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run.go
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run.go
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package main
import (
"bufio"
"errors"
"fmt"
"os"
"strings"
"github.com/jesperkha/Fizz/env"
"github.com/jesperkha/Fizz/interp"
"github.com/jesperkha/Fizz/lib"
"github.com/jesperkha/Fizz/stmt"
"github.com/jesperkha/Fizz/term"
"github.com/jesperkha/Fizz/util"
)
var (
ErrOneArgOnly = errors.New("expected a single argument, got %d")
validArgs = []string{"--help", "--version", "-f", "-e"}
)
func RunInterpreter() {
parser, err := term.Parse(validArgs)
if err != nil {
util.ErrorAndExit(err)
}
args := parser.Args()
if len(args) > 1 {
util.ErrorAndExit(fmt.Errorf(ErrOneArgOnly.Error(), len(args)))
}
// Early exit options
if parser.HasOption("help") {
fmt.Println(term.HELP)
return
} else if parser.HasOption("version") {
fmt.Printf("Fizz %s\n", VERSION)
return
}
// Subcommands
switch parser.SubCommand() {
case "docs":
if err := lib.PrintDocs(args[0]); err != nil {
util.ErrorAndExit(err)
}
return
case "help":
if msg, ok := term.CommandDescriptions[args[0]]; ok {
fmt.Println(msg)
} else {
util.PrintError(fmt.Errorf(term.ErrUnknownCommand.Error(), args[0]))
}
return
}
// Run terminal mode if no other args are given
if len(args) == 0 {
RunTerminal()
return
}
// Goto directory of file specified
split := strings.Split(args[0], "/")
path := strings.Join(split[:len(split)-1], "/")
name := split[len(split)-1]
os.Chdir(path)
// Run file
e, err := interp.RunFile(name)
// Print global environment if flag is set first
if parser.HasFlag("e") {
fmt.Println(util.FormatPrintValue(e))
}
// Handle error
if err != nil && err != stmt.ErrProgramExit {
util.PrintError(err)
if c := env.GetCallstack(); parser.HasFlag("f") && len(c) > 0 {
util.PrintError(fmt.Errorf(c))
}
os.Exit(1)
}
}
// Leaves the interpreter running as the user inputs code to the terminal.
// Prints out errors but does not terminate until ^C or 'exit'.
func RunTerminal() {
fmt.Println("type 'exit' to terminate session")
scanner := bufio.NewScanner(os.Stdin)
numBlocks, line := 0, 1
totalString, space := "", " "
env.ThrowEnvironment = false
for {
fmt.Printf("%d%s : %s", line, space, strings.Repeat(" ", numBlocks))
scanner.Scan()
input := scanner.Text()
if input == "exit" {
break
}
// Continue with indent after braces
numBlocks += strings.Count(input, "{") - strings.Count(input, "}")
totalString += input + "\n" // Better error handling
if numBlocks <= 0 {
if _, err := interp.Interperate("", totalString); err != nil {
util.PrintError(err)
line--
}
totalString = ""
numBlocks = 0
}
line++
if line == 10 {
space = ""
}
}
fmt.Println("session ended")
}