// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#include "splib.h"
#include "Parser.h"
#include "ParserMessages.h"
#include "MessageArg.h"
#include "TokenMessageArg.h"
#include "ModeInfo.h"
#include "Partition.h"
#include "SrInfo.h"
#include "Vector.h"
#include "ISetIter.h"
#include "token.h"
#include "TrieBuilder.h"
#include "macros.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
enum {
modeUsedInSd = 01,
modeUsedInProlog = 02,
modeUsedInInstance = 04,
modeUsesSr = 010
};
static struct {
Mode mode;
unsigned flags;
} modeTable[] = {
{ grpMode, modeUsedInProlog|modeUsedInInstance },
{ alitMode, modeUsedInProlog|modeUsedInInstance },
{ alitaMode, modeUsedInProlog|modeUsedInInstance },
{ aliteMode, modeUsedInProlog|modeUsedInInstance },
{ talitMode, modeUsedInProlog|modeUsedInInstance },
{ talitaMode, modeUsedInProlog|modeUsedInInstance },
{ taliteMode, modeUsedInProlog|modeUsedInInstance },
{ mdMode, modeUsedInProlog|modeUsedInInstance },
{ mdMinusMode, modeUsedInProlog },
{ mdPeroMode, modeUsedInProlog },
{ sdMode, modeUsedInSd },
{ comMode, modeUsedInProlog|modeUsedInInstance },
{ sdcomMode, modeUsedInSd },
{ piMode, modeUsedInProlog|modeUsedInInstance },
{ refMode, modeUsedInProlog|modeUsedInInstance|modeUsedInSd },
{ imsMode, modeUsedInProlog|modeUsedInInstance },
{ cmsMode, modeUsedInProlog|modeUsedInInstance },
{ rcmsMode, modeUsedInProlog|modeUsedInInstance },
{ proMode, modeUsedInProlog },
{ dsMode, modeUsedInProlog },
{ dsiMode, modeUsedInProlog },
{ plitMode, modeUsedInProlog },
{ plitaMode, modeUsedInProlog },
{ pliteMode, modeUsedInProlog },
{ sdplitMode, modeUsedInSd },
{ sdplitaMode, modeUsedInSd },
{ grpsufMode, modeUsedInProlog },
{ mlitMode, modeUsedInProlog|modeUsedInSd },
{ mlitaMode, modeUsedInProlog|modeUsedInSd },
{ asMode, modeUsedInProlog },
{ piPasMode, modeUsedInProlog },
{ slitMode, modeUsedInProlog },
{ slitaMode, modeUsedInProlog },
{ sdslitMode, modeUsedInSd },
{ sdslitaMode, modeUsedInSd },
{ cconMode, modeUsedInInstance },
{ rcconMode, modeUsedInInstance },
{ cconnetMode, modeUsedInInstance },
{ rcconnetMode, modeUsedInInstance },
{ rcconeMode, modeUsedInInstance },
{ tagMode, modeUsedInInstance },
{ econMode, modeUsedInInstance|modeUsesSr },
{ mconMode, modeUsedInInstance|modeUsesSr },
{ econnetMode, modeUsedInInstance|modeUsesSr },
{ mconnetMode, modeUsedInInstance|modeUsesSr },
};
void Parser::compileSdModes()
{
Mode modes[nModes];
int n = 0;
for (size_t i = 0; i < SIZEOF(modeTable); i++)
if (modeTable[i].flags & modeUsedInSd)
modes[n++] = modeTable[i].mode;
compileModes(modes, n, 0);
}
void Parser::compilePrologModes()
{
Boolean scopeInstance = sd().scopeInstance();
Boolean haveSr = syntax().hasShortrefs();
Mode modes[nModes];
int n = 0;
for (size_t i = 0; i < SIZEOF(modeTable); i++) {
if (scopeInstance) {
if (modeTable[i].flags & modeUsedInProlog)
modes[n++] = modeTable[i].mode;
}
else if (haveSr) {
if ((modeTable[i].flags & (modeUsedInInstance|modeUsedInProlog))
&& !(modeTable[i].flags & modeUsesSr))
modes[n++] = modeTable[i].mode;
}
else {
if (modeTable[i].flags & (modeUsedInInstance|modeUsedInProlog))
modes[n++] = modeTable[i].mode;
}
}
compileModes(modes, n, 0);
}
void Parser::compileInstanceModes()
{
Boolean scopeInstance = sd().scopeInstance();
compileNormalMap();
if (!scopeInstance && !syntax().hasShortrefs())
return;
Mode modes[nModes];
int n = 0;
for (size_t i = 0; i < SIZEOF(modeTable); i++) {
if (scopeInstance) {
if (modeTable[i].flags & modeUsedInInstance)
modes[n++] = modeTable[i].mode;
}
else {
if (modeTable[i].flags & modeUsesSr)
modes[n++] = modeTable[i].mode;
}
}
compileModes(modes, n, ¤tDtd());
}
void Parser::compileModes(const Mode *modes,
int n,
const Dtd *dtd)
{
PackedBoolean sets[Syntax::nSet];
PackedBoolean delims[Syntax::nDelimGeneral];
PackedBoolean functions[3];
int i;
