TweetFollow Us on Twitter

Parsing with YACC
Volume Number:6
Issue Number:4
Column Tag:Language Translation

Introduction to Parsing and Inside YACC

By Clifford Story, Mount Prospect, IL

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Part I. Intoduction to Parsing

A. Introduction

This is the first of a series of articles on language translation. This is commonly called “parsing”, and I will no doubt lapse from time to time into this usage, but it is better to reserve the word for one phase of translation.

The techniques I will discuss are used in compilers and interpreters, of course, but also in many more-common circumstances. For example, when you add a formula to a speadsheet, the application must translate the formula into a form it can use. Many database programs let you specify formats for input fields -- these must translate your format, and then use the result to translate the input. Consider the expression search in MPW. I guarantee you there’s a translator operating there. And, of course, my own program Idealiner uses a translator when you specify topic numbers.

All the code examples in this series of articles will be MPW tools, to minimize interface considerations. I doubt if you’ll see a single Macintosh trap before the tenth article. I will focus instead on the internals of language translation.

Language translation can be divided into three stages: first, the LEXICAL ANALYZER (also called the “scanner”) divides the input text into individual symbols, pieces like identifiers, operators and constants; then the PARSER interprets the sequence of symbols according to the language’s grammar; and lastly the CODE GENERATOR responds in an appropriate fashion to the statements the parser has processed. These three phases operate simultaneously, the parser calling the lexical analyzer for input, and then calling the code generator for output.

A(1). Parsing

The first three parts in the series will focus on parsing.

The first part of the article (this very one) will introduce parsing and the parser-generator YACC (Yet Another Compiler Compiler). YACC converts a set of GRAMMAR RULES into C source for a parser that will accept that grammar. You still have to write the lexical analyzer and the code generator (although YACC provides a framework for code generation) but YACC takes care of the most tedious part of the job.

The second part will go beneath the surface and explore the inner workings of YACC. This will be somewhat technical, and may seem unnecessary, but it will provide an essential foundation for later topics. The article will cover deriving parse tables from YACC output, parsing expressions by hand (using the parse tables), and YACC’s debug output.

The next article will discuss ambiguities, association and error detection. An understanding of the first two topics are essential to writing correct and efficient grammars. The third covers detecting and reporting errors by type and location.

A(2). Lexical Analysis

With the third article, I will return to the first stage of language translation, lexical analysis. The article will begin with a discussion of state machines, then present a simple but effective table-driven analyzer.

The fourth article will be an excursion into a seemingly unrelated field: hash tables and binary trees. The idea is to develop some tools to increase the power of the lexical analyzer in the following article.

The fifth article will extend the analyzer by adding a symbol table. The routines developed in the fifth article will give us a way to save symbols; the example program will be an improved version of the MPW Canon tool.

A(3). And a Useful Example

Now, I’m pretty sure of the preceding, because I’ve already written the articles! What follows is a forecast of what I’ll do next.

The plan is to build an MPW tool that will preprocess either Pascal or C source files and convert inline assembly code into Pascal inline routines or C direct functions, as appropriate. That is, you will be able to write assembly language instructions, and the preprocessor will convert your assembly into machine language. Your assembler routines will be declared with high-level headers, a la Lightspeed C, and you will be able to refer to routine arguments and local variables by name, rather than indexing off the stack, a real convenience. I’m going to write this tool because, damn it, I want to use it!

This will be a major project: I’ll need to parse Pascal and C well enough to find routines, and I’ll need to parse assembler completely. I’ll then need to write a more-or-less complete assembler. It could take six or eight columns.

B. Grammar Descriptions

Here’s a reference for this topic: Compilers: Principles, Techniques and Tools, by Aho, Sethi and Ullman (Addison-Wesley 1986). You may have heard of some of these guys. I will refer to it as “ASU”.

A computer language is composed of a set of symbols (the “words” of the language), and a set of grammar rules that determine how these words are formed into statements (the “sentences” of a computer language). As I said earlier, the lexical analyzer is in charge of extracting the “words” from the input; it is the job of the parser to make meaningful “sentences” from these “words”.

