3 files changed, 1218 insertions, 0 deletions
diff --git a/third_party/python/ply/example/ansic/README b/third_party/python/ply/example/ansic/README
new file mode 100644
index 0000000000..e049d3b4e4
--- /dev/null
+++ b/third_party/python/ply/example/ansic/README
@@ -0,0 +1,2 @@
+This example is incomplete.  Was going to specify an ANSI C parser.
+This is part of it.
diff --git a/third_party/python/ply/example/ansic/clex.py b/third_party/python/ply/example/ansic/clex.py
new file mode 100644
index 0000000000..4bde1d730b
--- /dev/null
+++ b/third_party/python/ply/example/ansic/clex.py
@@ -0,0 +1,168 @@
+# ----------------------------------------------------------------------
+# clex.py
+#
+# A lexer for ANSI C.
+# ----------------------------------------------------------------------
+
+import sys
+sys.path.insert(0, "../..")
+
+import ply.lex as lex
+
+# Reserved words
+reserved = (
+    'AUTO', 'BREAK', 'CASE', 'CHAR', 'CONST', 'CONTINUE', 'DEFAULT', 'DO', 'DOUBLE',
+    'ELSE', 'ENUM', 'EXTERN', 'FLOAT', 'FOR', 'GOTO', 'IF', 'INT', 'LONG', 'REGISTER',
+    'RETURN', 'SHORT', 'SIGNED', 'SIZEOF', 'STATIC', 'STRUCT', 'SWITCH', 'TYPEDEF',
+    'UNION', 'UNSIGNED', 'VOID', 'VOLATILE', 'WHILE',
+)
+
+tokens = reserved + (
+    # Literals (identifier, integer constant, float constant, string constant,
+    # char const)
+    'ID', 'TYPEID', 'ICONST', 'FCONST', 'SCONST', 'CCONST',
+
+    # Operators (+,-,*,/,%,|,&,~,^,<<,>>, ||, &&, !, <, <=, >, >=, ==, !=)
+    'PLUS', 'MINUS', 'TIMES', 'DIVIDE', 'MOD',
+    'OR', 'AND', 'NOT', 'XOR', 'LSHIFT', 'RSHIFT',
+    'LOR', 'LAND', 'LNOT',
+    'LT', 'LE', 'GT', 'GE', 'EQ', 'NE',
+
+    # Assignment (=, *=, /=, %=, +=, -=, <<=, >>=, &=, ^=, |=)
+    'EQUALS', 'TIMESEQUAL', 'DIVEQUAL', 'MODEQUAL', 'PLUSEQUAL', 'MINUSEQUAL',
+    'LSHIFTEQUAL', 'RSHIFTEQUAL', 'ANDEQUAL', 'XOREQUAL', 'OREQUAL',
+
+    # Increment/decrement (++,--)
+    'PLUSPLUS', 'MINUSMINUS',
+
+    # Structure dereference (->)
+    'ARROW',
+
+    # Conditional operator (?)
+    'CONDOP',
+
+    # Delimeters ( ) [ ] { } , . ; :
+    'LPAREN', 'RPAREN',
+    'LBRACKET', 'RBRACKET',
+    'LBRACE', 'RBRACE',
+    'COMMA', 'PERIOD', 'SEMI', 'COLON',
+
+    # Ellipsis (...)
+    'ELLIPSIS',
+)
+
+# Completely ignored characters
+t_ignore = ' \t\x0c'
+
+# Newlines
+
+
+def t_NEWLINE(t):
+    r'\n+'
+    t.lexer.lineno += t.value.count("\n")
+
+# Operators
+t_PLUS = r'\+'
+t_MINUS = r'-'
+t_TIMES = r'\*'
+t_DIVIDE = r'/'
+t_MOD = r'%'
+t_OR = r'\|'
+t_AND = r'&'
+t_NOT = r'~'
+t_XOR = r'\^'
+t_LSHIFT = r'<<'
+t_RSHIFT = r'>>'
+t_LOR = r'\|\|'
+t_LAND = r'&&'
+t_LNOT = r'!'
