Yahoo! search interface
From Rosetta Code
You are encouraged to solve this task according to the task description, using any language you may know.
Create a class for searching Yahoo! results. It must implement a Next Page method, and read URL, Title and Content from results.
Contents |
[edit] AutoHotkey
translated from python example
test:
yahooSearch("test", 1)
yahooSearch("test", 2)
return
yahooSearch(query, page)
{
global
start := ((page - 1) * 10) + 1
filedelete, search.txt
urldownloadtofile, % "http://search.yahoo.com/search?p=" . query
. "&b=" . start, search.txt
fileread, content, search.txt
reg = <a class="yschttl spt" href=".+?" >(.+?)</a></h3></div><div class="abstr">(.+?)</div><span class=url>(.+?)</span>
index := found := 1
while (found := regexmatch(content, reg, self, found + 1))
{
msgbox % title%A_Index% := fix(self1)
content%A_Index% := fix(self2)
url%A_Index% := fix(self3)
}
}
fix(url)
{
if pos := instr(url, "</a></h3></div>")
StringLeft, url, url, pos - 1
url := regexreplace(url, "<.*?>")
return url
}
[edit] C#
using System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class YahooSearch {
private string query;
private string content;
private int page = 1;
public YahooSearch(string query) {
this.query = query;
this.content = new WebClient().DownloadString("http://search.yahoo.com/search?p=" + query);
}
public YahooSearch(string query, int page) {
this.query = query;
this.page = page;
this.content = new WebClient().DownloadString(String.Format("http://search.yahoo.com/search?p={0}&b={1}", query,
((this.page - 1) * 10) + 1));
}
string Fix(string x) {
x = x.Replace("<b>", "").Replace("</b>", "").Replace("<wbr />", "").Replace("<wbr>", "").Replace("<b>...</b>", "");
int i = x.IndexOf("</a></h3>");
if (i > 0) return x.Substring(0, i);
else return x;
}
public YahooResult[] Results {
get {
ArrayList results = new ArrayList();
foreach (Match e in new Regex("<a class=\"yschttl spt\" href=\".+?\" >(.+?)</a>" +
"</h3></div>(?(<div class=\"sm-bd sm-nophoto\" id=\"sm-bd-4-1\">.+?</div>))" +
"<div class=\"abstr\">(.+?)</div><span class=url>(.+?)</span>").Matches(this.content)) {
string rurl = Fix(e.Groups[3].Value);
string rtitle = Fix(e.Groups[1].Value);
string rcontent = Fix(e.Groups[2].Value);
results.Add(new YahooResult(rurl, rtitle, rcontent));
}
return (YahooResult[])results.ToArray(typeof(YahooResult));
}
}
public YahooSearch NextPage() {
return new YahooSearch(this.query, this.page + 1);
}
public YahooSearch GetPage(int page) {
return new YahooSearch(this.query, page);
}
}
class YahooResult {
public string URL { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public YahooResult(string url, string title, string content) {
this.URL = url;
this.Title = title;
this.Content = content;
}
}
// Usage:
class Prog {
static void Main() {
YahooSearch x = new YahooSearch("test");
foreach (YahooResult result in x.Results) {
Console.WriteLine(result.Title);
}
}
}
[edit] GUISS
Start,Programs,Applications,Mozilla Firefox,Inputbox:address bar>www.yahoo.co.uk,
Button:Go,Area:browser window,Inputbox:searchbox>elephants,Button:Search
[edit] Icon and Unicon
The following uses the Unicon pre-processor and messaging extensions and won't run under Icon without significant modification. The code provides a suitable demonstration; however, could be made more robust by things such as URL escaping the search string
link printf,strings
procedure main()
YS := YahooSearch("rosettacode")
every 1 to 2 do { # 2 pages
YS.readnext()
YS.showinfo()
}
end
class YahooSearch(urlpat,page,response) #: class for Yahoo Search
method readnext() #: read the next page of search results
self.page +:= 1 # can't find as w|w/o self
readurl()
end
method readurl() #: read the url
url := sprintf(self.urlpat,(self.page-1)*10+1)
m := open(url,"m") | stop("Unable to open : ",url)
every (self.response := "") ||:= |read(m)
close(m)
self.response := deletec(self.response,"\x00") # kill stray NULs
end
method showinfo() #: show the info of interest
self.response ? repeat {
(tab(find("<")) & ="<a class=\"yschttl spt\" href=\"") | break
url := tab(find("\"")) & tab(find(">")+1)
title := tab(find("<")) & ="</a></h3></div>"
tab(find("<")) & =("<div class=\"abstr\">" | "<div class=\"sm-abs\">")
abstr := tab(find("<")) & ="</div>"
printf("\nTitle : %i\n",title)
printf("URL : %i\n",url)
printf("Abstr : %i\n",abstr)
}
end
initially(searchtext) #: initialize each instance
urlpat := sprintf("http://search.yahoo.com/search?p=%s&b=%%d",searchtext)
page := 0
end
printf.icn provides formatting strings.icn provides deletec
