/**
 * C1 AST
 *
 * Aims to mostly-faithfully capture the the C1 Grammar as described in
 * http://c0.typesafety.net/doc/c0-reference.pdf
 *
 * Exceptions:
 *  - Does not distinguish <sid>, <vid>, <fid>, and <aid> categories. These are used by the parser to
 *    disambiguate syntactic forms (especially the unfortunate <aid> vs. <tid> distinction needed to parse the
 *    statement `x * y;` as a binary expression or variable declaration). Within a full syntax tree
 *    they are unambiguous and can all be represented with Identifier.
 *  - The restrictions that a variable declaration not appear in the update of a ForStatement is expressed
 *    (this is a property of static semantics in the spec, see C0.23, "The step statement in a for loop may
 *    not be a declaration".).
 *  - SimpleStatement does not include variable declarations, which facilitates the above exception.
 *  - The placement restrictions on requires, ensures, loop_invariant, and assert contracts are
 *    expressed. These are properties of static semantics in the spec, see C0.23, "@requires and @ensures can
 *    only annotate functions," etc.
 *  - Arbitrary pragmas are accepted (this matches the actual behavior of the C0 compiler, which only warns on
 *    unknown pragmas)
 *
 * Loosely based on Esprima, with the notable and stubborn distinction of using "tag" instead of "type."
 * Esprima Spec: https://esprima.readthedocs.io/en/latest/syntax-tree-format.html
 * Esprima Demo: http://esprima.org/demo/parse.html
 */
export interface Syn {
    readonly tag: string;
    readonly range?: [number, number];
    readonly loc?: SourceLocation;
}
export interface Position {
    readonly line: number;
    readonly column: number;
}
export interface SourceLocation {
    readonly start: Position;
    readonly end: Position;
    readonly source?: string | null;
}
export interface Identifier extends Syn {
    readonly tag: "Identifier";
    readonly name: string;
}
export declare type Type = IntType | BoolType | StringType | CharType | VoidType | PointerType | ArrayType | StructType | Identifier;
export interface IntType extends Syn {
    readonly tag: "IntType";
}
export interface BoolType extends Syn {
    readonly tag: "BoolType";
}
export interface StringType extends Syn {
    readonly tag: "StringType";
}
export interface CharType extends Syn {
    readonly tag: "CharType";
}
export interface VoidType extends Syn {
    readonly tag: "VoidType";
}
export interface PointerType extends Syn {
    readonly tag: "PointerType";
    readonly argument: Type;
}
export interface ArrayType extends Syn {
    readonly tag: "ArrayType";
    readonly argument: Type;
}
export interface StructType extends Syn {
    readonly tag: "StructType";
    readonly id: Identifier;
}
export declare type Expression = Identifier | IntLiteral | StringLiteral | CharLiteral | BoolLiteral | NullLiteral | ArrayMemberExpression | StructMemberExpression | CallExpression | IndirectCallExpression | CastExpression | UnaryExpression | BinaryExpression | LogicalExpression | ConditionalExpression | AllocExpression | AllocArrayExpression | ResultExpression | LengthExpression | HasTagExpression;
export interface IntLiteral extends Syn {
    readonly tag: "IntLiteral";
    readonly value: number;
    readonly raw: string;
}
export interface StringLiteral extends Syn {
    readonly tag: "StringLiteral";
    readonly value: string;
    readonly raw: string;
}
export interface CharLiteral extends Syn {
    readonly tag: "CharLiteral";
    readonly value: string;
    readonly raw: string;
}
export interface BoolLiteral extends Syn {
    readonly tag: "BoolLiteral";
    readonly value: boolean;
}
export interface NullLiteral extends Syn {
    readonly tag: "NullLiteral";
}
/**
 * Array access `e[e]`
 */
export interface ArrayMemberExpression extends Syn {
    readonly tag: "ArrayMemberExpression";
    readonly object: Expression;
    readonly index: Expression;
}
/**
 * Struct field access:
 *  - `e.f` (deref === false)
 *  - `e->f` (deref === true)
 */
export interface StructMemberExpression extends Syn {
    readonly tag: "StructMemberExpression";
    readonly deref: boolean;
    readonly object: Expression;
    readonly field: Identifier;
}
/**
 * Regular function calls `f(e1,e2,...,en)`
 */
export interface CallExpression extends Syn {
    readonly tag: "CallExpression";
    readonly callee: Identifier;
    readonly arguments: Expression[];
}
/**
 * Function pointer calls `(*e)(e1,e2,...,en)`
 */
export interface IndirectCallExpression extends Syn {
    readonly tag: "IndirectCallExpression";
    readonly callee: Expression;
    readonly arguments: Expression[];
}
/**
 * Prefix cast operation `(ty)e`.
 */
export interface CastExpression extends Syn {
    readonly tag: "CastExpression";
    readonly kind: Type;
    readonly argument: Expression;
}
/**
 * Prefix unary operations `~e` and friends.
 */
export interface UnaryExpression extends Syn {
    readonly tag: "UnaryExpression";
    readonly operator: "&" | "!" | "~" | "-" | "*";
    readonly argument: Expression;
}
/**
 * Eager binary operations `e+e` and friends
 */
export interface BinaryExpression extends Syn {
    readonly tag: "BinaryExpression";
    readonly operator: "*" | "/" | "%" | "+" | "-" | "<<" | ">>" | "<" | "<=" | ">=" | ">" | "==" | "!=" | "&" | "^" | "|";
    readonly left: Expression;
    readonly right: Expression;
}
/**
 * Short-circuiting binary operations `e && e` and `e || e`.
