first draft degree parser

degrees.py

@@ -1,5 +1,5 @@
 from lark import Lark, Transformer, v_args
-
+import json
 
 
 
@@ -13,57 +13,57 @@ consist of groups of courses that must be taken. The groups have rules associate
 
 
 
-grammar = """
-    start: program
 
-    program: course_declaration*
-
-    course_declaration: "course" CNAME INT "prerequisites" (CNAME ","?)* "degree" CNAME "{" degree_rule* "}"
-
-    degree_rule: "take" ("all" | "at" INT "from") ("the" "following") "courses" course_list
-
-    course_list: (CNAME ","?)*
-
-    %import common.CNAME
-    %import common.INT
-    %import common.WS
-    %ignore WS
-"""
 
 class Course:
-    def __init__(self, name, units, prerequisites, degree):
+    def __init__(self, name, units, prerequisites=[]):
         self.name = name
         self.units = units
         self.prerequisites = prerequisites
-        self.degree = degree
+    def __repr__(self):
+        return f"{self.name} ({self.units} units)"
 
 class DegreeRule:
-    def __init__(self, verb, n, course_list):
+    def __init__(self, rule_type, course_list):
-        self.verb = verb
+        self.rule_type = rule_type
-        self.n = n
+        if 'n' in rule_type.__dict__: self.n = rule_type.n 
         self.course_list = course_list
+    def __repr__(self):
+        return f"DegreeRule({self.rule_type}, {self.course_list})"
 
 class Degree:
     def __init__(self, name, degree_rules):
         self.name = name
         self.degree_rules = degree_rules
+    def __repr__(self):
+        return f"Degree({self.name}, {self.degree_rules})"
+
+class RuleType():
+    def __init__(self,what,n=0):
+        self.what = what
+        self.n = n
+    def __repr__(self):
+        return "" #f"RuleType({self.what}, {self.n})"
 
 class Rule:
     pass
 
 class TakeAll(Rule):
-    def __init__(self, courses):
+    def __repr__(self):
-        self.courses = courses
+        return f"Take all:"
 
 class TakeN(Rule):
-    def __init__(self, courses, n):
+    def __init__(self, n):
-        self.courses = courses
         self.n = n
+    def __repr__(self):
+        return f"Take {self.n} courses:"
 
 class TakeNUnits(Rule):
-    def __init__(self, courses, n):
+    def __init__(self, n):
-        self.courses = courses
         self.n = n
+    def __repr__(self):
+        return f"Take {self.n} units:"
+
 
 @v_args(inline=True)
 class DSLTransformer(Transformer):
@@ -71,38 +71,44 @@ class DSLTransformer(Transformer):
         self.courses = {}
         self.degrees = {}
 
-    def course_declaration(self, name, units, prerequisites, degree):
+    def course_declaration(self, name, units):
-        return Course(name, int(units), prerequisites.children, degree)
+        #return Course(name, int(units), prerequisites.children)
+        self.courses[name.value] = Course(name.value, int(units))
 
-    def degree(self, name, required_courses):
+    '''def program(self, name, rules):
-        self.degrees[name] = Degree(name, required_courses)
+        self.degrees[name.value] = Degree(name.value, rules)
+        return self.degrees[name.value]'''
 
-    def take_all(self, courses):
+    def rule_type(self, items):
-        return TakeAll(courses)
+        what = items[0]
-
-    def take_n(self, courses, n):
-        return TakeN(courses, n)
-
-    def take_n_units(self, courses, n):
-        return TakeNUnits(courses, n)
-    
-    def degree_rule(self, items):
-        verb = items[0]
         n = None
-        course_list = items[-1]
+        if len(items) == 2:
-        if len(items) == 4:
+            n = int(items[1])
-            n = int(items[2])
+        return RuleType(what, n)
-        return DegreeRule(verb, n, course_list.children)
     
-    def course_list(self, items):
+    def take_all(self):
-        return items[:-1]
+        return TakeAll()
 
-    def program(self, items):
+    def take_n_courses(self, n):
-        courses = [item for item in items if isinstance(item, Course)]
+        return TakeN(n)
-        degrees = [item for item in items if isinstance(item, Degree)]
-        return courses, degrees
 
+    def take_n_units(self, n):
+        return TakeNUnits(n)
     
+    def degree_rule(self, rule_type, course_list):
+        return DegreeRule(rule_type, course_list)
+
+    def course_list(self, *courses):
+        return [c.value for c in courses]
+    
+    def program(self, *items):
+        #print(items)
+        name = items[0].value
+        rules = items[1:]
+        self.degrees[name] = Degree(name, rules)
+        return self.degrees[name]
+
+"""
 dsl = DSLTransformer()
 dsl.course('CS101', 3)
 dsl.course('CS102', 3, prerequisites=['CS101'])
@@ -115,11 +121,65 @@ dsl.degree('CS', [
 
 print(dsl.courses)
 print(dsl.degrees)
+"""
 
 
 
 
 
+
+
+
+grammar = """
+    start: _spec+
+    
+    _spec: program | course_declaration
+
+    program: "program" PROGRAMNAME degree_rule*
+
+    degree_rule: "take" rule_type course_list
+
+    rule_type: "all from"                           -> take_all
+                | "at least" INT "units from"       -> take_n_units
+                | "at least" INT "courses from"     -> take_n_courses
+
+    course_declaration: "course" COURSECODE INT "units" ["prerequisites" (COURSECODE ","?)*]
+
+    course_list: (COURSECODE ","?)*
+
+    COURSECODE: ("A".."Z")+ INT+ ["A".."Z"]*
+    PROGRAMNAME: ("A".."Z" | "a".."z")+
+    %import common.INT
+    %import common.WS
+    %ignore WS
+"""
+
+
+
+dsl = """
+course CSIS1 2 units
+course CSIS2 4 units
+course ACCT120 3 units
+course ACCT20 4 units
+course BUS1 3 units
+course ENGL250 3 units
+course ACCT105 3 units
+course ACCT121 3 units
+course BOT100 3 units
+course BOT105B 3 units
+
+program BusinessAccountingOption 
+    take all from CSIS1, CSIS2
+    take at least 6 units from ACCT120, ACCT20
+    take at least 3 courses from BUS1, ENGL250, ACCT120, BOT100, ACCT121, BOT105B
+"""
+
+parser = Lark(grammar)
+print(parser.parse(dsl).pretty())
+
+print("\n\n\n")
+
+
 parser = Lark(grammar)
 transformer = DSLTransformer()
 
@@ -127,24 +187,19 @@ def parse_dsl(dsl):
     tree = parser.parse(dsl)
     return transformer.transform(tree)
 
-dsl = """
+
-course CS101 3 prerequisites none degree CS {
+result = parse_dsl(dsl)
-    take all the following courses {
+
-        CS102, CS103
+print(transformer.courses)
-    }
+print()
-    take at least 6 from {
+print(transformer.degrees)
-        MATH101, MATH102, MATH103
+print()
-    }
+[print(c) for c in transformer.courses]
-}
+print()
+[print(d) for d in transformer.degrees]
+
 """
 
-courses, degrees = parse_dsl(dsl)
-print(courses)
-print(degrees)
-
-
-
-
 
 def compute_degree_progress(student_courses, degree):
     total_units_completed = 0
@@ -162,3 +217,4 @@ def compute_degree_progress(student_courses, degree):
     progress_percent = total_units_completed / total_required_units * 100 if total_required_units > 0 else 0
     return progress_percent
 
+"""