Sample Output (truncated):Title : "<b>Rosetta Code</b> - <b>Rosetta Code</b>" URL : "http://rosettacode.org/" Abstr : "<b>Rosetta Code</b> is a programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, t o demonstrate how ..." Title : "<b>Rosetta Code</b> - Wikipedia, the free <wbr />encyclopedia" URL : "http://en.wikipedia.org/wiki/Rosetta_Code" Abstr : " <b>Rosetta Code</b> is a wiki -based programming chrestomathy website with solutions to various programming problems in many different programming lan guages. It was created ..." Title : "Category:AutoHotkey - <b>Rosetta Code</b>" URL : "http://rosettacode.org/wiki/Category:AutoHotkey" Abstr : "Listed below are all of the tasks on <b>Rosetta Code</b> which have bee n solved using AutoHotkey." ... Title : "RosettaCON2011 Tutorials Collection | <wbr />RosettaCommons" URL : "http://www.rosettacommons.org/" Abstr : "Foldit in the news. Cooper et al. 2010 Predicting protein structures wi th a multiplayer online game, Nature 466 , 756 see also video. Rosetta-3.3 is no w available!" Title : "CALL: call a SUBROUTINE - HicEst: <wbr />Windows IDE programming ..." URL : "http://www.hicest.com/CALL.htm" Abstr : "\xe2\x87\x92 Example of a CALL call in "Roman_numerals" (<b>R osettaCode</b>) CALL transfers control to the first statement of a SUBROUTINE. C ALL subroutine_name[argument1, ..."
[edit] Java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class YahooSearch {
private String query;
// Page number
private int page = 1;
// Regexp to look for the individual results in the returned page
private static final Pattern pattern = Pattern.compile(
"<a class=\"yschttl spt\" href=\"[^*]+?\\*\\*([^\"]+?)\">(.+?)</a></h3>.*?<div class=\"(?:sm-abs|abstr)\">(.+?)</div>");
public YahooSearch(String query) {
this.query = query;
}
public List<YahooResult> search() throws MalformedURLException, URISyntaxException, IOException {
// Build the search string, starting with the Yahoo search URL,
// then appending the query and optionally the page number (if > 1)
StringBuilder searchUrl = new StringBuilder("http://search.yahoo.com/search?");
searchUrl.append("p=").append(URLEncoder.encode(query, "UTF-8"));
if (page > 1) {searchUrl.append("&b=").append((page - 1) * 10 + 1);}
// Query the Yahoo search engine
URL url = new URL(searchUrl.toString());
List<YahooResult> result = new ArrayList<YahooResult>();
StringBuilder sb = new StringBuilder();
// Get the search results using a buffered reader
BufferedReader in = null;
try {
in = new BufferedReader(new InputStreamReader(url.openStream()));
// Read the results line by line
String line = in.readLine();
while (line != null) {
sb.append(line);
line = in.readLine();
}
}
catch (IOException ioe) {
ioe.printStackTrace();
}
finally {
try {in.close();} catch (Exception ignoreMe) {}
}
String searchResult = sb.toString();
// Look for the individual results by matching the regexp pattern
Matcher matcher = pattern.matcher(searchResult);
while (matcher.find()) {
// Extract the result URL, title and excerpt
String resultUrl = URLDecoder.decode(matcher.group(1), "UTF-8");
String resultTitle = matcher.group(2).replaceAll("</?b>", "").replaceAll("<wbr ?/?>", "");
String resultContent = matcher.group(3).replaceAll("</?b>", "").replaceAll("<wbr ?/?>", "");
// Create a new YahooResult and add to the list
result.add(new YahooResult(resultUrl, resultTitle, resultContent));
}
return result;
}
public List<YahooResult> search(int page) throws MalformedURLException, URISyntaxException, IOException {
// Set the page number and search
this.page = page;
return search();
}
public List<YahooResult> nextPage() throws MalformedURLException, URISyntaxException, IOException {
// Increment the page number and search
page++;
return search();
}
public List<YahooResult> previousPage() throws MalformedURLException, URISyntaxException, IOException {
// Decrement the page number and search; if the page number is 1 return an empty list
if (page > 1) {
page--;
return search();
} else return new ArrayList<YahooResult>();
}
}
class YahooResult {
private URL url;
private String title;
private String content;
public URL getUrl() {
return url;
}
public void setUrl(URL url) {
this.url = url;
}
public void setUrl(String url) throws MalformedURLException {
this.url = new URL(url);
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public YahooResult(URL url, String title, String content) {
setUrl(url);
setTitle(title);
setContent(content);
}
public YahooResult(String url, String title, String content) throws MalformedURLException {
setUrl(url);
setTitle(title);
setContent(content);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
if (title != null) {
sb.append(",title=").append(title);
}
if (url != null) {
sb.append(",url=").append(url);
}
return sb.charAt(0) == ',' ? sb.substring(1) : sb.toString();
}
}
public class TestYahooSearch {
public static void main(String[] args) throws MalformedURLException, URISyntaxException, IOException {
// Create a new search
YahooSearch search = new YahooSearch("Rosetta code");
// Get the search results
List<YahooResult> results = search.search();
// Show the search results
for (YahooResult result : results) {
System.out.println(result.toString());
}
}
}
[edit] Oz
Instead of a class the implementation defines a function which returns a lazy list of result pages. This also makes it possible to request e.g. the first and the third page without any resources wasted on an unneeded second page.
