Module: Philiprehberger::IniParser

Defined in:
lib/philiprehberger/ini_parser.rb,
lib/philiprehberger/ini_parser/parser.rb,
lib/philiprehberger/ini_parser/version.rb,
lib/philiprehberger/ini_parser/serializer.rb

Defined Under Namespace

Classes: Error, ParseError, Parser, Serializer

Constant Summary collapse

SECTION_RE = 
/\A\s*\[([^\]]+)\]\s*\z/
INTERPOLATION_RE = 
/\$\{([^}]+)\}/
ENV_INTERPOLATION_RE = 
/\$\{([A-Za-z_][A-Za-z0-9_]*)(?::-(.*?))?\}/
VERSION = 
'0.9.0'

Class Method Summary collapse

Class Method Details

.delete(hash, path) ⇒ Object?

Delete a value by dot-separated path.

Parameters:

  • hash (Hash) —

    parsed configuration (mutated in place)

  • path (String) —

    dot-separated key path (e.g. “database.host”)

Returns:

  • (Object, nil) —

    the deleted value, or nil if the path did not exist



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# File 'lib/philiprehberger/ini_parser.rb', line 321

def self.delete(hash, path)
  keys = path.to_s.split('.')
  last = keys.pop
  current = hash

  keys.each do |key|
    return nil unless current.is_a?(Hash) && current.key?(key)

    current = current[key]
  end

  return nil unless current.is_a?(Hash)

  current.delete(last)
end

.diff(a, b) ⇒ Hash

Compare two parsed INI hashes and return a diff.

Parameters:

  • a (Hash) —

    first configuration (from parse)

  • b (Hash) —

    second configuration (from parse)

Returns:

  • (Hash) —

    diff with :added, :removed, and :changed keys



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# File 'lib/philiprehberger/ini_parser.rb', line 145

def self.diff(a, b)
  result = { added: {}, removed: {}, changed: {} }

  all_keys = (a.keys + b.keys).uniq

  all_keys.each do |key|
    in_a = a.key?(key)
    in_b = b.key?(key)

    if in_a && in_b
      diff_key(key, a[key], b[key], result)
    elsif in_b
      add_to_result(result[:added], key, b[key])
    else
      add_to_result(result[:removed], key, a[key])
    end
  end

  result
end

.dump(hash) ⇒ String

Serialize a Hash to an INI string.

Parameters:

  • hash (Hash) —

    configuration data

Returns:

  • (String) —

    INI formatted string



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# File 'lib/philiprehberger/ini_parser.rb', line 73

def self.dump(hash)
  Serializer.new.serialize(hash)
end

.filter(hash, section:) ⇒ Hash

Filter a parsed INI hash to only the named section(s).

Returns a new hash containing only the entries whose keys match the given section name(s). The input hash is not mutated. Unknown sections are silently ignored and yield an empty hash.

Parameters:

  • hash (Hash) —

    parsed configuration

  • section (String, Symbol, Array<String, Symbol>) —

    section name(s) to keep

Returns:

  • (Hash) —

    new hash containing only the named section(s)

Raises:

  • (ArgumentError) —

    if hash is not a Hash



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# File 'lib/philiprehberger/ini_parser.rb', line 114

def self.filter(hash, section:)
  raise ArgumentError, 'hash must be a Hash' unless hash.is_a?(Hash)

  sections = Array(section).map(&:to_s)
  hash.each_with_object({}) do |(k, v), acc|
    acc[k] = v if sections.include?(k.to_s)
  end
end

.flatten(hash) ⇒ Hash{String => Object}

Flatten a nested INI hash to dot-separated keys.

Parameters:

  • hash (Hash) —

    parsed configuration

Returns:

  • (Hash{String => Object}) —

    flat hash with dot-separated keys



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# File 'lib/philiprehberger/ini_parser.rb', line 286

def self.flatten(hash)
  result = {}
  hash.each do |key, value|
    if value.is_a?(Hash)
      value.each { |sub_key, sub_val| result["#{key}.#{sub_key}"] = sub_val }
    else
      result[key.to_s] = value
    end
  end
  result
end

.get(hash, path, default: nil) ⇒ Object

Retrieve a value from a parsed hash using a dot-separated path.

Parameters:

  • hash (Hash) —

    parsed configuration

  • path (String) —

    dot-separated key path (e.g. “database.host”)

  • default (Object) (defaults to: nil) —

    value to return if the path does not exist

Returns:

  • (Object) —

    the value at the path, or the default



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# File 'lib/philiprehberger/ini_parser.rb', line 248

def self.get(hash, path, default: nil)
  keys = path.to_s.split('.')
  current = hash

  keys.each do |key|
    return default unless current.is_a?(Hash) && current.key?(key)

    current = current[key]
  end

  current
end

.has_key?(hash, path) ⇒ Boolean

Check whether a dot-path key exists in a parsed INI hash.

