Head

GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/main/interactive_shell.cpp	Lines:	57	85	67.1 %
Date:	2021-09-29	Branches:	103	291	35.4 %


/******************************************************************************
 * Top contributors (to current version):
 *   Morgan Deters, Christopher L. Conway, Andrew V. Jones
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * Interactive shell for cvc5.
 *
 * This file is the implementation for the cvc5 interactive shell.
 * The shell supports the editline library.
 */
#include "main/interactive_shell.h"

#include <cstring>
#include <unistd.h>

#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <set>
#include <string>
#include <utility>
#include <vector>

// This must go before HAVE_LIBEDITLINE.
#include "base/cvc5config.h"

#if HAVE_LIBEDITLINE
#include <editline/readline.h>
#  if HAVE_EXT_STDIO_FILEBUF_H
#    include <ext/stdio_filebuf.h>
#  endif /* HAVE_EXT_STDIO_FILEBUF_H */
#endif   /* HAVE_LIBEDITLINE */

#include "api/cpp/cvc5.h"
#include "base/check.h"
#include "base/output.h"
#include "expr/symbol_manager.h"
#include "parser/input.h"
#include "parser/parser.h"
#include "parser/parser_builder.h"
#include "smt/command.h"
#include "theory/logic_info.h"

using namespace std;

namespace cvc5 {

using namespace parser;
using namespace language;

const string InteractiveShell::INPUT_FILENAME = "<shell>";

#if HAVE_LIBEDITLINE

#if HAVE_EXT_STDIO_FILEBUF_H
using __gnu_cxx::stdio_filebuf;
#endif /* HAVE_EXT_STDIO_FILEBUF_H */

char** commandCompletion(const char* text, int start, int end);
char* commandGenerator(const char* text, int state);

static const std::string smt2_commands[] = {
#include "main/smt2_tokens.h"
};/* smt2_commands */

static const std::string tptp_commands[] = {
#include "main/tptp_tokens.h"
};/* tptp_commands */

static const std::string* commandsBegin;
static const std::string* commandsEnd;

static set<string> s_declarations;

#endif /* HAVE_LIBEDITLINE */

InteractiveShell::InteractiveShell(api::Solver* solver,
                                   SymbolManager* sm,
                                   std::istream& in,
                                   std::ostream& out)
    : d_solver(solver), d_in(in), d_out(out), d_quit(false)
{
  ParserBuilder parserBuilder(solver, sm, true);
  /* Create parser with bogus input. */
  d_parser = parserBuilder.build();
  if (d_solver->getOptionInfo("force-logic").setByUser)
  {
    LogicInfo tmp(d_solver->getOption("force-logic"));
    d_parser->forceLogic(tmp.getLogicString());
  }

#if HAVE_LIBEDITLINE
  if (&d_in == &std::cin && isatty(fileno(stdin)))
  {
    ::rl_readline_name = const_cast<char*>("cvc5");
#if EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP
    ::rl_completion_entry_function = commandGenerator;
#else /* EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP */
    ::rl_completion_entry_function = (int (*)(const char*, int)) commandGenerator;
#endif /* EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP */
    ::using_history();

    std::string lang = solver->getOption("input-language");
    if (lang == "LANG_TPTP")
    {
      d_historyFilename = string(getenv("HOME")) + "/.cvc5_history_tptp";
      commandsBegin = tptp_commands;
      commandsEnd =
          tptp_commands + sizeof(tptp_commands) / sizeof(*tptp_commands);
    }
    else if (lang == "LANG_SMTLIB_V2_6")
    {
      d_historyFilename = string(getenv("HOME")) + "/.cvc5_history_smtlib2";
      commandsBegin = smt2_commands;
      commandsEnd =
          smt2_commands + sizeof(smt2_commands) / sizeof(*smt2_commands);
    }
    else
    {
      throw Exception("internal error: unhandled language " + lang);
    }
    d_usingEditline = true;
    int err = ::read_history(d_historyFilename.c_str());
    ::stifle_history(s_historyLimit);
    if(Notice.isOn()) {
      if(err == 0) {
        Notice() << "Read " << ::history_length << " lines of history from "
                 << d_historyFilename << std::endl;
      } else {
        Notice() << "Could not read history from " << d_historyFilename
                 << ": " << strerror(err) << std::endl;
      }
    }
  }
  else
  {
    d_usingEditline = false;
  }
#else  /* HAVE_LIBEDITLINE */
  d_usingEditline = false;
#endif /* HAVE_LIBEDITLINE */
}/* InteractiveShell::InteractiveShell() */