We implement some simple parsing with logic programming. Regular expressions in Oz don't seem to support lazy quantification which makes parsing the result pages with them difficult.
declare
[HTTPClient] = {Module.link ['x-ozlib://mesaros/net/HTTPClient.ozf']}
[StringX] = {Module.link ['x-oz://system/String.ozf']}
[Regex] = {Module.link ['x-oz://contrib/regex']}
%% Displays page 1 and 3 of the search results.
%% The user can request and display more with context menu->Actions->Make Needed.
proc {ExampleUsage}
Pages = {YahooSearch "Rosetta code"}
in
{Inspector.configure widgetShowStrings true}
{ForAll {Nth Pages 1} Value.makeNeeded}
{ForAll {Nth Pages 3} Value.makeNeeded}
%% Display the infinite list of search result pages.
{Inspect Pages}
end
%% Returns a lazy list of pages.
%% A page is a lazy list of entries like this: result(url:U title:T content:C).
fun {YahooSearch Query}
FetchURL = {CreateURLFetcher}
fun {Page Nr}
StartResult = (Nr-1)*10+1
%% only retrieve it when really needed
Doc = {Value.byNeed fun {$}
{FetchURL "http://search.yahoo.com/search"
["p"#Query "b"#{Int.toString StartResult}]}
end}
RE = "<a class=\"yschttl spt\" href="
in
%% Lazily returns results.
%% In this way it is possible to build the pages list structure
%% without creating the single elements
%% (e.g. retrieve page 1 and 3 but not 2).
for Match in {Regex.allMatches RE Doc} yield:Yield do
Xs = {List.drop Doc Match.0.2}
in
{Yield {ParseEntry Xs}}
end
end
in
for PageNr in 1;PageNr+1 yield:Yield do
{Yield {Page PageNr}}
end
end
fun {CreateURLFetcher}
Client = {New HTTPClient.cgiGET
init(inPrms(toFile:false toStrm:true)
httpReqPrms
)}
%% close when no longer used
{Finalize.register Client proc {$ C} {C closeAll(true)} end}
fun {FetchURL Url Params}
OutParams
in
{Client getService(Url Params ?OutParams ?_)}
OutParams.sOut
end
in
FetchURL
end
%% Xs: String containing HtmL
%% Result: "result(url:U title:T content:C)" or "parseError"
fun {ParseEntry Xs}
proc {Parse Root}
R1 R2 R3 R4 R4 R5 R6 R7
Url = {Fix {QuotedString Xs R1}}
{Const ">" R1 R2}
Title = {Fix {Until "</a>" R2 R3}}
{Const "</h3></div>" R3 R4}
choice
%% "enchanted" result?
