121 lines
2.3 KiB
Go
121 lines
2.3 KiB
Go
package parser
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import (
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"testing"
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"gointerpreter/ast"
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"gointerpreter/lexer"
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)
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func Test_LetStatement(t *testing.T) {
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input := `
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let x = 5;
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let y = 10;
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let foobar = 324453;
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`
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l := lexer.New(input)
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p := New(l)
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program := p.ParseProgram()
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checkParserErrors(t, p)
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if program == nil {
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t.Fatalf("ParseProgram() returned nil")
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}
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if len(program.Statements) != 3 {
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t.Fatalf("program.Statement does not contained 3 statements, got [%d]", len(program.Statements))
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}
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tests := []struct {
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expectedIdentifier string
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}{
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{"x"},
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{"y"},
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{"foobar"},
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}
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for i, tt := range tests {
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statement := program.Statements[i]
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if !testLetStatement(t, statement, tt.expectedIdentifier) {
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return
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}
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}
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}
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func testLetStatement(t *testing.T, s ast.Statement, name string) bool {
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if s.TokenLiteral() != "let" {
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t.Errorf("s.TokenLiteral() is not [let], got [%s]", s.TokenLiteral())
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return false
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}
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letStatement, ok := s.(*ast.LetStatement)
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if !ok {
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t.Errorf("s is not a *ast.LetStatement, got [%T]", s)
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return false
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}
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if letStatement.Name.Value != name {
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t.Errorf("letStatement.Name.Value is not [%s], got [%s]", name, letStatement.Name.Value)
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return false
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}
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if letStatement.Name.TokenLiteral() != name {
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t.Errorf("letStatement.TokenLiteral() is not [%s], got [%s]", name, letStatement.TokenLiteral())
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return false
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}
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return true
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}
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func checkParserErrors(t *testing.T, p *Parser) {
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errors := p.Errors()
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if len(errors) == 0 {
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return
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}
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t.Errorf("parser has [%d] errors", len(errors))
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for _, e := range errors {
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t.Errorf("parser error: %q", e)
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}
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t.FailNow()
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}
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func Test_ReturnStatement(t *testing.T) {
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input := `
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return 5;
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return 10;
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return 234342;
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`
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l := lexer.New(input)
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p := New(l)
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program := p.ParseProgram()
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checkParserErrors(t, p)
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if program == nil {
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t.Fatalf("ParseProgram() returned nil")
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}
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if len(program.Statements) != 3 {
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t.Fatalf("program.Statement does not contained 3 statements, got [%d]", len(program.Statements))
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}
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for _, stmt := range program.Statements {
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returnStmt, ok := stmt.(*ast.ReturnStatement)
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if !ok {
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t.Errorf("stmt is not *ast.ReturnStatement, got [%T]", stmt)
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continue
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}
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if returnStmt.TokenLiteral() != "return" {
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t.Errorf("returnStmt.TokenLiteral() is not [return], got [%q]", returnStmt.TokenLiteral())
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}
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}
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}
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