Boolean includesShortref = 0;
for (i = 0; i < Syntax::nSet; i++)
sets[i] = 0;
for (i = 0; i < Syntax::nDelimGeneral; i++)
delims[i] = 0;
for (i = 0; i < 3; i++)
functions[i] = 0;
for (i = 0; i < n; i++) {
ModeInfo iter(modes[i], sd());
TokenInfo ti;
while (iter.nextToken(&ti)) {
switch (ti.type) {
case TokenInfo::delimType:
delims[ti.delim1] = 1;
break;
case TokenInfo::delimDelimType:
delims[ti.delim1] = 1;
delims[ti.delim2] = 1;
break;
case TokenInfo::delimSetType:
delims[ti.delim1] = 1;
// fall through
case TokenInfo::setType:
sets[ti.set] = 1;
break;
case TokenInfo::functionType:
functions[ti.function] = 1;
break;
}
}
if (!includesShortref && iter.includesShortref())
includesShortref = 1;
}
ISet<Char> chars;
for (i = 0; i < 3; i++)
if (functions[i])
chars.add(syntax().standardFunction(i));
for (i = 0; i < Syntax::nDelimGeneral; i++)
if (delims[i]) {
const StringC &str = syntax().delimGeneral(i);
for (size_t j = 0; j < str.size(); j++)
chars.add(str[j]);
}
if (includesShortref && dtd) {
size_t n = dtd->nShortref();
for (size_t i = 0; i < n; i++) {
const StringC &delim = dtd->shortref(i);
size_t len = delim.size();
for (size_t j = 0; j < len; j++)
if (delim[j] == sd().execToInternal('B'))
sets[Syntax::blank] = 1;
else
chars.add(delim[j]);
}
}
const ISet<Char> *csets[Syntax::nSet];
int usedSets = 0;
for (i = 0; i < Syntax::nSet; i++)
if (sets[i])
csets[usedSets++] = syntax().charSet(i);
Partition partition(chars, csets, usedSets, *syntax().generalSubstTable());
String<EquivCode> setCodes[Syntax::nSet];
int nCodes = 0;
for (i = 0; i < Syntax::nSet; i++)
if (sets[i])
setCodes[i] = partition.setCodes(nCodes++);
String<EquivCode> delimCodes[Syntax::nDelimGeneral];
for (i = 0; i < Syntax::nDelimGeneral; i++)
if (delims[i]) {
StringC str = syntax().delimGeneral(i);
for (size_t j = 0; j < str.size(); j++)
delimCodes[i] += partition.charCode(str[j]);
}
String<EquivCode> functionCode[3];
for (i = 0; i < 3; i++)
if (functions[i])
functionCode[i] += partition.charCode(syntax().standardFunction(i));
Vector<SrInfo> srInfo;
int nShortref;
if (!includesShortref || !dtd)
nShortref = 0;
else {
nShortref = dtd->nShortref();
srInfo.resize(nShortref);
for (i = 0; i < nShortref; i++) {
const StringC delim = dtd->shortref(i);
SrInfo *p = &srInfo[i];
size_t j;
for (j = 0; j < delim.size(); j++) {
if (delim[j] == sd().execToInternal('B'))
break;
p->chars += partition.charCode(delim[j]);
}
if (j < delim.size()) {
p->bSequenceLength = 1;
for (++j; j < delim.size(); j++) {
if (delim[j] != sd().execToInternal('B'))
break;
p->bSequenceLength += 1;
}
for (; j < delim.size(); j++)
p->chars2 += partition.charCode(delim[j]);
}
else
p->bSequenceLength = 0;
}
}
String<EquivCode> dataDelimCodes;
if (options().warnDataDelim) {
ModeInfo iter(mconMode, sd());
TokenInfo ti;
while (iter.nextToken(&ti)) {
switch (ti.type) {
case TokenInfo::delimType:
case TokenInfo::delimDelimType:
case TokenInfo::delimSetType:
{
if (ti.token == tokenMscMdc)
break;
const StringC &delim = syntax().delimGeneral(ti.delim1);
if (!delim.size())
break;
EquivCode c = partition.charCode(delim[0]);
for (size_t i = 0; ; i++) {
if (i >= dataDelimCodes.size()) {
dataDelimCodes += c;
break;
}
if (dataDelimCodes[i] == c)
break;
}
}
break;
default:
break;
}
}
}
const String<EquivCode> emptyString;
Boolean multicode = syntax().multicode();
for (i = 0; i < n; i++) {
TrieBuilder tb(partition.maxCode() + 1);
TrieBuilder::TokenVector ambiguities;
Vector<Token> suppressTokens;
if (multicode) {
suppressTokens.assign(partition.maxCode() + 1, 0);
suppressTokens[partition.eECode()] = tokenEe;
}
tb.recognizeEE(partition.eECode(), tokenEe);
ModeInfo iter(modes[i], sd());
TokenInfo ti;
// We try to handle the possibility that some delimiters may be empty;
// this might happen when compiling recognizers for the SGML declaration.
