Minor datatype changes

src/datatypes/DataTypes.jl

@@ -3,7 +3,7 @@
 # Enumerated types
 @enum Degree AA AS AAS BA BS
 @enum System semester quarter
-@enum Requisite pre co strict_co
+@enum Requisite pre co strict_co custom
 @enum EdgeClass tree_edge back_edge forward_edge cross_edge
 
 # fundamental data types for curricular analytics
@@ -13,26 +13,4 @@ include("curriculum.jl")
 include("degreeplan.jl")
 
 # additional types
-include("coursecatalog.jl")
-
-# Returns a requisite as a string
-function requisite_to_string(req::Requisite)
-    if req == pre
-        return "CurriculumPrerequisite"
-    elseif req == co
-        return "CurriculumCorequisite"
-    else
-        return "CurriculumStrictCorequisite"
-    end
-end
-
-# Returns a requisite (enumerated type) from a string
-function string_to_requisite(req::String)
-    if (req == "prereq" || req == "CurriculumPrerequisite")
-        return pre
-    elseif (req == "coreq" || req == "CurriculumCorequisite")
-        return co
-    elseif (req == "strict-coreq" || req == "CurriculumStrictCorequisite")
-        return strict_co
-    end
-end
+include("coursecatalog.jl")

src/datatypes/course.jl

@@ -61,6 +61,7 @@ mutable struct Course
         this.cross_listed = cross_listed
         this.canonical_name = canonical_name
         this.requisites = Dict{Int, Requisite}()
+        #this.requisite_formula
         this.metrics = Dict{String, Any}()
         this.metadata = Dict{String, Any}()
         this.learning_outcomes = learning_outcomes
@@ -70,7 +71,7 @@ mutable struct Course
 end
 
 function course_id(prefix::AbstractString, num::AbstractString, name::AbstractString, institution::AbstractString)
-    mod(hash(name * prefix * num * institution), UInt32)
+    convert(Int, mod(hash(name * prefix * num * institution), UInt32))
 end
 
 """

src/datatypes/coursecatalog.jl

@@ -6,17 +6,17 @@ mutable struct CourseCatalog
     name::AbstractString                # Name of the course catalog
     institution::AbstractString         # Institution offering the courses in the catalog 
     date_range::Tuple                   # range of dates the catalog is applicable over
-    catalog::Dict{UInt32, Course}       # dictionary of courses in (course_id, course) format
+    catalog::Dict{Int, Course}       # dictionary of courses in (course_id, course) format
 
     # Constructor
     function CourseCatalog(name::AbstractString, institution::AbstractString; courses::Array{Course}=Array{Course,1}(), 
-                   catalog::Dict{UInt32,Course}=Dict{UInt32,Course}(), date_range::Tuple=(), id::Int=0)
+                   catalog::Dict{Int,Course}=Dict{Int,Course}(), date_range::Tuple=(), id::Int=0)
         this = new()
         this.name = name
         this.institution = institution
         this.catalog = catalog
         this.date_range = date_range
-        this.id = id
+        this.id = mod(hash(this.name * this.institution), UInt32)
         length(courses) > 0 ? add_course!(this, courses) : nothing
         return this
     end
@@ -37,8 +37,9 @@ function is_duplicate(cc::CourseCatalog, course::Course)
     course.id in keys(cc.catalog) ? true : false
 end 
 
-function course(cc::CourseCatalog, prefix::AbstractString, num::AbstractString, name::AbstractString, institution::AbstractString)
-    hash_val = mod(hash(name * prefix * num * institution), UInt32)
+# Return a course in a course catalog
+function course(cc::CourseCatalog, prefix::AbstractString, num::AbstractString, name::AbstractString)
+    hash_val = mod(hash(name * prefix * num * cc.institution), UInt32)
     if hash_val in keys(cc.catalog)
         return cc.catalog[hash_val]
     else