diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2a210dd..64435886 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ Released: TBD
   from the `options.grammarSource` property. That property can contain arbitrary
   data,for example, path to the currently parsed file.
   [@Mingun](https://github.com/peggyjs/peggy/pull/95)
+- Several optimizations in the generator. Generated parsers now faster and smaller
+  [@Mingun](https://github.com/peggyjs/peggy/pull/118)
 
 ### Bug fixes
 
diff --git a/lib/parser.js b/lib/parser.js
index 7ffbe47e..e0226534 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -677,98 +677,63 @@ function peg$parse(input, options) {
 
     s0 = peg$currPos;
     s1 = peg$parse__();
-    if (s1 !== peg$FAILED) {
-      s2 = peg$currPos;
-      s3 = peg$parseTopLevelInitializer();
-      if (s3 !== peg$FAILED) {
-        s4 = peg$parse__();
-        if (s4 !== peg$FAILED) {
-          s3 = [s3, s4];
-          s2 = s3;
-        } else {
-          peg$currPos = s2;
-          s2 = peg$FAILED;
-        }
-      } else {
-        peg$currPos = s2;
-        s2 = peg$FAILED;
-      }
-      if (s2 === peg$FAILED) {
-        s2 = null;
-      }
-      if (s2 !== peg$FAILED) {
-        s3 = peg$currPos;
-        s4 = peg$parseInitializer();
-        if (s4 !== peg$FAILED) {
-          s5 = peg$parse__();
-          if (s5 !== peg$FAILED) {
-            s4 = [s4, s5];
-            s3 = s4;
-          } else {
-            peg$currPos = s3;
-            s3 = peg$FAILED;
-          }
-        } else {
-          peg$currPos = s3;
-          s3 = peg$FAILED;
-        }
-        if (s3 === peg$FAILED) {
-          s3 = null;
-        }
-        if (s3 !== peg$FAILED) {
-          s4 = [];
-          s5 = peg$currPos;
-          s6 = peg$parseRule();
-          if (s6 !== peg$FAILED) {
-            s7 = peg$parse__();
-            if (s7 !== peg$FAILED) {
-              s6 = [s6, s7];
-              s5 = s6;
-            } else {
-              peg$currPos = s5;
-              s5 = peg$FAILED;
-            }
-          } else {
-            peg$currPos = s5;
-            s5 = peg$FAILED;
-          }
-          if (s5 !== peg$FAILED) {
-            while (s5 !== peg$FAILED) {
-              s4.push(s5);
-              s5 = peg$currPos;
-              s6 = peg$parseRule();
-              if (s6 !== peg$FAILED) {
-                s7 = peg$parse__();
-                if (s7 !== peg$FAILED) {
-                  s6 = [s6, s7];
-                  s5 = s6;
-                } else {
-                  peg$currPos = s5;
-                  s5 = peg$FAILED;
-                }
-              } else {
-                peg$currPos = s5;
-                s5 = peg$FAILED;
-              }
-            }
-          } else {
-            s4 = peg$FAILED;
-          }
-          if (s4 !== peg$FAILED) {
-            peg$savedPos = s0;
-            s0 = peg$c0(s2, s3, s4);
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
+    s2 = peg$currPos;
+    s3 = peg$parseTopLevelInitializer();
+    if (s3 !== peg$FAILED) {
+      s4 = peg$parse__();
+      s3 = [s3, s4];
+      s2 = s3;
+    } else {
+      peg$currPos = s2;
+      s2 = peg$FAILED;
+    }
+    if (s2 === peg$FAILED) {
+      s2 = null;
+    }
+    s3 = peg$currPos;
+    s4 = peg$parseInitializer();
+    if (s4 !== peg$FAILED) {
+      s5 = peg$parse__();
+      s4 = [s4, s5];
+      s3 = s4;
+    } else {
+      peg$currPos = s3;
+      s3 = peg$FAILED;
+    }
+    if (s3 === peg$FAILED) {
+      s3 = null;
+    }
+    s4 = [];
+    s5 = peg$currPos;
+    s6 = peg$parseRule();
+    if (s6 !== peg$FAILED) {
+      s7 = peg$parse__();
+      s6 = [s6, s7];
+      s5 = s6;
+    } else {
+      peg$currPos = s5;
+      s5 = peg$FAILED;
+    }
+    if (s5 !== peg$FAILED) {
+      while (s5 !== peg$FAILED) {
+        s4.push(s5);
+        s5 = peg$currPos;
+        s6 = peg$parseRule();
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parse__();
+          s6 = [s6, s7];
+          s5 = s6;
         } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
+          peg$currPos = s5;
+          s5 = peg$FAILED;
         }
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
       }
+    } else {
+      s4 = peg$FAILED;
+    }
