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doc/codelab/wiki: update to work with template changes, add to run.bash

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Fixes #1444.

R=rsc, r
CC=golang-dev
https://golang.org/cl/3979045
This commit is contained in:
Andrew Gerrand 2011-01-26 14:56:52 +10:00
parent b7949035d6
commit add4e167e3
17 changed files with 194 additions and 190 deletions
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6
doc/codelab/wiki/edit.html
View File

@ -1,6 +1,6 @@
<h1>Editing {title}</h1>
<h1>Editing {Title}</h1>
<form action="/save/{title}" method="POST">
<div><textarea name="body" rows="20" cols="80">{body|html}</textarea></div>
<form action="/save/{Title}" method="POST">
<div><textarea name="Body" rows="20" cols="80">{Body|html}</textarea></div>
<div><input type="submit" value="Save"></div>
</form>

22
doc/codelab/wiki/final-noclosure.go
View File

@ -8,23 +8,23 @@ import (
"template"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
func viewHandler(w http.ResponseWriter, r *http.Request) {
@ -47,7 +47,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
}
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
@ -58,7 +58,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
return
}
body := r.FormValue("body")
p := &page{title: title, body: []byte(body)}
p := &Page{Title: title, Body: []byte(body)}
err = p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -67,7 +67,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, err := template.ParseFile(tmpl+".html", nil)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)

18
doc/codelab/wiki/final-noerror.go
View File

@ -7,23 +7,23 @@ import (
"template"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
const lenPath = len("/view/")
@ -32,7 +32,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
t, _ := template.ParseFile("edit.html", nil)
t.Execute(p, w)

22
doc/codelab/wiki/final-parsetemplate.go
View File

@ -8,23 +8,23 @@ import (
"template"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
@ -39,14 +39,14 @@ func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
func editHandler(w http.ResponseWriter, r *http.Request, title string) {
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
body := r.FormValue("body")
p := &page{title: title, body: []byte(body)}
p := &Page{Title: title, Body: []byte(body)}
err := p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -55,7 +55,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, err := template.ParseFile(tmpl+".html", nil)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)

22
doc/codelab/wiki/final-template.go
View File

@ -7,23 +7,23 @@ import (
"template"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
const lenPath = len("/view/")
@ -32,7 +32,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
@ -46,12 +46,12 @@ func viewHandler(w http.ResponseWriter, r *http.Request) {
func saveHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
body := r.FormValue("body")
p := &page{title: title, body: []byte(body)}
p := &Page{Title: title, Body: []byte(body)}
p.save()
http.Redirect(w, r, "/view/"+title, http.StatusFound)
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, _ := template.ParseFile(tmpl+".html", nil)
t.Execute(p, w)
}

22
doc/codelab/wiki/final.go
View File

@ -8,23 +8,23 @@ import (
"template"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
@ -39,14 +39,14 @@ func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
func editHandler(w http.ResponseWriter, r *http.Request, title string) {
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
renderTemplate(w, "edit", p)
}
func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
body := r.FormValue("body")
p := &page{title: title, body: []byte(body)}
p := &Page{Title: title, Body: []byte(body)}
err := p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -63,7 +63,7 @@ func init() {
}
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
err := templates[tmpl].Execute(p, w)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)

2
doc/codelab/wiki/htmlify.go
View File

@ -8,5 +8,5 @@ import (
func main() {
b, _ := ioutil.ReadAll(os.Stdin)
template.HTMLFormatter(os.Stdout, b, "")
template.HTMLFormatter(os.Stdout, "", b)
}

