78 lines
2.4 KiB
JavaScript
78 lines
2.4 KiB
JavaScript
const OPEN_BRACKET = /(?<escape>\\|)(?<brackets>\{\{)/;
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const CLOSE_BRACKET = /(?<escape>\\|)(?<brackets>\}\})/;
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export const escapeCode = (text) => {
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return text.replace('\\}}', '}}');
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};
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export const splitExpression = (expression) => {
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const chunks = [];
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let searchingFor = 'open';
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let activeRegex = OPEN_BRACKET;
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let buffer = '';
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let index = 0;
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while (index < expression.length) {
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const expr = expression.slice(index);
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const res = activeRegex.exec(expr);
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// No more brackets. If it's a closing bracket
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// this is sort of valid so we accept it but mark
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// that it has no closing bracket.
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if (!res?.groups) {
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buffer += expr;
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if (searchingFor === 'open') {
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chunks.push({
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type: 'text',
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text: buffer,
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});
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}
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else {
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chunks.push({
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type: 'code',
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text: escapeCode(buffer),
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hasClosingBrackets: false,
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});
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}
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break;
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}
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if (res.groups.escape) {
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buffer += expr.slice(0, res.index + 3);
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index += res.index + 3;
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}
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else {
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buffer += expr.slice(0, res.index);
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if (searchingFor === 'open') {
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chunks.push({
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type: 'text',
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text: buffer,
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});
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searchingFor = 'close';
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activeRegex = CLOSE_BRACKET;
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}
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else {
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chunks.push({
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type: 'code',
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text: escapeCode(buffer),
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hasClosingBrackets: true,
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});
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searchingFor = 'open';
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activeRegex = OPEN_BRACKET;
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}
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index += res.index + 2;
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buffer = '';
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}
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}
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return chunks;
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};
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// Expressions only have closing brackets escaped
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const escapeTmplExpression = (part) => {
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return part.replace('}}', '\\}}');
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};
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export const joinExpression = (parts) => {
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return parts
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.map((chunk) => {
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if (chunk.type === 'code') {
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return `{{${escapeTmplExpression(chunk.text)}${chunk.hasClosingBrackets ? '}}' : ''}`;
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}
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return chunk.text;
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})
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.join('');
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};
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//# sourceMappingURL=expression-parser.js.map
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