v1-minimal

This commit is contained in:
Tomas Mirchev 2025-10-30 01:51:21 +02:00
parent f5a64b51ff
commit 5231e7375b
2 changed files with 205 additions and 224 deletions

274
barg.js
View File

@ -1,22 +1,87 @@
const ELEMENTS_SEP = ";";
const ALIAS_SEP = ",";
const ATTR_SEP = ":";
function log(text) {
console.log(JSON.stringify(text, null, 2));
}
let var_values = {};
let required_values = [];
function join(...rest) {
return rest.filter((v) => !!v).join(".");
}
let schema = {};
let alias_map = {};
function take_one(list) {
return list.shift();
}
function take_all(list) {
const all = [...list];
list.length = 0;
return all;
}
function tokenize(input) {
const raw_tokens = input.trim().split(/\s+/).slice(1); // skip command
const tokens = [];
while (raw_tokens.length) {
const raw_token = take_one(raw_tokens);
if (raw_token === "--") {
tokens.push(`rest::${take_all(raw_tokens).join(" ")}`);
break;
}
let key;
let value;
if (raw_token.startsWith("--")) {
[key, value] = raw_token.slice(2).split("=");
tokens.push(`narg::${key}`);
} else if (raw_token.startsWith("-")) {
[key, value] = raw_token.slice(1).split("=");
tokens.push(...key.split("").map((k) => `narg::${k}`));
} else {
tokens.push(`unk::${raw_token}`);
}
if (value !== undefined) {
tokens.push(`value::${value}`);
}
}
return tokens;
}
function parse_input(spec, input) {
const tokens = tokenize(input);
const values = {};
const schema = {};
const alias_map = {};
let position = 0;
let level = 1;
let commands = ["root"];
function register_command(raw_entry) {
const header = raw_entry.split(ELEMENTS_SEP).slice(1);
const aliases = header.shift().split(ALIAS_SEP);
function ref(...rest) {
return commands.slice(0, level).concat(rest).join(".");
}
function get_entry_ref(key) {
return alias_map[ref(key)];
}
function get_entry_item(...keys) {
return schema[join(...keys)];
}
function generate_schema() {
for (const entry of spec) {
const elements = entry.split(";");
const type = elements.shift();
switch (type) {
case "command": {
const aliases = elements.shift().split(",");
const name = aliases[0];
const help = header.shift();
const help = elements.shift();
// Schema
schema[ref(name, "type")] = "command";
@ -31,23 +96,20 @@ function register_command(raw_entry) {
commands.push(name);
level += 1;
position = 0;
break;
}
function end_command() {
case "end": {
level -= 1;
commands.pop();
break;
}
function register_argument(raw_entry) {
const elements = raw_entry.split(ELEMENTS_SEP).slice(1);
let aliases = elements.shift().split(ALIAS_SEP);
case "argument": {
let aliases = elements.shift().split(",");
let name = aliases[0];
const entry = {
required: false,
kind: "positional",
};
const entry = { required: false, kind: "positional" };
for (const element of elements) {
const [attribute, attr_value] = element.split(ATTR_SEP);
const [attribute, attr_value] = element.split(":");
if (attribute === "required") entry.required = true;
else if (attribute === "repeatable") entry.repeatable = true;
@ -70,9 +132,11 @@ function register_argument(raw_entry) {
}
for (const alias of aliases) {
if (entry.kind === "option" || entry.kind === "flag")
if (entry.kind === "option" || entry.kind === "flag") {
alias_map[ref(`narg::${alias}`)] = ref(name);
else alias_map[ref(alias)] = ref(name);
} else {
alias_map[ref(alias)] = ref(name);
}
}
// Schema
@ -80,103 +144,70 @@ function register_argument(raw_entry) {
for (const [key, value] of Object.entries(entry)) {
schema[ref(name, key)] = value;
}
break;
}
function generate_schema(spec) {
for (const entry of spec) {
const elements = entry.split(ELEMENTS_SEP);
const type = elements.shift();
switch (type) {
case "command":
register_command(entry);
break;
case "end":
end_command();
break;
case "argument":
register_argument(entry);
break;
default:
throw new Error(`Invalid entry type: '${type}'`);
}
}
position = 0;
level = 1;
commands = ["root"];
}
function parse_input(spec, input) {
// rest
var_values = {};
required_values = [];
position = 0;
level = 1;
commands = ["root"];
schema = {};
alias_map = {};
// code
generate_schema(spec);
const tokens = tokenize(input);
// log({ schema, alias_map });
function next_token() {
const tagged_token = tokens.shift();
const [type, token] = tagged_token.split("::");
