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92 lines
2.0 KiB
Go
92 lines
2.0 KiB
Go
package parser
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import (
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"golox/ast"
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"golox/errors"
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"golox/token"
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"testing"
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)
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func TestParser(t *testing.T) {
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tests := []struct {
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name string
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tokens []token.Token
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expected string
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}{
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{
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name: "Simple expression",
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tokens: []token.Token{
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{Type: token.NUMBER, Literal: 1},
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{Type: token.PLUS, Lexeme: "+"},
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{Type: token.NUMBER, Literal: 2},
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{Type: token.EOF},
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},
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expected: "(+ 1 2)",
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},
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{
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name: "Unary expression",
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tokens: []token.Token{
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{Type: token.MINUS, Lexeme: "-"},
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{Type: token.NUMBER, Literal: 123},
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{Type: token.EOF},
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},
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expected: "(- 123)",
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},
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{
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name: "Grouping expression",
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tokens: []token.Token{
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{Type: token.LEFT_PAREN, Lexeme: "("},
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{Type: token.NUMBER, Literal: 1},
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{Type: token.PLUS, Lexeme: "+"},
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{Type: token.NUMBER, Literal: 2},
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{Type: token.RIGHT_PAREN, Lexeme: ")"},
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{Type: token.EOF},
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},
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expected: "(group (+ 1 2))",
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},
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{
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name: "Comparison expression",
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tokens: []token.Token{
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{Type: token.NUMBER, Literal: 1},
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{Type: token.GREATER, Lexeme: ">"},
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{Type: token.NUMBER, Literal: 2},
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{Type: token.EOF},
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},
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expected: "(> 1 2)",
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},
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{
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name: "Equality expression",
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tokens: []token.Token{
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{Type: token.NUMBER, Literal: 1},
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{Type: token.EQUAL_EQUAL, Lexeme: "=="},
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{Type: token.NUMBER, Literal: 2},
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{Type: token.EOF},
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},
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expected: "(== 1 2)",
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},
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{
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name: "Parsing error - missing right parenthesis",
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tokens: []token.Token{
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{Type: token.LEFT_PAREN, Lexeme: "("},
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{Type: token.NUMBER, Literal: 1},
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{Type: token.PLUS, Lexeme: "+"},
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{Type: token.NUMBER, Literal: 2},
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{Type: token.EOF},
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},
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expected: "Expect ')' after expression.",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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parser := New(tt.tokens, errors.NewMockErrorLogger())
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expr := parser.Parse()
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ap := ast.NewPrinter()
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s := ap.Print(expr)
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if s != tt.expected {
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t.Errorf("expected %v, got %v", tt.expected, s)
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}
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})
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}
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}
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