed = MakeUnique(s);} while (changed);
melt = NewMelted(targets, s);
}
action->target->next = NULL;
action->target->state = melt->state;
}
}
}
void DFA::FindCtxStates() {
for (State *state = firstState; state != NULL; state = state->next)
for (Action *a = state->firstAction; a != NULL; a = a->next)
if (a->tc == Node::contextTrans) a->target->state->ctx = true;
}
void DFA::MakeDeterministic() {
State *state;
bool changed;
lastSimState = lastState->nr;
maxStates = 2 * lastSimState; // heuristic for set size in Melted.set
FindCtxStates();
for (state = firstState; state != NULL; state = state->next)
do {changed = MakeUnique(state);} while (changed);
for (state = firstState; state != NULL; state = state->next)
MeltStates(state);
DeleteRedundantStates();
CombineShifts();
}
void DFA::PrintStates() {
fprintf(trace, "\n");
fprintf(trace, "---------- states ----------\n");
for (State *state = firstState; state != NULL; state = state->next) {
bool first = true;
if (state->endOf == NULL) fprintf(trace, " ");
else {
char *paddedName = tab->Name(state->endOf->name);
fprintf(trace, "E(%12s)", paddedName);
coco_string_delete(paddedName);
}
fprintf(trace, "%3d:", state->nr);
if (state->firstAction == NULL) fprintf(trace, "\n");
for (Action *action = state->firstAction; action != NULL; action = action->next) {
if (first) {fprintf(trace, " "); first = false;} else fprintf(trace, " ");
if (action->typ == Node::clas) fprintf(trace, "%s", ((CharClass*)(*tab->classes)[action->sym])->name);
else fprintf(trace, "%3s", Ch(action->sym));
for (Target *targ = action->target; targ != NULL; targ = targ->next) {
fprintf(trace, "%3d", targ->state->nr);
}
if (action->tc == Node::contextTrans) fprintf(trace, " context\n"); else fprintf(trace, "\n");
}
}
fprintf(trace, "\n---------- character classes ----------\n");
tab->WriteCharClasses();
}
//---------------------------- actions --------------------------------
Action* DFA::FindAction(State *state, char ch) {
for (Action *a = state->firstAction; a != NULL; a = a->next)
if (a->typ == Node::chr && ch == a->sym) return a;
else if (a->typ == Node::clas) {
CharSet *s = tab->CharClassSet(a->sym);
if (s->Get(ch)) return a;
}
return NULL;
}
void DFA::GetTargetStates(Action *a, BitArray* &targets, Symbol* &endOf, bool &ctx) {
// compute the set of target states
targets = new BitArray(maxStates); endOf = NULL;
ctx = false;
for (Target *t = a->target; t != NULL; t = t->next) {
int stateNr = t->state->nr;
if (stateNr <= lastSimState) { targets->Set(stateNr, true); }
else { targets->Or(MeltedSet(stateNr)); }
if (t->state->endOf != NULL) {
if (endOf == NULL || endOf == t->state->endOf) {
endOf = t->state->endOf;
}
else {
printf("Tokens %s and %s cannot be distinguished\n", endOf->name, t->state->endOf->name);
errors->count++;
}
}
if (t->state->ctx) {
ctx = true;
// The following check seems to be unnecessary. It reported an error
// if a symbol + context was the prefix of another symbol, e.g.
// s1 = "a" "b" "c".
// s2 = "a" CONTEXT("b").
// But this is ok.