+t_LT = r'<'
+t_GT = r'>'
+t_LE = r'<='
+t_GE = r'>='
+t_EQ = r'=='
+t_NE = r'!='
+
+# Assignment operators
+
+t_EQUALS = r'='
+t_TIMESEQUAL = r'\*='
+t_DIVEQUAL = r'/='
+t_MODEQUAL = r'%='
+t_PLUSEQUAL = r'\+='
+t_MINUSEQUAL = r'-='
+t_LSHIFTEQUAL = r'<<='
+t_RSHIFTEQUAL = r'>>='
+t_ANDEQUAL = r'&='
+t_OREQUAL = r'\|='
+t_XOREQUAL = r'\^='
+
+# Increment/decrement
+t_PLUSPLUS = r'\+\+'
+t_MINUSMINUS = r'--'
+
+# ->
+t_ARROW = r'->'
+
+# ?
+t_CONDOP = r'\?'
+
+# Delimeters
+t_LPAREN = r'\('
+t_RPAREN = r'\)'
+t_LBRACKET = r'\['
+t_RBRACKET = r'\]'
+t_LBRACE = r'\{'
+t_RBRACE = r'\}'
+t_COMMA = r','
+t_PERIOD = r'\.'
+t_SEMI = r';'
+t_COLON = r':'
+t_ELLIPSIS = r'\.\.\.'
+
+# Identifiers and reserved words
+
+reserved_map = {}
+for r in reserved:
+    reserved_map[r.lower()] = r
+
+
+def t_ID(t):
+    r'[A-Za-z_][\w_]*'
+    t.type = reserved_map.get(t.value, "ID")
+    return t
+
+# Integer literal
+t_ICONST = r'\d+([uU]|[lL]|[uU][lL]|[lL][uU])?'
+
+# Floating literal
+t_FCONST = r'((\d+)(\.\d+)(e(\+|-)?(\d+))? | (\d+)e(\+|-)?(\d+))([lL]|[fF])?'
+
+# String literal
+t_SCONST = r'\"([^\\\n]|(\\.))*?\"'
+
+# Character constant 'c' or L'c'
+t_CCONST = r'(L)?\'([^\\\n]|(\\.))*?\''
+
+# Comments
+
+
+def t_comment(t):
+    r'/\*(.|\n)*?\*/'
+    t.lexer.lineno += t.value.count('\n')
+
+# Preprocessor directive (ignored)
+
+
+def t_preprocessor(t):
+    r'\#(.)*?\n'
+    t.lexer.lineno += 1
+
+
+def t_error(t):
+    print("Illegal character %s" % repr(t.value[0]))
+    t.lexer.skip(1)
+
+lexer = lex.lex()
+if __name__ == "__main__":
+    lex.runmain(lexer)
diff --git a/third_party/python/ply/example/ansic/cparse.py b/third_party/python/ply/example/ansic/cparse.py
new file mode 100644
index 0000000000..5fe9bce042
--- /dev/null
+++ b/third_party/python/ply/example/ansic/cparse.py
@@ -0,0 +1,1048 @@
+# -----------------------------------------------------------------------------
+# cparse.py
+#
+# Simple parser for ANSI C.  Based on the grammar in K&R, 2nd Ed.
