'#!/usr/bin/env kal\n' Comment.Single

'\n'          Text

'# This demo executes GET requests in parallel and in series\n' Comment.Single

'# using `for` loops and `wait for` statements.\n' Comment.Single

'\n'          Text

'# Notice how the serial GET requests always return in order\n' Comment.Single

'# and take longer in total. Parallel requests come back in\n' Comment.Single

'# order of receipt.\n' Comment.Single

'\n'          Text

'http'        Name.Variable
' '           Text
'='           Operator
' '           Text
'require'     Name.Variable
' '           Text
"'"           Literal.String
'http'        Literal.String
"'"           Literal.String
'\n\n'        Text

'urls'        Name.Variable
' '           Text
'='           Operator
' '           Text
'['           Punctuation
"'"           Literal.String
'http://www.google.com' Literal.String
"'"           Literal.String
'\n        '  Text
"'"           Literal.String
'http://www.apple.com' Literal.String
"'"           Literal.String
'\n        '  Text
"'"           Literal.String
'http://www.microsoft.com' Literal.String
"'"           Literal.String
'\n        '  Text
"'"           Literal.String
'http://www.nodejs.org' Literal.String
"'"           Literal.String
'\n        '  Text
"'"           Literal.String
'http://www.yahoo.com' Literal.String
"'"           Literal.String
']'           Punctuation
'\n\n'        Text

'# This function does a GET request for each URL in series\n' Comment.Single

'# It will wait for a response from each request before moving on\n' Comment.Single

'# to the next request. Notice the output will be in the same order as the\n' Comment.Single

'# urls variable every time regardless of response time.\n' Comment.Single

'# It is a task rather than a function because it is called asynchronously\n' Comment.Single

'# This allows us to use `return` to implicitly call back\n' Comment.Single

'task'        Keyword.Declaration
' '           Text
'series_demo' Name.Function
'('           Punctuation
')'           Punctuation
'\n  '        Text
'# The `series` keyword is optional here (for loops are serial by default)\n' Comment.Single

'  '          Text
'total_time'  Name.Variable
' '           Text
'='           Operator
' '           Text
'0'           Literal.Number.Integer
'\n\n  '      Text
'for series'  Keyword
' '           Text
'url '        Name.Variable
'in'          Keyword
' '           Text
'urls\n    '  Name.Variable
'timer'       Name.Variable
' '           Text
'='           Operator
' '           Text
'new'         Keyword
' '           Text
'Date'        Name.Builtin
'\n\n    '    Text
'# we use the `safe` keyword because get is a "nonstandard" task\n' Comment.Single

'    '        Text
'# that does not call back with an error argument\n' Comment.Single

'    '        Text
'safe wait for' Keyword
' '           Text
'response '   Name.Variable
'from'        Keyword
' '           Text
'http.get '   Name.Variable
'url\n\n    ' Name.Variable
'delay'       Name.Variable
' '           Text
'='           Operator
' '           Text
'new'         Keyword
' '           Text
'Date'        Name.Builtin
'('           Punctuation
')'           Punctuation
' '           Text
'-'           Operator
' '           Text
'timer\n    ' Name.Variable
'total_time'  Name.Variable
' '           Text
'+='          Operator
' '           Text
'delay\n\n    ' Name.Variable
'print'       Name.Builtin
' '           Text
'"'           Literal.String
'GET '        Literal.String
'#{'          Literal.String.Interpol
'url'         Name.Variable
'}'           Literal.String.Interpol
' - '         Literal.String
'#{'          Literal.String.Interpol
'response.statusCode' Name.Variable
'}'           Literal.String.Interpol
' - '         Literal.String
'#{'          Literal.String.Interpol
'response.connection.bytesRead' Name.Variable
'}'           Literal.String.Interpol
' bytes - '   Literal.String
'#{'          Literal.String.Interpol
'delay'       Name.Variable
'}'           Literal.String.Interpol
' ms'         Literal.String
'"'           Literal.String
'\n'          Punctuation

'\n  '        Text
'# because we are in a task rather than a function, this actually exectutes a callback\n' Comment.Single

'  '          Text
'return'      Keyword
' '           Text
'total_time'  Name.Variable
'\n\n'        Text

