tjlawal/monna
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Stubborn bug, could not figure out what causing it. Will just re-write the entire thing.

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```panic: runtime error: invalid memory address or nil pointer dereference [recovered] 
        panic: runtime error: invalid memory address or nil pointer dereference     
[signal 0xc0000005 code=0x0 addr=0x10 pc=0xbcf660]                                  
                                                                                    
goroutine 6 [running]:                                                              
testing.tRunner.func1.2({0xbe4c60, 0xce2c10})                                       
        C:/Program Files/Go/src/testing/testing.go:1389 +0x24e                      
testing.tRunner.func1()                                                             
        C:/Program Files/Go/src/testing/testing.go:1392 +0x39f                      
panic({0xbe4c60, 0xce2c10})                                                         
        C:/Program Files/Go/src/runtime/panic.go:838 +0x207                         
monkey/ast.(*LetStatement).TokenLiteral(0xc000022940?)                              
        D:/monkey/ast/ast.go:37                                                     
monkey/parser.testLetStatement(0xc000132000, {0xc32638, 0x0}, {0xc0106a, 0x1})      
        D:/monkey/parser/parser_test.go:43 +0x49                                    
monkey/parser.TestLetStatements(0xc000132000)                                       
        D:/monkey/parser/parser_test.go:36 +0x1ba                                   
testing.tRunner(0xc000132000, 0xc0d940)                                             
        C:/Program Files/Go/src/testing/testing.go:1439 +0x102                      
created by testing.(*T).Run                                                         
        C:/Program Files/Go/src/testing/testing.go:1486 +0x35f                      
FAIL    monkey/parser   0.180s                                                      
FAIL
```

git-svn-id: https://svn.tlawal.org/svn/monkey@16 f6afcba9-9ef1-4bdd-9b72-7484f5705bac
This commit is contained in:
Tijani Lawal 2022-05-26 16:35:08 +00:00
parent 4f90d0cbd1
commit b8e8fc8b6e
2 changed files with 0 additions and 99 deletions
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35
parser/parser.go
View File

@ -1,35 +0,0 @@
package parser
import (
"monkey/ast"
"monkey/lexer"
"monkey/token"
)
type Parser struct {
lexer *lexer.Lexer
current_token token.Token
peek_token token.Token
}
func New(l_lexer *lexer.Lexer) *Parser {
l_parser := &Parser{lexer: l_lexer}
// Read two tokens, one for curren_token and another for peek_token
l_parser.next_token()
l_parser.next_token()
return l_parser
}
// When this is first called, current_token and peek_token should point to the same
// token
func (l_parser *Parser) next_token() {
l_parser.current_token = l_parser.peek_token
l_parser.peek_token = l_parser.lexer.NextToken()
}
func (l_parser *Parser) ParseProgram() *ast.Program {
return nil
}

64
parser/parser_test.go
View File

@ -1,64 +0,0 @@
package parser
import (
"monkey/ast"
"monkey/lexer"
"testing"
)
func TestLetStatements(t *testing.T) {
input := `
let x = 5;
let y = 10;
let foobar = 839893;
`
l_lexer := lexer.New(input)
l_parser := New(l_lexer)
program := l_parser.ParseProgram()
if program == nil {
t.Fatalf("ParseProgram() returned nil")
}
if len(program.Statements) != 3 {
t.Fatalf("program.Statements does not contail 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.TokenLiteral() != name {
t.Errorf("letStmt.Name.TokenLiteral() not '%s', got =%s", name, letStmt.Name.TokenLiteral())
return false
}
if letStmt.Name.Value != name {
t.Errorf("letStmt.Name.Value not '%s', got =%s", name, letStmt.Name.Value)
return false
}
return true
}