A bit of terminology: classes of symbols (such as “integer” or “identifier”) are called TOKENS, and specific instances of tokens (such as “252” or “sysbeep”) are called LEXEMES. The lexical analyzer will typically determine both the type and value of a symbol that it reads; the former is the token classification and the latter is the lexical value. The parser cares about tokens; the code generator cares about values.

I guarantee that I will use the word “token” to mean both token and lexeme. The meaning should be clear from the context.

B(1). Grammar Rules

A grammar rule is called a PRODUCTION. It is a substitution rule; the single symbol of the left-hand side (often, but not by me, abbreviated LHS) produces the expansion on the right-hand side (RHS). Here’s an example:

 stmt -> ID ‘=’ expr ‘;’

A ‘stmt’ can be expanded to (that’s what the ‘->’ means) a series of symbols consisting of an ‘ID’, an ‘=’ sign, and ‘expr’ and a semicolon. Symbols within quotation marks are explicit, and must appear as written; other symbols are token classes.

Recursive definition is permitted. Here’s an example:

 expr -> expr ‘+’ NUM

Applying this rule to the first, we discover that:

 stmt -> ID ‘=’ expr ‘+’ NUM ‘;’
 stmt -> ID ‘=’ expr ‘+’ NUM ‘+’ NUM ‘;’

And so on. It is possible to determine a complete language such as Pascal or C with relatively few such productions, even though there are infinitely-many legal statements in the language.

Now, everyone can make up his own conventions, of course, but I will distinguish two kinds of non-explicit symbols by showing one in all-caps and one in all-lower-case. All-caps symbols are defined by the lexical analyzer, not by the parser. Thus, they will not appear on the left-hand side of any production. These symbols are call TERMINALS, because they terminate expansion. When you expand to a terminal, you can expand no further. The lower-case symbols are, surprise!, NON-TERMINALS. They are defined by the parser rather than the lexical analyzer, appear somewhere as the left-hand side of one or more productions, and do not terminate expansion. These distinctions are important!

As the above examples suggest, several productions can share the same left-hand side:

 expr -> expr ‘+’ NUM
 expr -> NUM

This pair of productions expands to arbitrary sums. Just start with the first production and substitute the first production into it to add another term, or the second to terminate the expansion.

B(2). An Example Grammar

This will be fun. If you don’t want to mess with abstract symbols, just skip this whole section; the result is all you need. My development of the grammar won’t be very theoretical, though.

A parser reads the input symbols from left to right, until it has read the right-hand side of a production. Then it REDUCES the input, running the production backwards and replacing the right-hand side with the left-hand side. This is the point at which code is generated, and expressions evaluated: when a reduction occurs.

So to see if a grammar does what we want, we can start with a test statement that should be accepted by the grammar, and see what happens when we play parser.

The grammar we are shooting for will accept simple algebraic expressions, involving addition, subtraction, multiplication and division of numbers.

B(2)(a). First Try

Earlier, we saw productions that can expand to arbitrary sums:

 expr -> expr ‘+’ NUM
 expr -> NUM

We can add a few more to get the other three usual operators:

/* 1 */

 (1)  expr -> expr ‘+’ NUM
 (2)  expr -> expr ‘-’ NUM
 (3)  expr -> expr ‘*’ NUM
 (4)  expr -> expr ‘/’ NUM
 (5)  expr -> NUM

Let’s try a simple test:

 NUM ‘+’ NUM ‘*’ NUM
 -> expr ‘+’ NUM ‘*’ NUM

(rule 5; remember that we read from the left)

 -> expr ‘*’ NUM (rule 1)
 -> expr (rule 3)

The addition was the first thing to go; therefore, it was performed first. This is contrary to our expectations, I hope (my past as a math teacher shows itself!). The grammar won’t work. We need to make sure that multiplication and division are performed before addition and subtraction.

B(2)(b). Second Try

So let’s introduce another non-terminal. We want to cluster products together, to ensure that they are evaluated first, so let’s make them a separate non-terminal:

/* 2 */

 (1)  expr -> expr ‘+’ term
 (2)  expr -> expr ‘-’ term
 (3)  expr -> term
 (4)  term -> term ‘*’ NUM
 (5)  term -> term ‘/’ NUM
 (6)  term -> NUM

Now try the test string again:

 NUM ‘+’ NUM ‘*’ NUM
 -> term ‘+’ NUM ‘*’ NUM
    (rule 6)
 -> expr ‘+’ NUM ‘*’ NUM
    (rule 3)
 -> expr ‘+’ term ‘*’ NUM
    (rule 6)

Oops, it looks like we have a choice here: rule 1 or rule 4. We really don’t, though; reducing by rule 1 would leave us with “expr ‘*’ NUM”, and we don’t have any rule with “expr ‘*’” in it.

