WIP - very basic grammar

src/diagrams/gitGraph/parser/gitGraph.jison

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+
+/*
+ * Parse following
+ * gitGraph:
+ *  commit
+ *  commit
+ *  branch 
+ */
+%lex
+
+%options case-insensitive
+
+%%
+
+[\n]+                           return 'NL';
+\s+                             /* skip all whitespace */
+\#[^\n]*                        /* skip comments */
+\%%[^\n]*                       /* skip comments */
+"gitGraph"                      return 'GG';
+"commit"                        return 'COMMIT';
+"branch"                        return 'BRANCH';
+"merge"                         return 'MERGE';
+"reset"                         return 'RESET';
+":" return ':';
+[a-zA-Z][a-zA-Z0-9_]+           return 'ID';
+<<EOF>>                         return 'EOF';
+
+/lex
+
+%left '^'
+
+%start start
+
+%% /* language grammar */
+
+start
+    : GG ':' document EOF{ return $3; }
+    ;
+
+document
+    : /* empty */ {$$ =[]}
+    | document line {$1.push($2); $$ = $1}
+    ;
+
+line
+    : statement {$$ =$1}
+    | NL
+    ;
+
+statement
+    : COMMIT
+    | BRANCH ID
+    | MERGE ID
+;
+