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https://git.lyx.org/repos/lyx.git
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1d721b6ea7
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@40909 a592a061-630c-0410-9148-cb99ea01b6c8
682 lines
14 KiB
C++
682 lines
14 KiB
C++
/**
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* \file Parser.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author André Pönitz
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "Encoding.h"
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#include "Parser.h"
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#include "support/textutils.h"
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#include <iostream>
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using namespace std;
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namespace lyx {
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namespace {
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CatCode theCatcode[256];
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void catInit()
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{
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static bool init_done = false;
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if (init_done)
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return;
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init_done = true;
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fill(theCatcode, theCatcode + 256, catOther);
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fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
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fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
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theCatcode[int('\\')] = catEscape;
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theCatcode[int('{')] = catBegin;
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theCatcode[int('}')] = catEnd;
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theCatcode[int('$')] = catMath;
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theCatcode[int('&')] = catAlign;
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theCatcode[int('\n')] = catNewline;
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theCatcode[int('#')] = catParameter;
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theCatcode[int('^')] = catSuper;
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theCatcode[int('_')] = catSub;
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theCatcode[0x7f] = catIgnore;
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theCatcode[int(' ')] = catSpace;
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theCatcode[int('\t')] = catSpace;
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theCatcode[int('\r')] = catNewline;
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theCatcode[int('~')] = catActive;
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theCatcode[int('%')] = catComment;
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// This is wrong!
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theCatcode[int('@')] = catLetter;
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}
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/*!
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* Translate a line ending to '\n'.
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* \p c must have catcode catNewline, and it must be the last character read
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* from \p is.
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*/
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char_type getNewline(idocstream & is, char_type c)
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{
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// we have to handle 3 different line endings:
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// - UNIX (\n)
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// - MAC (\r)
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// - DOS (\r\n)
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if (c == '\r') {
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// MAC or DOS
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char_type wc;
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if (is.get(wc) && wc != '\n') {
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// MAC
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is.putback(wc);
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}
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return '\n';
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}
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// UNIX
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return c;
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}
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CatCode catcode(char_type c)
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{
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if (c < 256)
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return theCatcode[(unsigned char)c];
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return catOther;
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}
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}
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//
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// Token
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//
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ostream & operator<<(ostream & os, Token const & t)
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{
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if (t.cat() == catComment)
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os << '%' << t.cs() << '\n';
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else if (t.cat() == catSpace)
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os << t.cs();
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else if (t.cat() == catEscape)
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os << '\\' << t.cs() << ' ';
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else if (t.cat() == catLetter)
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os << t.cs();
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else if (t.cat() == catNewline)
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os << "[" << t.cs().size() << "\\n," << t.cat() << "]\n";
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else
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os << '[' << t.cs() << ',' << t.cat() << ']';
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return os;
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}
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string Token::asInput() const
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{
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if (cat_ == catComment)
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return '%' + cs_ + '\n';
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if (cat_ == catEscape)
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return '\\' + cs_;
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return cs_;
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}
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bool Token::isAlnumASCII() const
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{
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return cat_ == catLetter ||
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(cat_ == catOther && cs_.length() == 1 && isDigitASCII(cs_[0]));
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}
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#ifdef FILEDEBUG
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void debugToken(std::ostream & os, Token const & t, unsigned int flags)
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{
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char sep = ' ';
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os << "t: " << t << " flags: " << flags;
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if (flags & FLAG_BRACE_LAST) { os << sep << "BRACE_LAST"; sep = '|'; }
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if (flags & FLAG_RIGHT ) { os << sep << "RIGHT" ; sep = '|'; }
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if (flags & FLAG_END ) { os << sep << "END" ; sep = '|'; }
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if (flags & FLAG_BRACK_LAST) { os << sep << "BRACK_LAST"; sep = '|'; }
