mirror of
https://git.lyx.org/repos/lyx.git
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df4f08862e
I added it because of a misunderstanding. If the encoding is really set too late, to_utf8() in the Token constructor would probably fail, but a non-empty putback buffer is no problem, since it was always created via to_utf8() -> from_utf8().
830 lines
17 KiB
C++
830 lines
17 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/foreach.h"
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#include "support/lstrings.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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using namespace lyx::support;
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namespace lyx {
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namespace {
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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(iparserdocstream & 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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}
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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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// Wrapper
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//
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void iparserdocstream::setEncoding(std::string const & e)
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{
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is_ << lyx::setEncoding(e);
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}
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void iparserdocstream::putback(char_type c)
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{
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s_ = c + s_;
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}
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void iparserdocstream::putback(docstring s)
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{
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s_ = s + s_;
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}
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iparserdocstream & iparserdocstream::get(char_type &c)
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{
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if (s_.empty())
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is_.get(c);
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else {
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//cerr << "unparsed: " << to_utf8(s_) <<endl;
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c = s_[0];
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s_.erase(0,1);
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}
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return *this;
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}
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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_iconv_("UTF-8"),
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theCatcodesType_(NORMAL_CATCODES), curr_cat_(UNDECIDED_CATCODES)
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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_iconv_("UTF-8"),
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theCatcodesType_(NORMAL_CATCODES), curr_cat_(UNDECIDED_CATCODES)
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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::deparse()
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{
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string s;
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for(size_type i = pos_ ; i < tokens_.size() ; ++i) {
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s += tokens_[i].asInput();
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}
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is_.putback(from_utf8(s));
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tokens_.erase(tokens_.begin() + pos_, tokens_.end());
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// make sure that next token is read
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tokenize_one();
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}
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bool Parser::setEncoding(std::string const & e, int const & p)
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{
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// We may (and need to) use unsafe encodings here: Since the text is
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// converted to unicode while reading from is_, we never see text in
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// the original encoding of the parser, but operate on utf8 strings
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// instead. Therefore, we cannot misparse high bytes as {, } or \\.
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Encoding const * const enc = encodings.fromLaTeXName(e, p, true);
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if (!enc) {
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cerr << "Unknown encoding " << e << ". Ignoring." << std::endl;
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return false;
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}
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return setEncoding(enc->iconvName());
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}
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void Parser::catInit()
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{
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if (curr_cat_ == theCatcodesType_)
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return;
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curr_cat_ = theCatcodesType_;
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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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// This is wrong!
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theCatcode_[int('@')] = catLetter;
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if (theCatcodesType_ == NORMAL_CATCODES) {
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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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}
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}
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CatCode Parser::catcode(char_type c) const
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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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void Parser::setCatcode(char c, CatCode cat)
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{
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theCatcode_[(unsigned char)c] = cat;
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deparse();
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}
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void Parser::setCatcodes(cat_type t)
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{
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theCatcodesType_ = t;
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deparse();
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}
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bool Parser::setEncoding(std::string const & e)
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{
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//cerr << "setting encoding to " << e << std::endl;
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encoding_iconv_ = e;
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is_.setEncoding(e);
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return true;
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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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if (!good())
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return dummy;
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if (pos_ >= tokens_.size())
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tokenize_one();
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return pos_ < tokens_.size() ? 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())
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return dummy;
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// If tokenize_one() has not been called after the last get_token() we
