Commit 25f2877e authored by Brad King's avatar Brad King
Browse files

Add class cmRST to do basic reStructuredText processing

Create a cmRST class to perform just enough reStructuredText processing
to support display of Help documents in human-readable text format.
This will be used to implement --help-* command-line options.

Support directives "include", "replace", "parsed-literal", "toctree"
(Sphinx), and "cmake-module" (CMake Sphinx Extension to scan .cmake
modules).  Support inline CMake Sphinx Domain roles to convert
cross-references to corresponding title text.  Support inline
substitutions defined by the "replace" directive, but keep it simple by
requiring replacements to be defined before use.

Add a CMakeLib "testRST" case to cover processing of supported
constructs and compare results against expected output.
parent 87cc62ca
......@@ -262,6 +262,8 @@ set(SRCS
cmPropertyMap.h
cmQtAutomoc.cxx
cmQtAutomoc.h
cmRST.cxx
cmRST.h
cmScriptGenerator.h
cmScriptGenerator.cxx
cmSourceFile.cxx
......
/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2013 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmRST.h"
#include "cmSystemTools.h"
#include <ctype.h>
//----------------------------------------------------------------------------
cmRST::cmRST(std::ostream& os, std::string const& docroot):
OS(os),
DocRoot(docroot),
IncludeDepth(0),
OutputLinePending(false),
Markup(MarkupNone),
Directive(DirectiveNone),
CMakeDirective("^.. (cmake:)?("
"command|variable"
")::[ \t]+([^ \t\n]+)$"),
CMakeModuleDirective("^.. cmake-module::[ \t]+([^ \t\n]+)$"),
ParsedLiteralDirective("^.. parsed-literal::[ \t]*(.*)$"),
CodeBlockDirective("^.. code-block::[ \t]*(.*)$"),
ReplaceDirective("^.. (\\|[^|]+\\|) replace::[ \t]*(.*)$"),
IncludeDirective("^.. include::[ \t]+([^ \t\n]+)$"),
TocTreeDirective("^.. toctree::[ \t]*(.*)$"),
CMakeRole("(:cmake)?:("
"command|generator|variable|module|policy|"
"prop_cache|prop_dir|prop_gbl|prop_sf|prop_test|prop_tgt|"
"manual"
"):`(<*([^`<]|[^` \t]<)*)([ \t]+<[^`]*>)?`"),
Substitution("(^|[^A-Za-z0-9_])"
"((\\|[^| \t\r\n]([^|\r\n]*[^| \t\r\n])?\\|)(__|_|))"
"([^A-Za-z0-9_]|$)")
{
}
//----------------------------------------------------------------------------
bool cmRST::ProcessFile(std::string const& fname, bool isModule)
{
std::ifstream fin(fname.c_str());
if(fin)
{
this->DocDir = cmSystemTools::GetFilenamePath(fname);
if(isModule)
{
this->ProcessModule(fin);
}
else
{
this->ProcessRST(fin);
}
this->OutputLinePending = true;
return true;
}
return false;
}
//----------------------------------------------------------------------------
void cmRST::ProcessRST(std::istream& is)
{
std::string line;
while(cmSystemTools::GetLineFromStream(is, line))
{
this->ProcessLine(line);
}
this->Reset();
}
//----------------------------------------------------------------------------
void cmRST::ProcessModule(std::istream& is)
{
std::string line;
std::string rst;
while(cmSystemTools::GetLineFromStream(is, line))
{
if(rst == "#")
{
if(line == "#")
{
this->ProcessLine("");
continue;
}
else if(line.substr(0, 2) == "# ")
{
this->ProcessLine(line.substr(2, line.npos));
continue;
}
else
{
rst = "";
this->Reset();
this->OutputLinePending = true;
}
}
if(line == "#.rst:")
{
rst = "#";
}
}
if(rst == "#")
{
this->Reset();
}
}
//----------------------------------------------------------------------------
void cmRST::Reset()
{
if(!this->MarkupLines.empty())
{
this->UnindentLines(this->MarkupLines);
}
switch(this->Directive)
{
case DirectiveNone: break;
case DirectiveParsedLiteral: this->ProcessDirectiveParsedLiteral(); break;
case DirectiveCodeBlock: this->ProcessDirectiveCodeBlock(); break;
case DirectiveReplace: this->ProcessDirectiveReplace(); break;
case DirectiveTocTree: this->ProcessDirectiveTocTree(); break;
}
this->Markup = MarkupNone;
this->Directive = DirectiveNone;
this->MarkupLines.clear();
}
//----------------------------------------------------------------------------
void cmRST::ProcessLine(std::string const& line)
{
// A line starting in .. is an explicit markup start.