InteractiveShell::~InteractiveShell() {
#if HAVE_LIBEDITLINE
  int err = ::write_history(d_historyFilename.c_str());
  if(err == 0) {
    Notice() << "Wrote " << ::history_length << " lines of history to "
             << d_historyFilename << std::endl;
  } else {
    Notice() << "Could not write history to " << d_historyFilename
             << ": " << strerror(err) << std::endl;
  }
#endif /* HAVE_LIBEDITLINE */
  delete d_parser;
}

Command* InteractiveShell::readCommand()
{
  char* lineBuf = NULL;
  string line = "";

restart:

  /* Don't do anything if the input is closed or if we've seen a
   * QuitCommand. */
  if(d_in.eof() || d_quit) {
    d_out << endl;
    return NULL;
  }

  /* If something's wrong with the input, there's nothing we can do. */
  if( !d_in.good() ) {
    throw ParserException("Interactive input broken.");
  }

  /* Prompt the user for input. */
  if (d_usingEditline)
  {
#if HAVE_LIBEDITLINE
    lineBuf = ::readline(line == "" ? "cvc5> " : "... > ");
    if(lineBuf != NULL && lineBuf[0] != '\0') {
      ::add_history(lineBuf);
    }
    line += lineBuf == NULL ? "" : lineBuf;
    free(lineBuf);
#endif /* HAVE_LIBEDITLINE */
  }
  else
  {
    if (line == "")
    {
      d_out << "cvc5> " << flush;
    }
    else
    {
      d_out << "... > " << flush;
    }

    /* Read a line */
    stringbuf sb;
    d_in.get(sb);
    line += sb.str();
  }

  string input = "";
  while(true) {
    Debug("interactive") << "Input now '" << input << line << "'" << endl
                         << flush;

    Assert(!(d_in.fail() && !d_in.eof()) || line.empty());

    /* Check for failure. */
    if(d_in.fail() && !d_in.eof()) {
      /* This should only happen if the input line was empty. */
      Assert(line.empty());
      d_in.clear();
    }

    /* Strip trailing whitespace. */
    int n = line.length() - 1;
    while( !line.empty() && isspace(line[n]) ) {
      line.erase(n,1);
      n--;
    }

    /* If we hit EOF, we're done. */
    if ((!d_usingEditline && d_in.eof())
        || (d_usingEditline && lineBuf == NULL))
    {
      input += line;

      if(input.empty()) {
        /* Nothing left to parse. */
        d_out << endl;
        return NULL;
      }

      /* Some input left to parse, but nothing left to read.
         Jump out of input loop. */
      d_out << endl;
      input = line = "";
      d_in.clear();
      goto restart;
    }

    if (!d_usingEditline)
    {
      /* Extract the newline delimiter from the stream too */
      int c CVC5_UNUSED = d_in.get();
      Assert(c == '\n');
      Debug("interactive") << "Next char is '" << (char)c << "'" << endl
                           << flush;
    }

    input += line;

    /* If the last char was a backslash, continue on the next line. */
    n = input.length() - 1;
    if( !line.empty() && input[n] == '\\' ) {
      input[n] = '\n';
      if (d_usingEditline)
      {
#if HAVE_LIBEDITLINE
        lineBuf = ::readline("... > ");
        if(lineBuf != NULL && lineBuf[0] != '\0') {
          ::add_history(lineBuf);
        }
        line = lineBuf == NULL ? "" : lineBuf;
        free(lineBuf);
#endif /* HAVE_LIBEDITLINE */
      }
      else
      {
        d_out << "... > " << flush;

