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Merge pull request #326 from HigherOrderCO/feature/sc-700/fix-empty-map-parsing
[sc-700] Fix empty map parsing
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@ -109,6 +109,19 @@ It's possible to assign to a pattern, like a tuple or superposition, which will
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(first, second) = (1, 2)
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```
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### Use
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```rust
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use x = 2 + 3
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return x + x
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```
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Inline copies of the declared bind, it is equivalent to this code:
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```rust
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return ((2 + 3) + (2 + 3))
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```
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### In-Place Operation
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```python
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@ -538,6 +551,16 @@ A List literal is surrounded by `[` `]`. The elements must be separated by `,`.
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It is desugared to constructor calls of the built-in type List, `List/cons(head, ~tail)` and `List/nil` .
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### Map Literals
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```python
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{ 0: 4, `hi`: "bye", 'c': 2 + 3 }
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x[0] = 5 # Assigns the key 0 to the value 5
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return x[0] # Gets the value of the key 0
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```
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Bend has a built-in binary tree map data structure where the key is a `u24`, meaning you can use numbers, characters, and symbols as keys.
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### List Comprehension
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```python
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@ -749,6 +772,19 @@ The let term will expects a binding value followed by a `next` term.
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Using `;` is optional.
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### Use
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```rust
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use x = (+ 2 3)
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(+ x x)
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```
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Inline copies of the declared bind, it is equivalent to this code:
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```rust
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(+ (+ 2 3) (+ 2 3))
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```
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### Switch
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```rust
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@ -116,6 +116,10 @@ impl<'a> PyParser<'a> {
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}
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'{' => {
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self.advance_one();
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self.skip_trivia();
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if self.try_consume_exactly("}") {
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return Ok(Expr::MapInit { entries: Vec::new() });
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}
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let head = self.parse_expr(false)?;
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self.skip_trivia();
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if self.starts_with(":") { self.parse_map_init(head)? } else { self.parse_sup(head)? }
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@ -127,6 +131,10 @@ impl<'a> PyParser<'a> {
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let val = STRINGS.get(str);
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Expr::Str { val }
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}
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'\'' => {
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let chr = self.parse_quoted_char()?;
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Expr::Num { val: Num::U24(chr as u32 & 0x00ff_ffff) }
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}
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'$' => {
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self.advance_one();
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let nam = self.parse_bend_name()?;
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