117
doc/codelab/wiki/index.html
View File

@ -71,14 +71,14 @@ declaration.
<p>
Let's start by defining the data structures. A wiki consists of a series of
interconnected pages, each of which has a title and a body (the page content).
Here, we define <code>page</code> as a struct with two fields representing
Here, we define <code>Page</code> as a struct with two fields representing
the title and body.
</p>
<pre>
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
</pre>
@ -86,33 +86,33 @@ type page struct {
The type <code>[]byte</code> means "a <code>byte</code> slice".
(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a>
for more on slices.)
The <code>body</code> element is a <code>[]byte</code> rather than
The <code>Body</code> element is a <code>[]byte</code> rather than
<code>string</code> because that is the type expected by the <code>io</code>
libraries we will use, as you'll see below.
</p>
<p>
The <code>page</code> struct describes how page data will be stored in memory.
The <code>Page</code> struct describes how page data will be stored in memory.
But what about persistent storage? We can address that by creating a
<code>save</code> method on <code>page</code>:
<code>save</code> method on <code>Page</code>:
</p>
<pre>
func (p *page) save() os.Error {
filename := p.title + &#34;.txt&#34;
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + &#34;.txt&#34;
return ioutil.WriteFile(filename, p.Body, 0600)
}
</pre>
<p>
This method's signature reads: "This is a method named <code>save</code> that
takes as its receiver <code>p</code>, a pointer to <code>page</code> . It takes
takes as its receiver <code>p</code>, a pointer to <code>Page</code> . It takes
no parameters, and returns a value of type <code>os.Error</code>."
</p>
<p>
This method will save the <code>page</code>'s <code>body</code> to a text
file. For simplicity, we will use the <code>title</code> as the file name.
This method will save the <code>Page</code>'s <code>Body</code> to a text
file. For simplicity, we will use the <code>Title</code> as the file name.
</p>
<p>
@ -120,7 +120,7 @@ The <code>save</code> method returns an <code>os.Error</code> value because
that is the return type of <code>WriteFile</code> (a standard library function
that writes a byte slice to a file). The <code>save</code> method returns the
error value, to let the application handle it should anything go wrong while
writing the file. If all goes well, <code>page.save()</code> will return
writing the file. If all goes well, <code>Page.save()</code> will return
<code>nil</code> (the zero-value for pointers, interfaces, and some other
types).
</p>
@ -137,17 +137,17 @@ We will want to load pages, too:
</p>
<pre>
func loadPage(title string) *page {
func loadPage(title string) *Page {
filename := title + &#34;.txt&#34;
body, _ := ioutil.ReadFile(filename)
return &amp;page{title: title, body: body}
return &amp;Page{Title: title, Body: body}
}
</pre>
<p>
The function <code>loadPage</code> constructs the file name from
<code>title</code>, reads the file's contents into a new
<code>page</code>, and returns a pointer to that new <code>page</code>.
<code>Title</code>, reads the file's contents into a new
<code>Page</code>, and returns a pointer to that new <code>page</code>.
</p>
<p>
@ -161,23 +161,23 @@ error return value (in essence, assigning the value to nothing).
<p>
But what happens if <code>ReadFile</code> encounters an error? For example,
the file might not exist. We should not ignore such errors. Let's modify the
function to return <code>*page</code> and <code>os.Error</code>.
function to return <code>*Page</code> and <code>os.Error</code>.
</p>
<pre>
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + &#34;.txt&#34;
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &amp;page{title: title, body: body}, nil
return &amp;Page{Title: title, Body: body}, nil
}
</pre>
<p>
Callers of this function can now check the second parameter; if it is
<code>nil</code> then it has successfully loaded a page. If not, it will be an
<code>nil</code> then it has successfully loaded a Page. If not, it will be an
<code>os.Error</code> that can be handled by the caller (see the <a
href="http://golang.org/pkg/os/#Error">os package documentation</a> for
details).
@ -191,17 +191,17 @@ written:
<pre>
func main() {
p1 := &amp;page{title: &#34;TestPage&#34;, body: []byte(&#34;This is a sample page.&#34;)}
p1 := &amp;Page{Title: &#34;TestPage&#34;, Body: []byte(&#34;This is a sample Page.&#34;)}
p1.save()
p2, _ := loadPage(&#34;TestPage&#34;)
fmt.Println(string(p2.body))
fmt.Println(string(p2.Body))
}
</pre>
<p>