        /* Read a line */
        stringbuf sb;
        d_in.get(sb);
        line = sb.str();
      }
    } else {
      /* No continuation, we're done. */
      Debug("interactive") << "Leaving input loop." << endl << flush;
      break;
    }
  }

  d_parser->setInput(Input::newStringInput(
      d_solver->getOption("input-language"), input, INPUT_FILENAME));

  /* There may be more than one command in the input. Build up a
     sequence. */
  CommandSequence *cmd_seq = new CommandSequence();
  Command *cmd;

  try
  {
    while ((cmd = d_parser->nextCommand()))
    {
      cmd_seq->addCommand(cmd);
      if (dynamic_cast<QuitCommand*>(cmd) != NULL)
      {
        d_quit = true;
        break;
      }
      else
      {
#if HAVE_LIBEDITLINE
        if (dynamic_cast<DeclareFunctionCommand*>(cmd) != NULL)
        {
          s_declarations.insert(
              dynamic_cast<DeclareFunctionCommand*>(cmd)->getSymbol());
        }
        else if (dynamic_cast<DefineFunctionCommand*>(cmd) != NULL)
        {
          s_declarations.insert(
              dynamic_cast<DefineFunctionCommand*>(cmd)->getSymbol());
        }
        else if (dynamic_cast<DeclareSortCommand*>(cmd) != NULL)
        {
          s_declarations.insert(
              dynamic_cast<DeclareSortCommand*>(cmd)->getSymbol());
        }
        else if (dynamic_cast<DefineSortCommand*>(cmd) != NULL)
        {
          s_declarations.insert(
              dynamic_cast<DefineSortCommand*>(cmd)->getSymbol());
        }
#endif /* HAVE_LIBEDITLINE */
      }
    }
  }
  catch (ParserEndOfFileException& pe)
  {
    line += "\n";
    goto restart;
  }
  catch (ParserException& pe)
  {
    if (d_solver->getOption("output-language") == "LANG_SMTLIB_V2_6")
    {
      d_out << "(error \"" << pe << "\")" << endl;
    }
    else
    {
      d_out << pe << endl;
    }
    // We can't really clear out the sequence and abort the current line,
    // because the parse error might be for the second command on the
    // line.  The first ones haven't yet been executed by the SmtEngine,
    // but the parser state has already made the variables and the mappings
    // in the symbol table.  So unfortunately, either we exit cvc5 entirely,
    // or we commit to the current line up to the command with the parse
    // error.
    //
    // FIXME: does that mean e.g. that a pushed LET scope might not yet have
    // been popped?!
    //
    // delete cmd_seq;
    // cmd_seq = new CommandSequence();
  }

  return cmd_seq;
}/* InteractiveShell::readCommand() */

#if HAVE_LIBEDITLINE

char** commandCompletion(const char* text, int start, int end) {
  Debug("rl") << "text: " << text << endl;
  Debug("rl") << "start: " << start << " end: " << end << endl;
  return rl_completion_matches(text, commandGenerator);
}

// Our peculiar versions of "less than" for strings
struct StringPrefix1Less {
  bool operator()(const std::string& s1, const std::string& s2) {
    size_t l1 = s1.length(), l2 = s2.length();
    size_t l = l1 <= l2 ? l1 : l2;
    return s1.compare(0, l1, s2, 0, l) < 0;
  }
};/* struct StringPrefix1Less */
struct StringPrefix2Less {
  bool operator()(const std::string& s1, const std::string& s2) {
    size_t l1 = s1.length(), l2 = s2.length();
    size_t l = l1 <= l2 ? l1 : l2;
    return s1.compare(0, l, s2, 0, l2) < 0;
  }
};/* struct StringPrefix2Less */

