mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-24 18:43:37 +00:00
374 lines
12 KiB
C++
374 lines
12 KiB
C++
// -*- C++ -*-
|
|
/**
|
|
* \file Parser.h
|
|
* This file is part of LyX, the document processor.
|
|
* Licence details can be found in the file COPYING.
|
|
*
|
|
* \author André Pönitz
|
|
*
|
|
* Full author contact details are available in file CREDITS.
|
|
*/
|
|
|
|
#ifndef PARSER_H
|
|
#define PARSER_H
|
|
|
|
#include <string>
|
|
#include <utility>
|
|
#include <vector>
|
|
|
|
#include "support/docstream.h"
|
|
|
|
namespace lyx {
|
|
|
|
|
|
enum mode_type {UNDECIDED_MODE, TEXT_MODE, MATH_MODE, MATHTEXT_MODE, TABLE_MODE};
|
|
|
|
mode_type asMode(mode_type oldmode, std::string const & str);
|
|
|
|
|
|
// These are TeX's catcodes
|
|
enum CatCode {
|
|
catEscape, // 0 backslash
|
|
catBegin, // 1 {
|
|
catEnd, // 2 }
|
|
catMath, // 3 $
|
|
catAlign, // 4 &
|
|
catNewline, // 5 ^^M
|
|
catParameter, // 6 #
|
|
catSuper, // 7 ^
|
|
catSub, // 8 _
|
|
catIgnore, // 9
|
|
catSpace, // 10 space
|
|
catLetter, // 11 a-zA-Z
|
|
catOther, // 12 none of the above
|
|
catActive, // 13 ~
|
|
catComment, // 14 %
|
|
catInvalid // 15 <delete>
|
|
};
|
|
|
|
enum cat_type {
|
|
NORMAL_CATCODES,
|
|
VERBATIM_CATCODES,
|
|
UNDECIDED_CATCODES
|
|
};
|
|
|
|
|
|
enum {
|
|
FLAG_BRACE_LAST = 1 << 1, // last closing brace ends the parsing
|
|
FLAG_RIGHT = 1 << 2, // next \\right ends the parsing process
|
|
FLAG_END = 1 << 3, // next \\end ends the parsing process
|
|
FLAG_BRACK_LAST = 1 << 4, // next closing bracket ends the parsing
|
|
FLAG_TEXTMODE = 1 << 5, // we are in a box
|
|
FLAG_ITEM = 1 << 6, // read a (possibly braced token)
|
|
FLAG_LEAVE = 1 << 7, // leave the loop at the end
|
|
FLAG_SIMPLE = 1 << 8, // next $ leaves the loop
|
|
FLAG_EQUATION = 1 << 9, // next \] leaves the loop
|
|
FLAG_SIMPLE2 = 1 << 10, // next \) leaves the loop
|
|
FLAG_OPTION = 1 << 11, // read [...] style option
|
|
FLAG_BRACED = 1 << 12, // read {...} style argument
|
|
FLAG_CELL = 1 << 13, // read table cell
|
|
FLAG_TABBING = 1 << 14 // We are inside a tabbing environment
|
|
};
|
|
|
|
|
|
|
|
//
|
|
// Helper class for parsing
|
|
//
|
|
|
|
class Token {
|
|
public:
|
|
///
|
|
Token() : cs_(), cat_(catIgnore) {}
|
|
///
|
|
Token(docstring const & cs, CatCode cat) : cs_(to_utf8(cs)), cat_(cat) {}
|
|
|
|
/// Returns the token as string
|
|
std::string const & cs() const { return cs_; }
|
|
/// Returns the catcode of the token
|
|
CatCode cat() const { return cat_; }
|
|
/** Get the character of tokens that were constructed from a single
|
|
* character input or a two character input and cat_ == catEscape.
|
|
* FIXME: The intended usage is not clear. The Token class in
|
|
* ../mathed/MathParser.cpp (which is the anchestor of this
|
|
* class) uses a separate char member for this method. I
|
|
* believe that the intended usage is to not cover tokens with
|
|
* catEscape or catComment, e.g. \code
|
|
* return (cs_.empty() || cat_ == catEscape || cat_ == catComment) ? 0 : cs_[0];
|
|
* \endcode
|
|
* All usages of this method should be checked. gb 2011-01-05
|
|
*/
|
|
char character() const { return cs_.empty() ? 0 : cs_[0]; }
|
|
/// Returns the token verbatim
|
|
std::string asInput() const;
|
|
/// Is the token an alphanumerical character?
|
|
bool isAlnumASCII() const;
|
|
|
|
private:
|
|
///
|
|
std::string cs_;
|
|
///
|
|
CatCode cat_;
|
|
};
|
|
|
|
std::ostream & operator<<(std::ostream & os, Token const & t);
|
|
|
|
#ifdef FILEDEBUG
|
|
extern void debugToken(std::ostream & os, Token const & t, unsigned int flags);
|
|
#endif
|
|
|
|
/// A docstream version that supports putback even when not buffered
|
|
class iparserdocstream
|
|
{
|
|
public:
|
|
typedef idocstream::int_type int_type;
|
|
|
|
iparserdocstream(idocstream & is) : is_(is) {}
|
|
|
|
#ifdef LYX_USE_CXX11
|
|
/// Like std::istream::operator bool()
|
|
/// Do not convert is_ implicitly to bool, since that is forbidden in C++11.
