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125 lines
2.2 KiB
Markdown
125 lines
2.2 KiB
Markdown
# Leo Parser
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[](https://crates.io/crates/leo-parser)
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[](../AUTHORS)
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[](./LICENSE.md)
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This directory contains the code to tokenize, lex and parse Leo files to the [Leo AST](./../ast/README.md).
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## Tokenizer
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The tokenizer contains all tokens in Leo.
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It also decides which tokens are keywords.
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Meaning that keywords are a subset of tokens.
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The lexer goes through character by character as bytes, and converts the bytes into the tokens.
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### Tokens
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Bolded ones are also keywords.
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#### Literals
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- CommentLine
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- CommentBlock
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- StringLit
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- Ident
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- Int
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- **True**
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- **False**
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- AddressLit
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- CharLit
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#### Symbols
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- At
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- Not
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- And (`&&`)
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- Ampersand (`&`)
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- Or
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- Eq
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- NotEq
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- Lt
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- LtEq
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- Gt
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- GtEq
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- Add
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- Minus
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- Mul
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- Div
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- Exp
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- Assign
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- AddEq
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- MinusEq
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- MulEq
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- DivEq
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- ExpEq
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- LeftParen
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- RightParen
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- LeftSquare
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- RightSquare
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- LeftCurly
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- RightCurly
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- Comma
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- Dot
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- DotDot
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- DotDotDot
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- Semicolon
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- Colon
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- DoubleColon
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- Question
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- Arrow
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- Underscore
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#### Types
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- **U8**
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- **U16**
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- **U32**
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- **U64**
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- **U128**
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- **I8**
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- **I16**
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- **I32**
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- **I64**
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- **I128**
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- **Field**
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- **Group**
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- **Bool**
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- **Address**
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- **Char**
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- **BigSelf**
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#### Words
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- **Input**
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- **LittleSelf**
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- **Import**
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- **As**
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- **Circuit**
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- **Console**
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- **Const**
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- **Else**
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- **For**
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- **Function**
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- **If**
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- **In**
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- **Let**
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- **Return**
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- **Static**
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- **String**
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#### Meta
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- Eof
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## Parser
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The parser converts the tokens to the [Leo AST](./../ast/README.md).
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The parser is broken down to different files that correspond to different aspects of the AST:
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- [File](./src/parser/file.rs) - Parses the top level nodes in Leo.
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- [Types](./src/parser/type_.rs) - Parses the type declarations in Leo.
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- [Statements](./src/parser/statement.rs) - Parses the different kinds of statements.
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- [Expressions](./src/parser/expression.rs) - Parses the different kinds of expressions.
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For more information on those please read the Leo AST README, linked above.
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## Grammar Relation
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All function and token names are as close as possible to the [Leo Grammar](./../grammar/README.md)
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