Init next project

Project-02/triplalex.py

@@ -0,0 +1,46 @@
+# ------------------------------------------------------------
+# triplalex.py
+#
+# tokenizer for the TRIPLA parser
+# ------------------------------------------------------------
+import ply.lex as lex
+
+
+reserved = {
+    'while' : 'WHILE',
+    'do' : 'DO',
+}
+
+# List of token names. This is always required
+tokens = [
+    'CONST',
+    'LBRACE', 'RBRACE'
+]+list(reserved.values())
+
+# Regular expression rules for simple tokens
+t_LBRACE  = r'\{'
+t_RBRACE  = r'\}'
+t_WHILE = r'while'
+t_DO = r'do'
+
+# A regular expression rule with some action code
+def t_CONST(t):
+    r'\d+'
+    t.value = int(t.value)
+    return t
+
+# Define a rule so we can track line numbers
+def t_newline(t):
+    r'\n+'
+    t.lexer.lineno += len(t.value)
+
+# A string containing ignored characters (spaces and tabs)
+t_ignore  = ' \t'
+
+# Error handling rule
+def t_error(t):
+    print("Illegal character '%s'" % t.value[0])
+    t.lexer.skip(1)
+
+# Build the lexer
+lexer = lex.lex()