After compiling and executing this code, a file named <code>TestPage.txt</code>
would be created, containing the contents of <code>p1</code>. The file would
then be read into the struct <code>p2</code>, and its <code>body</code> element
then be read into the struct <code>p2</code>, and its <code>Body</code> element
printed to the screen.
</p>
@ -317,7 +317,7 @@ const lenPath = len(&#34;/view/&#34;)
func viewHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, _ := loadPage(title)
fmt.Fprintf(w, &#34;&lt;h1&gt;%s&lt;/h1&gt;&lt;div&gt;%s&lt;/div&gt;&#34;, p.title, p.body)
fmt.Fprintf(w, &#34;&lt;h1&gt;%s&lt;/h1&gt;&lt;div&gt;%s&lt;/div&gt;&#34;, p.Title, p.Body)
}
</pre>
@ -377,7 +377,7 @@ href="http://localhost:8080/view/test">http://localhost:8080/view/test</a></code
should show a page titled "test" containing the words "Hello world".
</p>
<h2>Editing pages</h2>
<h2>Editing Pages</h2>
<p>
A wiki is not a wiki without the ability to edit pages. Let's create two new
@ -401,7 +401,7 @@ func main() {
<p>
The function <code>editHandler</code> loads the page
(or, if it doesn't exist, create an empty <code>page</code> struct),
(or, if it doesn't exist, create an empty <code>Page</code> struct),
and displays an HTML form.
</p>
@ -410,14 +410,14 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &amp;page{title: title}
p = &amp;Page{Title: title}
}
fmt.Fprintf(w, &#34;&lt;h1&gt;Editing %s&lt;/h1&gt;&#34;+
&#34;&lt;form action=\&#34;/save/%s\&#34; method=\&#34;POST\&#34;&gt;&#34;+
&#34;&lt;textarea name=\&#34;body\&#34;&gt;%s&lt;/textarea&gt;&lt;br&gt;&#34;+
&#34;&lt;input type=\&#34;submit\&#34; value=\&#34;Save\&#34;&gt;&#34;+
&#34;&lt;/form&gt;&#34;,
p.title, p.title, p.body)
p.Title, p.Title, p.Body)
}
</pre>
@ -454,10 +454,10 @@ Open a new file named <code>edit.html</code>, and add the following lines:
</p>
<pre>
&lt;h1&gt;Editing {title}&lt;/h1&gt;
&lt;h1&gt;Editing {Title}&lt;/h1&gt;
&lt;form action=&#34;/save/{title}&#34; method=&#34;POST&#34;&gt;
&lt;div&gt;&lt;textarea name=&#34;body&#34; rows=&#34;20&#34; cols=&#34;80&#34;&gt;{body|html}&lt;/textarea&gt;&lt;/div&gt;
&lt;form action=&#34;/save/{Title}&#34; method=&#34;POST&#34;&gt;
&lt;div&gt;&lt;textarea name=&#34;Body&#34; rows=&#34;20&#34; cols=&#34;80&#34;&gt;{Body|html}&lt;/textarea&gt;&lt;/div&gt;
&lt;div&gt;&lt;input type=&#34;submit&#34; value=&#34;Save&#34;&gt;&lt;/div&gt;
&lt;/form&gt;
</pre>
@ -472,7 +472,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &amp;page{title: title}
p = &amp;Page{Title: title}
}
t, _ := template.ParseFile(&#34;edit.html&#34;, nil)
t.Execute(p, w)
@ -486,15 +486,15 @@ The function <code>template.ParseFile</code> will read the contents of
<p>
The method <code>t.Execute</code> replaces all occurrences of
<code>{title}</code> and <code>{body}</code> with the values of
<code>p.title</code> and <code>p.body</code>, and writes the resultant
<code>{Title}</code> and <code>{Body}</code> with the values of
<code>p.Title</code> and <code>p.Body</code>, and writes the resultant
HTML to the <code>http.ResponseWriter</code>.
</p>
<p>
Note that we've used <code>{body|html}</code> in the above template.
Note that we've used <code>{Body|html}</code> in the above template.
The <code>|html</code> part asks the template engine to pass the value
<code>body</code> through the <code>html</code> formatter before outputting it,
<code>Body</code> through the <code>html</code> formatter before outputting it,
which escapes HTML characters (such as replacing <code>&gt;</code> with
<code>&amp;gt;</code>).
This will prevent user data from corrupting the form HTML.
@ -511,11 +511,11 @@ While we're working with templates, let's create a template for our
</p>
<pre>
&lt;h1&gt;{title}&lt;/h1&gt;
&lt;h1&gt;{Title}&lt;/h1&gt;
&lt;p&gt;[&lt;a href=&#34;/edit/{title}&#34;&gt;edit&lt;/a&gt;]&lt;/p&gt;
&lt;p&gt;[&lt;a href=&#34;/edit/{Title}&#34;&gt;edit&lt;/a&gt;]&lt;/p&gt;
&lt;div&gt;{body}&lt;/div&gt;
&lt;div&gt;{Body}&lt;/div&gt;
</pre>
<p>
@ -548,12 +548,12 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &amp;page{title: title}
p = &amp;Page{Title: title}
}
renderTemplate(w, &#34;edit&#34;, p)
}
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, _ := template.ParseFile(tmpl+&#34;.html&#34;, nil)
t.Execute(p, w)
}
@ -568,8 +568,8 @@ The handlers are now shorter and simpler.
<p>
What if you visit <code>/view/APageThatDoesntExist</code>? The program will
crash. This is because it ignores the error return value from
<code>loadPage</code>. Instead, if the requested page doesn't exist, it should
redirect the client to the edit page so the content may be created:
<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should
redirect the client to the edit Page so the content may be created:
</p>
<pre>
@ -589,7 +589,7 @@ The <code>http.Redirect</code> function adds an HTTP status code of
header to the HTTP response.
</p>
<h2>Saving pages</h2>
<h2>Saving Pages</h2>
<p>
The function <code>saveHandler</code> will handle the form submission.
@ -599,7 +599,7 @@ The function <code>saveHandler</code> will handle the form submission.
func saveHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
body := r.FormValue(&#34;body&#34;)
p := &amp;page{title: title, body: []byte(body)}
p := &amp;Page{Title: title, Body: []byte(body)}
p.save()
http.Redirect(w, r, &#34;/view/&#34;+title, http.StatusFound)
}
@ -607,7 +607,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
<p>
The page title (provided in the URL) and the form's only field,
<code>body</code>, are stored in a new <code>page</code>.
<code>Body</code>, are stored in a new <code>Page</code>.
The <code>save()</code> method is then called to write the data to a file,
and the client is redirected to the <code>/view/</code> page.
</p>
@ -615,7 +615,7 @@ and the client is redirected to the <code>/view/</code> page.
<p>
The value returned by <code>FormValue</code> is of type <code>string</code>.
We must convert that value to <code>[]byte</code> before it will fit into
the <code>page</code> struct. We use <code>[]byte(body)</code> to perform
the <code>Page</code> struct. We use <code>[]byte(body)</code> to perform
the conversion.
</p>
@ -634,7 +634,7 @@ First, let's handle the errors in <code>renderTemplate</code>:
</p>
<pre>
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, err := template.ParseFile(tmpl+&#34;.html&#34;, nil)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -660,7 +660,7 @@ Now let's fix up <code>saveHandler</code>:
<pre>
func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
body := r.FormValue(&#34;body&#34;)
p := &amp;page{title: title, body: []byte(body)}
p := &amp;Page{Title: title, Body: []byte(body)}
err := p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -725,7 +725,7 @@ the <code>Execute</code> method on the appropriate <code>Template</code> from
<code>templates</code>:
<pre>
func renderTemplate(w http.ResponseWriter, tmpl string, p *page) {
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
err := templates[tmpl].Execute(p, w)
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -747,7 +747,6 @@ Then we can create a global variable to store our validation regexp:
</p>
<pre>
var titleValidator = regexp.MustCompile(&#34;^[a-zA-Z0-9]+$&#34;)
</pre>
<p>
@ -761,7 +760,7 @@ the expression compilation fails, while <code>Compile</code> returns an
<p>
Now, let's write a function that extracts the title string from the request
URL, and tests it against our <code>titleValidator</code> expression:
URL, and tests it against our <code>TitleValidator</code> expression:
</p>
<pre>
@ -807,7 +806,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
}
p, err := loadPage(title)
if err != nil {
p = &amp;page{title: title}
p = &amp;Page{Title: title}
}
renderTemplate(w, &#34;edit&#34;, p)
}
@ -818,7 +817,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
return
}
body := r.FormValue(&#34;body&#34;)
p := &amp;page{title: title, body: []byte(body)}
p := &amp;Page{Title: title, Body: []byte(body)}
err = p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)
@ -895,7 +894,7 @@ The closure returned by <code>makeHandler</code> is a function that takes
an <code>http.ResponseWriter</code> and <code>http.Request</code> (in other
words, an <code>http.HandlerFunc</code>).
The closure extracts the <code>title</code> from the request path, and
validates it with the <code>titleValidator</code> regexp. If the
validates it with the <code>TitleValidator</code> regexp. If the
<code>title</code> is invalid, an error will be written to the
<code>ResponseWriter</code> using the <code>http.NotFound</code> function.
If the <code>title</code> is valid, the enclosed handler function
@ -936,14 +935,14 @@ func viewHandler(w http.ResponseWriter, r *http.Request, title string) {
func editHandler(w http.ResponseWriter, r *http.Request, title string) {
p, err := loadPage(title)
if err != nil {
p = &amp;page{title: title}
p = &amp;Page{Title: title}
}
renderTemplate(w, &#34;edit&#34;, p)
}
func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
body := r.FormValue(&#34;body&#34;)
p := &amp;page{title: title, body: []byte(body)}
p := &amp;Page{Title: title, Body: []byte(body)}
err := p.save()
if err != nil {
http.Error(w, err.String(), http.StatusInternalServerError)