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if (flags & FLAG_TEXTMODE ) { os << sep << "TEXTMODE" ; sep = '|'; }
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if (flags & FLAG_ITEM ) { os << sep << "ITEM" ; sep = '|'; }
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if (flags & FLAG_LEAVE ) { os << sep << "LEAVE" ; sep = '|'; }
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if (flags & FLAG_SIMPLE ) { os << sep << "SIMPLE" ; sep = '|'; }
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if (flags & FLAG_EQUATION ) { os << sep << "EQUATION" ; sep = '|'; }
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if (flags & FLAG_SIMPLE2 ) { os << sep << "SIMPLE2" ; sep = '|'; }
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if (flags & FLAG_OPTION ) { os << sep << "OPTION" ; sep = '|'; }
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if (flags & FLAG_BRACED ) { os << sep << "BRACED" ; sep = '|'; }
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if (flags & FLAG_CELL ) { os << sep << "CELL" ; sep = '|'; }
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if (flags & FLAG_TABBING ) { os << sep << "TABBING" ; sep = '|'; }
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os << "\n";
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}
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#endif
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//
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// Parser
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//
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Parser::Parser(idocstream & is)
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: lineno_(0), pos_(0), iss_(0), is_(is), encoding_latex_("utf8")
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{
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}
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Parser::Parser(string const & s)
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: lineno_(0), pos_(0),
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iss_(new idocstringstream(from_utf8(s))), is_(*iss_),
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encoding_latex_("utf8")
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{
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}
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Parser::~Parser()
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{
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delete iss_;
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}
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void Parser::setEncoding(std::string const & e)
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{
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Encoding const * enc = encodings.fromLaTeXName(e);
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if (!enc) {
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cerr << "Unknown encoding " << e << ". Ignoring." << std::endl;
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return;
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}
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//cerr << "setting encoding to " << enc->iconvName() << std::endl;
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is_ << lyx::setEncoding(enc->iconvName());
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encoding_latex_ = e;
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}
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void Parser::push_back(Token const & t)
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{
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tokens_.push_back(t);
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}
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// We return a copy here because the tokens_ vector may get reallocated
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Token const Parser::prev_token() const
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{
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static const Token dummy;
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return pos_ > 1 ? tokens_[pos_ - 2] : dummy;
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}
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// We return a copy here because the tokens_ vector may get reallocated
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Token const Parser::curr_token() const
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{
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static const Token dummy;
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return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
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}
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// We return a copy here because the tokens_ vector may get reallocated
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Token const Parser::next_token()
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{
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static const Token dummy;
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return good() ? tokens_[pos_] : dummy;
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}
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// We return a copy here because the tokens_ vector may get reallocated
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Token const Parser::next_next_token()
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{
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static const Token dummy;
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// If good() has not been called after the last get_token() we need
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// to tokenize two more tokens.
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if (pos_ + 1 >= tokens_.size()) {
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tokenize_one();
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tokenize_one();
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}
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return pos_ + 1 < tokens_.size() ? tokens_[pos_ + 1] : dummy;
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}
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// We return a copy here because the tokens_ vector may get reallocated
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Token const Parser::get_token()
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{
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static const Token dummy;
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//cerr << "looking at token " << tokens_[pos_] << " pos: " << pos_ << '\n';
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return good() ? tokens_[pos_++] : dummy;
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}
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bool Parser::isParagraph()
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{
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// A new paragraph in TeX ist started
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// - either by a newline, following any amount of whitespace
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// characters (including zero), and another newline
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// - or the token \par
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if (curr_token().cat() == catNewline &&
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(curr_token().cs().size() > 1 ||
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(next_token().cat() == catSpace &&
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next_next_token().cat() == catNewline)))
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return true;
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if (curr_token().cat() == catEscape && curr_token().cs() == "par")
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return true;
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return false;
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}
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bool Parser::skip_spaces(bool skip_comments)
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{
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// We just silently return if we have no more tokens.
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// skip_spaces() should be callable at any time,
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// the caller must check p::good() anyway.
