mirror of
https://codeberg.org/unspeaker/tengri.git
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dsl: exp -> expr, sym -> word
This commit is contained in:
parent
cf253c28f9
commit
ddd162f225
8 changed files with 330 additions and 325 deletions
267
dsl/src/dsl.rs
267
dsl/src/dsl.rs
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@ -18,7 +18,6 @@ pub(crate) use self::DslError::*;
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mod dsl_conv; pub use self::dsl_conv::*;
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mod dsl_ns; pub use self::dsl_ns::*;
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mod dsl_src; pub use self::dsl_src::*;
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mod dsl_type; pub use self::dsl_type::*;
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#[cfg(test)] mod dsl_test;
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/// DSL-specific result type.
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pub type DslResult<T> = Result<T, DslError>;
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@ -40,3 +39,269 @@ pub enum DslError {
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#[error("end reached")]
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End
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}
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fn ok_flat <T> (x: Option<DslPerhaps<T>>) -> DslPerhaps<T> {
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Ok(x.transpose()?.flatten())
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}
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pub const fn is_space (c: char) -> bool {
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matches!(c, ' '|'\n'|'\r'|'\t')
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}
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pub const fn no_trailing_non_space (
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src: &str, offset: usize, context: Option<&'static str>
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) -> DslResult<()> {
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Ok(for_each!((i, c) in char_indices(str_range(src, offset, src.len())) => if !is_space(c) {
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return Err(Unexpected(c, Some(offset + i), if let Some(context) = context {
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Some(context)
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} else {
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Some("trailing non-space")
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}))
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}))
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}
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pub const fn peek (src: &str) -> DslPerhaps<&str> {
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Ok(Some(if let Ok(Some(expr)) = expr_peek(src) { expr } else
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if let Ok(Some(word)) = word_peek(src) { word } else
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if let Ok(Some(num)) = num_peek(src) { num } else
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if let Ok(Some(text)) = text_peek(src) { text } else
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if let Err(e) = no_trailing_non_space(src, 0, Some("peek")) { return Err(e) }
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else { return Ok(None) }))
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}
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pub const fn seek (src: &str) -> DslPerhaps<(usize, usize)> {
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Ok(Some(if let Ok(Some(expr)) = expr_seek(src) { expr } else
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if let Ok(Some(word)) = word_seek(src) { word } else
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if let Ok(Some(num)) = num_seek(src) { num } else
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if let Ok(Some(text)) = text_seek(src) { text } else
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if let Err(e) = no_trailing_non_space(src, 0, Some("seek")) { return Err(e) }
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else { return Ok(None) }))
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}
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pub const fn peek_tail (src: &str) -> DslPerhaps<&str> {
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match seek(src) {
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Err(e) => Err(e),
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Ok(None) => Ok(None),
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Ok(Some((start, length))) => {
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let tail = str_range(src, start + length, src.len());
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for_each!((_i, c) in char_indices(tail) => if !is_space(c) { return Ok(Some(tail)) });
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Ok(None)
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},
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}
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}
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#[macro_export] macro_rules! dsl_type (($T:ident { $($trait:tt)* } {
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pub const fn $peek:ident $($_1:tt)?;
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pub const fn $peek_only:ident $($_2:tt)?;
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pub const fn $seek:ident $($_3:tt)?;
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pub const fn $seek_start:ident ($source1:ident) $body1:block
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pub const fn $seek_length:ident ($source2:ident) $body2:block
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})=>{
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pub trait $T: Dsl { $($trait)* }
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impl<D: Dsl> $T for D {}
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/// Find a slice corrensponding to a syntax token.
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pub const fn $peek (source: &str) -> DslPerhaps<&str> {
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match $seek(source) {
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Err(e) => Err(e),
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Ok(None) => Ok(None),
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Ok(Some((start, length))) => Ok(Some(str_range(source, start, start + length))),
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}
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}
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/// Find a slice corrensponding to a syntax token
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/// but return an error if it isn't the only thing
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/// in the source.
