✨ code to enter and return from scope
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202
src/runner.js
202
src/runner.js
@ -16,12 +16,10 @@ class Juicescript_runner {
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*/
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run(){
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// RESET //
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// command counter
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this.counter = 0;
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// scope and variable stack
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// stack for command counter, scope and variable list
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this.stack = [{
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scope: null,
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counter: 0,
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variable: {}
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}];
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@ -70,8 +68,7 @@ class Juicescript_runner {
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// TRY AS USER-DEFINED COMMAND //
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if(Object.keys(this.tree.scope).includes(this.command.name)){
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//*/ TODO: enter scope
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/**/this.error("user-defined: " + this.command.name);
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this.scope_enter();
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return;
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}
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@ -95,9 +92,10 @@ class Juicescript_runner {
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// IN USER-DEFINED SCOPE //
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if(this.scope !== null){
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// return from scope
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//*/ TODO: return from scope
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/**/this.error("return from scope");
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return false;
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this.scope_return();
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// check again for new scope
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return this.handle_command_list_end();
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}
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@ -112,12 +110,122 @@ class Juicescript_runner {
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this.command = this.scope_tree.command[this.counter];
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}
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/*
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HELPER: Handle entering another scope by user command
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*/
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scope_enter(){
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// VALIDATE ARGUMENTS //
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// argument count
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this.argument_validate_count(this.tree.scope[this.command.name].parameter_count);
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// they must all be of type 'value'
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for(var q = 1; q <= this.command.argument.length; q++){
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this.argument_validate_type(q, Juicescript.argument_type.VALUE);
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}
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// RESOLVE ARGUMENTS //
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// resolve to value
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let argument_value_list = [];
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for(var q = 1; q <= this.command.argument.length; q++){
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argument_value_list.push(this.argument_value(q));
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}
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// resolve to absolute variable
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let argument_variable_list = [];
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for(var q = 0; q < this.command.argument.length; q++){
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if(this.command.argument[q].type === Juicescript.argument_type.VARIABLE){
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// variable, add absolute variable
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argument_variable_list.push(this.argument_variable(q + 1));
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} else {
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// literal, add null
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argument_variable_list.push(null);
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}
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}
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// PUSH NEW LAYER TO STACK //
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this.stack.push({
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scope: this.command.name,
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counter: 0,
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variable: {},
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argument_variable: argument_variable_list
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});
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// FILL IN PARAMETER VARIABLES //
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for(var q = 0; q < this.scope_tree.parameter.length; q++){
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// get parameter name
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let parameter_name = this.scope_tree.parameter[q].name;
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// get argument value
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let argument_value = argument_value_list[q];
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// store as variable in current scope
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this.variable_set({
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name: parameter_name,
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index: []
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}, argument_value);
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}
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}
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/*
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GETTER: Return name of current scope (top of stack)
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HELPER: Handle returning back to previous scope
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*/
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scope_return(){
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// REMEMBER VALUES TO TAKE OVER //
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let take_over_list = [];
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for(var q = 0; q < this.scope_tree.parameter.length; q++){
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// make sure argument was set when called
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if(q >= this.stack_top.argument_variable.length) continue;
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// make sure parameter is read-write
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if(!this.scope_tree.parameter[q].reference) continue;
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// make sure the argument was a variable
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if(this.stack_top.argument_variable[q] === null) continue;
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// get parameter name
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let parameter_name = this.scope_tree.parameter[q].name;
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// get variable's final value
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let variable_value = this.variable_get({
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name: parameter_name,
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index: []
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});
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// add to list
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take_over_list.push({variable: this.stack_top.argument_variable[q], value: variable_value});
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}
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// POP LAYER FROM STACK //
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this.stack.pop();
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// TAKE OVER READ-WRITE PARAMETERS //
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for(var one_reference of take_over_list){
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// set variable's new value
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this.variable_set(one_reference.variable, one_reference.value);
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}
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}
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/*
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GETTER: Return top/bottom of stack
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*/
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get stack_top(){
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return this.stack[this.stack.length - 1];
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}
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get stack_bottom(){
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return this.stack[0];
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}
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/*
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GETTER: Return name of current scope
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*/
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get scope(){
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return this.stack[this.stack.length - 1].scope;
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return this.stack_top.scope;
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}
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/*
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@ -139,6 +247,16 @@ class Juicescript_runner {
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return this.tree.scope[this.scope];
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}
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/*
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GETTER / SETTER: Return current command counter
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*/
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get counter(){
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return this.stack_top.counter;
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}
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set counter(value){
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this.stack_top.counter = value;
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}
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/*
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COMMAND HELPER: Validate number of command arguments
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*/
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@ -219,9 +337,9 @@ class Juicescript_runner {
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*/
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argument(number){
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// GET WANTED ARGUMENT //
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// make sure this argument number exists
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// fallback for argument not existing
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if(this.command.argument.length < number){
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throw "unable to extract value of argument " + number + ", command " + this.command.name + " (not defined)";
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return {type: Juicescript.argument_type.LITERAL, value: null};
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}
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// get argument object
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@ -318,17 +436,15 @@ class Juicescript_runner {
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*/
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variable_get(variable){
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// FIND VARIABLE IN STACK //
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// check if global
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/**/let is_global = false;
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// get its scope's full variable list
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let variable_list;
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if(this.variable_is_global(variable)){
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variable_list = this.stack_bottom.variable;
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} else {
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variable_list = this.stack_top.variable;
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}
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// get index on stack
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let stack_index = this.stack.length - 1;
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if(is_global) stack_index = 0;
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// get index' full variable list
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let variable_list = this.stack[stack_index].variable;
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// try to load value from stack
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// try to load value from list
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let value = null;
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if(Object.keys(variable_list).includes(variable.name)){
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value = variable_list[variable.name];
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@ -336,7 +452,9 @@ class Juicescript_runner {
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// APPLY INDEXES //
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//*/ TODO: apply indexes
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/**/if(variable.index.length > 0) this.warning("yet to be implemented");
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/**/if(value === undefined) value = null;
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// RETURN VALUE //
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@ -384,20 +502,38 @@ class Juicescript_runner {
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*/
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variable_set(variable, value){
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// FIND VARIABLE IN STACK //
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// check if global
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/**/let is_global = false;
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// get its scope's full variable list
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let variable_list;
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if(this.variable_is_global(variable)){
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variable_list = this.stack_bottom.variable;
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} else {
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variable_list = this.stack_top.variable;
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}
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// get index on stack
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let stack_index = this.stack.length - 1;
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if(is_global) stack_index = 0;
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// get index' full variable list
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let variable_list = this.stack[stack_index].variable;
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// set value on stack
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// set value on list
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//*/ TODO: apply indexes
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variable_list[variable.name] = value;
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}
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/*
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VARIABLE HELPER: Check if variable is global
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*/
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variable_is_global(variable){
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// CHECK IF IN ROOT SCOPE //
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if(this.scope === null){
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// can't be global in here
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return false;
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}
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// CHECK IF IN LIST OF GLOBAL VARIABLE NAMES //
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// get list
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let global_list = this.scope_tree.global;
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// check
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return global_list.includes(variable.name);
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}
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/*
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GETTER: Check if there was a warning/error so far
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*/
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