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package parser
import (
"github.com/mewsen/interpreter/ast"
"github.com/mewsen/interpreter/lexer"
"testing"
)
func TestLetStatements(t *testing.T) {
input := `
let x = 5;
let y = 10;
let foobar = 838383;
`
l := lexer.New(input)
p := New(l)
program := p.ParseProgram()
if program == nil {
t.Fatalf("ParseProgram() returned nil")
}
if len(program.Statements) != 3 {
t.Fatalf("program.Statements does not contain 3 statements. got=%d",
len(program.Statements))
}
tests := []struct {
expectedIdentifier string
}{
{"x"},
{"y"},
{"foobar"},
}
for i, tt := range tests {
stmt := program.Statements[i]
if !testLetStatement(t, stmt, tt.expectedIdentifier) {
return
}
}
}
func testLetStatement(t *testing.T, s ast.Statement, name string) bool {
if s.TokenLiteral() != "let" {
t.Errorf("s.TokenLiteral not 'let'. got=%q", s.TokenLiteral())
return false
}
letStmt, ok := s.(*ast.LetStatement)
if !ok {
t.Errorf("s not *ast.LetStatement. got=%T", s)
return false
}
if letStmt.Name.Value != name {
t.Errorf("letStmt.Name.Value not '%s'. got =%s", name, letStmt.Name.Value)
return false
}
if letStmt.Name.TokenLiteral() != name {
t.Errorf("s.Name not '%s'. got=%s", name, letStmt.Name)
return false
}
return true
}
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