Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import read_expression from '../read/expression.js';
import { error } from '../../../errors.js';
import { create_fragment } from '../utils/create.js';
import { walk } from 'zimmerframe';
const regex_whitespace_with_closing_curly_brace = /^\s*}/;
/** @param {import('../index.js').Parser} parser */
export default function mustache(parser) {
const start = parser.index;
parser.index += 1;
parser.allow_whitespace();
if (parser.eat('#')) return open(parser);
if (parser.eat('/')) return close(parser);
if (parser.eat(':')) return next(parser);
if (parser.eat('@')) return special(parser);
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').ExpressionTag>>} */
parser.append({
type: 'ExpressionTag',
start,
end: parser.index,
expression,
metadata: {
contains_call_expression: false,
dynamic: false
}
});
}
/** @param {import('../index.js').Parser} parser */
function open(parser) {
const start = parser.index - 2;
if (parser.eat('if')) {
parser.require_whitespace();
/** @type {ReturnType<typeof parser.append<import('#compiler').IfBlock>>} */
const block = parser.append({
type: 'IfBlock',
elseif: false,
start,
end: -1,
test: read_expression(parser),
consequent: create_fragment(),
alternate: null
});
parser.allow_whitespace();
parser.eat('}', true);
parser.stack.push(block);
parser.fragments.push(block.consequent);
return;
}
if (parser.eat('each')) {
parser.require_whitespace();
const template = parser.template;
let end = parser.template.length;
/** @type {import('estree').Expression | undefined} */
let expression;
// we have to do this loop because `{#each x as { y = z }}` fails to parse —
// the `as { y = z }` is treated as an Expression but it's actually a Pattern.
// the 'fix' is to backtrack and hide everything from the `as` onwards, until
// we get a valid expression
while (!expression) {
try {
expression = read_expression(parser);
} catch (err) {
end = /** @type {any} */ (err).position[0] - 2;
while (end > start && parser.template.slice(end, end + 2) !== 'as') {
end -= 1;
}
if (end <= start) throw err;
// @ts-expect-error parser.template is meant to be readonly, this is a special case
parser.template = template.slice(0, end);
}
}
// @ts-expect-error
parser.template = template;
parser.allow_whitespace();
// {#each} blocks must declare a context – {#each list as item}
if (!parser.match('as')) {
// this could be a TypeScript assertion that was erroneously eaten.
if (expression.type === 'SequenceExpression') {
expression = expression.expressions[0];
}
let assertion = null;
let end = expression.end;
expression = walk(expression, null, {
// @ts-expect-error
TSAsExpression(node, context) {
if (node.end === /** @type {import('estree').Expression} */ (expression).end) {
assertion = node;
end = node.expression.end;
return node.expression;
}
context.next();
}
});
expression.end = end;
if (assertion) {
// we can't reset `parser.index` to `expression.expression.end` because
// it will ignore any parentheses — we need to jump through this hoop
let end = /** @type {any} */ (/** @type {any} */ (assertion).typeAnnotation).start - 2;
while (parser.template.slice(end, end + 2) !== 'as') end -= 1;
parser.index = end;
}
}
parser.eat('as', true);
parser.require_whitespace();
const context = read_pattern(parser);
parser.allow_whitespace();
let index;
let key;
if (parser.eat(',')) {
parser.allow_whitespace();
index = parser.read_identifier();
if (!index) {
error(parser.index, 'expected-identifier');
}
parser.allow_whitespace();
}
if (parser.eat('(')) {
parser.allow_whitespace();
key = read_expression(parser);
parser.allow_whitespace();
parser.eat(')', true);
parser.allow_whitespace();
}
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').EachBlock>>} */
const block = parser.append({
type: 'EachBlock',
start,
end: -1,
expression,
body: create_fragment(),
context,
index,
key,
metadata: /** @type {any} */ (null) // filled in later