// if (t.state.endOf != null) {
// Console.WriteLine("Ambiguous context clause");
// Errors.count++;
// }
}
}
}
//------------------------- melted states ------------------------------
Melted* DFA::NewMelted(BitArray *set, State *state) {
Melted *m = new Melted(set, state);
m->next = firstMelted; firstMelted = m;
return m;
}
BitArray* DFA::MeltedSet(int nr) {
Melted *m = firstMelted;
while (m != NULL) {
if (m->state->nr == nr) return m->set; else m = m->next;
}
//Errors::Exception("-- compiler error in Melted::Set");
//throw new Exception("-- compiler error in Melted::Set");
return NULL;
}
Melted* DFA::StateWithSet(BitArray *s) {
for (Melted *m = firstMelted; m != NULL; m = m->next)
if (Sets::Equals(s, m->set)) return m;
return NULL;
}
//------------------------ comments --------------------------------
char* DFA::CommentStr(Node *p) {
StringBuilder s = StringBuilder();
while (p != NULL) {
if (p->typ == Node::chr) {
s.Append((char)p->val);
} else if (p->typ == Node::clas) {
CharSet *set = tab->CharClassSet(p->val);
if (set->Elements() != 1) parser->SemErr("character set contains more than 1 character");
s.Append((char) set->First());
}
else parser->SemErr("comment delimiters may not be structured");
p = p->next;
}
if (s.GetLength() == 0 || s.GetLength() > 2) {
parser->SemErr("comment delimiters must be 1 or 2 characters long");
s = StringBuilder("?");
}
return s.ToString();
}
void DFA::NewComment(Node *from, Node *to, bool nested) {
Comment *c = new Comment(CommentStr(from), CommentStr(to), nested);
c->next = firstComment; firstComment = c;
}
//------------------------ scanner generation ----------------------
void DFA::GenComBody(Comment *com) {
fprintf(gen, "\t\tfor(;;) {\n");
char* res = ChCond(com->stop[0]);
fprintf(gen, "\t\t\tif (%s) ", res);
fprintf(gen, "{\n");
delete [] res;
if (coco_string_length(com->stop) == 1) {
fprintf(gen, "\t\t\t\tlevel--;\n");
fprintf(gen, "\t\t\t\tif (level == 0) { oldEols = line - line0; NextCh(); return true; }\n");
fprintf(gen, "\t\t\t\tNextCh();\n");
} else {
fprintf(gen, "\t\t\t\tNextCh();\n");
char* res = ChCond(com->stop[1]);
fprintf(gen, "\t\t\t\tif (%s) {\n", res);
delete [] res;
fprintf(gen, "\t\t\t\t\tlevel--;\n");
fprintf(gen, "\t\t\t\t\tif (level == 0) { oldEols = line - line0; NextCh(); return true; }\n");
fprintf(gen, "\t\t\t\t\tNextCh();\n");
fprintf(gen, "\t\t\t\t}\n");
}
if (com->nested) {
fprintf(gen, "\t\t\t}");
char* res = ChCond(com->start[0]);
fprintf(gen, " else if (%s) ", res);
delete [] res;
fprintf(gen, "{\n");
if (coco_string_length(com->stop) == 1)
fprintf(gen, "\t\t\t\tlevel++; NextCh();\n");
else {
fprintf(gen, "\t\t\t\tNextCh();\n");
char* res = ChCond(com->start[1]);
fprintf(gen, "\t\t\t\tif (%s) ", res);
delete [] res;
fprintf(gen, "{\n");
fprintf(gen, "\t\t\t\t\tlevel++; NextCh();\n");
fprintf(gen, "\t\t\t\t}\n");
}
}
fprintf(gen, "\t\t\t} else if (ch == buffer->EoF) return false;\n");
fprintf(gen, "\t\t\telse NextCh();\n");
fprintf(gen, "\t\t}\n");
}
void DFA::GenCommentHeader(Comment *, int i) {
fprintf(gen, "\tbool Comment%d();\n", i);
}
void DFA::GenComment(Comment *com, int i) {
fprintf(gen, "\n");
fprintf(gen, "bool Scanner::Comment%d() ", i);
fprintf(gen, "{\n");
fprintf(gen, "\tint level = 1, pos0 = pos, line0 = line, col0 = col, charPos0 = charPos;\n");
if (coco_string_length(com->start) == 1) {
fprintf(gen, "\tNextCh();\n");
GenComBody(com);
} else {
fprintf(gen, "\tNextCh();\n");
char* res = ChCond(com->start[1]);
fprintf(gen, "\tif (%s) ", res);
delete [] res;
fprintf(gen, "{\n");
fprintf(gen, "\t\tNextCh();\n");
GenComBody(com);
fprintf(gen, "\t} else {\n");
fprintf(gen, "\t\tbuffer->SetPos(pos0); NextCh(); line = line0; col = col0; charPos = charPos0;\n");
fprintf(gen, "\t}\n");
fprintf(gen, "\treturn false;\n");
}
fprintf(gen, "}\n");
