replace jest with ava

node_modules/concordance/lib/lineBuilder.js

@@ -0,0 +1,309 @@
+'use strict'
+
+const ACTUAL = Symbol('lineBuilder.gutters.ACTUAL')
+const EXPECTED = Symbol('lineBuilder.gutters.EXPECTED')
+
+function translateGutter (theme, invert, gutter) {
+  if (invert) {
+    if (gutter === ACTUAL) return theme.diffGutters.expected
+    if (gutter === EXPECTED) return theme.diffGutters.actual
+  } else {
+    if (gutter === ACTUAL) return theme.diffGutters.actual
+    if (gutter === EXPECTED) return theme.diffGutters.expected
+  }
+  return theme.diffGutters.padding
+}
+
+class Line {
+  constructor (isFirst, isLast, gutter, stringValue) {
+    this.isFirst = isFirst
+    this.isLast = isLast
+    this.gutter = gutter
+    this.stringValue = stringValue
+  }
+
+  * [Symbol.iterator] () {
+    yield this
+  }
+
+  get isEmpty () {
+    return false
+  }
+
+  get hasGutter () {
+    return this.gutter !== null
+  }
+
+  get isSingle () {
+    return this.isFirst && this.isLast
+  }
+
+  append (other) {
+    return this.concat(other)
+  }
+
+  concat (other) {
+    return new Collection()
+      .append(this)
+      .append(other)
+  }
+
+  toString (options) {
+    if (options.diff === false) return this.stringValue
+
+    return translateGutter(options.theme, options.invert, this.gutter) + this.stringValue
+  }
+
+  mergeWithInfix (infix, other) {
+    if (other.isLine !== true) {
+      return new Collection()
+        .append(this)
+        .mergeWithInfix(infix, other)
+    }
+
+    return new Line(this.isFirst, other.isLast, other.gutter, this.stringValue + infix + other.stringValue)
+  }
+
+  withFirstPrefixed (prefix) {
+    if (!this.isFirst) return this
+
+    return new Line(true, this.isLast, this.gutter, prefix + this.stringValue)
+  }
+
+  withLastPostfixed (postfix) {
+    if (!this.isLast) return this
+
+    return new Line(this.isFirst, true, this.gutter, this.stringValue + postfix)
+  }
+
+  stripFlags () {
+    return new Line(false, false, this.gutter, this.stringValue)
+  }
+
+  decompose () {
+    return new Collection()
+      .append(this)
+      .decompose()
+  }
+}
+Object.defineProperty(Line.prototype, 'isLine', {value: true})
+
+class Collection {
+  constructor () {
+    this.buffer = []
+  }
+
+  * [Symbol.iterator] () {
+    for (const appended of this.buffer) {
+      for (const line of appended) yield line
+    }
+  }
+
+  get isEmpty () {
+    return this.buffer.length === 0
+  }
+
+  get hasGutter () {
+    for (const line of this) {
+      if (line.hasGutter) return true
+    }
+    return false
+  }
+
+  get isSingle () {
+    const iterator = this[Symbol.iterator]()
+    iterator.next()
+    return iterator.next().done === true
+  }
+
+  append (lineOrLines) {
+    if (!lineOrLines.isEmpty) this.buffer.push(lineOrLines)
+    return this
+  }
+
+  concat (other) {
+    return new Collection()
+      .append(this)
+      .append(other)
+  }
+
+  toString (options) {
+    let lines = this
+
+    if (options.invert) {
+      lines = new Collection()
+      let buffer = new Collection()
+
+      let prev = null
+      for (const line of this) {
+        if (line.gutter === ACTUAL) {
+          if (prev !== null && prev.gutter !== ACTUAL && !buffer.isEmpty) {
+            lines.append(buffer)
+            buffer = new Collection()
+          }
+
+          buffer.append(line)
+        } else if (line.gutter === EXPECTED) {
+          lines.append(line)
+        } else {
+          if (!buffer.isEmpty) {
+            lines.append(buffer)
+            buffer = new Collection()
+          }
+
+          lines.append(line)
+        }
+
+        prev = line
+      }
+      lines.append(buffer)
+    }
+
+    return Array.from(lines, line => line.toString(options)).join('\n')
+  }
+
+  mergeWithInfix (infix, from) {
+    if (from.isEmpty) throw new Error('Cannot merge, `from` is empty.')