Parameters:

  • hash (Hash) —

    parsed configuration

  • path (String) —

    dot-separated key path (e.g. “database.host”)

Returns:

  • (Boolean) —

    true if the path exists



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# File 'lib/philiprehberger/ini_parser.rb', line 370

def self.has_key?(hash, path)
  keys = path.to_s.split('.')
  current = hash

  keys.each do |key|
    return false unless current.is_a?(Hash) && current.key?(key)

    current = current[key]
  end

  true
end

.has_section?(hash, name) ⇒ Boolean

Whether a parsed INI hash contains the given section.

A section is a top-level key whose value is a Hash. Returns ‘false` if the key exists but maps to a scalar (i.e. is a global key, not a section). String/symbol-equivalent names are matched after `to_s`.

Parameters:

  • hash (Hash) —

    parsed configuration

  • name (String, Symbol) —

    the section name to check

Returns:

  • (Boolean)

Raises:

  • (ArgumentError) —

    if hash is not a Hash



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# File 'lib/philiprehberger/ini_parser.rb', line 133

def self.has_section?(hash, name)
  raise ArgumentError, 'hash must be a Hash' unless hash.is_a?(Hash)

  target = name.to_s
  hash.any? { |k, v| k.to_s == target && v.is_a?(Hash) }
end

.keys(hash, section: nil) ⇒ Array<String>

Return all keys from a parsed INI hash.

When no section is given, returns all keys including dot-path keys for nested sections. When a section is given, returns only the keys within that section.

Parameters:

  • hash (Hash) —

    parsed configuration

  • section (String, nil) (defaults to: nil) —

    optional section to scope keys to

Returns:

  • (Array<String>) —

    list of keys



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# File 'lib/philiprehberger/ini_parser.rb', line 346

def self.keys(hash, section: nil)
  if section
    sub = hash[section]
    return [] unless sub.is_a?(Hash)

    sub.keys
  else
    result = []
    hash.each do |key, value|
      if value.is_a?(Hash)
        value.each_key { |sub_key| result << "#{key}.#{sub_key}" }
      else
        result << key.to_s
      end
    end
    result
  end
end

.load(path, coerce_types: true, interpolate: false, interpolate_env: false, includes: false) ⇒ Hash

Parse an INI file into a Hash.

Parameters:

  • path (String) —

    path to an INI file

  • coerce_types (Boolean) (defaults to: true) —

    coerce booleans, integers, and floats

  • interpolate (Boolean) (defaults to: false) —

    expand $VAR references after parsing

  • interpolate_env (Boolean) (defaults to: false) —

    expand $VAR and $VAR:-default from ENV

  • includes (Boolean) (defaults to: false) —

    process @include directives

Returns:

  • (Hash) —

    parsed configuration

Raises:

  • (ParseError) —

    if the file contains invalid lines

  • (Errno::ENOENT) —

    if the file does not exist

  • (Error) —

    if circular includes are detected



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# File 'lib/philiprehberger/ini_parser.rb', line 59

def self.load(path, coerce_types: true, interpolate: false, interpolate_env: false, includes: false)
  parse(
    File.read(path, encoding: 'utf-8'),
    coerce_types: coerce_types,
    interpolate: interpolate,
    interpolate_env: interpolate_env,
    includes: includes
  )
end

.merge(base, override) ⇒ Hash

Deep merge two INI configurations.

Section-aware: when both hashes contain the same section key, the section contents are merged rather than replaced.

Parameters:

  • base (Hash) —

    base configuration

  • override (Hash) —

    overriding configuration

Returns:

  • (Hash) —

    merged result



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# File 'lib/philiprehberger/ini_parser.rb', line 94

def self.merge(base, override)
  base.merge(override) do |_key, old_val, new_val|
    if old_val.is_a?(Hash) && new_val.is_a?(Hash)
      old_val.merge(new_val)
    else
      new_val
    end
  end
end

.parse(string, coerce_types: true, interpolate: false, interpolate_env: false, includes: false) ⇒ Hash

Parse an INI string into a Hash.

Top-level keys become global entries. Sections become nested Hashes.

Parameters:

  • string (String) —

    INI content

  • coerce_types (Boolean) (defaults to: true) —

    coerce booleans, integers, and floats

  • interpolate (Boolean) (defaults to: false) —

    expand $VAR references after parsing

  • interpolate_env (Boolean) (defaults to: false) —

    expand $VAR and $VAR:-default from ENV

  • includes (Boolean) (defaults to: false) —

    process @include directives

Returns:

  • (Hash) —

    parsed configuration

Raises:

  • (ParseError) —

    if the input contains invalid lines

  • (Error) —

    if circular includes are detected



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# File 'lib/philiprehberger/ini_parser.rb', line 30

def self.parse(string, coerce_types: true, interpolate: false, interpolate_env: false, includes: false)
  if includes
    string = process_includes(string, [])
  end

  result = Parser.new.parse(string, coerce_types: coerce_types)

  if interpolate
    interpolate_hash(result, result)
  end

  if interpolate_env
    interpolate_env_hash(result)
  end

  result
end

.save(hash, path) ⇒ void

This method returns an undefined value.