});
parser.stack.push(block);
parser.fragments.push(block.body);
return;
}
if (parser.eat('await')) {
parser.require_whitespace();
const expression = read_expression(parser);
parser.allow_whitespace();
/** @type {ReturnType<typeof parser.append<import('#compiler').AwaitBlock>>} */
const block = parser.append({
type: 'AwaitBlock',
start,
end: -1,
expression,
value: null,
error: null,
pending: null,
then: null,
catch: null
});
if (parser.eat('then')) {
if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) {
parser.allow_whitespace();
} else {
parser.require_whitespace();
block.value = read_pattern(parser);
parser.allow_whitespace();
}
block.then = create_fragment();
parser.fragments.push(block.then);
} else if (parser.eat('catch')) {
if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) {
parser.allow_whitespace();
} else {
parser.require_whitespace();
block.error = read_pattern(parser);
parser.allow_whitespace();
}
block.catch = create_fragment();
parser.fragments.push(block.catch);
} else {
block.pending = create_fragment();
parser.fragments.push(block.pending);
}
parser.eat('}', true);
parser.stack.push(block);
return;
}
if (parser.eat('key')) {
parser.require_whitespace();
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').KeyBlock>>} */
const block = parser.append({
type: 'KeyBlock',
start,
end: -1,
expression,
fragment: create_fragment()
});
parser.stack.push(block);
parser.fragments.push(block.fragment);
return;
}
if (parser.eat('snippet')) {
parser.require_whitespace();
const name_start = parser.index;
const name = parser.read_identifier();
const name_end = parser.index;
if (name === null) {
error(parser.index, 'expected-identifier');
}
parser.eat('(', true);
parser.allow_whitespace();
/** @type {import('estree').Pattern[]} */
const parameters = [];
while (!parser.match(')')) {
let pattern = read_pattern(parser, true);
parser.allow_whitespace();
if (parser.eat('=')) {
parser.allow_whitespace();
pattern = {
type: 'AssignmentPattern',
left: pattern,
right: read_expression(parser)
};
}
parameters.push(pattern);
if (!parser.eat(',')) break;
parser.allow_whitespace();
}
parser.eat(')', true);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').SnippetBlock>>} */
const block = parser.append({
type: 'SnippetBlock',
start,
end: -1,
expression: {
type: 'Identifier',
start: name_start,
end: name_end,
name
},
parameters,
body: create_fragment()
});
parser.stack.push(block);
parser.fragments.push(block.body);
return;
}
error(parser.index, 'expected-block-type');
}
/** @param {import('../index.js').Parser} parser */
function next(parser) {
const start = parser.index - 1;
const block = parser.current(); // TODO type should not be TemplateNode, that's much too broad
if (block.type === 'IfBlock') {
if (!parser.eat('else')) error(start, 'expected-token', '{:else} or {:else if}');
if (parser.eat('if')) error(start, 'invalid-elseif');
parser.allow_whitespace();
parser.fragments.pop();
block.alternate = create_fragment();
parser.fragments.push(block.alternate);
// :else if
if (parser.eat('if')) {
parser.require_whitespace();
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').IfBlock>>} */
const child = parser.append({
start: parser.index,
end: -1,
type: 'IfBlock',
elseif: true,
test: expression,
consequent: create_fragment(),
alternate: null
});
parser.stack.push(child);
parser.fragments.pop();
parser.fragments.push(child.consequent);
} else {
// :else
parser.allow_whitespace();
parser.eat('}', true);
}
return;
}
if (block.type === 'EachBlock') {
if (!parser.eat('else')) error(start, 'expected-token', '{:else}');
parser.allow_whitespace();
parser.eat('}', true);
block.fallback = create_fragment();
parser.fragments.pop();
parser.fragments.push(block.fallback);
return;
}
if (block.type === 'AwaitBlock') {
if (parser.eat('then')) {
if (block.then) {
error(start, 'duplicate-block-part', '{:then}');
}
if (!parser.eat('}')) {