{Const "<div class=\"sm-bd sm-nophoto\" id=\"sm-bd-4-1\">" R4 R5}
{Until "</div>" R5 R6 _}
[] %% result with links into document
{Const "<div class=\"sm-bd sm-r\" id=\"sm-bd-8-1\">" R4 R5}
{Until "</ul></div>" R5 R6 _}
[] %% PDF file
{Const "<div class=\"format\">" R4 R5}
{Until "</a></div>" R5 R6 _}
[] %% With Review
{Const "<div class=\"sm-bd sm-r\" id=\"sm-bd-9-1\">" R4 R5}
R6 = nil %% no nice abstract when a review is there
[] %% normal result
R6 = R4
end
Abstract =
choice
{Const "<div class=\"abstr\">" R6 R7}
{Fix {Until "</div>" R7 _}}
[] {Const "<div class=\"sm-abs\">" R6 R7}
{Fix {Until "</div>" R7 _}}
[] ""
end
in
Root = result(url:Url title:Title content:Abstract)
end
in
{CondSelect {SearchOne Parse} 1 parseError}
end
%% Result: contents of Xs until M is found.
%% Xs = {Append M Yr}
fun {Until M Xs ?Yr}
L R
in
{List.takeDrop Xs {Length M} L R}
if L == M then Yr = R nil
elsecase Xs of X|Xr then X|{Until M Xr Yr}
[] nil then Yr = nil nil
end
end
%% Asserts that Xs starts with C. Returns the remainder in Ys.
proc {Const C Xs ?Ys}
{List.takeDrop Xs {Length C} C Ys}
end
%% Assert that a quoted string follows.
%% Returns the unquoted string and binds Ys to the remainder of Xs.
fun {QuotedString &"|Xs ?Ys}
fun {Loop Xs Ys}
case Xs of &\\|&"|Xr then &\\|&"|{Loop Xr Ys}
[] &"|Xr then Ys = Xr nil
[] X|Xr then X|{Loop Xr Ys}
end
end
in
{Loop Xs Ys}
end
%% Remove formatting tags.
fun {Fix Xs}
{Until "</a></h3>"
{FoldL ["<b>" "</b>" "<wbr />" "<wbr>" "<b>...</b>"]
fun {$ Ys Z}
{StringX.replace Ys Z ""}
end
Xs}
_}
end
in
{ExampleUsage}
[edit] Perl
package YahooSearch;
use Encode;
use HTTP::Cookies;
use WWW::Mechanize;
# --- Internals -------------------------------------------------
sub apply (&$)
{my $f = shift; local $_ = shift; $f->(); return $_;}
# We construct a cookie to get 100 results per page and prevent
# "enhanced results".
my $search_prefs = 'v=1&n=100&sm=' .
apply {s/([^a-zA-Z0-9])/sprintf '%%%02X', ord $1/ge}
join '|',
map {'!' . $_}
qw(hsb Zq0 XbM sss dDO VFM RQh uZ0 Fxe yCl GP4 FZK yNC mEG niH);
my $cookies = HTTP::Cookies->new;
$cookies->set_cookie(0, 'sB', $search_prefs, '/', 'search.yahoo.com');
my $mech = new WWW::Mechanize
(cookie_jar => $cookies,
stack_depth => 0);
sub read_page
{my ($next, $page, @results) =
($mech->find_link(text => 'Next >')->url,
decode 'iso-8859-1', $mech->content);
while ($page =~ m
{<h3> <a \s class="yschttl \s spt" \s
href=" ([^"]+) " \s* > #"
(.+?) </a>
.+?
<div \s class="abstr">
(.+?) </div>}xg)
{push @results, {url => $1, title => $2, content => $3};
foreach ( @{$results[-1]}{qw(title content)} )
{s/<.+?>//g;
$_ = encode 'utf8', $_;}}
return $next, \@results;}
# --- Methods ---------------------------------------------------
sub new
{my $invocant = shift;
my $class = ref($invocant) || $invocant;
$mech->get('http://search.yahoo.com/search?p=' . apply
{s/([^a-zA-Z0-9 ])/sprintf '%%%02X', ord $1/ge;
s/ /+/g;}
shift);
my ($next, $results) = read_page();
return bless {link_to_next => $next, results => $results}, $class;}
sub results
{@{shift()->{results}};}
sub next_page
{my $invocant = shift;
my $next = $invocant->{link_to_next};
unless ($next)
{$invocant->{results} = [];
return undef;}
$mech->get($next);
($next, my $results) = read_page();
$invocant->{link_to_next} = $next;
$invocant->{results} = $results;
return 1;}
[edit] PicoLisp
(load "@lib/http.l")
(de yahoo (Query Page)
(default Page 1)
(client "search.yahoo.com" 80
(pack
"search?p=" (ht:Fmt Query)
"&b=" (inc (* 10 (dec Page))) )
(make
(while (from "<a class=\"yschttl spt\" href=\"")
(link
(make
(link (till "\"" T)) # Url
(from "<b>")
(link (till "<" T)) # Title
(from "class=\"abstr\"")
(from ">")
(link # Content
(pack
(make
(loop
(link (till "<" T))
(T (eof))
(T (= "</div" (till ">" T)))
(char) ) ) ) ) ) ) ) ) ) )
Output:
: (more (yahoo "test"))
("http://www.test.com/" "Test" "Offers practice online tests for many ...
