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|
//! The definition of the "kairos" syntax, for parsing user input into TimeType objects
//!
//! The syntax itself is described in the grammar.rustpeg file.
//! Here goes a documentation on the syntax
//!
//! # Syntax
//!
//! ## Units
//!
//! UnitSec = "second" | "seconds" | "sec" | "secs" | "s"
//! UnitMin = "minute" | "minutes" | "min" | "mins"
//! UnitHr = "hour" | "hours" | "hr" | "hrs"
//! UnitDay = "day" | "days" | "d"
//! UnitWeek = "week" | "weeks" | "w"
//! UnitMonth = "month" | "months" |
//! UnitYear = "year" | "years" | "yrs"
//! Unit = UnitSec | UnitMin | UnitHr | UnitDay | UnitWeek | UnitMonth | UnitYear
//!
//! ## Operators
//!
//! Operator = "+" | "-"
//!
//! ## Intermediate syntax nodes
//!
//! Amount = "<Number><Unit>"
//!
//! TextIterSpec = "secondly" | "minutely" | "hourly" | "daily" | "weekly" | "monthly" | "yearly"
//! Iterspec = TextIterSpec | "every" <Number><Unit>
//!
//! ## User-facing syntax nodes
//!
//! AmountExpr = <Amount> (<Operator> <AmountExpr>)?
//! ExactDate = "today" | "yesterday" | "tomorrow" | <Iso8601>
//! Date = <ExactDate> (<Operator> <AmountExpr>)?
//! Iterator = <Date> <Iterspec> ("until" <ExactDate> | <number> "times")?
//!
use nom::{IResult, space, alpha, alphanumeric, digit};
use std::str;
use std::str::FromStr;
named!(integer<i64>, alt!(
map_res!(
map_res!(
ws!(digit),
str::from_utf8
),
FromStr::from_str
)
));
// WARNING: Order is important here. Long tags first, shorter tags later
named!(unit_parser<Unit>, alt_complete!(
tag!("seconds") => { |_| Unit::Second } |
tag!("second") => { |_| Unit::Second } |
tag!("secs") => { |_| Unit::Second } |
tag!("sec") => { |_| Unit::Second } |
tag!("s") => { |_| Unit::Second } |
tag!("minutes") => { |_| Unit::Minute } |
tag!("minute") => { |_| Unit::Minute } |
tag!("mins") => { |_| Unit::Minute } |
tag!("min") => { |_| Unit::Minute } |
tag!("hours") => { |_| Unit::Hour } |
tag!("hour") => { |_| Unit::Hour } |
tag!("hrs") => { |_| Unit::Hour } |
tag!("hr") => { |_| Unit::Hour } |
tag!("days") => { |_| Unit::Day } |
tag!("day") => { |_| Unit::Day } |
tag!("d") => { |_| Unit::Day } |
tag!("weeks") => { |_| Unit::Week } |
tag!("week") => { |_| Unit::Week } |
tag!("w") => { |_| Unit::Week } |
tag!("months") => { |_| Unit::Month } |
tag!("month") => { |_| Unit::Month } |
tag!("years") => { |_| Unit::Year } |
tag!("year") => { |_| Unit::Year } |
tag!("yrs") => { |_| Unit::Year }
));
#[derive(Debug, PartialEq, Eq)]
pub enum Unit {
Second,
Minute,
Hour,
Day,
Week,
Month,
Year,
}
named!(operator_parser<Operator>, alt!(
tag!("+") => { |_| Operator::Plus } |
tag!("-") => { |_| Operator::Minus }
));
#[derive(Debug, PartialEq, Eq)]
pub enum Operator {
Plus,
Minus,
}
named!(amount_parser<Amount>, do_parse!(
number: integer >>
unit : unit_parser >>
(Amount(number, unit))
));
#[derive(Debug, PartialEq, Eq)]
pub struct Amount(i64, Unit);
named!(iter_spec<Iterspec>, alt_complete!(
tag!("secondly") => { |_| Iterspec::Secondly } |
tag!("minutely") => { |_| Iterspec::Minutely } |
tag!("hourly") => { |_| Iterspec::Hourly } |
tag!("daily") => { |_| Iterspec::Daily } |
tag!("weekly") => { |_| Iterspec::Weekly } |
tag!("monthly") => { |_| Iterspec::Monthly } |
tag!("yearly") => { |_| Iterspec::Yearly } |
do_parse!(
tag!("every") >>
number:integer >>
unit:unit_parser >>
(Iterspec::Every(number, unit))
)
));
#[derive(Debug, PartialEq, Eq)]
pub enum Iterspec {
Secondly,
Minutely,
Hourly,
Daily,
Weekly,
Monthly,
Yearly,
Every(i64, Unit),
}
use nom::whitespace::sp;
named!(amount_expr<AmountExpr>, do_parse!(
amount:amount_parser >>
opt!(sp) >>
o: opt!(do_parse!(op:operator_parser >> opt!(sp) >> amexp:amount_expr >> ((op, Box::new(amexp))))) >>
(AmountExpr { amount: amount, next: o, })
));
#[derive(Debug, PartialEq, Eq)]
pub struct AmountExpr {
amount: Amount,
next: Option<(Operator, Box<AmountExpr>)>,
}
impl AmountExpr {
fn new(amount: Amount, next: Option<(Operator, Box<AmountExpr>)>) -> AmountExpr {
AmountExpr {
amount: amount,
next: next
}
}
}
use iso8601::parsers::parse_date;
use iso8601::parsers::parse_datetime;
named!(exact_date_parser<ExactDate>, alt!(
tag!("today") => { |_| ExactDate::Today } |
tag!("yesterday") => { |_| ExactDate::Yesterday } |
tag!("tomorrow") => { |_| ExactDate::Tomorrow } |
do_parse!(d: parse_date >> (ExactDate::Iso8601Date(d))) |
do_parse!(d: parse_datetime >> (ExactDate::Iso8601DateTime(d)))
));
#[derive(Debug, PartialEq, Eq)]
pub enum ExactDate {
Today,
Yesterday,
Tomorrow,
Iso8601Date(::iso8601::Date),
Iso8601DateTime(::iso8601::DateTime)
}
named!(date<Date>, do_parse!(
exact:exact_date_parser >>
o: opt!(do_parse!(op:operator_parser >> a:amount_expr >> (op, a))) >>
(Date(exact, o))
));
#[derive(Debug, PartialEq, Eq)]
pub struct Date(ExactDate, Option<(Operator, AmountExpr)>);
named!(until_spec<UntilSpec>, alt!(
do_parse!(
tag!("until") >>
exact: exact_date_parser >>
(UntilSpec::Exact(exact))
) |
do_parse!(
num: integer >>
tag!("times") >>
(UntilSpec::Times(num))
)
));
#[derive(Debug, PartialEq, Eq)]
pub enum UntilSpec {
Exact(ExactDate),
Times(i64)
}
named!(iterator<Iterator>, do_parse!(
d: date >>
spec: iter_spec >>
until: opt!(until_spec) >>
(Iterator(d, spec, until))
));
pub struct Iterator(Date, Iterspec, Option<UntilSpec>);
|