+# -----------------------------------------------------------------------------
+
+import sys
+import clex
+import ply.yacc as yacc
+
+# Get the token map
+tokens = clex.tokens
+
+# translation-unit:
+
+
+def p_translation_unit_1(t):
+    'translation_unit : external_declaration'
+    pass
+
+
+def p_translation_unit_2(t):
+    'translation_unit : translation_unit external_declaration'
+    pass
+
+# external-declaration:
+
+
+def p_external_declaration_1(t):
+    'external_declaration : function_definition'
+    pass
+
+
+def p_external_declaration_2(t):
+    'external_declaration : declaration'
+    pass
+
+# function-definition:
+
+
+def p_function_definition_1(t):
+    'function_definition : declaration_specifiers declarator declaration_list compound_statement'
+    pass
+
+
+def p_function_definition_2(t):
+    'function_definition : declarator declaration_list compound_statement'
+    pass
+
+
+def p_function_definition_3(t):
+    'function_definition : declarator compound_statement'
+    pass
+
+
+def p_function_definition_4(t):
+    'function_definition : declaration_specifiers declarator compound_statement'
+    pass
+
+# declaration:
+
+
+def p_declaration_1(t):
+    'declaration : declaration_specifiers init_declarator_list SEMI'
+    pass
+
+
+def p_declaration_2(t):
+    'declaration : declaration_specifiers SEMI'
+    pass
+
+# declaration-list:
+
+
+def p_declaration_list_1(t):
+    'declaration_list : declaration'
+    pass
+
+
+def p_declaration_list_2(t):
+    'declaration_list : declaration_list declaration '
+    pass
+
+# declaration-specifiers
+
+
+def p_declaration_specifiers_1(t):
+    'declaration_specifiers : storage_class_specifier declaration_specifiers'
+    pass
+
+
+def p_declaration_specifiers_2(t):
+    'declaration_specifiers : type_specifier declaration_specifiers'
+    pass
+
+
+def p_declaration_specifiers_3(t):
+    'declaration_specifiers : type_qualifier declaration_specifiers'
+    pass
+
+
+def p_declaration_specifiers_4(t):
+    'declaration_specifiers : storage_class_specifier'
+    pass
+
+
+def p_declaration_specifiers_5(t):
+    'declaration_specifiers : type_specifier'
+    pass
+
+
+def p_declaration_specifiers_6(t):
+    'declaration_specifiers : type_qualifier'
+    pass
+
+# storage-class-specifier
+
+
+def p_storage_class_specifier(t):
+    '''storage_class_specifier : AUTO
+                               | REGISTER
+                               | STATIC
+                               | EXTERN
+                               | TYPEDEF
+                               '''
+    pass
+
+# type-specifier:
+
+
+def p_type_specifier(t):
+    '''type_specifier : VOID
+                      | CHAR
+                      | SHORT
+                      | INT
+                      | LONG
+                      | FLOAT
+                      | DOUBLE
+                      | SIGNED
+                      | UNSIGNED
+                      | struct_or_union_specifier
+                      | enum_specifier
+                      | TYPEID
+                      '''
+    pass
+
+# type-qualifier:
+
+
+def p_type_qualifier(t):
+    '''type_qualifier : CONST
+                      | VOLATILE'''
+    pass
+
+# struct-or-union-specifier
+
+
+def p_struct_or_union_specifier_1(t):
+    'struct_or_union_specifier : struct_or_union ID LBRACE struct_declaration_list RBRACE'
+    pass
+
+
+def p_struct_or_union_specifier_2(t):
+    'struct_or_union_specifier : struct_or_union LBRACE struct_declaration_list RBRACE'
+    pass
+
+
+def p_struct_or_union_specifier_3(t):
