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whitespace.js
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whitespace.js
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import {visit} from '../visitor';
export function whitespace(ast) {
visit(ast, {
Document: (node) => {
trim(node, 'body');
},
Element: (node) => {
trim(node, 'body');
},
IfStatement: (node) => {
trim(node, 'then');
trim(node, 'otherwise');
},
ForStatement: (node) => {
trim(node, 'body');
},
BlockStatement: (node) => {
trim(node, 'body');
}
});
}
function trim(node, key) {
let skipped = false,
nodes = [];
if (!node[key]) {
return;
}
// Skip empty text nodes.
for (let i = 0; i < node[key].length; i++) {
if (node[key][i].type == 'Text') {
if (node[key][i].text.replace(/^\s+|\s+$/g, '') === '') {
skipped = true;
continue; // Skip this node.
}
}
nodes.push(node[key][i]);
}
if (skipped) {
node[key] = nodes;
}
}