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37 lines
1.2 KiB
37 lines
1.2 KiB
4 years ago
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function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
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import { print } from "@webassemblyjs/wast-printer";
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var SHOW_LINES_AROUND_POINTER = 5;
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function repeat(char, nb) {
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return Array(nb).fill(char).join("");
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} // TODO(sven): allow arbitrary ast nodes
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export function codeFrameFromAst(ast, loc) {
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return codeFrameFromSource(print(ast), loc);
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}
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export function codeFrameFromSource(source, loc) {
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var start = loc.start,
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end = loc.end;
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var length = 1;
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if (_typeof(end) === "object") {
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length = end.column - start.column + 1;
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}
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return source.split("\n").reduce(function (acc, line, lineNbr) {
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if (Math.abs(start.line - lineNbr) < SHOW_LINES_AROUND_POINTER) {
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acc += line + "\n";
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} // Add a new line with the pointer padded left
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if (lineNbr === start.line - 1) {
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acc += repeat(" ", start.column - 1);
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acc += repeat("^", length);
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acc += "\n";
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}
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return acc;
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}, "");
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}
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