import json

import bmesh
import bpy

def main(context):
    print(context.object.data)
    print(type(context.object.data))
    print(dir(context.object.data))

    if context.object.mode == 'OBJECT':
        bpy.ops.object.mode_set(mode='EDIT')

    m = context.object.data
    b = bmesh.from_edit_mesh(m)

    print("info:")

    data = {}
    print("verts:")
    for vert in b.verts:
        print(" ", vert.index, ":", list(vert.co))
    data['vertices'] = [list(vert.co) for vert in b.verts]

    print("edges for vert:")
    for vert in b.verts:
        print("  ", vert.index, ":", [e.index for e in vert.link_edges])
    print("faces for vert:")
    for vert in b.verts:
        print("  ", vert.index, ":", [e.index for e in vert.link_faces])

    print("edges:")
    edges = []
    for edge in b.edges:
        print(" ", edge.index, ":", [v.index for v in edge.verts])
        edges.append([v.index for v in edge.verts])
    data['edges'] = edges

    print("faces for edge:")
    for edge in b.edges:
        print("  ", edge.index, ":", [f.index for f in edge.link_faces])


    print("faces:")
    faces = []
    for face in b.faces:
        print(" ", face.index, ":", [v.index for v in face.verts])
        faces.append([v.index for v in face.verts])
    data['faces'] = faces

    print("edges for face:")
    for face in b.faces:
        print("  ", face.index, ":", [e.index for e in face.edges])


    print(json.dumps(data))
    bpy.ops.object.mode_set(mode='OBJECT')

class DumpMesh(bpy.types.Operator):
    '''dump mesh for surfaces'''
    bl_idname = 'object.dump_mesh'
    bl_label = 'Dump Mesh'

    @classmethod
    def poll(cls, context):
        return context.active_object is not None

    def execute(self, context):
        main(context)
        return {'FINISHED'}


def register():
    bpy.utils.register_class(DumpMesh)


def unregister():
    bpy.utils.unregister_class(DumpMesh)


if __name__ == '__main__':
    register()
    bpy.ops.object.dump_mesh()