Code style: Fix some ESLint errors in generated code

Running ESLint on generated code with the configuration used on PEG.js
itself produces a lot of errors. This commit fixes some unnecessary ones
caught by these rules:

  - max-len
  - new-cap
  - newline-before-return
  - no-unused-vars

See also 5dd8e797f7.

Follow-up to #407.

lib/compiler/passes/generate-js.js

@@ -746,9 +746,9 @@ function generateJS(ast, options) {
 
     parts.push([
       "function peg$subclass(child, parent) {",
-      "  function ctor() { this.constructor = child; }",
+      "  function C() { this.constructor = child; }",
-      "  ctor.prototype = parent.prototype;",
+      "  C.prototype = parent.prototype;",
-      "  child.prototype = new ctor();",
+      "  child.prototype = new C();",
       "}",
       "",
       "function peg$SyntaxError(message, expected, found, location) {",
@@ -781,11 +781,11 @@ function generateJS(ast, options) {
       "      return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";",
       "    },",
       "",
-      "    any: function(expectation) {",
+      "    any: function() {",
       "      return \"any character\";",
       "    },",
       "",
-      "    end: function(expectation) {",
+      "    end: function() {",
       "      return \"end of input\";",
       "    },",
       "",
@@ -1039,7 +1039,9 @@ function generateJS(ast, options) {
       "  }",
       "",
       "  function expected(description, location) {",
-      "    location = location !== undefined ? location : peg$computeLocation(peg$savedPos, peg$currPos);",
+      "    location = location !== undefined",
+      "      ? location",
+      "      : peg$computeLocation(peg$savedPos, peg$currPos);",
       "",
       "    throw peg$buildStructuredError(",
       "      [peg$otherExpectation(description)],",
@@ -1049,7 +1051,9 @@ function generateJS(ast, options) {
       "  }",
       "",
       "  function error(message, location) {",
-      "    location = location !== undefined ? location : peg$computeLocation(peg$savedPos, peg$currPos);",
+      "    location = location !== undefined",
+      "      ? location",
+      "      : peg$computeLocation(peg$savedPos, peg$currPos);",
       "",
       "    throw peg$buildSimpleError(message, location);",
       "  }",
@@ -1104,6 +1108,7 @@ function generateJS(ast, options) {
       "      }",
       "",
       "      peg$posDetailsCache[pos] = details;",
+      "",
       "      return details;",
       "    }",
       "  }",

lib/parser.js

@@ -5,9 +5,9 @@
 "use strict";
 
 function peg$subclass(child, parent) {
-  function ctor() { this.constructor = child; }
+  function C() { this.constructor = child; }
-  ctor.prototype = parent.prototype;
+  C.prototype = parent.prototype;
-  child.prototype = new ctor();
+  child.prototype = new C();
 }
 
 function peg$SyntaxError(message, expected, found, location) {
@@ -40,11 +40,11 @@ peg$SyntaxError.buildMessage = function(expected, found) {
       return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
     },
 
-    any: function(expectation) {
+    any: function() {
       return "any character";
     },
 
-    end: function(expectation) {
+    end: function() {
       return "end of input";
     },
 
@@ -507,7 +507,9 @@ function peg$parse(input, options) {
   }
 
   function expected(description, location) {
-    location = location !== undefined ? location : peg$computeLocation(peg$savedPos, peg$currPos);
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
 
     throw peg$buildStructuredError(
       [peg$otherExpectation(description)],
@@ -517,7 +519,9 @@ function peg$parse(input, options) {
   }
 
   function error(message, location) {
-    location = location !== undefined ? location : peg$computeLocation(peg$savedPos, peg$currPos);
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
 
     throw peg$buildSimpleError(message, location);
   }
@@ -572,6 +576,7 @@ function peg$parse(input, options) {
       }
 
       peg$posDetailsCache[pos] = details;
+
       return details;
     }
   }