external/bsd/atf/dist/atf-c++/detail/parser.hpp

   1 //
   2 // Automated Testing Framework (atf)
   3 //
   4 // Copyright (c) 2007 The NetBSD Foundation, Inc.
   5 // All rights reserved.
   6 //
   7 // Redistribution and use in source and binary forms, with or without
   8 // modification, are permitted provided that the following conditions
   9 // are met:
  10 // 1. Redistributions of source code must retain the above copyright
  11 //    notice, this list of conditions and the following disclaimer.
  12 // 2. Redistributions in binary form must reproduce the above copyright
  13 //    notice, this list of conditions and the following disclaimer in the
  14 //    documentation and/or other materials provided with the distribution.
  15 //
  16 // THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17 // CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20 // IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23 // GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25 // IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27 // IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29
  30 #if !defined(_ATF_CXX_PARSER_HPP_)
  31 #define _ATF_CXX_PARSER_HPP_
  32
  33 #include <istream>
  34 #include <map>
  35 #include <ostream>
  36 #include <stdexcept>
  37 #include <string>
  38 #include <utility>
  39 #include <vector>
  40
  41 namespace atf {
  42 namespace parser {
  43
  44 // ------------------------------------------------------------------------
  45 // The "parse_error" class.
  46 // ------------------------------------------------------------------------
  47
  48 class parse_error : public std::runtime_error,
  49                     public std::pair< size_t, std::string > {
  50     mutable std::string m_msg;
  51
  52 public:
  53     parse_error(size_t, std::string);
  54     ~parse_error(void) throw();
  55
  56     const char* what(void) const throw();
  57
  58     operator std::string(void) const;
  59 };
  60
  61 // ------------------------------------------------------------------------
  62 // The "parse_errors" class.
  63 // ------------------------------------------------------------------------
  64
  65 class parse_errors : public std::runtime_error,
  66                      public std::vector< parse_error > {
  67     std::vector< parse_error > m_errors;
  68     mutable std::string m_msg;
  69
  70 public:
  71     parse_errors(void);
  72     ~parse_errors(void) throw();
  73
  74     const char* what(void) const throw();
  75 };
  76
  77 // ------------------------------------------------------------------------
  78 // The "format_error" class.
  79 // ------------------------------------------------------------------------
  80
  81 class format_error : public std::runtime_error {
  82 public:
  83     format_error(const std::string&);
  84 };
  85
  86 // ------------------------------------------------------------------------
  87 // The "token" class.
  88 // ------------------------------------------------------------------------
  89
  90 typedef int token_type;
  91
  92 //!
  93 //! \brief Representation of a read token.
  94 //!
  95 //! A pair that contains the information of a token read from a stream.
  96 //! It contains the token's type and its associated data, if any.
  97 //!
  98 struct token {
  99     bool m_inited;
 100     size_t m_line;
 101     token_type m_type;
 102     std::string m_text;
 103
 104 public:
 105     token(void);
 106     token(size_t, const token_type&, const std::string& = "");
 107
 108     size_t lineno(void) const;
 109     const token_type& type(void) const;
 110     const std::string& text(void) const;
 111
 112     operator bool(void) const;
 113     bool operator!(void) const;
 114 };
 115
 116 // ------------------------------------------------------------------------
 117 // The "tokenizer" class.
 118 // ------------------------------------------------------------------------
 119
 120 //!
 121 //! \brief A stream tokenizer.
 122 //!
 123 //! This template implements an extremely simple, line-oriented stream
 124 //! tokenizer.  It is only able to recognize one character-long delimiters,
 125 //! random-length keywords, skip whitespace and, anything that does not
 126 //! match these rules is supposed to be a word.
 127 //!
 128 //! Parameter IS: The input stream's type.
 129 //!