 -> expr ‘+’ term
   (rule 4)
 -> expr
 (rule 1)

So the multiplication happened first, just like we wanted.

B(2)(c). Third Try

Suppose, however, that we wanted the addition to occur first. Then we need to add some parentheses:

/* 3 */

 (1)  expr -> expr ‘+’ term
 (2)  expr -> expr ‘-’ term
 (3)  expr -> term
 (4)  term -> term ‘*’ NUM
 (5)  term -> term ‘/’ NUM
 (6)  term -> ‘(‘ expr ‘)’
 (7)  term -> NUM

Now we treat an addition or subtraction that occurs within parentheses as if the sum or difference was a ‘term’ (rule 6). And that should do it.

C. YACC: Yet Another Compiler Compiler

YACC is a UNIX tool that builds parsers from grammars. We can take the grammar just developed, supplement it with a minimal bit of C code, and YACC will write the complete parser for us. Or, if the parser is only a small part of a big program, YACC will write that small part, and we can then link it to the main program. In either case, YACC saves us from the unbearable tedium of computing parse tables by hand.

A YACC input file is divided into three parts: the declaration part, the grammar part, and the program part. (Remind you of anything? My past as a COBOL programmer coming out!) The three sections are separated by lines beginning:

 %%

YACC writes a C source file as its output; it will also write a file of parser information if you desire it. We’ll look at that next time.

C(1). The Declaration Section

The declarations include a set of C-style declarations that are used by YACC to build the parser. For now, there are only two sorts of declarations that concern us.

The first is the “%token” declaration. YACC will automatically recognize one-character tokens like ‘+’ and ‘-’. All other terminal tokens must be declared with the %token statement, e.g.,

 %token NUM

Non-terminals do not need to be declared; they are implicitly declared in the grammar rules.

The second declaration type lets us pass regular C declarations through YACC to the C compiler. These look like this:

/* 4 */

 %{
 #define blip 12
 %}

Anything between the %{ and the %} is passed through unchanged, and written by YACC to the C source file.

It is customary to include a #define for YYSTYPE. What is YYSTYPE? It is the type of the parser’s stack. For now, there’s no need to worry about it. It is “int” by default, and int will work fine for what we’re doing this month. Later, after I’ve discussed how the parser operates, and we know what sort of things go on the stack, we’ll come back to it.

C(2). The Grammar Section

The grammar section includes all the grammar productions, like those we discussed earlier. They are written in a somewhat non-standard format (taking ASU’s notation as the standard, which I think is reasonable). They also provide a framework for code generation.

C(2)(a). Production Rule Format

The arrow in productions is replaced with a colon, and productions with the same left-hand side are combined into one, with the right-hand sides separated with vertical bars, |. The last right-hand side is terminated with a semicolon. The usual practice is to format the productions like this:

/* 5 */

 expr : expr ‘+’ term
 | expr ‘-’ term
 | term
 ;

 term : term ‘*’ NUM
 | term ‘/’ NUM
 | ‘(‘ expr ‘)’
 | NUM
 ;

in place of:

 expr -> expr ‘+’ term
 expr -> expr ‘-’ term
 expr -> term
 term -> term ‘*’ NUM
 term -> term ‘/’ NUM
 term -> ‘(‘ expr ‘)’
 term -> NUM

C(2)(b). Code Generation

You can follow each right-hand side with some pseudo-C code that the parser will then call when the production rule is executed (i.e., if you read that stuff about reductions, when the input is reduced by that production).

