1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
package main
// #cgo darwin CFLAGS: -I/usr/local/opt/readline/include
// #cgo darwin LDFLAGS: -L/usr/local/opt/readline/lib
// #cgo LDFLAGS: -lreadline
// #include <stdio.h>
// #include <stdlib.h>
// #include <readline/readline.h>
// #include <readline/history.h>
import "C"
import (
"os"
"os/signal"
"strings"
"syscall"
"unsafe"
)
func initReadLine() {
C.rl_catch_sigwinch = 0
C.rl_catch_signals = 0
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGWINCH)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
switch sig {
case syscall.SIGWINCH:
C.rl_resize_terminal()
case os.Interrupt:
C.rl_cleanup_after_signal()
default:
}
}
}()
}
func readLine(prompt *string) *string {
var p *C.char
//readline allows an empty prompt(NULL)
if prompt != nil {
p = C.CString(*prompt)
}
ret := C.readline(p)
if p != nil {
C.free(unsafe.Pointer(p))
}
if ret == nil {
return nil
} //EOF
s := C.GoString(ret)
C.free(unsafe.Pointer(ret))
return &s
}
func addHistory(s string) {
p := C.CString(s)
C.add_history(p)
C.free(unsafe.Pointer(p))
}
var indentCount = 0
var str = ""
func (self *JSRepl) setIndent() {
open := strings.Count(str, "{")
open += strings.Count(str, "(")
closed := strings.Count(str, "}")
closed += strings.Count(str, ")")
indentCount = open - closed
if indentCount <= 0 {
self.prompt = "> "
} else {
self.prompt = strings.Join(make([]string, indentCount*2), "..")
self.prompt += " "
}
}
func (self *JSRepl) read() {
initReadLine()
L:
for {
switch result := readLine(&self.prompt); true {
case result == nil:
break L
case *result != "":
str += *result + "\n"
self.setIndent()
if indentCount <= 0 {
if *result == "exit" {
self.Stop()
break L
}
addHistory(str[:len(str)-1]) //allow user to recall this line
self.parseInput(str)
str = ""
}
}
}
}
func (self *JSRepl) PrintValue(v interface{}) {
method, _ := self.re.vm.Get("prettyPrint")
v, err := self.re.vm.ToValue(v)
if err == nil {
method.Call(method, v)
}
}
|