+    if (s4 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s0 = peg$c0(s2, s3, s4);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -852,54 +817,34 @@ function peg$parse(input, options) {
     s1 = peg$parseIdentifierName();
     if (s1 !== peg$FAILED) {
       s2 = peg$parse__();
-      if (s2 !== peg$FAILED) {
-        s3 = peg$currPos;
-        s4 = peg$parseStringLiteral();
-        if (s4 !== peg$FAILED) {
-          s5 = peg$parse__();
-          if (s5 !== peg$FAILED) {
-            s4 = [s4, s5];
-            s3 = s4;
-          } else {
-            peg$currPos = s3;
-            s3 = peg$FAILED;
-          }
-        } else {
-          peg$currPos = s3;
-          s3 = peg$FAILED;
-        }
-        if (s3 === peg$FAILED) {
-          s3 = null;
-        }
-        if (s3 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 61) {
-            s4 = peg$c7;
-            peg$currPos++;
-          } else {
-            s4 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c8); }
-          }
-          if (s4 !== peg$FAILED) {
-            s5 = peg$parse__();
-            if (s5 !== peg$FAILED) {
-              s6 = peg$parseChoiceExpression();
-              if (s6 !== peg$FAILED) {
-                s7 = peg$parseEOS();
-                if (s7 !== peg$FAILED) {
-                  peg$savedPos = s0;
-                  s0 = peg$c9(s1, s3, s6);
-                } else {
-                  peg$currPos = s0;
-                  s0 = peg$FAILED;
-                }
-              } else {
-                peg$currPos = s0;
-                s0 = peg$FAILED;
-              }
-            } else {
-              peg$currPos = s0;
-              s0 = peg$FAILED;
-            }
+      s3 = peg$currPos;
+      s4 = peg$parseStringLiteral();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parse__();
+        s4 = [s4, s5];
+        s3 = s4;
+      } else {
+        peg$currPos = s3;
+        s3 = peg$FAILED;
+      }
+      if (s3 === peg$FAILED) {
+        s3 = null;
+      }
+      if (input.charCodeAt(peg$currPos) === 61) {
+        s4 = peg$c7;
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c8); }
+      }
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parse__();
+        s6 = peg$parseChoiceExpression();
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parseEOS();
+          if (s7 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$c9(s1, s3, s6);
           } else {
             peg$currPos = s0;
             s0 = peg$FAILED;
@@ -929,29 +874,19 @@ function peg$parse(input, options) {
       s2 = [];
       s3 = peg$currPos;
       s4 = peg$parse__();
-      if (s4 !== peg$FAILED) {
-        if (input.charCodeAt(peg$currPos) === 47) {
-          s5 = peg$c10;
-          peg$currPos++;
-        } else {
-          s5 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c11); }
-        }
-        if (s5 !== peg$FAILED) {
-          s6 = peg$parse__();
-          if (s6 !== peg$FAILED) {
-            s7 = peg$parseActionExpression();
-            if (s7 !== peg$FAILED) {
-              s4 = [s4, s5, s6, s7];
-              s3 = s4;
-            } else {
-              peg$currPos = s3;
-              s3 = peg$FAILED;
-            }
-          } else {
-            peg$currPos = s3;
-            s3 = peg$FAILED;
-          }
+      if (input.charCodeAt(peg$currPos) === 47) {
+        s5 = peg$c10;
+        peg$currPos++;
+      } else {
+        s5 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c11); }
+      }
+      if (s5 !== peg$FAILED) {
+        s6 = peg$parse__();
+        s7 = peg$parseActionExpression();
+        if (s7 !== peg$FAILED) {
+          s4 = [s4, s5, s6, s7];
+          s3 = s4;
         } else {
           peg$currPos = s3;
           s3 = peg$FAILED;
@@ -964,29 +899,19 @@ function peg$parse(input, options) {
         s2.push(s3);
         s3 = peg$currPos;
         s4 = peg$parse__();
-        if (s4 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 47) {
-            s5 = peg$c10;
-            peg$currPos++;
-          } else {
-            s5 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c11); }
-          }
-          if (s5 !== peg$FAILED) {
-            s6 = peg$parse__();
-            if (s6 !== peg$FAILED) {
-              s7 = peg$parseActionExpression();
-              if (s7 !== peg$FAILED) {
-                s4 = [s4, s5, s6, s7];
-                s3 = s4;