+    'struct_or_union_specifier : struct_or_union ID'
+    pass
+
+# struct-or-union:
+
+
+def p_struct_or_union(t):
+    '''struct_or_union : STRUCT
+                       | UNION
+                       '''
+    pass
+
+# struct-declaration-list:
+
+
+def p_struct_declaration_list_1(t):
+    'struct_declaration_list : struct_declaration'
+    pass
+
+
+def p_struct_declaration_list_2(t):
+    'struct_declaration_list : struct_declaration_list struct_declaration'
+    pass
+
+# init-declarator-list:
+
+
+def p_init_declarator_list_1(t):
+    'init_declarator_list : init_declarator'
+    pass
+
+
+def p_init_declarator_list_2(t):
+    'init_declarator_list : init_declarator_list COMMA init_declarator'
+    pass
+
+# init-declarator
+
+
+def p_init_declarator_1(t):
+    'init_declarator : declarator'
+    pass
+
+
+def p_init_declarator_2(t):
+    'init_declarator : declarator EQUALS initializer'
+    pass
+
+# struct-declaration:
+
+
+def p_struct_declaration(t):
+    'struct_declaration : specifier_qualifier_list struct_declarator_list SEMI'
+    pass
+
+# specifier-qualifier-list:
+
+
+def p_specifier_qualifier_list_1(t):
+    'specifier_qualifier_list : type_specifier specifier_qualifier_list'
+    pass
+
+
+def p_specifier_qualifier_list_2(t):
+    'specifier_qualifier_list : type_specifier'
+    pass
+
+
+def p_specifier_qualifier_list_3(t):
+    'specifier_qualifier_list : type_qualifier specifier_qualifier_list'
+    pass
+
+
+def p_specifier_qualifier_list_4(t):
+    'specifier_qualifier_list : type_qualifier'
+    pass
+
+# struct-declarator-list:
+
+
+def p_struct_declarator_list_1(t):
+    'struct_declarator_list : struct_declarator'
+    pass
+
+
+def p_struct_declarator_list_2(t):
+    'struct_declarator_list : struct_declarator_list COMMA struct_declarator'
+    pass
+
+# struct-declarator:
+
+
+def p_struct_declarator_1(t):
+    'struct_declarator : declarator'
+    pass
+
+
+def p_struct_declarator_2(t):
+    'struct_declarator : declarator COLON constant_expression'
+    pass
+
+
+def p_struct_declarator_3(t):
+    'struct_declarator : COLON constant_expression'
+    pass
+
+# enum-specifier:
+
+
+def p_enum_specifier_1(t):
+    'enum_specifier : ENUM ID LBRACE enumerator_list RBRACE'
+    pass
+
+
+def p_enum_specifier_2(t):
+    'enum_specifier : ENUM LBRACE enumerator_list RBRACE'
+    pass
+
+
+def p_enum_specifier_3(t):
+    'enum_specifier : ENUM ID'
+    pass
+
+# enumerator_list:
+
+
+def p_enumerator_list_1(t):
+    'enumerator_list : enumerator'
+    pass
+
+
+def p_enumerator_list_2(t):
+    'enumerator_list : enumerator_list COMMA enumerator'
+    pass
+
+# enumerator:
+
+
+def p_enumerator_1(t):
+    'enumerator : ID'
+    pass
+
+
+def p_enumerator_2(t):
+    'enumerator : ID EQUALS constant_expression'
+    pass
+
+# declarator:
+
+
+def p_declarator_1(t):
+    'declarator : pointer direct_declarator'
+    pass
+
+
+def p_declarator_2(t):
+    'declarator : direct_declarator'
+    pass
+
+# direct-declarator:
+
+
+def p_direct_declarator_1(t):
+    'direct_declarator : ID'
+    pass
+
+
+def p_direct_declarator_2(t):
+    'direct_declarator : LPAREN declarator RPAREN'
+    pass
+
+
+def p_direct_declarator_3(t):
+    'direct_declarator : direct_declarator LBRACKET constant_expression_opt RBRACKET'
+    pass
+
+
+def p_direct_declarator_4(t):
+    'direct_declarator : direct_declarator LPAREN parameter_type_list RPAREN '
+    pass
+
+
+def p_direct_declarator_5(t):
+    'direct_declarator : direct_declarator LPAREN identifier_list RPAREN '