Write a Hash to an INI file.

Parameters:

  • hash (Hash) —

    configuration data

  • path (String) —

    output file path



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# File 'lib/philiprehberger/ini_parser.rb', line 82

def self.save(hash, path)
  File.write(path, dump(hash), encoding: 'utf-8')
end

.sections(string_or_path) ⇒ Array<String>

Extract section names from INI content without fully parsing values.

Parameters:

  • string_or_path (String) —

    INI content string or file path

Returns:

  • (Array<String>) —

    section names



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# File 'lib/philiprehberger/ini_parser.rb', line 387

def self.sections(string_or_path)
  content = File.exist?(string_or_path) ? File.read(string_or_path, encoding: 'utf-8') : string_or_path
  names = []

  content.each_line do |line|
    match = SECTION_RE.match(line.strip)
    names << match[1].strip if match
  end

  names
end

.set(hash, path, value) ⇒ Object

Set a value in a parsed hash using a dot-separated path.

Creates intermediate section hashes as needed.

Parameters:

  • hash (Hash) —

    parsed configuration (mutated in place)

  • path (String) —

    dot-separated key path (e.g. “database.host”)

  • value (Object) —

    the value to set

Returns:

  • (Object) —

    the value that was set



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# File 'lib/philiprehberger/ini_parser.rb', line 269

def self.set(hash, path, value)
  keys = path.to_s.split('.')
  last = keys.pop
  current = hash

  keys.each do |key|
    current[key] = {} unless current[key].is_a?(Hash)
    current = current[key]
  end

  current[last] = value
end

.to_env(hash) ⇒ String

Convert a parsed INI hash to flat KEY=VALUE environment format.

Section keys become SECTION_KEY=value (uppercased with underscore separator). Global keys are simply uppercased.

Parameters:

  • hash (Hash) —

    parsed configuration

Returns:

  • (String) —

    environment variable format



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# File 'lib/philiprehberger/ini_parser.rb', line 225

def self.to_env(hash)
  lines = []

  hash.each do |key, value|
    if value.is_a?(Hash)
      value.each do |sub_key, sub_val|
        env_key = "#{key}_#{sub_key}".upcase
        lines << "#{env_key}=#{sub_val}"
      end
    else
      lines << "#{key.upcase}=#{value}"
    end
  end

  lines.join("\n")
end

.unflatten(hash) ⇒ Hash

Convert a flat dot-separated hash back to nested sections.

Parameters:

  • hash (Hash{String => Object}) —

    flat hash with dot-separated keys

Returns:

  • (Hash) —

    nested configuration hash



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# File 'lib/philiprehberger/ini_parser.rb', line 302

def self.unflatten(hash)
  result = {}
  hash.each do |key, value|
    parts = key.to_s.split('.', 2)
    if parts.length == 2
      result[parts[0]] ||= {}
      result[parts[0]][parts[1]] = value
    else
      result[parts[0]] = value
    end
  end
  result
end

.valid?(string) ⇒ Boolean

Check whether an INI string is syntactically valid.

Parameters:

  • string (String) —

    INI content

Returns:

  • (Boolean) —

    true if the content parses without errors



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# File 'lib/philiprehberger/ini_parser.rb', line 170

def self.valid?(string)
  parse(string)
  true
rescue ParseError
  false
end

.validate(string) ⇒ Array<Hash{Symbol => Object}>

Validate an INI string and return detailed errors.

Returns an array of hashes, each with :line and :message keys, describing syntax errors found in the input. Returns an empty array if the content is valid.

Parameters:

  • string (String) —

    INI content

Returns:

  • (Array<Hash{Symbol => Object}>) —

    validation errors



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# File 'lib/philiprehberger/ini_parser.rb', line 185

def self.validate(string)
  errors = []
  line_number = 0
  in_continuation = false

  string.each_line do |raw_line|
    line_number += 1
    line = raw_line.strip

    if in_continuation
      in_continuation = line.end_with?('\\')
      next
    end

    next if line.empty?
    next if line.match?(/\A\s*[;#]/)

    if line.match?(/\A\[([^\]]+)\]\z/)
      next
    end

    if line.match?(/\A([^=]+)=(.*)?\z/)
      raw_value = (line.split('=', 2)[1] || '').strip
      in_continuation = raw_value.match?(/\\\s*\z/)
      next
    end

    errors << { line: line_number, message: "invalid line: #{raw_line.chomp}" }
  end

  errors
end