Subsecciones

Algoritmo de Búsqueda Ejecutado por require

require(X) from module at path Y

  1. If X is a core module,
    1. return the core module
    2. STOP
  2. If X begins with './' or '/' or '../'
    1. LOAD_AS_FILE(Y + X)
    2. LOAD_AS_DIRECTORY(Y + X)
  3. LOAD_NODE_MODULES(X, dirname(Y))
  4. THROW "not found"

LOAD_AS_FILE(X)

  1. If X is a file, load X as JavaScript text. STOP
  2. If X.js is a file, load X.js as JavaScript text. STOP
  3. If X.node is a file, load X.node as binary addon. STOP

LOAD_AS_DIRECTORY(X)

  1. If X/package.json is a file, a. Parse X/package.json, and look for "main" field. b. let M = X + (json main field) c. LOAD_AS_FILE(M)
  2. If X/index.js is a file, load X/index.js as JavaScript text. STOP
  3. If X/index.node is a file, load X/index.node as binary addon. STOP

LOAD_NODE_MODULES(X, START)

  1. let DIRS=NODE_MODULES_PATHS(START)
  2. for each DIR in DIRS: a. LOAD_AS_FILE(DIR/X) b. LOAD_AS_DIRECTORY(DIR/X)

NODE_MODULES_PATHS(START)

  1. let PARTS = path split(START)
  2. let ROOT = index of first instance of "node_modules" in PARTS, or 0
  3. let I = count of PARTS - 1
  4. let DIRS = []
  5. while I > ROOT, a. if PARTS[I] = "node_modules" CONTINUE c. DIR = path join(PARTS[0 .. I] + "node_modules") b. DIRS = DIRS + DIR c. let I = I - 1
  6. return DIRS

Casiano Rodriguez León 2015-06-18