Text.Glabrous

A minimalistic Mustache-like syntax, truly logic-less, pure Text template library

• Use only the simplest Mustache tag {{name}} called a variable.
• HTML agnostic

Template

data Template

Constructors

Template

Fields

• content :: ![Token]

Instances

Eq Template

Methods

(==) :: Template -> Template -> Bool

(/=) :: Template -> Template -> Bool

Show Template

Methods

showsPrec :: Int -> Template -> ShowS

show :: Template -> String

showList :: [Template] -> ShowS

type Tag = Text

Get a Template

fromText :: Text -> Either String Template

Build a Template from a Text.

λ>fromText "Glabrous templates use only the simplest Mustache tag: {{name}}."
Right (Template {content = [Literal "Glabrous templates use only the simplest Mustache tag: ",Tag "name",Literal "."]})

readTemplateFile :: FilePath -> IO (Either String Template)

Get a Template from a file.

Template operations

toText :: Template -> Text

Output the content of the given Template as it is, with its Tags, if they exist (no Context is processed).

tagsOf :: Template -> [Tag]

Get the list of Tags in the given Template.

isFinal :: Template -> Bool

True if a Template has no more Tag inside and can be used as a final Text.

writeTemplateFile :: FilePath -> Template -> IO ()

Write a Template to a file.

Context

data Context

Constructors

Context

Fields

• variables :: HashMap Text Text

Instances

Eq Context

Methods

(==) :: Context -> Context -> Bool

(/=) :: Context -> Context -> Bool

Show Context

Methods

showsPrec :: Int -> Context -> ShowS

show :: Context -> String

showList :: [Context] -> ShowS

FromJSON Context

Methods

parseJSON :: Value -> Parser Context

parseJSONList :: Value -> Parser [Context]

ToJSON Context

Methods

toJSON :: Context -> Value

toEncoding :: Context -> Encoding

toJSONList :: [Context] -> Value

toEncodingList :: [Context] -> Encoding

Get a Context

initContext :: Context

Build an empty Context.

fromList :: [(Text, Text)] -> Context

Build a Context from a list of Tags and replacement Texts.

λ>fromList [("something","something else"), ("etc.","...")]
Context {variables = fromList [("etc.","..."),("something","something else")]}

fromTemplate :: Template -> Context

Extract Tags from a Template and build a Context with all its variables empty.

Context operations

setVariables :: [(Text, Text)] -> Context -> Context

Populate with variables and/or update variables in the given Context.

λ>setVariables [("something","something new"), ("about","haskell")] context
Context {variables = fromList [("etc.","..."),("about","haskell"),("something","something new"),("name","")]}

deleteVariables :: [Text] -> Context -> Context

Delete variables from a Context by these names.

λ>deleteVariables ["something"] context
Context {variables = fromList [("etc.","..."),("about","haskell"),("name","")]}

unsetContext :: Context -> Maybe Context

Build Just a (sub)Context made of unset variables of the given context, or Nothing.

λ>unsetContext context
Just (Context {variables = fromList [("name","")]})

JSON Context file

readContextFile :: FilePath -> IO (Maybe Context)

Get a Context from a file.

writeContextFile :: FilePath -> Context -> IO ()

Write a Context to a file.

{
    "something": "something else"
    "etc.": "...",
}

initContextFile :: FilePath -> Context -> IO ()

Based on the given Context, write a Context file with all its variables empty.

{
    "something": ""
    "etc.": "",
}

Processing

process :: Template -> Context -> Text

Process, discard Tags which are not in the Context and leave them without replacement text in the final Text.

processWithDefault

Arguments

:: Text

Default replacement text

-> Template

-> Context

-> Text

Process and replace missing variables in Context with the given default replacement Text.

partialProcess :: Template -> Context -> Template

Process a (sub)Context present in the given template, leaving untouched, if they exist, other Tags, to obtain a new template.

data Result

Constructors

Final Text

Partial

Fields

• template :: !Template
• tags :: ![Tag]

Instances

Eq Result

Methods

(==) :: Result -> Result -> Bool

(/=) :: Result -> Result -> Bool

Show Result

Methods

showsPrec :: Int -> Result -> ShowS

show :: Result -> String

showList :: [Result] -> ShowS

partialProcess' :: Template -> Context -> Result

Process a (sub)Context present in the given template, and get either a Final Text or a new Template with the list of its Tags.

λ>partialProcess' template context
Partial {template = Template {content = [Literal "Some ",Tag "tags",Literal " are unused in this ",Tag "text",Literal "."]}, tags = ["tags","text"]}