GUECS: Minimal components from zedcaster that will let me make a GUI for a game.

lel_parser.rl

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+/***** !!!!!! THIS IS INCLUDED BY lel.cpp DO NOT PUT IN BUILD!!!!!! ******/
+
+#include "lel.hpp"
+#include <fmt/core.h>
+#include <iostream>
+
+namespace lel {
+
+%%{
+  machine Parser;
+  alphtype char;
+
+  action token {tk = input.substr(start - begin, fpc - start); }
+
+  action col {}
+  action ltab { grid.push_back(Row()); }
+  action valign { cur.bottom = fc == '.'; }
+  action id { id(input.substr(start - begin, fpc - start)); }
+  action row { cur.col = 0; cur.row++; }
+  action align { cur.right = fc == '>'; }
+  action setwidth {cur.max_w = std::stoi(tk); }
+  action setheight { cur.max_h = std::stoi(tk); }
+  action expand { cur.expand = true; }
+  action center { cur.center = true; }
+  action percent { cur.percent = true; }
+
+  col = "|" $col;
+  ltab = "[" $ltab;
+  rtab = "]" $row;
+  valign = ("^" | ".") $valign;
+  expand = "*" $expand;
+  center = "=" $center;
+  percent = "%" $percent;
+  halign = ("<" | ">") $align;
+  number =  digit+ >{ start = fpc; } %token;
+  setw = ("(" number %setwidth ("," number %setheight)? ")") ;
+  modifiers = (percent | center | expand | valign | halign | setw);
+  id = modifiers* ((alpha | '_')+ :>> (alnum | '_')*) >{start = fpc;} %id;
+  row = space* ltab space* id space* (col space* id space*)* space* rtab space*;
+
+  main := row+;
+}%%
+
+%% write data;
+
+bool Parser::parse(std::string input) {
+  reset();
+  int cs = 0;
+  const char *start = nullptr;
+  const char *begin = input.data();
+  const char *p = input.data();
+  const char *pe = p + input.size();
+  std::string tk;
+
+  %% write init;
+  %% write exec;
+
+  bool good = pe - p == 0;
+  if(good) {
+    finalize();
+  } else {
+    dbc::log("error at:");
+    std::cout << p;
+  }
+  return good;
+}
+
+}