mirror of
https://github.com/odoo/owl.git
synced 2025-10-06 19:59:41 +07:00
Bruno Boi
895 lines
24 KiB
TypeScript
895 lines
24 KiB
TypeScript
// -----------------------------------------------------------------------------
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// AST Type definition
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// -----------------------------------------------------------------------------
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export const enum ASTType {
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Text,
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Comment,
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DomNode,
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Multi,
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TEsc,
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TIf,
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TSet,
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TCall,
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TRaw,
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TForEach,
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TKey,
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TComponent,
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TDebug,
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TLog,
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TSlot,
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TCallBlock,
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TTranslation,
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}
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export interface ASTText {
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type: ASTType.Text;
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value: string;
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}
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export interface ASTComment {
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type: ASTType.Comment;
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value: string;
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}
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export interface ASTDomNode {
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type: ASTType.DomNode;
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tag: string;
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attrs: { [key: string]: string };
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content: AST[];
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ref: string | null;
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on: { [key: string]: string };
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model: {
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baseExpr: string;
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expr: string;
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targetAttr: string;
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specialInitTargetAttr: string | null;
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eventType: "change" | "click" | "input";
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shouldTrim: boolean;
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shouldNumberize: boolean;
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} | null;
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}
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export interface ASTMulti {
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type: ASTType.Multi;
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content: AST[];
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}
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export interface ASTTEsc {
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type: ASTType.TEsc;
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expr: string;
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defaultValue: string;
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}
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export interface ASTTRaw {
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type: ASTType.TRaw;
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expr: string;
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body: AST[] | null;
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}
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export interface ASTTif {
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type: ASTType.TIf;
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condition: string;
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content: AST;
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tElif: { condition: string; content: AST }[] | null;
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tElse: AST | null;
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}
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export interface ASTTSet {
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type: ASTType.TSet;
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name: string;
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value: string | null; // value defined in attribute
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defaultValue: string | null; // value defined in body, if text
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body: AST[] | null; // content of body if not text
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}
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export interface ASTTForEach {
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type: ASTType.TForEach;
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collection: string;
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elem: string;
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key: string | null;
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body: AST;
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memo: string;
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isOnlyChild: boolean;
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hasNoComponent: boolean;
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hasNoFirst: boolean;
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hasNoLast: boolean;
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hasNoIndex: boolean;
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hasNoValue: boolean;
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}
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export interface ASTTKey {
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type: ASTType.TKey;
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expr: string;
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content: AST;
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}
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export interface ASTTCall {
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type: ASTType.TCall;
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name: string;
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body: AST[] | null;
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}
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export interface ASTComponent {
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type: ASTType.TComponent;
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name: string;
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isDynamic: boolean;
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dynamicProps: string | null;
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props: { [name: string]: string };
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slots: { [name: string]: AST };
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}
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export interface ASTSlot {
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type: ASTType.TSlot;
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name: string;
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defaultContent: AST | null;
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}
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export interface ASTTCallBlock {
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type: ASTType.TCallBlock;
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name: string;
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}
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export interface ASTDebug {
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type: ASTType.TDebug;
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content: AST | null;
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}
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export interface ASTLog {
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type: ASTType.TLog;
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expr: string;
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content: AST | null;
