4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
9 * Full author contact details are available in file CREDITS.
19 #include "support/docstream.h"
24 enum mode_type {UNDECIDED_MODE, TEXT_MODE, MATH_MODE, MATHTEXT_MODE, TABLE_MODE};
26 mode_type asMode(mode_type oldmode, std::string const & str);
29 // These are TeX's catcodes
31 catEscape, // 0 backslash
42 catLetter, // 11 a-zA-Z
43 catOther, // 12 none of the above
46 catInvalid // 15 <delete>
57 FLAG_BRACE_LAST = 1 << 1, // last closing brace ends the parsing
58 FLAG_RIGHT = 1 << 2, // next \\right ends the parsing process
59 FLAG_END = 1 << 3, // next \\end ends the parsing process
60 FLAG_BRACK_LAST = 1 << 4, // next closing bracket ends the parsing
61 FLAG_TEXTMODE = 1 << 5, // we are in a box
62 FLAG_ITEM = 1 << 6, // read a (possibly braced token)
63 FLAG_LEAVE = 1 << 7, // leave the loop at the end
64 FLAG_SIMPLE = 1 << 8, // next $ leaves the loop
65 FLAG_EQUATION = 1 << 9, // next \] leaves the loop
66 FLAG_SIMPLE2 = 1 << 10, // next \) leaves the loop
67 FLAG_OPTION = 1 << 11, // read [...] style option
68 FLAG_BRACED = 1 << 12, // read {...} style argument
69 FLAG_CELL = 1 << 13, // read table cell
70 FLAG_TABBING = 1 << 14 // We are inside a tabbing environment
76 // Helper class for parsing
82 Token() : cs_(), cat_(catIgnore) {}
84 Token(docstring const & cs, CatCode cat) : cs_(to_utf8(cs)), cat_(cat) {}
86 /// Returns the token as string
87 std::string const & cs() const { return cs_; }
88 /// Returns the catcode of the token
89 CatCode cat() const { return cat_; }
90 /** Get the character of tokens that were constructed from a single
91 * character input or a two character input and cat_ == catEscape.
92 * FIXME: The intended usage is not clear. The Token class in
93 * ../mathed/MathParser.cpp (which is the anchestor of this
94 * class) uses a separate char member for this method. I
95 * believe that the intended usage is to not cover tokens with
96 * catEscape or catComment, e.g. \code
97 * return (cs_.empty() || cat_ == catEscape || cat_ == catComment) ? 0 : cs_[0];
99 * All usages of this method should be checked. gb 2011-01-05
101 char character() const { return cs_.empty() ? 0 : cs_[0]; }
102 /// Returns the token verbatim
103 std::string asInput() const;
104 /// Is the token an alphanumerical character?
105 bool isAlnumASCII() const;
114 std::ostream & operator<<(std::ostream & os, Token const & t);
117 extern void debugToken(std::ostream & os, Token const & t, unsigned int flags);
120 /// A docstream version that supports putback even when not buffered
121 class iparserdocstream
124 typedef idocstream::int_type int_type;
126 iparserdocstream(idocstream & is) : is_(is) {}
129 /// Like std::istream::operator bool()
130 /// Do not convert is_ implicitly to bool, since that is forbidden in C++11.
131 explicit operator bool() const { return s_.empty() ? !is_.fail() : true; }
133 /// Like std::istream::operator void*()
134 operator void*() const { return (s_.empty() && is_.fail()) ?
135 0 : const_cast<iparserdocstream *>(this); }
138 /// change the encoding of the input stream to \p e (iconv name)
139 void setEncoding(std::string const & e);
141 // add to the list of characters to read before actually reading
143 void putback(char_type c);
145 // add to the list of characters to read before actually reading
147 void putback(docstring s);
149 /// Like std::istream::get()
150 iparserdocstream & get(char_type &c);
152 /// Like std::istream::good()
153 bool good() const { return s_.empty() ? is_.good() : true; }
155 /// Like std::istream::peek()
156 int_type peek() const { return s_.empty() ? is_.peek() : s_[0]; }
160 /// characters to read before actually reading the stream
166 * Actual parser class
168 * The parser parses every character of the inputstream into a token
169 * and classifies the token.
170 * The following transformations are done:
171 * - Consecutive spaces are combined into one single token with CatCode catSpace
172 * - Consecutive newlines are combined into one single token with CatCode catNewline
173 * - Comments and %\n combinations are parsed into one token with CatCode catComment
178 Parser(Parser const & p);
179 Parser & operator=(Parser const & p);
182 Parser(idocstream & is, std::string const & fixedenc);
184 Parser(std::string const & s);
188 /** forget already parsed next tokens and put the
189 * corresponding characters into the input stream for
190 * re-reading. Useful when changing catcodes. */
193 /// change the encoding of the input stream according to \p encoding
194 /// (latex name) and package \p package
195 bool setEncoding(std::string const & encoding, int const & package);
196 /// change the encoding of the input stream to \p encoding (iconv name)
197 bool setEncoding(std::string const & encoding);
198 /// get the current iconv encoding of the input stream
199 std::string getEncoding() const { return encoding_iconv_; }
202 CatCode catcode(char_type c) const;
204 void setCatcode(char c, CatCode cat);
205 /// set parser to normal or verbatim mode
206 void setCatcodes(cat_type t);
209 int lineno() const { return lineno_; }
212 /// store current position
214 /// restore previous position
216 /// forget last saved position
218 /// dump contents to screen
221 /// Does an optional argument follow after the current token?