char* commandGenerator(const char* text, int state) {
  static thread_local const std::string* rlCommand;
  static thread_local set<string>::const_iterator* rlDeclaration;

  const std::string* i = lower_bound(commandsBegin, commandsEnd, text, StringPrefix2Less());
  const std::string* j = upper_bound(commandsBegin, commandsEnd, text, StringPrefix1Less());

  set<string>::const_iterator ii = lower_bound(s_declarations.begin(), s_declarations.end(), text, StringPrefix2Less());
  set<string>::const_iterator jj = upper_bound(s_declarations.begin(), s_declarations.end(), text, StringPrefix1Less());

  if(rlDeclaration == NULL) {
    rlDeclaration = new set<string>::const_iterator();
  }

  if(state == 0) {
    rlCommand = i;
    *rlDeclaration = ii;
  }

  if(rlCommand != j) {
    return strdup((*rlCommand++).c_str());
  }

  return *rlDeclaration == jj ? NULL : strdup((*(*rlDeclaration)++).c_str());
}

#endif /* HAVE_LIBEDITLINE */

}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Morgan Deters, Christopher L. Conway, Andrew V. Jones
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* Interactive shell for cvc5.
14		*
15		* This file is the implementation for the cvc5 interactive shell.
16		* The shell supports the editline library.
17		*/
18		#include "main/interactive_shell.h"
19
20		#include <cstring>
21		#include <unistd.h>
22
23		#include <algorithm>
24		#include <cstdlib>
25		#include <iostream>
26		#include <set>
27		#include <string>
28		#include <utility>
29		#include <vector>
30
31		// This must go before HAVE_LIBEDITLINE.
32		#include "base/cvc5config.h"
33
34		#if HAVE_LIBEDITLINE
35		#include <editline/readline.h>
36		# if HAVE_EXT_STDIO_FILEBUF_H
37		# include <ext/stdio_filebuf.h>
38		# endif /* HAVE_EXT_STDIO_FILEBUF_H */
39		#endif /* HAVE_LIBEDITLINE */
40
41		#include "api/cpp/cvc5.h"
42		#include "base/check.h"
43		#include "base/output.h"
44		#include "expr/symbol_manager.h"
45		#include "parser/input.h"
46		#include "parser/parser.h"
47		#include "parser/parser_builder.h"
48		#include "smt/command.h"
49		#include "theory/logic_info.h"
50
51		using namespace std;
52
53		namespace cvc5 {
54
55		using namespace parser;
56		using namespace language;
57
58	7575	const string InteractiveShell::INPUT_FILENAME = "<shell>";
59
60		#if HAVE_LIBEDITLINE
61
62		#if HAVE_EXT_STDIO_FILEBUF_H
63		using __gnu_cxx::stdio_filebuf;
64		#endif /* HAVE_EXT_STDIO_FILEBUF_H */
65
66		char** commandCompletion(const char* text, int start, int end);
67		char* commandGenerator(const char* text, int state);
68
69		static const std::string smt2_commands[] = {
70		#include "main/smt2_tokens.h"
71		};/* smt2_commands */
72
73		static const std::string tptp_commands[] = {
74		#include "main/tptp_tokens.h"
75		};/* tptp_commands */
76
77		static const std::string* commandsBegin;
78		static const std::string* commandsEnd;
79
80		static set<string> s_declarations;
81
82		#endif /* HAVE_LIBEDITLINE */
83
84	12	InteractiveShell::InteractiveShell(api::Solver* solver,
85		SymbolManager* sm,
86		std::istream& in,
87	12	std::ostream& out)
88	12	: d_solver(solver), d_in(in), d_out(out), d_quit(false)
89		{
90	24	ParserBuilder parserBuilder(solver, sm, true);
91		/* Create parser with bogus input. */
92	12	d_parser = parserBuilder.build();
