add offsetToLineColumnConverter to remix-lib

remix-lib/index.js

@@ -5,6 +5,7 @@ var uiHelper = require('./src/helpers/uiHelper')
 var compilerHelper = require('./src/helpers/compilerHelper')
 var SourceMappingDecoder = require('./src/sourceMappingDecoder')
 var SourceLocationTracker = require('./src/sourceLocationTracker')
+var OffsetToColumnConverter = require('./src/offsetToLineColumnConverter')
 var init = require('./src/init')
 var util = require('./src/util')
 var Web3Providers = require('./src/web3Provider/web3Providers')
@@ -56,6 +57,7 @@ function modules () {
     },
     SourceMappingDecoder: SourceMappingDecoder,
     SourceLocationTracker: SourceLocationTracker,
+    OffsetToColumnConverter: OffsetToColumnConverter,
     Storage: Storage,
     init: init,
     util: util,

remix-lib/src/offsetToLineColumnConverter.js

+'use strict'
+var SourceMappingDecoder = require('./sourceMappingDecoder')
+
+function offsetToColumnConverter (compilerEvent) {
+  this.lineBreakPositionsByContent = {}
+  this.sourceMappingDecoder = new SourceMappingDecoder()
+  var self = this
+  if (compilerEvent) {
+    compilerEvent.register('compilationFinished', function (success, data, source) {
+      self.clear()
+    })
+  }
+}
+
+offsetToColumnConverter.prototype.offsetToLineColumn = function (rawLocation, file, sources, asts) {
+  if (!this.lineBreakPositionsByContent[file]) {
+    for (var filename in asts) {
+      var source = asts[filename]
+      if (source.id === file) {
+        this.lineBreakPositionsByContent[file] = this.sourceMappingDecoder.getLinebreakPositions(sources[filename].content)
+        break
+      }
+    }
+  }
+  return this.sourceMappingDecoder.convertOffsetToLineColumn(rawLocation, this.lineBreakPositionsByContent[file])
+}
+
+offsetToColumnConverter.prototype.clear = function () {
+  this.lineBreakPositionsByContent = {}
+}
+
+module.exports = offsetToColumnConverter