import type { Nullable, PresentArray } from '@glimmer/interfaces';
import type * as src from '../source/api';
export interface BaseNode {
    type: NodeType;
    loc: src.SourceSpan;
}
export interface CommonProgram extends BaseNode {
    body: Statement[];
}
export interface Block extends CommonProgram {
    type: 'Block';
    params: VarHead[];
    chained?: boolean;
    /**
     * string accessor for params.name
     */
    blockParams: string[];
}
export type EntityEncodingState = 'transformed' | 'raw';
export interface Template extends CommonProgram {
    type: 'Template';
    blockParams: string[];
}
/**
 * @deprecated use Template or Block instead
 */
export type Program = Template | Block;
export type CallableExpression = SubExpression | PathExpression;
export interface CallParts {
    path: CallableExpression;
    params: Expression[];
    hash: Hash;
    loc: src.SourceSpan;
}
export type CallNode = MustacheStatement | BlockStatement | ElementModifierStatement | SubExpression;
export interface MustacheStatement extends BaseNode {
    type: 'MustacheStatement';
    path: Expression;
    params: Expression[];
    hash: Hash;
    trusting: boolean;
    strip: StripFlags;
    /**
     * @deprecated use trusting instead
     */
    escaped: boolean;
}
export interface BlockStatement extends BaseNode {
    type: 'BlockStatement';
    path: CallableExpression;
    params: Expression[];
    hash: Hash;
    program: Block;
    inverse?: Nullable<Block>;
    openStrip: StripFlags;
    inverseStrip: StripFlags;
    closeStrip: StripFlags;
    chained?: boolean;
}
export interface ElementModifierStatement extends BaseNode {
    type: 'ElementModifierStatement';
    path: CallableExpression;
    params: Expression[];
    hash: Hash;
}
export interface CommentStatement extends BaseNode {
    type: 'CommentStatement';
    value: string;
}
export interface MustacheCommentStatement extends BaseNode {
    type: 'MustacheCommentStatement';
    value: string;
}
export interface ElementNode extends BaseNode {
    type: 'ElementNode';
    path: PathExpression;
    selfClosing: boolean;
    attributes: AttrNode[];
    params: VarHead[];
    modifiers: ElementModifierStatement[];
    comments: MustacheCommentStatement[];
    children: Statement[];
    /**
     * span for the open tag
     */
    openTag: src.SourceSpan;
    /**
     * span for the close tag, null for void or self-closing tags
     */
    closeTag: Nullable<src.SourceSpan>;
    /**
     * string accessor for path.original
     */
    tag: string;
    /**
     * string accessor for params.name
     */
    blockParams: string[];
}
export type StatementName = 'MustacheStatement' | 'CommentStatement' | 'BlockStatement' | 'MustacheCommentStatement' | 'TextNode' | 'ElementNode';
export interface AttrNode extends BaseNode {
    type: 'AttrNode';
    name: string;
    value: AttrValue;
}
export type AttrValue = TextNode | MustacheStatement | ConcatStatement;
export type AttrPart = TextNode | MustacheStatement;
export interface TextNode extends BaseNode {
    type: 'TextNode';
    chars: string;
}
export interface ConcatStatement extends BaseNode {
    type: 'ConcatStatement';
    parts: PresentArray<TextNode | MustacheStatement>;
}
export type ExpressionName = 'SubExpression' | 'PathExpression' | LiteralName;
export interface SubExpression extends BaseNode {
    type: 'SubExpression';
    path: CallableExpression;
    params: Expression[];
    hash: Hash;
}
export interface ThisHead {
    type: 'ThisHead';
    original: 'this';
    loc: src.SourceSpan;
}
export interface AtHead {
    type: 'AtHead';
    name: string;
    loc: src.SourceSpan;
    /**
     * alias for name
     */
    original: string;
}
export interface VarHead {
    type: 'VarHead';
    name: string;
    loc: src.SourceSpan;
    /**
     * alias for name
     */
    original: string;
}
export type PathHead = ThisHead | AtHead | VarHead;
export interface MinimalPathExpression extends BaseNode {
    type: 'PathExpression';
    head: PathHead;
    tail: string[];
}
export interface PathExpression extends MinimalPathExpression {
    type: 'PathExpression';
    original: string;
    head: PathHead;
    tail: string[];
    /**
     * @deprecated use `head` and `tail` instead
     */
    parts: readonly string[];
    /**
     * @deprecated use `head.type` instead
     */
    readonly this: boolean;
    /**
     * @deprecated use `head.type' instead
     */
    readonly data: boolean;
}
export type LiteralName = 'StringLiteral' | 'BooleanLiteral' | 'NumberLiteral' | 'UndefinedLiteral' | 'NullLiteral';
export interface StringLiteral extends BaseNode {
    type: 'StringLiteral';
    value: string;
    /**
     * @deprecated use value instead
     */
    original: string;
}
export interface BooleanLiteral extends BaseNode {
    type: 'BooleanLiteral';
    value: boolean;
    /**
     * @deprecated use value instead
     */
    original: boolean;
}
export interface NumberLiteral extends BaseNode {
    type: 'NumberLiteral';
    value: number;
    /**
     * @deprecated use value instead
     */
    original: number;
}
export interface UndefinedLiteral extends BaseNode {
    type: 'UndefinedLiteral';
    value: undefined;
    /**
     * @deprecated use value instead
     */
    original: undefined;
}
export interface NullLiteral extends BaseNode {
    type: 'NullLiteral';
    value: null;
    /**
     * @deprecated use value instead
     */
    original: null;
}
export interface Hash extends BaseNode {
    type: 'Hash';
    pairs: HashPair[];
}
export interface HashPair extends BaseNode {
    type: 'HashPair';
    key: string;
    value: Expression;
}
export interface StripFlags {
    open: boolean;
    close: boolean;
}
export type Nodes = {
    Template: Template;
    Block: Block;
    MustacheStatement: MustacheStatement;
    BlockStatement: BlockStatement;
    ElementModifierStatement: ElementModifierStatement;
    CommentStatement: CommentStatement;
    MustacheCommentStatement: MustacheCommentStatement;
    ElementNode: ElementNode;
    AttrNode: AttrNode;
    TextNode: TextNode;
    ConcatStatement: ConcatStatement;
    SubExpression: SubExpression;
    PathExpression: PathExpression;
    StringLiteral: StringLiteral;
    BooleanLiteral: BooleanLiteral;
    NumberLiteral: NumberLiteral;
    NullLiteral: NullLiteral;
    UndefinedLiteral: UndefinedLiteral;
    Hash: Hash;
    HashPair: HashPair;
};
export type NodeType = keyof Nodes;
export type Node = Nodes[NodeType];
export type SubNodes = {
    ThisHead: ThisHead;
    AtHead: AtHead;
    VarHead: VarHead;
};
export type SubNodeType = keyof SubNodes;
export type SubNode = SubNodes[SubNodeType];
export type Statement = Nodes[StatementName];
export type Statements = Pick<Nodes, StatementName>;
export type Literal = Nodes[LiteralName];
export type Expression = Nodes[ExpressionName];
export type Expressions = Pick<Nodes, ExpressionName>;
export type TopLevelStatement = Statement | Nodes['Block'];
export type ParentNode = Template | Block | ElementNode;