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90 lines
2.4 KiB
Rust
90 lines
2.4 KiB
Rust
//! Functions having to do with parser keywords, like testing if a function is a block command.
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use crate::wchar::prelude::*;
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struct ReservedWord {
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text: &'static wstr,
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is_reserved: bool,
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is_super_command: bool,
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}
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macro_rules! rw {
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( ( $text:literal ) ) => {
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ReservedWord {
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text: L!($text),
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is_reserved: true,
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is_super_command: false,
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}
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};
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( ( $text:literal, [subcommand] ) ) => {
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ReservedWord {
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text: L!($text),
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is_reserved: true,
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is_super_command: true,
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}
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};
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( ( $text:literal, [subcommand], not reserved ) ) => {
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ReservedWord {
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text: L!($text),
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is_reserved: false,
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is_super_command: true,
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}
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};
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}
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macro_rules! reserved_words {
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( $( $reserved_word:tt , ) * ) => {
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&[ $( rw!($reserved_word), )* ]
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}
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}
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// Don't forget to add any new reserved keywords to the documentation
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const RESERVED_WORDS: &[ReservedWord] = reserved_words!(
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("!", [subcommand], not reserved),
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("["),
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("_"),
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("and", [subcommand]),
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("argparse"),
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("begin", [subcommand]),
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("break"),
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("builtin", [subcommand]),
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("case"),
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("command", [subcommand]),
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("continue"),
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("else", [subcommand]),
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("end"),
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("eval"),
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("exec", [subcommand]),
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("for"),
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("function"),
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("if", [subcommand]),
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("not", [subcommand]),
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("or", [subcommand]),
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("read"),
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("return"),
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("set"),
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("status"),
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("string"),
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("switch"),
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("test"),
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("time", [subcommand]),
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("while", [subcommand]),
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);
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fn reserved_word(cmd: &wstr) -> Option<&'static ReservedWord> {
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RESERVED_WORDS
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.iter()
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.find(|reserved_word| reserved_word.text == cmd)
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}
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/// Tests if the specified command's parameters should be interpreted as another command.
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pub fn parser_keywords_is_subcommand(cmd: &impl AsRef<wstr>) -> bool {
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reserved_word(cmd.as_ref()).is_some_and(|reserved_word| reserved_word.is_super_command)
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}
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/// Tests if the specified command is a reserved word, i.e. if it is the name of one of the builtin
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/// functions that change the block or command scope, like 'for', 'end' or 'command' or 'exec'.
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/// These functions may not be overloaded, so their names are reserved.
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pub fn parser_keywords_is_reserved(word: &wstr) -> bool {
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reserved_word(word).is_some_and(|reserved_word| reserved_word.is_reserved)
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}
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