93	12	if (d_solver->getOptionInfo("force-logic").setByUser)
94		{
95		LogicInfo tmp(d_solver->getOption("force-logic"));
96		d_parser->forceLogic(tmp.getLogicString());
97		}
98
99		#if HAVE_LIBEDITLINE
100		if (&d_in == &std::cin && isatty(fileno(stdin)))
101		{
102		::rl_readline_name = const_cast<char*>("cvc5");
103		#if EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP
104		::rl_completion_entry_function = commandGenerator;
105		#else /* EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP */
106		::rl_completion_entry_function = (int ()(const char, int)) commandGenerator;
107		#endif /* EDITLINE_COMPENTRY_FUNC_RETURNS_CHARP */
108		::using_history();
109
110		std::string lang = solver->getOption("input-language");
111		if (lang == "LANG_TPTP")
112		{
113		d_historyFilename = string(getenv("HOME")) + "/.cvc5_history_tptp";
114		commandsBegin = tptp_commands;
115		commandsEnd =
116		tptp_commands + sizeof(tptp_commands) / sizeof(*tptp_commands);
117		}
118		else if (lang == "LANG_SMTLIB_V2_6")
119		{
120		d_historyFilename = string(getenv("HOME")) + "/.cvc5_history_smtlib2";
121		commandsBegin = smt2_commands;
122		commandsEnd =
123		smt2_commands + sizeof(smt2_commands) / sizeof(*smt2_commands);
124		}
125		else
126		{
127		throw Exception("internal error: unhandled language " + lang);
128		}
129		d_usingEditline = true;
130		int err = ::read_history(d_historyFilename.c_str());
131		::stifle_history(s_historyLimit);
132		if(Notice.isOn()) {
133		if(err == 0) {
134		Notice() << "Read " << ::history_length << " lines of history from "
135		<< d_historyFilename << std::endl;
136		} else {
137		Notice() << "Could not read history from " << d_historyFilename
138		<< ": " << strerror(err) << std::endl;
139		}
140		}
141		}
142		else
143		{
144		d_usingEditline = false;
145		}
146		#else /* HAVE_LIBEDITLINE */
147	12	d_usingEditline = false;
148		#endif /* HAVE_LIBEDITLINE */
149	12	}/* InteractiveShell::InteractiveShell() */
150
151	24	InteractiveShell::~InteractiveShell() {
152		#if HAVE_LIBEDITLINE
153		int err = ::write_history(d_historyFilename.c_str());
154		if(err == 0) {
155		Notice() << "Wrote " << ::history_length << " lines of history to "
156		<< d_historyFilename << std::endl;
157		} else {
158		Notice() << "Could not write history to " << d_historyFilename
159		<< ": " << strerror(err) << std::endl;
160		}
161		#endif /* HAVE_LIBEDITLINE */
162	12	delete d_parser;
163	12	}
164
165	28	Command* InteractiveShell::readCommand()
166		{
167	28	char* lineBuf = NULL;
168	56	string line = "";
169
170	28	restart:
171
172		/* Don't do anything if the input is closed or if we've seen a
173		* QuitCommand. */
174	28	if(d_in.eof() \|\| d_quit) {
175		d_out << endl;
176		return NULL;
177		}
178
179		/* If something's wrong with the input, there's nothing we can do. */
180	28	if( !d_in.good() ) {
181		throw ParserException("Interactive input broken.");
182		}
183
184		/* Prompt the user for input. */
185	28	if (d_usingEditline)
186		{
187		#if HAVE_LIBEDITLINE
188		lineBuf = ::readline(line == "" ? "cvc5> " : "... > ");
189		if(lineBuf != NULL && lineBuf[0] != '\0') {
190		::add_history(lineBuf);
191		}
192		line += lineBuf == NULL ? "" : lineBuf;
193		free(lineBuf);
194		#endif /* HAVE_LIBEDITLINE */
195		}
196		else