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pub const fn $peek_only (source: &str) -> DslPerhaps<&str> {
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match $seek(source) {
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Err(e) => Err(e),
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Ok(None) => Ok(None),
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Ok(Some((start, length))) => {
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if let Err(e) = no_trailing_non_space(source, start + length, Some("peek_only")) { return Err(e) }
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Ok(Some(str_range(source, start, start + length)))
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}
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}
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}
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/// Find a start and length corresponding to a syntax token.
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pub const fn $seek (source: &str) -> DslPerhaps<(usize, usize)> {
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match $seek_start(source) {
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Err(e) => Err(e),
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Ok(None) => Ok(None),
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Ok(Some(start)) => match $seek_length(str_from(source, start)) {
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Ok(Some(length)) => Ok(Some((start, length))),
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Ok(None) => Ok(None),
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Err(e) => Err(e),
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},
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}
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}
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pub const fn $seek_start ($source1: &str) -> DslPerhaps<usize> $body1
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pub const fn $seek_length ($source2: &str) -> DslPerhaps<usize> $body2
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});
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pub const fn is_expr_start (c: char) -> bool { c == '(' }
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pub const fn is_expr_end (c: char) -> bool { c == ')' }
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dsl_type!(DslExpr {
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fn expr (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(expr_peek_inner_only))}
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fn head (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(peek))}
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fn tail (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(peek_tail))}
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/// my other car is a cdr :<
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fn each (&self, mut cb: impl FnMut(&str)->Usually<()>) -> Usually<()> {
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Ok(if let Some(head) = self.head()? {
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cb(head)?;
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if let Some(tail) = self.tail()? {
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tail.each(cb)?;
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}
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})
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}
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} {
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pub const fn expr_peek [generated];
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pub const fn expr_peek_only [generated];
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pub const fn expr_seek [generated];
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pub const fn expr_seek_start (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_expr_start(c) { return Ok(Some(i)) } else
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if !is_space(c) { return Err(Unexpected(c, Some(i), Some("expected expression start"))) });
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Ok(None)
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}
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pub const fn expr_seek_length (src) {
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let mut depth = 0;
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for_each!((i, c) in char_indices(src) =>
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if is_expr_start(c) { depth += 1; } else
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if is_expr_end(c) {
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if depth == 0 {
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return Err(Unexpected(c, Some(i), Some("expected expression end")))
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} else if depth == 1 {
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return Ok(Some(i + 1))
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} else {
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depth -= 1;
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}
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});
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Err(Incomplete)
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}
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});
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pub const fn expr_peek_inner (src: &str) -> DslPerhaps<&str> {
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match expr_peek(src) {
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Ok(Some(peeked)) => {
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let len = peeked.len();
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let start = if len > 0 { 1 } else { 0 };
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Ok(Some(str_range(src, start, start + len.saturating_sub(2))))
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},
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e => e
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}
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}
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pub const fn expr_peek_inner_only (src: &str) -> DslPerhaps<&str> {
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match expr_seek(src) {
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Err(e) => Err(e),
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Ok(None) => Ok(None),
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Ok(Some((start, length))) => {
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if let Err(e) = no_trailing_non_space(src, start + length, Some("expr_peek_inner_only")) { return Err(e) }
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let peeked = str_range(src, start, start + length);
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let len = peeked.len();
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let start = if len > 0 { 1 } else { 0 };
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Ok(Some(str_range(peeked, start, start + len.saturating_sub(2))))
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},
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}
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}
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pub const fn is_word_char (c: char) -> bool {
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matches!(c, 'a'..='z'|'A'..='Z'|'0'..='9'|'-'|'/'|'@'|':')
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}
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pub const fn is_word_end (c: char) -> bool {
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is_space(c) || is_expr_end(c)
