package toml // tomlType represents any Go type that corresponds to a TOML type. // While the first draft of the TOML spec has a simplistic type system that // probably doesn't need this level of sophistication, we seem to be militating // toward adding real composite types. type tomlType interface { typeString() string } // typeEqual accepts any two types and returns true if they are equal. func typeEqual(t1, t2 tomlType) bool { if t1 == nil || t2 == nil { return false } return t1.typeString() == t2.typeString() } func typeIsHash(t tomlType) bool { return typeEqual(t, tomlHash) || typeEqual(t, tomlArrayHash) } type tomlBaseType string func (btype tomlBaseType) typeString() string { return string(btype) } func (btype tomlBaseType) String() string { return btype.typeString() } var ( tomlInteger tomlBaseType = "Integer" tomlFloat tomlBaseType = "Float" tomlDatetime tomlBaseType = "Datetime" tomlString tomlBaseType = "String" tomlBool tomlBaseType = "Bool" tomlArray tomlBaseType = "Array" tomlHash tomlBaseType = "Hash" tomlArrayHash tomlBaseType = "ArrayHash" ) // typeOfPrimitive returns a tomlType of any primitive value in TOML. // Primitive values are: Integer, Float, Datetime, String and Bool. // // Passing a lexer item other than the following will cause a BUG message // to occur: itemString, itemBool, itemInteger, itemFloat, itemDatetime. func (p *parser) typeOfPrimitive(lexItem item) tomlType { switch lexItem.typ { case itemInteger: return tomlInteger case itemFloat: return tomlFloat case itemDatetime: return tomlDatetime case itemString: return tomlString case itemMultilineString: return tomlString case itemRawString: return tomlString case itemRawMultilineString: return tomlString case itemBool: return tomlBool } p.bug("Cannot infer primitive type of lex item '%s'.", lexItem) panic("unreachable") } // typeOfArray returns a tomlType for an array given a list of types of its // values. // // In the current spec, if an array is homogeneous, then its type is always // "Array". If the array is not homogeneous, an error is generated. func (p *parser) typeOfArray(types []tomlType) tomlType { // Empty arrays are cool. if len(types) == 0 { return tomlArray } theType := types[0] for _, t := range types[1:] { if !typeEqual(theType, t) { p.panicf("Array contains values of type '%s' and '%s', but "+ "arrays must be homogeneous.", theType, t) } } return tomlArray }