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package parser
import (
"fmt"
"sort"
"github.com/robertkrimen/otto/file"
"github.com/robertkrimen/otto/token"
)
const (
err_UnexpectedToken = "Unexpected token %v"
err_UnexpectedEndOfInput = "Unexpected end of input"
err_UnexpectedEscape = "Unexpected escape"
)
// UnexpectedNumber: 'Unexpected number',
// UnexpectedString: 'Unexpected string',
// UnexpectedIdentifier: 'Unexpected identifier',
// UnexpectedReserved: 'Unexpected reserved word',
// NewlineAfterThrow: 'Illegal newline after throw',
// InvalidRegExp: 'Invalid regular expression',
// UnterminatedRegExp: 'Invalid regular expression: missing /',
// InvalidLHSInAssignment: 'Invalid left-hand side in assignment',
// InvalidLHSInForIn: 'Invalid left-hand side in for-in',
// MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
// NoCatchOrFinally: 'Missing catch or finally after try',
// UnknownLabel: 'Undefined label \'%0\'',
// Redeclaration: '%0 \'%1\' has already been declared',
// IllegalContinue: 'Illegal continue statement',
// IllegalBreak: 'Illegal break statement',
// IllegalReturn: 'Illegal return statement',
// StrictModeWith: 'Strict mode code may not include a with statement',
// StrictCatchVariable: 'Catch variable may not be eval or arguments in strict mode',
// StrictVarName: 'Variable name may not be eval or arguments in strict mode',
// StrictParamName: 'Parameter name eval or arguments is not allowed in strict mode',
// StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
// StrictFunctionName: 'Function name may not be eval or arguments in strict mode',
// StrictOctalLiteral: 'Octal literals are not allowed in strict mode.',
// StrictDelete: 'Delete of an unqualified identifier in strict mode.',
// StrictDuplicateProperty: 'Duplicate data property in object literal not allowed in strict mode',
// AccessorDataProperty: 'Object literal may not have data and accessor property with the same name',
// AccessorGetSet: 'Object literal may not have multiple get/set accessors with the same name',
// StrictLHSAssignment: 'Assignment to eval or arguments is not allowed in strict mode',
// StrictLHSPostfix: 'Postfix increment/decrement may not have eval or arguments operand in strict mode',
// StrictLHSPrefix: 'Prefix increment/decrement may not have eval or arguments operand in strict mode',
// StrictReservedWord: 'Use of future reserved word in strict mode'
// A SyntaxError is a description of an ECMAScript syntax error.
// An Error represents a parsing error. It includes the position where the error occurred and a message/description.
type Error struct {
Position file.Position
Message string
}
// FIXME Should this be "SyntaxError"?
func (self Error) Error() string {
filename := self.Position.Filename
if filename == "" {
filename = "(anonymous)"
}
return fmt.Sprintf("%s: Line %d:%d %s",
filename,
self.Position.Line,
self.Position.Column,
self.Message,
)
}
func (self *_parser) error(place interface{}, msg string, msgValues ...interface{}) *Error {
idx := file.Idx(0)
switch place := place.(type) {
case int:
idx = self.idxOf(place)
case file.Idx:
if place == 0 {
idx = self.idxOf(self.chrOffset)
} else {
idx = place
}
default:
panic(fmt.Errorf("error(%T, ...)", place))
}
position := self.position(idx)
msg = fmt.Sprintf(msg, msgValues...)
self.errors.Add(position, msg)
return self.errors[len(self.errors)-1]
}
func (self *_parser) errorUnexpected(idx file.Idx, chr rune) error {
if chr == -1 {
return self.error(idx, err_UnexpectedEndOfInput)
}
return self.error(idx, err_UnexpectedToken, token.ILLEGAL)
}
func (self *_parser) errorUnexpectedToken(tkn token.Token) error {
switch tkn {
case token.EOF:
return self.error(file.Idx(0), err_UnexpectedEndOfInput)
}
value := tkn.String()
switch tkn {
case token.BOOLEAN, token.NULL:
value = self.literal
case token.IDENTIFIER:
return self.error(self.idx, "Unexpected identifier")
case token.KEYWORD:
// TODO Might be a future reserved word
return self.error(self.idx, "Unexpected reserved word")
case token.NUMBER:
return self.error(self.idx, "Unexpected number")
case token.STRING:
return self.error(self.idx, "Unexpected string")
}
return self.error(self.idx, err_UnexpectedToken, value)
}
// ErrorList is a list of *Errors.
//
type ErrorList []*Error
// Add adds an Error with given position and message to an ErrorList.
func (self *ErrorList) Add(position file.Position, msg string) {
*self = append(*self, &Error{position, msg})
}
// Reset resets an ErrorList to no errors.
func (self *ErrorList) Reset() { *self = (*self)[0:0] }
func (self ErrorList) Len() int { return len(self) }
func (self ErrorList) Swap(i, j int) { self[i], self[j] = self[j], self[i] }
func (self ErrorList) Less(i, j int) bool {
x := &self[i].Position
y := &self[j].Position
if x.Filename < y.Filename {
return true
}
if x.Filename == y.Filename {
if x.Line < y.Line {
return true
}
if x.Line == y.Line {
return x.Column < y.Column
}
}
return false
}
func (self ErrorList) Sort() {
sort.Sort(self)
}
// Error implements the Error interface.
func (self ErrorList) Error() string {
switch len(self) {
case 0:
return "no errors"
case 1:
return self[0].Error()
}
return fmt.Sprintf("%s (and %d more errors)", self[0].Error(), len(self)-1)
}
// Err returns an error equivalent to this ErrorList.
// If the list is empty, Err returns nil.
func (self ErrorList) Err() error {
if len(self) == 0 {
return nil
}
return self
}
|
