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-rw-r--r--src/__init__.py38
-rw-r--r--src/front/__init__.py38
-rw-r--r--src/front/lexer.py2
-rw-r--r--src/front/parser.py5
4 files changed, 43 insertions, 40 deletions
diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..747efde
--- /dev/null
+++ b/src/__init__.py
@@ -0,0 +1,38 @@
+from front.lexer import Lexer
+from front.parser import Parser
+#from front.symbols import SymbolTable
+
+def main():
+ source = '''fun fib[a]
+ if a < 2
+ @1
+ end
+ @( fib[a-1] + fib[a-2] )
+end
+
+# main function
+fun main[]
+ sum = 0
+ i = 0
+ while (i < 10)
+ sum = sum + fib[i]
+ i = i + 1
+ end
+ @sum
+end'''
+
+ #symbols = SymbolTable()
+ #lex = Lexer(source)
+
+ # testing
+ #while True:
+ # token = lex.scan()
+ # print token.__repr__()
+ # if not token:
+ # break
+
+ parse = Parser(Lexer(source))
+ print parse.parse()
+
+if __name__ == "__main__":
+ main()
diff --git a/src/front/__init__.py b/src/front/__init__.py
index 747efde..e69de29 100644
--- a/src/front/__init__.py
+++ b/src/front/__init__.py
@@ -1,38 +0,0 @@
-from front.lexer import Lexer
-from front.parser import Parser
-#from front.symbols import SymbolTable
-
-def main():
- source = '''fun fib[a]
- if a < 2
- @1
- end
- @( fib[a-1] + fib[a-2] )
-end
-
-# main function
-fun main[]
- sum = 0
- i = 0
- while (i < 10)
- sum = sum + fib[i]
- i = i + 1
- end
- @sum
-end'''
-
- #symbols = SymbolTable()
- #lex = Lexer(source)
-
- # testing
- #while True:
- # token = lex.scan()
- # print token.__repr__()
- # if not token:
- # break
-
- parse = Parser(Lexer(source))
- print parse.parse()
-
-if __name__ == "__main__":
- main()
diff --git a/src/front/lexer.py b/src/front/lexer.py
index ff67e6d..f2810cd 100644
--- a/src/front/lexer.py
+++ b/src/front/lexer.py
@@ -4,7 +4,7 @@ from token import *
class Lexer:
def __init__(self, source):
- self.source = source.splitlines()
+ self.source = (source + "\n\n").splitlines()
self.source.reverse()
self.line = 0
self.doubleNewlineCheck = False
diff --git a/src/front/parser.py b/src/front/parser.py
index 9e738d3..29e300d 100644
--- a/src/front/parser.py
+++ b/src/front/parser.py
@@ -23,6 +23,9 @@ class Parser:
raise Exception(msg)
def match(self, tag):
+ if self.token == None:
+ self.error("Unexpected end of file.")
+
if self.token.tag != tag:
self.error("match: expected %s got %s\n" %(tag, self.token.tag))
val = self.token.value
@@ -155,7 +158,7 @@ class Parser:
# function_list = function { function }.
def function_list(self):
funcs = [self.function()]
- while self.token != None:
+ while self.token:
funcs.append(self.function())
return funcs