197		{
198	28	if (line == "")
199		{
200	28	d_out << "cvc5> " << flush;
201		}
202		else
203		{
204		d_out << "... > " << flush;
205		}
206
207		/* Read a line */
208	56	stringbuf sb;
209	28	d_in.get(sb);
210	28	line += sb.str();
211		}
212
213	28	string input = "";
214		while(true) {
215	56	Debug("interactive") << "Input now '" << input << line << "'" << endl
216	28	<< flush;
217
218	28	Assert(!(d_in.fail() && !d_in.eof()) \|\| line.empty());
219
220		/* Check for failure. */
221	28	if(d_in.fail() && !d_in.eof()) {
222		/* This should only happen if the input line was empty. */
223	6	Assert(line.empty());
224	6	d_in.clear();
225		}
226
227		/* Strip trailing whitespace. */
228	28	int n = line.length() - 1;
229	28	while( !line.empty() && isspace(line[n]) ) {
230		line.erase(n,1);
231		n--;
232		}
233
234		/* If we hit EOF, we're done. */
235	84	if ((!d_usingEditline && d_in.eof())
236	44	\|\| (d_usingEditline && lineBuf == NULL))
237		{
238	12	input += line;
239
240	12	if(input.empty()) {
241		/* Nothing left to parse. */
242	12	d_out << endl;
243	12	return NULL;
244		}
245
246		/* Some input left to parse, but nothing left to read.
247		Jump out of input loop. */
248		d_out << endl;
249		input = line = "";
250		d_in.clear();
251		goto restart;
252		}
253
254	16	if (!d_usingEditline)
255		{
256		/* Extract the newline delimiter from the stream too */
257	16	int c CVC5_UNUSED = d_in.get();
258	16	Assert(c == '\n');
259	32	Debug("interactive") << "Next char is '" << (char)c << "'" << endl
260	16	<< flush;
261		}
262
263	16	input += line;
264
265		/* If the last char was a backslash, continue on the next line. */
266	16	n = input.length() - 1;
267	16	if( !line.empty() && input[n] == '\\' ) {
268		input[n] = '\n';
269		if (d_usingEditline)
270		{
271		#if HAVE_LIBEDITLINE
272		lineBuf = ::readline("... > ");
273		if(lineBuf != NULL && lineBuf[0] != '\0') {
274		::add_history(lineBuf);
275		}
276		line = lineBuf == NULL ? "" : lineBuf;
277		free(lineBuf);
278		#endif /* HAVE_LIBEDITLINE */
279		}
280		else
281		{
282		d_out << "... > " << flush;
283
284		/* Read a line */
285		stringbuf sb;
286		d_in.get(sb);
287		line = sb.str();
288		}
289		} else {
290		/* No continuation, we're done. */
291	16	Debug("interactive") << "Leaving input loop." << endl << flush;
292	16	break;
293		}
294		}
295
296	32	d_parser->setInput(Input::newStringInput(
297	32	d_solver->getOption("input-language"), input, INPUT_FILENAME));
298
299		/* There may be more than one command in the input. Build up a
300		sequence. */
301	16	CommandSequence *cmd_seq = new CommandSequence();
302		Command *cmd;
303
304		try
305		{
306	40	while ((cmd = d_parser->nextCommand()))
307		{
308	12	cmd_seq->addCommand(cmd);
309	12	if (dynamic_cast<QuitCommand*>(cmd) != NULL)
310		{
311		d_quit = true;
312		break;
313		}
314		else
315		{
316		#if HAVE_LIBEDITLINE
317		if (dynamic_cast<DeclareFunctionCommand*>(cmd) != NULL)
318		{
319		s_declarations.insert(
320		dynamic_cast<DeclareFunctionCommand*>(cmd)->getSymbol());
321		}
322		else if (dynamic_cast<DefineFunctionCommand*>(cmd) != NULL)
323		{
324		s_declarations.insert(
325		dynamic_cast<DefineFunctionCommand*>(cmd)->getSymbol());
326		}
327		else if (dynamic_cast<DeclareSortCommand*>(cmd) != NULL)
328		{
329		s_declarations.insert(