-              } else {
-                peg$currPos = s3;
-                s3 = peg$FAILED;
-              }
-            } else {
-              peg$currPos = s3;
-              s3 = peg$FAILED;
-            }
+        if (input.charCodeAt(peg$currPos) === 47) {
+          s5 = peg$c10;
+          peg$currPos++;
+        } else {
+          s5 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c11); }
+        }
+        if (s5 !== peg$FAILED) {
+          s6 = peg$parse__();
+          s7 = peg$parseActionExpression();
+          if (s7 !== peg$FAILED) {
+            s4 = [s4, s5, s6, s7];
+            s3 = s4;
           } else {
             peg$currPos = s3;
             s3 = peg$FAILED;
@@ -996,13 +921,8 @@ function peg$parse(input, options) {
           s3 = peg$FAILED;
         }
       }
-      if (s2 !== peg$FAILED) {
-        peg$savedPos = s0;
-        s0 = peg$c12(s1, s2);
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      peg$savedPos = s0;
+      s0 = peg$c12(s1, s2);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -1019,15 +939,10 @@ function peg$parse(input, options) {
     if (s1 !== peg$FAILED) {
       s2 = peg$currPos;
       s3 = peg$parse__();
-      if (s3 !== peg$FAILED) {
-        s4 = peg$parseCodeBlock();
-        if (s4 !== peg$FAILED) {
-          s3 = [s3, s4];
-          s2 = s3;
-        } else {
-          peg$currPos = s2;
-          s2 = peg$FAILED;
-        }
+      s4 = peg$parseCodeBlock();
+      if (s4 !== peg$FAILED) {
+        s3 = [s3, s4];
+        s2 = s3;
       } else {
         peg$currPos = s2;
         s2 = peg$FAILED;
@@ -1035,13 +950,8 @@ function peg$parse(input, options) {
       if (s2 === peg$FAILED) {
         s2 = null;
       }
-      if (s2 !== peg$FAILED) {
-        peg$savedPos = s0;
-        s0 = peg$c13(s1, s2);
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      peg$savedPos = s0;
+      s0 = peg$c13(s1, s2);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -1059,15 +969,10 @@ function peg$parse(input, options) {
       s2 = [];
       s3 = peg$currPos;
       s4 = peg$parse__();
-      if (s4 !== peg$FAILED) {
-        s5 = peg$parseLabeledExpression();
-        if (s5 !== peg$FAILED) {
-          s4 = [s4, s5];
-          s3 = s4;
-        } else {
-          peg$currPos = s3;
-          s3 = peg$FAILED;
-        }
+      s5 = peg$parseLabeledExpression();
+      if (s5 !== peg$FAILED) {
+        s4 = [s4, s5];
+        s3 = s4;
       } else {
         peg$currPos = s3;
         s3 = peg$FAILED;
@@ -1076,27 +981,17 @@ function peg$parse(input, options) {
         s2.push(s3);
         s3 = peg$currPos;
         s4 = peg$parse__();
-        if (s4 !== peg$FAILED) {
-          s5 = peg$parseLabeledExpression();
-          if (s5 !== peg$FAILED) {
-            s4 = [s4, s5];
-            s3 = s4;
-          } else {
-            peg$currPos = s3;
-            s3 = peg$FAILED;
-          }
+        s5 = peg$parseLabeledExpression();
+        if (s5 !== peg$FAILED) {
+          s4 = [s4, s5];
+          s3 = s4;
         } else {
           peg$currPos = s3;
           s3 = peg$FAILED;
         }
       }
-      if (s2 !== peg$FAILED) {
-        peg$savedPos = s0;
-        s0 = peg$c14(s1, s2);
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      peg$savedPos = s0;
+      s0 = peg$c14(s1, s2);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -1121,15 +1016,10 @@ function peg$parse(input, options) {
       if (s2 === peg$FAILED) {
         s2 = null;
       }
-      if (s2 !== peg$FAILED) {
-        s3 = peg$parsePrefixedExpression();
-        if (s3 !== peg$FAILED) {
-          peg$savedPos = s0;
-          s0 = peg$c17(s2, s3);
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      s3 = peg$parsePrefixedExpression();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$c17(s2, s3);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1143,15 +1033,10 @@ function peg$parse(input, options) {
       s1 = peg$parseLabelColon();
       if (s1 !== peg$FAILED) {
         s2 = peg$parse__();
-        if (s2 !== peg$FAILED) {
-          s3 = peg$parsePrefixedExpression();
-          if (s3 !== peg$FAILED) {
-            peg$savedPos = s0;
-            s0 = peg$c18(s1, s3);
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
+        s3 = peg$parsePrefixedExpression();
