qcsrc/lib/markdown.qh

   1 #include "test.qh"
   2
   3 /**
   4  * handle string spacing as markdown:
   5  *   - two spaces escape a linebreak (otherwise text wraps)
   6  *   - two linebreaks become a paragraph (remain unchanged)
   7  */
   8 string markdown(string s)
   9 {
  10         string buf = "";
  11         int lines = 0;
  12         int spaces = 0;
  13         FOREACH_CHAR(s, true, {
  14                 switch (it) {
  15                         default:
  16                                 for (; spaces > 0; --spaces) {
  17                                         buf = strcat(buf, " ");
  18                                 }
  19                                 buf = strcat(buf, chr2str(it));
  20                                 break;
  21                         case ' ':
  22                                 spaces += 1;
  23                                 break;
  24                         case '\n':
  25                                 lines += 1;
  26                                 if (lines > 1) {
  27                                         lines = 0;
  28                                         spaces = 0;
  29                                         buf = strcat(buf, "\n\n");
  30                                         break;
  31                                 }
  32                                 if (spaces < 2) {
  33                                         spaces = 1;
  34                                 } else {
  35                                         spaces = 0;
  36                                         buf = strcat(buf, "\n");
  37                                 }
  38                                 break;
  39                 }
  40         });
  41         return buf;
  42 }
  43
  44 TEST(Markdown, LineWrap)
  45 {
  46         #define X(expect, in) MACRO_BEGIN \
  47                 string out = markdown(in); \
  48                 EXPECT_TRUE(expect == out); \
  49                 LOG_INFO(expect); \
  50                 LOG_INFO(out); \
  51         MACRO_END
  52
  53         // identity
  54         X("lorem ipsum", "lorem ipsum");
  55         // trim trailing space
  56         X("lorem ipsum", "lorem ipsum ");
  57         // allow manual input wrapping
  58         X("lorem ipsum", "lorem\nipsum");
  59         // line break
  60         X("lorem\nipsum", "lorem  \nipsum");
  61         // paragraph
  62         X("lorem\n\nipsum", "lorem\n\nipsum");
  63         SUCCEED();
  64         #undef X
  65 }