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'use strict';
/* Expose. */
module.exports = factory;
/* Factory. */
function factory(file) {
var contents = indices(String(file));
return {
toPosition: offsetToPositionFactory(contents),
toOffset: positionToOffsetFactory(contents)
};
}
/* Factory to get the line and column-based `position` for
* `offset` in the bound indices. */
function offsetToPositionFactory(indices) {
return offsetToPosition;
/* Get the line and column-based `position` for
* `offset` in the bound indices. */
function offsetToPosition(offset) {
var index = -1;
var length = indices.length;
if (offset < 0) {
return {};
}
while (++index < length) {
if (indices[index] > offset) {
return {
line: index + 1,
column: (offset - (indices[index - 1] || 0)) + 1,
offset: offset
};
}
}
return {};
}
}
/* Factory to get the `offset` for a line and column-based
* `position` in the bound indices. */
function positionToOffsetFactory(indices) {
return positionToOffset;
/* Get the `offset` for a line and column-based
* `position` in the bound indices. */
function positionToOffset(position) {
var line = position && position.line;
var column = position && position.column;
if (!isNaN(line) && !isNaN(column) && line - 1 in indices) {
return ((indices[line - 2] || 0) + column - 1) || 0;
}
return -1;
}
}
/* Get indices of line-breaks in `value`. */
function indices(value) {
var result = [];
var index = value.indexOf('\n');
while (index !== -1) {
result.push(index + 1);
index = value.indexOf('\n', index + 1);
}
result.push(value.length + 1);
return result;
}
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