+        if (s3 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$c18(s1, s3);
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;
@@ -1175,20 +1060,15 @@ function peg$parse(input, options) {
     s1 = peg$parseIdentifier();
     if (s1 !== peg$FAILED) {
       s2 = peg$parse__();
-      if (s2 !== peg$FAILED) {
-        if (input.charCodeAt(peg$currPos) === 58) {
-          s3 = peg$c19;
-          peg$currPos++;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c20); }
-        }
-        if (s3 !== peg$FAILED) {
-          s0 = s1;
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      if (input.charCodeAt(peg$currPos) === 58) {
+        s3 = peg$c19;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c20); }
+      }
+      if (s3 !== peg$FAILED) {
+        s0 = s1;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1208,15 +1088,10 @@ function peg$parse(input, options) {
     s1 = peg$parsePrefixedOperator();
     if (s1 !== peg$FAILED) {
       s2 = peg$parse__();
-      if (s2 !== peg$FAILED) {
-        s3 = peg$parseSuffixedExpression();
-        if (s3 !== peg$FAILED) {
-          peg$savedPos = s0;
-          s0 = peg$c21(s1, s3);
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      s3 = peg$parseSuffixedExpression();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$c21(s1, s3);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1271,15 +1146,10 @@ function peg$parse(input, options) {
     s1 = peg$parsePrimaryExpression();
     if (s1 !== peg$FAILED) {
       s2 = peg$parse__();
-      if (s2 !== peg$FAILED) {
-        s3 = peg$parseSuffixedOperator();
-        if (s3 !== peg$FAILED) {
-          peg$savedPos = s0;
-          s0 = peg$c28(s1, s3);
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      s3 = peg$parseSuffixedOperator();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$c28(s1, s3);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1350,29 +1220,19 @@ function peg$parse(input, options) {
               }
               if (s1 !== peg$FAILED) {
                 s2 = peg$parse__();
-                if (s2 !== peg$FAILED) {
-                  s3 = peg$parseChoiceExpression();
-                  if (s3 !== peg$FAILED) {
-                    s4 = peg$parse__();
-                    if (s4 !== peg$FAILED) {
-                      if (input.charCodeAt(peg$currPos) === 41) {
-                        s5 = peg$c37;
-                        peg$currPos++;
-                      } else {
-                        s5 = peg$FAILED;
-                        if (peg$silentFails === 0) { peg$fail(peg$c38); }
-                      }
-                      if (s5 !== peg$FAILED) {
-                        peg$savedPos = s0;
-                        s0 = peg$c39(s3);
-                      } else {
-                        peg$currPos = s0;
-                        s0 = peg$FAILED;
-                      }
-                    } else {
-                      peg$currPos = s0;
-                      s0 = peg$FAILED;
-                    }
+                s3 = peg$parseChoiceExpression();
+                if (s3 !== peg$FAILED) {
+                  s4 = peg$parse__();
+                  if (input.charCodeAt(peg$currPos) === 41) {
+                    s5 = peg$c37;
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c38); }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    peg$savedPos = s0;
+                    s0 = peg$c39(s3);
                   } else {
                     peg$currPos = s0;
                     s0 = peg$FAILED;
@@ -1404,44 +1264,29 @@ function peg$parse(input, options) {
       peg$silentFails++;
       s3 = peg$currPos;
       s4 = peg$parse__();
-      if (s4 !== peg$FAILED) {
-        s5 = peg$currPos;
-        s6 = peg$parseStringLiteral();
-        if (s6 !== peg$FAILED) {
-          s7 = peg$parse__();
-          if (s7 !== peg$FAILED) {
-            s6 = [s6, s7];
-            s5 = s6;
-          } else {
-            peg$currPos = s5;
-            s5 = peg$FAILED;
-          }
-        } else {
-          peg$currPos = s5;
-          s5 = peg$FAILED;
-        }
-        if (s5 === peg$FAILED) {
-          s5 = null;
-        }
-        if (s5 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 61) {
-            s6 = peg$c7;
-            peg$currPos++;
-          } else {