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}
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export interface ASTTranslation {
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type: ASTType.TTranslation;
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content: AST | null;
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}
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export type AST =
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| ASTText
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| ASTComment
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| ASTDomNode
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| ASTMulti
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| ASTTEsc
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| ASTTif
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| ASTTSet
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| ASTTCall
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| ASTTRaw
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| ASTTForEach
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| ASTTKey
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| ASTComponent
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| ASTSlot
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| ASTTCallBlock
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| ASTLog
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| ASTDebug
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| ASTTranslation;
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// -----------------------------------------------------------------------------
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// Parser
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// -----------------------------------------------------------------------------
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interface ParsingContext {
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inPreTag: boolean;
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}
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export function parse(xml: string): AST {
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const template = `<t>${xml}</t>`;
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const doc = parseXML(template);
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const ctx = { inPreTag: false };
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const ast = parseNode(doc.firstChild!, ctx);
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if (!ast) {
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return { type: ASTType.Text, value: "" };
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}
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return ast;
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}
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function parseNode(node: ChildNode, ctx: ParsingContext): AST | null {
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if (!(node instanceof Element)) {
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return parseTextCommentNode(node, ctx);
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}
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return (
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parseTDebugLog(node, ctx) ||
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parseTForEach(node, ctx) ||
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parseTIf(node, ctx) ||
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parseTCall(node, ctx) ||
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parseTCallBlock(node, ctx) ||
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parseTEscNode(node, ctx) ||
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parseTKey(node, ctx) ||
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parseTTranslation(node, ctx) ||
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parseTSlot(node, ctx) ||
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parseTRawNode(node, ctx) ||
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parseComponent(node, ctx) ||
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parseDOMNode(node, ctx) ||
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parseTSetNode(node, ctx) ||
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parseTNode(node, ctx)
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);
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}
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// -----------------------------------------------------------------------------
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// <t /> tag
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// -----------------------------------------------------------------------------
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function parseTNode(node: Element, ctx: ParsingContext): AST | null {
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if (node.tagName !== "t") {
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return null;
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}
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const children: AST[] = [];
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for (let child of node.childNodes) {
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const ast = parseNode(child, ctx);
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if (ast) {
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children.push(ast);
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}
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}
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switch (children.length) {
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case 0:
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return null;
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case 1:
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return children[0];
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default:
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return {
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type: ASTType.Multi,
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content: children,
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};
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}
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}
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// -----------------------------------------------------------------------------
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// Text and Comment Nodes
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// -----------------------------------------------------------------------------
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const lineBreakRE = /[\r\n]/;
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const whitespaceRE = /\s+/g;
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function parseTextCommentNode(node: ChildNode, ctx: ParsingContext): AST | null {
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if (node.nodeType === 3) {
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let value = node.textContent || "";
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if (!ctx.inPreTag) {
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if (lineBreakRE.test(value) && !value.trim()) {
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return null;
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}
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value = value.replace(whitespaceRE, " ");
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}
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return { type: ASTType.Text, value };
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} else if (node.nodeType === 8) {
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return { type: ASTType.Comment, value: node.textContent || "" };
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}
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return null;
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}
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// -----------------------------------------------------------------------------
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// debugging
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// -----------------------------------------------------------------------------
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function parseTDebugLog(node: Element, ctx: ParsingContext): AST | null {
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if (node.hasAttribute("t-debug")) {
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node.removeAttribute("t-debug");
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return {
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type: ASTType.TDebug,
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content: parseNode(node, ctx),
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};
