genset: create a prototype C code generator.

support/genset/genset.py

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+"""Example of a parser that handles a subset of C and can extract
+structs and typedefs for later generation.
+
+See test.h for example input.
+"""
+
+import fileinput
+import pprint
+from pyparsing import *
+
+struct = Keyword('struct')
+lbrace = Literal('{')
+rbrace = Literal('}')
+semi = Literal(';')
+identifier = Word(alphas, alphanums + '_')
+typedef = Keyword('typedef')
+
+comment = Literal('//').suppress() + restOfLine
+comments = Group(OneOrMore(comment))
+
+type_alias = Optional(comments) + typedef + identifier + identifier
+
+field_def = Optional(comments) + identifier + identifier + semi
+
+struct_def = struct + Optional(identifier) + lbrace + OneOrMore(field_def) + rbrace
+
+typedef_def = Optional(comments) + typedef + struct_def + identifier
+
+bnf = ZeroOrMore((struct_def | typedef_def | type_alias) + semi)
+
+def main():
+    for v in bnf.scanString('\n'.join(fileinput.input())):
+        results, start, end = v
+        results.pprint()
+
+if __name__ == '__main__':
+    main()

support/genset/test.h

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+// Typedef to allow reuse of ranges and units.
+// range: 1000...2000; units: ns
+typedef int16_t servoDrive_t;
+
+// Comment
+// and more
+typedef struct servoParam_s2 {
+    // Short description.  Longer description to show in detailed
+    // help.  Basics are inherited from the typedef.
+    //
+    // default: 1000
+    servoDrive_t min;
+    // default: 2000
+    servoDrive_t max;
+    // default: 1500
+    servoDrive_t mid;
+} foo_t;