 130 template< class IS >
 131 class tokenizer {
 132     IS& m_is;
 133     size_t m_lineno;
 134     token m_la;
 135
 136     bool m_skipws;
 137     token_type m_eof_type, m_nl_type, m_text_type;
 138
 139     std::map< char, token_type > m_delims_map;
 140     std::string m_delims_str;
 141
 142     char m_quotech;
 143     token_type m_quotetype;
 144
 145     std::map< std::string, token_type > m_keywords_map;
 146
 147     token_type alloc_type(void);
 148
 149     template< class TKZ >
 150     friend
 151     class parser;
 152
 153 public:
 154     tokenizer(IS&, bool, const token_type&, const token_type&,
 155               const token_type&, size_t = 1);
 156
 157     size_t lineno(void) const;
 158
 159     void add_delim(char, const token_type&);
 160     void add_keyword(const std::string&, const token_type&);
 161     void add_quote(char, const token_type&);
 162
 163     token next(void);
 164     std::string rest_of_line(void);
 165 };
 166
 167 template< class IS >
 168 tokenizer< IS >::tokenizer(IS& p_is,
 169                            bool p_skipws,
 170                            const token_type& p_eof_type,
 171                            const token_type& p_nl_type,
 172                            const token_type& p_text_type,
 173                            size_t p_lineno) :
 174     m_is(p_is),
 175     m_lineno(p_lineno),
 176     m_skipws(p_skipws),
 177     m_eof_type(p_eof_type),
 178     m_nl_type(p_nl_type),
 179     m_text_type(p_text_type),
 180     m_quotech(-1)
 181 {
 182 }
 183
 184 template< class IS >
 185 size_t
 186 tokenizer< IS >::lineno(void)
 187     const
 188 {
 189     return m_lineno;
 190 }
 191
 192 template< class IS >
 193 void
 194 tokenizer< IS >::add_delim(char delim, const token_type& type)
 195 {
 196     m_delims_map[delim] = type;
 197     m_delims_str += delim;
 198 }
 199
 200 template< class IS >
 201 void
 202 tokenizer< IS >::add_keyword(const std::string& keyword,
 203                              const token_type& type)
 204 {
 205     m_keywords_map[keyword] = type;
 206 }
 207
 208 template< class IS >
 209 void
 210 tokenizer< IS >::add_quote(char ch, const token_type& type)
 211 {
 212     m_quotech = ch;
 213     m_quotetype = type;
 214 }
 215
 216 template< class IS >
 217 token
 218 tokenizer< IS >::next(void)
 219 {
 220     if (m_la) {
 221         token t = m_la;
 222         m_la = token();
 223         if (t.type() == m_nl_type)
 224             m_lineno++;
 225         return t;
 226     }
 227
 228     char ch;
 229     std::string text;
 230
 231     bool done = false, quoted = false;
 232     token t(m_lineno, m_eof_type, "<<EOF>>");
 233     while (!done && m_is.get(ch).good()) {
 234         if (ch == m_quotech) {
 235             if (text.empty()) {
 236                 bool escaped = false;
 237                 while (!done && m_is.get(ch).good()) {
 238                     if (!escaped) {
 239                         if (ch == '\\')
 240                             escaped = true;
 241                         else if (ch == '\n') {
 242                             m_la = token(m_lineno, m_nl_type, "<<NEWLINE>>");
 243                             throw parse_error(t.lineno(),
 244                                               "Missing double quotes before "
 245                                               "end of line");
 246                         } else if (ch == m_quotech)
 247                             done = true;
 248                         else
 249                             text += ch;
 250                     } else {
 251                         text += ch;
 252                         escaped = false;
 253                     }
 254                 }
 255                 if (!m_is.good())
 256                     throw parse_error(t.lineno(),
 257                                       "Missing double quotes before "
 258                                       "end of file");
 259                 t = token(m_lineno, m_text_type, text);
 260                 quoted = true;
 261             } else {
 262                 m_is.putback(ch);
 263                 done = true;
 264             }
 265         } else {
 266             typename std::map< char, token_type >::const_iterator idelim;
 267             idelim = m_delims_map.find(ch);
 268             if (idelim != m_delims_map.end()) {
 269                 done = true;
 270                 if (text.empty())
 271                     t = token(m_lineno, (*idelim).second,
 272                                    std::string("") + ch);
 273                 else
 274                     m_is.putback(ch);
 275             } else if (ch == '\n') {
 276                 done = true;
 277                 if (text.empty())
 278                     t = token(m_lineno, m_nl_type, "<<NEWLINE>>");
 279                 else
 280                     m_is.putback(ch);
 281             } else if (m_skipws && (ch == ' ' || ch == '\t')) {
 282                 if (!text.empty())
 283                     done = true;
 284             } else
 285                 text += ch;
 286         }
 287     }
 288
 289     if (!quoted && !text.empty()) {
 290         typename std::map< std::string, token_type >::const_iterator ikw;
 291         ikw = m_keywords_map.find(text);
 292         if (ikw != m_keywords_map.end())
 293             t = token(m_lineno, (*ikw).second, text);
 294         else
 295             t = token(m_lineno, m_text_type, text);
 296     }
 297
 298     if (t.type() == m_nl_type)
 299         m_lineno++;
 300
 301     return t;
 302 }
 303
 304 template< class IS >
 305 std::string
 306 tokenizer< IS >::rest_of_line(void)
 307 {
 308     std::string str;
 309     while (m_is.good() && m_is.peek() != '\n')
 310         str += m_is.get();
 311     return str;
 312 }
 313
 314 // ------------------------------------------------------------------------
 315 // The "parser" class.
