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Add basic flag parsing support

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This commit is contained in:
Ske 2020-02-06 17:47:37 +01:00
parent 2148e29f54
commit 7a1aaf6dbd
2 changed files with 109 additions and 25 deletions
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13
PluralKit.Bot/CommandSystem/Context.cs
View File

@ -1,4 +1,5 @@
using System;
using System.Linq;
using System.Threading.Tasks;
using App.Metrics;
@ -61,9 +62,10 @@ namespace PluralKit.Bot
/// </summary>
public bool Match(ref string used, params string[] potentialMatches)
{
var arg = PeekArgument();
foreach (var match in potentialMatches)
{
if (PeekArgument().Equals(match, StringComparison.InvariantCultureIgnoreCase))
if (arg.Equals(match, StringComparison.InvariantCultureIgnoreCase))
{
used = PopArgument();
return true;
@ -82,6 +84,15 @@ namespace PluralKit.Bot
return Match(ref used, potentialMatches);
}
public bool MatchFlag(params string[] potentialMatches)
{
// Flags are *ALWAYS PARSED LOWERCASE*. This means we skip out on a "ToLower" call here.
// Can assume the caller array only contains lowercase *and* the set below only contains lowercase
var flags = _parameters.Flags();
return potentialMatches.Any(potentialMatch => flags.Contains(potentialMatch));
}
public async Task Execute<T>(Command commandDef, Func<T, Task> handler)
{
_currentCommand = commandDef;

119
PluralKit.Bot/CommandSystem/Parameters.cs
View File

@ -12,6 +12,29 @@ namespace PluralKit.Bot
private readonly string _cmd;
private int _ptr;
private ISet<string> _flags = null; // Only parsed when requested first time
private struct WordPosition
{
// Start of the word
internal int startPos;
// End of the word
internal int endPos;
// How much to advance word pointer afterwards to point at the start of the *next* word
internal int advanceAfterWord;
internal bool wasQuoted;
public WordPosition(int startPos, int endPos, int advanceAfterWord, bool wasQuoted)
{
this.startPos = startPos;
this.endPos = endPos;
this.advanceAfterWord = advanceAfterWord;
this.wasQuoted = wasQuoted;
}
}
public Parameters(string cmd)
{
@ -21,42 +44,89 @@ namespace PluralKit.Bot
_ptr = 0;
}
private void ParseFlags()
{
_flags = new HashSet<string>();
var ptr = 0;
while (NextWordPosition(ptr) is { } wp)
{
ptr = wp.endPos + wp.advanceAfterWord;
// Is this word a *flag* (as in, starts with a - AND is not quoted)
if (_cmd[wp.startPos] != '-' || wp.wasQuoted) continue; // (if not, carry on w/ next word)
// Find the *end* of the flag start (technically allowing arbitrary amounts of dashes)
var flagNameStart = wp.startPos;
while (flagNameStart < _cmd.Length && _cmd[flagNameStart] == '-')
flagNameStart++;
// Then add the word to the flag set
var word = _cmd.Substring(flagNameStart, wp.endPos - flagNameStart).Trim();
if (word.Length > 0)
_flags.Add(word.ToLowerInvariant());
}
}
public string Pop()
{
var positions = NextWordPosition();
if (positions == null) return "";
// Loop to ignore and skip past flags
while (NextWordPosition(_ptr) is { } pos)
{
_ptr = pos.endPos + pos.advanceAfterWord;
if (_cmd[pos.startPos] == '-' && !pos.wasQuoted) continue;
return _cmd.Substring(pos.startPos, pos.endPos - pos.startPos).Trim();
}
var (start, end, advance) = positions.Value;
_ptr = end + advance;
return _cmd.Substring(start, end - start).Trim();
return "";
}
public string Peek()
{
var positions = NextWordPosition();
if (positions == null) return "";
// Loop to ignore and skip past flags, temp ptr so we don't move the real ptr
var ptr = _ptr;
while (NextWordPosition(ptr) is { } pos)
{
ptr = pos.endPos + pos.advanceAfterWord;
if (_cmd[pos.startPos] == '-' && !pos.wasQuoted) continue;
return _cmd.Substring(pos.startPos, pos.endPos - pos.startPos).Trim();
}
var (start, end, _) = positions.Value;
return _cmd.Substring(start, end - start).Trim();
return "";
}
public ISet<string> Flags()
{
if (_flags == null) ParseFlags();
return _flags;
}
public string Remainder()
{
// Skip all *leading* flags when taking the remainder
while (NextWordPosition(_ptr) is {} wp)
{
if (_cmd[wp.startPos] != '-' || wp.wasQuoted) break;
_ptr = wp.endPos + wp.advanceAfterWord;
}
// *Then* get the remainder
return _cmd.Substring(Math.Min(_ptr, _cmd.Length)).Trim();
}
public string Remainder() => _cmd.Substring(Math.Min(_ptr, _cmd.Length)).Trim();
public string FullCommand => _cmd;
// Returns tuple of (startpos, endpos, advanceafter)
// advanceafter is how much to move the pointer afterwards to point it
// at the start of the next word
private ValueTuple<int, int, int>? NextWordPosition()
private WordPosition? NextWordPosition(int position)
{
// Is this the end of the string?
if (_cmd.Length <= _ptr) return null;
if (_cmd.Length <= position) return null;
// Is this a quoted word?
if (_quotePairs.ContainsKey(_cmd[_ptr]))
if (_quotePairs.ContainsKey(_cmd[position]))
{
// This is a quoted word, find corresponding end quote and return span
var endQuote = _quotePairs[_cmd[_ptr]];
var endQuotePosition = _cmd.IndexOf(endQuote, _ptr + 1);
var endQuote = _quotePairs[_cmd[position]];
var endQuotePosition = _cmd.IndexOf(endQuote, position + 1);
// Position after the end quote should be a space (or EOL)
// Otherwise treat it as a standard word that's not quoted
@ -66,16 +136,19 @@ namespace PluralKit.Bot
{
// This is an unterminated quoted word, just return the entire word including the start quote
// TODO: should we do something else here?
return (_ptr, _cmd.Length, 0);
return new WordPosition(position, _cmd.Length, 0, false);
}
return (_ptr + 1, endQuotePosition, 2);
return new WordPosition(position + 1, endQuotePosition, 2, true);
}
}
// Not a quoted word, just find the next space and return as appropriate
var wordEnd = _cmd.IndexOf(' ', _ptr + 1);
return wordEnd != -1 ? (_ptr, wordEnd, 1) : (_ptr, _cmd.Length, 0);
// Not a quoted word, just find the next space and return if it's the end of the command
var wordEnd = _cmd.IndexOf(' ', position + 1);
return wordEnd == -1
? new WordPosition(position, _cmd.Length, 0, false)
: new WordPosition(position, wordEnd, 1, false);
}
}
}