Add example

examples/jack-analyzer/.gitignore

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+lexer.*
+parser.*
+__pycache__

examples/jack-analyzer/JackAnalyzer.py

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+#!/usr/bin/env python3
+
+from lexer import Lexer, TokenType
+from parser import Parser
+from sys import argv
+from parserTypes import escape
+import glob
+import os
+
+def replaceSym(s):
+    return s.replace('&', '&')\
+        .replace('"', '"')\
+        .replace('<', '&lt;')\
+        .replace('>', '&gt;')
+
+debug=False
+fn = argv[1]
+
+def analyzeFile(fn):
+    tokenClass = {
+        'class': 'keyword',
+        'primType': 'keyword',
+        'propType': 'keyword',
+        'methodCategory': 'keyword',
+        'if': 'keyword',
+        'do': 'keyword',
+        'while': 'keyword',
+        'let': 'keyword',
+        'return': 'keyword',
+        'else': 'keyword',
+        'void': 'keyword',
+        'var': 'keyword',
+        'primVal': 'keyword',
+
+        'identifier': 'identifier',
+        'integerConstant': 'integerConstant',
+        'stringConstant': 'stringConstant',
+
+        'lb': 'symbol',
+        'rb': 'symbol',
+        'binOp': 'symbol',
+        'equals': 'symbol',
+        'minus': 'symbol',
+        'not': 'symbol',
+        'lp': 'symbol',
+        'rp': 'symbol',
+        'c': 'symbol',
+        'dot': 'symbol',
+        'sc': 'symbol',
+        'lbr': 'symbol',
+        'rbr': 'symbol',
+    }
+
+
+    print(f"<!-- Analyzing {fn} #-->")
+    # Lexer part
+    with open(fn) as f:
+        lex = Lexer(f.read(), debug)
+        tok, s = lex.getNextToken()
+        print('<tokens>')
+        while tok is not TokenType.eof:
+            t = tokenClass[tok.name[4:]]
+            if t == 'symbol':
+                s = escape(s)
+            print(f'<{t}> {s} </{t}>')
+            tok, s = lex.getNextToken()
+        print('</tokens>')
+
+    # Parser part
+    with open(fn) as f:
+        lex = Lexer(f.read(), debug)
+        parser = Parser(lex, debug)
+        expr = parser.parse()
+        res = "\n".join(filter(lambda x: len(x)>0, str(expr).split("\n")))
+        print(res)
+
+if os.path.isdir(fn):
+    for fn in glob.glob(os.path.join(fn,'*.jack')):
+        analyzeFile(fn)
+else:
+    analyzeFile(fn)

examples/jack-analyzer/README.md

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+# Jack Analyzer
+
+This is a quick and dirty implementation of <https://www.nand2tetris.org/project10> using ALPACA.
+
+The grammar is SLR, the default LALR parser obviously works, too.
+
+The implementation language is Python.
+
+Invoke ALPACA with `alpaca -lpy syntax.xy`