22
doc/codelab/wiki/notemplate.go
View File

@ -7,23 +7,23 @@ import (
"os"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
const lenPath = len("/view/")
@ -31,21 +31,21 @@ const lenPath = len("/view/")
func viewHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, _ := loadPage(title)
fmt.Fprintf(w, "<h1>%s</h1><div>%s</div>", p.title, p.body)
fmt.Fprintf(w, "<h1>%s</h1><div>%s</div>", p.Title, p.Body)
}
func editHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, err := loadPage(title)
if err != nil {
p = &page{title: title}
p = &Page{Title: title}
}
fmt.Fprintf(w, "<h1>Editing %s</h1>"+
"<form action=\"/save/%s\" method=\"POST\">"+
"<textarea name=\"body\">%s</textarea><br>"+
"<input type=\"submit\" value=\"Save\">"+
"</form>",
p.title, p.title, p.body)
p.Title, p.Title, p.Body)
}
func main() {

20
doc/codelab/wiki/part1-noerror.go
View File

@ -6,25 +6,25 @@ import (
"os"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) *page {
func loadPage(title string) *Page {
filename := title + ".txt"
body, _ := ioutil.ReadFile(filename)
return &page{title: title, body: body}
return &Page{Title: title, Body: body}
}
func main() {
p1 := &page{title: "TestPage", body: []byte("This is a sample page.")}
p1 := &Page{Title: "TestPage", Body: []byte("This is a sample page.")}
p1.save()
p2 := loadPage("TestPage")
fmt.Println(string(p2.body))
fmt.Println(string(p2.Body))
}

