You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.7 KiB
JavaScript
77 lines
2.7 KiB
JavaScript
// Compute the edit distance between the two given strings
|
|
function getEditDistance(sourceString, targetString) {
|
|
if (sourceString.length === 0) return targetString.length;
|
|
if (targetString.length === 0) return sourceString.length;
|
|
|
|
let matrix = [];
|
|
|
|
// increment along the first column of each row
|
|
for (let i = 0; i <= targetString.length; i++) {
|
|
matrix[i] = [i];
|
|
}
|
|
|
|
// increment each column in the first row
|
|
for (let j = 0; j <= sourceString.length; j++) {
|
|
matrix[0][j] = j;
|
|
}
|
|
|
|
// Fill in the rest of the matrix
|
|
for (let i = 1; i <= targetString.length; i++) {
|
|
for (let j = 1; j <= sourceString.length; j++) {
|
|
let cost = 1;
|
|
if (targetString.charAt(i-1) === sourceString.charAt(j-1)) {
|
|
cost = 0;
|
|
}
|
|
matrix[i][j] = Math.min(matrix[i-1][j-1] + cost, // substitution
|
|
matrix[i][j-1] + 1, // insertion
|
|
matrix[i-1][j] + 1 // deletion
|
|
);
|
|
}
|
|
}
|
|
return matrix[targetString.length][sourceString.length];
|
|
}
|
|
|
|
function fetchCommand(input, commands, threshhold){
|
|
let candidates = {};
|
|
let bestDistance = null;
|
|
for(let key in commands){
|
|
let distance = getEditDistance(input, key);
|
|
console.log("new it. key: "+key+" dist:"+distance);
|
|
if(distance >= threshhold) continue;
|
|
if(bestDistance === distance){ //another candidate
|
|
candidates[candidates.length] = key;
|
|
console.log("other candidate");
|
|
}
|
|
else if(bestDistance > distance || bestDistance === null){ //new best candidate
|
|
candidates = [key];
|
|
bestDistance = distance;
|
|
console.log("new best candidate");
|
|
}
|
|
}
|
|
return candidates;
|
|
}
|
|
|
|
module.exports.fetchCommand = fetchCommand;
|
|
module.exports.getEditDistance = getEditDistance;
|
|
|
|
/* //Test code
|
|
const commands = {};
|
|
commands['homeserver'] = {};
|
|
commands['homeserver']['register'] = {};
|
|
commands['homeserver']['register'].regex = /([a-zA-Z0-9])/;
|
|
commands['homeserver']['register'].usage = '<user localpart>';
|
|
commands['homeserver']['register'].exec = (args) => {
|
|
//args is a <user input args string>.match with .regex
|
|
};
|
|
|
|
commands['imninja'] = {};
|
|
commands['imninja']['register'] = {};
|
|
commands['imninja']['register'].regex = /([a-zA-Z0-9])/;
|
|
commands['imninja']['register'].usage = '<user localpart>';
|
|
commands['imninja']['register'].exec = (args) => {
|
|
//args is a <user input args string>.match with .regex
|
|
};
|
|
console.log(fetchCommand("inminja", commands)); // -> imninja
|
|
console.log(fetchCommand("34C21", commands, 4)); // -> {}*/
|
|
//console.log(getEditDistance("saturday", "sunday")); //should be 3
|