Remove inessential functions from the JS Script class

src/js/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // -------------------------------------------------------------------
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
@@ skipping 23 matching lines @@
 var Int16x8ToString;
 var Int32x4ToString;
 var Int8x16ToString;
 var InternalArray = utils.InternalArray;
 var internalErrorSymbol = utils.ImportNow("internal_error_symbol");
 var ObjectHasOwnProperty;
 var ObjectToString = utils.ImportNow("object_to_string");
 var Script = utils.ImportNow("Script");
 var stackTraceSymbol = utils.ImportNow("stack_trace_symbol");
 var StringIndexOf;
-var StringSubstring;
 var SymbolToString;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 var Uint16x8ToString;
 var Uint32x4ToString;
 var Uint8x16ToString;
 
 utils.Import(function(from) {
   ArrayJoin = from.ArrayJoin;
   Bool16x8ToString = from.Bool16x8ToString;
   Bool32x4ToString = from.Bool32x4ToString;
   Bool8x16ToString = from.Bool8x16ToString;
   Float32x4ToString = from.Float32x4ToString;
   Int16x8ToString = from.Int16x8ToString;
   Int32x4ToString = from.Int32x4ToString;
   Int8x16ToString = from.Int8x16ToString;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
   StringIndexOf = from.StringIndexOf;
-  StringSubstring = from.StringSubstring;
   SymbolToString = from.SymbolToString;
   Uint16x8ToString = from.Uint16x8ToString;
   Uint32x4ToString = from.Uint32x4ToString;
   Uint8x16ToString = from.Uint8x16ToString;
 });
 
 // -------------------------------------------------------------------
 
 var GlobalError;
 var GlobalTypeError;
@@ skipping 139 matching lines @@
 function GetSourceLine(message) {
   var script = %MessageGetScript(message);
   var start_position = %MessageGetStartPosition(message);
   var location = script.locationFromPosition(start_position, true);
   if (location == null) return "";
   return location.sourceText;
 }
 
 
 /**
- * Find a line number given a specific source position.
- * @param {number} position The source position.
- * @return {number} 0 if input too small, -1 if input too large,
-       else the line number.
- */
-function ScriptLineFromPosition(position) {
-  var info = %ScriptPositionInfo(this, position, false);
-  return (info == null) ? -1 : info.line;
-}
-
-
-/**
  * Get information on a specific source position.
  * Returns an object with the following following properties:
  *   script     : script object for the source
  *   line       : source line number
  *   column     : source column within the line
  *   position   : position within the source
  *   sourceText : a string containing the current line
  * @param {number} position The source position
  * @param {boolean} include_resource_offset Set to true to have the resource
  *     offset added to the location
  * @return If line is negative or not in the source null is returned.
  */
 function ScriptLocationFromPosition(position,
                                     include_resource_offset) {
   return %ScriptPositionInfo(this, position, !!include_resource_offset);
 }
 