}
char* DFA::SymName(Symbol *sym) { // real name value is stored in Tab.literals
if (('a'<=sym->name[0] && sym->name[0]<='z') ||
('A'<=sym->name[0] && sym->name[0]<='Z')) { //Char::IsLetter(sym->name[0])
Iterator *iter = tab->literals->GetIterator();
while (iter->HasNext()) {
DictionaryEntry *e = iter->Next();
if (e->val == sym) { return e->key; }
}
}
return sym->name;
}
void DFA::GenLiterals () {
Symbol *sym;
ArrayList *ts[2];
ts[0] = tab->terminals;
ts[1] = tab->pragmas;
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < ts[i]->Count; j++) {
sym = (Symbol*) ((*(ts[i]))[j]);
if (sym->tokenKind == Symbol::litToken) {
char* name = coco_string_create(SymName(sym));
if (ignoreCase) {
char *oldName = name;
name = coco_string_create_lower(name);
coco_string_delete(oldName);
}
// sym.name stores literals with quotes, e.g. "\"Literal\""
fprintf(gen, "\tkeywords.set(");
// write keyword, escape non printable characters
for (int k = 0; name[k] != '\0'; k++) {
char c = name[k];
fprintf(gen, (c >= 32 && c <= 127) ? "%c" : "\\x%04x", c);
}
fprintf(gen, ", %d);\n", sym->n);
coco_string_delete(name);
}
}
}
}
int DFA::GenNamespaceOpen(const char *nsName) {
if (nsName == NULL || coco_string_length(nsName) == 0) {
return 0;
}
const int len = coco_string_length(nsName);
int startPos = 0;
int nrOfNs = 0;
do {
int curLen = coco_string_indexof(nsName + startPos, COCO_CPP_NAMESPACE_SEPARATOR);
if (curLen == -1) { curLen = len - startPos; }
char *curNs = coco_string_create(nsName, startPos, curLen);
fprintf(gen, "namespace %s {\n", curNs);
coco_string_delete(curNs);
startPos = startPos + curLen + 1;
if (startPos < len && nsName[startPos] == COCO_CPP_NAMESPACE_SEPARATOR) {
++startPos;
}
++nrOfNs;
} while (startPos < len);
return nrOfNs;
}
void DFA::GenNamespaceClose(int nrOfNs) {
for (int i = 0; i < nrOfNs; ++i) {
fprintf(gen, "} // namespace\n");
}
}
void DFA::CheckLabels() {
int i;
State *state;
Action *action;
for (i=0; i < lastStateNr+1; i++) {
existLabel[i] = false;
}
for (state = firstState->next; state != NULL; state = state->next) {
for (action = state->firstAction; action != NULL; action = action->next) {
existLabel[action->target->state->nr] = true;
}
}
}
void DFA::WriteState(State *state) {
Symbol *endOf = state->endOf;
fprintf(gen, "\t\tcase %d:\n", state->nr);
if (existLabel[state->nr])
fprintf(gen, "\t\t\tcase_%d:\n", state->nr);
if (endOf != NULL && state->firstAction != NULL) {
fprintf(gen, "\t\t\trecEnd = pos; recKind = %d;\n", endOf->n);
}
bool ctxEnd = state->ctx;
for (Action *action = state->firstAction; action != NULL; action = action->next) {
if (action == state->firstAction) fprintf(gen, "\t\t\tif (");
else fprintf(gen, "\t\t\telse if (");
if (action->typ == Node::chr) {
char* res = ChCond((char)action->sym);
fprintf(gen, "%s", res);
delete [] res;
} else PutRange(tab->CharClassSet(action->sym));
fprintf(gen, ") {");
if (action->tc == Node::contextTrans) {
fprintf(gen, "apx++; "); ctxEnd = false;
} else if (state->ctx)
fprintf(gen, "apx = 0; ");
fprintf(gen, "AddCh(); goto case_%d;", action->target->state->nr);
fprintf(gen, "}\n");
}
if (state->firstAction == NULL)
fprintf(gen, "\t\t\t{");
else
fprintf(gen, "\t\t\telse {");
if (ctxEnd) { // final context state: cut appendix
fprintf(gen, "\n");
fprintf(gen, "\t\t\t\ttlen -= apx;\n");
fprintf(gen, "\t\t\t\tSetScannerBehindT();");
fprintf(gen, "\t\t\t\tbuffer->SetPos(t->pos); NextCh(); line = t->line; col = t->col;\n");
fprintf(gen, "\t\t\t\tfor (int i = 0; i < tlen; i++) NextCh();\n");
fprintf(gen, "\t\t\t\t");
}
if (endOf == NULL) {
fprintf(gen, "goto case_0;}\n");
} else {
fprintf(gen, "t->kind = %d; ", endOf->n);
if (endOf->tokenKind == Symbol::classLitToken) {
if (ignoreCase) {
fprintf(gen, "char *literal = coco_string_create_lower(tval, 0, tlen); t->kind = keywords.get(literal, t->kind); coco_string_delete(literal); break;}\n");
