| 1 | /*
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| 2 | Package amber is an elegant templating engine for Go Programming Language.
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| 3 | It is inspired from HAML and Jade.
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| 4 |
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| 5 | Tags
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| 6 |
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| 7 | A tag is simply a word:
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| 8 |
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| 9 | html
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| 10 |
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| 11 | is converted to
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| 12 |
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| 13 | <html></html>
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| 14 |
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| 15 | It is possible to add ID and CLASS attributes to tags:
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| 16 |
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| 17 | div#main
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| 18 | span.time
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| 19 |
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| 20 | are converted to
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| 21 |
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| 22 | <div id="main"></div>
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| 23 | <span class="time"></span>
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| 24 |
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| 25 | Any arbitrary attribute name / value pair can be added this way:
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| 26 |
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| 27 | a[href="http://www.google.com"]
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| 28 |
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| 29 | You can mix multiple attributes together
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| 30 |
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| 31 | a#someid[href="/"][title="Main Page"].main.link Click Link
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| 32 |
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| 33 | gets converted to
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| 34 |
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| 35 | <a id="someid" class="main link" href="/" title="Main Page">Click Link</a>
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| 36 |
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| 37 | It is also possible to define these attributes within the block of a tag
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| 38 |
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| 39 | a
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| 40 | #someid
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| 41 | [href="/"]
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| 42 | [title="Main Page"]
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| 43 | .main
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| 44 | .link
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| 45 | | Click Link
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| 46 |
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| 47 | Doctypes
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| 48 |
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| 49 | To add a doctype, use `!!!` or `doctype` keywords:
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| 50 |
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| 51 | !!! transitional
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| 52 | // <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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| 53 |
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| 54 | or use `doctype`
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| 55 |
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| 56 | doctype 5
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| 57 | // <!DOCTYPE html>
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| 58 |
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| 59 | Available options: `5`, `default`, `xml`, `transitional`, `strict`, `frameset`, `1.1`, `basic`, `mobile`
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| 60 |
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| 61 | Tag Content
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| 62 |
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| 63 | For single line tag text, you can just append the text after tag name:
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| 64 |
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| 65 | p Testing!
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| 66 |
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| 67 | would yield
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| 68 |
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| 69 | <p>Testing!</p>
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| 70 |
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| 71 | For multi line tag text, or nested tags, use indentation:
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| 72 |
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| 73 | html
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| 74 | head
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| 75 | title Page Title
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| 76 | body
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| 77 | div#content
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| 78 | p
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| 79 | | This is a long page content
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| 80 | | These lines are all part of the parent p
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| 81 |
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| 82 | a[href="/"] Go To Main Page
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| 83 |
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| 84 | Data
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| 85 |
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| 86 | Input template data can be reached by key names directly. For example, assuming the template has been
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| 87 | executed with following JSON data:
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| 88 |
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| 89 | {
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| 90 | "Name": "Ekin",
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| 91 | "LastName": "Koc",
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| 92 | "Repositories": [
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| 93 | "amber",
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| 94 | "dateformat"
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| 95 | ],
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| 96 | "Avatar": "/images/ekin.jpg",
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| 97 | "Friends": 17
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| 98 | }
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| 99 |
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| 100 | It is possible to interpolate fields using `#{}`
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| 101 |
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| 102 | p Welcome #{Name}!
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| 103 |
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| 104 | would print
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| 105 |
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| 106 | <p>Welcome Ekin!</p>
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| 107 |
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| 108 | Attributes can have field names as well
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| 109 |
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| 110 | a[title=Name][href="/ekin.koc"]
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| 111 |
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| 112 | would print
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| 113 |
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| 114 | <a title="Ekin" href="/ekin.koc"></a>
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| 115 |
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| 116 | Expressions
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| 117 |
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| 118 | Amber can expand basic expressions. For example, it is possible to concatenate strings with + operator:
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| 119 |
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| 120 | p Welcome #{Name + " " + LastName}
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| 121 |
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| 122 | Arithmetic expressions are also supported:
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| 123 |
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| 124 | p You need #{50 - Friends} more friends to reach 50!