+    pass
+
+
+def p_direct_declarator_6(t):
+    'direct_declarator : direct_declarator LPAREN RPAREN '
+    pass
+
+# pointer:
+
+
+def p_pointer_1(t):
+    'pointer : TIMES type_qualifier_list'
+    pass
+
+
+def p_pointer_2(t):
+    'pointer : TIMES'
+    pass
+
+
+def p_pointer_3(t):
+    'pointer : TIMES type_qualifier_list pointer'
+    pass
+
+
+def p_pointer_4(t):
+    'pointer : TIMES pointer'
+    pass
+
+# type-qualifier-list:
+
+
+def p_type_qualifier_list_1(t):
+    'type_qualifier_list : type_qualifier'
+    pass
+
+
+def p_type_qualifier_list_2(t):
+    'type_qualifier_list : type_qualifier_list type_qualifier'
+    pass
+
+# parameter-type-list:
+
+
+def p_parameter_type_list_1(t):
+    'parameter_type_list : parameter_list'
+    pass
+
+
+def p_parameter_type_list_2(t):
+    'parameter_type_list : parameter_list COMMA ELLIPSIS'
+    pass
+
+# parameter-list:
+
+
+def p_parameter_list_1(t):
+    'parameter_list : parameter_declaration'
+    pass
+
+
+def p_parameter_list_2(t):
+    'parameter_list : parameter_list COMMA parameter_declaration'
+    pass
+
+# parameter-declaration:
+
+
+def p_parameter_declaration_1(t):
+    'parameter_declaration : declaration_specifiers declarator'
+    pass
+
+
+def p_parameter_declaration_2(t):
+    'parameter_declaration : declaration_specifiers abstract_declarator_opt'
+    pass
+
+# identifier-list:
+
+
+def p_identifier_list_1(t):
+    'identifier_list : ID'
+    pass
+
+
+def p_identifier_list_2(t):
+    'identifier_list : identifier_list COMMA ID'
+    pass
+
+# initializer:
+
+
+def p_initializer_1(t):
+    'initializer : assignment_expression'
+    pass
+
+
+def p_initializer_2(t):
+    '''initializer : LBRACE initializer_list RBRACE
+                   | LBRACE initializer_list COMMA RBRACE'''
+    pass
+
+# initializer-list:
+
+
+def p_initializer_list_1(t):
+    'initializer_list : initializer'
+    pass
+
+
+def p_initializer_list_2(t):
+    'initializer_list : initializer_list COMMA initializer'
+    pass
+
+# type-name:
+
+
+def p_type_name(t):
+    'type_name : specifier_qualifier_list abstract_declarator_opt'
+    pass
+
+
+def p_abstract_declarator_opt_1(t):
+    'abstract_declarator_opt : empty'
+    pass
+
+
+def p_abstract_declarator_opt_2(t):
+    'abstract_declarator_opt : abstract_declarator'
+    pass
+
+# abstract-declarator:
+
+
+def p_abstract_declarator_1(t):
+    'abstract_declarator : pointer '
+    pass
+
+
+def p_abstract_declarator_2(t):
+    'abstract_declarator : pointer direct_abstract_declarator'
+    pass
+
+
+def p_abstract_declarator_3(t):
+    'abstract_declarator : direct_abstract_declarator'
+    pass
+
+# direct-abstract-declarator:
+
+
+def p_direct_abstract_declarator_1(t):
+    'direct_abstract_declarator : LPAREN abstract_declarator RPAREN'
+    pass
+
+
+def p_direct_abstract_declarator_2(t):
+    'direct_abstract_declarator : direct_abstract_declarator LBRACKET constant_expression_opt RBRACKET'
+    pass
+
+
+def p_direct_abstract_declarator_3(t):
+    'direct_abstract_declarator : LBRACKET constant_expression_opt RBRACKET'
+    pass
+
+
+def p_direct_abstract_declarator_4(t):
+    'direct_abstract_declarator : direct_abstract_declarator LPAREN parameter_type_list_opt RPAREN'
+    pass
+
+
+def p_direct_abstract_declarator_5(t):
+    'direct_abstract_declarator : LPAREN parameter_type_list_opt RPAREN'
+    pass
+
+# Optional fields in abstract declarators
+
+
+def p_constant_expression_opt_1(t):
+    'constant_expression_opt : empty'
+    pass
+
+
+def p_constant_expression_opt_2(t):