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}
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if (node.hasAttribute("t-log")) {
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const expr = node.getAttribute("t-log")!;
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node.removeAttribute("t-log");
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return {
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type: ASTType.TLog,
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expr,
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content: parseNode(node, ctx),
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};
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}
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return null;
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}
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// -----------------------------------------------------------------------------
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// Regular dom node
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// -----------------------------------------------------------------------------
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const hasDotAtTheEnd = /\.[\w_]+\s*$/;
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const hasBracketsAtTheEnd = /\[[^\[]+\]\s*$/;
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function parseDOMNode(node: Element, ctx: ParsingContext): AST | null {
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const { tagName } = node;
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if (tagName === "t") {
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return null;
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}
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const children: AST[] = [];
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if (tagName === "pre") {
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ctx = { inPreTag: true };
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}
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let ref = null;
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if (node.hasAttribute("t-ref")) {
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ref = node.getAttribute("t-ref");
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node.removeAttribute("t-ref");
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}
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for (let child of node.childNodes) {
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const ast = parseNode(child, ctx);
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if (ast) {
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children.push(ast);
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}
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}
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const nodeAttrsNames = node.getAttributeNames();
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const attrs: ASTDomNode["attrs"] = {};
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const on: ASTDomNode["on"] = {};
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let model: ASTDomNode["model"] = null;
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for (let attr of nodeAttrsNames) {
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const value = node.getAttribute(attr)!;
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if (attr.startsWith("t-on")) {
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if (attr === "t-on") {
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throw new Error("Missing event name with t-on directive");
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}
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on[attr.slice(5)] = value;
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} else if (attr.startsWith("t-model")) {
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if (!["input", "select", "textarea"].includes(tagName)) {
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throw new Error("The t-model directive only works with <input>, <textarea> and <select>");
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}
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let baseExpr, expr;
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if (hasDotAtTheEnd.test(value)) {
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const index = value.lastIndexOf(".");
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baseExpr = value.slice(0, index);
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expr = `'${value.slice(index + 1)}'`;
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} else if (hasBracketsAtTheEnd.test(value)) {
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const index = value.lastIndexOf("[");
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baseExpr = value.slice(0, index);
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expr = value.slice(index + 1, -1);
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} else {
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throw new Error(`Invalid t-model expression: "${value}" (it should be assignable)`);
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}
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const typeAttr = node.getAttribute("type");
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const isInput = tagName === "input";
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const isSelect = tagName === "select";
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const isTextarea = tagName === "textarea";
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const isCheckboxInput = isInput && typeAttr === "checkbox";
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const isRadioInput = isInput && typeAttr === "radio";
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const isOtherInput = isInput && !isCheckboxInput && !isRadioInput;
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const hasLazyMod = attr.includes(".lazy");
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const hasNumberMod = attr.includes(".number");
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const hasTrimMod = attr.includes(".trim");
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const eventType = isRadioInput ? "click" : isSelect || hasLazyMod ? "change" : "input";
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const similarTOnEvent = nodeAttrsNames.find((a) => a.startsWith(`t-on-${eventType}`));
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if (similarTOnEvent) {
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throw new Error(
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`Conflicting t-model and ${similarTOnEvent} directives on event type: ${eventType}`
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);
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}
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model = {
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baseExpr,
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expr,
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targetAttr: isCheckboxInput ? "checked" : "value",
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specialInitTargetAttr: isRadioInput ? "checked" : null,
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eventType,
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shouldTrim: hasTrimMod && (isOtherInput || isTextarea),
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shouldNumberize: hasNumberMod && (isOtherInput || isTextarea),
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};
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} else {
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if (attr.startsWith("t-") && !attr.startsWith("t-att")) {
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throw new Error(`Unknown QWeb directive: '${attr}'`);
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}
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attrs[attr] = value;
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}
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}
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if (children.length === 1 && children[0].type === ASTType.TForEach) {
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children[0].isOnlyChild = true;
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}
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return {
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type: ASTType.DomNode,
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tag: tagName,
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attrs,
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on,
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ref,
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content: children,
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model,
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};
