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#include <algorithm>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>
#include <assert.h>
using namespace std;
#include "eval_env.h"
int ReadFile(const string& path, string* contents, string* err);
struct DiskInterface {
// stat() a file, returning the mtime, or 0 if missing and -1 on other errors.
virtual int Stat(const string& path) = 0;
// Create a directory, returning false on failure.
virtual bool MakeDir(const string& path) = 0;
// Read a file to a string. Fill in |err| on error.
virtual string ReadFile(const string& path, string* err) = 0;
// Create all the parent directories for path; like mkdir -p `basename path`.
bool MakeDirs(const string& path);
};
struct RealDiskInterface : public DiskInterface {
virtual int Stat(const string& path);
virtual bool MakeDir(const string& path);
virtual string ReadFile(const string& path, string* err);
};
struct Node;
struct FileStat {
FileStat(const string& path) : path_(path), mtime_(-1), node_(NULL) {}
void Touch(int mtime);
// Return true if the file exists (mtime_ got a value).
bool Stat(DiskInterface* disk_interface);
// Return true if we needed to stat.
bool StatIfNecessary(DiskInterface* disk_interface) {
if (status_known())
return false;
Stat(disk_interface);
return true;
}
bool exists() const {
assert(status_known());
return mtime_ != 0;
}
bool status_known() const {
return mtime_ != -1;
}
string path_;
// Possible values of mtime_:
// -1: file hasn't been examined
// 0: we looked, and file doesn't exist
// >0: actual file's mtime
time_t mtime_;
Node* node_;
};
struct Edge;
struct Node {
Node(FileStat* file) : file_(file), dirty_(false), in_edge_(NULL) {}
bool dirty() const { return dirty_; }
void MarkDirty();
void MarkDependentsDirty();
FileStat* file_;
bool dirty_;
Edge* in_edge_;
vector<Edge*> out_edges_;
};
struct Rule {
Rule(const string& name) : name_(name) { }
void ParseCommand(const string& command) {
assert(command_.Parse(command)); // XXX
}
string name_;
EvalString command_;
EvalString depfile_;
};
class State;
struct Edge {
Edge() : rule_(NULL), env_(NULL), implicit_deps_(0) {}
void MarkDirty(Node* node);
bool RecomputeDirty(State* state, DiskInterface* disk_interface, string* err);
string EvaluateCommand(); // XXX move to env, take env ptr
bool LoadDepFile(State* state, DiskInterface* disk_interface, string* err);
enum InOut { IN, OUT };
Rule* rule_;
vector<Node*> inputs_;
vector<Node*> outputs_;
EvalString::Env* env_;
int implicit_deps_; // Count on the end of the inputs list.
};
struct StatCache {
typedef map<string, FileStat*> Paths;
Paths paths_;
FileStat* GetFile(const string& path);
void Dump();
void Reload();
};
struct State : public EvalString::Env {
StatCache stat_cache_;
map<string, Rule*> rules_;
vector<Edge*> edges_;
map<string, string> env_;
StatCache* stat_cache() { return &stat_cache_; }
// EvalString::Env impl
virtual string Evaluate(const string& var);
void AddRule(Rule* rule);
Rule* LookupRule(const string& rule_name);
Edge* AddEdge(Rule* rule);
Node* GetNode(const string& path);
Node* LookupNode(const string& path);
void AddInOut(Edge* edge, Edge::InOut inout, const string& path);
void AddBinding(const string& key, const string& val);
};
struct Plan {
explicit Plan(State* state) : state_(state) {}
Node* AddTarget(const string& path, string* err);
bool AddTarget(Node* node, string* err);
Edge* FindWork();
void EdgeFinished(Edge* edge);
void NodeFinished(Node* node);
State* state_;
set<Node*> want_;
queue<Edge*> ready_;
private:
Plan();
Plan(const Plan&);
};
struct Shell {
virtual ~Shell() {}
virtual bool RunCommand(Edge* edge);
};
struct Builder {
Builder(State* state)
: state_(state), plan_(state), disk_interface_(&default_disk_interface_) {}
virtual ~Builder() {}
Node* AddTarget(const string& name, string* err);
bool Build(Shell* shell, string* err);
State* state_;
Plan plan_;
RealDiskInterface default_disk_interface_;
DiskInterface* disk_interface_;
};
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