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}
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dsl_type!(DslWord {
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fn word (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(word_peek_only))}
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} {
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pub const fn word_peek [generated];
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pub const fn word_peek_only [generated];
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pub const fn word_seek [generated];
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pub const fn word_seek_start (src) {
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for_each!((i, c) in char_indices(src) => if
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is_word_char(c) { return Ok(Some(i)) } else
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if !is_space(c) { return Err(Unexpected(c, Some(i), Some("word_seek_start"))) });
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Ok(None)
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}
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pub const fn word_seek_length (src) {
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for_each!((i, c) in char_indices(src) => if !is_word_char(c) { return Ok(Some(i)) });
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Ok(Some(src.len()))
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}
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});
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pub const fn is_text_start (c: char) -> bool { matches!(c, '"') }
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pub const fn is_text_end (c: char) -> bool { matches!(c, '"') }
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dsl_type!(DslText {
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fn text (&self) -> DslPerhaps<&str> { ok_flat(self.src()?.map(text_peek_only)) }
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} {
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pub const fn text_peek [generated];
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pub const fn text_peek_only [generated];
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pub const fn text_seek [generated];
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pub const fn text_seek_start (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_text_start(c) { return Ok(Some(i)) } else
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if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
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Ok(None)
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}
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pub const fn text_seek_length (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_text_end(c) { return Ok(Some(i)) });
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Ok(None)
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}
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});
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pub const fn is_key_start (c: char) -> bool { matches!(c, '/'|('a'..='z')) }
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pub const fn is_key_char (c: char) -> bool { is_key_start(c) || matches!(c, '0'..='9'|'-') }
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pub const fn is_key_end (c: char) -> bool { !is_key_char(c) }
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dsl_type!(DslKey {
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fn key (&self) -> DslPerhaps<&str> { ok_flat(self.src()?.map(key_peek_only)) }
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} {
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pub const fn key_peek [generated];
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pub const fn key_peek_only [generated];
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pub const fn key_seek [generated];
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pub const fn key_seek_start (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_key_start(c) { return Ok(Some(i)) } else
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if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
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Ok(None)
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}
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pub const fn key_seek_length (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_key_end(c) { return Ok(Some(i)) } else
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if !is_key_char(c) { return Err(Unexpected(c, Some(i), None)) });
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Ok(Some(src.len()))
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}
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});
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dsl_type!(DslNum {
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fn num (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(num_peek_only))}
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} {
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pub const fn num_peek [generated];
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pub const fn num_peek_only [generated];
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pub const fn num_seek [generated];
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pub const fn num_seek_start (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_digit(c) { return Ok(Some(i)); } else
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if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
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Ok(None)
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}
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pub const fn num_seek_length (src) {
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for_each!((i, c) in char_indices(src) =>
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if is_num_end(c) { return Ok(Some(i)) } else
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if !is_digit(c) { return Err(Unexpected(c, Some(i), None)) });
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Ok(None)
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}
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});
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pub const fn is_digit (c: char) -> bool { matches!(c, '0'..='9') }
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pub const fn is_num_end (c: char) -> bool { matches!(c, ' '|'\n'|'\r'|'\t'|')') }
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pub const fn to_number (digits: &str) -> Result<usize, DslError> {
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let mut iter = char_indices(digits);
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let mut value = 0;
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while let Some(((_, c), next)) = iter.next() {
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match to_digit(c) {
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Ok(digit) => value = 10 * value + digit,
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Err(e) => return Err(e),
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}
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iter = next;
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}
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Ok(value)
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}
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pub const fn to_digit (c: char) -> Result<usize, DslError> {
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Ok(match c {
