5787

1 files changed, 0 insertions, 243 deletions

diff --git a/cleave/cleave.cc b/cleave/cleave.cc
deleted file mode 100644
index a3637e81..00000000
--- a/cleave/cleave.cc
+++ /dev/null
@@ -1,243 +0,0 @@
-// Read a single-file C++ program having a very specific structure, and split
-// it up into multiple separate compilation units to reduce the work needed to
-// rebuild after a small change. Write each compilation unit only if it has
-// changed from what was on disk before.
-//
-// This tool is tightly coupled with the build system for this project. The
-// makefile already auto-generates various things; we only do here what
-// standard unix tools can't easily do.
-//
-// Usage:
-//  cleave [input C++ file] [existing output directory]
-//
-// The input C++ file has the following structure:
-//   [#includes]
-//   [type definitions]
-//   // Globals
-//   [global variable definitions]
-//   // End Globals
-//   [function definitions]
-//
-// Afterwards, the output directory contains:
-//   header -- everything before the '// Globals' delimiter
-//   global_definitions_list -- everything between '// Globals' and '// End Globals' delimiters
-//   [.cc files partitioning function definitions]
-//
-// Each output function definition file contains:
-//   #include "header"
-//   #include "global_declarations_list"
-//   [function definitions]
-//
-// To preserve the original layer-based line numbers in error messages and the
-// debugger, we'll chunk the files only at boundaries where we encounter a
-// '#line ' directive (generated by the previous tangle/ stage) between
-// functions.
-//
-// One exception: the first file emitted #includes "global_definitions_list" instead
-// of "global_declarations_list"
-
-// Tune this parameter to balance time for initial vs incremental build.
-//
-//   decrease value -> faster initial build
-//   increase value -> faster incremental build
-int Num_compilation_units = 3;
-
-#include<assert.h>
-#include<cstdlib>
-#include<cstring>
-
-#include<vector>
-using std::vector;
-#include<list>
-using std::list;
-#include<utility>
-using std::pair;
-
-#include<string>
-using std::string;
-
-#include<iostream>
-using std::istream;
-using std::ostream;
-using std::cin;
-using std::cout;
-using std::cerr;
-
-#include<sstream>
-using std::istringstream;
-using std::ostringstream;
-
-#include<fstream>
-using std::ifstream;
-using std::ofstream;
-
-#include <locale>
-using std::isspace;  // unicode-aware
-
-string trim(const string& s) {
-  string::const_iterator first = s.begin();
-  while (first != s.end() && isspace(*first))
-    ++first;
-  if (first == s.end()) return "";
-
-  string::const_iterator last = --s.end();
-  while (last != s.begin() && isspace(*last))
-    --last;
-  ++last;
-  return string(first, last);
-}
-
-bool starts_with(const string& s, const string& pat) {
-  string::const_iterator a=s.begin(), b=pat.begin();
-  for (/*nada*/; a!=s.end() && b!=pat.end(); ++a, ++b)
-    if (*a != *b) return false;
-  return b == pat.end();
-}
-
-bool has_data(istream& in) {
-  return in && !in.eof();
-}
-
-void slurp(const string& filename, vector<string>& lines) {
-  lines.clear();
-  ifstream in(filename.c_str());
-  while (has_data(in)) {
-    string curr_line;
-    getline(in, curr_line);
-    lines.push_back(curr_line);
-  }
-}
-
-size_t slurp_some_functions(const vector<string>& in, size_t start, vector<string>& out, bool first) {
-  out.clear();
-  if (start >= in.size()) return start;
-  out.push_back("#include \"header\"");
-  if (first)
-    out.push_back("#include \"global_definitions_list\"");
-  else
-    out.push_back("#include \"global_declarations_list\"");
-  out.push_back("");
-  size_t curr = start;
-  while (true) {
-    if (curr >= in.size()) break;
-    if (out.size() >= in.size()/Num_compilation_units) break;
-    while (curr < in.size()) {
