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package main
import (
"os"
"bufio"
"main/walk"
)
type Program []Command
type ProgramState struct {
path, value, xreg []walk.Atom
in chan walk.WalkItem
out chan walk.WalkItem
program []Command
}
func main() {
quiet := false
var input string
hasInput := false
for i := 1; i < len(os.Args); i += 1 {
switch os.Args[i] {
case "-n":
quiet = true
continue
}
if i < len(os.Args) - 1 {
panic("Unexpected arguments after program")
}
input = os.Args[i]
hasInput = true
}
if !hasInput {
panic("Missing program")
}
tokens := Lex(input)
program := Parse(tokens)
stdin := bufio.NewReader(os.Stdin)
dataStream := walk.Json(stdin)
state := ProgramState {
in: dataStream,
out: make(chan walk.WalkItem),
program: program,
}
go func () {
for walkItem := range dataStream {
state.value = walk.Atomise([]walk.WalkValue{walkItem.Value})
state.path = walk.Atomise(walkItem.Path.ToWalkValues())
for _, cmd := range state.program {
cmd.exec(&state)
}
if !quiet {
pathValues, err := walk.Compound(state.path)
if err != nil {
panic("Tried to convert invalid atoms to values")
}
path := walk.PathFromWalkValues(pathValues)
values, err := walk.Compound(state.value)
if err != nil {
panic("Tried to convert invalid atoms to values")
}
for _, value := range values {
state.out <- walk.WalkItem {
Value: value,
Path: path,
}
}
}
}
close(state.out)
}()
walk.JsonOut(state.out)
}
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