zongor
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varaq-interpreter-go
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add initial servehttp

This commit is contained in:
zongor 2023-03-18 22:26:32 -04:00
parent ec4f3c8341
commit 98617309c4
6 changed files with 92 additions and 89 deletions
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4
.vscode/launch.json vendored Executable file → Normal file
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@ -10,7 +10,7 @@
"request": "launch",
"mode": "auto",
"program": "main.go",
"args": ["examples/test.vqe"]
},
"args": ["examples/http_hello_world.vqe"]
}
]
}

8
examples/http_hello_world.vqe Normal file
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@ -0,0 +1,8 @@
{
"<!DOCTYPE html>" disp newline
"<html>" disp newline
"<body>" disp newline
"<h1>nuqneH 'u'?</h1>" disp newline
"</body>" disp newline
"</html>" disp
} ":3333" servehttp

5
main.go Executable file → Normal file
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@ -20,8 +20,8 @@ func main() {
func repl() {
scanner := bufio.NewScanner(os.Stdin)
fmt.Print("> ")
for scanner.Scan() {
fmt.Print("> ")
line := scanner.Text()
if len(line) == 0 {
return
@ -30,7 +30,6 @@ func repl() {
if err != nil {
fmt.Printf("%v\n", err)
}
fmt.Print("> ")
}
}
@ -55,7 +54,7 @@ func interpret(src string) error {
}
code := varaq.Parse(tokens)
err = varaq.Interpret(code, os.Args[1:])
err = varaq.Interpret(code, os.Args[1:], os.Stdout)
if err != nil {
fmt.Printf("%v\n", err)
return err

