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