 316 // ------------------------------------------------------------------------
 317
 318 template< class TKZ >
 319 class parser {
 320     TKZ& m_tkz;
 321     token m_last;
 322     parse_errors m_errors;
 323     bool m_thrown;
 324
 325 public:
 326     parser(TKZ& tkz);
 327     ~parser(void);
 328
 329     bool good(void) const;
 330     void add_error(const parse_error&);
 331     bool has_errors(void) const;
 332
 333     token next(void);
 334     std::string rest_of_line(void);
 335     token reset(const token_type&);
 336
 337     token
 338     expect(const token_type&,
 339            const std::string&);
 340
 341     token
 342     expect(const token_type&,
 343            const token_type&,
 344            const std::string&);
 345
 346     token
 347     expect(const token_type&,
 348            const token_type&,
 349            const token_type&,
 350            const std::string&);
 351
 352     token
 353     expect(const token_type&,
 354            const token_type&,
 355            const token_type&,
 356            const token_type&,
 357            const std::string&);
 358
 359     token
 360     expect(const token_type&,
 361            const token_type&,
 362            const token_type&,
 363            const token_type&,
 364            const token_type&,
 365            const token_type&,
 366            const token_type&,
 367            const std::string&);
 368
 369     token
 370     expect(const token_type&,
 371            const token_type&,
 372            const token_type&,
 373            const token_type&,
 374            const token_type&,
 375            const token_type&,
 376            const token_type&,
 377            const token_type&,
 378            const std::string&);
 379 };
 380
 381 template< class TKZ >
 382 parser< TKZ >::parser(TKZ& tkz) :
 383     m_tkz(tkz),
 384     m_thrown(false)
 385 {
 386 }
 387
 388 template< class TKZ >
 389 parser< TKZ >::~parser(void)
 390 {
 391     if (!m_errors.empty() && !m_thrown)
 392         throw m_errors;
 393 }
 394
 395 template< class TKZ >
 396 bool
 397 parser< TKZ >::good(void)
 398     const
 399 {
 400     return m_tkz.m_is.good();
 401 }
 402
 403 template< class TKZ >
 404 void
 405 parser< TKZ >::add_error(const parse_error& pe)
 406 {
 407     m_errors.push_back(pe);
 408 }
 409
 410 template< class TKZ >
 411 bool
 412 parser< TKZ >::has_errors(void)
 413     const
 414 {
 415     return !m_errors.empty();
 416 }
 417
 418 template< class TKZ >
 419 token
 420 parser< TKZ >::next(void)
 421 {
 422     token t = m_tkz.next();
 423
 424     m_last = t;
 425
 426     if (t.type() == m_tkz.m_eof_type) {
 427         if (!m_errors.empty()) {
 428             m_thrown = true;
 429             throw m_errors;
 430         }
 431     }
 432
 433     return t;
 434 }
 435
 436 template< class TKZ >
 437 std::string
 438 parser< TKZ >::rest_of_line(void)
 439 {
 440     return m_tkz.rest_of_line();
 441 }
 442
 443 template< class TKZ >
 444 token
 445 parser< TKZ >::reset(const token_type& stop)
 446 {
 447     token t = m_last;
 448
 449     while (t.type() != m_tkz.m_eof_type && t.type() != stop)
 450         t = next();
 451
 452     return t;
 453 }
 454
 455 template< class TKZ >
 456 token
 457 parser< TKZ >::expect(const token_type& t1,
 458                       const std::string& textual)
 459 {
 460     token t = next();
 461
 462     if (t.type() != t1)
 463         throw parse_error(t.lineno(),
 464                           "Unexpected token `" + t.text() +
 465                           "'; expected " + textual);
 466
 467     return t;
 468 }
 469
 470 template< class TKZ >
 471 token
 472 parser< TKZ >::expect(const token_type& t1,
 473                       const token_type& t2,
 474                       const std::string& textual)
 475 {
 476     token t = next();
 477
 478     if (t.type() != t1 && t.type() != t2)
 479         throw parse_error(t.lineno(),
 480                           "Unexpected token `" + t.text() +
 481                           "'; expected " + textual);
 482
 483     return t;
 484 }
 485
 486 template< class TKZ >
 487 token
 488 parser< TKZ >::expect(const token_type& t1,
