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package lexer
import (
"monkey/pkg/token"
"testing"
)
func TestNextTokenBasic(t *testing.T) {
input := `=+(){},;`
tests := []struct {
expectedType token.TokenType
expectedLiteral string
}{
{token.ASSIGN, "="},
{token.PLUS, "+"},
{token.LPAREN, "("},
{token.RPAREN, ")"},
{token.LBRACE, "{"},
{token.RBRACE, "}"},
{token.COMMA, ","},
{token.SEMICOLON, ";"},
}
l := New(input)
for i, tt := range tests {
tok := l.NextToken()
if tok.Type != tt.expectedType {
t.Fatalf("tests[%d] - tokentype wrong. expected=%q, got=%q", i, tt.expectedType, tok.Type)
}
if tok.Literal != tt.expectedLiteral {
t.Fatalf("tests[%d] - tokenliteral wrong. expected=%q, got=%q", i, tt.expectedLiteral, tok.Literal)
}
}
}
func TestNextTokenMonkey(t *testing.T) {
input := `let five = 5;
let ten = 10;
let add = fn(x, y) {
x + y
};
let result = add(five, ten);`
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.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, ";"},
}
l := New(input)
for i, tt := range tests {
tok := l.NextToken()
if tok.Type != tt.expectedType {
t.Fatalf("tests[%d] - tokentype wrong. expected=%q, got=%q", i, tt.expectedType, tok.Type)
}
if tok.Literal != tt.expectedLiteral {
t.Fatalf("tests[%d] - tokenliteral wrong. expected=%q, got=%q", i, tt.expectedLiteral, tok.Literal)
}
}
}
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