Lasso is an open source programming language created in 1995 by Kyle Jessup.
| #125on PLDB | 29Years Old | 464Repos |
Lasso is an application server and server management interface used to develop internet applications and is a general-purpose, high-level programming language. Originally a web datasource connection tool, for Filemaker and later included in Apple Computer's FileMaker 4.0 and Claris Homepage as CDML, it has since evolved into a complex language used to develop and serve large-scale internet applications and web pages. Lasso includes a simple template system allowing code to control generation of HTML and other content types. Read more on Wikipedia...
// Hello world in Lasso
Hello world!
/**
trait_json_serialize
Objects with this trait will be assumed to convert to json data
when its ->asString method is called
*/
define trait_json_serialize => trait {
require asString()
}
define json_serialize(e::bytes)::string => ('"' + (string(#e)->Replace(`\`, `\\`) & Replace('\"', '\\"') & Replace('\r', '\\r') & Replace('\n', '\\n') & Replace('\t', '\\t') & Replace('\f', '\\f') & Replace('\b', '\\b') &) + '"')
define json_serialize(e::string)::string => ('"' + (string(#e)->Replace(`\`, `\\`) & Replace('\"', '\\"') & Replace('\r', '\\r') & Replace('\n', '\\n') & Replace('\t', '\\t') & Replace('\f', '\\f') & Replace('\b', '\\b') &) + '"')
define json_serialize(e::json_literal)::string => (#e->asstring)
define json_serialize(e::integer)::string => (#e->asstring)
define json_serialize(e::decimal)::string => (#e->asstring)
define json_serialize(e::boolean)::string => (#e->asstring)
define json_serialize(e::null)::string => ('null')
define json_serialize(e::date)::string => ('"' + #e->format(#e->gmt ? '%QT%TZ' | '%Q%T') + '"')
/*
define json_serialize(e::array)::string => {
local(output) = '';
local(delimit) = '';
#e->foreach => { #output += #delimit + json_serialize(#1); #delimit = ', '; }
return('[' + #output + ']');
}
define json_serialize(e::staticarray)::string => {
local(output) = '';
local(delimit) = '';
#e->foreach => { #output += #delimit + json_serialize(#1); #delimit = ', '; }
return('[' + #output + ']');
}
*/
define json_serialize(e::trait_forEach)::string => {
local(output) = '';
local(delimit) = '';
#e->foreach => { #output += #delimit + json_serialize(#1); #delimit = ', '; }
return('[' + #output + ']');
}
define json_serialize(e::map)::string => {
local(output = with pr in #e->eachPair
select json_serialize(#pr->first->asString) + ': ' + json_serialize(#pr->second))
return '{' + #output->join(',') + '}'
}
define json_serialize(e::json_object)::string => {
local(output) = '';
local(delimit) = '';
#e->foreachpair => { #output += #delimit + #1->first + ': ' + json_serialize(#1->second); #delimit = ', '; }
return('{' + #output + '}');
}
define json_serialize(e::trait_json_serialize) => #e->asString
define json_serialize(e::any)::string => json_serialize('<LassoNativeType>' + #e->serialize + '</LassoNativeType>')
// Bil Corry fixes for decoding json
define json_consume_string(ibytes::bytes) => {
local(obytes) = bytes;
local(temp) = 0;
while((#temp := #ibytes->export8bits) != 34);
#obytes->import8bits(#temp);
(#temp == 92) ? #obytes->import8bits(#ibytes->export8bits); // Escape \
/while;
local(output = string(#obytes)->unescape)
//Replace('\\"', '\"') & Replace('\\r', '\r') & Replace('\\n', '\n') & Replace('\\t', '\t') & Replace('\\f', '\f') & Replace('\\b', '\b') &;
if(#output->BeginsWith('<LassoNativeType>') && #output->EndsWith('</LassoNativeType>'));
Protect;
return serialization_reader(xml(#output - '<LassoNativeType>' - '</LassoNativeType>'))->read
/Protect;
else( (#output->size == 16 or #output->size == 15) and regexp(`\d{8}T\d{6}Z?`, '', #output)->matches)
return date(#output, -Format=#output->size == 16?`yyyyMMdd'T'HHmmssZ`|`yyyyMMdd'T'HHmmss`)
/if
return #output
}
// Bil Corry fix + Ke fix
define json_consume_token(ibytes::bytes, temp::integer) => {
local(obytes = bytes->import8bits(#temp) &,
delimit = array(9, 10, 13, 32, 44, 58, 93, 125)) // \t\r\n ,:]}
while(#delimit !>> (#temp := #ibytes->export8bits))
#obytes->import8bits(#temp)
/while
#temp == 125? // }
#ibytes->marker -= 1
//============================================================================
// Is also end of token if end of array[]
#temp == 93? // ]
#ibytes->marker -= 1
//............................................................................
local(output = string(#obytes))
#output == 'true'?
return true
#output == 'false'?
return false
#output == 'null'?
return null
string_IsNumeric(#output)?
