3 files changed, 81 insertions, 11 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..3a08e100
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+__pycache__
+parsetab.py
+parser.out
diff --git a/sci2jslex.py b/sci2jslex.py
index 7150037e..5b0fe4af 100755
--- a/sci2jslex.py
+++ b/sci2jslex.py
@@ -293,17 +293,18 @@ def t_dqstring_error(t):
 
 lexer = lex.lex()
 
-if len(sys.argv) <= 1:
-    print("Usage: %s filename" % sys.argv[0])
-    sys.exit(1)
+if __name__ == '__main__':
+    if len(sys.argv) <= 1:
+        print("Usage: %s filename" % sys.argv[0])
+        sys.exit(1)
 
-filename = sys.argv[1]
-data = ''
-with open(filename, 'r') as infile:
-    for line in infile:
-        data += line
+    filename = sys.argv[1]
+    data = ''
+    with open(filename, 'r') as infile:
+        for line in infile:
+            data += line
 
-    lexer.input(data)
+        lexer.input(data)
 
-    for tok in lexer:
-        print(tok)
+        for tok in lexer:
+            print(tok)
diff --git a/sci2jsyacc.py b/sci2jsyacc.py
new file mode 100755
index 00000000..f6ca26d5
--- /dev/null
+++ b/sci2jsyacc.py
@@ -0,0 +1,66 @@
+#!/usr/bin/python3
+
+import sys
+import ply.yacc as yacc
+
+from sci2jslex import tokens
+
+def p_expression_operator(p):
+    'expression : expression OPERATOR term'
+    p[0] = str(p[1]) + str(p[2]) + str(p[3])
+
+def p_expression_term(p):
+    'expression : term'
+    p[0] = str(p[1])
+
+def p_term_number(p):
+    'term : NUMBER'
+    p[0] = str(p[1])
+
+def p_term_var(p):
+    'term : VAR'
+    p[0] = str(p[1])
+
+def p_term_prevar(p):
+    'term : PREVAR'
+    p[0] = str(p[1])
+
+def p_term_expression(p):
+    'term : OPENBRACKET expression CLOSEBRACKET'
+    p[0] = str(p[1])
+
+def p_term_function(p):
+    'term : VAR OPENBRACKET list CLOSEBRACKET'
+    p[0] = str(p[1])
+
+def p_list_list_expression(p):
+    'list : list COMMA expression'
+    p[0] = str(p[1]) + str(p[2]) + str(p[3])
+
+def p_list_expression(p):
+    'list : expression'
+    p[0] = str(p[1])
+
+def p_list_empty(p):
+    'list : '
+    p[0] = ''
+
+def p_error(p):
+    print("Syntax error in input")
+
+if __name__ == '__main__':
+    parser = yacc.yacc()
+
+    if len(sys.argv) <= 1:
+        print("Usage: %s filename" % sys.argv[0])
+        sys.exit(1)
+
+    filename = sys.argv[1]
+    data = ''
+    with open(filename, 'r') as infile:
+        for line in infile:
+            data += line
+
+        result = parser.parse(data)
+
+        print(result)