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  1. #include <iostream>
  2. #include <string>
  3.  
  4. std::string unindent(const char* p)
  5. {
  6.     std::string result;
  7.     if (p[0] == '\n') ++p;
  8.     const char* p_leading = p;
  9.     while (std::isspace(*p) && *p != '\n')
  10.         ++p;
  11.     size_t leading_len = p - p_leading;
  12.     while (*p)
  13.     {
  14.         result += *p;
  15.         if (*p == '\n')
  16.         {
  17.             ++p;
  18.             for (size_t i = 0; i < leading_len; ++i)
  19.                 if (p[i] != p_leading[i])
  20.                     goto dont_skip_leading;
  21.             p += leading_len;
  22.         }
  23.         else
  24.             ++p;
  25.       dont_skip_leading: ;
  26.     }
  27.     return result;
  28. }
  29.  
  30.  
  31. int main() {
  32.     std::cout << "[[" << unindent(R"(
  33.         This is the first line.
  34.         This is the second line.
  35.         This is the third line.
  36.         )") << "]]\n";
  37.  
  38.     std::cout << "[[" << unindent(R"(
  39.         This is the first line.
  40.             This is the second line, now indented four more spaces.
  41.         This is the third line.
  42.   This is the fourth line, now indented 2 spaces, which is less than the first.
  43.         )") << "]]\n";
  44. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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[[This is the first line.
This is the second line.
This is the third line.
]]
[[This is the first line.
    This is the second line, now indented four more spaces.
This is the third line.
  This is the fourth line, now indented 2 spaces, which is less than the first.
]]
https://ideone.com/Fkb6Cd
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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