-            s6 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c8); }
-          }
-          if (s6 !== peg$FAILED) {
-            s4 = [s4, s5, s6];
-            s3 = s4;
-          } else {
-            peg$currPos = s3;
-            s3 = peg$FAILED;
-          }
-        } else {
-          peg$currPos = s3;
-          s3 = peg$FAILED;
-        }
+      s5 = peg$currPos;
+      s6 = peg$parseStringLiteral();
+      if (s6 !== peg$FAILED) {
+        s7 = peg$parse__();
+        s6 = [s6, s7];
+        s5 = s6;
+      } else {
+        peg$currPos = s5;
+        s5 = peg$FAILED;
+      }
+      if (s5 === peg$FAILED) {
+        s5 = null;
+      }
+      if (input.charCodeAt(peg$currPos) === 61) {
+        s6 = peg$c7;
+        peg$currPos++;
+      } else {
+        s6 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c8); }
+      }
+      if (s6 !== peg$FAILED) {
+        s4 = [s4, s5, s6];
+        s3 = s4;
       } else {
         peg$currPos = s3;
         s3 = peg$FAILED;
@@ -1475,15 +1320,10 @@ function peg$parse(input, options) {
     s1 = peg$parseSemanticPredicateOperator();
     if (s1 !== peg$FAILED) {
       s2 = peg$parse__();
-      if (s2 !== peg$FAILED) {
-        s3 = peg$parseCodeBlock();
-        if (s3 !== peg$FAILED) {
-          peg$savedPos = s0;
-          s0 = peg$c41(s1, s3);
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      s3 = peg$parseCodeBlock();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$c41(s1, s3);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1764,21 +1604,16 @@ function peg$parse(input, options) {
           s3 = peg$FAILED;
         }
       }
-      if (s2 !== peg$FAILED) {
-        if (input.substr(peg$currPos, 2) === peg$c72) {
-          s3 = peg$c72;
-          peg$currPos += 2;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c73); }
-        }
-        if (s3 !== peg$FAILED) {
-          s1 = [s1, s2, s3];
-          s0 = s1;
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      if (input.substr(peg$currPos, 2) === peg$c72) {
+        s3 = peg$c72;
+        peg$currPos += 2;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c73); }
+      }
+      if (s3 !== peg$FAILED) {
+        s1 = [s1, s2, s3];
+        s0 = s1;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1873,21 +1708,16 @@ function peg$parse(input, options) {
           s3 = peg$FAILED;
         }
       }
-      if (s2 !== peg$FAILED) {
-        if (input.substr(peg$currPos, 2) === peg$c72) {
-          s3 = peg$c72;
-          peg$currPos += 2;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c73); }
-        }
-        if (s3 !== peg$FAILED) {
-          s1 = [s1, s2, s3];
-          s0 = s1;
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      if (input.substr(peg$currPos, 2) === peg$c72) {
+        s3 = peg$c72;
+        peg$currPos += 2;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c73); }
+      }
+      if (s3 !== peg$FAILED) {
+        s1 = [s1, s2, s3];
+        s0 = s1;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -1964,13 +1794,8 @@ function peg$parse(input, options) {
           s3 = peg$FAILED;
         }
       }
-      if (s2 !== peg$FAILED) {
-        s1 = [s1, s2];
-        s0 = s1;
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      s1 = [s1, s2];
+      s0 = s1;
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -2022,13 +1847,8 @@ function peg$parse(input, options) {
         s2.push(s3);
         s3 = peg$parseIdentifierPart();
       }
-      if (s2 !== peg$FAILED) {
-        peg$savedPos = s0;
-        s0 = peg$c77(s1, s2);
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      peg$savedPos = s0;
+      s0 = peg$c77(s1, s2);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -2314,13 +2134,8 @@ function peg$parse(input, options) {
       if (s2 === peg$FAILED) {
         s2 = null;
       }
-      if (s2 !== peg$FAILED) {
-        peg$savedPos = s0;
-        s0 = peg$c90(s1, s2);
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+      peg$savedPos = s0;
+      s0 = peg$c90(s1, s2);
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -2353,21 +2168,16 @@ function peg$parse(input, options) {
         s2.push(s3);
         s3 = peg$parseDoubleStringCharacter();
       }
-      if (s2 !== peg$FAILED) {
-        if (input.charCodeAt(peg$currPos) === 34) {