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'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4,
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'5' => 5, '6' => 6, '7' => 7, '8' => 8, '9' => 9,
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_ => return Err(Unexpected(c, None, Some("parse digit")))
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})
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}
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@ -10,18 +10,18 @@ use crate::*;
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// Special form for numeric types
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(num |$state:ident : $State: ty| -> $Type:ty { $( $pat:tt => $body:expr ),* $(,)? }) => {
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impl<'t> DslNs<'t, $Type> for $State {
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const SYMS: DslNsMap<'t, fn (&'t $State)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@sym ($state: $State) -> $Type { $pat => $body }}),*]);
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const EXPS: DslNsMap<'t, fn (&'t $State, &str)->Perhaps<$Type>> =
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const WORDS: DslNsMap<'t, fn (&'t $State)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@word ($state: $State) -> $Type { $pat => $body }}),*]);
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const EXPRS: DslNsMap<'t, fn (&'t $State, &str)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@exp ($state: $State) -> $Type { $pat => $body }}),*]);
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fn from <D: Dsl> (&'t self, dsl: D) -> Perhaps<$Type> {
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if let Ok(Some(src)) = dsl.src() {
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if let Ok(Some(num)) = src.num() {
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Ok(Some(to_number(num)? as $Type))
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} else if let Ok(Some(src)) = src.sym() {
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self.from_sym(src)
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if let Ok(num) = to_number(src) {
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Ok(Some(num as $Type))
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} else if let Ok(Some(src)) = src.word() {
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self.from_word(src)
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} else {
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self.from_exp(src)
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self.from_expr(src)
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}
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} else {
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Ok(None)
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@ -36,17 +36,17 @@ use crate::*;
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// Regular form for single type
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(|$state:ident : $State: ty| -> $Type:ty { $( $pat:tt => $body:expr ),* $(,)? }) => {
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impl<'t> DslNs<'t, $Type> for $State {
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const SYMS: DslNsMap<'t, fn (&'t $State)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@sym ($state: $State) -> $Type { $pat => $body }}),*]);
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const EXPS: DslNsMap<'t, fn (&'t $State, &str)->Perhaps<$Type>> =
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const WORDS: DslNsMap<'t, fn (&'t $State)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@word ($state: $State) -> $Type { $pat => $body }}),*]);
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const EXPRS: DslNsMap<'t, fn (&'t $State, &str)->Perhaps<$Type>> =
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DslNsMap::new(&[$(dsl_ns!{@exp ($state: $State) -> $Type { $pat => $body }}),*]);
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}
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};
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// Symbols only.
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(@sym ($state:ident: $State:ty) -> $Type:ty {
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$sym:literal => $body:expr
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(@word ($state:ident: $State:ty) -> $Type:ty {
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$word:literal => $body:expr
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}) => {
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($sym, |$state|Ok(Some($body)))
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($word, |$state|Ok(Some($body)))
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};
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// Expression handlers only.
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(@exp ($state:ident: $State:ty) -> $Type:ty {
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@ -54,17 +54,21 @@ use crate::*;
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}) => { ($head, |$state, tail: &str|{
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$(
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let head = tail.head()?.unwrap_or_default();
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let tail = tail.tail()?.unwrap_or_default();
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let $arg: $ty = if let Some(arg) = $state.from(&head)? {
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arg
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} else {
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return Err(format!("missing argument: {}", stringify!($arg)).into())
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return Err(format!("{}: missing argument: {} ({}); got: {tail}",
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$head,
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stringify!($arg),
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stringify!($Type),
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).into())
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};
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let tail = tail.tail()?.unwrap_or_default();
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)*
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Ok(Some($body))
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}) };
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// Nothing else in symbols.
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(@sym ($state:ident: $State:ty) -> $Type:ty { $pat:tt => $body:expr }) => {
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(@word ($state:ident: $State:ty) -> $Type:ty { $pat:tt => $body:expr }) => {
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("", |_|Ok(None)) // FIXME don't emit at all
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};
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// Nothing else in expression handlers.
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@ -75,42 +79,45 @@ use crate::*;
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);
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pub trait DslNs<'t, T: 't>: 't {
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/// Known symbols.
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const SYMS: DslNsMap<'t, fn (&'t Self)->Perhaps<T>> = DslNsMap::new(&[]);
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/// Known expressions.
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const EXPS: DslNsMap<'t, fn (&'t Self, &str)->Perhaps<T>> = DslNsMap::new(&[]);
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/// Resolve a symbol if known.