("http://www.test.com/aboutus.htm" "Test" "Test.com has a successful ...
("http://en.wikipedia.org/wiki/Test" "Test" "YUI Test is a testing ...
("http://en.wikipedia.org/wiki/F-test" "test " "test n. A procedure for ...
...
[edit] Python
import urllib
import re
def fix(x):
p = re.compile(r'<[^<]*?>')
return p.sub('', x).replace('&', '&')
class YahooSearch:
def __init__(self, query, page=1):
self.query = query
self.page = page
self.url = "http://search.yahoo.com/search?p=%s&b=%s" %(self.query, ((self.page - 1) * 10 + 1))
self.content = urllib.urlopen(self.url).read()
def getresults(self):
self.results = []
for i in re.findall('<a class="yschttl spt" href=".+?">(.+?)</a></h3></div>(.+?)</div>.*?<span class=url>(.+?)</span>', self.content):
title = fix(i[0])
content = fix(i[1])
url = fix(i[2])
self.results.append(YahooResult(title, content, url))
return self.results
def getnextpage(self):
return YahooSearch(self.query, self.page+1)
search_results = property(fget=getresults)
nextpage = property(fget=getnextpage)
class YahooResult:
def __init__(self,title,content,url):
self.title = title
self.content = content
self.url = url
# Usage:
x = YahooSearch("test")
for result in x.search_results:
print result.title
[edit] R
Rather than using regexes to find the content (like some of the other solutions here) this method parses the HTML and finds the appropriate sections.
YahooSearch <- function(query, page=1, .opts=list(), ignoreMarkUpErrors=TRUE)
{
if(!require(RCurl) || !require(XML))
{
stop("Could not load required packages")
}
# Replace " " with "%20", etc
query <- curlEscape(query)
# Retrieve page
b <- 10*(page-1)+1
theurl <- paste("http://uk.search.yahoo.com/search?p=",
query, "&b=", b, sep="")
webpage <- getURL(theurl, .opts=.opts)
# Save search for nextpage function
.Search <- list(query=query, page=page, .opts=.opts,
ignoreMarkUpErrors=ignoreMarkUpErrors)
assign(".Search", .Search, envir=globalenv())
# Parse HTML; retrieve results block
webpage <- readLines(tc <- textConnection(webpage)); close(tc)
if(ignoreMarkUpErrors)
{
pagetree <- htmlTreeParse(webpage, error=function(...){})
} else
{
pagetree <- htmlTreeParse(webpage)
}
findbyattr <- function(x, id, type="id")
{
ids <- sapply(x, function(x) x$attributes[type])
x[ids==id]
}
body <- pagetree$children$html$children$body
bd <- findbyattr(body$children$div$children, "bd")
left <- findbyattr(bd$div$children$div$children, "left")
web <- findbyattr(left$div$children$div$children, "web")
resol <- web$div$children$ol
#Get url, title, content from results
gettextfromnode <- function(x)
{
un <- unlist(x$children)
paste(un[grep("value", names(un))], collapse=" ")
}
n <- length(resol)
results <- list()
length(results) <- n
for(i in 1:n)
{
mainlink <- resol[[i]]$children$div$children[1]$div$children$h3$children$a
url <- mainlink$attributes["href"]
title <- gettextfromnode(mainlink)
contenttext <- findbyattr(resol[[i]]$children$div$children[2], "abstr", type="class")
if(length(contenttext)==0)
{
contenttext <- findbyattr(resol[[i]]$children$div$children[2]$div$children$div$children,
"sm-abs", type="class")
}
content <- gettextfromnode(contenttext$div)
results[[i]] <- list(url=url, title=title, content=content)
}
names(results) <- as.character(seq(b, b+n-1))
results
}
nextpage <- function()
{
if(exists(".Search", envir=globalenv()))
{
.Search <- get(".Search", envir=globalenv())
.Search$page <- .Search$page + 1L
do.call(YahooSearch, .Search)
} else
{
message("No search has been performed yet")
}
}
#Usage
YahooSearch("rosetta code")
nextpage()
[edit] Ruby
Uses to parse the HTML. Someone more skillful than I at XPath or CSS could tighten up theparse_html method.