'# This function does a GET request for each URL in parallel\n' Comment.Single

'# It will NOT wait for a response from each request before moving on\n' Comment.Single

'# to the next request. Notice the output will be determined by the order in which\n' Comment.Single

'# the requests complete!\n' Comment.Single

'task'        Keyword.Declaration
' '           Text
'parallel_demo' Name.Function
'('           Punctuation
')'           Punctuation
'\n  '        Text
'total_time'  Name.Variable
' '           Text
'='           Operator
' '           Text
'0'           Literal.Number.Integer
'\n\n  '      Text
'# The `parallel` keyword is only meaningful here because the loop contains\n' Comment.Single

'  '          Text
'# a `wait for` statement (meaning callbacks are used)\n' Comment.Single

'  '          Text
'for parallel' Keyword
' '           Text
'url '        Name.Variable
'in'          Keyword
' '           Text
'urls\n    '  Name.Variable
'timer'       Name.Variable
' '           Text
'='           Operator
' '           Text
'new'         Keyword
' '           Text
'Date'        Name.Builtin
'\n\n    '    Text
'# we use the `safe` keyword because get is a "nonstandard" task\n' Comment.Single

'    '        Text
'# that does not call back with an error argument\n' Comment.Single

'    '        Text
'safe wait for' Keyword
' '           Text
'response '   Name.Variable
'from'        Keyword
' '           Text
'http.get '   Name.Variable
'url\n\n    ' Name.Variable
'delay'       Name.Variable
' '           Text
'='           Operator
' '           Text
'new'         Keyword
' '           Text
'Date'        Name.Builtin
'('           Punctuation
')'           Punctuation
' '           Text
'-'           Operator
' '           Text
'timer\n    ' Name.Variable
'total_time'  Name.Variable
' '           Text
'+='          Operator
' '           Text
'delay\n\n    ' Name.Variable
'print'       Name.Builtin
' '           Text
'"'           Literal.String
'GET '        Literal.String
'#{'          Literal.String.Interpol
'url'         Name.Variable
'}'           Literal.String.Interpol
' - '         Literal.String
'#{'          Literal.String.Interpol
'response.statusCode' Name.Variable
'}'           Literal.String.Interpol
' - '         Literal.String
'#{'          Literal.String.Interpol
'response.connection.bytesRead' Name.Variable
'}'           Literal.String.Interpol
' bytes - '   Literal.String
'#{'          Literal.String.Interpol
'delay'       Name.Variable
'}'           Literal.String.Interpol
'ms'          Literal.String
'"'           Literal.String
'\n'          Punctuation

'\n  '        Text
'# because we are in a task rather than a function, this actually exectutes a callback\n' Comment.Single

'  '          Text
'return'      Keyword
' '           Text
'total_time\n\n' Name.Variable

'print'       Name.Builtin
' '           Text
"'"           Literal.String
'Series Requests...' Literal.String
"'"           Literal.String
'\n'          Text

'wait for'    Keyword
' '           Text
'time1 '      Name.Variable
'from'        Keyword
' '           Text
'series_demo' Name.Variable
'('           Punctuation
')'           Punctuation
'\n'          Punctuation

'print'       Name.Builtin
' '           Text
'"'           Literal.String
'Total duration ' Literal.String
'#{'          Literal.String.Interpol
'time1'       Name.Variable
'}'           Literal.String.Interpol
'ms'          Literal.String
'"'           Literal.String
'\n\n'        Text

'print'       Name.Builtin
' '           Text
"'"           Literal.String
"'"           Literal.String
'\n\n'        Text

'print'       Name.Builtin
' '           Text
"'"           Literal.String
'Parallel Requests...' Literal.String
"'"           Literal.String
'\n'          Text

'wait for'    Keyword
' '           Text
'time2 '      Name.Variable
'from'        Keyword
' '           Text
'parallel_demo' Name.Variable
'('           Punctuation
')'           Punctuation
'\n'          Punctuation

'print'       Name.Builtin
' '           Text
'"'           Literal.String
'Total duration ' Literal.String
'#{'          Literal.String.Interpol
'time2'       Name.Variable
'}'           Literal.String.Interpol
'ms'          Literal.String
'"'           Literal.String
'\n'          Text