-          s3 = peg$c92;
-          peg$currPos++;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c93); }
-        }
-        if (s3 !== peg$FAILED) {
-          peg$savedPos = s0;
-          s0 = peg$c94(s2);
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      if (input.charCodeAt(peg$currPos) === 34) {
+        s3 = peg$c92;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c93); }
+      }
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$c94(s2);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -2392,21 +2202,16 @@ function peg$parse(input, options) {
           s2.push(s3);
           s3 = peg$parseSingleStringCharacter();
         }
-        if (s2 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 39) {
-            s3 = peg$c95;
-            peg$currPos++;
-          } else {
-            s3 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c96); }
-          }
-          if (s3 !== peg$FAILED) {
-            peg$savedPos = s0;
-            s0 = peg$c94(s2);
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
+        if (input.charCodeAt(peg$currPos) === 39) {
+          s3 = peg$c95;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c96); }
+        }
+        if (s3 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$c94(s2);
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;
@@ -2598,53 +2403,38 @@ function peg$parse(input, options) {
       if (s2 === peg$FAILED) {
         s2 = null;
       }
-      if (s2 !== peg$FAILED) {
-        s3 = [];
+      s3 = [];
+      s4 = peg$parseClassCharacterRange();
+      if (s4 === peg$FAILED) {
+        s4 = peg$parseClassCharacter();
+      }
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
         s4 = peg$parseClassCharacterRange();
         if (s4 === peg$FAILED) {
           s4 = peg$parseClassCharacter();
         }
-        while (s4 !== peg$FAILED) {
-          s3.push(s4);
-          s4 = peg$parseClassCharacterRange();
-          if (s4 === peg$FAILED) {
-            s4 = peg$parseClassCharacter();
-          }
-        }
-        if (s3 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 93) {
-            s4 = peg$c103;
-            peg$currPos++;
-          } else {
-            s4 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c104); }
-          }
-          if (s4 !== peg$FAILED) {
-            if (input.charCodeAt(peg$currPos) === 105) {
-              s5 = peg$c88;
-              peg$currPos++;
-            } else {
-              s5 = peg$FAILED;
-              if (peg$silentFails === 0) { peg$fail(peg$c89); }
-            }
-            if (s5 === peg$FAILED) {
-              s5 = null;
-            }
-            if (s5 !== peg$FAILED) {
-              peg$savedPos = s0;
-              s0 = peg$c105(s2, s3, s5);
-            } else {
-              peg$currPos = s0;
-              s0 = peg$FAILED;
-            }
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
+      }
+      if (input.charCodeAt(peg$currPos) === 93) {
+        s4 = peg$c103;
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c104); }
+      }
+      if (s4 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 105) {
+          s5 = peg$c88;
+          peg$currPos++;
         } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
+          s5 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c89); }
+        }
+        if (s5 === peg$FAILED) {
+          s5 = null;
         }
+        peg$savedPos = s0;
+        s0 = peg$c105(s2, s3, s5);
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -3210,20 +3000,15 @@ function peg$parse(input, options) {
     }
     if (s1 !== peg$FAILED) {
       s2 = peg$parseCode();
-      if (s2 !== peg$FAILED) {
-        if (input.charCodeAt(peg$currPos) === 125) {
-          s3 = peg$c3;
-          peg$currPos++;
-        } else {
-          s3 = peg$FAILED;
-          if (peg$silentFails === 0) { peg$fail(peg$c4); }
-        }
-        if (s3 !== peg$FAILED) {
-          s0 = s2;
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      if (input.charCodeAt(peg$currPos) === 125) {
+        s3 = peg$c3;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c4); }
+      }
+      if (s3 !== peg$FAILED) {
+        s0 = s2;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -3325,21 +3110,16 @@ function peg$parse(input, options) {
