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//========================================================================
//
// Parser.cc
//
// Copyright 1996 Derek B. Noonburg
//
//========================================================================
#ifdef __GNUC__
#pragma implementation
#endif
#include <stddef.h>
#include "Object.h"
#include "Array.h"
#include "Dict.h"
#include "Parser.h"
#include "Error.h"
Parser::Parser(Lexer *lexer1) {
lexer = lexer1;
inlineImg = 0;
lexer->getObj(&buf1);
lexer->getObj(&buf2);
}
Parser::~Parser() {
buf1.free();
buf2.free();
delete lexer;
}
Object *Parser::getObj(Object *obj) {
char *key;
Stream *str;
Object obj2;
int num;
// refill buffer after inline image data
if (inlineImg == 2) {
buf1.free();
buf2.free();
lexer->getObj(&buf1);
lexer->getObj(&buf2);
inlineImg = 0;
}
// array
if (buf1.isCmd("[")) {
shift();
obj->initArray();
while (!buf1.isCmd("]") && !buf1.isEOF())
obj->arrayAdd(getObj(&obj2));
if (buf1.isEOF())
error(getPos(), "End of file inside array");
shift();
// dictionary or stream
} else if (buf1.isCmd("<<")) {
shift();
obj->initDict();
while (!buf1.isCmd(">>") && !buf1.isEOF()) {
if (!buf1.isName()) {
error(getPos(), "Dictionary key must be a name object");
shift();
} else {
key = copyString(buf1.getName());
shift();
if (buf1.isEOF() || buf1.isError())
break;
obj->dictAdd(key, getObj(&obj2));
}
}
if (buf1.isEOF())
error(getPos(), "End of file inside dictionary");
if (buf2.isCmd("stream")) {
if ((str = makeStream(obj))) {
obj->initStream(str);
} else {
obj->free();
obj->initError();
}
} else {
shift();
}
// indirect reference or integer
} else if (buf1.isInt()) {
num = buf1.getInt();
shift();
if (buf1.isInt() && buf2.isCmd("R")) {
obj->initRef(num, buf1.getInt());
shift();
shift();
} else {
obj->initInt(num);
}
// simple object
} else {
buf1.copy(obj);
shift();
}
return obj;
}
Stream *Parser::makeStream(Object *dict) {
Object obj;
Stream *str;
int pos, length;
// get stream start position
lexer->skipToNextLine();
pos = lexer->getPos();
// get length
dict->dictLookup("Length", &obj);
if (obj.isInt()) {
length = obj.getInt();
obj.free();
} else {
error(getPos(), "Bad 'Length' attribute in stream");
obj.free();
return NULL;
}
// make base stream
str = new FileStream(lexer->getStream()->getFile(), pos, length, dict);
// get filters
str = str->addFilters(dict);
// skip over stream data
lexer->setPos(pos + length);
// refill token buffers and check for 'endstream'
shift(); // kill '>>'
shift(); // kill 'stream'
if (buf1.isCmd("endstream"))
shift();
else
error(getPos(), "Missing 'endstream'");
return str;
}
void Parser::shift() {
if (inlineImg > 0) {
++inlineImg;
} else if (buf2.isCmd("ID")) {
lexer->skipChar(); // skip char after 'ID' command
inlineImg = 1;
}
buf1.free();
buf1 = buf2;
if (inlineImg > 0) // don't buffer inline image data
buf2.initNull();
else
lexer->getObj(&buf2);
}
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