baum: 3e93e66ff8d3 baum.1

45 Source code are plain text files with one node per line representing the tree. The indention controls in which level in the tree the node is. Indention can be made with SPACE or with TAB characters. Every character means one level.

47 Empty lines and everything vom the hash symbol (`#') to the end of the line is ignored.

49 .B An example that echoes `42':

51 .nf

52 # comment

53 print(0)

54 sum(0) #comment

55 number(40)

56 number(2)

57 .fi

61 .SH CONCEPT

63 baum programs are represented as nodes in a tree structure. Nodes are of specific kind and contain a value.

65 The tree is processed recursive starting at the root node. Every node controls it's sons and should only know them; while most nodes only use their leftmost son.

67 Each node returns a value to it's parent. The internal value of the node could be used in any useful way, but only inside the node.

69 All values in the language (return values, expected return values and in-node values) should be of the same type, so that every combination of nodes is possible.

71 Nodes can modify the tree, but should do this only on it's brothers or better only through it's rightmost brother.

74 .SH ERRORS

76 .TP

77 .BI 1

78 common error

80 .TP

81 .BI 3

82 no or more than one source file given

84 .TP

85 .BI 4

86 invalid node

88 .TP