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//! Akiba parameter parsing
pub const Value = union(enum) {
scalar: []const u8,
list: []const []const u8,
};
pub const Named = struct {
key: []const u8,
value: Value,
};
pub const Params = struct {
positionals: []const Value,
named: []const Named,
pub fn positional(self: Params, index: usize) ?Value {
if (index >= self.positionals.len) return null;
return self.positionals[index];
}
pub fn get(self: Params, key: []const u8) ?Value {
for (self.named) |n| {
if (eql(n.key, key)) return n.value;
}
return null;
}
pub fn getString(self: Params, key: []const u8) ?[]const u8 {
const val = self.get(key) orelse return null;
return switch (val) {
.scalar => |s| s,
.list => null,
};
}
pub fn getList(self: Params, key: []const u8) ?[]const []const u8 {
const val = self.get(key) orelse return null;
return switch (val) {
.scalar => null,
.list => |l| l,
};
}
pub fn getBool(self: Params, key: []const u8) ?bool {
const val = self.getString(key) orelse return null;
if (eql(val, "true")) return true;
if (eql(val, "false")) return false;
return null;
}
pub fn getInt(self: Params, key: []const u8) ?i64 {
const val = self.getString(key) orelse return null;
return parseInt(val);
}
};
pub const Error = error{
EmptyToken,
EmptyKey,
EmptyValue,
InvalidKey,
DuplicateKey,
PositionalAfterNamed,
LeadingComma,
TrailingComma,
};
const MAX_POSITIONALS = 16;
const MAX_NAMED = 32;
const MAX_LIST_ITEMS = 16;
var positional_storage: [MAX_POSITIONALS]Value = undefined;
var named_storage: [MAX_NAMED]Named = undefined;
var list_storage: [MAX_POSITIONALS + MAX_NAMED][MAX_LIST_ITEMS][]const u8 = undefined;
var list_index: usize = 0;
pub fn parse(pc: u32, pv: [*]const [*:0]const u8) Error!Params {
var positional_count: usize = 0;
var named_count: usize = 0;
var in_named = false;
list_index = 0;
// Skip program name (pv[0])
var i: u32 = 1;
while (i < pc) : (i += 1) {
const arg = sliceFromCstr(pv[i]);
if (arg.len == 0) return Error.EmptyToken;
const eq_pos = indexOf(arg, '=');
if (eq_pos) |pos| {
// Named parameter
in_named = true;
if (pos == 0) return Error.EmptyKey;
if (pos == arg.len - 1) return Error.EmptyValue;
const key = arg[0..pos];
const value_str = arg[pos + 1 ..];
if (!isValidKey(key)) return Error.InvalidKey;
if (hasDuplicateKey(named_storage[0..named_count], key)) return Error.DuplicateKey;
const value = try parseValue(value_str);
named_storage[named_count] = .{ .key = key, .value = value };
named_count += 1;
} else {
// Positional
if (in_named) return Error.PositionalAfterNamed;
const value = try parseValue(arg);
positional_storage[positional_count] = value;
positional_count += 1;
}
}
return Params{
.positionals = positional_storage[0..positional_count],
.named = named_storage[0..named_count],
};
}
fn parseValue(str: []const u8) Error!Value {
if (str.len == 0) return Error.EmptyValue;
if (str[0] == ',') return Error.LeadingComma;
if (str[str.len - 1] == ',') return Error.TrailingComma;
// Check for commas
var comma_count: usize = 0;
for (str) |c| {
if (c == ',') comma_count += 1;
}
if (comma_count == 0) {
return Value{ .scalar = str };
}
// Parse list
var items: [][]const u8 = list_storage[list_index][0..];
var item_count: usize = 0;
var start: usize = 0;
for (str, 0..) |c, j| {
if (c == ',') {
if (j == start) return Error.LeadingComma; // Empty segment
items[item_count] = str[start..j];
item_count += 1;
start = j + 1;
}
}
// Last item
if (start == str.len) return Error.TrailingComma;
items[item_count] = str[start..];
item_count += 1;
list_index += 1;
return Value{ .list = items[0..item_count] };
}
fn isValidKey(key: []const u8) bool {
if (key.len == 0) return false;
const first = key[0];
if (!isLetter(first)) return false;
for (key[1..]) |c| {
if (!isLetter(c) and !isDigit(c) and c != '_') return false;
}
return true;
}
fn isLetter(c: u8) bool {
return (c >= 'a' and c <= 'z') or (c >= 'A' and c <= 'Z');
}
fn isDigit(c: u8) bool {
return c >= '0' and c <= '9';
}
fn hasDuplicateKey(named: []const Named, key: []const u8) bool {
for (named) |n| {
if (eql(n.key, key)) return true;
}
return false;
}
fn indexOf(str: []const u8, char: u8) ?usize {
for (str, 0..) |c, i| {
if (c == char) return i;
}
return null;
}
fn eql(a: []const u8, b: []const u8) bool {
if (a.len != b.len) return false;
for (a, b) |ac, bc| {
if (ac != bc) return false;
}
return true;
}
fn sliceFromCstr(cstr: [*:0]const u8) []const u8 {
var len: usize = 0;
while (cstr[len] != 0) : (len += 1) {}
return cstr[0..len];
}
fn parseInt(str: []const u8) ?i64 {
if (str.len == 0) return null;
var negative = false;
var start: usize = 0;
if (str[0] == '-') {
negative = true;
start = 1;
}
if (start >= str.len) return null;
var result: i64 = 0;
for (str[start..]) |c| {
if (!isDigit(c)) return null;
result = result * 10 + @as(i64, c - '0');
}
return if (negative) -result else result;
}
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