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use bufio;
use bytes;
use fmt;
use hash;
use hash::fnv;
use io;
use os;
use sys;
use sort;
use sort::cmp;
use strings;
use types;
type data = struct {
min: i64,
max: i64,
sum: i64,
count: size
};
fn i64parse(bytes: []u8) (i64, size) = {
let index = 0z;
let u: i64 = 0;
let neg = 1;
if (bytes[index] == '-') {
neg = -1;
index += 1;
};
u = (bytes[index] - '0'): i64;
index += 1;
if (bytes[index] != '.') {
u = u * 10 + (bytes[index] - '0'): i64;
index += 1;
};
index += 1;
u = u * 10 + (bytes[index] - '0'): i64;
index += 2;
return (u * neg, index);
};
@test fn parsei64() void = {
assert(i64parse(strings::toutf8("0.0")).0 == 0);
assert(i64parse(strings::toutf8("9.2")).0 == 92);
assert(i64parse(strings::toutf8("-9.2")).0 == -92);
assert(i64parse(strings::toutf8("98.2")).0 == 982);
assert(i64parse(strings::toutf8("-98.2")).0 == -982);
};
fn mmap(fd: io::file) []u8 = {
let sb = sys::st { ... };
sys::fstat(fd, &sb)!;
let ptr = sys::mmap(null, sb.sz, sys::PROT_READ, sys::MAP_PRIVATE, fd, 0)!;
// Hardcoded value for MADV_SEQUENTIAL, from libc-rs it seems like it's
// 2 on all currently supported platforms (Linux, FreeBSD, NetBSD,
// OpenBSD, Dragonfly).
assert(sys::syscall(sys::SYS_madvise, ptr: uintptr: u64, sb.sz: u64, 2) == 0);
return *(&types::slice {
data = ptr,
length = sb.sz,
capacity = 0
}: *[]u8);
};
fn free_mmap(map: []u8) void = {
let map = &map: *types::slice;
sys::munmap(map.data: *opaque, map.length)!;
};
fn names_cmp(a: *opaque, b: *opaque) int = {
const a = *(a: *(u64, str));
const b = *(b: *(u64, str));
return cmp::strs(&a.1, &b.1);
};
export fn main() void = {
let map: hashmap = [[]...];
defer finish(&map);
if (len(os::args) != 2)
fmt::fatalf("usage: {} <file>", os::args[0]);
const handle = os::open(os::args[1])!;
defer io::close(handle)!;
const fmap = mmap(handle);
free_mmap(fmap);
let buf: *[1024 * 1024]u8 = alloc([0...])!;
defer free(buf);
let read_start = 0z;
let names_buf: *[10000](u64, str) = alloc([(0, "")...])!;
let names = names_buf[..0];
let fnv = fnv::fnv64a();
for (true) {
const n = match (io::read(handle, buf[read_start..])) {
case let n: size =>
yield n;
case io::EOF =>
break;
};
if (read_start + n == 0) break;
let chunk = buf[..read_start + n];
let newline = match(bytes::rindex(chunk, '\n': u8)) {
case let idx: size =>
yield idx;
case void =>
break;
};
let remaining = chunk[newline + 1..];
chunk = chunk[..newline + 1];
for (true) {
let sep_idx = 0z;
let has_semi = false;
for (const char .. chunk) {
if (char == ';': u8) {
has_semi = true;
break;
};
fnv.v ^= char;
fnv.v *= 1099511628211;
sep_idx += 1;
};
if (!has_semi) break;
const hash = fnv::sum64(&fnv);
hash::reset(&fnv);
let after = chunk[sep_idx + 1..];
const name = strings::fromutf8_unsafe(chunk[..sep_idx]);
const (temp, index) = i64parse(after);
chunk = after[index..];
let item = getitem(&map, hash);
if (item.count == 0) {
static append(names, (hash, strings::dup(name)!))!;
item.min = temp;
item.max = temp;
} else {
if (item.min > temp)
item.min = temp;
if (item.max < temp)
item.max = temp;
};
item.sum += temp;
item.count += 1;
setitem(&map, hash, item);
};
read_start = len(remaining);
buf[..read_start] = remaining[..];
};
sort::sort(names, size((u64, str)), &names_cmp)!;
fmt::print("{")!;
for (let i = 0z; i < len(names); i += 1) {
let station = names[i].1;
let item = getitem(&map, names[i].0);
if (i > 0)
fmt::print(", ")!;
fmt::printf("\"{}\"={:.1f}/{:.1f}/{:.1f}",
station,
item.min: f64 / 10.0,
item.max: f64 / 10.0,
item.sum: f64 / 10.0 / item.count: f64,
)!;
free(names[i].1);
};
fmt::println("}")!;
free(names);
};
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