+    'constant_expression_opt : constant_expression'
+    pass
+
+
+def p_parameter_type_list_opt_1(t):
+    'parameter_type_list_opt : empty'
+    pass
+
+
+def p_parameter_type_list_opt_2(t):
+    'parameter_type_list_opt : parameter_type_list'
+    pass
+
+# statement:
+
+
+def p_statement(t):
+    '''
+    statement : labeled_statement
+              | expression_statement
+              | compound_statement
+              | selection_statement
+              | iteration_statement
+              | jump_statement
+              '''
+    pass
+
+# labeled-statement:
+
+
+def p_labeled_statement_1(t):
+    'labeled_statement : ID COLON statement'
+    pass
+
+
+def p_labeled_statement_2(t):
+    'labeled_statement : CASE constant_expression COLON statement'
+    pass
+
+
+def p_labeled_statement_3(t):
+    'labeled_statement : DEFAULT COLON statement'
+    pass
+
+# expression-statement:
+
+
+def p_expression_statement(t):
+    'expression_statement : expression_opt SEMI'
+    pass
+
+# compound-statement:
+
+
+def p_compound_statement_1(t):
+    'compound_statement : LBRACE declaration_list statement_list RBRACE'
+    pass
+
+
+def p_compound_statement_2(t):
+    'compound_statement : LBRACE statement_list RBRACE'
+    pass
+
+
+def p_compound_statement_3(t):
+    'compound_statement : LBRACE declaration_list RBRACE'
+    pass
+
+
+def p_compound_statement_4(t):
+    'compound_statement : LBRACE RBRACE'
+    pass
+
+# statement-list:
+
+
+def p_statement_list_1(t):
+    'statement_list : statement'
+    pass
+
+
+def p_statement_list_2(t):
+    'statement_list : statement_list statement'
+    pass
+
+# selection-statement
+
+
+def p_selection_statement_1(t):
+    'selection_statement : IF LPAREN expression RPAREN statement'
+    pass
+
+
+def p_selection_statement_2(t):
+    'selection_statement : IF LPAREN expression RPAREN statement ELSE statement '
+    pass
+
+
+def p_selection_statement_3(t):
+    'selection_statement : SWITCH LPAREN expression RPAREN statement '
+    pass
+
+# iteration_statement:
+
+
+def p_iteration_statement_1(t):
+    'iteration_statement : WHILE LPAREN expression RPAREN statement'
+    pass
+
+
+def p_iteration_statement_2(t):
+    'iteration_statement : FOR LPAREN expression_opt SEMI expression_opt SEMI expression_opt RPAREN statement '
+    pass
+
+
+def p_iteration_statement_3(t):
+    'iteration_statement : DO statement WHILE LPAREN expression RPAREN SEMI'
+    pass
+
+# jump_statement:
+
+
+def p_jump_statement_1(t):
+    'jump_statement : GOTO ID SEMI'
+    pass
+
+
+def p_jump_statement_2(t):
+    'jump_statement : CONTINUE SEMI'
+    pass
+
+
+def p_jump_statement_3(t):
+    'jump_statement : BREAK SEMI'
+    pass
+
+
+def p_jump_statement_4(t):
+    'jump_statement : RETURN expression_opt SEMI'
+    pass
+
+
+def p_expression_opt_1(t):
+    'expression_opt : empty'
+    pass
+
+
+def p_expression_opt_2(t):
+    'expression_opt : expression'
+    pass
+
+# expression:
+
+
+def p_expression_1(t):
+    'expression : assignment_expression'
+    pass
+
+
+def p_expression_2(t):
+    'expression : expression COMMA assignment_expression'
+    pass
+
+# assigment_expression:
+
+
+def p_assignment_expression_1(t):
+    'assignment_expression : conditional_expression'
+    pass
+
+
+def p_assignment_expression_2(t):
+    'assignment_expression : unary_expression assignment_operator assignment_expression'
+    pass
+
+# assignment_operator:
+
+
+def p_assignment_operator(t):
+    '''
+    assignment_operator : EQUALS