Here’s an example. Suppose you have the production rules:

 expr : expr ‘+’ term
 | expr ‘-’ term
 | term
 ;

The question is, what is the value of the “expr”? In the first case, it’s the value of the first token of the right-hand side plus the value of the third; in the second, it’s the first minus the third; and in the third, it’s just the value of the first token. So we write:

/* 6 */

 expr : expr ‘+’ term
 {
 $$ = $1 + $3;
 }

 | expr ‘-’ term
 {
 $$ = $1 - $3;
 }

 | term
 {
 $$ = $1;
 }

 ;

This isn’t hard to figure out; $$ is the value of the left-hand side, $1 is the value of the first token of the right-hand side, $3 the value of the third token. Using those symbols, you just write straight C code. You are not limited to a single line, and you can call routines that you have written elsewhere. Don’t forget the braces or the semicolons.

C(3). The Program Section

The program section is made up of straight C code, and is copied unaltered into the C source file. While YACC requires that you supply some routines to it, you can put them in another file, and this section can be completely empty. In simpler cases, however, the program section allows you to write your entire program in the YACC source file.

Here’s what YACC requires: a lexical analyzer, called yylex(), and an error routine, yyerror(). Common sense requires a main() routine as well.

The prototype for yylex() is:

/* 7 */

 int yylex();

The parser routine, called yyparse(), will call yylex() whenever it needs input. yylex() reads the next token, sets the global variable “yylval” to the value of the token (optional; this is the “$” value used in the production code), and returns the token type. You might wonder where it reads the token from, since it hasn’t any arguments. The answer is, it uses global variables of some sort, such as a global string or a global file reference, that is set up by the main() routine.

The error routine is:

/* 8 */

 void yyerror(char *message);

The message is generated by the parser when it detects an error; yyerror()’s job is to notify the user that something has gone wrong. Of course, you don’t have do live with YACC’s default error messages, which are rather unilluminating; you can call yyerror() yourself. More on this in a future article.

D. An MPW Hex Calculator

Now for some real code. Our example program is an MPW tool, a hex calculator. It will evaluate expressions using +, -, * and /, and will also properly evaluate expressions with parentheses in them. The name of the tool is “Hex”; you can invoke it with an expression, e.g.:

 Hex ‘2 - ( 3 - 4 )’

in which case it will evaluate, print the result, and exit. Notice that in this case, the expression must be in quotation marks, or MPW will treat each token separately. Note also that the tokens must be separated by spaces. This is to simplify the lexical analyzer; we will relax this requirement in a future version.

The tool may also be invoked without an expression to evaluate. It will then go into a loop, reading in expressions and evaluating them, e.g.:

 Hex
 ? 2 - ( 3 - 4 )
 = 3
 ? 64 * 8
 = 320
 ?

The loop ends on a blank line.

Here are the input globals and the code for the main() routine:

/* 9 */

char    *input;
char    *token;

void main(int argc, char *argv[])
 {
 
 char   thestring[256];
 
 if (argc < 1)
 printf(“\tImpossible error!\n”);
 else if (argc > 2)
 printf(“\tHey!  One at a time!\n”);
 else if (argc == 2)
 {
 input = argv[1];
 yyparse();
 }
 else
 {
 printf(“? “);
 while (strlen(gets(thestring)) > 2)
 {
 input = &thestring[2];
 yyparse();
 printf(“? “);
 }
 }
 
 }

“input” is the input buffer, and holds the expression to evaluate. “token” is filled by yylex() with the current token. It’s useful for debugging and error reporting. Finally, in the read loop, notice that the gets() routine will read the “? ” prompt as well as the expression, this being MPW, which is why “input” points to thestring[2].

D(1). The Lexical Analyzer and Error Routines

This is about as simple as a lexical analyzer can be. The strtok() routine will return the tokens in the input string, so long as they’re separated by spaces, or newline at the end of input. Then if sscanf() can read a hex number, that’s what the token must be; if it isn’t a number, it must be an operator or a parenthesis, so return the first character.

This routine is so simple it is vulnerable to pathological input -- please don’t TRY to break it! Where’s the challenge? This is just a stopgap, good enough to serve until we get a real lexical analyzer.

/* 10 */

int yylex()
 {
 
 if (input == 0)
 token = strtok(0, “ “);
 else
 {
 token = strtok(input, “ “);
 input = 0;
 }
 
 if (token == 0)
 return(‘\n’);
 else if (sscanf(token, “%x”, &yylval) == 1)
 return(NUM);
 else
 return(token[0]);
 }

The error routine is even simpler. It just prints out the parser’s default error message, which is the blindingly helpful “syntax error”. We do add the current token, which may be helpful.

