I'm playing around with Martini, and for some reason I can't get the contrib binding package to work.
My struct isn't having the values bound to. I've reduced the code down to it's simplest form, but it still doesn't work.
Can anyone see what I'm doing wrong?
package main
import (
"github.com/go-martini/martini"
"github.com/martini-contrib/binding"
"net/http"
)
var html string = `<form method="POST" enctype="application/x-www-form-urlencoded"><input name="un" type="text" /><input type="submit" value="Some button" /></form>`
type FormViewModel struct {
Username string `form: "un"`
}
func main() {
m := martini.Classic()
m.Get("/", func(w http.ResponseWriter) {
w.Header().Add("content-type", "text/html")
w.Write([]byte(html))
})
m.Post("/", binding.Form(FormViewModel{}), func(vm FormViewModel) string {
return "You entered: " + vm.Username
})
m.Run()
}
It is just a parsing issue in the definition of the tag associated to the field of the structure.
You need to remove the blank character after form:
If you write the structure as follows:
type FormViewModel struct {
Username string `form:"un"` // No blank after form:
}
... it should work better.
The Go language specification says:
By convention, tag strings are a concatenation of optionally space-separated key:"value" pairs. Each key is a non-empty string consisting of non-control characters other than space (U+0020 ' '), quote (U+0022 '"'), and colon (U+003A ':'). Each value is quoted using U+0022 '"' characters and Go string literal syntax.
Apparently, the parser implemented in the reflect package does not tolerate a space after the colon.
Related
Goal of this expression is separate mathematic calculations into operators, symbols, numbers and brackets.
For example:
Input string: 1+3-6*(12-3+4/5)
Output list: 1, +, 3, -, 6, *, (12-3+4/5)
So I built this expression.
It is working on the web page, but in the Dart code this happens:
final calculationExpression = RegExp(
r"/(\(([a-zA-Z0-9-+/*]+)\))|([a-zA-Z0-9]+)|([+/*-]{1})/g",
unicode: true,
multiLine: true,
);
...
List<String> operators = calculationsString.split(calculationExpression); /// Output: ["", "+", "-", ...]
What did I do wrong?
The syntax /pattern/g is used to create regular expression literals in JavaScript (and sed and some other languages), just as quotes are used to create string literals. Dart doesn't have regular expression literals; you instead must invoke the RegExp constructor directly. Combining a regular expression literal syntax with an explicitly constructed RegExp object makes no sense. When you do RegExp(r'/pattern1|pattern2|pattern3/g'), you're actually matching against /pattern1 (pattern1 prefixed with a literal / character) or pattern2 or pattern3/g (pattern3 followed by a literal string /g).
String.split does not split the input string such that each element of the result matches the pattern. It treats all matches of the pattern as separators. Consequently, the resulting list will not have any elements that match the pattern, which is the opposite of what you want. You instead want to find all matches of the pattern in the string. You instead can use RegExp.allMatches if you additionally verify that the input string contains only matches from the regular expression.
Putting it all together:
void main() {
final calculationExpression = RegExp(
r"(\(([a-zA-Z0-9-+/*]+)\))|([a-zA-Z0-9]+)|([+/*-]{1})",
unicode: true,
multiLine: true,
);
var calculationsString = '1+3-6*(12-3+4/5)';
// Prints: [1, +, 3, -, 6, *, (12-3+4/5)]
print(calculationsString.tokenizeFrom(calculationExpression).toList());
}
extension on String {
Iterable<String> tokenizeFrom(RegExp regExp) sync* {
void failIf(bool condition) {
if (condition) {
throw FormatException(
'$this contains characters that do not match $regExp',
);
}
}
var matches = regExp.allMatches(this);
var lastEnd = 0;
for (var match in matches) {
// Verify that there aren't unmatched characters.
failIf(match.start != lastEnd);
lastEnd = match.end;
yield match.group(0)!;
}
failIf(lastEnd != length);
}
}
You put the JavaScript regexp literal slashes and flags inside the Dart string.
If you remove the leading / and trailing /g, you get the RegExp you intended to.
The multiLine and unicode flags are unnecessary (your regexp doesn't use any feature affected by those)
The Dart split function does not emit capture groups, so you probably want to look at getting the matches, not removing them, which is what split does.
All in all, try:
final calculationExpression = RegExp(
r"\([a-zA-Z\d\-+/*]+\)|[a-zA-Z\d]+|[+/*\-]");
List<String> tokes =
calculationExpression.allMatches(calculationsString).toList();
I am writing some DXL for use as a DXL column that for each object in a module, looks at the in-links and returns the link name. Then if the link name starts with "verif", it will get the object text from an attribute "TestResultFloating" in the linked module and show it in the current module, in the DXL column.
The problem I will have when I use this on the whole database (currently I am just using a sandbox) is that some of the modules linked through the "verif" link module will not contain the "TestResultFloating" attribute. For these I would like to oppress the 'unknown Object attribute (TestResultFloating)' error and instead display something like N/A for that Object in the current module.
Below is my code that currently works as long as the "TestResultFloating" attribute is present in the linked module, but will throw the error if the attribute is not present.
ModName_ mSrc
Object o = current
Object nObject
Object oSrc, oDest
LinkRef lr = null
Link l = null
string linkname = ""
string attrbName = "TestResultFloating"
for mSrc in (obj <- "*") do {
if (!open(mSrc)) {
read(fullName(mSrc), true)
}
}
for l in (obj <- "*") do {
oSrc = source(l)
linkname = name(module(l))
string linkmodname = upper(linkname[0:4])
if(linkmodname == "VERIF") {
string objText = oSrc."TestResultFloating"
display(objText)
}
}
I tried one way of doing it which I got from the dxl reference manual which was to check whether the attribute exists and then do the operation. This is what I added but it doesn't seem to work, I still get the same error "unknown Object attribute (TestResultFloating)"
What I tried is shown below:
if(linkmodname == "VERIF") {
if(exists attribute "TestResultFloating"){
string objText = oSrc."TestResultFloating"
display(objText)
}
else {
display("N/A")
}
}
Please also note that i'm very new to DOORS and DXL so if I am doing something drastically wrong or I am asking a simple question please forgive me.