+                        | TIMESEQUAL
+                        | DIVEQUAL
+                        | MODEQUAL
+                        | PLUSEQUAL
+                        | MINUSEQUAL
+                        | LSHIFTEQUAL
+                        | RSHIFTEQUAL
+                        | ANDEQUAL
+                        | OREQUAL
+                        | XOREQUAL
+                        '''
+    pass
+
+# conditional-expression
+
+
+def p_conditional_expression_1(t):
+    'conditional_expression : logical_or_expression'
+    pass
+
+
+def p_conditional_expression_2(t):
+    'conditional_expression : logical_or_expression CONDOP expression COLON conditional_expression '
+    pass
+
+# constant-expression
+
+
+def p_constant_expression(t):
+    'constant_expression : conditional_expression'
+    pass
+
+# logical-or-expression
+
+
+def p_logical_or_expression_1(t):
+    'logical_or_expression : logical_and_expression'
+    pass
+
+
+def p_logical_or_expression_2(t):
+    'logical_or_expression : logical_or_expression LOR logical_and_expression'
+    pass
+
+# logical-and-expression
+
+
+def p_logical_and_expression_1(t):
+    'logical_and_expression : inclusive_or_expression'
+    pass
+
+
+def p_logical_and_expression_2(t):
+    'logical_and_expression : logical_and_expression LAND inclusive_or_expression'
+    pass
+
+# inclusive-or-expression:
+
+
+def p_inclusive_or_expression_1(t):
+    'inclusive_or_expression : exclusive_or_expression'
+    pass
+
+
+def p_inclusive_or_expression_2(t):
+    'inclusive_or_expression : inclusive_or_expression OR exclusive_or_expression'
+    pass
+
+# exclusive-or-expression:
+
+
+def p_exclusive_or_expression_1(t):
+    'exclusive_or_expression :  and_expression'
+    pass
+
+
+def p_exclusive_or_expression_2(t):
+    'exclusive_or_expression :  exclusive_or_expression XOR and_expression'
+    pass
+
+# AND-expression
+
+
+def p_and_expression_1(t):
+    'and_expression : equality_expression'
+    pass
+
+
+def p_and_expression_2(t):
+    'and_expression : and_expression AND equality_expression'
+    pass
+
+
+# equality-expression:
+def p_equality_expression_1(t):
+    'equality_expression : relational_expression'
+    pass
+
+
+def p_equality_expression_2(t):
+    'equality_expression : equality_expression EQ relational_expression'
+    pass
+
+
+def p_equality_expression_3(t):
+    'equality_expression : equality_expression NE relational_expression'
+    pass
+
+
+# relational-expression:
+def p_relational_expression_1(t):
+    'relational_expression : shift_expression'
+    pass
+
+
+def p_relational_expression_2(t):
+    'relational_expression : relational_expression LT shift_expression'
+    pass
+
+
+def p_relational_expression_3(t):
+    'relational_expression : relational_expression GT shift_expression'
+    pass
+
+
+def p_relational_expression_4(t):
+    'relational_expression : relational_expression LE shift_expression'
+    pass
+
+
+def p_relational_expression_5(t):
+    'relational_expression : relational_expression GE shift_expression'
+    pass
+
+# shift-expression
+
+
+def p_shift_expression_1(t):
+    'shift_expression : additive_expression'
+    pass
+
+
+def p_shift_expression_2(t):
+    'shift_expression : shift_expression LSHIFT additive_expression'
+    pass
+
+
+def p_shift_expression_3(t):
+    'shift_expression : shift_expression RSHIFT additive_expression'
+    pass
+
+# additive-expression
+
+
+def p_additive_expression_1(t):
+    'additive_expression : multiplicative_expression'
+    pass
+
+
+def p_additive_expression_2(t):
