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Rudimentary INI parser in Zig
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| const std = @import("std"); | |
| const string = []const u8; | |
| const Allocator = std.mem.Allocator; | |
| /// Given an entire INI string, parses it into a map of key-value pairs. | |
| /// The pairs are all freed by a call to `Parser.deinit`, and retrieved via `Parser.get`. | |
| /// If you need them to live beyond that, use `some_other_allocator.dupe(u8, value)`. | |
| pub const Parser = struct { | |
| data: std.StringArrayHashMap(string), | |
| arena: std.heap.ArenaAllocator, | |
| /// Parses an entire INI string into a map of key-value pairs. | |
| /// See `Parser.get` and `Parser.deinit`. | |
| pub fn parse(input: string, ally: Allocator) !Parser { | |
| var p = Parser { | |
| .data = undefined, | |
| .arena = std.heap.ArenaAllocator.init(ally), | |
| }; | |
| p.data = std.StringArrayHashMap(string).init(p.arena.allocator()); | |
| try p.data.ensureTotalCapacity(32); | |
| errdefer p.deinit(); | |
| var stream = std.io.fixedBufferStream(input); | |
| const r = stream.reader(); | |
| while (try r.readUntilDelimiterOrEofAlloc(p.arena.allocator(), '\n', std.math.maxInt(u32))) |line| { | |
| const trimmed_line = std.mem.trim(u8, line, "\r\n\t"); | |
| if (trimmed_line.len == 0) continue; | |
| if (trimmed_line[0] == '#') continue; | |
| if (std.mem.indexOfScalar(u8, trimmed_line, '=')) |i| { | |
| const key = std.mem.trim(u8, trimmed_line[0..i-1], "\r\t "); | |
| const value = std.mem.trim(u8, trimmed_line[i+1..], "\r\t "); | |
| try p.data.put(key, value); | |
| } | |
| } | |
| return p; | |
| } | |
| /// Frees all key-value pairs that were allocated by `Parser.parse`. | |
| pub fn deinit(p: *Parser) void { | |
| p.arena.deinit(); | |
| p.* = undefined; | |
| } | |
| /// Lookup a key. | |
| /// | |
| /// The string returned by this function is freed by `Parser.deinit`. | |
| /// If you need it to live beyond that, use `some_other_allocator.dupe(u8, value)`. | |
| pub fn get(p: *Parser, key: string) ?string { | |
| return p.data.get(key); | |
| } | |
| }; |
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