94 lines
2.6 KiB
JavaScript
94 lines
2.6 KiB
JavaScript
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var createCustomError = require('../utils/createCustomError');
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var generateGrammar = require('./grammar/generate');
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function fromMatchResult(matchResult) {
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var tokens = matchResult.tokens;
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var longestMatch = matchResult.longestMatch;
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var node = longestMatch < tokens.length ? tokens[longestMatch].node : null;
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var mismatchOffset = -1;
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var entries = 0;
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var css = '';
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for (var i = 0; i < tokens.length; i++) {
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if (i === longestMatch) {
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mismatchOffset = css.length;
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}
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if (node !== null && tokens[i].node === node) {
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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 += tokens[i].value;
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}
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return {
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node: node,
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css: css,
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mismatchOffset: mismatchOffset === -1 ? css.length : mismatchOffset,
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last: node === null || entries > 1
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};
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}
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function getLocation(node, point) {
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var loc = node && node.loc && node.loc[point];
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if (loc) {
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return {
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offset: loc.offset,
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line: loc.line,
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column: loc.column
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};
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}
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return null;
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}
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var SyntaxReferenceError = function(type, referenceName) {
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var 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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var MatchError = function(message, syntax, node, matchResult) {
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var error = createCustomError('SyntaxMatchError', message);
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var details = fromMatchResult(matchResult);
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var mismatchOffset = details.mismatchOffset || 0;
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var badNode = details.node || node;
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var end = getLocation(badNode, 'end');
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var start = details.last ? end : getLocation(badNode, 'start');
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var css = details.css;
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error.rawMessage = message;
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error.syntax = syntax ? generateGrammar(syntax) : '<generic>';
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error.css = css;
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error.mismatchOffset = mismatchOffset;
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error.loc = {
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source: (badNode && badNode.loc && badNode.loc.source) || '<unknown>',
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start: start,
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end: end
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};
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error.line = start ? start.line : undefined;
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error.column = start ? start.column : undefined;
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error.offset = start ? start.offset : undefined;
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error.message = message + '\n' +
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' syntax: ' + error.syntax + '\n' +
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' value: ' + (error.css || '<empty string>') + '\n' +
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' --------' + new Array(error.mismatchOffset + 1).join('-') + '^';
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return error;
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};
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module.exports = {
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SyntaxReferenceError: SyntaxReferenceError,
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MatchError: MatchError
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};
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