parser.require_whitespace();
block.value = read_pattern(parser);
parser.allow_whitespace();
parser.eat('}', true);
}
block.then = create_fragment();
parser.fragments.pop();
parser.fragments.push(block.then);
return;
}
if (parser.eat('catch')) {
if (block.catch) {
error(start, 'duplicate-block-part', '{:catch}');
}
if (!parser.eat('}')) {
parser.require_whitespace();
block.error = read_pattern(parser);
parser.allow_whitespace();
parser.eat('}', true);
}
block.catch = create_fragment();
parser.fragments.pop();
parser.fragments.push(block.catch);
return;
}
error(start, 'expected-token', '{:then ...} or {:catch ...}');
}
error(start, 'invalid-continuing-block-placement');
}
/** @param {import('../index.js').Parser} parser */
function close(parser) {
const start = parser.index - 1;
let block = parser.current();
switch (block.type) {
case 'IfBlock':
parser.eat('if', true);
parser.allow_whitespace();
parser.eat('}', true);
while (block.elseif) {
block.end = parser.index;
parser.stack.pop();
block = /** @type {import('#compiler').IfBlock} */ (parser.current());
}
block.end = parser.index;
parser.pop();
return;
case 'EachBlock':
parser.eat('each', true);
break;
case 'KeyBlock':
parser.eat('key', true);
break;
case 'AwaitBlock':
parser.eat('await', true);
break;
case 'SnippetBlock':
parser.eat('snippet', true);
break;
case 'RegularElement':
// TODO handle implicitly closed elements
error(start, 'unexpected-block-close');
break;
default:
error(start, 'unexpected-block-close');
}
parser.allow_whitespace();
parser.eat('}', true);
block.end = parser.index;
parser.pop();
}
/** @param {import('../index.js').Parser} parser */
function special(parser) {
let start = parser.index;
while (parser.template[start] !== '{') start -= 1;
if (parser.eat('html')) {
// {@html content} tag
parser.require_whitespace();
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').HtmlTag>>} */
parser.append({
type: 'HtmlTag',
start,
end: parser.index,
expression
});
return;
}
if (parser.eat('debug')) {
/** @type {import('estree').Identifier[]} */
let identifiers;
// Implies {@debug} which indicates "debug all"
if (parser.read(regex_whitespace_with_closing_curly_brace)) {
identifiers = [];
} else {
const expression = read_expression(parser);
identifiers =
expression.type === 'SequenceExpression'
? /** @type {import('estree').Identifier[]} */ (expression.expressions)
: [/** @type {import('estree').Identifier} */ (expression)];
identifiers.forEach(
/** @param {any} node */ (node) => {
if (node.type !== 'Identifier') {
error(/** @type {number} */ (node.start), 'invalid-debug');
}
}
);
parser.allow_whitespace();
parser.eat('}', true);
}
/** @type {ReturnType<typeof parser.append<import('#compiler').DebugTag>>} */
parser.append({
type: 'DebugTag',
start,
end: parser.index,
identifiers
});
return;
}
if (parser.eat('const')) {
parser.allow_whitespace();
const id = read_pattern(parser);
parser.allow_whitespace();
parser.eat('=', true);
parser.allow_whitespace();
const init = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').ConstTag>>} */
parser.append({
type: 'ConstTag',
start,
end: parser.index,
declaration: {
type: 'VariableDeclaration',
kind: 'const',
declarations: [{ type: 'VariableDeclarator', id, init }],
start: start + 2, // start at const, not at @const
end: parser.index - 1
}
});
}
if (parser.eat('render')) {
// {@render foo(...)}
parser.require_whitespace();
const expression = read_expression(parser);
if (
expression.type !== 'CallExpression' &&
(expression.type !== 'ChainExpression' ||
expression.expression.type !== 'CallExpression' ||
!expression.expression.optional)
) {
error(expression, 'invalid-render-expression');
}
parser.allow_whitespace();
parser.eat('}', true);
/** @type {ReturnType<typeof parser.append<import('#compiler').RenderTag>>} */
parser.append({
type: 'RenderTag',
start,
end: parser.index,
expression: expression
});
}
}
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