src/tools/vppapigen/vppapigen_json.py

# JSON generation
import json
import sys
import os

process_imports = True


def walk_imports(s):
    r = []
    for e in s:
        r.append(str(e))
    return r


def walk_counters(s, pathset):
    r = []
    for e in s:
        r2 = {"name": e.name, "elements": e.block}
        r.append(r2)

    r3 = []
    for p in pathset:
        r3.append(p.paths)

    return r, r3


def walk_enums(s):
    r = []
    for e in s:
        d = []
        d.append(e.name)
        for b in e.block:
            d.append(b)
        d.append({"enumtype": e.enumtype})
        r.append(d)
    return r


def walk_services(s):
    r = {}
    for e in s:
        d = {"reply": e.reply}
        if e.stream:
            d["stream"] = True
        if e.stream_message:
            d["stream_msg"] = e.stream_message
        if e.events:
            d["events"] = e.events
        r[e.caller] = d
    return r


def walk_defs(s, is_message=False):
    r = []
    for t in s:
        d = []
        d.append(t.name)
        for b in t.block:
            if b.type == "Option":
                continue
            if b.type == "Field":
                if b.limit:
                    d.append([b.fieldtype, b.fieldname, b.limit])
                else:
                    d.append([b.fieldtype, b.fieldname])
            elif b.type == "Array":
                if b.lengthfield:
                    d.append([b.fieldtype, b.fieldname, b.length, b.lengthfield])
                else:
                    d.append([b.fieldtype, b.fieldname, b.length])
            elif b.type == "Union":
                pass
            else:
                raise ValueError("Error in processing array type %s" % b)

        if is_message and t.crc:
            c = {}
            c["crc"] = "{0:#0{1}x}".format(t.crc, 10)
            c["options"] = t.options
            if t.comment:
                c["comment"] = t.comment
            d.append(c)

        r.append(d)
    return r


#
# Plugin entry point
#


def contents_to_c_string(contents):
    # Escape backslashes and double quotes
    contents = contents.replace("\\", "\\\\").replace('"', '\\"')
    # Replace newlines with \n
    contents = contents.replace("\n", "\\n")
    return '"' + contents + '"'


def run(output_dir, apifilename, s):
    if not output_dir:
        sys.stderr.write("Missing --outputdir argument")
        return None

    basename = os.path.basename(apifilename)
    filename_json_repr = os.path.join(output_dir + "/" + basename + "_json.h")
    filename, _ = os.path.splitext(basename)
    modulename = filename.replace(".", "_")

    j = {}

    j["types"] = walk_defs([o for o in s["types"] if o.__class__.__name__ == "Typedef"])
    j["messages"] = walk_defs(s["Define"], True)
    j["unions"] = walk_defs([o for o in s["types"] if o.__class__.__name__ == "Union"])
    j["enums"] = walk_enums([o for o in s["types"] if o.__class__.__name__ == "Enum"])
    j["enumflags"] = walk_enums(
        [o for o in s["types"] if o.__class__.__name__ == "EnumFlag"]
    )
    j["services"] = walk_services(s["Service"])
    j["options"] = s["Option"]
    j["aliases"] = {
        o.name: o.alias for o in s["types"] if o.__class__.__name__ == "Using"
    }
    j["vl_api_version"] = hex(s["file_crc"])
    j["imports"] = walk_imports(i for i in s["Import"])
    j["counters"], j["paths"] = walk_counters(s["Counters"], s["Paths"])
    r = json.dumps(j, indent=4, separators=(",", ": "))
    c_string = contents_to_c_string(r)
    with open(filename_json_repr, "w", encoding="UTF-8") as f:
        print(f"const char *json_api_repr_{modulename} = {c_string};", file=f)
    # return json.dumps(j, indent=4, separators=(",", ": "))
    return r