 489                       const token_type& t2,
 490                       const token_type& t3,
 491                       const std::string& textual)
 492 {
 493     token t = next();
 494
 495     if (t.type() != t1 && t.type() != t2 && t.type() != t3)
 496         throw parse_error(t.lineno(),
 497                           "Unexpected token `" + t.text() +
 498                           "'; expected " + textual);
 499
 500     return t;
 501 }
 502
 503 template< class TKZ >
 504 token
 505 parser< TKZ >::expect(const token_type& t1,
 506                       const token_type& t2,
 507                       const token_type& t3,
 508                       const token_type& t4,
 509                       const std::string& textual)
 510 {
 511     token t = next();
 512
 513     if (t.type() != t1 && t.type() != t2 && t.type() != t3 &&
 514         t.type() != t4)
 515         throw parse_error(t.lineno(),
 516                           "Unexpected token `" + t.text() +
 517                           "'; expected " + textual);
 518
 519     return t;
 520 }
 521
 522 template< class TKZ >
 523 token
 524 parser< TKZ >::expect(const token_type& t1,
 525                       const token_type& t2,
 526                       const token_type& t3,
 527                       const token_type& t4,
 528                       const token_type& t5,
 529                       const token_type& t6,
 530                       const token_type& t7,
 531                       const std::string& textual)
 532 {
 533     token t = next();
 534
 535     if (t.type() != t1 && t.type() != t2 && t.type() != t3 &&
 536         t.type() != t4 && t.type() != t5 && t.type() != t6 &&
 537         t.type() != t7)
 538         throw parse_error(t.lineno(),
 539                           "Unexpected token `" + t.text() +
 540                           "'; expected " + textual);
 541
 542     return t;
 543 }
 544
 545 template< class TKZ >
 546 token
 547 parser< TKZ >::expect(const token_type& t1,
 548                       const token_type& t2,
 549                       const token_type& t3,
 550                       const token_type& t4,
 551                       const token_type& t5,
 552                       const token_type& t6,
 553                       const token_type& t7,
 554                       const token_type& t8,
 555                       const std::string& textual)
 556 {
 557     token t = next();
 558
 559     if (t.type() != t1 && t.type() != t2 && t.type() != t3 &&
 560         t.type() != t4 && t.type() != t5 && t.type() != t6 &&
 561         t.type() != t7 && t.type() != t8)
 562         throw parse_error(t.lineno(),
 563                           "Unexpected token `" + t.text() +
 564                           "'; expected " + textual);
 565
 566     return t;
 567 }
 568
 569 #define ATF_PARSER_CALLBACK(parser, func) \
 570     do { \
 571         if (!(parser).has_errors()) \
 572             func; \
 573     } while (false)
 574
 575 // ------------------------------------------------------------------------
 576 // Header parsing.
 577 // ------------------------------------------------------------------------
 578
 579 typedef std::map< std::string, std::string > attrs_map;
 580
 581 class header_entry {
 582     std::string m_name;
 583     std::string m_value;
 584     attrs_map m_attrs;
 585
 586 public:
 587     header_entry(void);
 588     header_entry(const std::string&, const std::string&,
 589                  attrs_map = attrs_map());
 590
 591     const std::string& name(void) const;
 592     const std::string& value(void) const;
 593     const attrs_map& attrs(void) const;
 594     bool has_attr(const std::string&) const;
 595     const std::string& get_attr(const std::string&) const;
 596 };
 597
 598 typedef std::map< std::string, header_entry > headers_map;
 599
 600 std::pair< size_t, headers_map > read_headers(std::istream&, size_t);
 601 void write_headers(const headers_map&, std::ostream&);
 602 void validate_content_type(const headers_map&, const std::string&, int);
 603
 604 } // namespace parser
 605 } // namespace atf
 606
 607 #endif // !defined(_ATF_CXX_PARSER_HPP_)