summaryrefslogtreecommitdiffstats
path: root/Source/cmIfCommand.h
blob: 757377c5d6d379d07451e1f132404648e9e527f7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef cmIfCommand_h
#define cmIfCommand_h

#include "cmCommand.h"
#include "cmFunctionBlocker.h"

/** \class cmIfFunctionBlocker
 * \brief subclass of function blocker
 *
 * 
 */
class cmIfFunctionBlocker : public cmFunctionBlocker
{
public:
  cmIfFunctionBlocker() {this->HasRun = false;}
  virtual ~cmIfFunctionBlocker() {}
  virtual bool IsFunctionBlocked(const cmListFileFunction& lff,
                                 cmMakefile &mf);
  virtual bool ShouldRemove(const cmListFileFunction& lff,
                            cmMakefile &mf);
  virtual void ScopeEnded(cmMakefile &mf);
  
  std::vector<cmListFileArgument> Args;
  bool IsBlocking;
  bool HasRun;
};

/** \class cmIfCommand
 * \brief starts an if block
 *
 * cmIfCommand starts an if block
 */
class cmIfCommand : public cmCommand
{
public:
  /**
   * This is a virtual constructor for the command.
   */
  virtual cmCommand* Clone() 
    {
    return new cmIfCommand;
    }

  /**
   * This overrides the default InvokeInitialPass implementation.
   * It records the arguments before expansion.
   */
  virtual bool InvokeInitialPass(const std::vector<cmListFileArgument>& args);
    
  /**
   * This is called when the command is first encountered in
   * the CMakeLists.txt file.
   */
  virtual bool InitialPass(std::vector<std::string> const&) { return false; }

  /**
   * The name of the command as specified in CMakeList.txt.
   */
  virtual const char* GetName() { return "IF";}

  /**
   * Succinct documentation.
   */
  virtual const char* GetTerseDocumentation() 
    {
    return "Conditionally execute a group of commands.";
    }
  
  /**
   * This determines if the command is invoked when in script mode.
   */
  virtual bool IsScriptable() { return true; }

  /**
   * More documentation.
   */
  virtual const char* GetFullDocumentation()
    {
    return
      "  IF(expression)\n"
      "    # THEN section.\n"
      "    COMMAND1(ARGS ...)\n"
      "    COMMAND2(ARGS ...)\n"
      "    ...\n"
      "  ELSE(expression)\n"
      "    # ELSE section.\n"
      "    COMMAND1(ARGS ...)\n"
      "    COMMAND2(ARGS ...)\n"
      "    ...\n"
      "  ENDIF(expression)\n"
      "Evaluates the given expression.  If the result is true, the commands "
      "in the THEN section are invoked.  Otherwise, the commands in the "
      "ELSE section are invoked.  The ELSE section is optional.  Note that "
      "the same expression must be given to IF, ELSE, and ENDIF.  Long "
      "expressions can be used and the order or precedence is that the "
      "EXISTS, COMMAND, and DEFINED operators will be evaluated first. "
      "Then any EQUAL, LESS, GREATER, STRLESS, STRGREATER, STREQUAL, MATCHES "
      "will be evaluated. Then NOT operators and finally AND, OR operators "
      "will be evaluated. Possible expressions are:\n"
      "  IF(variable)\n"
      "True if the variable's value is not empty, 0, N, NO, OFF, FALSE, "
      "NOTFOUND, or <variable>-NOTFOUND.\n"
      "  IF(NOT variable)\n"
      "True if the variable's value is empty, 0, N, NO, OFF, FALSE, "
      "NOTFOUND, or <variable>-NOTFOUND.\n"
      "  IF(variable1 AND variable2)\n"
      "True if both variables would be considered true individually.\n"
      "  IF(variable1 OR variable2)\n"
      "True if either variable would be considered true individually.\n"
      "  IF(COMMAND command-name)\n"
      "True if the given name is a command that can be invoked.\n"
      "  IF(EXISTS file-name)\n"
      "  IF(EXISTS directory-name)\n"
      "True if the named file or directory exists.  "
      "Behavior is well-defined only for full paths.\n"
      "  IF(file1 IS_NEWER_THAN file2)\n"
      "True if file1 is newer than file2 or if one of the two files "
      "doesn't exist. "
      "Behavior is well-defined only for full paths.\n"
      "  IF(IS_DIRECTORY directory-name)\n"
      "True if the given name is a directory.  "
      "Behavior is well-defined only for full paths.\n"
      "  IF(variable MATCHES regex)\n"
      "  IF(string MATCHES regex)\n"
      "True if the given string or variable's value matches the given "
      "regular expression.\n"
      "  IF(variable LESS number)\n"
      "  IF(string LESS number)\n"
      "  IF(variable GREATER number)\n"
      "  IF(string GREATER number)\n"
      "  IF(variable EQUAL number)\n"
      "  IF(string EQUAL number)\n"
      "True if the given string or variable's value is a valid number and "
      "the inequality or equality is true.\n"
      "  IF(variable STRLESS string)\n"
      "  IF(string STRLESS string)\n"
      "  IF(variable STRGREATER string)\n"
      "  IF(string STRGREATER string)\n"
      "  IF(variable STREQUAL string)\n"
      "  IF(string STREQUAL string)\n"
      "True if the given string or variable's value is lexicographically "
      "less (or greater, or equal) than the string on the right.\n"
      "  IF(DEFINED variable)\n"
      "True if the given variable is defined. It does not matter if the "
      "variable is true or false just if it has been set.";
    }

  // this is a shared function for both If and Else to determine if the
  // arguments were valid, and if so, was the response true. If there is
  // an error, the errorString will be set.
  static bool IsTrue(const std::vector<std::string> &args, 
    char** errorString, const cmMakefile *mf);
  
  // Get a definition from the makefile.  If it doesn't exist,
  // return the original string.
  static const char* GetVariableOrString(const char* str,
                                         const cmMakefile* mf);
  static const char* GetVariableOrNumber(const char* str,
                                         const cmMakefile* mf);
  
  
  cmTypeMacro(cmIfCommand, cmCommand);
};


#endif