mongodb/pcre-7.4/pcre_scanner_unittest.cc

// Copyright (c) 2005, Google Inc.
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//
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// Author: Greg J. Badros
//
// Unittest for scanner, especially GetNextComments and GetComments()
// functionality.

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <string>
#include <vector>

#include "pcrecpp.h"
#include "pcre_stringpiece.h"
#include "pcre_scanner.h"

#define FLAGS_unittest_stack_size   49152

// Dies with a fatal error if the two values are not equal.
#define CHECK_EQ(a, b)  do {                                    \
  if ( (a) != (b) ) {                                           \
    fprintf(stderr, "%s:%d: Check failed because %s != %s\n",   \
            __FILE__, __LINE__, #a, #b);                        \
    exit(1);                                                    \
  }                                                             \
} while (0)

using std::vector;
using pcrecpp::StringPiece;
using pcrecpp::Scanner;

static void TestScanner() {
  const char input[] = "\n"
                       "alpha = 1; // this sets alpha\n"
                       "bravo = 2; // bravo is set here\n"
                       "gamma = 33; /* and here is gamma */\n";

  const char *re = "(\\w+) = (\\d+);";

  Scanner s(input);
  string var;
  int number;
  s.SkipCXXComments();
  s.set_save_comments(true);
  vector<StringPiece> comments;

  s.Consume(re, &var, &number);
  CHECK_EQ(var, "alpha");
  CHECK_EQ(number, 1);
  CHECK_EQ(s.LineNumber(), 3);
  s.GetNextComments(&comments);
  CHECK_EQ(comments.size(), 1);
  CHECK_EQ(comments[0].as_string(), " // this sets alpha\n");
  comments.resize(0);

  s.Consume(re, &var, &number);
  CHECK_EQ(var, "bravo");
  CHECK_EQ(number, 2);
  s.GetNextComments(&comments);
  CHECK_EQ(comments.size(), 1);
  CHECK_EQ(comments[0].as_string(), " // bravo is set here\n");
  comments.resize(0);

  s.Consume(re, &var, &number);
  CHECK_EQ(var, "gamma");
  CHECK_EQ(number, 33);
  s.GetNextComments(&comments);
  CHECK_EQ(comments.size(), 1);
  CHECK_EQ(comments[0].as_string(), " /* and here is gamma */\n");
  comments.resize(0);

  s.GetComments(0, sizeof(input), &comments);
  CHECK_EQ(comments.size(), 3);
  CHECK_EQ(comments[0].as_string(), " // this sets alpha\n");
  CHECK_EQ(comments[1].as_string(), " // bravo is set here\n");
  CHECK_EQ(comments[2].as_string(), " /* and here is gamma */\n");
  comments.resize(0);

  s.GetComments(0, strchr(input, '/') - input, &comments);
  CHECK_EQ(comments.size(), 0);
  comments.resize(0);

  s.GetComments(strchr(input, '/') - input - 1, sizeof(input),
                &comments);
  CHECK_EQ(comments.size(), 3);
  CHECK_EQ(comments[0].as_string(), " // this sets alpha\n");
  CHECK_EQ(comments[1].as_string(), " // bravo is set here\n");
  CHECK_EQ(comments[2].as_string(), " /* and here is gamma */\n");
  comments.resize(0);

  s.GetComments(strchr(input, '/') - input - 1,
                strchr(input + 1, '\n') - input + 1, &comments);
  CHECK_EQ(comments.size(), 1);
  CHECK_EQ(comments[0].as_string(), " // this sets alpha\n");
  comments.resize(0);
}

static void TestBigComment() {
  string input;
  for (int i = 0; i < 1024; ++i) {
    char buf[1024];  // definitely big enough
    sprintf(buf, "    # Comment %d\n", i);
    input += buf;
  }
  input += "name = value;\n";

  Scanner s(input.c_str());
  s.SetSkipExpression("\\s+|#.*\n");

  string name;
  string value;
  s.Consume("(\\w+) = (\\w+);", &name, &value);
  CHECK_EQ(name, "name");
  CHECK_EQ(value, "value");
}

// TODO: also test scanner and big-comment in a thread with a
//       small stack size

int main(int argc, char** argv) {
  TestScanner();
  TestBigComment();

  // Done
  printf("OK\n");

  return 0;
}