119
varaq/interpreter.go Executable file → Normal file
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@ -3,9 +3,11 @@ package varaq
import (
"bufio"
"fmt"
"io"
"math"
"math/rand"
"net"
"net/http"
"os"
"strconv"
"strings"
@ -46,14 +48,14 @@ func pop() (Expr, error) {
return res, nil
}
func identifierToObj(c Expr, idx int, argv []string) error {
func identifierToObj(c Expr, idx int, argv []string, w io.Writer) error {
k, k_ok := c.Value.(string)
if k_ok {
o := get(k)
if o.Tok == UNDEFINED {
return fmt.Errorf("identifier %s undefined @%v", k, idx)
} else if o.Tok == FUNCTION {
e := Interpret(o, argv)
e := Interpret(o, argv, w)
if e != nil {
if e == fmt.Errorf("escape") {
return nil
@ -70,8 +72,8 @@ func identifierToObj(c Expr, idx int, argv []string) error {
return nil
}
func (c Expr) idToExpr(idx int, argv []string) (Expr, error) {
e := identifierToObj(c, idx, argv)
func (c Expr) idToExpr(idx int, argv []string, w io.Writer) (Expr, error) {
e := identifierToObj(c, idx, argv, w)
if e != nil {
return Expr{UNDEFINED, nil, nil, 0}, e
}
@ -84,8 +86,8 @@ func (c Expr) idToExpr(idx int, argv []string) (Expr, error) {
return vv, nil
}
func (c Expr) idToS(idx int, argv []string) (string, error) {
v, e := c.idToExpr(idx, argv)
func (c Expr) idToS(idx int, argv []string, w io.Writer) (string, error) {
v, e := c.idToExpr(idx, argv, w)
if e != nil {
return "", e
}
@ -93,13 +95,13 @@ func (c Expr) idToS(idx int, argv []string) (string, error) {
return fmt.Sprintf("%b", v.Value), nil
}
func popArgs(idx int, argv []string) (Expr, Expr, error) {
func popArgs(idx int, argv []string, w io.Writer) (Expr, Expr, error) {
b, e := pop()
if e != nil {
return Expr{UNDEFINED, nil, nil, 0}, Expr{UNDEFINED, nil, nil, 0}, e
}
if b.Tok == IDENTIFIER {
b, e = b.idToExpr(idx, argv)
b, e = b.idToExpr(idx, argv, w)
if e != nil {
return Expr{UNDEFINED, nil, nil, 0}, Expr{UNDEFINED, nil, nil, 0}, e
}
@ -109,7 +111,7 @@ func popArgs(idx int, argv []string) (Expr, Expr, error) {
return Expr{UNDEFINED, nil, nil, 0}, Expr{UNDEFINED, nil, nil, 0}, e
}
if a.Tok == IDENTIFIER {
a, e = a.idToExpr(idx, argv)
a, e = a.idToExpr(idx, argv, w)
if e != nil {
return Expr{UNDEFINED, nil, nil, 0}, Expr{UNDEFINED, nil, nil, 0}, e
}
@ -118,7 +120,7 @@ func popArgs(idx int, argv []string) (Expr, Expr, error) {
return a, b, nil
}
func Interpret(code Expr, argv []string) error {
func Interpret(code Expr, argv []string, w io.Writer) error {
for idx, c := range code.Exprs {
switch c.Tok {
case NUMBER:
@ -170,33 +172,6 @@ func Interpret(code Expr, argv []string) error {
push(stack[n-2])
stack = append(stack[:n-2], stack[n-3:]...)
case PICK:
n := len(stack) - 1
a, e := pop()
if e != nil {
return e
}
if a.Tok == IDENTIFIER {
a = get(a.Value.(string))
}
if a.Tok == NUMBER {
idx := int(a.Value.(float64))
if idx <= 0 {
return fmt.Errorf("`pick`: index must be a positive nonzero value")
}
if n-idx < 0 {
return fmt.Errorf("`pick`: stack underflow")
}
if idx > n {
return fmt.Errorf("`pick`: stack overflow")
}
push(stack[n-idx])
} else {
return fmt.Errorf("cannot `pick` index is not a number @%v", idx)
}
case DEPTH:
push(Expr{NUMBER, nil, float64(len(stack)), 0})
case CLEAR:
@ -206,7 +181,7 @@ func Interpret(code Expr, argv []string) error {
if idx-1 >= 0 && code.Exprs[idx-1].Tok == TILDE {
push(c)
} else {
e := identifierToObj(c, idx, argv)
e := identifierToObj(c, idx, argv, w)
if e != nil {
return e
}
@ -229,9 +204,9 @@ func Interpret(code Expr, argv []string) error {
}
case DUMP:
for n := len(stack) - 1; n >= 0; n-- {
fmt.Println(stack[n])
fmt.Fprintf(w, "%v\n", stack[n])
}
fmt.Println("=== end of dump ===")
fmt.Fprintf(w, "=== end of dump ===\n")
case NAME:
fun, e := pop()
if e != nil {
@ -273,7 +248,7 @@ func Interpret(code Expr, argv []string) error {
}
if fun.Tok == FUNCTION && logical.Tok == BOOLEAN {
if logical.Value.(bool) {
Interpret(fun, argv)
Interpret(fun, argv, w)
}
} else {
return fmt.Errorf("cannot `ifyes` not a function or bool @%v", idx)
@ -289,7 +264,7 @@ func Interpret(code Expr, argv []string) error {
}
if fun.Tok == FUNCTION && logical.Tok == BOOLEAN {
if !logical.Value.(bool) {
Interpret(fun, argv)
Interpret(fun, argv, w)
}
} else {
return fmt.Errorf("cannot `ifno` not a function or bool @%v", idx)
