128 lines
3.3 KiB
JavaScript
128 lines
3.3 KiB
JavaScript
const createCustomError = require('../utils/createCustomError');
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const generate = require('../definition-syntax/generate');
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const defaultLoc = { offset: 0, line: 1, column: 1 };
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function locateMismatch(matchResult, node) {
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const tokens = matchResult.tokens;
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const longestMatch = matchResult.longestMatch;
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const mismatchNode = longestMatch < tokens.length ? tokens[longestMatch].node || null : null;
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const badNode = mismatchNode !== node ? mismatchNode : null;
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let mismatchOffset = 0;
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let mismatchLength = 0;
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let entries = 0;
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let css = '';
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let start;
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let end;
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for (let i = 0; i < tokens.length; i++) {
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const token = tokens[i].value;
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if (i === longestMatch) {
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mismatchLength = token.length;
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mismatchOffset = css.length;
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}
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if (badNode !== null && tokens[i].node === badNode) {
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if (i <= longestMatch) {
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entries++;
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} else {
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entries = 0;
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}
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}
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css += token;
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}
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if (longestMatch === tokens.length || entries > 1) { // last
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start = fromLoc(badNode || node, 'end') || buildLoc(defaultLoc, css);
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end = buildLoc(start);
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} else {
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start = fromLoc(badNode, 'start') ||
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buildLoc(fromLoc(node, 'start') || defaultLoc, css.slice(0, mismatchOffset));
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end = fromLoc(badNode, 'end') ||
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buildLoc(start, css.substr(mismatchOffset, mismatchLength));
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}
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return {
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css,
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mismatchOffset,
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mismatchLength,
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start,
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end
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};
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}
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function fromLoc(node, point) {
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const value = node && node.loc && node.loc[point];
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if (value) {
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return 'line' in value ? buildLoc(value) : value;
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}
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return null;
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}
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function buildLoc({ offset, line, column }, extra) {
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const loc = {
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offset,
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line,
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column
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};
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if (extra) {
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const lines = extra.split(/\n|\r\n?|\f/);
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loc.offset += extra.length;
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loc.line += lines.length - 1;
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loc.column = lines.length === 1 ? loc.column + extra.length : lines.pop().length + 1;
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}
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return loc;
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}
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const SyntaxReferenceError = function(type, referenceName) {
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const error = createCustomError(
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'SyntaxReferenceError',
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type + (referenceName ? ' `' + referenceName + '`' : '')
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);
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error.reference = referenceName;
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return error;
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};
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const SyntaxMatchError = function(message, syntax, node, matchResult) {
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const error = createCustomError('SyntaxMatchError', message);
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const {
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css,
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mismatchOffset,
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mismatchLength,
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start,
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end
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} = locateMismatch(matchResult, node);
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error.rawMessage = message;
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error.syntax = syntax ? generate(syntax) : '<generic>';
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error.css = css;
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error.mismatchOffset = mismatchOffset;
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error.mismatchLength = mismatchLength;
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error.message = message + '\n' +
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' syntax: ' + error.syntax + '\n' +
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' value: ' + (css || '<empty string>') + '\n' +
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' --------' + new Array(error.mismatchOffset + 1).join('-') + '^';
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Object.assign(error, start);
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error.loc = {
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source: (node && node.loc && node.loc.source) || '<unknown>',
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start,
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end
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};
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return error;
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};
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module.exports = {
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SyntaxReferenceError,
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SyntaxMatchError
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};
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