/* 11 */

#define yyerror(x)
 {
 printf(“\t%s [%s]\n”, x, token);
 return(0);
 }

(This is divided into separate lines to fit in Mac Toot’s narrow columns; that’s not the way we’d write it in C, of course!) Note the return statement. yyerror is called from within the parser routine yyparse(), so that’s what we’re returning from. The effect is to abort the translation.

D(2). The Grammar

The grammar we will use is the same as that developed earlier. There’s one additional production: we have to give YACC a START SYMBOL, which is the left-hand side of the first production. In this case, “prob” is short for “problem”.

 prob -> expr ‘\n’

The newline is a single-character token returned by yylex() to signal the end of input. So if the entire input string is an expression, we’ve got a complete problem. Any other occurrence of a newline is an error.

/* 12 */

 prob -> expr ‘\n’
 expr -> expr + term
 expr -> expr - term
 expr -> term
 term -> term * NUM
 term -> term / NUM
 term -> ( expr )
 term -> NUM

D(3). The Value Calculation and Output

Here’s the actual YACC input file, declaration and grammar sections. The declaration section consists of a single %token declaration, making NUM a terminal symbol. The grammar section includes all the productions listed above, each with some associated code.

/* 13 */

%token  NUM

%%

prob  : expr
 {
 printf(“\t= %X\n”, $1);
 return(0);
 }
 
 ;
 
expr  : expr ‘+’ term
 {
 $$ = $1 + $3;
 }
 
 | expr ‘-’ term
 {
 $$ = $1 - $3;
 }
 
 | term
 {
 $$ = $1;
 }
 
 ;

term  : term ‘*’ NUM
 {
 $$ = $1 * $3;
 }
 
 | term ‘/’ NUM
 {
 $$ = $1 / $3;
 }
 
 | ‘(‘ expr ‘)’
 {
 $$ = $2;
 }
 
 | NUM
 {
 $$ = $1;
 }
 
 ;

D(4). The Make File

YACC goes right into your make file, just like any other MPW tool. Hmm. I thought I said that YACC was a UNIX tool... The truth is that there is an MPW version of YACC available, called MACYACC (I have renamed the tool on my system to make typing easier).

#14

 Hex.c ƒ Hex.make Hex.y
 Yacc -VHex.out Hex.y
 Hex.c.o ƒ Hex.make Hex.c
 C -r Hex.c
 Hex ƒƒ Hex.make Hex.c.o
 Link -w -t MPST -c ‘MPS ‘ 
 Hex.c.o 
 “{Libraries}”Interface.o 
 “{CLibraries}”CRuntime.o 
 “{CLibraries}”StdCLib.o 
 “{CLibraries}”CSANELib.o 
 “{CLibraries}”Math.o 
 “{CLibraries}”CInterface.o 
 “{Libraries}”ToolLibs.o 
 -o Hex

E. Review of Abraxas’ MACYACC

MACYACC is a port of Abraxas’ PCYACC to the Macintosh. It functions as an MPW tool; you can call it from a make file just like a compiler. Abraxas sells it in two versions: The Personal Version for $139.00 includes the YACC tool itself and a small set of examples; the Professional Version for $395.00 includes that, plus MACLEX (a lexical analyzer generator) and two floppies of big examples, including grammars for C++, Hypertalk, SQL, Pascal, K & R C, ANSI C, and so on.

I won’t hide the ball; my recommendation is that you buy the Personal Version and skip the Professional Version.

E(1). Buy the Personal Version

Here’s why you should buy the Personal Version: because it works. You can just stick it in your make file and forget it.

The guys at Abraxas are apparently not too attuned to the Mac and MPW, so the port from the PC is pretty brutal. There are a lot of irritating little things, non-standard behavior and so forth. For example, to get a list of the command-line options, you don’t type “help yacc”; no, you invoke the tool itself without any options. The tool, when called with arguments, writes out a few lines of copyright information and the name of the grammar file it is processing, contrary to the MPW rule that a compiler should run silently. You can’t quiet it by directing standard output to Dev:Null, because it writes error messages to standard output. Abraxas converted the PCYACC manual by simply replacing all occurrences of “PCYACC” with “MACYACC”, which provides a lot of laughs. And so on.