224 typedef std::pair<bool, std::string> Arg;
226 * Get an argument enclosed by \p left and \p right.
227 * If \p allow_escaping is true, a right delimiter escaped by a
228 * backslash does not count as delimiter, but is included in the
230 * \returns wether an argument was found in \p Arg.first and the
231 * argument in \p Arg.second. \see getArg().
233 Arg getFullArg(char left, char right, bool allow_escaping = true);
235 * Get an argument enclosed by \p left and \p right.
236 * If \p allow_escaping is true, a right delimiter escaped by a
237 * backslash does not count as delimiter, but is included in the
239 * \returns the argument (without \p left and \p right) or the empty
240 * string if the next non-space token is not \p left. Use
241 * getFullArg() if you need to know wether there was an empty
242 * argument or no argument at all.
244 std::string getArg(char left, char right, bool allow_escaping = true);
246 * Like getOpt(), but distinguishes between a missing argument ""
247 * and an empty argument "[]".
249 std::string getFullOpt(bool keepws = false);
251 * \returns getArg('[', ']') including the brackets or the
252 * empty string if there is no such argument.
253 * No whitespace is eaten if \p keepws is true and no optional
254 * argument exists. This is important if an optional argument is
255 * parsed that would go after a command in ERT: In this case the
256 * whitespace is needed to separate the ERT from the subsequent
257 * word. Without it, the ERT and the next word would be concatenated
258 * during .tex export, thus creating an invalid command.
260 std::string getOpt(bool keepws = false);
262 * \returns getFullArg('(', ')') including the parentheses or the
263 * empty string if there is no such argument.
265 std::string getFullParentheseArg();
267 * \returns the contents of the environment \p name.
268 * <tt>\begin{name}</tt> must be parsed already, <tt>\end{name}</tt>
269 * is parsed but not returned. This parses nested environments properly.
271 std::string const ertEnvironment(std::string const & name);
273 * The same as ertEnvironment(std::string const & name) but
274 * \begin and \end commands inside the name environment are not parsed.
275 * This function is designed to parse verbatim environments.
277 std::string const plainEnvironment(std::string const & name);
279 * Basically the same as plainEnvironment(std::string const & name) but
280 * instead of \begin and \end commands the parsing is started/stopped
281 * at given characters.
282 * This function is designed to parse verbatim commands.
284 std::string const plainCommand(char left, char right, std::string const & name);
286 * Basically the same as plainEnvironment() but the parsing is
287 * stopped at string \p end_string. Contrary to the other
288 * methods, this uses proper catcode setting. This function is
289 * designed to parse verbatim environments and command. The
290 * intention is to eventually replace all of its siblings. the
291 * member \p first of the result tells whether the arg was
292 * found and the member \p second is the value. If \p
293 * allow_linebreak is false, then the parsing is limited to one line
295 Arg verbatimStuff(std::string const & end_string,
296 bool allow_linebreak = true);
298 * \returns the contents of the environment \p name.
299 * <tt>\begin{name}</tt> must be parsed already,
300 * <tt>\end{name}</tt> is parsed but not returned. The string
301 * is parsed with proper verbatim catcodes and one newline is
302 * removed from head and tail of the string if applicable.
304 std::string const verbatimEnvironment(std::string const & end_string);
306 std::string verbatim_item();
308 std::string verbatimOption();
310 void error(std::string const & msg);
311 /// The previous token.
312 Token const prev_token() const;
313 /// The current token.
314 Token const curr_token() const;
315 /// The next token. Caution: If this is called, an encoding change is
316 /// only possible again after get_token() has been called.
317 Token const next_token();
318 /// The next but one token. Caution: If this is called, an encoding
319 /// change is only possible again after get_token() has been called
321 Token const next_next_token();
322 /// Make the next token current and return that.
323 Token const get_token();
324 /// \return whether the current token starts a new paragraph
326 /// skips spaces (and comments if \p skip_comments is true)
327 /// \return whether whitespace was skipped (not comments)
328 bool skip_spaces(bool skip_comments = false);
329 /// puts back spaces (and comments if \p skip_comments is true)
330 void unskip_spaces(bool skip_comments = false);
331 /// Is any further input pending()? This is not like
332 /// std::istream::good(), which returns true if all available input
333 /// was read, and the next attempt to read would return EOF.
335 /// resets the parser to initial state
339 /// Setup catcode table
341 /// Parses one token from \p is
344 void push_back(Token const & t);
348 std::vector<Token> tokens_;
352 std::vector<unsigned> positions_;
354 idocstringstream * iss_;
356 iparserdocstream is_;
357 /// iconv name of the current encoding
358 std::string encoding_iconv_;
360 CatCode theCatcode_[256];
362 cat_type theCatcodesType_;