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fn from_sym <D: Dsl> (&'t self, dsl: D) -> Perhaps<T> {
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if let Some(dsl) = dsl.sym()? {
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for (sym, get) in Self::SYMS.0 { if dsl == *sym { return get(self) } }
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}
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return Ok(None)
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}
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/// Resolve an expression if known.
|
||||
fn from_exp <D: Dsl> (&'t self, dsl: D) -> Perhaps<T> {
|
||||
if let Some(exp) = dsl.exp()? {
|
||||
for (key, value) in Self::EXPS.0.iter() {
|
||||
if exp.head() == Ok(Some(key)) { return value(self, exp.tail()?.unwrap_or("")) }
|
||||
}
|
||||
}
|
||||
return Ok(None)
|
||||
}
|
||||
/// Resolve an expression or symbol.
|
||||
fn from <D: Dsl> (&'t self, dsl: D) -> Perhaps<T> {
|
||||
if let Ok(Some(src)) = dsl.src() {
|
||||
if let Ok(Some(src)) = src.sym() {
|
||||
self.from_sym(src)
|
||||
if let Ok(Some(src)) = src.word() {
|
||||
self.from_word(src)
|
||||
} else {
|
||||
self.from_exp(src)
|
||||
self.from_expr(src)
|
||||
}
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
/// Resolve a symbol if known.
|
||||
fn from_word <D: Dsl> (&'t self, dsl: D) -> Perhaps<T> {
|
||||
if let Some(dsl) = dsl.word()? {
|
||||
for (word, get) in Self::WORDS.0 { if dsl == *word { return get(self) } }
|
||||
}
|
||||
return Ok(None)
|
||||
}
|
||||
/// Resolve an expression if known.
|
||||
fn from_expr <D: Dsl> (&'t self, dsl: D) -> Perhaps<T> {
|
||||
if let Some(head) = dsl.expr().head()? {
|
||||
for (key, value) in Self::EXPRS.0.iter() {
|
||||
if head == *key {
|
||||
return value(self, dsl.expr().tail()?.unwrap_or(""))
|
||||
}
|
||||
}
|
||||
}
|
||||
return Ok(None)
|
||||
}
|
||||
/// Known symbols.
|
||||
const WORDS: DslNsMap<'t, fn (&'t Self)->Perhaps<T>> = DslNsMap::new(&[]);
|
||||
/// Known expressions.
|
||||
const EXPRS: DslNsMap<'t, fn (&'t Self, &str)->Perhaps<T>> = DslNsMap::new(&[]);
|
||||
}
|
||||
/// Namespace mapping.
|
||||
pub struct DslNsMap<'t, T: 't>(pub &'t [(&'t str, T)]);
|
||||
impl<'t, T: 't> DslNsMap<'t, T> {
|
||||
#[derive(Debug)]
|
||||
pub struct DslNsMap<'t, T: Debug + 't>(pub &'t [(&'t str, T)]);
|
||||
impl<'t, T: Debug + 't> DslNsMap<'t, T> {
|
||||
/// Populate a namespace.
|
||||
pub const fn new (data: &'t [(&'t str, T)]) -> Self {
|
||||
Self(data) // TODO build search index
|
||||
|
|
|
|||
|
|
@ -1,267 +0,0 @@
|
|||
use crate::*;
|
||||
|
||||
fn ok_flat <T> (x: Option<DslPerhaps<T>>) -> DslPerhaps<T> {
|
||||
Ok(x.transpose()?.flatten())
|
||||
}
|
||||
pub const fn is_space (c: char) -> bool {
|
||||
matches!(c, ' '|'\n'|'\r'|'\t')
|
||||
}
|
||||
pub const fn no_trailing_non_space (
|
||||
src: &str, offset: usize, context: Option<&'static str>
