Parse_words.zig
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const std = @import("std");
const mem = std.mem;
const fs = std.fs;
const print = std.debug.print;
const ParseError = error{
RanOutOfWords,
};
const Parser = struct {
it: mem.SplitIterator(u8, .scalar),
fn fromString(str: []const u8) Parser {
return Parser{
.it = mem.splitScalar(u8, str, ' '),
};
}
fn take(self: *Parser) ![]const u8 {
const wordo = self.it.next();
if (wordo) |word| {
return word;
} else {
return ParseError.RanOutOfWords;
}
}
fn skip(self: *Parser, cnt: usize) void {
for (0..cnt) |_| {
_ = self.it.next();
}
}
fn takeAsNumber(self: *Parser, Type: type) !Type {
const wordo = self.it.next();
if (wordo) |word| {
return std.fmt.parseInt(Type, word, 10);
} else {
return ParseError.RanOutOfWords;
}
}
};
const Raindeer = struct {
speed: usize,
flight: usize,
rest: usize,
};
fn getLines(path: []const u8, alloc: mem.Allocator) !std.ArrayList(Raindeer) {
const file = fs.cwd().openFile(path, .{}) catch |err| {
std.log.err("Failed to open file {s}", .{@errorName(err)});
return err;
};
defer file.close();
var raindeer = std.ArrayList(Raindeer).init(alloc);
while (file.reader().readUntilDelimiterOrEofAlloc(alloc, '\n', std.math.maxInt(usize)) catch |err| {
std.log.err("Failed to read line: {s}", .{@errorName(err)});
return err;
}) |line| {
defer alloc.free(line);
var words = Parser.fromString(line);
words.skip(3);
const speed = try words.takeAsNumber(usize);
words.skip(2);
const flight = try words.takeAsNumber(usize);
words.skip(6);
const rest = try words.takeAsNumber(usize);
try raindeer.append(.{
.speed = speed,
.flight = flight,
.rest = rest,
});
}
return raindeer;
}
| 1 | const std = @import("std"); |
| 2 | const mem = std.mem; |
| 3 | const fs = std.fs; |
| 4 | const print = std.debug.print; |
| 5 | |
| 6 | const ParseError = error{ |
| 7 | RanOutOfWords, |
| 8 | }; |
| 9 | |
| 10 | const Parser = struct { |
| 11 | it: mem.SplitIterator(u8, .scalar), |
| 12 | |
| 13 | fn fromString(str: []const u8) Parser { |
| 14 | return Parser{ |
| 15 | .it = mem.splitScalar(u8, str, ' '), |
| 16 | }; |
| 17 | } |
| 18 | |
| 19 | fn take(self: *Parser) ![]const u8 { |
| 20 | const wordo = self.it.next(); |
| 21 | if (wordo) |word| { |
| 22 | return word; |
| 23 | } else { |
| 24 | return ParseError.RanOutOfWords; |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | fn skip(self: *Parser, cnt: usize) void { |
| 29 | for (0..cnt) |_| { |
| 30 | _ = self.it.next(); |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | fn takeAsNumber(self: *Parser, Type: type) !Type { |
| 35 | const wordo = self.it.next(); |
| 36 | if (wordo) |word| { |
| 37 | return std.fmt.parseInt(Type, word, 10); |
| 38 | } else { |
| 39 | return ParseError.RanOutOfWords; |
| 40 | } |
| 41 | } |
| 42 | }; |
| 43 | |
| 44 | const Raindeer = struct { |
| 45 | speed: usize, |
| 46 | flight: usize, |
| 47 | rest: usize, |
| 48 | }; |
| 49 | |
| 50 | fn getLines(path: []const u8, alloc: mem.Allocator) !std.ArrayList(Raindeer) { |
| 51 | const file = fs.cwd().openFile(path, .{}) catch |err| { |
| 52 | std.log.err("Failed to open file {s}", .{@errorName(err)}); |
| 53 | return err; |
| 54 | }; |
| 55 | defer file.close(); |
| 56 | |
| 57 | var raindeer = std.ArrayList(Raindeer).init(alloc); |
| 58 | |
| 59 | while (file.reader().readUntilDelimiterOrEofAlloc(alloc, '\n', std.math.maxInt(usize)) catch |err| { |
| 60 | std.log.err("Failed to read line: {s}", .{@errorName(err)}); |
| 61 | return err; |
| 62 | }) |line| { |
| 63 | defer alloc.free(line); |
| 64 | var words = Parser.fromString(line); |
| 65 | words.skip(3); |
| 66 | const speed = try words.takeAsNumber(usize); |
| 67 | words.skip(2); |
| 68 | const flight = try words.takeAsNumber(usize); |
| 69 | words.skip(6); |
| 70 | const rest = try words.takeAsNumber(usize); |
| 71 | try raindeer.append(.{ |
| 72 | .speed = speed, |
| 73 | .flight = flight, |
| 74 | .rest = rest, |
| 75 | }); |
| 76 | } |
| 77 | return raindeer; |
| 78 | } |
| 79 |