Odin INI

Package ini provides a parser (and lexer) for .ini files.

Format implemented:

• All the following rules where a character is matched, can have that character escaped with a \ and it will be considered plain text
• Even a \ at the end of a line will escape the newline, adding it to the current key/value/section
• Sections are case-insensitive and transformed to lowercase
• Anything between [ at the start of a line and a ] is a new section
• A [ with no matching ] before the end of the line is illegal
• Anything after a section, until a new section, is in that section
• Comments start with a # or ; at the beginning of a line and end at the end of that line
• Keys are case-insensitive and transformed to lowercase
• Keys start at the beginning of a line, until either a : or a = and thus can not contain those characters
• Each key must have a matching : or =
• Values are optional (defaults to an empty string)
• Values can contain any character, are trimmed of whitespace, and end at the end of the line
• Values can be wrapped in ' or ", these will be stripped, but whitespace in them is sustained

Example usage:

  package main

  import "core:os"
  import "ini"

  main :: proc() {
    config, ok := get_config("foo.ini").?
    if !ok {
        return
    }
    defer ini.ini_delete(config)

    for k, v in config {
        fmt.printf("[%q]\n", k)
        for kk, vv in v {
            fmt.printf("%q = %q\n", kk, vv)
        }
    }
  }

  get_config :: proc(config_file_path: string) -> Maybe(ini.INI) {
    bytes, ok := os.read_entire_file_from_filename(config_file_path)
    if !ok {
        fmt.printf("[ERROR]: could not read %q\n", config_file_path)
        return nil
    }
    defer delete(bytes)

    config, res := parse(bytes)
    using res.pos
    switch res.err {
        case .EOF:              return config
        case .IllegalToken:     fmt.printf("[ERROR]: Illegal token encountered in %q at %d:%d", config_file_path, line+1, col+1)
        case .KeyWithoutEquals: fmt.printf("[ERROR]: Key token found, but not assigned in %q at %d:%d", config_file_path, line+1, col+1)
        case .ValueWithoutKey:  fmt.printf("[ERROR]: Value token found, but not preceeded by a key token in %q at %d:%d", config_file_path, line+1, col+1)
        case .UnexpectedEquals: fmt.printf("[ERROR]: Equals sign found in an unexpected location in %q at %d:%d", config_file_path, line+1, col+1)
    }
  }