|
||||
) -> DslResult<()> {
|
||||
Ok(for_each!((i, c) in char_indices(str_range(src, offset, src.len())) => if !is_space(c) {
|
||||
return Err(Unexpected(c, Some(offset + i), if let Some(context) = context {
|
||||
Some(context)
|
||||
} else {
|
||||
Some("trailing non-space")
|
||||
}))
|
||||
}))
|
||||
}
|
||||
pub const fn peek (src: &str) -> DslPerhaps<&str> {
|
||||
Ok(Some(if let Ok(Some(exp)) = exp_peek(src) { exp } else
|
||||
if let Ok(Some(sym)) = sym_peek(src) { sym } else
|
||||
if let Ok(Some(num)) = num_peek(src) { num } else
|
||||
if let Ok(Some(text)) = text_peek(src) { text } else
|
||||
if let Err(e) = no_trailing_non_space(src, 0, Some("peek")) { return Err(e) }
|
||||
else { return Ok(None) }))
|
||||
}
|
||||
pub const fn seek (src: &str) -> DslPerhaps<(usize, usize)> {
|
||||
Ok(Some(if let Ok(Some(exp)) = exp_seek(src) { exp } else
|
||||
if let Ok(Some(sym)) = sym_seek(src) { sym } else
|
||||
if let Ok(Some(num)) = num_seek(src) { num } else
|
||||
if let Ok(Some(text)) = text_seek(src) { text } else
|
||||
if let Err(e) = no_trailing_non_space(src, 0, Some("seek")) { return Err(e) }
|
||||
else { return Ok(None) }))
|
||||
}
|
||||
pub const fn peek_tail (src: &str) -> DslPerhaps<&str> {
|
||||
match seek(src) {
|
||||
Err(e) => Err(e),
|
||||
Ok(None) => Ok(None),
|
||||
Ok(Some((start, length))) => {
|
||||
let tail = str_range(src, start + length, src.len());
|
||||
for_each!((_i, c) in char_indices(tail) => if !is_space(c) { return Ok(Some(tail)) });
|
||||
Ok(None)
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
#[macro_export] macro_rules! dsl_type (($T:ident { $($trait:tt)* } {
|
||||
pub const fn $peek:ident $($_1:tt)?;
|
||||
pub const fn $peek_only:ident $($_2:tt)?;
|
||||
pub const fn $seek:ident $($_3:tt)?;
|
||||
pub const fn $seek_start:ident ($source1:ident) $body1:block
|
||||
pub const fn $seek_length:ident ($source2:ident) $body2:block
|
||||
})=>{
|
||||
pub trait $T: Dsl { $($trait)* }
|
||||
impl<D: Dsl> $T for D {}
|
||||
/// Find a slice corrensponding to a syntax token.
|
||||
pub const fn $peek (source: &str) -> DslPerhaps<&str> {
|
||||
match $seek(source) {
|
||||
Err(e) => Err(e),
|
||||
Ok(None) => Ok(None),
|
||||
Ok(Some((start, length))) => Ok(Some(str_range(source, start, start + length))),
|
||||
}
|
||||
}
|
||||
/// Find a slice corrensponding to a syntax token
|
||||
/// but return an error if it isn't the only thing
|
||||
/// in the source.
|
||||
pub const fn $peek_only (source: &str) -> DslPerhaps<&str> {
|
||||
match $seek(source) {
|
||||
Err(e) => Err(e),
|
||||
Ok(None) => Ok(None),
|
||||
Ok(Some((start, length))) => {
|
||||
if let Err(e) = no_trailing_non_space(source, start + length, Some("peek_only")) { return Err(e) }
|
||||
Ok(Some(str_range(source, start, start + length)))
|
||||
}
|
||||
}
|
||||
}
|
||||
/// Find a start and length corresponding to a syntax token.