330		dynamic_cast<DeclareSortCommand*>(cmd)->getSymbol());
331		}
332		else if (dynamic_cast<DefineSortCommand*>(cmd) != NULL)
333		{
334		s_declarations.insert(
335		dynamic_cast<DefineSortCommand*>(cmd)->getSymbol());
336		}
337		#endif /* HAVE_LIBEDITLINE */
338		}
339		}
340		}
341		catch (ParserEndOfFileException& pe)
342		{
343		line += "\n";
344		goto restart;
345		}
346		catch (ParserException& pe)
347		{
348		if (d_solver->getOption("output-language") == "LANG_SMTLIB_V2_6")
349		{
350		d_out << "(error \"" << pe << "\")" << endl;
351		}
352		else
353		{
354		d_out << pe << endl;
355		}
356		// We can't really clear out the sequence and abort the current line,
357		// because the parse error might be for the second command on the
358		// line. The first ones haven't yet been executed by the SmtEngine,
359		// but the parser state has already made the variables and the mappings
360		// in the symbol table. So unfortunately, either we exit cvc5 entirely,
361		// or we commit to the current line up to the command with the parse
362		// error.
363		//
364		// FIXME: does that mean e.g. that a pushed LET scope might not yet have
365		// been popped?!
366		//
367		// delete cmd_seq;
368		// cmd_seq = new CommandSequence();
369		}
370
371	16	return cmd_seq;
372		}/* InteractiveShell::readCommand() */
373
374		#if HAVE_LIBEDITLINE
375
376		char** commandCompletion(const char* text, int start, int end) {
377		Debug("rl") << "text: " << text << endl;
378		Debug("rl") << "start: " << start << " end: " << end << endl;
379		return rl_completion_matches(text, commandGenerator);
380		}
381
382		// Our peculiar versions of "less than" for strings
383		struct StringPrefix1Less {
384		bool operator()(const std::string& s1, const std::string& s2) {
385		size_t l1 = s1.length(), l2 = s2.length();
386		size_t l = l1 <= l2 ? l1 : l2;
387		return s1.compare(0, l1, s2, 0, l) < 0;
388		}
389		};/* struct StringPrefix1Less */
390		struct StringPrefix2Less {
391		bool operator()(const std::string& s1, const std::string& s2) {
392		size_t l1 = s1.length(), l2 = s2.length();
393		size_t l = l1 <= l2 ? l1 : l2;
394		return s1.compare(0, l, s2, 0, l2) < 0;
395		}
396		};/* struct StringPrefix2Less */
397
398		char* commandGenerator(const char* text, int state) {
399		static thread_local const std::string* rlCommand;
400		static thread_local set<string>::const_iterator* rlDeclaration;
401
402		const std::string* i = lower_bound(commandsBegin, commandsEnd, text, StringPrefix2Less());
403		const std::string* j = upper_bound(commandsBegin, commandsEnd, text, StringPrefix1Less());
404
405		set<string>::const_iterator ii = lower_bound(s_declarations.begin(), s_declarations.end(), text, StringPrefix2Less());
406		set<string>::const_iterator jj = upper_bound(s_declarations.begin(), s_declarations.end(), text, StringPrefix1Less());
407
408		if(rlDeclaration == NULL) {
409		rlDeclaration = new set<string>::const_iterator();
410		}
411
412		if(state == 0) {
413		rlCommand = i;
414		*rlDeclaration = ii;
415		}
416
417		if(rlCommand != j) {
418		return strdup((*rlCommand++).c_str());
419		}
420
421		return rlDeclaration == jj ? NULL : strdup(((*rlDeclaration)++).c_str());
422		}
423
424		#endif /* HAVE_LIBEDITLINE */
425
426	22725	} // namespace cvc5