+    'additive_expression : additive_expression PLUS multiplicative_expression'
+    pass
+
+
+def p_additive_expression_3(t):
+    'additive_expression : additive_expression MINUS multiplicative_expression'
+    pass
+
+# multiplicative-expression
+
+
+def p_multiplicative_expression_1(t):
+    'multiplicative_expression : cast_expression'
+    pass
+
+
+def p_multiplicative_expression_2(t):
+    'multiplicative_expression : multiplicative_expression TIMES cast_expression'
+    pass
+
+
+def p_multiplicative_expression_3(t):
+    'multiplicative_expression : multiplicative_expression DIVIDE cast_expression'
+    pass
+
+
+def p_multiplicative_expression_4(t):
+    'multiplicative_expression : multiplicative_expression MOD cast_expression'
+    pass
+
+# cast-expression:
+
+
+def p_cast_expression_1(t):
+    'cast_expression : unary_expression'
+    pass
+
+
+def p_cast_expression_2(t):
+    'cast_expression : LPAREN type_name RPAREN cast_expression'
+    pass
+
+# unary-expression:
+
+
+def p_unary_expression_1(t):
+    'unary_expression : postfix_expression'
+    pass
+
+
+def p_unary_expression_2(t):
+    'unary_expression : PLUSPLUS unary_expression'
+    pass
+
+
+def p_unary_expression_3(t):
+    'unary_expression : MINUSMINUS unary_expression'
+    pass
+
+
+def p_unary_expression_4(t):
+    'unary_expression : unary_operator cast_expression'
+    pass
+
+
+def p_unary_expression_5(t):
+    'unary_expression : SIZEOF unary_expression'
+    pass
+
+
+def p_unary_expression_6(t):
+    'unary_expression : SIZEOF LPAREN type_name RPAREN'
+    pass
+
+# unary-operator
+
+
+def p_unary_operator(t):
+    '''unary_operator : AND
+                    | TIMES
+                    | PLUS 
+                    | MINUS
+                    | NOT
+                    | LNOT '''
+    pass
+
+# postfix-expression:
+
+
+def p_postfix_expression_1(t):
+    'postfix_expression : primary_expression'
+    pass
+
+
+def p_postfix_expression_2(t):
+    'postfix_expression : postfix_expression LBRACKET expression RBRACKET'
+    pass
+
+
+def p_postfix_expression_3(t):
+    'postfix_expression : postfix_expression LPAREN argument_expression_list RPAREN'
+    pass
+
+
+def p_postfix_expression_4(t):
+    'postfix_expression : postfix_expression LPAREN RPAREN'
+    pass
+
+
+def p_postfix_expression_5(t):
+    'postfix_expression : postfix_expression PERIOD ID'
+    pass
+
+
+def p_postfix_expression_6(t):
+    'postfix_expression : postfix_expression ARROW ID'
+    pass
+
+
+def p_postfix_expression_7(t):
+    'postfix_expression : postfix_expression PLUSPLUS'
+    pass
+
+
+def p_postfix_expression_8(t):
+    'postfix_expression : postfix_expression MINUSMINUS'
+    pass
+
+# primary-expression:
+
+
+def p_primary_expression(t):
+    '''primary_expression :  ID
+                        |  constant
+                        |  SCONST
+                        |  LPAREN expression RPAREN'''
+    pass
+
+# argument-expression-list:
+
+
+def p_argument_expression_list(t):
+    '''argument_expression_list :  assignment_expression
+                              |  argument_expression_list COMMA assignment_expression'''
+    pass
+
+# constant:
+
+
+def p_constant(t):
+    '''constant : ICONST
+               | FCONST
+               | CCONST'''
+    pass
+
+
+def p_empty(t):
+    'empty : '
+    pass
+
+
+def p_error(t):
+    print("Whoa. We're hosed")
+
+import profile
+# Build the grammar
+
+yacc.yacc()
+#yacc.yacc(method='LALR',write_tables=False,debug=False)
+
+#profile.run("yacc.yacc(method='LALR')")