tenebrous-dicebot/src/commands/parser.rs

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/**
* In addition to the terms of the AGPL, portions of this file are
* governed by the terms of the MIT license, from the original
* axfive-matrix-dicebot project.
*/
use crate::commands::{
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basic_rolling::RollCommand,
cofd::PoolRollCommand,
cthulhu::{CthAdvanceRoll, CthRoll},
management::{CheckCommand, LinkCommand, RegisterCommand, UnlinkCommand, UnregisterCommand},
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misc::HelpCommand,
variables::{
DeleteVariableCommand, GetAllVariablesCommand, GetVariableCommand, SetVariableCommand,
},
Command,
};
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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use crate::error::BotError;
use combine::parser::char::{char, letter, space};
use combine::{any, many1, optional, Parser};
use std::convert::TryFrom;
use thiserror::Error;
#[derive(Debug, Clone, PartialEq, Error)]
pub enum CommandParsingError {
#[error("unrecognized command: {0}")]
UnrecognizedCommand(String),
#[error("parser error: {0}")]
InternalParseError(#[from] combine::error::StringStreamError),
}
/// Split an input string into its constituent command and "everything
/// else" parts. Extracts the command separately from its input (i.e.
/// rest of the line) and returns a tuple of (command_input, command).
/// Whitespace at the start and end of the command input is removed.
fn split_command(input: &str) -> Result<(String, String), CommandParsingError> {
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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let input = input.trim();
let exclamation = char('!');
let word = many1(letter()).map(|value: String| value);
let at_least_one_space = many1(space().silent()).map(|value: String| value);
let cmd_input = optional(at_least_one_space.and(many1(any()).map(|value: String| value)));
let mut parser = exclamation.and(word).and(cmd_input);
//TODO make less wacky, possibly by mapping it into a struct and
// making use of skip. This super-wacky tuple is:
// (parsed_input, rest)
//Where parsed_input is:
// (!command, option<arguments>)
//Where !command is:
// ('!', command)
//Were option<arguments> is:
// Option tuple of (whitespace, arguments)
let (command, command_input) = match parser.parse(input)? {
(((_, command), Some((_, command_input))), _) => (command, command_input),
(((_, command), None), _) => (command, "".to_string()),
};
Ok((command, command_input))
}
/// Atempt to convert text input to a Boxed command type. Shortens
/// boilerplate.
macro_rules! convert_to {
($type:ident, $input: expr) => {
$type::try_from($input.as_str()).map(Into::into)
};
}
/// Potentially parse a command expression. If we recognize the
/// command, an error should be raised if the command is misparsed. If
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/// we don't recognize the command, return an error.
pub fn parse_command(input: &str) -> Result<Box<dyn Command>, BotError> {
match split_command(input) {
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Ok((cmd, cmd_input)) => match cmd.to_lowercase().as_ref() {
// "variables" => GetAllVariablesCommand::try_from(input).map(Into::into),
"variables" => convert_to!(GetAllVariablesCommand, cmd_input),
"get" => convert_to!(GetVariableCommand, cmd_input),
"set" => convert_to!(SetVariableCommand, cmd_input),
"del" => convert_to!(DeleteVariableCommand, cmd_input),
"r" | "roll" => convert_to!(RollCommand, cmd_input),
"rp" | "pool" => convert_to!(PoolRollCommand, cmd_input),
"chance" => PoolRollCommand::chance_die().map(Into::into),
"cthroll" => convert_to!(CthRoll, cmd_input),
"cthadv" | "ctharoll" => convert_to!(CthAdvanceRoll, cmd_input),
"help" => convert_to!(HelpCommand, cmd_input),
"register" => convert_to!(RegisterCommand, cmd_input),
"link" => convert_to!(LinkCommand, cmd_input),
"unlink" => convert_to!(UnlinkCommand, cmd_input),
"check" => convert_to!(CheckCommand, cmd_input),
"unregister" => convert_to!(UnregisterCommand, cmd_input),
_ => Err(CommandParsingError::UnrecognizedCommand(cmd).into()),
},
//All other errors passed up.
Err(e) => Err(e.into()),
}
}
#[cfg(test)]
mod tests {
use super::*;
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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//TODO these errors don't seem to implement the right traits to do
//eq checks or even unwrap_err!
