# C-val Compiler

## Lexical Spec

* LBRACK `[`
* RBRACK `]`
* LCURLY `{`
* RCURLY `}`
* LPAREN `(`
* RPAREN `)`
* ID `[any character without whitespace]+`
* SEMI `;`
* COMMA `,`
* ARROW `->`
* STAR `*`
* ANDREF `&`
* DOLLAR `$`
* COMMENT `//`
* NUM `[0-9]*`
* VAL
* STRING `"{any}"`

## Syntax Spec

```spec
program     := defn*

defn        := VAL type ID ;
             | VAL type ID expr ;

type        := ID | type STAR
             | LBRACK RBRACK | LBRACK type RBRACK
             | LBRACK type* ARROW type? RBRACK

expr        := atom atom*

atom        := ID
             | NUM
             | STR
             | lambda
             | compound
             | STAR
             | ANDREF

stmt        := defn
             | expr ;        // expr statement
             | return expr ; // return statement
             | DOLLAR ID expr ;   // assignment statement
             | if expr compound ;               // if statement
             | if expr compound else compound ; // if-else statement

param_list  := LPAREN (type ID)* RPAREN

lambda      := param_list compound

compound    := LCURLY (stmt)* expr? RCURLY
```