From af80858e888c5f36979da88fcb1080de7b848967 Mon Sep 17 00:00:00 2001
From: David Beazley <dave@dabeaz.com>
Date: Thu, 27 Oct 2022 13:44:12 -0500
Subject: Reorganization. Added makefile

---
 tests/yacc_error6.py | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 tests/yacc_error6.py

(limited to 'tests/yacc_error6.py')

diff --git a/tests/yacc_error6.py b/tests/yacc_error6.py
new file mode 100644
index 0000000..fde3c4d
--- /dev/null
+++ b/tests/yacc_error6.py
@@ -0,0 +1,77 @@
+# -----------------------------------------------------------------------------
+# yacc_error6.py
+#
+# Panic mode recovery test
+# -----------------------------------------------------------------------------
+import ply.yacc as yacc
+
+from calclex import tokens
+
+# Parsing rules
+precedence = (
+    ('left','PLUS','MINUS'),
+    ('left','TIMES','DIVIDE'),
+    ('right','UMINUS'),
+    )
+
+def p_statements(t):
+    'statements : statements statement'
+    pass
+
+def p_statements_1(t):
+    'statements : statement'
+    pass
+
+def p_statement_assign(p):
+    'statement : LPAREN NAME EQUALS expression RPAREN'
+    print("%s=%s" % (p[2],p[4]))
+
+def p_statement_expr(t):
+    'statement : LPAREN expression RPAREN'
+    print(t[1])
+
+def p_expression_binop(t):
+    '''expression : expression PLUS expression
+                  | expression MINUS expression
+                  | expression TIMES expression
+                  | expression DIVIDE expression'''
+    if t[2] == '+'  : t[0] = t[1] + t[3]
+    elif t[2] == '-': t[0] = t[1] - t[3]
+    elif t[2] == '*': t[0] = t[1] * t[3]
+    elif t[2] == '/': t[0] = t[1] / t[3]
+
+def p_expression_uminus(t):
+    'expression : MINUS expression %prec UMINUS'
+    t[0] = -t[2]
+
+def p_expression_number(t):
+    'expression : NUMBER'
+    t[0] = t[1]
+
+def p_error(p):
+    if p:
+        print("Line %d: Syntax error at '%s'" % (p.lineno, p.value))
+    # Scan ahead looking for a name token
+    while True:
+        tok = parser.token()
+        if not tok or tok.type == 'RPAREN':
+            break
+    if tok:
+        parser.restart()
+    return None
+
+parser = yacc.yacc()
+import calclex
+calclex.lexer.lineno=1
+
+parser.parse("""
+(a = 3 + 4)
+(b = 4 + * 5 - 6 + *)
+(c = 10 + 11)
+""")
+
+
+
+
+
+
-- 
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