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package main
import (
"os"
"bufio"
"main/walk"
"main/json_tokens"
)
type Program []Command
type ProgramState struct {
path, value, xreg, yreg, zreg []walk.Atom
in walk.StredReader
out walk.StredWriter
program []Command
pc int
}
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)
stdout := bufio.NewWriter(os.Stdout)
state := ProgramState {
in: json_tokens.NewJSONIn(stdin),
out: json_tokens.NewJSONOut(stdout),
program: program,
}
for {
walkItem, err := state.in.Read()
if err != nil {
break
}
state.value = walkItem.Value
state.path = walkItem.Path
state.pc = 0
for state.pc < len(state.program) {
state.program[state.pc].exec(&state)
}
if !quiet {
err := state.out.Write(walk.WalkItem {
Path: state.path,
Value: state.value,
})
if err != nil {
panic("Error while outputting")
}
}
}
state.in.AssertDone()
state.out.AssertDone()
}
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