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//! A command is the parsed representation of what the user types
//! in the input. It's independant of the state of the application
//! (verbs arent checked at this point)
use regex::Regex;
use termion::event::Key;
#[derive(Debug, Clone)]
pub struct Command {
pub raw: String, // what's visible in the input
parts: CommandParts, // the parsed parts of the visible input
pub action: Action, // what's required, based on the last key (which may be not visible, like esc)
}
/// An intermediate parsed representation of the raw string
#[derive(Debug, Clone)]
struct CommandParts {
pattern: Option<String>, // either a fuzzy pattern or the core of a regex
regex_flags: Option<String>, // may be Some("") if user asked for a regex but specified no flag
verb: Option<String>, // may be Some("") if user already typed the separator
}
#[derive(Debug, Clone)]
pub enum Action {
MoveSelection(i32), // up (neg) or down (positive) in the list
ScrollPage(i32), // in number of pages, not lines
OpenSelection, // open the selected line
AltOpenSelection, // alternate open the selected line
VerbEdit(String), // verb, unfinished
Verb(String), // verb, after the user hit enter
FuzzyPatternEdit(String), // a pattern being edited
RegexEdit(String, String), // a regex being edited (core & flags)
Back, // back to last app state, or clear pattern
Next, // goes to the next matching entry
Help, // goes to help state
Unparsed, // or unparsable
}
impl CommandParts {
fn new() -> CommandParts {
CommandParts {
pattern: None,
regex_flags: None,
verb: None,
}
}
fn from(raw: &str) -> CommandParts {
let mut cp = CommandParts::new();
lazy_static! {
static ref RE: Regex = Regex::new(
r"(?x)
^
(?P<slash_before>/)?
(?P<pattern>[^\s/:]+)?
(?:/(?P<regex_flags>\w*))?
(?:[\s:]+(?P<verb>\S*))?
$
"
)
.unwrap();
}
if let Some(c) = RE.captures(raw) {
if let Some(pattern) = c.name("pattern") {
cp.pattern = Some(String::from(pattern.as_str()));
if let Some(rxf) = c.name("regex_flags") {
cp.regex_flags = Some(String::from(rxf.as_str()));
} else if c.name("slash_before").is_some() {
cp.regex_flags = Some("".into());
}
}
if let Some(verb) = c.name("verb") {
cp.verb = Some(String::from(verb.as_str()));
}
}
cp
}
}
impl Action {
fn from(cp: &CommandParts, finished: bool) -> Action {
if let Some(verb) = &cp.verb {
let verb = String::from(verb.as_str());
if finished {
Action::Verb(verb)
} else {
Action::VerbEdit(verb)
}
} else if finished {
Action::OpenSelection
} else if let Some(pattern) = &cp.pattern {
let pattern = String::from(pattern.as_str());
if let Some(regex_flags) = &cp.regex_flags {
Action::RegexEdit(pattern, String::from(regex_flags.as_str()))
} else {
Action::FuzzyPatternEdit(String::from(pattern.as_str()))
}
} else {
Action::FuzzyPatternEdit(String::from(""))
}
}
}
impl Command {
pub fn new() -> Command {
Command {
raw: String::new(),
parts: CommandParts::new(),
action: Action::Unparsed,
}
}
// build a new command, after execution of a verb
// (in the future the new action might be built by the state
// which would be cleaner)
pub fn pop_verb(&self) -> Command {
let mut c = Command::new();
if self.parts.verb.is_some() {
if let Some(pat) = &self.parts.pattern {
c.raw = pat.to_owned();
if let Some(regex_flags) = &self.parts.regex_flags {
// we prefer the slash as postfix only because it
// makes it easier to switch between regex
// and fuzzy pattern
c.raw.push('/');
c.raw.push_str(regex_flags.as_str());
}
}
}
c
}
// build a command from a string
// Note that this isn't used (or usable) for interpretation
// of the in-app user input. It's meant for interpretation
// of a file or from a sequence of commands passed as argument
// of the program.
// A ':', even if at the end, is assumed to mean that the
// command must be executed (it's equivalent to the user
// typing `enter` in the app
// This specific syntax isn't definitive
pub fn from(raw: String) -> Command {
let parts = CommandParts::from(&raw);
let action = Action::from(&parts, raw.contains(':'));
Command { raw, parts, action }
}
pub fn add_key(&mut self, key: Key) {
match key {
Key::Char('\t') => {
self.action = Action::Next;
}
Key::Char('\n') => {
self.action = Action::from(&self.parts, true);
}
Key::Alt('\r') | Key::Alt('\n') => {
self.action = Action::AltOpenSelection;
}
Key::Up => {
self.action = Action::MoveSelection(-1);
}
Key::Down => {
self.action = Action::MoveSelection(1);
}
Key::PageUp => {
self.action = Action::ScrollPage(-1);
}
Key::PageDown => {
self.action = Action::ScrollPage(1);
}
Key::Char(c) => {
if c == '?' && self.raw.is_empty() {
// as first character, a '?' is a request for help
self.action = Action::Help;
} else {
self.raw.push(c);
self.parts = CommandParts::from(&self.raw);
self.action = Action::from(&self.parts, false);
}
}
Key::Esc => {
self.action = Action::Back;
}
Key::Backspace => {
if self.raw == "" {
self.action = Action::Back;
} else {
self.raw.pop();
self.parts = CommandParts::from(&self.raw);
self.action = Action::from(&self.parts, false);
}
}
_ => {}
}
}
}
|
