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/**
* Webpack loader that converts HTML template files into JavaScript modules.
* It escapes template literals and replaces `$name$` placeholders with
* `${name}` interpolation syntax so the exported function can accept a
* replacements object.
*
* @param {string} source - Raw HTML file content.
* @returns {string} A JS module that exports a function accepting
* replacement values and returning the interpolated HTML string.
*/
export default function(source) {
source = source
.replaceAll("\\", "\\\\")
.replaceAll("`", "\\`")
.replaceAll("${", "\\${");
const replacements = {};
let i = 0;
while (true) {
i = source.indexOf("$", i) + 1;
if (i <= 0) {
break;
}
const end = source.indexOf("$", i);
if (end < 0) {
break;
}
const replacementVariable = source.substring(i, end);
replacements[replacementVariable] = 1;
source = source.substring(0, i - 1) + `\${${replacementVariable}}` + source.substring(end + 1);
i = end + 1;
}
source = `\`${source}\``;
const replacementList = [];
for (const replacement in replacements) {
replacementList.push(replacement);
}
const replacementArguments = replacementList.length > 0
? `{ ${replacementList.join(", ")} }`
: "";
return `export default (${replacementArguments}) => ${source};`;
};
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