while (iter.nextToken(&ti)) {
switch (ti.type) {
case TokenInfo::delimType:
if (delimCodes[ti.delim1].size() > 0)
tb.recognize(delimCodes[ti.delim1], ti.token,
ti.priority, ambiguities);
break;
case TokenInfo::delimDelimType:
{
String<EquivCode> str(delimCodes[ti.delim1]);
if (str.size() > 0 && delimCodes[ti.delim2].size() > 0) {
str += delimCodes[ti.delim2];
tb.recognize(str, ti.token, ti.priority, ambiguities);
}
}
break;
case TokenInfo::delimSetType:
if (delimCodes[ti.delim1].size() > 0)
tb.recognize(delimCodes[ti.delim1], setCodes[ti.set],
ti.token, ti.priority, ambiguities);
break;
case TokenInfo::setType:
tb.recognize(emptyString, setCodes[ti.set], ti.token,
ti.priority, ambiguities);
if (multicode) {
const String<EquivCode> &equivCodes = setCodes[ti.set];
for (size_t j = 0; j < equivCodes.size(); j++)
suppressTokens[equivCodes[j]] = ti.token;
}
break;
case TokenInfo::functionType:
tb.recognize(functionCode[ti.function], ti.token,
ti.priority, ambiguities);
if (multicode)
suppressTokens[functionCode[ti.function][0]] = ti.token;
break;
}
}
if (iter.includesShortref()) {
for (int j = 0; j < nShortref; j++) {
const SrInfo *p = &srInfo[j];
if (p->bSequenceLength > 0)
tb.recognizeB(p->chars, p->bSequenceLength,
syntax().quantity(Syntax::qBSEQLEN),
setCodes[Syntax::blank],
p->chars2, tokenFirstShortref + j,
ambiguities);
else
tb.recognize(p->chars, tokenFirstShortref + j,
Priority::delim, ambiguities);
}
}
if (options().warnDataDelim) {
switch (modes[i]) {
default:
if (!iter.includesShortref())
break;
// fall through
case alitMode:
case alitaMode:
case aliteMode:
case talitMode:
case talitaMode:
case taliteMode:
for (size_t j = 0; j < dataDelimCodes.size(); j++) {
String<EquivCode> code;
code += dataDelimCodes[j];
tb.recognize(code, tokenCharDelim, Priority::dataDelim, ambiguities);
}
break;
case plitMode:
case plitaMode:
case pliteMode:
{
String<EquivCode> code;
code += partition.charCode(syntax().delimGeneral(Syntax::dPERO)[0]);
tb.recognize(code, tokenCharDelim, Priority::dataDelim, ambiguities);
}
break;
}
}
setRecognizer(modes[i],
(multicode
? new Recognizer(tb.extractTrie(), partition.map(),
suppressTokens)
: new Recognizer(tb.extractTrie(), partition.map())));
// FIXME give more information
for (size_t j = 0; j < ambiguities.size(); j += 2)
message(ParserMessages::lexicalAmbiguity,
TokenMessageArg(ambiguities[j], modes[i], syntaxPointer(),
sdPointer()),
TokenMessageArg(ambiguities[j + 1], modes[i], syntaxPointer(),
sdPointer()));
}
}
void Parser::compileNormalMap()
{
XcharMap<PackedBoolean> map(0);
ISetIter<Char> sgmlCharIter(*syntax().charSet(Syntax::sgmlChar));
Char min, max;
while (sgmlCharIter.next(min, max))
map.setRange(min, max, 1);
ModeInfo iter(mconnetMode, sd());
TokenInfo ti;
while (iter.nextToken(&ti)) {
switch (ti.type) {
case TokenInfo::delimType:
case TokenInfo::delimDelimType:
case TokenInfo::delimSetType:
{
const StringC &delim = syntax().delimGeneral(ti.delim1);
if (!delim.size())
break;
Char c = delim[0];
map.setChar(c, 0);
StringC str(syntax().generalSubstTable()->inverse(c));
for (size_t i = 0; i < str.size(); i++)
map.setChar(str[i], 0);
}
break;
case TokenInfo::setType:
if (ti.token != tokenChar) {
ISetIter<Char> setIter(*syntax().charSet(ti.set));
