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|
package lexer
import (
"testing"
"github.com/mewsen/interpreter/token"
)
func TestNextToken(t *testing.T) {
input := `
let five = 5;
let ten = 10;
let add = fn(x, y) {
x + y;
};
let result = add(five, ten);
!-/*5;
5 < 10 > 5;
if (5 < 10) {
return true;
} else {
return false;
}
`
tests := []struct {
expectedType token.TokenType
expectedLiteral string
}{
{token.LET, "let"},
{token.IDENT, "five"},
{token.ASSIGN, "="},
{token.INT, "5"},
{token.SEMICOLON, ";"},
{token.LET, "let"},
{token.IDENT, "ten"},
{token.ASSIGN, "="},
{token.INT, "10"},
{token.SEMICOLON, ";"},
{token.LET, "let"},
{token.IDENT, "add"},
{token.ASSIGN, "="},
{token.FUNCTION, "fn"},
{token.LPAREN, "("},
{token.IDENT, "x"},
{token.COMMA, ","},
{token.IDENT, "y"},
{token.RPAREN, ")"},
{token.LBRACE, "{"},
{token.IDENT, "x"},
{token.PLUS, "+"},
{token.IDENT, "y"},
{token.SEMICOLON, ";"},
{token.RBRACE, "}"},
{token.SEMICOLON, ";"},
{token.LET, "let"},
{token.IDENT, "result"},
{token.ASSIGN, "="},
{token.IDENT, "add"},
{token.LPAREN, "("},
{token.IDENT, "five"},
{token.COMMA, ","},
{token.IDENT, "ten"},
{token.RPAREN, ")"},
{token.SEMICOLON, ";"},
{token.BANG, "!"},
{token.MINUS, "-"},
{token.SLASH, "/"},
{token.ASTERISK, "*"},
{token.INT, "5"},
{token.SEMICOLON, ";"},
{token.INT, "5"},
{token.LT, "<"},
{token.INT, "10"},
{token.GT, ">"},
{token.INT, "5"},
{token.SEMICOLON, ";"},
{token.IF, "if"},
{token.LPAREN, "("},
{token.INT, "5"},
{token.LT, "<"},
{token.INT, "10"},
{token.RPAREN, ")"},
{token.LBRACE, "{"},
{token.RETURN, "return"},
{token.TRUE, "true"},
{token.SEMICOLON, ";"},
{token.RBRACE, "}"},
{token.ELSE, "else"},
{token.LBRACE, "{"},
{token.RETURN, "return"},
{token.FALSE, "false"},
{token.SEMICOLON, ";"},
{token.RBRACE, "}"},
{token.EOF, ""},
}
l := New(input)
for i, tt := range tests {
tok := l.NextToken()
if tok.Type != tt.expectedType {
t.Fatalf("tests[%d] - tokentype wrong, expected=%v, got=%v",
i, tt.expectedType, tok.Type)
}
if tok.Literal != tt.expectedLiteral {
t.Fatalf("tests[%d] - literal wrong, expected=%v, got=%v",
i, tt.expectedLiteral, tok.Literal)
}
}
}
|
