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-rw-r--r--thirdparty/embree/common/lexers/stream.h215
1 files changed, 215 insertions, 0 deletions
diff --git a/thirdparty/embree/common/lexers/stream.h b/thirdparty/embree/common/lexers/stream.h
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index 0000000000..a40c15f8eb
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+++ b/thirdparty/embree/common/lexers/stream.h
@@ -0,0 +1,215 @@
+// 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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