|
|
explicit operator bool() const { return s_.empty() ? !is_.fail() : true; }
|
|
#else
|
|
/// Like std::istream::operator void*()
|
|
operator void*() const { return (s_.empty() && is_.fail()) ?
|
|
0 : const_cast<iparserdocstream *>(this); }
|
|
#endif
|
|
|
|
/// change the encoding of the input stream to \p e (iconv name)
|
|
void setEncoding(std::string const & e);
|
|
|
|
// add to the list of characters to read before actually reading
|
|
// the stream
|
|
void putback(char_type c);
|
|
|
|
// add to the list of characters to read before actually reading
|
|
// the stream
|
|
void putback(docstring s);
|
|
|
|
/// Like std::istream::get()
|
|
iparserdocstream & get(char_type &c);
|
|
|
|
/// Like std::istream::good()
|
|
bool good() const { return s_.empty() ? is_.good() : true; }
|
|
|
|
/// Like std::istream::peek()
|
|
int_type peek() const { return s_.empty() ? is_.peek() : s_[0]; }
|
|
private:
|
|
///
|
|
idocstream & is_;
|
|
/// characters to read before actually reading the stream
|
|
docstring s_;
|
|
};
|
|
|
|
|
|
/*!
|
|
* Actual parser class
|
|
*
|
|
* The parser parses every character of the inputstream into a token
|
|
* and classifies the token.
|
|
* The following transformations are done:
|
|
* - Consecutive spaces are combined into one single token with CatCode catSpace
|
|
* - Consecutive newlines are combined into one single token with CatCode catNewline
|
|
* - Comments and %\n combinations are parsed into one token with CatCode catComment
|
|
*/
|
|
|
|
class Parser {
|
|
/// noncopyable
|
|
Parser(Parser const & p);
|
|
Parser & operator=(Parser const & p);
|
|
public:
|
|
///
|
|
Parser(idocstream & is, std::string const & fixedenc);
|
|
///
|
|
Parser(std::string const & s);
|
|
///
|
|
~Parser();
|
|
|
|
/** forget already parsed next tokens and put the
|
|
* corresponding characters into the input stream for
|
|
* re-reading. Useful when changing catcodes. */
|
|
void deparse();
|
|
|
|
/// change the encoding of the input stream according to \p encoding
|
|
/// (latex name) and package \p package
|
|
bool setEncoding(std::string const & encoding, int const & package);
|
|
/// change the encoding of the input stream to \p encoding (iconv name)
|
|
bool setEncoding(std::string const & encoding);
|
|
/// get the current iconv encoding of the input stream
|
|
std::string getEncoding() const { return encoding_iconv_; }
|
|
|
|
///
|
|
CatCode catcode(char_type c) const;
|
|
///
|
|
void setCatcode(char c, CatCode cat);
|
|
/// set parser to normal or verbatim mode
|
|
void setCatcodes(cat_type t);
|
|
|
|
///
|
|
int lineno() const { return lineno_; }
|
|
///
|
|
void putback();
|
|
/// store current position
|
|
void pushPosition();
|
|
/// restore previous position
|
|
void popPosition();
|
|
/// forget last saved position
|
|
void dropPosition();
|
|
/// dump contents to screen
|
|
void dump() const;
|
|
|
|
/// Does an optional argument follow after the current token?
|
|
bool hasOpt();
|
|
///
|
|
typedef std::pair<bool, std::string> Arg;
|
|
/*!
|
|
* Get an argument enclosed by \p left and \p right.
|
|
* If \p allow_escaping is true, a right delimiter escaped by a
|
|
* backslash does not count as delimiter, but is included in the
|
|
* argument.
|
|
* \returns wether an argument was found in \p Arg.first and the
|
|
* argument in \p Arg.second. \see getArg().
|
|
*/
|
|
Arg getFullArg(char left, char right, bool allow_escaping = true);
|
|
/*!
|
|
* Get an argument enclosed by \p left and \p right.
|
|
* If \p allow_escaping is true, a right delimiter escaped by a
|
|
* backslash does not count as delimiter, but is included in the
|
|
* argument.
|
|
* \returns the argument (without \p left and \p right) or the empty
|
|
* string if the next non-space token is not \p left. Use
|
|
* getFullArg() if you need to know wether there was an empty
|
|
* argument or no argument at all.
|
|
*/
|
|
std::string getArg(char left, char right, bool allow_escaping = true);
|
|
/*!
|
|
* Like getOpt(), but distinguishes between a missing argument ""
|
|
* and an empty argument "[]".
|
|
*/
|
|
std::string getFullOpt(bool keepws = false);
|
|
/*!