return { original: tagged_token, type, token };
position = 0;
}
function next_value() {
const tagged_token = next_token();
if (tagged_token.type !== "unk") {
throw new Error(`Expected option value, but got: ${tagged_token.token}`);
function next_token_value() {
const token = take_one(tokens);
const [token_type, token_key] = token.split("::");
if (token_type !== "unk") {
throw new Error(`Expected option value, but got: ${token_type}. Token: '${token_key}'`);
}
return tagged_token.token;
return token_key;
}
generate_schema();
while (tokens.length > 0) {
const {
original: token,
type: token_type,
token: token_value,
} = next_token();
const token = take_one(tokens);
const [token_type, token_key] = token.split("::");
if (token_type === "rest") {
var_values["__rest"] = token_value;
values["__rest"] = token_key;
continue;
}
// Bubble up arguments -> Loop over all command levels starting by the latest
let found = false;
for (let i = commands.length; i >= 1; i--) {
level = i;
let entry_ref = alias_map[ref(token)];
for (level = commands.length; level >= 1; level--) {
let entry_ref = get_entry_ref(token);
// Positional arguments are valid only for the latest command
if (!entry_ref && level === commands.length && token_type === "unk") {
entry_ref = alias_map[ref(`pos::${position++}`)];
entry_ref = get_entry_ref(`pos::${position}`);
if (entry_ref) {
position += 1;
}
}
// Try with parent command
if (!entry_ref) {
continue;
}
const [_token_type, token_value] = token.split("::");
const type = schema[join(entry_ref, "type")];
if (type === "command") {
commands.push(token_value);
level += commands.length;
} else if (type === "argument") {
const kind = schema[join(entry_ref, "kind")];
const dest = schema[join(entry_ref, "dest")];
const value = schema[join(entry_ref, "value")];
const entry_type = get_entry_item(entry_ref, "type");
if (entry_type === "command") {
commands.push(token_key);
} else if (entry_type === "argument") {
const kind = get_entry_item(entry_ref, "kind");
const dest = get_entry_item(entry_ref, "dest");
const value = get_entry_item(entry_ref, "value");
var_values[dest] = value; // default one?
values[dest] = value; // default one
if (kind === "flag") var_values[dest] = true;
else if (kind === "option") var_values[dest] = next_value();
else if (kind === "positional") var_values[dest] = token_value;
else if (kind === "rest") var_values[dest] = token_value;
if (kind === "flag") values[dest] = true;
else if (kind === "option") values[dest] = next_token_value();
else if (kind === "positional") values[dest] = token_key;
else if (kind === "rest") values[dest] = token_key;
else throw new Error(`Invalid attribute type: '${kind}'`);
}
found = true;
@ -184,67 +215,14 @@ function parse_input(spec, input) {
}
if (!found) {
console.log(`(Skipping invalid argument: '${token_value}'`);
console.log(`(Skipping invalid argument: '${token_key}'`);
}
}
log({ commands, var_values });
return var_values;
log({ commands, values });
return values;
}
function tokenize(input) {
const raw_tokens = input.split(/\s+/);
raw_tokens.shift(); // drop command
const tokens = [];
while (raw_tokens.length > 0) {
let token = take_token(raw_tokens);
let value;
if (token === "--") {
tokens.push(`rest::${take_all(raw_tokens).join(" ")}`);
continue;
}
if (token.startsWith("--")) {
[token, value] = token.slice(2).split("=");
tokens.push(`narg::${token}`);
} else if (token.startsWith("-")) {
[token, value] = token.slice(1).split("=");
tokens.push(...token.split("").map((t) => `narg::${t}`));
} else {
tokens.push(`unk::${token}`);
}
if (value) {
tokens.push(`value::${value}`);
}
}
return tokens;
}
function take_token(tokens) {
return tokens.shift();
}
function take_all(tokens) {
const all = [...tokens];
tokens.length = 0;
return all;
}
function ref(...rest) {
return commands.slice(0, level).concat(rest).join(".");
}
function join(...rest) {
return rest.filter((v) => !!v).join(".");
}
function log(text) {
console.log(JSON.stringify(text, null, 2));
}
const SPEC = [
"command;build;Build a dev container",
"argument;from;type:option;map:from_name;help:Name of the base container",

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@ -1,3 +1,6 @@
{
"type": "module"
"type": "module",
"prettier": {
"printWidth": 100
}
}