write LEX file

Project-02/parser.out

@@ -1,5 +1,24 @@
 Created by PLY version 3.11 (http://www.dabeaz.com/ply)
 
+Unused terminals:
+
+    AOP
+    ASSIGN
+    COMMA
+    ELSE
+    FALSE
+    ID
+    IF
+    IN
+    LET
+    LOP
+    LPAREN
+    RELOP
+    RPAREN
+    SEMICOLON
+    THEN
+    TRUE
+
 Grammar
 
 Rule 0     S' -> expression
@@ -8,10 +27,26 @@ Rule 2     expression -> WHILE expression DO LBRACE expression RBRACE
 
 Terminals, with rules where they appear
 
+AOP                  : 
+ASSIGN               : 
+COMMA                : 
 CONST                : 1
 DO                   : 2
+ELSE                 : 
+FALSE                : 
+ID                   : 
+IF                   : 
+IN                   : 
 LBRACE               : 2
+LET                  : 
+LOP                  : 
+LPAREN               : 
 RBRACE               : 2
+RELOP                : 
+RPAREN               : 
+SEMICOLON            : 
+THEN                 : 
+TRUE                 : 
 WHILE                : 2
 error                : 
 

Project-02/parsetab.py

@@ -6,7 +6,7 @@ _tabversion = '3.10'
 
 _lr_method = 'LALR'
 
-_lr_signature = 'CONST DO LBRACE RBRACE WHILEexpression : CONSTexpression : WHILE expression DO LBRACE expression RBRACE'
+_lr_signature = 'AOP ASSIGN COMMA CONST DO ELSE FALSE ID IF IN LBRACE LET LOP LPAREN RBRACE RELOP RPAREN SEMICOLON THEN TRUE WHILEexpression : CONSTexpression : WHILE expression DO LBRACE expression RBRACE'
     
 _lr_action_items = {'CONST':([0,3,6,],[2,2,2,]),'WHILE':([0,3,6,],[3,3,3,]),'$end':([1,2,8,],[0,-1,-2,]),'DO':([2,4,8,],[-1,5,-2,]),'RBRACE':([2,7,8,],[-1,8,-2,]),'LBRACE':([5,],[6,]),}
 

Project-02/triplalex.py

@@ -1,43 +1,79 @@
 # ------------------------------------------------------------
-# triplalex.py
-#
-# tokenizer for the TRIPLA parser
+# Tokenizer for the TRIPLA parser
 # ------------------------------------------------------------
+
 import ply.lex as lex
 
-
 reserved = {
-    'while' : 'WHILE',
-    'do' : 'DO',
+    'let': 'LET',
+    'in': 'IN',
+    'if': 'IF',
+    'then': 'THEN',
+    'else': 'ELSE',
+    'while': 'WHILE',
+    'do': 'DO',
+    'true': 'TRUE',
+    'false': 'FALSE'
 }
 
 # List of token names. This is always required
 tokens = [
+    'ID',
     'CONST',
-    'LBRACE', 'RBRACE'
-]+list(reserved.values())
+    'AOP',
+    'RELOP',
+    'LOP',
+    'ASSIGN',
+    'LPAREN', 'RPAREN',
+    'LBRACE', 'RBRACE',
+    'COMMA',
+    'SEMICOLON',
+] + list(reserved.values())
 
-# Regular expression rules for simple tokens
-t_LBRACE  = r'\{'
-t_RBRACE  = r'\}'
-t_WHILE = r'while'
-t_DO = r'do'
+# Simple tokens
+t_LPAREN   = r'\('
+t_RPAREN   = r'\)'
+t_LBRACE   = r'\{'
+t_RBRACE   = r'\}'
+t_COMMA    = r','
+t_SEMICOLON = r';'
+t_ASSIGN = r'='
 
-# A regular expression rule with some action code
+# Arithmetic operators
+t_AOP = r'\+|\-|\*|/'
+
+# Comparison operators
+t_RELOP = r'<=|>=|==|!=|<|>'
+
+# Logical operators
+t_LOP = r'\|\||&&|==|!='
+
+# IDs
+def t_ID(t):
+    r'[A-Za-z_][A-Za-z0-9_]*'
+    t.type = reserved.get(t.value, 'ID')
+    return t
+
+# Constants
 def t_CONST(t):
-    r'\d+'
+    r'0|[1-9][0-9]*'
     t.value = int(t.value)
     return t
 
-# Define a rule so we can track line numbers
+# Linebreaks
 def t_newline(t):
     r'\n+'
     t.lexer.lineno += len(t.value)
 
-# A string containing ignored characters (spaces and tabs)
+# Ignore whitespace
 t_ignore  = ' \t'
 
-# Error handling rule
+# Comments
+def t_comment(t):
+    r'//.*'
+    pass
+
+# Error handling
 def t_error(t):
     print("Illegal character '%s'" % t.value[0])
     t.lexer.skip(1)