Charts¶

Context diagram¶

Level 0 DFD¶

$digraph { node [style=filled,color="#5D8AA8", fillcolor="#5D8AA8"]; splines=ortho; nodesep=1; subgraph files { node [shape="diamond"]; "program.lisp"; "program.pyc"; "tokens.json" [label="Token definitions"]; "Grammar"; } subgraph processes { GrammarParser; Lexer; Parser; Compiler; } "program.lisp" -> Lexer [label="Program code"] "tokens.json" -> Lexer "tokens.json" -> GrammarParser Grammar -> GrammarParser GrammarParser -> Parser [label="\"check tree\""] Lexer -> Parser [label="tokens"] Grammar -> Parser [labeldistance=20] Parser -> Compiler [label="AST"] "lisp_runtime" -> Compiler Compiler -> "program.pyc" [label="Bytecode"] }$

Level 1 DFD¶

System Development Flow Chart¶

$digraph { node [style=filled,color="#5D8AA8", fillcolor="#5D8AA8"]; nodesep=1; subgraph terminal { node [shape="ellipse"]; "exit"; "entry"; } subgraph process { node [shape="box"]; "assign the slot key in the hash loaded_grammars to value"; "handle line as setting"; "key <- key upper and stripped of spaces"; "replace all newlines in rules with a single space"; "split line by ::= into key and value"; "split rules by semicolon"; "value <- value cleaned"; "value <- value joined with \"::=\""; "remove empty rules"; "line <- first rule from rules"; } subgraph flow_control { node [shape="diamond"]; "if line starts with \"%\""; "if line starts with //"; // "if rules empty"; } "entry" -> "replace all newlines in rules with a single space" -> "split rules by semicolon" -> "remove excess whitespace from rules" -> "remove empty rules" -> "if rules empty"; "if rules empty" -> "line <- first rule from rules" [label="false"] "line <- first rule from rules" -> "if line starts with \"%\"" "if line starts with \"%\"" -> "handle line as setting" [label="true"] "handle line as setting" -> "if rules empty" "if line starts with \"%\"" -> "if line starts with //" [label="false"] "if line starts with //" -> "if rules empty" [label="true"] "if line starts with //" -> "split line by ::= into key and value" [label="false"] "split line by ::= into key and value" -> "key <- key upper and stripped of spaces" -> "value <- value joined with \"::=\"" -> "value <- value cleaned" -> "assign the slot key in the hash loaded_grammars to value" -> "if rules empty" "if rules empty" -> "exit" [label="true"] }$