 
 /**
- * Get information on a specific source line and column possibly offset by a
- * fixed source position. This function is used to find a source position from
- * a line and column position. The fixed source position offset is typically
- * used to find a source position in a function based on a line and column in
- * the source for the function alone. The offset passed will then be the
- * start position of the source for the function within the full script source.
- * @param {number} opt_line The line within the source. Default value is 0
- * @param {number} opt_column The column in within the line. Default value is 0
- * @param {number} opt_offset_position The offset from the begining of the
- *     source from where the line and column calculation starts.
- *     Default value is 0
- * @return If line is negative or not in the source null is returned.
- */
-function ScriptLocationFromLine(opt_line, opt_column, opt_offset_position) {
-  // Default is the first line in the script. Lines in the script is relative
-  // to the offset within the resource.
-  var line = 0;
-  if (!IS_UNDEFINED(opt_line)) {
-    line = opt_line - this.line_offset;
-  }
-
-  // Default is first column. If on the first line add the offset within the
-  // resource.
-  var column = opt_column || 0;
-  if (line == 0) {
-    column -= this.column_offset;
-  }
-
-  var offset_position = opt_offset_position || 0;
-  if (line < 0 || column < 0 || offset_position < 0) return null;
-  if (line == 0) {
-    return this.locationFromPosition(offset_position + column, false);
-  } else {
-    // Find the line where the offset position is located.
-    var offset_line = this.lineFromPosition(offset_position);
-
-    if (offset_line == -1 || offset_line + line >= this.lineCount()) {
-      return null;
-    }
-
-    return this.locationFromPosition(
-        %ScriptLineStartPosition(this, offset_line + line) + column);
-  }
-}
-
-
-/**
- * Get a slice of source code from the script. The boundaries for the slice is
- * specified in lines.
- * @param {number} opt_from_line The first line (zero bound) in the slice.
- *     Default is 0
- * @param {number} opt_to_column The last line (zero bound) in the slice (non
- *     inclusive). Default is the number of lines in the script
- * @return {SourceSlice} The source slice or null of the parameters where
- *     invalid
- */
-function ScriptSourceSlice(opt_from_line, opt_to_line) {
-  var from_line = IS_UNDEFINED(opt_from_line) ? this.line_offset
-                                              : opt_from_line;
-  var to_line = IS_UNDEFINED(opt_to_line) ? this.line_offset + this.lineCount()
-                                          : opt_to_line;
-
-  // Adjust according to the offset within the resource.
-  from_line -= this.line_offset;
-  to_line -= this.line_offset;
-  if (from_line < 0) from_line = 0;
-  if (to_line > this.lineCount()) to_line = this.lineCount();
-
-  // Check parameters.
-  if (from_line >= this.lineCount() ||
-      to_line < 0 ||
-      from_line > to_line) {
-    return null;
-  }
-
-  var from_position = %ScriptLineStartPosition(this, from_line);
-  var to_position = %ScriptLineStartPosition(this, to_line);
-
-  // Return a source slice with line numbers re-adjusted to the resource.
-  return new SourceSlice(this,
-                         from_line + this.line_offset,
-                         to_line + this.line_offset,
-                         from_position, to_position);
-}
-
-
-function ScriptSourceLine(opt_line) {
-  // Default is the first line in the script. Lines in the script are relative
-  // to the offset within the resource.
-  var line = 0;
-  if (!IS_UNDEFINED(opt_line)) {
-    line = opt_line - this.line_offset;
-  }
-
-  // Check parameter.
-  if (line < 0 || this.lineCount() <= line) {
-    return null;
-  }
-
-  // Return the source line.
-  var start = %ScriptLineStartPosition(this, line);
-  var end = %ScriptLineEndPosition(this, line);
-  return %_Call(StringSubstring, this.source, start, end);
-}
-
-
-/**
- * Returns the number of source lines.
- * @return {number}
- *     Number of source lines.
- */
-function ScriptLineCount() {
-  // Return number of source lines.
-  return %ScriptLineCount(this);
-}
-
-
-/**
  * If sourceURL comment is available returns sourceURL comment contents.
  * Otherwise, script name is returned. See
  * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt
  * and Source Map Revision 3 proposal for details on using //# sourceURL and
  * deprecated //@ sourceURL comment to identify scripts that don't have name.
  *
  * @return {?string} script name if present, value for //# sourceURL comment or
  * deprecated //@ sourceURL comment otherwise.
  */
 function ScriptNameOrSourceURL() {
   if (this.source_url) return this.source_url;
   return this.name;
 }
 
 
 utils.SetUpLockedPrototype(Script, [
     "source",
     "name",
     "source_url",
     "source_mapping_url",
     "line_offset",
     "column_offset"
   ], [
-    "lineFromPosition", ScriptLineFromPosition,
     "locationFromPosition", ScriptLocationFromPosition,
-    "locationFromLine", ScriptLocationFromLine,
-    "sourceSlice", ScriptSourceSlice,
-    "sourceLine", ScriptSourceLine,
-    "lineCount", ScriptLineCount,
     "nameOrSourceURL", ScriptNameOrSourceURL,
   ]
 );
 
 
-/**
- * Class for a source slice. A source slice is a part of a script source with
- * the following properties:
- *   script        : script object for the source
- *   from_line     : line number for the first line in the slice
- *   to_line       : source line number for the last line in the slice
- *   from_position : position of the first character in the slice
- *   to_position   : position of the last character in the slice
- * The to_line and to_position are not included in the slice, that is the lines
- * in the slice are [from_line, to_line[. Likewise the characters in the slice
- * are [from_position, to_position[.
- * @param {Script} script The Script object for the source slice
- * @param {number} from_line
- * @param {number} to_line
- * @param {number} from_position
- * @param {number} to_position
- * @constructor
- */
-function SourceSlice(script, from_line, to_line, from_position, to_position) {
-  this.script = script;
-  this.from_line = from_line;
-  this.to_line = to_line;
-  this.from_position = from_position;
-  this.to_position = to_position;
-}
-
-/**
- * Get the source text for a SourceSlice
- * @return {String} Source text for this slice. The last line will include
- *     the line terminating characters (if any)
- */
-function SourceSliceSourceText() {
-  return %_Call(StringSubstring,
-                this.script.source,
-                this.from_position,
-                this.to_position);
-}
-
-utils.SetUpLockedPrototype(SourceSlice,
-  ["script", "from_line", "to_line", "from_position", "to_position"],
-  ["sourceText", SourceSliceSourceText]
-);
-
-
 function GetStackTraceLine(recv, fun, pos, isGlobal) {
   return new CallSite(recv, fun, pos, false).toString();
 }
 
 // ----------------------------------------------------------------------------
 // Error implementation
 
 function CallSite(receiver, fun, pos, strict_mode) {
   // For wasm frames, receiver is the wasm object and fun is the function index
   // instead of an actual function.
@@ skipping 478 matching lines @@
 utils.Export(function(to) {
   to.ErrorToString = ErrorToString;
   to.MakeError = MakeError;
   to.MakeRangeError = MakeRangeError;
   to.MakeSyntaxError = MakeSyntaxError;
   to.MakeTypeError = MakeTypeError;
   to.MakeURIError = MakeURIError;
 });
 
 });