76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
package parser
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import (
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"monkey/ast"
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"monkey/lexer"
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"testing"
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)
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func TestLetStatements(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 993322;
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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 len(program.Statements) != 3 {
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t.Fatalf("program.Statements does not contain 3 statements. got=%d",
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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 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 not 'return', got %q",
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returnStmt.TokenLiteral())
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}
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}
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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 _, msg := range errors {
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t.Errorf("parser error %q", msg)
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}
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t.FailNow()
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}
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func testLetStatements(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 not 'let'. got=%q", s.TokenLiteral())
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return false
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}
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letStmt, ok := s.(*ast.LetStatement)
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if !ok {
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t.Errorf("s not *ast.LetStatement. got=%T", s)
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return false
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}
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if letStmt.Name.Value != name {
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t.Errorf("letStmt.Name.Value not '%s'. got=%s", name, letStmt.Name.Value)
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return false
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}
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if letStmt.Name.TokenLiteral() != name {
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t.Errorf("letStmt.Name.TokenLiteral not '%s'. got=%s", name, letStmt.Name.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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