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) 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)
}
func TestLexer(t *testing.T) {
tt(t, func() {
setup := func(src string) *_parser {
parser := newParser("", src)
return parser
}
test := func(src string, test ...interface{}) {
parser := setup(src)
for len(test) > 0 {
tkn, literal, idx := parser.scan()
if len(test) > 0 {
is(tkn, test[0].(token.Token))
test = test[1:]
}
if len(test) > 0 {
is(literal, test[0].(string))
test = test[1:]
}
if len(test) > 0 {
// FIXME terst, Fix this so that cast to file.Idx is not necessary?
is(idx, file.Idx(test[0].(int)))
test = test[1:]
}
}
}
test("",
token.EOF, "", 1,
)
test("1",
token.NUMBER, "1", 1,
token.EOF, "", 2,
)
test(".0",
token.NUMBER, ".0", 1,
token.EOF, "", 3,
)
test("abc",
token.IDENTIFIER, "abc", 1,
token.EOF, "", 4,
)
test("abc(1)",
token.IDENTIFIER, "abc", 1,
token.LEFT_PARENTHESIS, "", 4,
token.NUMBER, "1", 5,
token.RIGHT_PARENTHESIS, "", 6,
token.EOF, "", 7,
)
test(".",
token.PERIOD, "", 1,
token.EOF, "", 2,
)
test("===.",
token.STRICT_EQUAL, "", 1,
token.PERIOD, "", 4,
token.EOF, "", 5,
)
test(">>>=.0",
token.UNSIGNED_SHIFT_RIGHT_ASSIGN, "", 1,
token.NUMBER, ".0", 5,
token.EOF, "", 7,
)
test(">>>=0.0.",
token.UNSIGNED_SHIFT_RIGHT_ASSIGN, "", 1,
token.NUMBER, "0.0", 5,
token.PERIOD, "", 8,
token.EOF, "", 9,
)
test("\"abc\"",
token.STRING, "\"abc\"", 1,
token.EOF, "", 6,
)
test("abc = //",
token.IDENTIFIER, "abc", 1,
token.ASSIGN, "", 5,
token.EOF, "", 9,
)
test("abc = 1 / 2",
token.IDENTIFIER, "abc", 1,
token.ASSIGN, "", 5,
token.NUMBER, "1", 7,
token.SLASH, "", 9,
token.NUMBER, "2", 11,
token.EOF, "", 12,
)
test("xyzzy = 'Nothing happens.'",
token.IDENTIFIER, "xyzzy", 1,
token.ASSIGN, "", 7,
token.STRING, "'Nothing happens.'", 9,
token.EOF, "", 27,
)
test("abc = !false",
token.IDENTIFIER, "abc", 1,
token.ASSIGN, "", 5,
token.NOT, "", 7,
token.BOOLEAN, "false", 8,
token.EOF, "", 13,
)
test("abc = !!true",
token.IDENTIFIER, "abc", 1,
token.ASSIGN, "", 5,
token.NOT, "", 7,
token.NOT, "", 8,
token.BOOLEAN, "true", 9,
token.EOF, "", 13,
)
test("abc *= 1",
token.IDENTIFIER, "abc", 1,
token.MULTIPLY_ASSIGN, "", 5,
token.NUMBER, "1", 8,
token.EOF, "", 9,
)
test("if 1 else",
token.IF, "if", 1,
token.NUMBER, "1", 4,
token.ELSE, "else", 6,
token.EOF, "", 10,
)
test("null",
token.NULL, "null", 1,
token.EOF, "", 5,
)
test(`"\u007a\x79\u000a\x78"`,
token.STRING, "\"\\u007a\\x79\\u000a\\x78\"", 1,
token.EOF, "", 23,
)
test(`"[First line \
Second line \
Third line\
. ]"
`,
token.STRING, "\"[First line \\\nSecond line \\\n Third line\\\n. ]\"", 1,
token.EOF, "", 53,
)
test("/",
token.SLASH, "", 1,
token.EOF, "", 2,
)
test("var abc = \"abc\uFFFFabc\"",
token.VAR, "var", 1,
token.IDENTIFIER, "abc", 5,
token.ASSIGN, "", 9,
token.STRING, "\"abc\uFFFFabc\"", 11,
token.EOF, "", 22,
)
test(`'\t' === '\r'`,
token.STRING, "'\\t'", 1,
token.STRICT_EQUAL, "", 6,
token.STRING, "'\\r'", 10,
token.EOF, "", 14,
)
test(`var \u0024 = 1`,
token.VAR, "var", 1,
token.IDENTIFIER, "$", 5,
token.ASSIGN, "", 12,
token.NUMBER, "1", 14,
token.EOF, "", 15,
)
test("10e10000",
token.NUMBER, "10e10000", 1,
token.EOF, "", 9,
)
test(`var if var class`,
