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use ::node_token::NodeToken;
#[derive(Clone)]
pub struct NodeRunner {
pub tokens: Vec<NodeToken>
}
impl NodeRunner {
pub fn new(command: &str) -> Result<NodeRunner, String> {
let mut tokens: Vec<NodeToken> = vec!();
let mut token_progress = NodeTokenProgress::ChainProperty;
let mut token_begin = 0;
let chars: Vec<char> = command.chars().collect();
for (i, c_ref) in chars.iter().enumerate() {
let c = *c_ref;
if c == '.' || c == ' ' || c == '[' {
tokens.push(match token_progress {
NodeTokenProgress::ChainProperty => {
let token_str = &command[token_begin..i];
if token_str.len() == 0 {
return Err (String::from("Missing property"));
}
NodeToken::ChainProperty (token_str.to_string())
}
NodeTokenProgress::ChainIndex => {
let token_str = &command[token_begin..i-1];
if token_str.len() == 0 {
return Err (String::from("Missing index"));
}
match command[token_begin..i-1].parse() {
Ok (index) => NodeToken::ChainIndex (index),
Err (_) => return Err (String::from("Not a valid index"))
}
}
NodeTokenProgress::ChainKey => {
let token_str = &command[token_begin..i-1];
if token_str.len() == 0 {
return Err (String::from("Missing index"));
}
NodeToken::ChainKey (token_str.to_string())
}
NodeTokenProgress::ChainContext => {
NodeToken::ChainContext
}
_ => { return Err(String::from("Whooops. This shouldnt happen.")) }
});
token_begin = i+1;
}
match c {
'.' => {
token_progress = NodeTokenProgress::ChainProperty;
}
' ' => {
token_progress = NodeTokenProgress::Action;
break;
}
'[' => {
if let Some(next_c) = chars.get(i+1) {
if next_c.is_digit(10) {
token_progress = NodeTokenProgress::ChainIndex;
}
else if next_c.is_alphabetic() {
token_progress = NodeTokenProgress::ChainKey;
}
else if *next_c == '?' {
token_progress = NodeTokenProgress::ChainContext;
}
else {
return Err (String::from("Not a valid key or index."));
}
}
else {
return Err (String::from("Unfinished key or index."));
}
}
_ => { }
}
}
if let NodeTokenProgress::Action = token_progress {
let mut action = command[token_begin..].split_whitespace();
tokens.push(match action.next() {
Some("get") => NodeToken::Get,
Some("set") => {
match action.next() {
Some(arg) => NodeToken::Set(arg.to_string()),
None => return Err (String::from("No argument given to set action"))
}
}
Some("copy") => NodeToken::CopyFrom,
Some("paste") => NodeToken::PasteTo,
Some(&_) => return Err (String::from("Action is invalid")),
None => return Err (String::from("This should be unreachable: No Action"))
});
}
else {
return Err (String::from("No action"));
}
tokens.reverse();
println!("{:?}", tokens);
Ok(NodeRunner {
tokens: tokens
})
}
pub fn step(&mut self) -> NodeToken {
self.tokens.pop().unwrap()
}
}
pub enum NodeTokenProgress {
ChainContext,
ChainProperty,
ChainIndex,
ChainKey,
Action
}