|
|
* \returns getArg('[', ']') including the brackets or the
|
|
* empty string if there is no such argument.
|
|
* No whitespace is eaten if \p keepws is true and no optional
|
|
* argument exists. This is important if an optional argument is
|
|
* parsed that would go after a command in ERT: In this case the
|
|
* whitespace is needed to separate the ERT from the subsequent
|
|
* word. Without it, the ERT and the next word would be concatenated
|
|
* during .tex export, thus creating an invalid command.
|
|
*/
|
|
std::string getOpt(bool keepws = false);
|
|
/*!
|
|
* \returns getFullArg('(', ')') including the parentheses or the
|
|
* empty string if there is no such argument.
|
|
*/
|
|
std::string getFullParentheseArg();
|
|
/*!
|
|
* \returns the contents of the environment \p name.
|
|
* <tt>\begin{name}</tt> must be parsed already, <tt>\end{name}</tt>
|
|
* is parsed but not returned. This parses nested environments properly.
|
|
*/
|
|
std::string const ertEnvironment(std::string const & name);
|
|
/*
|
|
* The same as ertEnvironment(std::string const & name) but
|
|
* \begin and \end commands inside the name environment are not parsed.
|
|
* This function is designed to parse verbatim environments.
|
|
*/
|
|
std::string const plainEnvironment(std::string const & name);
|
|
/*
|
|
* Basically the same as plainEnvironment(std::string const & name) but
|
|
* instead of \begin and \end commands the parsing is started/stopped
|
|
* at given characters.
|
|
* This function is designed to parse verbatim commands.
|
|
*/
|
|
std::string const plainCommand(char left, char right, std::string const & name);
|
|
/*
|
|
* Basically the same as plainEnvironment() but the parsing is
|
|
* stopped at string \p end_string. Contrary to the other
|
|
* methods, this uses proper catcode setting. This function is
|
|
* designed to parse verbatim environments and command. The
|
|
* intention is to eventually replace all of its siblings. the
|
|
* member \p first of the result tells whether the arg was
|
|
* found and the member \p second is the value. If \p
|
|
* allow_linebreak is false, then the parsing is limited to one line
|
|
*/
|
|
Arg verbatimStuff(std::string const & end_string,
|
|
bool allow_linebreak = true);
|
|
/*
|
|
* \returns the contents of the environment \p name.
|
|
* <tt>\begin{name}</tt> must be parsed already,
|
|
* <tt>\end{name}</tt> is parsed but not returned. The string
|
|
* is parsed with proper verbatim catcodes and one newline is
|
|
* removed from head and tail of the string if applicable.
|
|
*/
|
|
std::string const verbatimEnvironment(std::string const & end_string);
|
|
///
|
|
std::string verbatim_item();
|
|
///
|
|
std::string verbatimOption();
|
|
///
|
|
void error(std::string const & msg);
|
|
/// The previous token.
|
|
Token const prev_token() const;
|
|
/// The current token.
|
|
Token const curr_token() const;
|
|
/// The next token. Caution: If this is called, an encoding change is
|
|
/// only possible again after get_token() has been called.
|
|
Token const next_token();
|
|
/// The next but one token. Caution: If this is called, an encoding
|
|
/// change is only possible again after get_token() has been called
|
|
/// twice.
|
|
Token const next_next_token();
|
|
/// Make the next token current and return that.
|
|
Token const get_token();
|
|
/// \return whether the current token starts a new paragraph
|
|
bool isParagraph();
|
|
/// skips spaces (and comments if \p skip_comments is true)
|
|
/// \return whether whitespace was skipped (not comments)
|
|
bool skip_spaces(bool skip_comments = false);
|
|
/// puts back spaces (and comments if \p skip_comments is true)
|
|
void unskip_spaces(bool skip_comments = false);
|
|
/// Is any further input pending()? This is not like
|
|
/// std::istream::good(), which returns true if all available input
|
|
/// was read, and the next attempt to read would return EOF.
|
|
bool good();
|
|
/// resets the parser to initial state
|
|
void reset();
|
|
|
|
private:
|
|
/// Setup catcode table
|
|
void catInit();
|
|
/// Parses one token from \p is
|
|
void tokenize_one();
|
|
///
|
|
void push_back(Token const & t);
|
|
///
|
|
int lineno_;
|
|
///
|
|
std::vector<Token> tokens_;
|
|
///
|
|
size_t pos_;
|
|
///
|
|
std::vector<unsigned> positions_;
|
|
///
|
|
idocstringstream * iss_;
|
|
///
|
|
iparserdocstream is_;
|
|
/// iconv name of the current encoding
|
|
std::string encoding_iconv_;
|
|
///
|
|
CatCode theCatcode_[256];
|
|
///
|
|
cat_type theCatcodesType_;
|
|
///
|
|
cat_type curr_cat_;
|
|
///
|
|
bool fixed_enc_;
|
|
};
|
|
|
|
|
|
|
|
} // namespace lyx
|
|
|
|
#endif
|