20
doc/codelab/wiki/part1.go
View File

@ -6,28 +6,28 @@ import (
"os"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
func main() {
p1 := &page{title: "TestPage", body: []byte("This is a sample page.")}
p1 := &Page{Title: "TestPage", Body: []byte("This is a sample Page.")}
p1.save()
p2, _ := loadPage("TestPage")
fmt.Println(string(p2.body))
fmt.Println(string(p2.Body))
}

18
doc/codelab/wiki/part2.go
View File

@ -7,23 +7,23 @@ import (
"os"
)
type page struct {
title string
body []byte
type Page struct {
Title string
Body []byte
}
func (p *page) save() os.Error {
filename := p.title + ".txt"
return ioutil.WriteFile(filename, p.body, 0600)
func (p *Page) save() os.Error {
filename := p.Title + ".txt"
return ioutil.WriteFile(filename, p.Body, 0600)
}
func loadPage(title string) (*page, os.Error) {
func loadPage(title string) (*Page, os.Error) {
filename := title + ".txt"
body, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return &page{title: title, body: body}, nil
return &Page{Title: title, Body: body}, nil
}
const lenPath = len("/view/")
@ -31,7 +31,7 @@ const lenPath = len("/view/")
func viewHandler(w http.ResponseWriter, r *http.Request) {
title := r.URL.Path[lenPath:]
p, _ := loadPage(title)
fmt.Fprintf(w, "<h1>%s</h1><div>%s</div>", p.title, p.body)
fmt.Fprintf(w, "<h1>%s</h1><div>%s</div>", p.Title, p.Body)
}
func main() {

6
doc/codelab/wiki/srcextract.go
View File

@ -6,6 +6,7 @@ import (
"go/parser"
"go/printer"
"go/ast"
"go/token"
"log"
"os"
)
@ -25,7 +26,8 @@ func main() {
os.Exit(2)
}
// load file
file, err := parser.ParseFile(*srcFn, nil, 0)
fs := token.NewFileSet()
file, err := parser.ParseFile(fs, *srcFn, nil, 0)
if err != nil {
log.Exit(err)
}
@ -47,7 +49,7 @@ func main() {
os.Exit(1)
}
b := new(bytes.Buffer)
p.Fprint(b, file)
p.Fprint(b, fs, file)
// drop package declaration
if !*showPkg {
for {

2
doc/codelab/wiki/test_edit.good
View File

@ -1,6 +1,6 @@
<h1>Editing Test</h1>
<form action="/save/Test" method="POST">
<div><textarea name="body" rows="20" cols="80"></textarea></div>
<div><textarea name="Body" rows="20" cols="80"></textarea></div>
<div><input type="submit" value="Save"></div>
</form>

6
doc/codelab/wiki/view.html
View File

@ -1,5 +1,5 @@
<h1>{title}</h1>
<h1>{Title}</h1>
<p>[<a href="/edit/{title}">edit</a>]</p>
<p>[<a href="/edit/{Title}">edit</a>]</p>
<div>{body}</div>
<div>{Body}</div>

