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/** @typedef {import('./types').Location} Location */
/**
* @param {import('./types').Range} range
* @param {number} index
*/
function rangeContains(range, index) {
return range.start <= index && index < range.end;
}
/**
* @param {string} source
* @param {import('./types').Options} [options]
*/
export function getLocator(source, options = {}) {
const { offsetLine = 0, offsetColumn = 0 } = options;
let start = 0;
const ranges = source.split('\n').map((line, i) => {
const end = start + line.length + 1;
/** @type {import('./types').Range} */
const range = { start, end, line: i };
start = end;
return range;
});
let i = 0;
/**
* @param {string | number} search
* @param {number} [index]
* @returns {Location | undefined}
*/
function locator(search, index) {
if (typeof search === 'string') {
search = source.indexOf(search, index ?? 0);
}
if (search === -1) return undefined;
let range = ranges[i];
const d = search >= range.end ? 1 : -1;
while (range) {
if (rangeContains(range, search)) {
return {
line: offsetLine + range.line,
column: offsetColumn + search - range.start,
character: search
};
}
i += d;
range = ranges[i];
}
}
return locator;
}
/**
* @param {string} source
* @param {string | number} search
* @param {import('./types').Options} [options]
* @returns {Location | undefined}
*/
export function locate(source, search, options) {
return getLocator(source, options)(search, options && options.startIndex);
}
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