101 lines
3.3 KiB
JavaScript
101 lines
3.3 KiB
JavaScript
/**
|
|
* @fileoverview Define utilify functions for token store.
|
|
* @author Toru Nagashima
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const lodash = require("lodash");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Gets `token.range[0]` from the given token.
|
|
* @param {Node|Token|Comment} token The token to get.
|
|
* @returns {number} The start location.
|
|
* @private
|
|
*/
|
|
function getStartLocation(token) {
|
|
return token.range[0];
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Exports
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Binary-searches the index of the first token which is after the given location.
|
|
* If it was not found, this returns `tokens.length`.
|
|
* @param {(Token|Comment)[]} tokens It searches the token in this list.
|
|
* @param {number} location The location to search.
|
|
* @returns {number} The found index or `tokens.length`.
|
|
*/
|
|
exports.search = function search(tokens, location) {
|
|
return lodash.sortedIndexBy(
|
|
tokens,
|
|
{ range: [location] },
|
|
getStartLocation
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Gets the index of the `startLoc` in `tokens`.
|
|
* `startLoc` can be the value of `node.range[1]`, so this checks about `startLoc - 1` as well.
|
|
* @param {(Token|Comment)[]} tokens The tokens to find an index.
|
|
* @param {Object} indexMap The map from locations to indices.
|
|
* @param {number} startLoc The location to get an index.
|
|
* @returns {number} The index.
|
|
*/
|
|
exports.getFirstIndex = function getFirstIndex(tokens, indexMap, startLoc) {
|
|
if (startLoc in indexMap) {
|
|
return indexMap[startLoc];
|
|
}
|
|
if ((startLoc - 1) in indexMap) {
|
|
const index = indexMap[startLoc - 1];
|
|
const token = (index >= 0 && index < tokens.length) ? tokens[index] : null;
|
|
|
|
/*
|
|
* For the map of "comment's location -> token's index", it points the next token of a comment.
|
|
* In that case, +1 is unnecessary.
|
|
*/
|
|
if (token && token.range[0] >= startLoc) {
|
|
return index;
|
|
}
|
|
return index + 1;
|
|
}
|
|
return 0;
|
|
};
|
|
|
|
/**
|
|
* Gets the index of the `endLoc` in `tokens`.
|
|
* The information of end locations are recorded at `endLoc - 1` in `indexMap`, so this checks about `endLoc - 1` as well.
|
|
* @param {(Token|Comment)[]} tokens The tokens to find an index.
|
|
* @param {Object} indexMap The map from locations to indices.
|
|
* @param {number} endLoc The location to get an index.
|
|
* @returns {number} The index.
|
|
*/
|
|
exports.getLastIndex = function getLastIndex(tokens, indexMap, endLoc) {
|
|
if (endLoc in indexMap) {
|
|
return indexMap[endLoc] - 1;
|
|
}
|
|
if ((endLoc - 1) in indexMap) {
|
|
const index = indexMap[endLoc - 1];
|
|
const token = (index >= 0 && index < tokens.length) ? tokens[index] : null;
|
|
|
|
/*
|
|
* For the map of "comment's location -> token's index", it points the next token of a comment.
|
|
* In that case, -1 is necessary.
|
|
*/
|
|
if (token && token.range[1] > endLoc) {
|
|
return index - 1;
|
|
}
|
|
return index;
|
|
}
|
|
return tokens.length - 1;
|
|
};
|