kc3-lang/angle/src/common/string_utils.h

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• Hash : 62742f9e
  Author :
  Date : 2019-05-01T16:14:50
  

  Vulkan: Optimize shader source macro replacement
  
  @@ LAYOUT-xx @@ and @@ QUALIFIER-xx @@ macros are generated by the
  compiler when emitting Vulkan GLSL.  These macros are replaced at link
  time in the Vulkan backend.
  
  Previously, this replacement was done through calls to
  angle::ReplaceSubstring, reiterating over the whole source on every
  replacement.  This CL does a prepass on the input source and chunks it
  up in blocks.  Search is optimized as only blocks of a certain type are
  string-compared (skipping large chunks of shader text).  Replace is
  optimized as the whole shader is not shifted left or right on every
  replacement.
  
  Additionally, this CL modifies the layout macro to the following format:
  
  	@@ LAYOUT-xx(extra, args) @@
  
  This is used in a follow up CL to have the compiler provide additional
  layout qualifiers.
  
  Bug: angleproject:3220
  Change-Id: I6367e781c3304d5f2e0a406e4fb4e6feb4c45f1d
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1592070
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
  

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• src/common/string_utils.h

• //
  // Copyright 2015 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // string_utils:
  //   String helper functions.
  //
  
  #ifndef LIBANGLE_STRING_UTILS_H_
  #define LIBANGLE_STRING_UTILS_H_
  
  #include <string>
  #include <vector>
  
  #include "common/Optional.h"
  
  namespace angle
  {
  
  extern const char kWhitespaceASCII[];
  
  enum WhitespaceHandling
  {
      KEEP_WHITESPACE,
      TRIM_WHITESPACE,
  };
  
  enum SplitResult
  {
      SPLIT_WANT_ALL,
      SPLIT_WANT_NONEMPTY,
  };
  
  std::vector<std::string> SplitString(const std::string &input,
                                       const std::string &delimiters,
                                       WhitespaceHandling whitespace,
                                       SplitResult resultType);
  
  void SplitStringAlongWhitespace(const std::string &input, std::vector<std::string> *tokensOut);
  
  std::string TrimString(const std::string &input, const std::string &trimChars);
  
  // Return the substring starting at offset and up to the first occurance of the |delimeter|.
  std::string GetPrefix(const std::string &input, size_t offset, const char *delimiter);
  std::string GetPrefix(const std::string &input, size_t offset, char delimiter);
  
  bool HexStringToUInt(const std::string &input, unsigned int *uintOut);
  
  bool ReadFileToString(const std::string &path, std::string *stringOut);
  
  Optional<std::vector<wchar_t>> WidenString(size_t length, const char *cString);
  
  // Check if the string str begins with the given prefix.
  // The comparison is case sensitive.
  bool BeginsWith(const std::string &str, const std::string &prefix);
  
  // Check if the string str begins with the given prefix.
  // Prefix may not be NULL and needs to be NULL terminated.
  // The comparison is case sensitive.
  bool BeginsWith(const std::string &str, const char *prefix);
  
  // Check if the string str begins with the given prefix.
  // str and prefix may not be NULL and need to be NULL terminated.
  // The comparison is case sensitive.
  bool BeginsWith(const char *str, const char *prefix);
  
  // Check if the string str begins with the first prefixLength characters of the given prefix.
  // The length of the prefix string should be greater than or equal to prefixLength.
  // The comparison is case sensitive.
  bool BeginsWith(const std::string &str, const std::string &prefix, const size_t prefixLength);
  
  // Check if the string str ends with the given suffix.
  // Suffix may not be NUL and needs to be NULL terminated.
  // The comparison is case sensitive.
  bool EndsWith(const std::string &str, const char *suffix);
  
  // Convert to lower-case.
  void ToLower(std::string *str);
  
  // Replaces the substring 'substring' in 'str' with 'replacement'. Returns true if successful.
  bool ReplaceSubstring(std::string *str,
                        const std::string &substring,
                        const std::string &replacement);
  
  }  // namespace angle
  
  #endif  // LIBANGLE_STRING_UTILS_H_
  

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