require 'open-uri'
require 'hpricot'
SearchResult = Struct.new(:url, :title, :content)
class SearchYahoo
@@urlinfo = [nil, 'ca.search.yahoo.com', 80, '/search', nil, nil]
def initialize(term)
@term = term
@page = 1
@results = nil
@url = URI::HTTP.build(@@urlinfo)
end
def next_result
if not @results
@results = []
fetch_results
elsif @results.empty?
next_page
end
@results.shift
end
def fetch_results
@url.query = URI.escape("p=%s&b=%d" % [@term, @page])
doc = open(@url) { |f| Hpricot(f) }
parse_html(doc)
end
def next_page
@page += 10
fetch_results
end
def parse_html(doc)
doc.search("div#main").search("div").each do |div|
next unless div.has_attribute?("class") and div.get_attribute("class").index("res") == 0
result = SearchResult.new
div.search("a").each do |link|
next unless link.has_attribute?("class") and link.get_attribute("class") == "yschttl spt"
result.url = link.get_attribute("href")
result.title = link.inner_text
end
div.search("div").each do |abstract|
next unless abstract.has_attribute?("class") and abstract.get_attribute("class").index("abstr")
result.content = abstract.inner_text
end
@results << result
end
end
end
s = SearchYahoo.new("test")
15.times do |i|
result = s.next_result
puts i+1
puts result.title
puts result.url
puts result.content
puts
end
[edit] Run BASIC
'--------------------------------------------------------------------------
' send this from the server to the clients browser
'--------------------------------------------------------------------------
html "<table border=1 cellpadding=0 cellspacing=0 bgcolor=wheat>"
html "<tr><td align=center colspan=2>Yahoo Search</td></tr>"
html "<tr><td align=right>Find</td><td>"
textbox #find,findThis$,30
html "</td></tr><tr><td align=right>Page</td><td>"
textbox #page,findPage$,2
html "</td></tr><tr><td align=center colspan=2>"
button #s, "Search", [search]
html " "
button #ex, "Exit", [exit]
html "</td><td></td></tr></table>"
wait
'--------------------------------------------------------------------------
' get search stuff from the clients browser
'--------------------------------------------------------------------------
[search]
findThis$ = trim$(#find contents$())
findPage$ = trim$(#page contents$())
findPage = max(val(findPage$),1) ' must be at least 1
'--------------------------------------------------------------------------
' sho page but keep user interface at the top by not clearing the page (cls)
' so they can change the search or page
' -------------------------------------------------------------------------
url$ = "http://search.yahoo.com/search?p=";findThis$;"&b=";((findPage - 1) * 10) + 1
html httpget$(url$)
wait
[exit]
cls ' clear browser screen and get outta here
wait
This user input sits at the top of the yahoo page so they can select a new search or page
[edit] Tcl
package require http
proc fix s {
string map {<b>...</b> "" <b> "" </b> "" <wbr> "" "<wbr />" ""} \
[regsub "</a></h3></div>.*" $s ""]
}
proc YahooSearch {term {page 1}} {
# Build the (ugly) scraper URL
append re {<a class="yschttl spt" href=".+?" >(.+?)</a></h3>}
append re {</div><div class="abstr">(.+?)}
append re {</div><span class=url>(.+?)</span>}
# Perform the query; note that this handles special characters
# in the query term correctly
set q [http::formatQuery p $term b [expr {$page*10-9}]]
set token [http::geturl http://search.yahoo.com/search?$q]
set data [http::data $token]
http::cleanup $token
# Assemble the results into a nice list
set results {}
foreach {- title content url} [regexp -all -inline $re $data] {
lappend results [fix $title] [fix $content] [fix $url]
}
# set up the call for the next page
interp alias {} Nextpage {} YahooSearch $term [incr page]
return $results
}
# Usage: get the first two pages of results
foreach {title content url} [YahooSearch "test"] {
puts $title
}
foreach {title content url} [Nextpage] {
puts $title
}
With Tcl 8.6, more options are available for managing the global state, through objects and coroutines. First, an object-based solution that takes the basic YahooSearch functionality and dresses it up to be more Tcl-like:
package require Tcl 8.6
oo::class create WebSearcher {
variable page term results
constructor searchTerm {
set page 0
set term $searchTerm
my nextPage
}
# This next method *is* a very Tcl-ish way of doing iteration.
method for {titleVar contentsVar urlVar body} {
upvar 1 $titleVar t $contentsVar c $urlVar v
foreach {t c v} $results {
uplevel 1 $body
}
}
# Reuse the previous code for simplicity rather than writing it anew
# Of course, if we were serious about this, we'd put the code here properly
method nextPage {} {
set results [YahooSearch $term [incr page]]
return
}
}
# How to use. Note the 'foreach' method use below; new "keywords" as methods!
set ytest [WebSearcher new "test"]
$ytest for title - url {
puts "\"$title\" : $url"
}
$ytest nextPage
$ytest for title - url {
puts "\"$title\" : $url"
}
$ytest delete ;# standard method that deletes the object
However, the paradigm of an iterator is also interesting and is more appropriately supported through a coroutine. This version conceals the fact that the service produces output in pages; care should be taken with it because it can produce rather a lot of network traffic...