       }
       if (s3 !== peg$FAILED) {
         s4 = peg$parseCode();
-        if (s4 !== peg$FAILED) {
-          if (input.charCodeAt(peg$currPos) === 125) {
-            s5 = peg$c3;
-            peg$currPos++;
-          } else {
-            s5 = peg$FAILED;
-            if (peg$silentFails === 0) { peg$fail(peg$c4); }
-          }
-          if (s5 !== peg$FAILED) {
-            s3 = [s3, s4, s5];
-            s2 = s3;
-          } else {
-            peg$currPos = s2;
-            s2 = peg$FAILED;
-          }
+        if (input.charCodeAt(peg$currPos) === 125) {
+          s5 = peg$c3;
+          peg$currPos++;
+        } else {
+          s5 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c4); }
+        }
+        if (s5 !== peg$FAILED) {
+          s3 = [s3, s4, s5];
+          s2 = s3;
         } else {
           peg$currPos = s2;
           s2 = peg$FAILED;
@@ -3430,21 +3210,16 @@ function peg$parse(input, options) {
         }
         if (s3 !== peg$FAILED) {
           s4 = peg$parseCode();
-          if (s4 !== peg$FAILED) {
-            if (input.charCodeAt(peg$currPos) === 125) {
-              s5 = peg$c3;
-              peg$currPos++;
-            } else {
-              s5 = peg$FAILED;
-              if (peg$silentFails === 0) { peg$fail(peg$c4); }
-            }
-            if (s5 !== peg$FAILED) {
-              s3 = [s3, s4, s5];
-              s2 = s3;
-            } else {
-              peg$currPos = s2;
-              s2 = peg$FAILED;
-            }
+          if (input.charCodeAt(peg$currPos) === 125) {
+            s5 = peg$c3;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c4); }
+          }
+          if (s5 !== peg$FAILED) {
+            s3 = [s3, s4, s5];
+            s2 = s3;
           } else {
             peg$currPos = s2;
             s2 = peg$FAILED;
@@ -3455,11 +3230,7 @@ function peg$parse(input, options) {
         }
       }
     }
-    if (s1 !== peg$FAILED) {
-      s0 = input.substring(s0, peg$currPos);
-    } else {
-      s0 = s1;
-    }
+    s0 = input.substring(s0, peg$currPos);
 
     return s0;
   }
@@ -4999,21 +4770,16 @@ function peg$parse(input, options) {
 
     s0 = peg$currPos;
     s1 = peg$parse__();
-    if (s1 !== peg$FAILED) {
-      if (input.charCodeAt(peg$currPos) === 59) {
-        s2 = peg$c240;
-        peg$currPos++;
-      } else {
-        s2 = peg$FAILED;
-        if (peg$silentFails === 0) { peg$fail(peg$c241); }
-      }
-      if (s2 !== peg$FAILED) {
-        s1 = [s1, s2];
-        s0 = s1;
-      } else {
-        peg$currPos = s0;
-        s0 = peg$FAILED;
-      }
+    if (input.charCodeAt(peg$currPos) === 59) {
+      s2 = peg$c240;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$c241); }
+    }
+    if (s2 !== peg$FAILED) {
+      s1 = [s1, s2];
+      s0 = s1;
     } else {
       peg$currPos = s0;
       s0 = peg$FAILED;
@@ -5021,24 +4787,14 @@ function peg$parse(input, options) {
     if (s0 === peg$FAILED) {
       s0 = peg$currPos;
       s1 = peg$parse_();
-      if (s1 !== peg$FAILED) {
-        s2 = peg$parseSingleLineComment();
-        if (s2 === peg$FAILED) {
-          s2 = null;
-        }
-        if (s2 !== peg$FAILED) {
-          s3 = peg$parseLineTerminatorSequence();
-          if (s3 !== peg$FAILED) {
-            s1 = [s1, s2, s3];
-            s0 = s1;
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
-        } else {
-          peg$currPos = s0;
-          s0 = peg$FAILED;
-        }
+      s2 = peg$parseSingleLineComment();
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      s3 = peg$parseLineTerminatorSequence();
+      if (s3 !== peg$FAILED) {
+        s1 = [s1, s2, s3];
+        s0 = s1;
       } else {
         peg$currPos = s0;
         s0 = peg$FAILED;
@@ -5046,15 +4802,10 @@ function peg$parse(input, options) {
       if (s0 === peg$FAILED) {
         s0 = peg$currPos;
         s1 = peg$parse__();
-        if (s1 !== peg$FAILED) {
-          s2 = peg$parseEOF();
-          if (s2 !== peg$FAILED) {
-            s1 = [s1, s2];
-            s0 = s1;
-          } else {
-            peg$currPos = s0;
-            s0 = peg$FAILED;
-          }
+        s2 = peg$parseEOF();
+        if (s2 !== peg$FAILED) {
+          s1 = [s1, s2];
+          s0 = s1;
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;