Default Continuous for equations as well, and stop exporting internal names

Author: YingboMa

src/ModelingToolkit.jl

@@ -230,7 +230,7 @@ export @variables, @parameters, @constants
 export @named, @nonamespace, @namespace, extend, compose, complete
 export debug_system
 
-export Continuous, Discrete, sampletime, input_timedomain, output_timedomain
+#export Continuous, Discrete, sampletime, input_timedomain, output_timedomain
 #export has_discrete_domain, has_continuous_domain
 #export is_discrete_domain, is_continuous_domain, is_hybrid_domain
 export Sample, Hold, Shift, ShiftIndex

src/systems/clock_inference.jl

@@ -8,7 +8,7 @@ end
 function ClockInference(ts::TearingState)
     @unpack fullvars, structure = ts
     @unpack graph = structure
-    eq_domain = Vector{TimeDomain}(undef, nsrcs(graph))
+    eq_domain = TimeDomain[Continuous() for _ in 1:nsrcs(graph)]
     var_domain = Vector{TimeDomain}(undef, ndsts(graph))
     inferred = BitSet()
     for (i, v) in enumerate(fullvars)
@@ -68,7 +68,6 @@ function infer_clocks!(ci::ClockInference)
         vd = var_domain[v]
         eqs = 𝑑neighbors(graph, v)
         isempty(eqs) && continue
-        #eq = first(eqs)
         for eq in eqs
             eq_domain[eq] = vd
         end