package require Tcl 8.6
proc yahoo! term {
coroutine yahoo![incr ::yahoo] apply {term {
yield [info coroutine]
while 1 {
set results [YahooSearch $term [incr step]]
if {[llength $results] == 0} {
return -code break
}
foreach {t c u} $results {
yield [dict create title $t content $c url $u]
}
}
}} $term
}
# test by getting first fifty titles...
set it [yahoo! "test"]
for {set i 50} {$i>0} {incr i -1} {
puts [dict get [$it] title]
after 300 ;# Slow the code down... :-)
}
Another approach: uses a class as specified in the task. Also, uses an html parser from tcllib (parsing html with regular expressions is a particular annoyance of mine).
package require Tcl 8.6
package require http
package require htmlparse
package require textutil::adjust
oo::class create yahoosearch {
method search {s} {
my variable searchterm page baseurl
set searchterm $s
set page 1
set baseurl {http://ca.search.yahoo.com/search}
}
method getresults {} {
my variable state results current_data
set results [list]
set current_data [dict create]
set state looking_for_results
htmlparse::parse -cmd [list [self] html_parser_callback] [my gethtml]
}
method nextpage {} {
my variable page
incr page 10
my getresults
}
method nextresult {} {
my variable results page
if { ! [info exists results]} {
my getresults
} elseif {[llength $results] == 0} {
my nextpage
}
set results [lassign $results result]
return $result
}
method gethtml {} {
my variable searchterm page baseurl
set url [format {%s?%s} $baseurl [::http::formatQuery p $searchterm b $page]]
set response [http::geturl $url]
set html [http::data $response]
http::cleanup $response
return $html
}
method html_parser_callback {tag slash param textBehindTheTag} {
my variable state results current_data
switch -exact -- $state {
looking_for_results {
if {$tag eq "div" && [string first {id="main"} $param] != -1} {
set state ready
}
}
ready {
if {($tag eq "div" && [string first {class="res} $param] != -1) ||
($tag eq "html" && $slash eq "/")
} { #" -- unbalanced quote disturbs syntax highlighting
if {[dict size $current_data] > 0} {lappend results $current_data}
set current_data [dict create]
set state getting_url
}
}
getting_url {
if {$tag eq "a" && [string match "*yschttl spt*" $param]} {
if {[regexp {href="(.+?)"} $param - url]} {
dict set current_data url $url
} else {
dict set current_data url "no href in tag params: '$param'"
}
dict set current_data title $textBehindTheTag
set state getting_title
}
}
getting_title {
if {$tag eq "a" && $slash eq "/"} {
set state looking_for_abstract
} else {
dict append current_data title $textBehindTheTag
}
}
looking_for_abstract {
if {$tag eq "span" && [string first {class="url} $param] != -1} {
set state ready
} elseif {$tag eq "div" && [string first {class="abstr} $param] != -1} {
dict set current_data abstract $textBehindTheTag
set state getting_abstract
}
}
getting_abstract {
if {$tag eq "div" && $slash eq "/"} {
set state ready
} else {
dict append current_data abstract $textBehindTheTag
}
}
}
}
}
yahoosearch create searcher
searcher search "search text here"
for {set x 1} {$x <= 15} {incr x} {
set result [searcher nextresult]
dict with result {
puts $title
puts $url
puts [textutil::adjust::indent [textutil::adjust::adjust $abstract] " "]
puts ""
}
}
[edit] TXR
The following gives us a shell utility which we can invoke with arguments like "rosetta 0" to get the first page of search results for "rosetta".
The two arguments are handled as if they were two lines of text from a data source using @(next :args). We throw an exception if there is no match (insufficient arguments are supplied). The @(cases) directive has strictly ordered evaluation, so the throw in the second branch does not happen if the first branch has a successful pattern match. If the similar @(maybe) or @(some) directives were used, this wouldn't work.
A little sprinkling of regex is used.
