prosper/main.go

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package main
import (
"bufio"
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"errors"
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"fmt"
"os"
"strings"
)
func main() {
stack := Stack{values: []int{}}
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rstack := Stack{values: []int{}}
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ifstack := Stack{values: []int{}}
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dict := Dictionary{}
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c := Context{
Dictionary: dict,
Stack: &stack,
RStack: &rstack,
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IfStack: &ifstack,
Flags: Flags{
"Immediate": true,
},
Words: []string{},
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}
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b := &Builtins{}
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// word definitions
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dict.AddWord(":", Word{Name: ":", Impl: b.Colon(&c)})
dict.AddWord(";", Word{Name: ";", Impl: b.Semicolon(&c), Immediate: true})
// comments
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dict.AddWord("(", Word{Name: "(", Impl: b.OpenComment(&c), Immediate: true})
dict.AddWord(")", Word{Name: ")", Impl: b.CloseComment(&c), Immediate: true})
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// math
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dict.AddWord("+", Word{Name: "+", Impl: b.Add(&stack)})
dict.AddWord("-", Word{Name: "-", Impl: b.Sub(&stack)})
dict.AddWord("*", Word{Name: "*", Impl: b.Mul(&stack)})
dict.AddWord("/", Word{Name: "/", Impl: b.Div(&stack)})
dict.AddWord("MOD", Word{Name: "MOD", Impl: b.Mod(&stack)})
dict.AddWord("/MOD", Word{Name: "/MOD", Source: []string{"2DUP", "MOD", "ROT", "ROT", "/"}})
dict.AddWord("1+", Word{Name: "1+", Source: []string{"1", "+"}})
dict.AddWord("1-", Word{Name: "1-", Source: []string{"1", "-"}})
dict.AddWord("ABS", Word{Name: "ABS", Source: []string{"DUP", "0<", "IF", "NEGATE", "THEN"}})
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dict.AddWord("NEGATE", Word{Name: "NEGATE", Source: []string{"-1", "*"}})
dict.AddWord("MAX", Word{Name: "MAX", Source: []string{"2DUP", "<", "IF", "SWAP", "THEN", "DROP"}})
dict.AddWord("MIN", Word{Name: "MIN", Source: []string{"2DUP", ">", "IF", "SWAP", "THEN", "DROP"}})
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// output
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dict.AddWord(".", Word{Name: ".", Impl: b.Print(os.Stdout, &stack)})
dict.AddWord("EMIT", Word{Name: "EMIT", Impl: b.Emit(os.Stdout, &stack)})
dict.AddWord("CR", Word{Name: "CR", Source: []string{"10", "EMIT"}}) // emit a newline
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// logic
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dict.AddWord("=", Word{Name: "=", Impl: b.Eq(&stack)})
dict.AddWord("0=", Word{Name: "0=", Source: []string{"0", "="}})
dict.AddWord("<>", Word{Name: "<>", Impl: b.NEq(&stack)})
dict.AddWord("0<>", Word{Name: "0<>", Source: []string{"0=", "0="}})
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dict.AddWord(">", Word{Name: ">", Impl: b.Gt(&stack)})
dict.AddWord("<", Word{Name: "<", Impl: b.Lt(&stack)})
dict.AddWord(">=", Word{Name: ">=", Impl: b.GtEq(&stack)})
dict.AddWord("<=", Word{Name: "<=", Impl: b.LtEq(&stack)})
dict.AddWord("0<", Word{Name: "0<", Source: []string{"0", "<"}})
dict.AddWord("0>", Word{Name: "0>", Source: []string{"0", ">"}})
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// stack manipulation
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dict.AddWord("DUP", Word{Name: "DUP", Impl: b.Dup(&stack)})
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dict.AddWord("?DUP", Word{Name: "?DUP", Source: []string{"DUP", "0<>", "IF", "DUP", "THEN"}})
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dict.AddWord("SWAP", Word{Name: "SWAP", Impl: b.Swap(&stack)})
dict.AddWord("OVER", Word{Name: "OVER", Impl: b.Over(&stack)})
dict.AddWord("DROP", Word{Name: "DROP", Impl: b.Drop(&stack)})
dict.AddWord("ROT", Word{Name: "ROT", Impl: b.Rot(&stack)})
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dict.AddWord("PICK", Word{Name: "PICK", Impl: b.Pick(&stack)})
dict.AddWord("NIP", Word{Name: "NIP", Source: []string{"SWAP", "DROP"}})
dict.AddWord("TUCK", Word{Name: "TUCK", Source: []string{"SWAP", "OVER"}})
// paired stack manipulation
dict.AddWord("2DROP", Word{Name: "2DROP", Source: []string{"DROP", "DROP"}})
dict.AddWord("2DUP", Word{Name: "2DUP", Source: []string{"OVER", "OVER"}})
dict.AddWord("2OVER", Word{Name: "2OVER", Source: []string{"3", "PICK", "3", "PICK"}})
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// debugging
dict.AddWord("WORDS", Word{Name: "WORDS", Impl: b.Words(os.Stdout, dict)})
dict.AddWord("SEE", Word{Name: "SEE", Impl: b.See(os.Stdout, &rstack, dict)})
dict.AddWord("FLAGS", Word{Name: "FLAGS", Impl: b.Flags(os.Stdout, c)})
dict.AddWord(".S", Word{Name: ".S", Impl: b.Debug(os.Stdout, &stack)})
dict.AddWord(".R", Word{Name: ".R", Impl: b.Debug(os.Stdout, &rstack)})
dict.AddWord(".I", Word{Name: ".I", Impl: b.Debug(os.Stdout, &ifstack)})
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dict.AddWord("DEPTH", Word{Name: "DEPTH", Impl: b.Depth(&stack)})
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dict.AddWord("R>", Word{Name: "R>", Impl: b.RFrom(&stack, &rstack)})
dict.AddWord(">R", Word{Name: ">R", Impl: b.ToR(&stack, &rstack)})
dict.AddWord("R@", Word{Name: "R@", Impl: b.RFetch(&stack, &rstack)})
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// branching
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dict.AddWord("IF", Word{Name: "IF", Impl: b.If(&stack, &ifstack), BranchCheck: true})
dict.AddWord("ELSE", Word{Name: "ELSE", Impl: b.Else(&ifstack), BranchCheck: true})
dict.AddWord("THEN", Word{Name: "THEN", Impl: b.Then(&ifstack), BranchCheck: true})
dict.AddWord("DO", Word{Name: "DO", Impl: b.Do(&stack, &rstack)})
dict.AddWord("LOOP", Word{Name: "LOOP", Impl: b.Loop(&stack, &rstack)})
dict.AddWord("I", Word{Name: "I", Impl: b.I(&stack, &rstack)})
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// exit
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dict.AddWord("BYE", Word{Name: "BYE", Impl: b.Quit()})
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reader := bufio.NewReader(os.Stdin)
fmt.Print("prosper\n")
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// read loop
for {
if c.Flags["Immediate"] {
fmt.Print("> ")
} else {
fmt.Print(" ")
}
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line, err := reader.ReadString('\n')
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
line = strings.TrimSpace(line)
err = c.Eval(line + " ") // append a space to make sure we always close out our parse loop
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if errors.Is(err, ErrExit) {
fmt.Printf("bye\n")
os.Exit(0)
} else if err != nil {
fmt.Printf("error in evaluation: %v\n", err)
} else if c.Flags["Immediate"] {
fmt.Print("ok\n")
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}
}
}