56
doc/codelab/wiki/wiki.html
View File

@ -71,27 +71,27 @@ declaration.
<p>
Let's start by defining the data structures. A wiki consists of a series of
interconnected pages, each of which has a title and a body (the page content).
Here, we define <code>page</code> as a struct with two fields representing
Here, we define <code>Page</code> as a struct with two fields representing
the title and body.
</p>
<pre>
!./srcextract.bin -src=part1.go -name=page
!./srcextract.bin -src=part1.go -name=Page
</pre>
<p>
The type <code>[]byte</code> means "a <code>byte</code> slice".
(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a>
for more on slices.)
The <code>body</code> element is a <code>[]byte</code> rather than
The <code>Body</code> element is a <code>[]byte</code> rather than
<code>string</code> because that is the type expected by the <code>io</code>
libraries we will use, as you'll see below.
</p>
<p>
The <code>page</code> struct describes how page data will be stored in memory.
The <code>Page</code> struct describes how page data will be stored in memory.
But what about persistent storage? We can address that by creating a
<code>save</code> method on <code>page</code>:
<code>save</code> method on <code>Page</code>:
</p>
<pre>
@ -100,13 +100,13 @@ But what about persistent storage? We can address that by creating a
<p>
This method's signature reads: "This is a method named <code>save</code> that
takes as its receiver <code>p</code>, a pointer to <code>page</code> . It takes
takes as its receiver <code>p</code>, a pointer to <code>Page</code> . It takes
no parameters, and returns a value of type <code>os.Error</code>."
</p>
<p>
This method will save the <code>page</code>'s <code>body</code> to a text
file. For simplicity, we will use the <code>title</code> as the file name.
This method will save the <code>Page</code>'s <code>Body</code> to a text
file. For simplicity, we will use the <code>Title</code> as the file name.
</p>
<p>
@ -114,7 +114,7 @@ The <code>save</code> method returns an <code>os.Error</code> value because
that is the return type of <code>WriteFile</code> (a standard library function
that writes a byte slice to a file). The <code>save</code> method returns the
error value, to let the application handle it should anything go wrong while
writing the file. If all goes well, <code>page.save()</code> will return
writing the file. If all goes well, <code>Page.save()</code> will return
<code>nil</code> (the zero-value for pointers, interfaces, and some other
types).
</p>
@ -136,8 +136,8 @@ We will want to load pages, too:
<p>
The function <code>loadPage</code> constructs the file name from
<code>title</code>, reads the file's contents into a new
<code>page</code>, and returns a pointer to that new <code>page</code>.
<code>Title</code>, reads the file's contents into a new
<code>Page</code>, and returns a pointer to that new <code>page</code>.
</p>
<p>
@ -151,7 +151,7 @@ error return value (in essence, assigning the value to nothing).
<p>
But what happens if <code>ReadFile</code> encounters an error? For example,
the file might not exist. We should not ignore such errors. Let's modify the
function to return <code>*page</code> and <code>os.Error</code>.
function to return <code>*Page</code> and <code>os.Error</code>.
</p>
<pre>
@ -160,7 +160,7 @@ function to return <code>*page</code> and <code>os.Error</code>.
<p>
Callers of this function can now check the second parameter; if it is
<code>nil</code> then it has successfully loaded a page. If not, it will be an
<code>nil</code> then it has successfully loaded a Page. If not, it will be an
<code>os.Error</code> that can be handled by the caller (see the <a
href="http://golang.org/pkg/os/#Error">os package documentation</a> for
details).
@ -179,7 +179,7 @@ written:
<p>
After compiling and executing this code, a file named <code>TestPage.txt</code>
would be created, containing the contents of <code>p1</code>. The file would
then be read into the struct <code>p2</code>, and its <code>body</code> element
then be read into the struct <code>p2</code>, and its <code>Body</code> element
printed to the screen.
</p>
@ -334,7 +334,7 @@ href="http://localhost:8080/view/test">http://localhost:8080/view/test</a></code
should show a page titled "test" containing the words "Hello world".
</p>
<h2>Editing pages</h2>
<h2>Editing Pages</h2>