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bool skipped = false;
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while (good()) {
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get_token();
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if (isParagraph()) {
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putback();
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break;
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}
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if (curr_token().cat() == catSpace ||
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curr_token().cat() == catNewline) {
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skipped = true;
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continue;
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}
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if ((curr_token().cat() == catComment && curr_token().cs().empty()))
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continue;
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if (skip_comments && curr_token().cat() == catComment) {
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// If positions_ is not empty we are doing some kind
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// of look ahead
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if (!positions_.empty())
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cerr << " Ignoring comment: "
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<< curr_token().asInput();
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} else {
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putback();
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break;
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}
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}
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return skipped;
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}
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void Parser::unskip_spaces(bool skip_comments)
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{
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while (pos_ > 0) {
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if ( curr_token().cat() == catSpace ||
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(curr_token().cat() == catNewline && curr_token().cs().size() == 1))
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putback();
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else if (skip_comments && curr_token().cat() == catComment) {
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// TODO: Get rid of this
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// If positions_ is not empty we are doing some kind
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// of look ahead
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if (!positions_.empty())
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cerr << "Unignoring comment: "
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<< curr_token().asInput();
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putback();
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}
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else
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break;
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}
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}
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void Parser::putback()
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{
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--pos_;
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}
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void Parser::pushPosition()
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{
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positions_.push_back(pos_);
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}
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void Parser::popPosition()
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{
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pos_ = positions_.back();
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positions_.pop_back();
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}
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bool Parser::good()
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{
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if (pos_ < tokens_.size())
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return true;
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tokenize_one();
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return pos_ < tokens_.size();
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}
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char Parser::getChar()
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{
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if (!good())
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error("The input stream is not well...");
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return get_token().character();
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}
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bool Parser::hasOpt()
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{
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// An optional argument can occur in any of the following forms:
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// - \foo[bar]
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// - \foo [bar]
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// - \foo
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// [bar]
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// - \foo %comment
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// [bar]
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// remember current position
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unsigned int oldpos = pos_;
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// skip spaces and comments
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while (good()) {
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get_token();
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if (isParagraph()) {
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putback();
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break;
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}
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if (curr_token().cat() == catSpace ||
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curr_token().cat() == catNewline ||
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curr_token().cat() == catComment)
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continue;
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putback();
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break;
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}
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bool const retval = (next_token().asInput() == "[");
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pos_ = oldpos;
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return retval;
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}
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Parser::Arg Parser::getFullArg(char left, char right)
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{
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skip_spaces(true);
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// This is needed if a partial file ends with a command without arguments,
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// e. g. \medskip
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if (! good())
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return make_pair(false, string());
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string result;
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char c = getChar();
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if (c != left) {
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putback();
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return make_pair(false, string());
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} else
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while ((c = getChar()) != right && good()) {
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// Ignore comments
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if (curr_token().cat() == catComment) {
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if (!curr_token().cs().empty())
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cerr << "Ignoring comment: " << curr_token().asInput();
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}
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else
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result += curr_token().asInput();
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}
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return make_pair(true, result);
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}
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string Parser::getArg(char left, char right)
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{
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return getFullArg(left, right).second;
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}
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string Parser::getFullOpt(bool keepws)
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{
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Arg arg = getFullArg('[', ']');
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if (arg.first)
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return '[' + arg.second + ']';
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if (keepws)
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unskip_spaces(true);
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return string();
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}
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string Parser::getOpt(bool keepws)
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{
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string const res = getArg('[', ']');
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if (res.empty()) {
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if (keepws)
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unskip_spaces(true);
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return string();
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}
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return '[' + res + ']';
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}
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string Parser::getFullParentheseArg()
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{
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Arg arg = getFullArg('(', ')');
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if (arg.first)
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return '(' + arg.second + ')';
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return string();
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}
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string const Parser::verbatimEnvironment(string const & name)
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{
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if (!good())
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return string();
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ostringstream os;
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for (Token t = get_token(); good(); t = get_token()) {
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if (t.cat() == catBegin) {
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putback();
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os << '{' << verbatim_item() << '}';
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} else if (t.asInput() == "\\begin") {
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string const env = getArg('{', '}');
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os << "\\begin{" << env << '}'
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<< verbatimEnvironment(env)
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<< "\\end{" << env << '}';
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} else if (t.asInput() == "\\end") {
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string const end = getArg('{', '}');
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if (end != name)
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cerr << "\\end{" << end
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<< "} does not match \\begin{" << name
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<< "}." << endl;
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return os.str();
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} else
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os << t.asInput();
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}
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cerr << "unexpected end of input" << endl;
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return os.str();
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}
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string const Parser::plainEnvironment(string const & name)
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{
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if (!good())
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return string();
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ostringstream os;
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for (Token t = get_token(); good(); t = get_token()) {
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if (t.asInput() == "\\end") {
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string const end = getArg('{', '}');
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if (end == name)
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return os.str();
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else
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os << "\\end{" << end << '}';
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} else
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os << t.asInput();
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}
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cerr << "unexpected end of input" << endl;
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return os.str();
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}
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string const Parser::plainCommand(char left, char right, string const & name)
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{
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if (!good())
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return string();
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// check if first token is really the start character
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Token tok = get_token();
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if (tok.character() != left) {
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cerr << "first character does not match start character of command \\" << name << endl;
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return string();
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}
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ostringstream os;
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for (Token t = get_token(); good(); t = get_token()) {
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if (t.character() == right) {
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return os.str();
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} else
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os << t.asInput();
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}
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cerr << "unexpected end of input" << endl;
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return os.str();
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}
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void Parser::tokenize_one()
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{
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catInit();
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char_type c;
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if (!is_.get(c))
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return;
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switch (catcode(c)) {
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case catSpace: {
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docstring s(1, c);
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while (is_.get(c) && catcode(c) == catSpace)
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s += c;
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if (catcode(c) != catSpace)
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is_.putback(c);
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push_back(Token(s, catSpace));
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break;
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}
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case catNewline: {
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++lineno_;
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docstring s(1, getNewline(is_, c));
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while (is_.get(c) && catcode(c) == catNewline) {
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++lineno_;
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s += getNewline(is_, c);
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}
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if (catcode(c) != catNewline)
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is_.putback(c);
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push_back(Token(s, catNewline));
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break;
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}
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case catComment: {
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// We don't treat "%\n" combinations here specially because
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// we want to preserve them in the preamble
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docstring s;
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while (is_.get(c) && catcode(c) != catNewline)
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s += c;
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// handle possible DOS line ending
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if (catcode(c) == catNewline)
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c = getNewline(is_, c);
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// Note: The '%' at the beginning and the '\n' at the end
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// of the comment are not stored.
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|
++lineno_;
|
|
push_back(Token(s, catComment));
|
|
break;
|
|
}
|
|
|
|
case catEscape: {
|
|
is_.get(c);
|
|
if (!is_) {
|
|
error("unexpected end of input");
|
|
} else {
|
|
docstring s(1, c);
|
|
if (catcode(c) == catLetter) {
|
|
// collect letters
|
|
while (is_.get(c) && catcode(c) == catLetter)
|
|
s += c;
|
|
if (catcode(c) != catLetter)
|
|
is_.putback(c);
|
|
}
|
|
push_back(Token(s, catEscape));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case catIgnore: {
|
|
cerr << "ignoring a char: " << c << "\n";
|
|
break;
|
|
}
|
|
|
|
default:
|
|
push_back(Token(docstring(1, c), catcode(c)));
|
|
}
|
|
//cerr << tokens_.back();
|
|
}
|
|
|
|
|
|
void Parser::dump() const
|
|
{
|
|
cerr << "\nTokens: ";
|
|
for (unsigned i = 0; i < tokens_.size(); ++i) {
|
|
if (i == pos_)
|
|
cerr << " <#> ";
|
|
cerr << tokens_[i];
|
|
}
|
|
cerr << " pos: " << pos_ << "\n";
|
|
}
|
|
|
|
|
|
void Parser::error(string const & msg)
|
|
{
|
|
cerr << "Line ~" << lineno_ << ": parse error: " << msg << endl;
|
|
dump();
|
|
//exit(1);
|
|
}
|
|
|
|
|
|
string Parser::verbatimOption()
|
|
{
|
|
string res;
|
|
if (next_token().character() == '[') {
|
|
Token t = get_token();
|
|
for (t = get_token(); t.character() != ']' && good(); t = get_token()) {
|
|
if (t.cat() == catBegin) {
|
|
putback();
|
|
res += '{' + verbatim_item() + '}';
|
|
} else
|
|
res += t.cs();
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
string Parser::verbatim_item()
|
|
{
|
|
if (!good())
|
|
error("stream bad");
|
|
skip_spaces();
|
|
if (next_token().cat() == catBegin) {
|
|
Token t = get_token(); // skip brace
|
|
string res;
|
|
for (Token t = get_token(); t.cat() != catEnd && good(); t = get_token()) {
|
|
if (t.cat() == catBegin) {
|
|
putback();
|
|
res += '{' + verbatim_item() + '}';
|
|
}
|
|
else
|
|
res += t.asInput();
|
|
}
|
|
return res;
|
|
}
|
|
return get_token().asInput();
|
|
}
|
|
|
|
|
|
void Parser::reset()
|
|
{
|
|
pos_ = 0;
|
|
}
|
|
|
|
|
|
void Parser::setCatCode(char c, CatCode cat)
|
|
{
|
|
theCatcode[(unsigned char)c] = cat;
|
|
}
|
|
|
|
|
|
CatCode Parser::getCatCode(char c) const
|
|
{
|
|
return theCatcode[(unsigned char)c];
|
|
}
|
|
|
|
|
|
} // namespace lyx
|