} else {
fprintf(gen, "char *literal = coco_string_create(tval, 0, tlen); t->kind = keywords.get(literal, t->kind); coco_string_delete(literal); break;}\n");
}
} else {
fprintf(gen, "break;}\n");
}
}
}
void DFA::WriteStartTab() {
bool firstRange = true;
for (Action *action = firstState->firstAction; action != NULL; action = action->next) {
int targetState = action->target->state->nr;
if (action->typ == Node::chr) {
fprintf(gen, "\tstart.set(%d, %d);\n", action->sym, targetState);
} else {
CharSet *s = tab->CharClassSet(action->sym);
for (CharSet::Range *r = s->head; r != NULL; r = r->next) {
if (firstRange) {
firstRange = false;
fprintf(gen, "\tint i;\n");
}
fprintf(gen, "\tfor (i = %d; i <= %d; ++i) start.set(i, %d);\n", r->from, r->to, targetState);
}
}
}
fprintf(gen, "\t\tstart.set(Buffer::EoF, -1);\n");
}
void DFA::WriteScanner() {
Generator g = Generator(tab, errors);
fram = g.OpenFrame("Scanner.frame");
gen = g.OpenGen("Scanner.h");
if (dirtyDFA) MakeDeterministic();
// Header
g.GenCopyright();
g.SkipFramePart("-->begin");
g.CopyFramePart("-->prefix");
g.GenPrefixFromNamespace();
g.CopyFramePart("-->prefix");
g.GenPrefixFromNamespace();
g.CopyFramePart("-->namespace_open");
int nrOfNs = GenNamespaceOpen(tab->nsName);
g.CopyFramePart("-->casing0");
if (ignoreCase) {
fprintf(gen, "\twchar_t valCh; // current input character (for token.val)\n");
}
g.CopyFramePart("-->commentsheader");
Comment *com = firstComment;
int cmdIdx = 0;
while (com != NULL) {
GenCommentHeader(com, cmdIdx);
com = com->next; cmdIdx++;
}
g.CopyFramePart("-->namespace_close");
GenNamespaceClose(nrOfNs);
g.CopyFramePart("-->implementation");
fclose(gen);
// Source
gen = g.OpenGen("Scanner.cpp");
g.GenCopyright();
g.SkipFramePart("-->begin");
g.CopyFramePart("-->namespace_open");
nrOfNs = GenNamespaceOpen(tab->nsName);
g.CopyFramePart("-->declarations");
fprintf(gen, "\tmaxT = %d;\n", tab->terminals->Count - 1);
fprintf(gen, "\tnoSym = %d;\n", tab->noSym->n);
WriteStartTab();
GenLiterals();
g.CopyFramePart("-->initialization");
g.CopyFramePart("-->casing1");
if (ignoreCase) {
fprintf(gen, "\t\tvalCh = ch;\n");
fprintf(gen, "\t\tif ('A' <= ch && ch <= 'Z') ch = ch - 'A' + 'a'; // ch.ToLower()");
}
g.CopyFramePart("-->casing2");
fprintf(gen, "\t\ttval[tlen++] = (char)");
if (ignoreCase) fprintf(gen, "valCh;"); else fprintf(gen, "ch;");
g.CopyFramePart("-->comments");
com = firstComment; cmdIdx = 0;
while (com != NULL) {
GenComment(com, cmdIdx);
com = com->next; cmdIdx++;
}
g.CopyFramePart("-->scan1");
fprintf(gen, "\t\t\t");
if (tab->ignored->Elements() > 0) { PutRange(tab->ignored); } else { fprintf(gen, "false"); }
g.CopyFramePart("-->scan2");
if (firstComment != NULL) {
fprintf(gen, "\tif (");
com = firstComment; cmdIdx = 0;
while (com != NULL) {
char* res = ChCond(com->start[0]);
fprintf(gen, "(%s && Comment%d())", res, cmdIdx);
delete [] res;
if (com->next != NULL) {
fprintf(gen, " || ");
}
com = com->next; cmdIdx++;
}
fprintf(gen, ") return NextToken();");
}
if (hasCtxMoves) { fprintf(gen, "\n"); fprintf(gen, "\tint apx = 0;"); } /* pdt */
g.CopyFramePart("-->scan3");
/* CSB 02-10-05 check the Labels */
existLabel = new bool[lastStateNr+1];
CheckLabels();
for (State *state = firstState->next; state != NULL; state = state->next)
WriteState(state);
delete [] existLabel;
g.CopyFramePart("-->namespace_close");
GenNamespaceClose(nrOfNs);
g.CopyFramePart(NULL);
fclose(gen);
}
DFA::DFA(Parser *parser) {
this->parser = parser;
tab = parser->tab;
errors = parser->errors;
trace = parser->trace;
firstState = NULL; lastState = NULL; lastStateNr = -1;
firstState = NewState();
firstMelted = NULL; firstComment = NULL;
ignoreCase = false;
dirtyDFA = false;
hasCtxMoves = false;
}
}; // namespace