There is a utility function called string probeAttr_(Object o, string attrName) that can be used for getting an attribute value if you are not sure whether the attribute is readable or whether it even exists.
This function and a lot of similar functions tailored for different circumstances can be found in the file "c:\Program Files\IBM\Rational\DOORS\9.6\lib\dxl\utils\attrutil.inc"
I know how to split the string within a Controller or Domain class.
But i want to split the string inside the GSP.
My string will look like:
ASD25785-T
I want to be able to split this into 2 strings inside the GSP view.
String a = ASD25785
String b = T
Is it possible to do that inside the GSP?
How about something like this:
<%
String[] tokens = "ASD25785-T".split("-")
String b = tokens[0]
String c = tokens[1]
%>
NB. use try catch because you may get ArrayOutofBoundException
It depends if you have a predefind format or you want something generic.
Without try/catch and using the regex find method in String:
<%
String s="ASD25785-T"
String a,b
s.find(/(.+)-(.+)/) { fullMatch, first, second -> [
a=first
b=second
}
%>
If you are certain that there will always be a match, then it is a cute one-liner:
<%
String s="ASD25785-T"
def (a,b) = s.find(/(.+)-(.+)/) { fullMatch, first, second -> [first,second]}
%>
Source:
http://naleid.com/blog/2009/04/07/groovy-161-released-with-new-find-and-findall-regexp-methods-on-string
NB: However, if you want to use it in your view, you should create a tag. Grails taglibs are almost trivial to write, and much better to use in GSP code.
http://grails.github.io/grails-doc/2.4.x/ref/Command%20Line/create-tag-lib.html
http://grails.github.io/grails-doc/latest/guide/single.html#taglibs
Here's a string manipulation taglib
class StringsTaglib {
def split = { attrs, body ->
String input= attrs.input
String regex= attrs.regex
int position= attrs.index as Integer
out << input.split(regex)[position]
}
}
you could then use it like this:
a:<g:split input="ASD25785-T" regex="-" index="0"/>
b:<g:split input="ASD25785-T" regex="-" index="1"/>
I would like to create a helper to return a text one character below the other. Something like that:
S
A
M
P
L
E
The purpose of this helper is to have a table with a heading of only 1 character wide. As you can see on the picture below this is ugly:
Example below looks nice:
I would like something like:
#Html.DisplayVerticalFor(x => x.MyText)
Any idea?
Thanks.
You can create an HTML helper DisplayVertical. (I am not adding the steps of how to create html helpers). The DisplayVertical will first split your text in character array and wrap each character inside a div or any other block level element, which can be inserted desired place.The implementation of DisplayVerticalFor can be something like this :
public static MvcHtmlString DisplayVertical (this HtmlHelper helper, string text)
{
string OutputString = "";
string assembleString = "<div>{0}</div>";
char[] textarr = text.ToCharArray();
foreach( char a in textarr )
{
OutputString += String.Format(assembleString, a);
}
return new MvcHtmlString(OutputString);
}
and in razor it will placed like this :
<div class="style-to-adjust-width-n-height"> #Html.DisplayVertical ("Sample") </div>
If you want to pass on a lambda expression to this html helper like this #Html.DisplayVerticalFor(x => x.MyText) then you need to add lambda expression parsing code to find out the text.
Lastly, this is a very rough code however you can add "TagBuilder" etc to make it more neat and clean.
Suppose I have two domain objects, Document and Author
Class Document {
Author author
String title
}
Class Author {
String lastName
String firstName
String toString() {
return lastName + ", " + firstName
}
}
The view list.gsp looks something like this:
<g:sortableColumn property="title" title=... />
<g:sortableCOlumn property="author" title=... />
....
<td>${fieldValue(bean: documentInstance, field: "author"}></td>
<td>${fieldValue(bean: documentInstance, field: "title"}></td>
The displayed values in the table work as intended - the table row will show the author as (lastName, firstName) next to documentInstance.title.
However, clicking the Author column header to sort causes "documents" to be sorted by author.id .
What is the most expedient way to get sorting by author.toString() or "author.lastName, author.firstName" instead of sorting by author.id?
I'd prefer to avoid falling back to .withCriteria{} if possible - I have four different columns that need this functionality, and it seems like that would get messy.
You could use a derived property to create a virtual column to sort on:
Class Author {
String lastName
String firstName
String sortingName
static mapping {
// modify the SQL formula to use your DB's concatenation operator
sortingName formula: "`LAST_NAME` || ',' || `FIRST_NAME`)" // Standard SQL
}
String toString() { sortingName }
}
Then set your column to sortingName:
<g:sortableColumn property="author.sortingName" title=... />
(I'm kind of guessing here, but I think this should work.)
I'm just a Grails beginner so maybe my answer is not optimal, but this was the easiest way for me:
Instead of using Document.list(params) I used Document.findAll(). Is worth mentioning that in my application I do needed some kind of filter in my lists, so findAll() was the best approach. Anyways, here is how I would do it:
Document.findAll( "from Document as d order by d." + params.sort + ' ' + params.order, params ) //supports pagination
And in the View:
<g:sortableCOlumn property="author.lastName" title=... />