messages.js.svn-base

Google浏览器V8内核代码

// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


// -------------------------------------------------------------------

const kVowelSounds = {a: true, e: true, i: true, o: true, u: true, y: true};
const kCapitalVowelSounds = {a: true, e: true, i: true, o: true, u: true,
    h: true, f: true, l: true, m: true, n: true, r: true, s: true, x: true,
    y: true};

function GetInstanceName(cons) {
  if (cons.length == 0) {
    return "";
  }
  var first = cons.charAt(0).toLowerCase();
  var mapping = kVowelSounds;
  if (cons.length > 1 && (cons.charAt(0) != first)) {
    // First char is upper case
    var second = cons.charAt(1).toLowerCase();
    // Second char is upper case
    if (cons.charAt(1) != second)
      mapping = kCapitalVowelSounds;
  }
  var s = mapping[first] ? "an " : "a ";
  return s + cons;
};


const kMessages = {
  // Error
  cyclic_proto:                 "Cyclic __proto__ value",
  // TypeError
  unexpected_token:             "Unexpected token %0",
  unexpected_token_number:      "Unexpected number",
  unexpected_token_string:      "Unexpected string",
  unexpected_token_identifier:  "Unexpected identifier",
  unexpected_eos:               "Unexpected end of input",
  expected_label:               "Expected label",
  malformed_regexp:             "Invalid regular expression: /%0/: %1",
  unterminated_regexp:          "Invalid regular expression: missing /",
  pcre_error:                   "PCRE function %0, error code %1",
  regexp_flags:                 "Cannot supply flags when constructing one RegExp from another",
  invalid_lhs_in_assignment:    "Invalid left-hand side in assignment",
  invalid_lhs_in_for_in:        "Invalid left-hand side in for-in",
  invalid_lhs_in_postfix_op:    "Invalid left-hand side expression in postfix operation",
  invalid_lhs_in_prefix_op:     "Invalid left-hand side expression in prefix operation",
  multiple_defaults_in_switch:  "More than one default clause in switch statement",
  newline_after_throw:          "Illegal newline after throw",
  redeclaration:                "%0 '%1' has already been declared",
  no_catch_or_finally:          "Missing catch or finally after try",
  unknown_label:                "Undefined label '%0'",
  invalid_break:                "Invalid break statement",
  invalid_continue:             "Invalid continue statement",
  uncaught_exception:           "Uncaught %0",
  stack_trace:                  "Stack Trace:\n%0",
  called_non_callable:          "%0 is not a function",
  undefined_method:             "Object %1 has no method '%0'",
  property_not_function:        "Property '%0' of object %1 is not a function",
  null_or_undefined:            "Cannot access property of null or undefined",
  cannot_convert_to_primitive:  "Cannot convert object to primitive value",
  not_constructor:              "%0 is not a constructor",
  not_defined:                  "%0 is not defined",
  non_object_property_load:     "Cannot read property '%0' of %1",
  non_object_property_store:    "Cannot set property '%0' of %1",
  non_object_property_call:     "Cannot call method '%0' of %1",
  illegal_eval:                 "Unsupported indirect eval() call",
  with_expression:              "%0 has no properties",
  illegal_invocation:           "Illegal invocation",
  no_setter_in_callback:        "Cannot set property %0 of %1 which has only a getter",
  apply_non_function:           "Function.prototype.apply was called on %0, which is a %1 and not a function",
  apply_wrong_args:             "Function.prototype.apply: Arguments list has wrong type",
  invalid_in_operator_use:      "Cannot use 'in' operator to search for '%0' in %1",
  instanceof_function_expected: "Expecting a function in instanceof check, but got %0",
  instanceof_nonobject_proto:   "Function has non-object prototype '%0' in instanceof check",
  null_to_object:               "Cannot convert null to object",
  // RangeError
  invalid_array_length:         "Invalid array length",
  invalid_array_apply_length:   "Function.prototype.apply supports only up to 1024 arguments",
  stack_overflow:               "Maximum call stack size exceeded",
  apply_overflow:               "Function.prototype.apply cannot support %0 arguments", 
  // SyntaxError
  unable_to_parse:              "Parse error",
  duplicate_regexp_flag:        "Duplicate RegExp flag %0",
  unrecognized_regexp_flag:     "Unrecognized RegExp flag %0",
  invalid_regexp:               "Invalid RegExp pattern /%0/",
  illegal_break:                "Illegal break statement",
  illegal_continue:             "Illegal continue statement",
  illegal_return:               "Illegal return statement",
  error_loading_debugger:       "Error loading debugger %0",
};


function FormatString(format, args) {
  var result = format;
  for (var i = 0; i < args.length; i++) {
    var str;
    try { str = ToDetailString(args[i]); }
    catch (e) { str = "#<error>"; }
    result = result.split("%" + i).join(str);
  }
  return result;
};


