replace jest with ava

node_modules/concordance/lib/recursorUtils.js

@@ -0,0 +1,110 @@
+'use strict'
+
+const NOOP_RECURSOR = {
+  size: 0,
+  next () { return null }
+}
+exports.NOOP_RECURSOR = NOOP_RECURSOR
+
+function fork (recursor) {
+  const buffer = []
+
+  return {
+    shared () {
+      const next = recursor()
+      if (next !== null) buffer.push(next)
+      return next
+    },
+
+    recursor () {
+      if (buffer.length > 0) return buffer.shift()
+      return recursor()
+    }
+  }
+}
+exports.fork = fork
+
+function map (recursor, mapFn) {
+  return () => {
+    const next = recursor()
+    if (next === null) return null
+
+    return mapFn(next)
+  }
+}
+exports.map = map
+
+function replay (state, create) {
+  if (!state) {
+    const recursor = create()
+    if (recursor === NOOP_RECURSOR) {
+      state = recursor
+    } else {
+      state = Object.assign({
+        buffer: [],
+        done: false
+      }, recursor)
+    }
+  }
+
+  if (state === NOOP_RECURSOR) return {state, recursor: state}
+
+  let done = false
+  let index = 0
+  const next = () => {
+    if (done) return null
+
+    let retval = state.buffer[index]
+    if (retval === undefined) {
+      retval = state.buffer[index] = state.next()
+    }
+
+    index++
+    if (retval === null) {
+      done = true
+    }
+    return retval
+  }
+
+  return {state, recursor: {next, size: state.size}}
+}
+exports.replay = replay
+
+function sequence (first, second) {
+  let fromFirst = true
+  return () => {
+    if (fromFirst) {
+      const next = first()
+      if (next !== null) return next
+
+      fromFirst = false
+    }
+
+    return second()
+  }
+}
+exports.sequence = sequence
+
+function singleValue (value) {
+  let done = false
+  return () => {
+    if (done) return null
+
+    done = true
+    return value
+  }
+}
+exports.singleValue = singleValue
+
+function unshift (recursor, value) {
+  return () => {
+    if (value !== null) {
+      const next = value
+      value = null
+      return next
+    }
+
+    return recursor()
+  }
+}
+exports.unshift = unshift