regsub ''http://" $argv "" argv regsub "/" $argv " " argv in Java

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regsub ''http://" $argv "" argv regsub "/" $argv " " argv
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;# remove http:// i f present ;# rep1ace leading / w i t h blank
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s e t so [socket [lindex $argv 01 801 ;# make network connection set q "/[lindex Sargv 11" puts $SO "GET $q HTTP/lO\n\n" ;# send request f l u s h Bso w h i l e {[gets Bso l i n e ] >= 0 && $ l i n e != "") I) ;# s k i p header puts [read Bsol ;# read and p r i n t e n t i r e r e p l y
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This script typically produces voluminous output, much of which is HTML tags bracketed by < and > Perl is good at text substitution, so our next tool is a Perl script that uses regular expressions and substitutions to discard the tags:
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# unhtml p l : delete HTML tags
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while (o) { $ s t r = $-;
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# c o l l e c t a l l input i n t o single s t r i n g # by concatenating i n p u t 1i nes
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# delete < > # replace   by blank # compress white space
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Bstr =- s/<[b]*>//g; Bstr =- s/ / /g; Bstr =- s/\s+/\n/g; p r i n t $str;
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SECTION 94
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INTERPRETERS COMPILERS, AND VIRTUAL MACHINES
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This example is cryptic if one does not speak Perl The construction
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substitutes the string rep1 for the text in s t r that matches (leftmost longest) the regular expression regexp; the trailing g, for "global," means to do so for all matches in the string rather than just the first The metacharacter sequence \s is shorthand for a white space character (blank, tab, newline, and the like); \n is a newline The string "  ;" is an HTML character, like those in 2, that defines a non-breakable space character Putting all this together, here is a moronic but functional web browser, implemented as a one-line shell script:
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# web: r e t r i e v e web page and format i t s t e x t , ignoring HTML
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g e t u r l t c l $1 I unhtml p l
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I f m t awk
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This retrieves the web page, discards all the control and formatting information, and formats the text by its own rules It's a fast way to grab a page of text from the web Notice the variety of languages we cascade together, each suited to a particular task: Tcl, Perl, Awk and, within each of those, regular expressions The power of notation comes from having a good one for each problem Tcl is particularly good for grabbing text over the network; Perl and Awk are good at editing and formatting text; and of course regular expressions are good at specifying pieces of text for searching and modifying These languages together are more powerful than any one of them in isolation It's worth breaking the job into pieces if it enables you to profit from the right notation
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94 Interpreters, Compilers, and Virtual Machines
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How does a program get from its source-code form into execution If the language is simple enough, as in p r i n t f or our simplest regular expressions, we can execute straight from the source This is easy and has very fast startup There is a tradeoff between setup time and execution speed If the language is more complicated, it is generally desirable to convert the source code into a convenient and efficient internal representation for execution It takes some time to process the source originally but this is repaid in faster execution Programs that combine the conversion and execution into a single program that reads the source text, converts it and runs it are called interpreters Awk and Perl interpret, as do many other scripting and special-purpose languages A third possibility is to generate instructions for the specific kind of computer the program is meant to run on, as compilers do This requires the most up-front effort and time but yields the fastest subsequent execution
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NOTATION
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Other combinations exist One that we will study in this section is compiling a program into instructions for a made-up computer (a virtual machine) that can be simulated on any real computer A virtual machine combines many of the advantages of conventional interpretation and compilation If a language is simple, it doesn't take much processing to infer the program stmcture and convert it to an internal form If, however, the language has some complexity-declarations nested structures, recursively-defined statements or expressions, operators with precedence, and the like- is more complicated to parse the it input to determine the structure Parsers are often written with the aid of an automatic parser generator, also called a compiler-compiler such as yacc or bison Such programs translate a description of the language, called its grammar, into (typically) a C or C++ program that, once compiled, will translate statements in the language into an internal representation Of course, generating a parser directly from a grammar is another demonstration of the power of good notation The representation produced by a parser is usually a tree, with internal nodes containing operators and leaves containing operands A statement such as
might produce this parse (or syntax) tree:
Many of the tree algorithms described in 2 can be used to build and process parse trees Once the tree is built, there are a variety of ways to proceed The most direct, used in Awk, is to walk the tree directly, evaluating the nodes as we go A simplified version of such an evaluation routine for an integer-based expression language might involve a post-order traversal like this:
typedef s t r u c t Symbol Symbol ; typedef s t r u c t Tree Tree; s t r u c t Symbol { in t v a l ue ; char *name;