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}
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// -----------------------------------------------------------------------------
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// t-esc
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// -----------------------------------------------------------------------------
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function parseTEscNode(node: Element, ctx: ParsingContext): AST | null {
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if (!node.hasAttribute("t-esc")) {
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return null;
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}
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const escValue = node.getAttribute("t-esc")!;
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node.removeAttribute("t-esc");
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const tesc: AST = {
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type: ASTType.TEsc,
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expr: escValue,
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defaultValue: node.textContent || "",
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};
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let ref = node.getAttribute("t-ref");
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node.removeAttribute("t-ref");
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const ast = parseNode(node, ctx);
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if (!ast) {
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return tesc;
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}
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if (ast && ast.type === ASTType.DomNode) {
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return {
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type: ASTType.DomNode,
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tag: ast.tag,
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attrs: ast.attrs,
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on: ast.on,
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ref,
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content: [tesc],
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model: ast.model,
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};
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}
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if (ast && ast.type === ASTType.TComponent) {
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return {
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...ast,
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slots: { default: tesc },
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};
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}
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return tesc;
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}
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// -----------------------------------------------------------------------------
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// t-raw
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// -----------------------------------------------------------------------------
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function parseTRawNode(node: Element, ctx: ParsingContext): AST | null {
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if (!node.hasAttribute("t-raw")) {
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return null;
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}
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const expr = node.getAttribute("t-raw")!;
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node.removeAttribute("t-raw");
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const tRaw: AST = { type: ASTType.TRaw, expr, body: null };
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const ref = node.getAttribute("t-ref");
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node.removeAttribute("t-ref");
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const ast = parseNode(node, ctx);
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if (!ast) {
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return tRaw;
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}
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if (ast && ast.type === ASTType.DomNode) {
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tRaw.body = ast.content.length ? ast.content : null;
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return {
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type: ASTType.DomNode,
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tag: ast.tag,
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attrs: ast.attrs,
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on: ast.on,
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ref,
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content: [tRaw],
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model: ast.model,
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};
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}
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return tRaw;
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}
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// -----------------------------------------------------------------------------
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// t-foreach and t-key
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// -----------------------------------------------------------------------------
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function parseTForEach(node: Element, ctx: ParsingContext): AST | null {
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if (!node.hasAttribute("t-foreach")) {
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return null;
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}
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const html = node.outerHTML;
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const collection = node.getAttribute("t-foreach")!;
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node.removeAttribute("t-foreach");
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const elem = node.getAttribute("t-as") || "";
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node.removeAttribute("t-as");
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const key = node.getAttribute("t-key");
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if (!key) {
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throw new Error(
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`"Directive t-foreach should always be used with a t-key!" (expression: t-foreach="${collection}" t-as="${elem}")`
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);
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}
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node.removeAttribute("t-key");
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const memo = node.getAttribute("t-memo") || "";
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node.removeAttribute("t-memo");
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const body = parseNode(node, ctx);
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if (!body) {
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return null;
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}
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const hasNoTCall = !html.includes("t-call");
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const hasNoFirst = hasNoTCall && !html.includes(`${elem}_first`);
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const hasNoLast = hasNoTCall && !html.includes(`${elem}_last`);
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const hasNoIndex = hasNoTCall && !html.includes(`${elem}_index`);
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const hasNoValue = hasNoTCall && !html.includes(`${elem}_value`);
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return {
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type: ASTType.TForEach,
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collection,
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elem,
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body,
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memo,
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key,
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isOnlyChild: false,
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hasNoComponent: hasNoComponent(body),
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hasNoFirst,
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hasNoLast,
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hasNoIndex,
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hasNoValue,
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};
