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Lasso

Lasso

Lasso is a pl created in 1995 by Kyle Jessup.

#138on PLDB 27Years Old 396Users
0Books 4Papers 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...


Example from the Hello World Collection:
// Hello world in Lasso Hello world!
Example from Linguist:
/** 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))))); }
Example from Wikipedia:
// 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

Language features

Feature Supported Example Token
Booleans true false
MultiLine Comments
/* A comment
*/
/* */
Line Comments
// A comment
//
Comments
Semantic Indentation ϴ

Publications about Lasso from Semantic Scholar

title authors year citations influentialCitations
The Lasso Problem and Uniqueness R. Tibshirani 2012 433 61
Efficient block-coordinate descent algorithms for the Group Lasso Zhiwei Qin and K. Scheinberg and D. Goldfarb 2013 177 15
A Dynamic Programming Algorithm for the Fused Lasso and L 0-Segmentation N. A. Johnson 2013 89 10
Algorithms for Fitting the Constrained Lasso Brian R. Gaines and Juhyun Kim and Hua Zhou 2016 81 10
sed.html · lasso.html · v.html

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