3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
8 * Full author contact details are available in file CREDITS.
13 #include "texparser.h"
23 using std::istringstream;
31 CatCode theCatcode[256];
33 void skipSpaceTokens(istream & is, char c)
35 // skip trailing spaces
36 while (catcode(c) == catSpace || catcode(c) == catNewline)
39 //cerr << "putting back: " << c << "\n";
46 fill(theCatcode, theCatcode + 256, catOther);
47 fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
48 fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
50 theCatcode[int('\\')] = catEscape;
51 theCatcode[int('{')] = catBegin;
52 theCatcode[int('}')] = catEnd;
53 theCatcode[int('$')] = catMath;
54 theCatcode[int('&')] = catAlign;
55 theCatcode[10] = catNewline;
56 theCatcode[int('#')] = catParameter;
57 theCatcode[int('^')] = catSuper;
58 theCatcode[int('_')] = catSub;
59 theCatcode[0x7f] = catIgnore;
60 theCatcode[int(' ')] = catSpace;
61 theCatcode[int('\t')] = catSpace;
62 theCatcode[13] = catIgnore;
63 theCatcode[int('~')] = catActive;
64 theCatcode[int('%')] = catComment;
67 theCatcode[int('@')] = catLetter;
77 mode_type asMode(mode_type oldmode, string const & str)
79 if (str == "mathmode")
81 if (str == "textmode" || str == "forcetext")
87 CatCode catcode(unsigned char c)
98 ostream & operator<<(ostream & os, Token const & t)
101 os << '\\' << t.cs() << ' ';
102 else if (t.cat() == catLetter)
104 else if (t.cat() == catNewline)
105 os << "[\\n," << t.cat() << "]\n";
107 os << '[' << t.character() << ',' << t.cat() << ']';
112 string Token::asString() const
114 return cs_.size() ? cs_ : string(1, char_);
118 string Token::asInput() const
120 return char_ ? string(1, char_) : '\\' + cs_ + ' ';
129 Parser::Parser(istream & is)
130 : lineno_(0), pos_(0)
136 Parser::Parser(string const & s)
137 : lineno_(0), pos_(0)
144 void Parser::push_back(Token const & t)
146 tokens_.push_back(t);
150 void Parser::pop_back()
156 Token const & Parser::prev_token() const
158 static const Token dummy;
159 return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
163 Token const & Parser::next_token() const
165 static const Token dummy;
166 return good() ? tokens_[pos_] : dummy;
170 Token const & Parser::get_token()
172 static const Token dummy;
173 //cerr << "looking at token " << tokens_[pos_] << " pos: " << pos_ << '\n';
174 return good() ? tokens_[pos_++] : dummy;
178 void Parser::skip_spaces()
181 if (next_token().cat() == catSpace || next_token().cat() == catNewline)
183 else if (next_token().cat() == catComment)
184 while (next_token().cat() != catNewline)
192 void Parser::putback()
198 bool Parser::good() const
200 return pos_ < tokens_.size();
204 char Parser::getChar()
207 error("The input stream is not well...");
208 return tokens_[pos_++].character();
212 string Parser::getArg(char left, char right)
222 while ((c = getChar()) != right && good())
229 string Parser::getOpt()
231 string const res = getArg('[', ']');
232 return res.size() ? '[' + res + ']' : string();
236 void Parser::tokenize(istream & is)
238 static bool init_done = false;
247 //cerr << "reading c: " << c << "\n";
249 switch (catcode(c)) {
253 if (catcode(c) == catNewline) {
256 //} while (catcode(c) == catNewline);
257 push_back(Token("par"));
259 push_back(Token('\n', catNewline));
266 push_back(Token(c, catComment));
267 while (is.get(c) && catcode(c) != catNewline)
268 push_back(Token(c, catLetter));
269 push_back(Token(c, catNewline));
272 if (catcode(c) == catNewline) {
273 push_back(Token("par"));
284 error("unexpected end of input");
287 if (catcode(c) == catLetter) {
289 while (is.get(c) && catcode(c) == catLetter)
291 skipSpaceTokens(is, c);
300 push_back(Token(c, catcode(c)));
302 skipSpaceTokens(is, c);
308 cerr << "ignoring a char: " << int(c) << "\n";
313 push_back(Token(c, catcode(c)));
319 void Parser::dump() const
321 cerr << "\nTokens: ";
322 for (unsigned i = 0; i < tokens_.size(); ++i) {
327 cerr << " pos: " << pos_ << "\n";
331 void Parser::error(string const & msg)
333 cerr << "Line ~" << lineno_ << ": parse error: " << msg << endl;
339 string Parser::verbatimOption()
342 if (next_token().character() == '[') {
343 Token t = get_token();
344 for (Token t = get_token(); t.character() != ']' && good(); t = get_token()) {
345 if (t.cat() == catBegin) {
347 res += '{' + verbatim_item() + '}';
356 string Parser::verbatim_item()
361 if (next_token().cat() == catBegin) {
362 Token t = get_token(); // skip brace
364 for (Token t = get_token(); t.cat() != catEnd && good(); t = get_token()) {
365 if (t.cat() == catBegin) {
367 res += '{' + verbatim_item() + '}';
374 return get_token().asInput();
378 void Parser::setCatCode(char c, CatCode cat)
380 theCatcode[(unsigned char)c] = cat;
384 CatCode Parser::getCatCode(char c) const
386 return theCatcode[(unsigned char)c];