cmRST.cxx
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmRST.h"
#include "cmAlgorithms.h"
#include "cmSystemTools.h"
#include "cmVersion.h"
#include "cmsys/FStream.hxx"
#include <algorithm>
#include <ctype.h>
#include <iterator>
#include <stddef.h>
#include <utility>
cmRST::cmRST(std::ostream& os, std::string const& docroot)
: OS(os)
, DocRoot(docroot)
, IncludeDepth(0)
, OutputLinePending(false)
, LastLineEndedInColonColon(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]*(.*)$")
, ProductionListDirective("^.. productionlist::[ \t]*(.*)$")
, NoteDirective("^.. note::[ \t]*(.*)$")
, ModuleRST("^#\\[(=*)\\[\\.rst:$")
, CMakeRole("(:cmake)?:("
"command|generator|variable|module|policy|"
"prop_cache|prop_dir|prop_gbl|prop_inst|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_]|$)")
, TocTreeLink("^.*[ \t]+<([^>]+)>$")
{
this->Replace["|release|"] = cmVersion::GetCMakeVersion();
}
bool cmRST::ProcessFile(std::string const& fname, bool isModule)
{
cmsys::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.empty() && rst != "#") {
// Bracket mode: check for end bracket
std::string::size_type pos = line.find(rst);
if (pos == std::string::npos) {
this->ProcessLine(line);
} else {
if (line[0] != '#') {
this->ProcessLine(line.substr(0, pos));
}
rst.clear();
this->Reset();
this->OutputLinePending = true;
}
} else {
// Line mode: check for .rst start (bracket or line)
if (rst == "#") {
if (line == "#") {
this->ProcessLine("");
continue;
}
if (line.substr(0, 2) == "# ") {
this->ProcessLine(line.substr(2));
continue;
}
rst.clear();
this->Reset();
this->OutputLinePending = true;
}
if (line == "#.rst:") {
rst = "#";
} else if (this->ModuleRST.find(line)) {
rst = "]" + this->ModuleRST.match(1) + "]";
}
}
}
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 DirectiveLiteralBlock:
this->ProcessDirectiveLiteralBlock();
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)
{
bool lastLineEndedInColonColon = this->LastLineEndedInColonColon;
this->LastLineEndedInColonColon = false;
// 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) == std::string::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));
} else if (this->ProductionListDirective.find(line)) {
// Output productionlist directives and their content normally.
this->NormalLine(line);
} else if (this->NoteDirective.find(line)) {
// Output note directives and their content normally.
this->NormalLine(line);
}
}
// 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);
}
}
// A blank line following a paragraph ending in "::" starts a literal block.
else if (lastLineEndedInColonColon && line.empty()) {
// Record the literal lines to output after whole block.
this->Markup = MarkupNormal;
this->Directive = DirectiveLiteralBlock;
this->MarkupLines.push_back("");
this->OutputLine("", false);
}
// Print non-markup lines.
else {
this->NormalLine(line);
this->LastLineEndedInColonColon =
(line.size() >= 2 && line[line.size() - 2] == ':' &&
line[line.size() - 1] == ':');
}
}
void cmRST::NormalLine(std::string const& line)
{
this->Reset();
this->OutputLine(line, true);
}
void cmRST::OutputLine(std::string const& line_in, bool inlineMarkup)
{
if (this->OutputLinePending) {
this->OS << "\n";
this->OutputLinePending = false;
}
if (inlineMarkup) {
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("()") == std::string::npos) {
text += "()";
}
this->OS << "``" << text << "``";
pos += this->CMakeRole.end();
}
this->OS << line.substr(pos) << "\n";
} else {
this->OS << line_in << "\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<std::string, std::string>::iterator replace =
this->Replace.find(substitute);
if (replace != this->Replace.end()) {
std::pair<std::set<std::string>::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;
}
void cmRST::OutputMarkupLines(bool inlineMarkup)
{
for (auto line : this->MarkupLines) {
if (!line.empty()) {
line = " " + line;
}
this->OutputLine(line, inlineMarkup);
}
this->OutputLinePending = true;
}
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()
{
this->OutputMarkupLines(true);
}
void cmRST::ProcessDirectiveLiteralBlock()
{
this->OutputMarkupLines(false);
}
void cmRST::ProcessDirectiveCodeBlock()
{
this->OutputMarkupLines(false);
}
void cmRST::ProcessDirectiveReplace()
{
// Record markup lines as replacement text.
std::string& replacement = this->Replace[this->ReplaceName];
replacement += cmJoin(this->MarkupLines, " ");
this->ReplaceName.clear();
}
void cmRST::ProcessDirectiveTocTree()
{
// Process documents referenced by toctree directive.
for (std::string const& line : this->MarkupLines) {
if (!line.empty() && line[0] != ':') {
if (this->TocTreeLink.find(line)) {
std::string const& link = this->TocTreeLink.match(1);
this->ProcessInclude(link + ".rst", IncludeTocTree);
} else {
this->ProcessInclude(line + ".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.
indentEnd = std::min(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);
}
}
std::vector<std::string>::const_iterator it = lines.begin();
size_t leadingEmpty = std::distance(it, cmFindNot(lines, std::string()));
std::vector<std::string>::const_reverse_iterator rit = lines.rbegin();
size_t trailingEmpty =
std::distance(rit, cmFindNot(cmReverseRange(lines), std::string()));
std::vector<std::string>::iterator contentEnd = cmRotate(
lines.begin(), lines.begin() + leadingEmpty, lines.end() - trailingEmpty);
lines.erase(contentEnd, lines.end());
}