35 lines
933 B
Plaintext
35 lines
933 B
Plaintext
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import { normalizeLF } from "./utils.js";
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function codeFrame(src, loc) {
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if (!loc || loc.line === void 0 || loc.column === void 0) {
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return "";
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}
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const lines = normalizeLF(src).split("\n").map((ln) => ln.replace(/\t/g, " "));
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const visibleLines = [];
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for (let n = -2; n <= 2; n++) {
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if (lines[loc.line + n])
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visibleLines.push(loc.line + n);
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}
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let gutterWidth = 0;
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for (const lineNo of visibleLines) {
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let w = `> ${lineNo}`;
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if (w.length > gutterWidth)
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gutterWidth = w.length;
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}
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let output = "";
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for (const lineNo of visibleLines) {
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const isFocusedLine = lineNo === loc.line - 1;
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output += isFocusedLine ? "> " : " ";
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output += `${lineNo + 1} | ${lines[lineNo]}
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`;
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if (isFocusedLine)
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output += `${Array.from({ length: gutterWidth }).join(" ")} | ${Array.from({
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length: loc.column
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}).join(" ")}^
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`;
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}
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return output;
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}
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export {
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codeFrame
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};
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