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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_GN_VALUE_EXTRACTORS_H_
      6 #define TOOLS_GN_VALUE_EXTRACTORS_H_
      7 
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "tools/gn/target.h"
     12 #include "tools/gn/value.h"
     13 
     14 class BuildSettings;
     15 class Err;
     16 class Label;
     17 class SourceDir;
     18 class SourceFile;
     19 
     20 // Sets the error and returns false on failure.
     21 template<typename T, class Converter>
     22 bool ListValueExtractor(const Value& value, std::vector<T>* dest,
     23                         Err* err,
     24                         const Converter& converter) {
     25   if (!value.VerifyTypeIs(Value::LIST, err))
     26     return false;
     27   const std::vector<Value>& input_list = value.list_value();
     28   dest->resize(input_list.size());
     29   for (size_t i = 0; i < input_list.size(); i++) {
     30     if (!converter(input_list[i], &(*dest)[i], err))
     31       return false;
     32   }
     33   return true;
     34 }
     35 
     36 // On failure, returns false and sets the error.
     37 bool ExtractListOfStringValues(const Value& value,
     38                                std::vector<std::string>* dest,
     39                                Err* err);
     40 
     41 // Looks for a list of source files relative to a given current dir.
     42 bool ExtractListOfRelativeFiles(const BuildSettings* build_settings,
     43                                 const Value& value,
     44                                 const SourceDir& current_dir,
     45                                 std::vector<SourceFile>* files,
     46                                 Err* err);
     47 
     48 // Looks for a list of source directories relative to a given current dir.
     49 bool ExtractListOfRelativeDirs(const BuildSettings* build_settings,
     50                                const Value& value,
     51                                const SourceDir& current_dir,
     52                                std::vector<SourceDir>* dest,
     53                                Err* err);
     54 
     55 // Extracts the list of labels and their origins to the given vector. Only the
     56 // labels are filled in, the ptr for each pair in the vector will be null.
     57 bool ExtractListOfLabels(const Value& value,
     58                          const SourceDir& current_dir,
     59                          const Label& current_toolchain,
     60                          LabelConfigVector* dest,
     61                          Err* err);
     62 bool ExtractListOfLabels(const Value& value,
     63                          const SourceDir& current_dir,
     64                          const Label& current_toolchain,
     65                          LabelTargetVector* dest,
     66                          Err* err);
     67 
     68 bool ExtractRelativeFile(const BuildSettings* build_settings,
     69                          const Value& value,
     70                          const SourceDir& current_dir,
     71                          SourceFile* file,
     72                          Err* err);
     73 
     74 #endif  // TOOLS_GN_VALUE_EXTRACTORS_H_
     75