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63 lines
2.1 KiB
63 lines
2.1 KiB
use crate::{format::LineCfg, Date, Time, TimeFile};
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use std::collections::BTreeMap;
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/// A set of IR parsed items that makes up a whole cass file
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pub(crate) type IrStream = Vec<IrItem>;
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/// Intermediate representation for parsing and generating files
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///
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/// The CASS IR is largely based on the output of the parser's
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/// [`LineCfg`](crate::format::LineCfg), but with concrete types used
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/// in the data layer (namely [`Date`][date] and [`Time`][time]),
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/// while also keeping track of the line numbers to allow idempotent
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/// file changes.
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///
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/// Something not yet implemented is comment pass-through (this needs
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/// to happen in the parser first), but will likely be implemented in
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/// a future version.
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///
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/// [date]: crate::Date
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/// [time]: crate::Time
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#[derive(Debug, Clone)]
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pub(crate) struct IrItem {
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pub(crate) tt: IrType,
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pub(crate) lo: usize,
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}
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/// Disambiguate between different IR line types with their payload
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#[derive(Debug, Clone)]
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pub(crate) enum IrType {
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/// A line with parsed header information
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Header(BTreeMap<String, String>),
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/// Start a session at a given timestapm
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Start(Time),
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/// Stop a session at a given timestamp
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Stop(Time),
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/// Invoice a block of previous work
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Invoice(Date),
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/// An item that gets ignored
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Ignore,
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}
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/// Generate a stream of IR items from the raw parser output
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pub(crate) fn generate_ir(buf: impl Iterator<Item = LineCfg>) -> IrStream {
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buf.enumerate().fold(vec![], |mut buf, (lo, item)| {
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#[cfg_attr(rustfmt, rustfmt_skip)]
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buf.push(match item {
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LineCfg::Header(map) => IrItem { tt: IrType::Header(map), lo },
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LineCfg::Start(Some(time)) => IrItem { tt: IrType::Start(time.into()), lo },
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LineCfg::Stop(Some(time)) => IrItem { tt: IrType::Stop(time.into()), lo },
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LineCfg::Invoice(Some(date)) => IrItem { tt: IrType::Invoice(date.into()), lo },
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LineCfg::Ignore => IrItem { tt: IrType::Ignore, lo },
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_ => IrItem { tt: IrType::Ignore, lo },
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});
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buf
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})
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}
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pub(crate) trait MakeIr {
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/// Make a new IR line from an object
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fn make_ir(&self) -> IrType;
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}
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