 */
export interface LogicalExpression extends Syn {
    readonly tag: "LogicalExpression";
    readonly operator: "||" | "&&";
    readonly left: Expression;
    readonly right: Expression;
}
/**
 * `e ? e : e`
 */
export interface ConditionalExpression extends Syn {
    readonly tag: "ConditionalExpression";
    readonly test: Expression;
    readonly consequent: Expression;
    readonly alternate: Expression;
}
/**
 * `alloc(ty)`
 */
export interface AllocExpression extends Syn {
    readonly tag: "AllocExpression";
    readonly kind: Type;
}
/**
 * `alloc(ty)`
 */
export interface AllocArrayExpression extends Syn {
    readonly tag: "AllocArrayExpression";
    readonly kind: Type;
    readonly size: Expression;
}
/**
 * `\result`
 */
export interface ResultExpression extends Syn {
    readonly tag: "ResultExpression";
}
/**
 * `\length(e)`
 */
export interface LengthExpression extends Syn {
    readonly tag: "LengthExpression";
    readonly argument: Expression;
}
/**
 * `\hastag(ty,e)`
 */
export interface HasTagExpression extends Syn {
    readonly tag: "HasTagExpression";
    readonly kind: Type;
    readonly argument: Expression;
}
/**
 * LValues are a refinement of Expressions
 */
export declare type LValue = Identifier | StructMemberLValue | DereferenceLValue | ArrayMemberLValue;
export interface StructMemberLValue extends StructMemberExpression {
    readonly object: LValue;
}
export interface DereferenceLValue extends UnaryExpression {
    readonly operator: "*";
    readonly argument: LValue;
}
export interface ArrayMemberLValue extends ArrayMemberExpression {
    readonly object: LValue;
}
export declare type SimpleStatement = AssignmentStatement | UpdateStatement | ExpressionStatement;
export declare type Statement = SimpleStatement | VariableDeclaration | IfStatement | WhileStatement | ForStatement | ReturnStatement | BlockStatement | AssertStatement | ErrorStatement | BreakStatement | ContinueStatement;
export interface AssignmentStatement extends Syn {
    readonly tag: "AssignmentStatement";
    readonly operator: "=" | "+=" | "-=" | "*=" | "/=" | "%=" | "<<=" | ">>=" | "&=" | "^=" | "|=";
    readonly left: LValue;
    readonly right: Expression;
}
export interface UpdateStatement extends Syn {
    readonly tag: "UpdateStatement";
    readonly operator: "++" | "--";
    readonly argument: Expression;
}
export interface ExpressionStatement extends Syn {
    readonly tag: "ExpressionStatement";
    readonly expression: Expression;
}
export interface VariableDeclaration extends Syn {
    readonly tag: "VariableDeclaration";
    readonly kind: Type;
    readonly id: Identifier;
    readonly init: Expression | null;
}
export interface IfStatement extends Syn {
    readonly tag: "IfStatement";
    readonly test: Expression;
    readonly consequent: Statement;
    readonly alternate?: Statement;
}
export interface WhileStatement extends Syn {
    readonly tag: "WhileStatement";
    readonly invariants: Expression[];
    readonly test: Expression;
    readonly body: Statement;
}
export interface ForStatement extends Syn {
    readonly tag: "ForStatement";
    readonly invariants: Expression[];
    readonly init: SimpleStatement | VariableDeclaration | null;
    readonly test: Expression;
    readonly update: SimpleStatement | null;
    readonly body: Statement;
}
export interface ReturnStatement extends Syn {
    readonly tag: "ReturnStatement";
    readonly argument: Expression | null;
}
export interface BlockStatement extends Syn {
    readonly tag: "BlockStatement";
    readonly body: Statement[];
}
export interface AssertStatement extends Syn {
    readonly tag: "AssertStatement";
    readonly contract: boolean;
    readonly test: Expression;
}
export interface ErrorStatement extends Syn {
    readonly tag: "ErrorStatement";
    readonly argument: Expression;
}
export interface BreakStatement extends Syn {
    readonly tag: "BreakStatement";
}
export interface ContinueStatement extends Syn {
    readonly tag: "ContinueStatement";
}
export declare type Declaration = StructDeclaration | FunctionDeclaration | TypeDefinition | FunctionTypeDefinition | Pragma;
export interface StructDeclaration {
    readonly tag: "StructDeclaration";
    readonly id: Identifier;
    readonly definitions: VariableDeclarationOnly[];
}
export interface VariableDeclarationOnly extends Syn {
    readonly kind: Type;
    readonly id: Identifier;
}
export interface FunctionDeclaration {
    readonly tag: "FunctionDeclaration";
    readonly returns: Type;
    readonly id: Identifier;
    readonly params: VariableDeclarationOnly[];
    readonly preconditions: Expression[];
    readonly postconditions: Expression[];
    readonly body: null | BlockStatement;
}
export interface TypeDefinition {
    readonly tag: "TypeDefinition";
    readonly definition: VariableDeclarationOnly;
}
export interface FunctionTypeDefinition {
    readonly tag: "FunctionTypeDefinition";
    readonly definition: FunctionDeclaration;
}
export interface Pragma {
    readonly tag: "Pragma";
    readonly pragma: string;
    readonly contents: string;
}