WIP - add extractor, generate snippet_data

node_modules/vfile-location/index.js

@@ -0,0 +1,74 @@
+'use strict'
+
+module.exports = factory
+
+function factory(file) {
+  var contents = indices(String(file))
+
+  return {
+    toPosition: offsetToPositionFactory(contents),
+    toOffset: positionToOffsetFactory(contents)
+  }
+}
+
+// Factory to get the line and column-based `position` for `offset` in the bound
+// indices.
+function offsetToPositionFactory(indices) {
+  return offsetToPosition
+
+  // Get the line and column-based `position` for `offset` in the bound indices.
+  function offsetToPosition(offset) {
+    var index = -1
+    var length = indices.length
+
+    if (offset < 0) {
+      return {}
+    }
+
+    while (++index < length) {
+      if (indices[index] > offset) {
+        return {
+          line: index + 1,
+          column: offset - (indices[index - 1] || 0) + 1,
+          offset: offset
+        }
+      }
+    }
+
+    return {}
+  }
+}
+
+// Factory to get the `offset` for a line and column-based `position` in the
+// bound indices.
+function positionToOffsetFactory(indices) {
+  return positionToOffset
+
+  // Get the `offset` for a line and column-based `position` in the bound
+  // indices.
+  function positionToOffset(position) {
+    var line = position && position.line
+    var column = position && position.column
+
+    if (!isNaN(line) && !isNaN(column) && line - 1 in indices) {
+      return (indices[line - 2] || 0) + column - 1 || 0
+    }
+
+    return -1
+  }
+}
+
+// Get indices of line-breaks in `value`.
+function indices(value) {
+  var result = []
+  var index = value.indexOf('\n')
+
+  while (index !== -1) {
+    result.push(index + 1)
+    index = value.indexOf('\n', index + 1)
+  }
+
+  result.push(value.length + 1)
+
+  return result
+}