if(line == ".." || (line.size() >= 3 && line[0] == '.' &&
line[1] == '.' && isspace(line[2])))
{
this->Reset();
this->Markup = (line.find_first_not_of(" \t", 2) == line.npos ?
MarkupEmpty : MarkupNormal);
if(this->CMakeDirective.find(line))
{
// Output cmake domain directives and their content normally.
this->NormalLine(line);
}
else if(this->CMakeModuleDirective.find(line))
{
// Process cmake-module directive: scan .cmake file comments.
std::string file = this->CMakeModuleDirective.match(1);
if(file.empty() || !this->ProcessInclude(file, IncludeModule))
{
this->NormalLine(line);
}
}
else if(this->ParsedLiteralDirective.find(line))
{
// Record the literal lines to output after whole block.
this->Directive = DirectiveParsedLiteral;
this->MarkupLines.push_back(this->ParsedLiteralDirective.match(1));
}
else if(this->CodeBlockDirective.find(line))
{
// Record the literal lines to output after whole block.
// Ignore the language spec and record the opening line as blank.
this->Directive = DirectiveCodeBlock;
this->MarkupLines.push_back("");
}
else if(this->ReplaceDirective.find(line))
{
// Record the replace directive content.
this->Directive = DirectiveReplace;
this->ReplaceName = this->ReplaceDirective.match(1);
this->MarkupLines.push_back(this->ReplaceDirective.match(2));
}
else if(this->IncludeDirective.find(line))
{
// Process the include directive or output the directive and its
// content normally if it fails.
std::string file = this->IncludeDirective.match(1);
if(file.empty() || !this->ProcessInclude(file, IncludeNormal))
{
this->NormalLine(line);
}
}
else if(this->TocTreeDirective.find(line))
{
// Record the toctree entries to process after whole block.
this->Directive = DirectiveTocTree;
this->MarkupLines.push_back(this->TocTreeDirective.match(1));
}
}
// An explicit markup start followed nothing but whitespace and a
// blank line does not consume any indented text following.
else if(this->Markup == MarkupEmpty && line.empty())
{
this->NormalLine(line);
}
// Indented lines following an explicit markup start are explicit markup.
else if(this->Markup && (line.empty() || isspace(line[0])))
{
this->Markup = MarkupNormal;
// Record markup lines if the start line was recorded.
if(!this->MarkupLines.empty())
{
this->MarkupLines.push_back(line);
}
}
// Print non-markup lines.
else
{
this->NormalLine(line);
}
}
//----------------------------------------------------------------------------
void cmRST::NormalLine(std::string const& line)
{
this->Reset();
this->OutputLine(line);
}
//----------------------------------------------------------------------------
void cmRST::OutputLine(std::string const& line_in)
{
if(this->OutputLinePending)
{
this->OS << "\n";
this->OutputLinePending = false;
}
std::string line = this->ReplaceSubstitutions(line_in);
std::string::size_type pos = 0;
while(this->CMakeRole.find(line.c_str()+pos))
{
this->OS << line.substr(pos, this->CMakeRole.start());
std::string text = this->CMakeRole.match(3);
// If a command reference has no explicit target and
// no explicit "(...)" then add "()" to the text.