|
||||
pub const fn $seek (source: &str) -> DslPerhaps<(usize, usize)> {
|
||||
match $seek_start(source) {
|
||||
Err(e) => Err(e),
|
||||
Ok(None) => Ok(None),
|
||||
Ok(Some(start)) => match $seek_length(str_from(source, start)) {
|
||||
Ok(Some(length)) => Ok(Some((start, length))),
|
||||
Ok(None) => Ok(None),
|
||||
Err(e) => Err(e),
|
||||
},
|
||||
}
|
||||
}
|
||||
pub const fn $seek_start ($source1: &str) -> DslPerhaps<usize> $body1
|
||||
pub const fn $seek_length ($source2: &str) -> DslPerhaps<usize> $body2
|
||||
});
|
||||
|
||||
pub const fn is_exp_start (c: char) -> bool { c == '(' }
|
||||
pub const fn is_exp_end (c: char) -> bool { c == ')' }
|
||||
dsl_type!(DslExp {
|
||||
fn exp (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(exp_peek_inner_only))}
|
||||
fn head (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(peek))}
|
||||
fn tail (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(peek_tail))}
|
||||
/// my other car is a cdr :<
|
||||
fn each (&self, mut cb: impl FnMut(&str)->Usually<()>) -> Usually<()> {
|
||||
Ok(if let Some(head) = self.head()? {
|
||||
cb(head)?;
|
||||
if let Some(tail) = self.tail()? {
|
||||
tail.each(cb)?;
|
||||
}
|
||||
})
|
||||
}
|
||||
} {
|
||||
pub const fn exp_peek [generated];
|
||||
pub const fn exp_peek_only [generated];
|
||||
pub const fn exp_seek [generated];
|
||||
pub const fn exp_seek_start (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_exp_start(c) { return Ok(Some(i)) } else
|
||||
if !is_space(c) { return Err(Unexpected(c, Some(i), Some("expected expression start"))) });
|
||||
Ok(None)
|
||||
}
|
||||
pub const fn exp_seek_length (src) {
|
||||
let mut depth = 0;
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_exp_start(c) { depth += 1; } else
|
||||
if is_exp_end(c) {
|
||||
if depth == 0 {
|
||||
return Err(Unexpected(c, Some(i), Some("expected expression end")))
|
||||
} else if depth == 1 {
|
||||
return Ok(Some(i + 1))
|
||||
} else {
|
||||
depth -= 1;
|
||||
}
|
||||
});
|
||||
Err(Incomplete)
|
||||
}
|
||||
});
|
||||
|
||||
pub const fn exp_peek_inner (src: &str) -> DslPerhaps<&str> {
|
||||
match exp_peek(src) {
|
||||
Ok(Some(peeked)) => {
|
||||
let len = peeked.len();
|
||||
let start = if len > 0 { 1 } else { 0 };
|
||||
Ok(Some(str_range(src, start, start + len.saturating_sub(2))))
|
||||
},
|
||||
e => e
|
||||
}
|
||||
}
|
||||
|
||||
pub const fn exp_peek_inner_only (src: &str) -> DslPerhaps<&str> {
|
||||
match exp_seek(src) {
|
||||
Err(e) => Err(e),
|
||||
Ok(None) => Ok(None),
|
||||
Ok(Some((start, length))) => {
|
||||
if let Err(e) = no_trailing_non_space(src, start + length, Some("exp_peek_inner_only")) { return Err(e) }
|
||||
let peeked = str_range(src, start, start + length);
|
||||
let len = peeked.len();
|
||||
let start = if len > 0 { 1 } else { 0 };
|
||||
Ok(Some(str_range(peeked, start, start + len.saturating_sub(2))))
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
pub const fn is_sym_start (c: char) -> bool { is_sym_char(c) }
|
||||
pub const fn is_sym_char (c: char) -> bool { matches!(c, 'a'..='z'|'A'..='Z'|'0'..='9'|'-'|'/'|'@'|':') }
|
||||
pub const fn is_sym_end (c: char) -> bool { is_space(c) || is_exp_end(c) }
|
||||
dsl_type!(DslSym {
|
||||
fn sym (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(sym_peek_only))}
|
||||
} {
|
||||
pub const fn sym_peek [generated];
|
||||
pub const fn sym_peek_only [generated];
|
||||
pub const fn sym_seek [generated];
|
||||
pub const fn sym_seek_start (src) {
|
||||
for_each!((i, c) in char_indices(src) => if
|
||||
is_sym_start(c) { return Ok(Some(i)) } else
|
||||
if !is_space(c) { return Err(Unexpected(c, Some(i), Some("sym_seek_start"))) });