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// need to tokenize two more tokens.
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if (pos_ >= tokens_.size()) {
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tokenize_one();
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if (pos_ + 1 >= tokens_.size())
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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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if (!good())
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return dummy;
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if (pos_ >= tokens_.size()) {
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tokenize_one();
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if (pos_ >= tokens_.size())
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return dummy;
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}
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// cerr << "looking at token " << tokens_[pos_]
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// << " pos: " << pos_ << '\n';
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return tokens_[pos_++];
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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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deparse();
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}
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void Parser::dropPosition()
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{
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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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if (!is_.good())
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return false;
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return is_.peek() != idocstream::traits_type::eof();
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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, bool allow_escaping)
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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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Token t = get_token();
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if (t.cat() == catComment || t.cat() == catEscape ||
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t.character() != 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 (good()) {
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t = get_token();
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// Ignore comments
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if (t.cat() == catComment) {
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if (!t.cs().empty())
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cerr << "Ignoring comment: " << t.asInput();
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continue;
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}
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if (allow_escaping) {
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if (t.cat() != catEscape && t.character() == right)
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break;
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} else {
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if (t.character() == right) {
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if (t.cat() == catEscape)
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result += '\\';
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break;
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}
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}
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result += t.asInput();
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}
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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, bool allow_escaping)
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{
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return getFullArg(left, right, allow_escaping).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::ertEnvironment(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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<< ertEnvironment(env)
|
|
<< "\\end{" << env << '}';
|
|
} else if (t.asInput() == "\\end") {
|
|
string const end = getArg('{', '}');
|
|
if (end != name)
|
|
cerr << "\\end{" << end
|
|
<< "} does not match \\begin{" << name
|
|
<< "}." << endl;
|
|
return os.str();
|
|
} else
|
|
os << t.asInput();
|
|
}
|
|
cerr << "unexpected end of input" << endl;
|
|
return os.str();
|
|
}
|
|
|
|
|
|
string const Parser::plainEnvironment(string const & name)
|
|
{
|
|
if (!good())
|
|
return string();
|
|
|
|
ostringstream os;
|
|
for (Token t = get_token(); good(); t = get_token()) {
|
|
if (t.asInput() == "\\end") {
|
|
string const end = getArg('{', '}');
|
|
if (end == name)
|
|
return os.str();
|
|
else
|
|
os << "\\end{" << end << '}';
|
|
} else
|
|
os << t.asInput();
|
|
}
|
|
cerr << "unexpected end of input" << endl;
|
|
return os.str();
|
|
}
|
|
|
|
|
|
string const Parser::plainCommand(char left, char right, string const & name)
|
|
{
|
|
if (!good())
|
|
return string();
|
|
// check if first token is really the start character
|
|
Token tok = get_token();
|
|
if (tok.character() != left) {
|
|
cerr << "first character does not match start character of command \\" << name << endl;
|
|
return string();
|
|
}
|
|
ostringstream os;
|
|
for (Token t = get_token(); good(); t = get_token()) {
|
|
if (t.character() == right) {
|
|
return os.str();
|
|
} else
|
|
os << t.asInput();
|
|
}
|
|
cerr << "unexpected end of input" << endl;
|
|
return os.str();
|
|
}
|
|
|
|
|
|
Parser::Arg Parser::verbatimStuff(string const & end_string, bool const allow_linebreak)
|
|
{
|
|
if (!good())
|
|
return Arg(false, string());
|
|
|
|
pushPosition();
|
|
ostringstream oss;
|
|
size_t match_index = 0;
|
|
setCatcodes(VERBATIM_CATCODES);
|
|
for (Token t = get_token(); good(); t = get_token()) {
|
|
// FIXME t.asInput() might be longer than we need ?
|
|
if (t.asInput() == end_string.substr(match_index,
|
|
t.asInput().length())) {
|
|
match_index += t.asInput().length();
|
|
if (match_index >= end_string.length())
|
|
break;
|
|
} else {
|
|
if (!allow_linebreak && t.asInput() == "\n") {
|
|
cerr << "unexpected end of input" << endl;
|
|
popPosition();
|
|
setCatcodes(NORMAL_CATCODES);
|
|
return Arg(false, string());
|
|
}
|
|
if (match_index) {
|
|
oss << end_string.substr(0, match_index)
|
|
<< t.asInput();
|
|
match_index = 0;
|
|
} else
|
|
oss << t.asInput();
|
|
}
|
|
}
|
|
|
|
if (!good()) {
|
|
cerr << "unexpected end of input" << endl;
|
|
popPosition();
|
|
setCatcodes(NORMAL_CATCODES);
|
|
return Arg(false, string());
|
|
}
|
|
setCatcodes(NORMAL_CATCODES);
|
|
dropPosition();
|
|
return Arg(true, oss.str());
|
|
}
|
|
|
|
|
|
string const Parser::verbatimEnvironment(string const & name)
|
|
{
|
|
//FIXME: do something if endstring is not found
|
|
string s = verbatimStuff("\\end{" + name + "}").second;
|
|
// ignore one newline at beginning or end of string
|
|
if (prefixIs(s, "\n"))
|
|
s.erase(0,1);
|
|
if (suffixIs(s, "\n"))
|
|
s.erase(s.length() - 1,1);
|
|
return s;
|
|
}
|
|
|
|
|
|
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::tokenize_one()
|
|
{
|
|
catInit();
|
|
char_type c;
|
|
if (!is_.get(c))
|
|
return;
|
|
|
|
switch (catcode(c)) {
|
|
case catSpace: {
|
|
docstring s(1, c);
|
|
while (is_.get(c) && catcode(c) == catSpace)
|
|
s += c;
|
|
if (catcode(c) != catSpace)
|
|
is_.putback(c);
|
|
push_back(Token(s, catSpace));
|
|
break;
|
|
}
|
|
|
|
case catNewline: {
|
|
++lineno_;
|
|
docstring s(1, getNewline(is_, c));
|
|
while (is_.get(c) && catcode(c) == catNewline) {
|
|
++lineno_;
|
|
s += getNewline(is_, c);
|
|
}
|
|
if (catcode(c) != catNewline)
|
|
is_.putback(c);
|
|
push_back(Token(s, catNewline));
|
|
break;
|
|
}
|
|
|
|
case catComment: {
|
|
// We don't treat "%\n" combinations here specially because
|
|
// we want to preserve them in the preamble
|
|
docstring s;
|
|
while (is_.get(c) && catcode(c) != catNewline)
|
|
s += c;
|
|
// handle possible DOS line ending
|
|
if (catcode(c) == catNewline)
|
|
c = getNewline(is_, c);
|
|
// Note: The '%' at the beginning and the '\n' at the end
|
|
// of the comment are not stored.
|
|
++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);
|
|
}
|
|
|
|
|
|
void Parser::reset()
|
|
{
|
|
pos_ = 0;
|
|
}
|
|
|
|
|
|
} // namespace lyx
|