<p>
A wiki is not a wiki without the ability to edit pages. Let's create two new
@ -353,7 +353,7 @@ First, we add them to <code>main()</code>:
<p>
The function <code>editHandler</code> loads the page
(or, if it doesn't exist, create an empty <code>page</code> struct),
(or, if it doesn't exist, create an empty <code>Page</code> struct),
and displays an HTML form.
</p>
@ -413,15 +413,15 @@ The function <code>template.ParseFile</code> will read the contents of
<p>
The method <code>t.Execute</code> replaces all occurrences of
<code>{title}</code> and <code>{body}</code> with the values of
<code>p.title</code> and <code>p.body</code>, and writes the resultant
<code>{Title}</code> and <code>{Body}</code> with the values of
<code>p.Title</code> and <code>p.Body</code>, and writes the resultant
HTML to the <code>http.ResponseWriter</code>.
</p>
<p>
Note that we've used <code>{body|html}</code> in the above template.
Note that we've used <code>{Body|html}</code> in the above template.
The <code>|html</code> part asks the template engine to pass the value
<code>body</code> through the <code>html</code> formatter before outputting it,
<code>Body</code> through the <code>html</code> formatter before outputting it,
which escapes HTML characters (such as replacing <code>&gt;</code> with
<code>&amp;gt;</code>).
This will prevent user data from corrupting the form HTML.
@ -472,8 +472,8 @@ The handlers are now shorter and simpler.
<p>
What if you visit <code>/view/APageThatDoesntExist</code>? The program will
crash. This is because it ignores the error return value from
<code>loadPage</code>. Instead, if the requested page doesn't exist, it should
redirect the client to the edit page so the content may be created:
<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should
redirect the client to the edit Page so the content may be created:
</p>
<pre>
@ -486,7 +486,7 @@ The <code>http.Redirect</code> function adds an HTTP status code of
header to the HTTP response.
</p>
<h2>Saving pages</h2>
<h2>Saving Pages</h2>
<p>
The function <code>saveHandler</code> will handle the form submission.
@ -498,7 +498,7 @@ The function <code>saveHandler</code> will handle the form submission.
<p>
The page title (provided in the URL) and the form's only field,
<code>body</code>, are stored in a new <code>page</code>.
<code>Body</code>, are stored in a new <code>Page</code>.
The <code>save()</code> method is then called to write the data to a file,
and the client is redirected to the <code>/view/</code> page.
</p>
@ -506,7 +506,7 @@ and the client is redirected to the <code>/view/</code> page.
<p>
The value returned by <code>FormValue</code> is of type <code>string</code>.
We must convert that value to <code>[]byte</code> before it will fit into
the <code>page</code> struct. We use <code>[]byte(body)</code> to perform
the <code>Page</code> struct. We use <code>[]byte(body)</code> to perform
the conversion.
</p>
@ -610,7 +610,7 @@ Then we can create a global variable to store our validation regexp:
</p>
<pre>
!./srcextract.bin -src=final-noclosure.go -name=titleValidator
!./srcextract.bin -src=final-noclosure.go -name=TitleValidator
</pre>
<p>
@ -624,7 +624,7 @@ the expression compilation fails, while <code>Compile</code> returns an
<p>
Now, let's write a function that extracts the title string from the request
URL, and tests it against our <code>titleValidator</code> expression:
URL, and tests it against our <code>TitleValidator</code> expression:
</p>
<pre>
@ -708,7 +708,7 @@ The closure returned by <code>makeHandler</code> is a function that takes
an <code>http.ResponseWriter</code> and <code>http.Request</code> (in other
words, an <code>http.HandlerFunc</code>).
The closure extracts the <code>title</code> from the request path, and
validates it with the <code>titleValidator</code> regexp. If the
validates it with the <code>TitleValidator</code> regexp. If the
<code>title</code> is invalid, an error will be written to the
<code>ResponseWriter</code> using the <code>http.NotFound</code> function.
If the <code>title</code> is valid, the enclosed handler function

3
src/run.bash
View File

@ -103,6 +103,9 @@ if [[ $(uname | tr A-Z a-z | sed 's/mingw/windows/') != *windows* ]]; then
fi
) || exit $?
(xcd ../doc/codelab/wiki
gomake test) || exit $?
for i in ../misc/dashboard/builder ../misc/goplay
do
(xcd $i