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In the last PyParsing subsection we created a parser for rst-order logic In this subsection we will create a PLY version that is designed to produce identical output to the PyParsing version Setting up the lexer is very similar to what we did earlier The only novel aspect is that we keep a dictionary of keywords which we check whenever we have matched a SYMBOL (the equivalent to an identi er in a programming language) Here is the lexer code, complete except for the t_ignore regex and the t_newline() and t_error() functions which are not shown because they are the same as ones we have seen before

because not all short values are char values, and neither are all char values short values A value of the null type (the null reference is the only such value) may be assigned to any reference type, resulting in a null reference of that type

A few utility methods help derived classes keep track of changes and of whether or not the in-memory state is consistent with the state of persistent storage:

keywords = {"exists": "EXISTS", "forall": "FORALL", "true": "TRUE", "false": "FALSE"} tokens = (["SYMBOL", "COLON", "COMMA", "LPAREN", "RPAREN", "EQUALS", "NOT", "AND", "OR", "IMPLIES"] + list(keywordsvalues())) def t_SYMBOL(t): r"[a-zA-Z]\w*" ttype = keywordsget(tvalue, "SYMBOL") return t t_EQUALS = r"=" t_NOT = r"~" t_AND = r"&" t_OR = r"\|" t_IMPLIES = r"->" t_COLON = r":" t_COMMA = r"," t_LPAREN = r"\(" t_RPAREN = r"\)"

Point3D p3d = p;

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The t_SYMBOL() function is used to match both symbols (identi ers) and keywords If the key given to dictget() isn t in the dictionary the default value (in this case "SYMBOL") is returned; otherwise the key s corresponding token name is returned Notice also that unlike in previous lexers, we don t change the plylexLexToken s value attribute, but we do change its type attribute to be either "SYMBOL" or the appropriate keyword token name All the other tokens are matched by simple regexes all of which happen to match one or two literal characters In all the previous PLY examples the lexer alone has been suf cient for our parsing needs But for the rst-order logic BNF we need to use PLY s parser as well as its lexer to do the parsing Setting up a PLY parser is quite straightforward and unlike PyParsing we don t have to reformulate our BNF to match certain patterns but can use the BNF directly For each BNF de nition, we create a function with a name pre xed by p_ and whose docstring contains the BNF statement the function is designed to process As the parser parses, it calls the function with the matching BNF statement and passes it a single argument of type plyyaccYaccProduction The argument is given the name p (following the PLY examples naming conventions) When a BNF statement includes alternatives, it is possible to create just one function to handle them all, although in most cases it is clearer to create one function per alternative or set of structurally similar alternatives We will look at each of the parser functions, starting with the one for handling quanti ers

(even though it is, dynamically, in this example) // Assignments to variables of type Object: Object o = p; // ok: any object to Object

/** * Report if the preferences have been initialized (eg, from * persistent storage) * * @return true if the preferences have been * initialized */ protected boolean isInitialized() { return _isInitialized; }

def p_formula_quantifier(p): """FORMULA : FORALL SYMBOL COLON FORMULA | EXISTS SYMBOL COLON FORMULA""" p[0] = [p[1], p[2], p[4]]

int[] a = new int[3]; Object o2 = a; // ok: an array to Object // Assignments to variables of interface type: ColoredPoint cp = new ColoredPoint(); Colorable c = cp; // ok: ColoredPoint implements // Colorable

* have been initialized (eg, from persistent storage) * * @param initialized true if the preferences * have been initialized */ protected void setInitialized( boolean initialized ) { _isInitialized = initialized; } /** * Get the hash table containing attributes that have changed * * @return the hash table of changed attributes */ protected Hashtable getChanges() { return _changed; }

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