+
+    const otherLines = Array.from(from)
+    if (!otherLines[0].isFirst) throw new Error('Cannot merge, `from` has no first line.')
+
+    const merged = new Collection()
+    let seenLast = false
+    for (const line of this) {
+      if (seenLast) throw new Error('Cannot merge line, the last line has already been seen.')
+
+      if (!line.isLast) {
+        merged.append(line)
+        continue
+      }
+
+      seenLast = true
+      for (const other of otherLines) {
+        if (other.isFirst) {
+          merged.append(line.mergeWithInfix(infix, other))
+        } else {
+          merged.append(other)
+        }
+      }
+    }
+    return merged
+  }
+
+  withFirstPrefixed (prefix) {
+    return new Collection()
+      .append(Array.from(this, line => line.withFirstPrefixed(prefix)))
+  }
+
+  withLastPostfixed (postfix) {
+    return new Collection()
+      .append(Array.from(this, line => line.withLastPostfixed(postfix)))
+  }
+
+  stripFlags () {
+    return new Collection()
+      .append(Array.from(this, line => line.stripFlags()))
+  }
+
+  decompose () {
+    const first = {actual: new Collection(), expected: new Collection()}
+    const last = {actual: new Collection(), expected: new Collection()}
+    const remaining = new Collection()
+
+    for (const line of this) {
+      if (line.isFirst && line.gutter === ACTUAL) {
+        first.actual.append(line)
+      } else if (line.isFirst && line.gutter === EXPECTED) {
+        first.expected.append(line)
+      } else if (line.isLast && line.gutter === ACTUAL) {
+        last.actual.append(line)
+      } else if (line.isLast && line.gutter === EXPECTED) {
+        last.expected.append(line)
+      } else {
+        remaining.append(line)
+      }
+    }
+
+    return {first, last, remaining}
+  }
+}
+Object.defineProperty(Collection.prototype, 'isCollection', {value: true})
+
+function setDefaultGutter (iterable, gutter) {
+  return new Collection()
+    .append(Array.from(iterable, line => {
+      return line.gutter === null
+        ? new Line(line.isFirst, line.isLast, gutter, line.stringValue)
+        : line
+    }))
+}
+
+module.exports = {
+  buffer () {
+    return new Collection()
+  },
+
+  first (stringValue) {
+    return new Line(true, false, null, stringValue)
+  },
+
+  last (stringValue) {
+    return new Line(false, true, null, stringValue)
+  },
+
+  line (stringValue) {
+    return new Line(false, false, null, stringValue)
+  },
+
+  single (stringValue) {
+    return new Line(true, true, null, stringValue)
+  },
+
+  setDefaultGutter (lineOrCollection) {
+    return lineOrCollection
+  },
+
+  actual: {
+    first (stringValue) {
+      return new Line(true, false, ACTUAL, stringValue)
+    },
+
+    last (stringValue) {
+      return new Line(false, true, ACTUAL, stringValue)
+    },
+
+    line (stringValue) {
+      return new Line(false, false, ACTUAL, stringValue)
+    },
+
+    single (stringValue) {
+      return new Line(true, true, ACTUAL, stringValue)
+    },
+
+    setDefaultGutter (lineOrCollection) {
+      return setDefaultGutter(lineOrCollection, ACTUAL)
+    }
+  },
+
+  expected: {
+    first (stringValue) {
+      return new Line(true, false, EXPECTED, stringValue)
+    },
+
+    last (stringValue) {
+      return new Line(false, true, EXPECTED, stringValue)
+    },
+
+    line (stringValue) {
+      return new Line(false, false, EXPECTED, stringValue)
+    },
+
+    single (stringValue) {
+      return new Line(true, true, EXPECTED, stringValue)
+    },
+
+    setDefaultGutter (lineOrCollection) {
+      return setDefaultGutter(lineOrCollection, EXPECTED)
+    }
+  }
+}