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}
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|
|
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/**
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* @returns true if we are sure the ast does not contain any component
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*/
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function hasNoComponent(ast: AST): boolean {
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switch (ast.type) {
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case ASTType.TComponent:
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case ASTType.TRaw:
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case ASTType.TCall:
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case ASTType.TCallBlock:
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case ASTType.TSlot:
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return false;
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case ASTType.TSet:
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case ASTType.Text:
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case ASTType.Comment:
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case ASTType.TEsc:
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return true;
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case ASTType.TKey:
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return hasNoComponent(ast.content);
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case ASTType.TDebug:
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case ASTType.TLog:
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case ASTType.TTranslation:
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return ast.content ? hasNoComponent(ast.content) : true;
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case ASTType.TForEach:
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return ast.hasNoComponent;
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case ASTType.Multi:
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case ASTType.DomNode: {
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for (let elem of ast.content) {
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if (!hasNoComponent(elem)) {
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return false;
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}
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}
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return true;
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}
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case ASTType.TIf: {
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if (!hasNoComponent(ast.content)) {
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return false;
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}
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if (ast.tElif) {
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for (let elem of ast.tElif) {
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if (!hasNoComponent(elem.content)) {
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return false;
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}
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}
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}
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if (ast.tElse && !hasNoComponent(ast.tElse)) {
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return false;
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}
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return true;
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}
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}
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}
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|
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function parseTKey(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-key")) {
|
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return null;
|
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}
|
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const key = node.getAttribute("t-key")!;
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node.removeAttribute("t-key");
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const body = parseNode(node, ctx);
|
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if (!body) {
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return null;
|
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}
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return { type: ASTType.TKey, expr: key, content: body };
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}
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// -----------------------------------------------------------------------------
|
|
// t-call
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseTCall(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-call")) {
|
|
return null;
|
|
}
|
|
const subTemplate = node.getAttribute("t-call")!;
|
|
|
|
node.removeAttribute("t-call");
|
|
if (node.tagName !== "t") {
|
|
const ast = parseNode(node, ctx);
|
|
const tcall: AST = { type: ASTType.TCall, name: subTemplate, body: null };
|
|
if (ast && ast.type === ASTType.DomNode) {
|
|
ast.content = [tcall];
|
|
return ast;
|
|
}
|
|
if (ast && ast.type === ASTType.TComponent) {
|
|
return {
|
|
...ast,
|
|
slots: { default: tcall },
|
|
};
|
|
}
|
|
}
|
|
const body: AST[] = [];
|
|
for (let child of node.childNodes) {
|
|
const ast = parseNode(child, ctx);
|
|
if (ast) {
|
|
body.push(ast);
|
|
}
|
|
}
|
|
|
|
return {
|
|
type: ASTType.TCall,
|
|
name: subTemplate,
|
|
body: body.length ? body : null,
|
|
};
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// t-call-block
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseTCallBlock(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-call-block")) {
|
|
return null;
|
|
}
|
|
const name = node.getAttribute("t-call-block")!;
|
|
return {
|
|
type: ASTType.TCallBlock,
|
|
name,
|
|
};
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// t-if
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseTIf(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-if")) {
|
|
return null;
|
|
}
|
|
const condition = node.getAttribute("t-if")!;
|
|
node.removeAttribute("t-if");
|
|
const content = parseNode(node, ctx);
|
|
if (!content) {
|
|
throw new Error("hmmm");
|
|
}
|
|
|
|
let nextElement = node.nextElementSibling;
|
|
// t-elifs
|
|
const tElifs: any[] = [];
|
|
while (nextElement && nextElement.hasAttribute("t-elif")) {
|
|
const condition = nextElement.getAttribute("t-elif");
|
|
nextElement.removeAttribute("t-elif");
|
|
const tElif = parseNode(nextElement, ctx);
|
|
const next = nextElement.nextElementSibling;
|
|
nextElement.remove();
|
|
nextElement = next;
|
|
if (tElif) {
|
|
tElifs.push({ condition, content: tElif });
|
|
}
|
|
}
|
|
|
|
// t-else
|
|
let tElse: AST | null = null;
|
|
if (nextElement && nextElement.hasAttribute("t-else")) {
|
|
nextElement.removeAttribute("t-else");
|
|
tElse = parseNode(nextElement, ctx);
|
|
nextElement.remove();
|
|
}
|
|
|
|
return {
|
|
type: ASTType.TIf,
|
|
condition,
|
|
content,
|
|
tElif: tElifs.length ? tElifs : null,
|
|
tElse,
|
|
};
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// t-set directive
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseTSetNode(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-set")) {
|
|
return null;
|
|
}
|
|
const name = node.getAttribute("t-set")!;
|
|
const value = node.getAttribute("t-value") || null;
|
|
const defaultValue = node.innerHTML === node.textContent ? node.textContent || null : null;
|
|
let body: AST[] | null = null;
|
|
if (node.textContent !== node.innerHTML) {
|
|
body = [];
|
|
for (let child of node.childNodes) {
|
|
let childAst = parseNode(child, ctx);
|
|
if (childAst) {
|
|
body.push(childAst);
|
|
}
|
|
}
|
|
}
|
|
return { type: ASTType.TSet, name, value, defaultValue, body };
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Components
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseComponent(node: Element, ctx: ParsingContext): AST | null {
|
|
let name = node.tagName;
|
|
const firstLetter = name[0];
|
|
let isDynamic = node.hasAttribute("t-component");
|
|
|
|
if (isDynamic && name !== "t") {
|
|
throw new Error(`Directive 't-component' can only be used on <t> nodes (used on a <${name}>)`);
|
|
}
|
|
|
|
if (!(firstLetter === firstLetter.toUpperCase() || isDynamic)) {
|
|
return null;
|
|
}
|
|
if (isDynamic) {
|
|
name = node.getAttribute("t-component")!;
|
|
node.removeAttribute("t-component");
|
|
}
|
|
|
|
const dynamicProps = node.getAttribute("t-props");
|
|
node.removeAttribute("t-props");
|
|
|
|
const props: ASTComponent["props"] = {};
|
|
for (let name of node.getAttributeNames()) {
|
|
const value = node.getAttribute(name)!;
|
|
if (name.startsWith("t-on-")) {
|
|
throw new Error(
|
|
"t-on is no longer supported on Component node. Consider passing a callback in props."