-      // read functions -- lines until unindented '}'
-      while (curr < in.size()) {
-        const string& line = in.at(curr);
-//?         cerr << curr << ": adding to function: " << line << '\n';
-        out.push_back(line);  ++curr;
-        if (!line.empty() && line.at(0) == '}') break;
-      }
-      // now look for a '#line' directive before the next non-comment non-empty
-      // line
-      while (curr < in.size()) {
-        const string& line = in.at(curr);
-        if (starts_with(line, "#line ")) goto try_return;
-        out.push_back(line);   ++curr;
-        if (trim(line).empty()) continue;
-        if (starts_with(trim(line), "//")) continue;
-        break;
-      }
-    }
-    try_return:;
-  }
-  return curr;
-}
-
-// compare contents of a file with a list of lines, ignoring #line directives
-// on both sides
-bool no_change(const vector<string>& lines, const string& output_filename) {
-  vector<string> old_lines;
-  slurp(output_filename, old_lines);
-  size_t l=0, o=0;
-  while (true) {
-    while (l < lines.size() &&
-            (lines.at(l).empty() || starts_with(lines.at(l), "#line "))) {
-      ++l;
-    }
-    while (o < old_lines.size() &&
-            (old_lines.at(o).empty() || starts_with(old_lines.at(o), "#line "))) {
-      ++o;
-    }
-    if (l >= lines.size() && o >= old_lines.size()) return true;  // no change
-    if (l >= lines.size() || o >= old_lines.size()) return false;  // contents changed
-//?     cerr << "comparing\n";
-//?     cerr << o << ": " << old_lines.at(o) << '\n';
-//?     cerr << l << ": " << lines.at(l) << '\n';
-    if (lines.at(l) != old_lines.at(o)) return false;  // contents changed
-    ++l;  ++o;
-  }
-  assert(false);
-}
-
-string next_output_filename(const string& output_directory) {
-  static int file_count = 0;
-  ostringstream out;
-  out << output_directory << "/mu_" << file_count << ".cc";
-  file_count++;
-  return out.str();
-}
-
-void emit_file(const vector<string>& lines, const string& output_filename) {
-  if (no_change(lines, output_filename)) return;
-  cerr << "  updating " << output_filename << '\n';
-  ofstream out(output_filename.c_str());
-  for (size_t i = 0; i < lines.size(); ++i)
-    out << lines.at(i) << '\n';
-}
-
-void emit_compilation_unit(const vector<string>& lines, const string& output_directory) {
-  string output_filename = next_output_filename(output_directory);
-  emit_file(lines, output_filename);
-}
-
-int main(int argc, const char* argv[]) {
-  if (argc != 3) {
-    cerr << "usage: cleave [input .cc file] [output directory]\n";
-    exit(0);
-  }
-
-  // read input
-  vector<string> lines;
-  slurp(argv[1], lines);
-
-  // write header until but excluding '// Global' delimiter
-  string output_directory = argv[2];
-  size_t line_num = 0;
-  {
-    vector<string> out;
-    while (line_num < lines.size()) {
-      const string& line = lines.at(line_num);
-      if (trim(line) == "// Globals") break;  // todo: #line directive for delimiters
-      out.push_back(line);
-      ++line_num;
-    }
-    emit_file(out, output_directory+"/header");
-  }
-
-  // write global_definitions_list (including delimiters)
-  {
-    vector<string> out;
-    while (line_num < lines.size()) {
-      const string& line = lines.at(line_num);
-      out.push_back(line);
-      ++line_num;
-      if (trim(line) == "// End Globals") break;
-    }
-    emit_file(out, output_directory+"/global_definitions_list");
-  }
-
-  // segment functions
-  // first one is special
-  if (line_num < lines.size()) {
-    vector<string> function;
-    line_num = slurp_some_functions(lines, line_num, function, true);
-    emit_compilation_unit(function, output_directory);
-  }
-  while (line_num < lines.size()) {
-    vector<string> function;
-    line_num = slurp_some_functions(lines, line_num, function, false);
-    emit_compilation_unit(function, output_directory);
-  }
-}