ember-legacy-class-transform
Version:
The default blueprint for ember-cli addons.
198 lines • 5.9 kB
JavaScript
import * as HBS from '../types/nodes';
function unreachable() {
throw new Error('unreachable');
}
export default function build(ast) {
if (!ast) {
return '';
}
const output = [];
switch (ast.type) {
case 'Program':
{
const chainBlock = ast['chained'] && ast.body[0];
if (chainBlock) {
chainBlock['chained'] = true;
}
const body = buildEach(ast.body).join('');
output.push(body);
}
break;
case 'ElementNode':
output.push('<', ast.tag);
if (ast.attributes.length) {
output.push(' ', buildEach(ast.attributes).join(' '));
}
if (ast.modifiers.length) {
output.push(' ', buildEach(ast.modifiers).join(' '));
}
if (ast.comments.length) {
output.push(' ', buildEach(ast.comments).join(' '));
}
output.push('>');
output.push.apply(output, buildEach(ast.children));
output.push('</', ast.tag, '>');
break;
case 'AttrNode':
output.push(ast.name, '=');
const value = build(ast.value);
if (ast.value.type === 'TextNode') {
output.push('"', value, '"');
} else {
output.push(value);
}
break;
case 'ConcatStatement':
output.push('"');
ast.parts.forEach(node => {
if (node.type === 'StringLiteral') {
output.push(node.original);
} else {
output.push(build(node));
}
});
output.push('"');
break;
case 'TextNode':
output.push(ast.chars);
break;
case 'MustacheStatement':
{
output.push(compactJoin(['{{', pathParams(ast), '}}']));
}
break;
case 'MustacheCommentStatement':
{
output.push(compactJoin(['{{!--', ast.value, '--}}']));
}
break;
case 'ElementModifierStatement':
{
output.push(compactJoin(['{{', pathParams(ast), '}}']));
}
break;
case 'PathExpression':
output.push(ast.original);
break;
case 'SubExpression':
{
output.push('(', pathParams(ast), ')');
}
break;
case 'BooleanLiteral':
output.push(ast.value ? 'true' : 'false');
break;
case 'BlockStatement':
{
const lines = [];
if (ast['chained']) {
lines.push(['{{else ', pathParams(ast), '}}'].join(''));
} else {
lines.push(openBlock(ast));
}
lines.push(build(ast.program));
if (ast.inverse) {
if (!ast.inverse['chained']) {
lines.push('{{else}}');
}
lines.push(build(ast.inverse));
}
if (!ast['chained']) {
lines.push(closeBlock(ast));
}
output.push(lines.join(''));
}
break;
case 'PartialStatement':
{
output.push(compactJoin(['{{>', pathParams(ast), '}}']));
}
break;
case 'CommentStatement':
{
output.push(compactJoin(['<!--', ast.value, '-->']));
}
break;
case 'StringLiteral':
{
output.push(`"${ast.value}"`);
}
break;
case 'NumberLiteral':
{
output.push(String(ast.value));
}
break;
case 'UndefinedLiteral':
{
output.push('undefined');
}
break;
case 'NullLiteral':
{
output.push('null');
}
break;
case 'Hash':
{
output.push(ast.pairs.map(pair => {
return build(pair);
}).join(' '));
}
break;
case 'HashPair':
{
output.push(`${ast.key}=${build(ast.value)}`);
}
break;
}
return output.join('');
}
function compact(array) {
const newArray = [];
array.forEach(a => {
if (typeof a !== 'undefined' && a !== null && a !== '') {
newArray.push(a);
}
});
return newArray;
}
function buildEach(asts) {
return asts.map(build);
}
function pathParams(ast) {
let path;
switch (ast.type) {
case 'MustacheStatement':
case 'SubExpression':
case 'ElementModifierStatement':
case 'BlockStatement':
if (HBS.isLiteral(ast.path)) {
return String(ast.path.value);
}
path = build(ast.path);
break;
case 'PartialStatement':
path = build(ast.name);
break;
default:
return unreachable();
}
return compactJoin([path, buildEach(ast.params).join(' '), build(ast.hash)], ' ');
}
function compactJoin(array, delimiter) {
return compact(array).join(delimiter || '');
}
function blockParams(block) {
const params = block.program.blockParams;
if (params.length) {
return ` as |${params.join(' ')}|`;
}
return null;
}
function openBlock(block) {
return ['{{#', pathParams(block), blockParams(block), '}}'].join('');
}
function closeBlock(block) {
return ['{{/', build(block.path), '}}'].join('');
}