@ -311,7 +286,7 @@ func Interpret(code Expr, argv []string) error {
return e
}
if fun.Tok == FUNCTION {
Interpret(fun, argv)
Interpret(fun, argv, w)
} else {
return fmt.Errorf("cannot `eval` not a function @%v", idx)
}
@ -328,7 +303,7 @@ func Interpret(code Expr, argv []string) error {
}
if fun.Tok == FUNCTION && count.Tok == NUMBER {
for n := int64(0); n < int64(count.Value.(float64)); n++ {
err := Interpret(fun, argv)
err := Interpret(fun, argv, w)
if err != nil {
return err
}
@ -436,7 +411,7 @@ func Interpret(code Expr, argv []string) error {
var v2_s string
if v1.Tok == IDENTIFIER {
v1_s, e = v1.idToS(idx, argv)
v1_s, e = v1.idToS(idx, argv, w)
if e != nil {
return e
}
@ -462,7 +437,7 @@ func Interpret(code Expr, argv []string) error {
}
if v2.Tok == IDENTIFIER {
v2_s, e = v2.idToS(idx, argv)
v2_s, e = v2.idToS(idx, argv, w)
if e != nil {
return e
}
@ -530,7 +505,7 @@ func Interpret(code Expr, argv []string) error {
}
}
case ADD:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -541,7 +516,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `add` values are not numbers @%v", idx)
}
case SUB:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -552,7 +527,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `sub` values are not numbers @%v", idx)
}
case MUL:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -563,7 +538,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `mul` values are not numbers @%v", idx)
}
case DIV:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -574,7 +549,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `div` values are not numbers @%v", idx)
}
case IDIV:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -585,7 +560,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `idiv` values are not numbers @%v", idx)
}
case MOD:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -596,7 +571,7 @@ func Interpret(code Expr, argv []string) error {
return fmt.Errorf("cannot `mod` values are not numbers @%v", idx)
}
case POW:
a, b, e := popArgs(idx, argv)
a, b, e := popArgs(idx, argv, w)
if e != nil {
return e
}
@ -1215,15 +1190,15 @@ func Interpret(code Expr, argv []string) error {
return e
}
if a.Tok == IDENTIFIER {
fmt.Printf("%v\n", get(a.Value.(string)))
fmt.Fprintf(w, "%v", get(a.Value.(string)))
} else if a.Tok == NUMBER {
if a.Value.(float64) == float64(int64(a.Value.(float64))) {
fmt.Printf("%d\n", int64(a.Value.(float64)))
fmt.Fprintf(w, "%d", int64(a.Value.(float64)))
} else {
fmt.Printf("%f\n", a.Value.(float64))
fmt.Fprintf(w, "%f", a.Value.(float64))
}
} else {
fmt.Printf("%v\n", a.Value)
fmt.Fprintf(w, "%v", a.Value)
}
case LISTEN:
var str string
@ -1245,9 +1220,9 @@ func Interpret(code Expr, argv []string) error {
}
fmt.Fprintf(os.Stderr, "%v", a.Value)
case NEWLINE:
fmt.Println()
fmt.Fprintf(w, "\n")
case TAB:
fmt.Println("\t")
fmt.Fprintf(w, "\t")
case WHEREAMI:
conn, e := net.Dial("udp", "8.8.8.8:80")
if e != nil {
@ -1257,9 +1232,31 @@ func Interpret(code Expr, argv []string) error {
localAddr := conn.LocalAddr().(*net.UDPAddr)
fmt.Println(localAddr.IP.String())
fmt.Fprintf(w, "%s\n", localAddr.IP.String())
case SERVEHTTP:
str, e := pop()
if e != nil {
return e
}
if str.Tok != STRING {
return fmt.Errorf("cannot `servehttp` exptected a string for the port @%v", idx)
}
http.ListenAndServe(str.Value.(string), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fun, e := pop()
if e != nil {
return
}
if fun.Tok == FUNCTION {
Interpret(fun, nil, w)
} else {
return
}
}))
case VERSION:
fmt.Println("var'aq -- 0.9.1 Martoq")
fmt.Fprintf(w, "var'aq -- 0.9.1 Martoq")
case ARGV:
arg := Expr{LIST, make([]Expr, 0), nil, 0}
for _, v := range argv {

3
varaq/scanner.go Executable file → Normal file
View File

@ -181,8 +181,7 @@ var keywords = map[string]TokenType{
"QI": OVER,
"depth": DEPTH,
"juv": DEPTH,
"pick": PICK,
"woH": PICK,
"servehttp": SERVEHTTP,
}
func isDigit(s string) bool {

4
varaq/token.go Executable file → Normal file
View File

@ -105,7 +105,7 @@ const (
OVER
ROT
DEPTH
PICK
SERVEHTTP
)
var tokens = [...]string{
@ -210,7 +210,7 @@ var tokens = [...]string{
OVER: "OVER",
ROT: "ROT",
DEPTH: "DEPTH",
PICK: "PICK",
SERVEHTTP: "SERVEHTTP",
}
func (me TokenType) String() string {