function ToDetailString(obj) {
  if (obj != null && IS_OBJECT(obj) && obj.toString === $Object.prototype.toString) {
    var constructor = obj.constructor;
    if (!constructor) return ToString(obj);
    var constructorName = constructor.name;
    if (!constructorName) return ToString(obj);
    return "#<" + GetInstanceName(constructorName) + ">";
  } else {
    return ToString(obj);
  }
};


function MakeGenericError(constructor, type, args) {
  if (args instanceof $Array) {
    for (var i = 0; i < args.length; i++) {
      var elem = args[i];
      if (elem instanceof $Array && elem.length > 100) { // arbitrary limit, grab a reasonable slice to report
        args[i] = elem.slice(0,20).concat("...");
      }
    }
  } else if (IS_UNDEFINED(args)) {
    args = [];
  }

  var e = new constructor();
  e.type = type;
  e.arguments = args;
  return e;
};


/**
 * Setup the Script function and constructor.
 */
%FunctionSetInstanceClassName(Script, 'Script');
%AddProperty(Script.prototype, 'constructor', Script, DONT_ENUM);
%SetCode(Script, function(x) {
  // Script objects can only be created by the VM.
  throw new $Error("Not supported");
});


// Helper functions; called from the runtime system.
function FormatMessage(message) {
  var format = kMessages[message.type];
  if (!format) return "<unknown message " + message.type + ">";
  return FormatString(format, message.args);
};


function GetLineNumber(message) {
  if (message.startPos == -1) return -1;
  var location = message.script.locationFromPosition(message.startPos);
  if (location == null) return -1;
  return location.line + 1;
};


// Returns the source code line containing the given source
// position, or the empty string if the position is invalid.
function GetSourceLine(message) {
  var location = message.script.locationFromPosition(message.startPos);
  if (location == null) return "";
  location.restrict();
  return location.sourceText();
};


function MakeTypeError(type, args) {
  return MakeGenericError($TypeError, type, args);
};


function MakeRangeError(type, args) {
  return MakeGenericError($RangeError, type, args);
};


function MakeSyntaxError(type, args) {
  return MakeGenericError($SyntaxError, type, args);
};


function MakeReferenceError(type, args) {
  return MakeGenericError($ReferenceError, type, args);
};


function MakeEvalError(type, args) {
  return MakeGenericError($EvalError, type, args);
};


function MakeError(type, args) {
  return MakeGenericError($Error, type, args);
};


/**
 * Initialize the cached source information in a script. Currently all line
 * end positions are cached.
 */
Script.prototype.initSourceInfo_ = function () {
  // Just return if initialized.
  if (this.lineEnds_) return;

  // Collect all line endings.
  this.lineEnds_ = [];
  for (var i = 0; i < this.source.length; i++) {
    var current = this.source.charAt(i);
    if (current == '\n') {
      this.lineEnds_.push(i);
    }
  }

  // If the script does not end with a line ending add the final end position
  // as just past the last line ending.
  if (this.lineEnds_[this.lineEnds_.length - 1] != this.source.length - 1) {
    this.lineEnds_.push(this.source.length);
  }
};


/**
 * Get information on a specific source position.
 * @param {number} position The source position
 * @return {SourceLocation}
 *     If line is negative or not in the source null is returned.
 */
Script.prototype.locationFromPosition = function (position) {
  // Make sure source info has been initialized.
  this.initSourceInfo_();

  var lineCount = this.lineCount();
  var line = -1;
  if (position <= this.lineEnds_[0]) {
    line = 0;
  } else {
    for (var i = 1; i < lineCount; i++) {
      if (this.lineEnds_[i - 1] < position && position <= this.lineEnds_[i]) {
        line = i;
        break;
      }
    }
  }

  if (line == -1) return null;

  // Determine start, end and column.
  var start = line == 0 ? 0 : this.lineEnds_[line - 1] + 1;
  var end = this.lineEnds_[line];
  if (end > 0 && this.source.charAt(end - 1) == '\r') end--;
  var column = position - start;

  // Adjust according to the offset within the resource.
  line += this.line_offset;
  if (line == this.line_offset) {
    column += this.column_offset;
  }

  return new SourceLocation(this, position, line, column, start, end);
};


/**
 * 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 {SourceLocation}
 *     If line is negative or not in the source null is returned.
 */
Script.prototype.locationFromLine = function (opt_line, opt_column, opt_offset_position) {
  // Make soure source info has been initialized.
  this.initSourceInfo_();

  // 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);
  } else {
    // Find the line where the offset position is located
    var lineCount = this.lineCount();
    var offset_line;
    for (var i = 0; i < lineCount; i++) {
      if (offset_position <= this.lineEnds_[i]) {
        offset_line = i;
        break;
      }
    }