|
|
);
|
|
} else {
|
|
props[name] = value;
|
|
}
|
|
}
|
|
|
|
const slots: ASTComponent["slots"] = {};
|
|
if (node.hasChildNodes()) {
|
|
const clone = <Element>node.cloneNode(true);
|
|
|
|
// named slots
|
|
const slotNodes = Array.from(clone.querySelectorAll("[t-set-slot]"));
|
|
for (let slotNode of slotNodes) {
|
|
const name = slotNode.getAttribute("t-set-slot")!;
|
|
|
|
// check if this is defined in a sub component (in which case it should
|
|
// be ignored)
|
|
let el = slotNode.parentElement!;
|
|
let isInSubComponent = false;
|
|
while (el !== clone) {
|
|
if (el!.hasAttribute("t-component") || el!.tagName[0] === el!.tagName[0].toUpperCase()) {
|
|
isInSubComponent = true;
|
|
break;
|
|
}
|
|
el = el.parentElement!;
|
|
}
|
|
if (isInSubComponent) {
|
|
continue;
|
|
}
|
|
|
|
slotNode.removeAttribute("t-set-slot");
|
|
slotNode.remove();
|
|
const slotAst = parseNode(slotNode, ctx);
|
|
if (slotAst) {
|
|
slots[name] = slotAst;
|
|
}
|
|
}
|
|
|
|
// default slot
|
|
const defaultContent = parseChildNodes(clone, ctx);
|
|
if (defaultContent) {
|
|
slots.default = defaultContent;
|
|
}
|
|
}
|
|
return { type: ASTType.TComponent, name, isDynamic, dynamicProps, props, slots };
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Slots
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseTSlot(node: Element, ctx: ParsingContext): AST | null {
|
|
if (!node.hasAttribute("t-slot")) {
|
|
return null;
|
|
}
|
|
return {
|
|
type: ASTType.TSlot,
|
|
name: node.getAttribute("t-slot")!,
|
|
defaultContent: parseChildNodes(node, ctx),
|
|
};
|
|
}
|
|
|
|
function parseTTranslation(node: Element, ctx: ParsingContext): AST | null {
|
|
if (node.getAttribute("t-translation") !== "off") {
|
|
return null;
|
|
}
|
|
node.removeAttribute("t-translation");
|
|
return {
|
|
type: ASTType.TTranslation,
|
|
content: parseNode(node, ctx),
|
|
};
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// helpers
|
|
// -----------------------------------------------------------------------------
|
|
|
|
function parseChildNodes(node: Element, ctx: ParsingContext): AST | null {
|
|
const children: AST[] = [];
|
|
for (let child of node.childNodes) {
|
|
const childAst = parseNode(child, ctx);
|
|
if (childAst) {
|
|
children.push(childAst);
|
|
}
|
|
}
|
|
switch (children.length) {
|
|
case 0:
|
|
return null;
|
|
case 1:
|
|
return children[0];
|
|
default:
|
|
return { type: ASTType.Multi, content: children };
|
|
}
|
|
}
|
|
function parseXML(xml: string): Document {
|
|
const parser = new DOMParser();
|
|
|
|
const doc = parser.parseFromString(xml, "text/xml");
|
|
if (doc.getElementsByTagName("parsererror").length) {
|
|
let msg = "Invalid XML in template.";
|
|
const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
|
|
if (parsererrorText) {
|
|
msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
|
|
const re = /\d+/g;
|
|
const firstMatch = re.exec(parsererrorText);
|
|
if (firstMatch) {
|
|
const lineNumber = Number(firstMatch[0]);
|
|
const line = xml.split("\n")[lineNumber - 1];
|
|
const secondMatch = re.exec(parsererrorText);
|
|
if (line && secondMatch) {
|
|
const columnIndex = Number(secondMatch[0]) - 1;
|
|
if (line[columnIndex]) {
|
|
msg +=
|
|
`\nThe error might be located at xml line ${lineNumber} column ${columnIndex}\n` +
|
|
`${line}\n${"-".repeat(columnIndex - 1)}^`;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
throw new Error(msg);
|
|
}
|
|
let tbranch = doc.querySelectorAll("[t-elif], [t-else]");
|
|
for (let i = 0, ilen = tbranch.length; i < ilen; i++) {
|
|
let node = tbranch[i];
|
|
let prevElem = node.previousElementSibling!;
|
|
let pattr = (name: string) => prevElem.getAttribute(name);
|
|
let nattr = (name: string) => +!!node.getAttribute(name);
|
|
if (prevElem && (pattr("t-if") || pattr("t-elif"))) {
|
|
if (pattr("t-foreach")) {
|
|
throw new Error(
|
|
"t-if cannot stay at the same level as t-foreach when using t-elif or t-else"
|
|
);
|
|
}
|
|
if (
|
|
["t-if", "t-elif", "t-else"].map(nattr).reduce(function (a, b) {
|
|
return a + b;
|
|
}) > 1
|
|
) {
|
|
throw new Error("Only one conditional branching directive is allowed per node");
|
|
}
|
|
// All text (with only spaces) and comment nodes (nodeType 8) between
|
|
// branch nodes are removed
|
|
let textNode;
|
|
while ((textNode = node.previousSibling) !== prevElem) {
|
|
if (textNode!.nodeValue!.trim().length && textNode!.nodeType !== 8) {
|
|
throw new Error("text is not allowed between branching directives");
|
|
}
|
|
textNode!.remove();
|
|
}
|
|
} else {
|
|
throw new Error(
|
|
"t-elif and t-else directives must be preceded by a t-if or t-elif directive"
|
|
);
|
|
}
|
|
}
|
|
|
|
return doc;
|
|
}
|