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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "../sys/platform.h"
#include "../sys/ref.h"
#include "../sys/filename.h"
#include "../sys/string.h"
#include <vector>
#include <iostream>
#include <cstdio>
#include <string.h>
namespace embree
{
/*! stores the location of a stream element in the source */
class ParseLocation
{
public:
ParseLocation () : lineNumber(-1), colNumber(-1) {}
ParseLocation (std::shared_ptr<std::string> fileName, ssize_t lineNumber, ssize_t colNumber, ssize_t /*charNumber*/)
: fileName(fileName), lineNumber(lineNumber), colNumber(colNumber) {}
std::string str() const
{
std::string str = "unknown";
if (fileName) str = *fileName;
if (lineNumber >= 0) str += " line " + toString(lineNumber);
if (lineNumber >= 0 && colNumber >= 0) str += " character " + toString(colNumber);
return str;
}
private:
std::shared_ptr<std::string> fileName; /// name of the file (or stream) the token is from
ssize_t lineNumber; /// the line number the token is from
ssize_t colNumber; /// the character number in the current line
};
/*! a stream class templated over the stream elements */
template<typename T> class Stream : public RefCount
{
enum { BUF_SIZE = 1024 };
private:
virtual T next() = 0;
virtual ParseLocation location() = 0;
__forceinline std::pair<T,ParseLocation> nextHelper() {
ParseLocation l = location();
T v = next();
return std::pair<T,ParseLocation>(v,l);
}
__forceinline void push_back(const std::pair<T,ParseLocation>& v) {
if (past+future == BUF_SIZE) pop_front();
size_t end = (start+past+future++)%BUF_SIZE;
buffer[end] = v;
}
__forceinline void pop_front() {
if (past == 0) THROW_RUNTIME_ERROR("stream buffer empty");
start = (start+1)%BUF_SIZE; past--;
}
public:
Stream () : start(0), past(0), future(0), buffer(BUF_SIZE) {}
virtual ~Stream() {}
public:
const ParseLocation& loc() {
if (future == 0) push_back(nextHelper());
return buffer[(start+past)%BUF_SIZE].second;
}
T get() {
if (future == 0) push_back(nextHelper());
T t = buffer[(start+past)%BUF_SIZE].first;
past++; future--;
return t;
}
const T& peek() {
if (future == 0) push_back(nextHelper());
return buffer[(start+past)%BUF_SIZE].first;
}
const T& unget(size_t n = 1) {
if (past < n) THROW_RUNTIME_ERROR ("cannot unget that many items");
past -= n; future += n;
return peek();
}
void drop() {
if (future == 0) push_back(nextHelper());
past++; future--;
}
private:
size_t start,past,future;
std::vector<std::pair<T,ParseLocation> > buffer;
};
/*! warps an iostream stream */
class StdStream : public Stream<int>
{
public:
StdStream (std::istream& cin, const std::string& name = "std::stream")
: cin(cin), lineNumber(1), colNumber(0), charNumber(0), name(std::shared_ptr<std::string>(new std::string(name))) {}
~StdStream() {}
ParseLocation location() {
return ParseLocation(name,lineNumber,colNumber,charNumber);
}
int next() {
int c = cin.get();
if (c == '\n') { lineNumber++; colNumber = 0; } else if (c != '\r') colNumber++;
charNumber++;
return c;
}
private:
std::istream& cin;
ssize_t lineNumber; /// the line number the token is from
ssize_t colNumber; /// the character number in the current line
ssize_t charNumber; /// the character in the file
std::shared_ptr<std::string> name; /// name of buffer
};
/*! creates a stream from a file */
class FileStream : public Stream<int>
{
public:
FileStream (FILE* file, const std::string& name = "file")
: file(file), lineNumber(1), colNumber(0), charNumber(0), name(std::shared_ptr<std::string>(new std::string(name))) {}
FileStream (const FileName& fileName)
: lineNumber(1), colNumber(0), charNumber(0), name(std::shared_ptr<std::string>(new std::string(fileName.str())))
{
file = fopen(fileName.c_str(),"r");
if (file == nullptr) THROW_RUNTIME_ERROR("cannot open file " + fileName.str());
}
~FileStream() { if (file) fclose(file); }
public:
ParseLocation location() {
return ParseLocation(name,lineNumber,colNumber,charNumber);
}
int next() {
int c = fgetc(file);
if (c == '\n') { lineNumber++; colNumber = 0; } else if (c != '\r') colNumber++;
charNumber++;
return c;
}
private:
FILE* file;
ssize_t lineNumber; /// the line number the token is from
ssize_t colNumber; /// the character number in the current line
ssize_t charNumber; /// the character in the file
std::shared_ptr<std::string> name; /// name of buffer
};
/*! creates a stream from a string */
class StrStream : public Stream<int>
{
public:
StrStream (const char* str)
: str(str), lineNumber(1), colNumber(0), charNumber(0) {}
public:
ParseLocation location() {
return ParseLocation(std::shared_ptr<std::string>(),lineNumber,colNumber,charNumber);
}
int next() {
int c = str[charNumber];
if (c == 0) return EOF;
if (c == '\n') { lineNumber++; colNumber = 0; } else if (c != '\r') colNumber++;
charNumber++;
return c;
}
private:
const char* str;
ssize_t lineNumber; /// the line number the token is from
ssize_t colNumber; /// the character number in the current line
ssize_t charNumber; /// the character in the file
};
/*! creates a character stream from a command line */
class CommandLineStream : public Stream<int>
{
public:
CommandLineStream (int argc, char** argv, const std::string& name = "command line")
: i(0), j(0), charNumber(0), name(std::shared_ptr<std::string>(new std::string(name)))
{
if (argc > 0) {
for (size_t i=0; argv[0][i] && i<1024; i++) charNumber++;
charNumber++;
}
for (ssize_t k=1; k<argc; k++) args.push_back(argv[k]);
}
~CommandLineStream() {}
public:
ParseLocation location() {
return ParseLocation(name,0,charNumber,charNumber);
}
int next() {
if (i == args.size()) return EOF;
if (j == args[i].size()) { i++; j=0; charNumber++; return ' '; }
charNumber++;
return args[i][j++];
}
private:
size_t i,j;
std::vector<std::string> args;
ssize_t charNumber; /// the character in the file
std::shared_ptr<std::string> name; /// name of buffer
};
}
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