The Fully-Worked-Out example requires Quick C to compile. Quick C requires Windows. The example is a graphics program; it requires a CGA monitor to run. Like I said, a lot of laughs...

Somehow, though, I find myself comforted by all that evidence of MACYACC’s lowly origin. Why? Because it means that those nice PC programmers have already debugged the thing for us! The internal code changes between the two versions were probably minimal and I doubt if the guts of the program were touched at all. So what has worked on the PC in the past should continue to work on the Mac. (Abraxas tells me that PCYACC has been out for five years, and MACYACC for two. Lotsa time for a shakedown.)

I did some comparisons. I converted the same grammar files with MACYACC and the Unix YACC from the Apollo at work. The parse tables were identical. In fact, I took an example from ASU and submitted it to both YACCs; all three parse tables were identical, except that ASU’s had error conditions in some places where the two YACC tables had reductions, which means that the YACC tables would take longer to catch some errors (more on this in a later article).

So I conclude: if you plan to write parsers, MACYACC is a whole lot easier than deriving parse tables by hand. (This is the voice of experience talking! I derived the parse table for my Idealiner parser by hand.)

E(2). Complaints with MACYACC

Now here are some complaints:

(1) The -t and -T command line options are very badly explained; I had to get Abraxas to tell me just what they are supposed to do. They cause the YACC-generated parser to write a special dump file. Unfortunately, this file is created untyped; you have to set its type to TEXT before you can even read it. And then it’s not too useful (see next month’s installment).

(2) MPW 2.0.2 is included on the disk. Or is it? Only the MPW Shell is there! This is totally weird. No tools, no startup script, nothing but the shell. C‘mon, guys, all or nothing! I don’t know what you can accomplish with just the shell. (Of course, people likely to be interested in Yacc are also likely to have MPW already.)

(3) The manual isn’t the worst I’ve ever seen but you’ll do a lot better if you don’t rely on it as a tutorial. If you can get a hold of the YACC chapter from a UNIX system manual, use that instead. It’s a lot clearer. With luck, this series of articles will repair some of the deficiencies of the manual.

One problem with YACC is that it came out of UNIX, and so is filled with obscure identifiers. What, for example, are “yyval” and “yylval”? I was not able to find the answer in the MACYACC manual. (“yylval” is a global used to return the value of the token read by the function yylex() -- you gotta know that! “yylval”, I’m pretty sure, is the value of the left-hand side of the last reduction.)

When TML came out with their MPW Pascal, they included four floppies (with the complete MPW system) and an inch of documents in a custom cardboard box, and priced the thing at $125.00. That means that they probably got about $70.00 from dealers. Abraxas, as far as I know, sells only directly to customers. For twice the price, they should be able to come up with a comparable package; most importantly, they should write a useful manual, and get a Mac programmer to do a real port.

On the other hand, they haven’t many Mac customers, and so they haven’t felt inclined to spend much effort on the Mac product. Or is it the other way around?

E(3). Skip the Professional Version

For an extra $256.00, you can get the Professional Version: the Personal Version, plus two disks of example grammars and a third with MACLEX. Is it worth the money? No.

These three disks come with no written manual. Most examples have sketchy read-me files instead. Not sufficient. You are on your own if you want to use them.

Abraxas itself admits that Lex is useless; they recommend building lexical analyzers by hand, as you can do a better job that way. This is, apparently, the prevailing wisdom; I found the same advice in a UNIX book.

As for the example grammars: These are direct ports from the PC. Many of the source files do not even have Macintosh file types! A few examples present the grammar only; most include enough code to get a syntax checker going but, of course, omit code generation. So the grammars are what counts. But how much is a grammar description of an existing language really worth?

Consider: a few years ago, Apple put out a wall poster with the complete syntax of Pascal. (If anyone has one of those posters and is tired of it, I’d be delighted to take it off his hands...) You could take that poster and write a grammar description in about ten minutes. So why should you pay $256.00?

Well, Abraxas also includes grammars to languages that are not so well-documented. You won’t find Hypertalk on any poster, for example, and if you want to see its grammar, Abraxas presents it for you. Whether that is worth $256.00 is a judgment call; in my judgment, it is not.