token.VAR, "var", 1,
token.IF, "if", 5,
token.VAR, "var", 8,
token.KEYWORD, "class", 12,
token.EOF, "", 17,
)
test(`-0`,
token.MINUS, "", 1,
token.NUMBER, "0", 2,
token.EOF, "", 3,
)
test(`.01`,
token.NUMBER, ".01", 1,
token.EOF, "", 4,
)
test(`.01e+2`,
token.NUMBER, ".01e+2", 1,
token.EOF, "", 7,
)
test(";",
token.SEMICOLON, "", 1,
token.EOF, "", 2,
)
test(";;",
token.SEMICOLON, "", 1,
token.SEMICOLON, "", 2,
token.EOF, "", 3,
)
test("//",
token.EOF, "", 3,
)
test(";;//",
token.SEMICOLON, "", 1,
token.SEMICOLON, "", 2,
token.EOF, "", 5,
)
test("1",
token.NUMBER, "1", 1,
)
test("12 123",
token.NUMBER, "12", 1,
token.NUMBER, "123", 4,
)
test("1.2 12.3",
token.NUMBER, "1.2", 1,
token.NUMBER, "12.3", 5,
)
test("/ /=",
token.SLASH, "", 1,
token.QUOTIENT_ASSIGN, "", 3,
)
test(`"abc"`,
token.STRING, `"abc"`, 1,
)
test(`'abc'`,
token.STRING, `'abc'`, 1,
)
test("++",
token.INCREMENT, "", 1,
)
test(">",
token.GREATER, "", 1,
)
test(">=",
token.GREATER_OR_EQUAL, "", 1,
)
test(">>",
token.SHIFT_RIGHT, "", 1,
)
test(">>=",
token.SHIFT_RIGHT_ASSIGN, "", 1,
)
test(">>>",
token.UNSIGNED_SHIFT_RIGHT, "", 1,
)
test(">>>=",
token.UNSIGNED_SHIFT_RIGHT_ASSIGN, "", 1,
)
test("1 \"abc\"",
token.NUMBER, "1", 1,
token.STRING, "\"abc\"", 3,
)
test(",",
token.COMMA, "", 1,
)
test("1, \"abc\"",
token.NUMBER, "1", 1,
token.COMMA, "", 2,
token.STRING, "\"abc\"", 4,
)
test("new abc(1, 3.14159);",
token.NEW, "new", 1,
token.IDENTIFIER, "abc", 5,
token.LEFT_PARENTHESIS, "", 8,
token.NUMBER, "1", 9,
token.COMMA, "", 10,
token.NUMBER, "3.14159", 12,
token.RIGHT_PARENTHESIS, "", 19,
token.SEMICOLON, "", 20,
)
test("1 == \"1\"",
token.NUMBER, "1", 1,
token.EQUAL, "", 3,
token.STRING, "\"1\"", 6,
)
test("1\n[]\n",
token.NUMBER, "1", 1,
token.LEFT_BRACKET, "", 3,
token.RIGHT_BRACKET, "", 4,
)
test("1\ufeff[]\ufeff",
token.NUMBER, "1", 1,
token.LEFT_BRACKET, "", 5,
token.RIGHT_BRACKET, "", 6,
)
// ILLEGAL
test(`3ea`,
token.ILLEGAL, "3e", 1,
token.IDENTIFIER, "a", 3,
token.EOF, "", 4,
)
test(`3in`,
token.ILLEGAL, "3", 1,
token.IN, "in", 2,
token.EOF, "", 4,
)
test("\"Hello\nWorld\"",
token.ILLEGAL, "", 1,
token.IDENTIFIER, "World", 8,
token.ILLEGAL, "", 13,
token.EOF, "", 14,
)
test("\u203f = 10",
token.ILLEGAL, "", 1,
token.ASSIGN, "", 5,
token.NUMBER, "10", 7,
token.EOF, "", 9,
)
test(`"\x0G"`,
token.STRING, "\"\\x0G\"", 1,
token.EOF, "", 7,
)
})
}
func (self *VariableExpression) Idx1() file.Idx {
if self.Initializer == nil {
return file.Idx(int(self.Idx) + len(self.Name) + 1)
}
return self.Initializer.Idx1()
}
func (self *StringLiteral) Idx1() file.Idx { return file.Idx(int(self.Idx) + len(self.Literal)) }
func (self *RegExpLiteral) Idx1() file.Idx { return file.Idx(int(self.Idx) + len(self.Literal)) }
func (self *NumberLiteral) Idx1() file.Idx { return file.Idx(int(self.Idx) + len(self.Literal)) }
func (self *NullLiteral) Idx1() file.Idx { return file.Idx(int(self.Idx) + 4) } // "null"
func (self *Identifier) Idx1() file.Idx { return file.Idx(int(self.Idx) + len(self.Name)) }
func (self *BooleanLiteral) Idx1() file.Idx { return file.Idx(int(self.Idx) + len(self.Literal)) }
func (self *_parser) idxOf(offset int) file.Idx {
return file.Idx(self.base + offset)
}