mirror of
https://git.lyx.org/repos/lyx.git
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246b54496e
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@9203 a592a061-630c-0410-9148-cb99ea01b6c8
468 lines
8.6 KiB
C
468 lines
8.6 KiB
C
/**
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* \file texparser.C
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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 "texparser.h"
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#include <iostream>
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#include <sstream>
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using std::cerr;
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using std::endl;
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using std::fill;
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using std::istream;
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using std::istringstream;
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using std::ostream;
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using std::string;
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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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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 getNewline(istream & is, char 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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if (is.get(c) && c != '\n') {
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// MAC
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is.putback(c);
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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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// catcodes
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//
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CatCode catcode(unsigned char c)
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{
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return theCatcode[c];
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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.character();
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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.character() << ',' << t.cat() << ']';
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return os;
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}
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string Token::asString() const
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{
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return cs_.size() ? cs_ : string(1, char_);
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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_ == catSpace || cat_ == catNewline)
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return cs_;
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return char_ ? string(1, char_) : '\\' + cs_;
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}
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//
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// Parser
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//
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Parser::Parser(istream & is)
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: lineno_(0), pos_(0)
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{
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tokenize(is);
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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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{
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istringstream is(s);
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tokenize(is);
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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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void Parser::pop_back()
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{
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tokens_.pop_back();
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}
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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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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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Token const & Parser::next_token() const
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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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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() const
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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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pos_ < tokens_.size() - 1 &&
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tokens_[pos_ + 1].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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void 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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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 && curr_token().cs().empty()))
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continue;
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if (skip_comments && curr_token().cat() == catComment)
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cerr << " Ignoring comment: " << 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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}
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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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cerr << "Unignoring comment: " << 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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bool Parser::good() const
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{
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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 tokens_[pos_++].character();
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}
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string Parser::getArg(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 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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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 result;
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}
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string Parser::getOpt()
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{
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string const res = getArg('[', ']');
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return res.size() ? '[' + res + ']' : string();
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}
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void Parser::tokenize(istream & is)
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{
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static bool init_done = false;
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if (!init_done) {
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catInit();
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init_done = true;
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}
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char c;
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while (is.get(c)) {
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//cerr << "reading c: " << c << "\n";
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switch (catcode(c)) {
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case catSpace: {
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string 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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string 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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string 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_;
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push_back(Token(s, catComment));
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break;
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}
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case catEscape: {
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is.get(c);
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if (!is) {
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error("unexpected end of input");
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} else {
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string s(1, c);
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if (catcode(c) == catLetter) {
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// collect letters
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while (is.get(c) && catcode(c) == catLetter)
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s += c;
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if (catcode(c) != catLetter)
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is.putback(c);
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}
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push_back(Token(s, catEscape));
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}
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break;
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}
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case catIgnore: {
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cerr << "ignoring a char: " << int(c) << "\n";
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break;
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}
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default:
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push_back(Token(c, catcode(c)));
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}
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}
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}
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void Parser::dump() const
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{
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cerr << "\nTokens: ";
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for (unsigned i = 0; i < tokens_.size(); ++i) {
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if (i == pos_)
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cerr << " <#> ";
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cerr << tokens_[i];
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}
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cerr << " pos: " << pos_ << "\n";
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}
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void Parser::error(string const & msg)
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{
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cerr << "Line ~" << lineno_ << ": parse error: " << msg << endl;
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dump();
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//exit(1);
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}
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string Parser::verbatimOption()
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{
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string res;
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if (next_token().character() == '[') {
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Token t = get_token();
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for (Token t = get_token(); t.character() != ']' && good(); t = get_token()) {
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if (t.cat() == catBegin) {
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putback();
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res += '{' + verbatim_item() + '}';
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} else
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res += t.asString();
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}
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}
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return res;
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}
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string Parser::verbatim_item()
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{
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if (!good())
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error("stream bad");
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skip_spaces();
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if (next_token().cat() == catBegin) {
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Token t = get_token(); // skip brace
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string res;
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for (Token t = get_token(); t.cat() != catEnd && good(); t = get_token()) {
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if (t.cat() == catBegin) {
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putback();
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res += '{' + verbatim_item() + '}';
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}
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else
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res += t.asInput();
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}
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return res;
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}
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return get_token().asInput();
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}
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void Parser::reset()
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{
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pos_ = 0;
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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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}
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CatCode Parser::getCatCode(char c) const
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{
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return theCatcode[(unsigned char)c];
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}
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