I think that if Abraxas cleaned up the code (i.e., did a complete port) and wrote a manual, they could justify selling the Professional Version for, say, $195.00. Without a manual, and with code designed for the PC, $395.00 is way out of line.

Column Tag: Letters

Parse Table Correction

By Kirk Chase, Editor, MacTutor

Parse Table Correction

Kirk Chase

MacTutor

Unfortunately, Clifford Story’s second part in his Language Translation Series was missing the parse table. Here it is for you now:

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Dropbox 193.4.5594 - Cloud backup and sy...
Dropbox is a file hosting service that provides cloud storage, file synchronization, personal cloud, and client software. It is a modern workspace that allows you to get to all of your files, manage... Read more
Google Chrome 122.0.6261.57 - Modern and...
Google Chrome is a Web browser by Google, created to be a modern platform for Web pages and applications. It utilizes very fast loading of Web pages and has a V8 engine, which is a custom built... Read more
Skype 8.113.0.210 - Voice-over-internet...
Skype is a telecommunications app that provides HD video calls, instant messaging, calling to any phone number or landline, and Skype for Business for productive cooperation on the projects. This... Read more
Tor Browser 13.0.10 - Anonymize Web brow...
Using Tor Browser you can protect yourself against tracking, surveillance, and censorship. Tor was originally designed, implemented, and deployed as a third-generation onion-routing project of the U.... Read more
Deeper 3.0.4 - Enable hidden features in...
Deeper is a personalization utility for macOS which allows you to enable and disable the hidden functions of the Finder, Dock, QuickTime, Safari, iTunes, login window, Spotlight, and many of Apple's... Read more
OnyX 4.5.5 - Maintenance and optimizatio...
OnyX is a multifunction utility that you can use to verify the startup disk and the structure of its system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the... Read more
Hopper Disassembler 5.14.1 - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more

Latest Forum Discussions

See All

Zenless Zone Zero opens entries for its...
miHoYo, aka HoYoverse, has become such a big name in mobile gaming that it's hard to believe that arguably their flagship title, Genshin Impact, is only three and a half years old. Now, they continue the road to the next title in their world, with... | Read more »
Live, Playdate, Live! – The TouchArcade...
In this week’s episode of The TouchArcade Show we kick things off by talking about all the games I splurged on during the recent Playdate Catalog one-year anniversary sale, including the new Lucas Pope jam Mars After Midnight. We haven’t played any... | Read more »
TouchArcade Game of the Week: ‘Vroomies’
So here’s a thing: Vroomies from developer Alex Taber aka Unordered Games is the Game of the Week! Except… Vroomies came out an entire month ago. It wasn’t on my radar until this week, which is why I included it in our weekly new games round-up, but... | Read more »
SwitchArcade Round-Up: ‘MLB The Show 24’...
Hello gentle readers, and welcome to the SwitchArcade Round-Up for March 15th, 2024. We’re closing out the week with a bunch of new games, with Sony’s baseball franchise MLB The Show up to bat yet again. There are several other interesting games to... | Read more »
Steam Deck Weekly: WWE 2K24 and Summerho...
Welcome to this week’s edition of the Steam Deck Weekly. The busy season has begun with games we’ve been looking forward to playing including Dragon’s Dogma 2, Horizon Forbidden West Complete Edition, and also console exclusives like Rise of the... | Read more »
Steam Spring Sale 2024 – The 10 Best Ste...
The Steam Spring Sale 2024 began last night, and while it isn’t as big of a deal as say the Steam Winter Sale, you may as well take advantage of it to save money on some games you were planning to buy. I obviously recommend checking out your own... | Read more »
New ‘SaGa Emerald Beyond’ Gameplay Showc...
Last month, Square Enix posted a Let’s Play video featuring SaGa Localization Director Neil Broadley who showcased the worlds, companions, and more from the upcoming and highly-anticipated RPG SaGa Emerald Beyond. | Read more »
Choose Your Side in the Latest ‘Marvel S...
Last month, Marvel Snap (Free) held its very first “imbalance" event in honor of Valentine’s Day. For a limited time, certain well-known couples were given special boosts when conditions were right. It must have gone over well, because we’ve got a... | Read more »
Warframe welcomes the arrival of a new s...
As a Warframe player one of the best things about it launching on iOS, despite it being arguably the best way to play the game if you have a controller, is that I can now be paid to talk about it. To whit, we are gearing up to receive the first... | Read more »
Apple Arcade Weekly Round-Up: Updates an...
Following the new releases earlier in the month and April 2024’s games being revealed by Apple, this week has seen some notable game updates and events go live for Apple Arcade. What The Golf? has an April Fool’s Day celebration event going live “... | Read more »