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| 125 |
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| 126 | Expressions can be used within attributes
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| 127 |
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| 128 | img[alt=Name + " " + LastName][src=Avatar]
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| 129 |
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| 130 | Variables
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| 131 |
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| 132 | It is possible to define dynamic variables within templates,
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| 133 | all variables must start with a $ character and can be assigned as in the following example:
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| 134 |
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| 135 | div
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| 136 | $fullname = Name + " " + LastName
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| 137 | p Welcome #{$fullname}
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| 138 |
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| 139 | If you need to access the supplied data itself (i.e. the object containing Name, LastName etc fields.) you can use `$` variable
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| 140 |
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| 141 | p $.Name
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| 142 |
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| 143 | Conditions
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| 144 |
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| 145 | For conditional blocks, it is possible to use `if <expression>`
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| 146 |
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| 147 | div
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| 148 | if Friends > 10
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| 149 | p You have more than 10 friends
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| 150 | else if Friends > 5
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| 151 | p You have more than 5 friends
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| 152 | else
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| 153 | p You need more friends
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| 154 |
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| 155 | Again, it is possible to use arithmetic and boolean operators
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| 156 |
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| 157 | div
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| 158 | if Name == "Ekin" && LastName == "Koc"
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| 159 | p Hey! I know you..
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| 160 |
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| 161 | There is a special syntax for conditional attributes. Only block attributes can have conditions;
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| 162 |
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| 163 | div
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| 164 | .hasfriends ? Friends > 0
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| 165 |
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| 166 | This would yield a div with `hasfriends` class only if the `Friends > 0` condition holds. It is
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| 167 | perfectly fine to use the same method for other types of attributes:
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| 168 |
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| 169 | div
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| 170 | #foo ? Name == "Ekin"
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| 171 | [bar=baz] ? len(Repositories) > 0
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| 172 |
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| 173 | Iterations
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| 174 |
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| 175 | It is possible to iterate over arrays and maps using `each`:
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| 176 |
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| 177 | each $repo in Repositories
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| 178 | p #{$repo}
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| 179 |
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| 180 | would print
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| 181 |
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| 182 | p amber
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| 183 | p dateformat
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| 184 |
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| 185 | It is also possible to iterate over values and indexes at the same time
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| 186 |
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| 187 | each $i, $repo in Repositories
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| 188 | p
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| 189 | .even ? $i % 2 == 0
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| 190 | .odd ? $i % 2 == 1
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| 191 |
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| 192 | Includes
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| 193 |
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| 194 | A template can include other templates using `include`:
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| 195 |
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| 196 | a.amber
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| 197 | p this is template a
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| 198 |
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| 199 | b.amber
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| 200 | p this is template b
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| 201 |
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| 202 | c.amber
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| 203 | div
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| 204 | include a
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| 205 | include b
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| 206 |
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| 207 | gets compiled to
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| 208 |
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| 209 | div
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| 210 | p this is template a
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| 211 | p this is template b
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| 212 |
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| 213 | Inheritance
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| 214 |
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| 215 | A template can inherit other templates. In order to inherit another template, an `extends` keyword should be used.
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| 216 | Parent template can define several named blocks and child template can modify the blocks.
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| 217 |
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| 218 | master.amber
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| 219 | !!! 5
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| 220 | html
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| 221 | head
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| 222 | block meta
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| 223 | meta[name="description"][content="This is a great website"]
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| 224 |
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| 225 | title
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| 226 | block title
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| 227 | | Default title
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| 228 | body
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| 229 | block content
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| 230 |
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| 231 | subpage.amber
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| 232 | extends master
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| 233 |
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| 234 | block title
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| 235 | | Some sub page!
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| 236 |
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| 237 | block append meta
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| 238 | // This will be added after the description meta tag. It is also possible
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| 239 | // to prepend something to an existing block
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| 240 | meta[name="keywords"][content="foo bar"]
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| 241 |
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| 242 | block content
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| 243 | div#main
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| 244 | p Some content here
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| 245 |
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| 246 | License
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| 247 | (The MIT License)
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| 248 |
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| 249 | Copyright (c) 2012 Ekin Koc <ekin@eknkc.com>
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| 250 |
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| 251 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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| 252 |
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| 253 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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| 254 |
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| 255 | THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 256 | */
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| 257 | package amber
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