ember-legacy-class-transform
Version:
The default blueprint for ember-cli addons.
63 lines • 2.6 kB
JavaScript
import SyntaxError from './errors/syntax-error';
// Regex to validate the identifier for block parameters.
// Based on the ID validation regex in Handlebars.
let ID_INVERSE_PATTERN = /[!"#%-,\.\/;->@\[-\^`\{-~]/;
// Checks the element's attributes to see if it uses block params.
// If it does, registers the block params with the program and
// removes the corresponding attributes from the element.
export function parseElementBlockParams(element) {
let params = parseBlockParams(element);
if (params) element.blockParams = params;
}
function parseBlockParams(element) {
let l = element.attributes.length;
let attrNames = [];
for (let i = 0; i < l; i++) {
attrNames.push(element.attributes[i].name);
}
let asIndex = attrNames.indexOf('as');
if (asIndex !== -1 && l > asIndex && attrNames[asIndex + 1].charAt(0) === '|') {
// Some basic validation, since we're doing the parsing ourselves
let paramsString = attrNames.slice(asIndex).join(' ');
if (paramsString.charAt(paramsString.length - 1) !== '|' || paramsString.match(/\|/g).length !== 2) {
throw new SyntaxError('Invalid block parameters syntax: \'' + paramsString + '\'', element.loc);
}
let params = [];
for (let i = asIndex + 1; i < l; i++) {
let param = attrNames[i].replace(/\|/g, '');
if (param !== '') {
if (ID_INVERSE_PATTERN.test(param)) {
throw new SyntaxError('Invalid identifier for block parameters: \'' + param + '\' in \'' + paramsString + '\'', element.loc);
}
params.push(param);
}
}
if (params.length === 0) {
throw new SyntaxError('Cannot use zero block parameters: \'' + paramsString + '\'', element.loc);
}
element.attributes = element.attributes.slice(0, asIndex);
return params;
}
return null;
}
export function childrenFor(node) {
switch (node.type) {
case 'Program':
return node.body;
case 'ElementNode':
return node.children;
}
}
export function appendChild(parent, node) {
childrenFor(parent).push(node);
}
export function isLiteral(path) {
return path.type === 'StringLiteral' || path.type === 'BooleanLiteral' || path.type === 'NumberLiteral' || path.type === 'NullLiteral' || path.type === 'UndefinedLiteral';
}
export function printLiteral(literal) {
if (literal.type === 'UndefinedLiteral') {
return 'undefined';
} else {
return JSON.stringify(literal.value);
}
}