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import { applyReplacements } from "./replacements";
/**
* Slices a string until it hits a }, but keeping in mind JS comments,
* regex, template literals, comments, and matching {
*
* Used to extract function bodies without parsing the code.
*
* If you pass replace=true, it will run replacements on the code
*/
export function sliceSourceCode(
contents: string,
replace: boolean,
replaceRequire?: (specifier: string) => string,
endOnComma = false,
): { result: string; rest: string } {
let bracketCount = 0;
let i = 0;
let result = "";
while (contents.length) {
const match = contents.match(
endOnComma && bracketCount <= 1
? /((?:[(,=;:{]|return|\=\>)\s*)\/[^\/\*]|\/\*|\/\/|['"}`\),]|(?<!\$)\brequire\(|(\$assert\(|\$debug\()/
: /((?:[(,=;:{]|return|\=\>)\s*)\/[^\/\*]|\/\*|\/\/|['"}`\)]|(?<!\$)\brequire\(|(\$assert\(|\$debug\()/,
);
i = match?.index ?? contents.length;
if (match?.[2]) {
i += match[2].length - 1;
}
bracketCount += [...contents.slice(0, i).matchAll(/[({]/g)].length;
const chunk = replace ? applyReplacements(contents, i) : [contents.slice(0, i), contents.slice(i)];
result += chunk[0];
contents = chunk[1] as string;
if (chunk[2]) {
continue;
}
if (match?.[1]) {
if (match[1].startsWith("(") || match[1].startsWith(",")) {
bracketCount++;
}
const { result: result2, rest } = sliceRegularExpressionSourceCode(
contents.slice(match?.[1].length + 1),
replace,
);
result += contents.slice(0, match?.[1].length + 1) + result2;
contents = rest;
continue;
}
if (!contents.length) break;
if (contents.startsWith("/*")) {
i = contents.slice(2).indexOf("*/") + 2;
} else if (contents.startsWith("//")) {
i = contents.slice(2).indexOf("\n") + 2;
} else if (contents.startsWith("'")) {
i = getEndOfBasicString(contents.slice(1), "'") + 2;
} else if (contents.startsWith('"')) {
i = getEndOfBasicString(contents.slice(1), '"') + 2;
} else if (contents.startsWith("`")) {
const { result: result2, rest } = sliceTemplateLiteralSourceCode(contents.slice(1), replace);
result += "`" + result2;
contents = rest;
i = 0;
continue;
} else if (contents.startsWith("}")) {
bracketCount--;
if (bracketCount <= 0) {
result += "}";
contents = contents.slice(1);
break;
}
i = 1;
} else if (contents.startsWith(")")) {
bracketCount--;
if (bracketCount <= 0) {
result += ")";
contents = contents.slice(1);
break;
}
i = 1;
} else if (endOnComma && contents.startsWith(",")) {
if (bracketCount <= 1) {
result += ",";
contents = contents.slice(1);
// if the next non-whitespace character is ), also consume
let match = contents.match(/^\s*\)/);
if (match) {
contents = contents.slice(match[0].length);
}
break;
}
i = 1;
} else if (contents.startsWith("require(")) {
if (replaceRequire) {
const staticSpecifier = contents.match(/\brequire\(["']([^"']+)["']\)/);
if (staticSpecifier) {
const specifier = staticSpecifier[1];
result += replaceRequire(specifier);
contents = contents.slice(staticSpecifier[0].length);
continue;
} else {
throw new Error("Require with dynamic specifier not supported here.");
}
} else {
throw new Error("Require is not supported here.");
}
} else {
console.error(contents.slice(0, 100));
throw new Error("TODO");
}
result += contents.slice(0, i);
contents = contents.slice(i);
}
return { result, rest: contents };
}
function sliceTemplateLiteralSourceCode(contents: string, replace: boolean) {
let i = 0;
let result = "";
while (contents.length) {
i = contents.match(/`|\${/)!.index!;
result += contents.slice(0, i);
contents = contents.slice(i);
if (!contents.length) break;
if (contents.startsWith("`")) {
result += "`";
contents = contents.slice(1);
break;
} else if (contents.startsWith("$")) {
const { result: result2, rest } = sliceSourceCode(contents.slice(1), replace);
result += "$" + result2;
contents = rest;
continue;
} else {
throw new Error("TODO");
}
}
return { result, rest: contents };
}
function sliceRegularExpressionSourceCode(contents: string, replace: boolean) {
let i = 0;
let result = "";
while (contents.length) {
i = contents.match(/\/(?!\/|\*)|\\|\[/)!.index!;
result += contents.slice(0, i);
contents = contents.slice(i);
if (!contents.length) break;
if (contents.startsWith("/")) {
result += "/";
contents = contents.slice(1);
break;
} else if (contents.startsWith("\\")) {
result += "\\";
contents = contents.slice(1);
if (!contents.length) break;
result += contents[0];
contents = contents.slice(1);
continue;
} else if (contents.startsWith("[")) {
let end = contents.match(/(?<!\\)]/)!.index!;
result += contents.slice(0, end + 1);
contents = contents.slice(end + 1);
continue;
} else {
throw new Error("TODO");
}
}
return { result, rest: contents };
}
function getEndOfBasicString(str: string, quote: "'" | '"') {
let i = 0;
while (i < str.length) {
if (str[i] === "\\") {
i++;
} else if (str[i] === quote) {
return i;
}
i++;
}
throw new Error("String did not end");
}
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