#[test]
fn non_command_test() {
let result = parse_command("not a command");
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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assert!(result.is_err());
}
#[test]
fn empty_message_test() {
let result = parse_command("");
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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assert!(result.is_err());
}
#[test]
fn just_exclamation_mark_test() {
let result = parse_command("!");
assert!(result.is_err());
}
#[test]
fn newline_test() {
assert!(parse_command("\n!roll 1d4").is_ok());
}
#[test]
fn whitespace_and_newline_test() {
assert!(parse_command(" \n!roll 1d4").is_ok());
}
#[test]
fn newline_and_whitespace_test() {
assert!(parse_command("\n !cthroll 50").is_ok());
}
#[test]
fn word_with_exclamation_mark_test() {
let result1 = parse_command("hello !notacommand");
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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assert!(result1.is_err());
let result2 = parse_command("hello!");
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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assert!(result2.is_err());
let result3 = parse_command("hello!notacommand");
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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assert!(result3.is_err());
}
#[test]
fn basic_command_test() {
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("roll".to_string(), "1d4".to_string()),
split_command("!roll 1d4").expect("got parsing error")
);
}
#[test]
fn whitespace_at_start_test() {
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("roll".to_string(), "1d4".to_string()),
split_command(" !roll 1d4").expect("got parsing error")
);
}
#[test]
fn whitespace_at_end_test() {
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("roll".to_string(), "1d4".to_string()),
split_command("!roll 1d4 ").expect("got parsing error")
);
}
#[test]
fn whitespace_on_both_ends_test() {
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("roll".to_string(), "1d4".to_string()),
split_command(" !roll 1d4 ").expect("got parsing error")
);
}
#[test]
fn single_command_test() {
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("roll".to_string(), "".to_string()),
split_command("!roll").expect("got parsing error")
);
assert_eq!(
Dice pool and command parser rewrite to prepare for user variables. This commit refactors the parsing and rolling for the dice pool system to prepare for support of user variables. The nom parser was dropped in favor of the easier-to-understand combine parser in most parts of the code. A breaking change was introduced into the dice pool syntax to allow for proper expressions and variables. The syntax is now "modifiers:pool-amount", e.g. "n:gnosis+8". The simple single-number syntax with no modifiers is also still understood. Dice pool expressions are translated into a Vec of "Amount" objects, stored by the DicePool struct. They have an operator (+ or -) and either a number or variable name. When the dice pool is rolled, this list of Amonuts are is collapsed into a single number that is rolled, as it was before the refactor. The following changes were made to the dice rolling code: - Store Vec<Amount> on DicePool instead of single number to roll. - New struct RolledDicePool to store result of a dice pool roll. - Remove Display trait from DicePool, move it over to RolledDicePool. - Separate extra dice pool info into DicePoolModifiers. - DicePoolModifiers is shared between DicePool and RolledDicePool. - Dice parsing and rolling now return standard Result objects. This commit does NOT enable support of actually using variables. Any dice pool roll containing a variable will result in an eror. The command parser was also rewritten to use combine and rely on the standard Result pattern.
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("thisdoesnotexist".to_string(), "".to_string()),
split_command("!thisdoesnotexist").expect("got parsing error")
);
}
#[test]
fn bad_command_test() {
assert!(split_command("roll 1d4").is_err());
assert!(split_command("roll").is_err());
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}
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#[test]
fn chance_die_is_not_malformed() {
assert!(parse_command("!chance").is_ok());
}
#[test]
fn roll_malformed_expression_test() {
assert!(parse_command("!roll 1d20asdlfkj").is_err());
assert!(parse_command("!roll 1d20asdlfkj ").is_err());
}
#[test]
fn roll_dice_pool_malformed_expression_test() {
assert!(parse_command("!pool 8abc").is_err());
assert!(parse_command("!pool 8abc ").is_err());
}
#[test]
fn pool_whitespace_test() {
parse_command("!pool ns3:8 ").expect("was error");
parse_command(" !pool ns3:8").expect("was error");
parse_command(" !pool ns3:8 ").expect("was error");
}
#[test]
fn help_whitespace_test() {
parse_command("!help stuff ").expect("was error");
parse_command(" !help stuff").expect("was error");
parse_command(" !help stuff ").expect("was error");
}
#[test]
fn roll_whitespace_test() {
parse_command("!roll 1d4 + 5d6 -3 ").expect("was error");
parse_command("!roll 1d4 + 5d6 -3 ").expect("was error");
parse_command(" !roll 1d4 + 5d6 -3 ").expect("was error");
}
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#[test]
fn case_insensitive_test() {
parse_command("!CTHROLL 40").expect("command parsing is not case sensitive.");
}
}