Try parsing signatures only if node is callable, see #149; Minor refactoring

src/common.ts

@@ -0,0 +1,94 @@
+/**
+ * Common constants.
+ * @module common
+ *//***/
+
+/** Indicates traits of a {@link Node} or {@link Element}. */
+export enum CommonFlags {
+  /** No flags set. */
+  NONE = 0,
+
+  // Basic modifiers
+
+  /** Has an `import` modifier. */
+  IMPORT = 1 << 0,
+  /** Has an `export` modifier. */
+  EXPORT = 1 << 1,
+  /** Has a `declare` modifier. */
+  DECLARE = 1 << 2,
+  /** Has a `const` modifier. */
+  CONST = 1 << 3,
+  /** Has a `let` modifier. */
+  LET = 1 << 4,
+  /** Has a `static` modifier. */
+  STATIC = 1 << 5,
+  /** Has a `readonly` modifier. */
+  READONLY = 1 << 6,
+  /** Has an `abstract` modifier. */
+  ABSTRACT = 1 << 7,
+  /** Has a `public` modifier. */
+  PUBLIC = 1 << 8,
+  /** Has a `private` modifier. */
+  PRIVATE = 1 << 9,
+  /** Has a `protected` modifier. */
+  PROTECTED = 1 << 10,
+  /** Has a `get` modifier. */
+  GET = 1 << 11,
+  /** Has a `set` modifier. */
+  SET = 1 << 12,
+
+  // Extended modifiers usually derived from basic modifiers
+
+  /** Is ambient, that is either declared or nested in a declared element. */
+  AMBIENT = 1 << 13,
+  /** Is generic. */
+  GENERIC = 1 << 14,
+  /** Is part of a generic context. */
+  GENERIC_CONTEXT = 1 << 15,
+  /** Is an instance member. */
+  INSTANCE = 1 << 16,
+  /** Is a constructor. */
+  CONSTRUCTOR = 1 << 17,
+  /** Is an arrow function. */
+  ARROW = 1 << 18,
+  /** Is a module export. */
+  MODULE_EXPORT = 1 << 19,
+  /** Is a module import. */
+  MODULE_IMPORT = 1 << 20,
+
+  // Compilation states
+
+  /** Is a builtin. */
+  BUILTIN = 1 << 21,
+  /** Is compiled. */
+  COMPILED = 1 << 22,
+  /** Has a constant value and is therefore inlined. */
+  INLINED = 1 << 23,
+  /** Is scoped. */
+  SCOPED = 1 << 24,
+  /** Is a trampoline. */
+  TRAMPOLINE = 1 << 25,
+  /** Is a virtual method. */
+  VIRTUAL = 1 << 26
+}
+
+/** Path delimiter inserted between file system levels. */
+export const PATH_DELIMITER = "/";
+/** Substitution used to indicate the parent directory. */
+export const PARENT_SUBST = "..";
+/** Function name prefix used for getters. */
+export const GETTER_PREFIX = "get:";
+/** Function name prefix used for setters. */
+export const SETTER_PREFIX = "set:";
+/** Delimiter used between class names and instance members. */
+export const INSTANCE_DELIMITER = "#";
+/** Delimiter used between class and namespace names and static members. */
+export const STATIC_DELIMITER = ".";
+/** Delimiter used between a function and its inner elements. */
+export const INNER_DELIMITER = "~";
+/** Substitution used to indicate a library directory. */
+export const LIBRARY_SUBST = "~lib";
+/** Library directory prefix. */
+export const LIBRARY_PREFIX = LIBRARY_SUBST + PATH_DELIMITER;
+/** Prefix used to indicate a filespace element. */
+export const FILESPACE_PREFIX = "file:";