return (#output >> '.')? decimal(#output) | integer(#output)
return #output
}
// Bil Corry fix
define json_consume_array(ibytes::bytes)::array => {
Local(output) = array;
local(delimit) = array( 9, 10, 13, 32, 44); // \t\r\n ,
local(temp) = 0;
While((#temp := #ibytes->export8bits) != 93); // ]
If(#delimit >> #temp);
// Discard whitespace
Else(#temp == 34); // "
#output->insert(json_consume_string(#ibytes));
Else(#temp == 91); // [
#output->insert(json_consume_array(#ibytes));
Else(#temp == 123); // {
#output->insert(json_consume_object(#ibytes));
Else;
#output->insert(json_consume_token(#ibytes, #temp));
(#temp == 93) ? Loop_Abort;
/If;
/While;
Return(#output);
}
// Bil Corry fix
define json_consume_object(ibytes::bytes)::map => {
Local('output' = map,
'delimit' = array( 9, 10, 13, 32, 44), // \t\r\n ,
'temp' = 0,
'key' = null,
'val' = null);
While((#temp := #ibytes->export8bits) != 125); // }
If(#delimit >> #temp);
// Discard whitespace
Else((#key !== null) && (#temp == 34)); // "
#output->insert(#key = json_consume_string(#ibytes));
#key = null;
Else((#key !== null) && (#temp == 91)); // [
#output->insert(#key = json_consume_array(#ibytes));
#key = null;
Else((#key !== null) && (#temp == 123)); // {
#output->insert(#key = json_consume_object(#ibytes));
#key = null;
Else((#key !== null));
#output->insert(#key = json_consume_token(#ibytes, #temp));
#key = null;
Else;
#key = json_consume_string(#ibytes);
while(#delimit >> (#temp := #ibytes->export8bits));
/while;
#temp != 58 ? Loop_Abort;
/If;
/While;
If((#output >> '__jsonclass__') && (#output->Find('__jsonclass__')->isa('array')) && (#output->Find('__jsonclass__')->size >= 2) && (#output->Find('__jsonclass__')->First == 'deserialize'));
Return(#output->find('__jsonclass__')->Second->First);
Else((#output >> 'native') && (#output >> 'comment') && (#output->find('comment') == 'http://www.lassosoft.com/json'));
Return(#output->find('native'));
/If;
Return(#output);
}
// Bil Corry fix + Ke fix
define json_deserialize(ibytes::bytes)::any => {
#ibytes->removeLeading(bom_utf8);
//============================================================================
// Reset marker on provided bytes
#ibytes->marker = 0
//............................................................................
Local(temp) = #ibytes->export8bits;
If(#temp == 91); // [
Return(json_consume_array(#ibytes));
Else(#temp == 123); // {
Return(json_consume_object(#ibytes));
else(#temp == 34) // "
return json_consume_string(#ibytes)
/If;
}
define json_deserialize(s::string) => json_deserialize(bytes(#s))
/**! json_literal - This is a subclass of String used for JSON encoding.
A json_literal works exactly like a string, but will be inserted directly
rather than being encoded into JSON. This allows JavaScript elements
like functions to be inserted into JSON objects. This is most useful
when the JSON object will be used within a JavaScript on the local page.
[Map: 'fn'=Literal('function(){ ...})] => {'fn': function(){ ...}}
**/
define json_literal => type {
parent string
}
/**! json_object - This is a subclass of Map used for JSON encoding.
An object works exactly like a map, but when it is encoded into JSON all
of the keys will be inserted literally. This makes it easy to create a
JavaScript object without extraneous quote marks.
Object('name'='value') => {name: "value"}
**/
define json_object => type {
parent map
public onCreate(...) => ..onCreate(:#rest or (:))
}
define json_rpccall(method::string, params=map, id='', host='') => {
#id == '' ? #host = Lasso_UniqueID;
#host == '' ? #host = 'http://localhost/lassoapps.8/rpc/rpc.lasso';
Return(Decode_JSON(Include_URL(#host, -PostParams=Encode_JSON(Map('method' = #method, 'params' = #params, 'id' = #id)))));
}
// Define type
define bottles_of_beer => type {
// Define internal data
data private bottles = 99
// Define private methods
private br => '<br/>'
private s => .bottles != 1 ? 's' | ''
// Generate lyrics when object represented as a string
public asstring => {
local(out = '')
// Use Lasso query syntax to generate the lyrics
with n in 99 to 1 by -1 do {
.bottles = #n
#out += .bottles + ' bottle' + .s + ' of beer on the wall, ' + .br
#out += .bottles + ' bottle' + .s + ' of beer; ' + .br
.bottles--
#out += 'Take one down, pass it around, ' + .br
#out += .bottles + ' bottle' + .s + ' of beer on the wall. ' + (.br * 2)
}
// Return result
return #out
}
}
bottles_of_beer| Feature | Supported | Token | Example |
|---|---|---|---|
| Booleans | ✓ | true false | |
| MultiLine Comments | ✓ | /* */ | /* A comment */ |
| Line Comments | ✓ | // | // A comment |
| Comments | ✓ | ||
| Semantic Indentation | X |