67 lines
1.2 KiB
Go
67 lines
1.2 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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let x = 5;
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let y = 10;
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let foobar = 838383;
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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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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.Statements does not contain 3 statements. got=%d",
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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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stmt := program.Statements[i]
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if !testLetStatement(t, stmt, 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 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("s.Name not '%s'. got=%s", name, letStmt.Name)
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return false
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}
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return true
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}
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