if(this->CMakeRole.match(2) == "command" &&
this->CMakeRole.match(5).empty() &&
text.find_first_of("()") == text.npos)
{
text += "()";
}
this->OS << "``" << text << "``";
pos += this->CMakeRole.end();
}
this->OS << line.substr(pos) << "\n";
}
//----------------------------------------------------------------------------
std::string cmRST::ReplaceSubstitutions(std::string const& line)
{
std::string out;
std::string::size_type pos = 0;
while(this->Substitution.find(line.c_str()+pos))
{
std::string::size_type start = this->Substitution.start(2);
std::string::size_type end = this->Substitution.end(2);
std::string substitute = this->Substitution.match(3);
std::map<cmStdString, cmStdString>::iterator
replace = this->Replace.find(substitute);
if(replace != this->Replace.end())
{
std::pair<std::set<cmStdString>::iterator, bool> replaced =
this->Replaced.insert(substitute);
if(replaced.second)
{
substitute = this->ReplaceSubstitutions(replace->second);
this->Replaced.erase(replaced.first);
}
}
out += line.substr(pos, start);
out += substitute;
pos += end;
}
out += line.substr(pos);
return out;
}
//----------------------------------------------------------------------------
bool cmRST::ProcessInclude(std::string file, IncludeType type)
{
bool found = false;
if(this->IncludeDepth < 10)
{
cmRST r(this->OS, this->DocRoot);
r.IncludeDepth = this->IncludeDepth + 1;
r.OutputLinePending = this->OutputLinePending;
if(type != IncludeTocTree)
{
r.Replace = this->Replace;
}
if(file[0] == '/')
{
file = this->DocRoot + file;
}
else
{
file = this->DocDir + "/" + file;
}
found = r.ProcessFile(file, type == IncludeModule);
if(type != IncludeTocTree)
{
this->Replace = r.Replace;
}
this->OutputLinePending = r.OutputLinePending;
}
return found;
}
//----------------------------------------------------------------------------
void cmRST::ProcessDirectiveParsedLiteral()
{
// Output markup lines as literal text.
for(std::vector<std::string>::iterator i = this->MarkupLines.begin();
i != this->MarkupLines.end(); ++i)
{
std::string line = *i;
if(!line.empty())
{
line = " " + line;
}
this->OutputLine(line);
}
this->OutputLinePending = true;
}
//----------------------------------------------------------------------------
void cmRST::ProcessDirectiveCodeBlock()
{
// Treat markup lines the same as a parsed literal.
this->ProcessDirectiveParsedLiteral();
}
//----------------------------------------------------------------------------
void cmRST::ProcessDirectiveReplace()
{
// Record markup lines as replacement text.
std::string& replacement = this->Replace[this->ReplaceName];
const char* sep = "";
for(std::vector<std::string>::iterator i = this->MarkupLines.begin();
i != this->MarkupLines.end(); ++i)
{
replacement += sep;
replacement += *i;
sep = " ";
}
this->ReplaceName = "";
}
//----------------------------------------------------------------------------
void cmRST::ProcessDirectiveTocTree()
{
// Process documents referenced by toctree directive.
for(std::vector<std::string>::iterator i = this->MarkupLines.begin();
i != this->MarkupLines.end(); ++i)
{
if(!i->empty() && i->find_first_of(":") == i->npos)
{
this->ProcessInclude(*i + ".rst", IncludeTocTree);
}
}
}
//----------------------------------------------------------------------------
void cmRST::UnindentLines(std::vector<std::string>& lines)
{
// Remove the common indentation from the second and later lines.
std::string indentText;
std::string::size_type indentEnd = 0;
bool first = true;
for(size_t i = 1; i < lines.size(); ++i)
{
std::string const& line = lines[i];
// Do not consider empty lines.
if(line.empty())
{
continue;
}
// Record indentation on first non-empty line.
if(first)
{
first = false;
indentEnd = line.find_first_not_of(" \t");
indentText = line.substr(0, indentEnd);
continue;
}
// Truncate indentation to match that on this line.
if(line.size() < indentEnd)
{
indentEnd = line.size();
}
for(std::string::size_type j = 0; j != indentEnd; ++j)
{
if(line[j] != indentText[j])
{
indentEnd = j;
break;
}
}
}
// Update second and later lines.
for(size_t i = 1; i < lines.size(); ++i)
{
std::string& line = lines[i];
if(!line.empty())
{
line = line.substr(indentEnd);
}
}
// Drop leading blank lines.
size_t leadingEmpty = 0;
for(size_t i = 0; i < lines.size() && lines[i].empty(); ++i)
{
++leadingEmpty;
}
lines.erase(lines.begin(), lines.begin()+leadingEmpty);
// Drop trailing blank lines.