Char min, max;
while (setIter.next(min, max))
map.setRange(min, max, 0);
}
break;
case TokenInfo::functionType:
if (ti.token != tokenChar)
map.setChar(syntax().standardFunction(ti.function), 0);
break;
}
}
int nShortref = currentDtd().nShortref();
for (int i = 0; i < nShortref; i++) {
Char c = currentDtd().shortref(i)[0];
if (c == sd().execToInternal('B')) {
ISetIter<Char> setIter(*syntax().charSet(Syntax::blank));
Char min, max;
while (setIter.next(min, max))
map.setRange(min, max, 0);
}
else {
map.setChar(c, 0);
StringC str(syntax().generalSubstTable()->inverse(c));
for (size_t j = 0; j < str.size(); j++)
map.setChar(str[j], 0);
}
}
setNormalMap(map);
}
void Parser::addNeededShortrefs(Dtd &dtd, const Syntax &syntax)
{
if (!syntax.hasShortrefs())
return;
PackedBoolean delimRelevant[Syntax::nDelimGeneral];
size_t i;
for (i = 0; i < Syntax::nDelimGeneral; i++)
delimRelevant[i] = 0;
ModeInfo iter(mconnetMode, sd());
TokenInfo ti;
while (iter.nextToken(&ti)) {
switch (ti.type) {
case TokenInfo::delimType:
case TokenInfo::delimDelimType:
case TokenInfo::delimSetType:
delimRelevant[ti.delim1] = 1;
break;
default:
break;
}
}
// PIO and NET are the only delimiters that are recognized in con
// mode without context. If a short reference delimiter is
// identical to one of these delimiters, then we'll have an
// ambiguity. We make such a short reference delimiter needed
// to ensure that this ambiguity is reported.
if (syntax.isValidShortref(syntax.delimGeneral(Syntax::dPIO)))
dtd.addNeededShortref(syntax.delimGeneral(Syntax::dPIO));
if (syntax.isValidShortref(syntax.delimGeneral(Syntax::dNET)))
dtd.addNeededShortref(syntax.delimGeneral(Syntax::dNET));
size_t nShortrefComplex = syntax.nDelimShortrefComplex();
// A short reference delimiter is needed if it is used or if it can
// contains some other shorter delimiter that is either a relevant general
// delimiter or a shortref delimiter that is used.
for (i = 0; i < nShortrefComplex; i++) {
size_t j;
for (j = 0; j < Syntax::nDelimGeneral; j++)
if (delimRelevant[j]
&& shortrefCanPreemptDelim(syntax.delimShortrefComplex(i),
syntax.delimGeneral(j),
0,
syntax)) {
dtd.addNeededShortref(syntax.delimShortrefComplex(i));
break;
}
for (j = 0; j < dtd.nShortref(); j++)
if (shortrefCanPreemptDelim(syntax.delimShortrefComplex(i),
dtd.shortref(j),
1,
syntax)) {
dtd.addNeededShortref(syntax.delimShortrefComplex(i));
break;
}
}
}
Boolean Parser::shortrefCanPreemptDelim(const StringC &sr,
const StringC &d,
Boolean dIsSr,
const Syntax &syntax)
{
Char letterB = sd().execToInternal('B');
for (size_t i = 0; i < sr.size(); i++) {
size_t j = 0;
size_t k = i;
for (;;) {
if (j == d.size())
return 1;
if (k >= sr.size())
break;
if (sr[k] == letterB) {
if (dIsSr && d[j] == letterB) {
j++;
k++;
}
else if (syntax.isB(d[j])) {
j++;
k++;
if (k == sr.size() || sr[k] != letterB) {
// it was the last B in the sequence
while (j < d.size() && syntax.isB(d[j]))
j++;
}
}
else
break;
}
else if (dIsSr && d[j] == letterB) {
if (syntax.isB(sr[k])) {
++j;
++k;
if (j < d.size() && d[j] != letterB) {
while (k < sr.size() && syntax.isB(sr[k]))
k++;
}
}
else
break;
}
else if (d[j] == sr[k]) {
j++;
k++;
}
else
break;
}
}
return 0;
}
#ifdef SP_NAMESPACE
}
#endif