keyword represents a special marker of the input: each (trimmed, non-empty) line of the input must start with a keywords.

itemType defines the kind of lexed item https://talks.golang.org/2011/lex.slide#9

ErrConfigAlreadyLoaded is returned by LoadConfig, if the given config name is already present.

ErrSectionNotFound is returned by Get

ErrSectionTypeMismatch is returned by AddSection if the section-to-add already exists with a different type.

ErrUnknownOptionType is returned when trying to parse an invalid OptionType.

Tree defines the base directory for UCI config files. The default value on OpenWrt devices point to /etc/config, so that is what the default tree uses

NOTE: config, section and option types basically are AST nodes for the parser. The JSON struct tags are mainly for development and testing purposes: W

item represents a lexeme (token) https://talks.golang.org/2011/lex.slide#8

lexer holds the state of the scanner. https://talks.golang.org/2011/lex.slide#22

mockTree implements the Tree interface and an instance replaces the global defaultTree (see TestMain).

An Option is the key to one or more values. Multiple values indicate a list option.

scanner is intertwined with lexer and groups lexemes into token (which is a typed list of items). Refer to the implementation of lexer for hints abou

A section represents a group of options in UCI. It may be named or unnamed. In the latter case, its synthetic name is constructed from the section typ

stateFn represents the state of the scanner as a function that returns the next state. https://talks.golang.org/2011/lex.slide#19, #27 and following

tmpFile is used by *tree.saveConfig to create/update a config file.