#!/usr/bin/txr -f
@(next :args)
@(cases)
@ QUERY
@ PAGE
@(or)
@ (throw error "specify query and page# (from zero)")
@(end)
@(next `!wget -O - http://search.yahoo.com/search?p=@QUERY\&b=@{PAGE}1 2> /dev/null`)
@(all)
@ (coll)<a class="yschttl spt" href="@URL" @/[^>]+/>@TITLE</a>@(end)
@(and)
@ (coll)<div class="@/abstr|sm-abs/">@ABSTR</div>@(end)
@(end)
@(output)
@ (repeat)
TITLE: @TITLE
URL: @URL
TEXT: @ABSTR
---
@ (end)
@(end)
Sample run:
$ ./yahoosearch.txr rosetta 0
TITLE: <b>Rosetta</b> | Partner With Our Interactive <wbr />Marketing Agency Today
URL: http://www.rosetta.com/Pages/default.aspx
TEXT: Learn about the fastest growing interactive marketing agency in the country - <b>Rosetta</b>. Our strategic marketing planning is custom built and connects you with your ...
---
TITLE: Official <b>Rosetta</b> Stone® - Learn a <wbr />Language Online - Language ...
URL: http://www.rosettastone.com/
TEXT: <b>Rosetta</b> Stone is the world's #1 language-learning software. Our comprehensive foreign language program provides language learning for individuals and language learning ...
---
TITLE: <b>Rosetta</b> (software) - Wikipedia, the <wbr />free encyclopedia
URL: http://en.wikipedia.org/wiki/Rosetta_(software)
TEXT: Rosettais a lightweight dynamic translatorfor Mac OS Xdistributed by Apple. It enabled applications compiled for the PowerPCfamily of processors to run on Apple systems that use...
---
TITLE: <b>Rosetta</b> (spacecraft) - Wikipedia, the <wbr />free encyclopedia
URL: http://en.wikipedia.org/wiki/Rosetta_space_probe
TEXT: Rosettais a robotic spacecraftof the European Space Agencyon a mission to study the comet 67P/ChuryumovâGerasimenko. <b>Rosetta </b>consists of two main elements: the <b>Rosetta </b>space probeand...
---
TITLE: Apple - Mac
URL: http://www.apple.com/mac/
TEXT: Discover the world of Mac. Check out MacBook, iMac, iLife, and more. Download QuickTime, Safari, and widgets for free.
---
TITLE: <b>Rosetta</b> | Free Music, Tour Dates, <wbr />Photos, Videos
URL: http://www.myspace.com/rosetta
TEXT: <b>Rosetta</b>'s official profile including the latest music, albums, songs, music videos and more updates.
---
TITLE: <b>Rosetta</b>
URL: http://rosettaband.com/
TEXT: Metal for astronauts. Philadelphia, since 2003. Contact us at rosettaband@gmail.com Twitter | Facebook
---
TITLE: <b>Rosetta</b>
URL: http://rosetta.jpl.nasa.gov/
TEXT: The <b>Rosetta</b> spacecraft is on its way to catch and land a robot on a comet! <b>Rosetta</b> will reach comet '67P/Churyumov-Gerasimenko' ('C-G') in 2014. The European Space Agency ...
---
TITLE: <b>Rosetta</b> : Multi-script Typography
URL: http://rosettatype.com/
TEXT: <b>Rosetta</b> is a new independent foundry with a strong focus on multi-script typography. We are committed to promote research and knowledge in that area and to support ...
---
TITLE: <b>Rosetta</b> (1999) - IMDb
URL: http://www.imdb.com/title/tt0200071/
TEXT: With Ãmilie Dequenne, Fabrizio Rongione, Anne Yernaux, Olivier Gourmet. Young and impulsive <b>Rosetta</b> lives with her alcoholic mother and, moved by despair, she will ...
---
Categories:
- Programming Tasks
- Programming environment operations
- Networking and Web Interaction
- AutoHotkey
- C sharp
- C sharp examples needing attention
- Examples needing attention
- GUISS
- Unicon
- Icon Programming Library
- Java
- Oz
- OzHttpClient
- Perl
- PicoLisp
- Python
- R
- RCurl
- XML
- Ruby
- Ruby examples needing attention
- RubyGems
- Hpricot
- Run BASIC
- Tcl
- Tcllib
- TXR
- Batch File/Omit
- Locomotive Basic/Omit
- Lotus 123 Macro Scripting/Omit
- M4/Omit
- ML/I/Omit
- Openscad/Omit
- PARI/GP/Omit
- PostScript/Omit
- Retro/Omit
- TI-83 BASIC/Omit
- TI-89 BASIC/Omit
- ZX Spectrum Basic/Omit
