finish reorganisation of babylon

packages/babylon/src/util/location.js

@@ -0,0 +1,41 @@
+import { lineBreakG } from "./whitespace";
+
+// These are used when `options.locations` is on, for the
+// `startLoc` and `endLoc` properties.
+
+export class Position {
+  constructor(line, col) {
+    this.line = line;
+    this.column = col;
+  }
+
+  offset(n) {
+    return new Position(this.line, this.column + n);
+  }
+}
+
+export class SourceLocation {
+  constructor(start, end) {
+    this.start = start;
+    this.end = end;
+  }
+}
+
+// The `getLineInfo` function is mostly useful when the
+// `locations` option is off (for performance reasons) and you
+// want to find the line/column position for a given character
+// offset. `input` should be the code string that the offset refers
+// into.
+
+export function getLineInfo(input, offset) {
+  for (let line = 1, cur = 0; ;) {
+    lineBreakG.lastIndex = cur;
+    let match = lineBreakG.exec(input);
+    if (match && match.index < offset) {
+      ++line;
+      cur = match.index + match[0].length;
+    } else {
+      return new Position(line, offset - cur);
+    }
+  }
+}