|
||||
Ok(None)
|
||||
}
|
||||
pub const fn sym_seek_length (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_sym_end(c) { return Ok(Some(i)) } else
|
||||
if !is_sym_char(c) { return Err(Unexpected(c, Some(i), Some("sym_seek_length"))) });
|
||||
Ok(Some(src.len()))
|
||||
}
|
||||
});
|
||||
|
||||
pub const fn is_text_start (c: char) -> bool { matches!(c, '"') }
|
||||
pub const fn is_text_end (c: char) -> bool { matches!(c, '"') }
|
||||
dsl_type!(DslText {
|
||||
fn text (&self) -> DslPerhaps<&str> { ok_flat(self.src()?.map(text_peek_only)) }
|
||||
} {
|
||||
pub const fn text_peek [generated];
|
||||
pub const fn text_peek_only [generated];
|
||||
pub const fn text_seek [generated];
|
||||
pub const fn text_seek_start (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_text_start(c) { return Ok(Some(i)) } else
|
||||
if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
|
||||
Ok(None)
|
||||
}
|
||||
pub const fn text_seek_length (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_text_end(c) { return Ok(Some(i)) });
|
||||
Ok(None)
|
||||
}
|
||||
});
|
||||
|
||||
pub const fn is_key_start (c: char) -> bool { matches!(c, '/'|('a'..='z')) }
|
||||
pub const fn is_key_char (c: char) -> bool { is_key_start(c) || matches!(c, '0'..='9'|'-') }
|
||||
pub const fn is_key_end (c: char) -> bool { !is_key_char(c) }
|
||||
dsl_type!(DslKey {
|
||||
fn key (&self) -> DslPerhaps<&str> { ok_flat(self.src()?.map(key_peek_only)) }
|
||||
} {
|
||||
pub const fn key_peek [generated];
|
||||
pub const fn key_peek_only [generated];
|
||||
pub const fn key_seek [generated];
|
||||
pub const fn key_seek_start (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_key_start(c) { return Ok(Some(i)) } else
|
||||
if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
|
||||
Ok(None)
|
||||
}
|
||||
pub const fn key_seek_length (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_key_end(c) { return Ok(Some(i)) } else
|
||||
if !is_key_char(c) { return Err(Unexpected(c, Some(i), None)) });
|
||||
Ok(Some(src.len()))
|
||||
}
|
||||
});
|
||||
|
||||
dsl_type!(DslNum {
|
||||
fn num (&self) -> DslPerhaps<&str> {ok_flat(self.src()?.map(num_peek_only))}
|
||||
} {
|
||||
pub const fn num_peek [generated];
|
||||
pub const fn num_peek_only [generated];
|
||||
pub const fn num_seek [generated];
|
||||
pub const fn num_seek_start (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_digit(c) { return Ok(Some(i)); } else
|
||||
if !is_space(c) { return Err(Unexpected(c, Some(i), None)) });
|
||||
Ok(None)
|
||||
}
|
||||
pub const fn num_seek_length (src) {
|
||||
for_each!((i, c) in char_indices(src) =>
|
||||
if is_num_end(c) { return Ok(Some(i)) } else
|
||||
if !is_digit(c) { return Err(Unexpected(c, Some(i), None)) });
|
||||
Ok(None)
|
||||
}
|
||||
});
|
||||
pub const fn is_digit (c: char) -> bool { matches!(c, '0'..='9') }
|
||||
pub const fn is_num_end (c: char) -> bool { matches!(c, ' '|'\n'|'\r'|'\t'|')') }
|
||||
pub const fn to_number (digits: &str) -> Result<usize, DslError> {
|
||||
let mut iter = char_indices(digits);
|
||||
let mut value = 0;
|
||||
while let Some(((_, c), next)) = iter.next() {
|
||||
match to_digit(c) {
|
||||
Ok(digit) => value = 10 * value + digit,
|
||||
Err(e) => return Err(e),
|
||||
}
|
||||
iter = next;
|
||||
}
|
||||
Ok(value)
|
||||
}
|
||||
pub const fn to_digit (c: char) -> Result<usize, DslError> {
|
||||
Ok(match c {
|
||||
'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4,
|
||||
'5' => 5, '6' => 6, '7' => 7, '8' => 8, '9' => 9,
|
||||
_ => return Err(Unexpected(c, None, Some("parse digit")))
|
||||
})
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue