chrome/tools/profile_reset/jtl_compiler_frontend.cc

   1 // Copyright 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 // A simple command-line compiler for JTL (JSON Traversal Language).
   6 //
   7 // Translates rules from a text-based, human-readable format to an easy-to-parse
   8 // byte-code format, which then can be interpreted by JtlInterpreter.
   9 //
  10 // Example usage:
  11 //   jtl_compiler --input=blah.txt --hash-seed="foobar" --output=blah.dat
  12
  13 #include <iostream>
  14 #include <string>
  15
  16 #include "base/command_line.h"
  17 #include "base/files/file_path.h"
  18 #include "base/files/file_util.h"
  19 #include "chrome/tools/profile_reset/jtl_compiler.h"
  20
  21 namespace {
  22
  23 // Command-line argument name: path to the input text-based JTL source code.
  24 const char kInputPath[] = "input";
  25
  26 // Command-line argument name: path to the output byte-code.
  27 const char kOutputPath[] = "output";
  28
  29 // Command-line argument name: the hash seed to use.
  30 const char kHashSeed[] = "hash-seed";
  31
  32 // Error codes.
  33 const char kMismatchedDoubleQuotes[] = "Mismatched double-quotes before EOL.";
  34 const char kParsingError[] = "Parsing error. Input is ill-formed.";
  35 const char kArgumentCountError[] = "Wrong number of arguments for operation.";
  36 const char kArgumentTypeError[] = "Wrong argument type(s) for operation.";
  37 const char kArgumentValueError[] = "Wrong argument value(s) for operation.";
  38 const char kUnknownOperationError[] = "No operation by this name.";
  39 const char kUnknownError[] = "Unknown error.";
  40
  41 const char* ResolveErrorCode(JtlCompiler::CompileError::ErrorCode code) {
  42   switch (code) {
  43     case JtlCompiler::CompileError::MISMATCHED_DOUBLE_QUOTES:
  44       return kMismatchedDoubleQuotes;
  45     case JtlCompiler::CompileError::PARSING_ERROR:
  46       return kParsingError;
  47     case JtlCompiler::CompileError::INVALID_ARGUMENT_COUNT:
  48       return kArgumentCountError;
  49     case JtlCompiler::CompileError::INVALID_ARGUMENT_TYPE:
  50       return kArgumentTypeError;
  51     case JtlCompiler::CompileError::INVALID_ARGUMENT_VALUE:
  52       return kArgumentValueError;
  53     case JtlCompiler::CompileError::INVALID_OPERATION_NAME:
  54       return kUnknownOperationError;
  55     default:
  56       return kUnknownError;
  57   }
  58 }
  59
  60 }  // namespace
  61
  62 int main(int argc, char* argv[]) {
  63   CommandLine::Init(argc, argv);
  64   CommandLine* cmd_line = CommandLine::ForCurrentProcess();
  65   if (!cmd_line->HasSwitch(kInputPath) || !cmd_line->HasSwitch(kHashSeed) ||
  66       !cmd_line->HasSwitch(kOutputPath)) {
  67     std::cerr << "Usage: " << argv[0] << " <required switches>" << std::endl;
  68     std::cerr << "\nRequired switches are:" << std::endl;
  69     std::cerr << "  --" << kInputPath << "=<file>"
  70               << "\t\tPath to the input text-based JTL source code."
  71               << std::endl;
  72     std::cerr << "  --" << kOutputPath << "=<file>"
  73               << "\t\tPath to the output byte-code." << std::endl;
  74     std::cerr << "  --" << kHashSeed << "=<value>"
  75               << "\t\tThe hash seed to use." << std::endl;
  76     return -1;
  77   }
  78
  79   base::FilePath source_code_path =
  80       MakeAbsoluteFilePath(cmd_line->GetSwitchValuePath(kInputPath));
  81   std::string source_code;
  82   if (!base::ReadFileToString(source_code_path, &source_code)) {
  83     std::cerr << "ERROR: Cannot read input file." << std::endl;
  84     return -3;
  85   }
  86
  87   std::string bytecode;
  88   JtlCompiler::CompileError error;
  89   std::string hash_seed = cmd_line->GetSwitchValueASCII(kHashSeed);
  90   if (!JtlCompiler::Compile(source_code, hash_seed, &bytecode, &error)) {
  91     std::cerr << "COMPILE ERROR: " << ResolveErrorCode(error.error_code)
  92               << std::endl;
  93     std::cerr << "  Line number: " << (error.line_number + 1) << std::endl;
  94     std::cerr << "  Context: " << (error.context.size() > 63
  95                                        ? error.context.substr(0, 60) + "..."
  96                                        : error.context) << std::endl;
  97     return -2;
  98   }
  99
 100   base::FilePath bytecode_path =
 101       MakeAbsoluteFilePath(cmd_line->GetSwitchValuePath(kOutputPath));
 102   int bytes_written =
 103       base::WriteFile(cmd_line->GetSwitchValuePath(kOutputPath),
 104                            bytecode.data(),
 105                            static_cast<int>(bytecode.size()));
 106   if (bytes_written != static_cast<int>(bytecode.size())) {
 107     std::cerr << "ERROR: Cannot write output file." << std::endl;
 108     return -3;
 109   }
 110
 111   return 0;
 112 }