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86 lines
1.3 KiB
Go
86 lines
1.3 KiB
Go
package lox
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import (
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"bufio"
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"fmt"
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"golox/ast"
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"golox/parser"
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"golox/scanner"
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"golox/token"
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"os"
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)
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type Lox struct {
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hadError bool
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}
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func New() *Lox {
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return &Lox{hadError: false}
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}
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func (l *Lox) RunFile(path string) {
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bytes, err := os.ReadFile(path)
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if err != nil {
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fmt.Println("Error reading file", path)
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os.Exit(74)
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}
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l.run(string(bytes))
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if l.hadError {
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os.Exit(65)
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}
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}
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func (l *Lox) RunPrompt() {
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reader := bufio.NewReader(os.Stdin)
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for {
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fmt.Print("> ")
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line, err := reader.ReadString('\n')
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if err != nil {
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fmt.Println(err)
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os.Exit(74)
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}
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if line == "\n" {
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break
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}
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l.run(line)
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l.hadError = false
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}
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}
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func (l *Lox) Error(line int, message string) {
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l.report(line, "", message)
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}
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func (l *Lox) ErrorAtToken(t token.Token, message string) {
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if t.Type == token.EOF {
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l.report(t.Line, " at end", message)
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} else {
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l.report(t.Line, " at '"+t.Lexeme+"'", message)
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}
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}
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func (l *Lox) report(line int, where string, message string) {
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fmt.Printf("[line %d] Error %s: %s\n", line, where, message)
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l.hadError = true
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}
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func (l *Lox) run(source string) {
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scanner := scanner.New(source, l)
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tokens := scanner.ScanTokens()
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parser := parser.New(tokens, l)
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expr := parser.Parse()
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if l.hadError {
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return
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}
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p := ast.New()
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fmt.Println(p.Print(expr))
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}
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