size_t trailingEmpty = 0;
for(size_t i = lines.size(); i > 0 && lines[i-1].empty(); --i)
{
++trailingEmpty;
}
lines.erase(lines.end()-trailingEmpty, lines.end());
}
/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2013 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#ifndef _cmRST_h
#define _cmRST_h
#include "cmStandardIncludes.h"
#include <cmsys/RegularExpression.hxx>
class cmRST
{
public:
cmRST(std::ostream& os, std::string const& docroot);
bool ProcessFile(std::string const& fname, bool isModule = false);
private:
enum IncludeType
{
IncludeNormal,
IncludeModule,
IncludeTocTree
};
enum MarkupType
{
MarkupNone,
MarkupNormal,
MarkupEmpty
};
enum DirectiveType
{
DirectiveNone,
DirectiveParsedLiteral,
DirectiveCodeBlock,
DirectiveReplace,
DirectiveTocTree
};
void ProcessRST(std::istream& is);
void ProcessModule(std::istream& is);
void Reset();
void ProcessLine(std::string const& line);
void NormalLine(std::string const& line);
void OutputLine(std::string const& line);
std::string ReplaceSubstitutions(std::string const& line);
bool ProcessInclude(std::string file, IncludeType type);
void ProcessDirectiveParsedLiteral();
void ProcessDirectiveCodeBlock();
void ProcessDirectiveReplace();
void ProcessDirectiveTocTree();
static void UnindentLines(std::vector<std::string>& lines);
std::ostream& OS;
std::string DocRoot;
int IncludeDepth;
bool OutputLinePending;
MarkupType Markup;
DirectiveType Directive;
cmsys::RegularExpression CMakeDirective;
cmsys::RegularExpression CMakeModuleDirective;
cmsys::RegularExpression ParsedLiteralDirective;
cmsys::RegularExpression CodeBlockDirective;
cmsys::RegularExpression ReplaceDirective;
cmsys::RegularExpression IncludeDirective;
cmsys::RegularExpression TocTreeDirective;
cmsys::RegularExpression CMakeRole;
cmsys::RegularExpression Substitution;
std::vector<std::string> MarkupLines;
std::string DocDir;
std::map<cmStdString, cmStdString> Replace;
std::set<cmStdString> Replaced;
std::string ReplaceName;
};
#endif
......@@ -6,6 +6,7 @@ include_directories(
set(CMakeLib_TESTS
testGeneratedFileStream
testRST
testSystemTools
testUTF8
testXMLParser
......
/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2013 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmRST.h"
#include "cmSystemTools.h"
void reportLine(std::ostream& os, bool ret, std::string line, bool eol)
{
if(ret)
{
os << "\"" << line << "\" (" << (eol?"with EOL":"without EOL") << ")";
}
else
{
os << "EOF";
}
}
int testRST(int, char*[])
{
std::string dir = cmSystemTools::GetFilenamePath(__FILE__);
if(dir.empty())
{
dir = ".";
}
std::string a_name = "testRST.actual";
std::string e_name = dir + "/testRST.expect";
// Process the test RST file.
{
std::string fname = dir + "/testRST.rst";
std::ofstream fout(a_name.c_str());
if(!fout)
{
std::cerr << "Could not open output " << a_name << std::endl;
return 1;
}
cmRST r(fout, dir);
if(!r.ProcessFile(fname))
{
std::cerr << "Could not open input " << fname << std::endl;
return 1;
}
}
// Compare expected and actual outputs.
std::ifstream e_fin(e_name.c_str());
std::ifstream a_fin(a_name.c_str());
if(!e_fin)
{
std::cerr << "Could not open input " << e_name << std::endl;
return 1;
}
if(!a_fin)
{
std::cerr << "Could not open input " << a_name << std::endl;
return 1;
}
int lineno = 0;
bool e_ret;
bool a_ret;
do
{
std::string e_line;
std::string a_line;
bool e_eol;
bool a_eol;
e_ret = cmSystemTools::GetLineFromStream(e_fin, e_line, &e_eol);
a_ret = cmSystemTools::GetLineFromStream(a_fin, a_line, &a_eol);
++lineno;
if(e_ret != a_ret || e_line != a_line || e_eol != a_eol)