Price Scanner via MacPrices.net

Apple Education is offering $100 discounts on...
If you’re a student, teacher, or staff member at any educational institution, you can use your .edu email address when ordering at Apple Education to take $100 off the price of a new M3 MacBook Air.... Read more
Apple Watch Ultra 2 with Blood Oxygen feature...
Best Buy is offering Apple Watch Ultra 2 models for $50 off MSRP on their online store this week. Sale prices available for online orders only, in-store prices may vary. Order online, and choose... Read more
New promo at Sams Club: Apple HomePods for $2...
Sams Club has Apple HomePods on sale for $259 through March 31, 2024. Their price is $40 off Apple’s MSRP, and both Space Gray and White colors are available. Sale price is for online orders only, in... Read more
Get Apple’s 2nd generation Apple Pencil for $...
Apple’s Pencil (2nd generation) works with the 12″ iPad Pro (3rd, 4th, 5th, and 6th generation), 11″ iPad Pro (1st, 2nd, 3rd, and 4th generation), iPad Air (4th and 5th generation), and iPad mini (... Read more
10th generation Apple iPads on sale for $100...
Best Buy has Apple’s 10th-generation WiFi iPads back on sale for $100 off MSRP on their online store, starting at only $349. With the discount, Best Buy’s prices are the lowest currently available... Read more
iPad Airs on sale again starting at $449 on B...
Best Buy has 10.9″ M1 WiFi iPad Airs on record-low sale prices again for $150 off Apple’s MSRP, starting at $449. Sale prices for online orders only, in-store price may vary. Order online, and choose... Read more
Best Buy is blowing out clearance 13-inch M1...
Best Buy is blowing out clearance Apple 13″ M1 MacBook Airs this weekend for only $649.99, or $350 off Apple’s original MSRP. Sale prices for online orders only, in-store prices may vary. Order... Read more
Low price alert! You can now get a 13-inch M1...
Walmart has, for the first time, begun offering new Apple MacBooks for sale on their online store, albeit clearance previous-generation models. They now have the 13″ M1 MacBook Air (8GB RAM, 256GB... Read more
Best Apple MacBook deal this weekend: Get the...
Apple has 13″ M2 MacBook Airs available for only $849 today in their Certified Refurbished store. These are the cheapest M2-powered MacBooks for sale at Apple. Apple’s one-year warranty is included,... Read more
New 15-inch M3 MacBook Air (Midnight) on sale...
Amazon has the new 15″ M3 MacBook Air (8GB RAM/256GB SSD/Midnight) in stock and on sale today for $1249.99 including free shipping. Their price is $50 off MSRP, and it’s the lowest price currently... Read more

Jobs Board

Early Preschool Teacher - Glenda Drive/ *Appl...
Early Preschool Teacher - Glenda Drive/ Apple ValleyTeacher Share by Email Share on LinkedIn Share on Twitter Read more
Senior Software Engineer - *Apple* Fundamen...
…center of Microsoft's efforts to empower our users to do more. The Apple Fundamentals team focused on defining and improving the end-to-end developer experience in Read more
Relationship Banker *Apple* Valley Main - W...
…Alcohol Policy to learn more. **Company:** WELLS FARGO BANK **Req Number:** R-350696 **Updated:** Mon Mar 11 00:00:00 UTC 2024 **Location:** APPLE VALLEY,California Read more
Medical Assistant - Surgical Oncology- *Apple...
Medical Assistant - Surgical Oncology- Apple Hill WellSpan Medical Group, York, PA | Nursing | Nursing Support | FTE: 1 | Regular | Tracking Code: 200555 Apply Now Read more
Early Preschool Teacher - Glenda Drive/ *Appl...
Early Preschool Teacher - Glenda Drive/ Apple ValleyTeacher Share by Email Share on LinkedIn Share on Twitter Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.