1
2
3 /*
4
5 TODO: runtime needs for the "location" var to mean the current location
6 so that the engine can always display a clickable with the location name
7 as a clickable title in the game display
8
9 ALSO: allow location to be set to something invalid (like NOWHERE) which
10 will not display the location at all
11
12
13 */
14
15
16
17 function rungame(tree, outputarea){
18 var gamevars = [];
19 var upper = false;
20
21 // the first element in the tree will be array of the rest of the tree
22 tree = tree[0];
23
24 outputarea.empty();
25 runfunc('start');
26
27 function runfunc(funcname){
28 thefunc = findfunc(funcname);
29 if(!thefunc){ alert("Sorry, your sorry can't continue because there is no \""+funcname+"\" thing defined."); return; }
30 // console.log("running function "+thefunc[1][1]);
31 expressions(thefunc, 2);
32 }
33
34 function findfunc(funcname){
35 for(s in tree){
36 if(tree[s][1][1] == funcname){
37 return tree[s];
38 }
39 }
40 return null;
41 }
42
43 function expression(expr){
44 switch(expr[0]){
45 case 'assign':
46 // console.log("assigning "+expr[1][1]+" to "+expr[2][1]);
47 gamevars[expr[1][1]] = expr[2][1];
48
49 for(v in gamevars){
50 // console.log(gamevars[v]);
51 }
52
53 break;
54 case 'print': print(expr); break;
55 case 'ifseq': ifsequence(expr); break;
56 case 'runme': runfunc(expr[1][1]); break;
57 case 'decr': gamevars[expr[1][1]]--; break;
58 case 'incr': gamevars[expr[1][1]]++; break;
59 case 'elseseq': break; // do nothing, this will run if needed
60 default: alert("Sorry, '"+expr[0]+"' not (yet) supported!");
61 }
62 }
63
64 function expressions(list, startpos){
65 // run multiple expressions from a list, starting from startpos
66 for(var e=startpos; e<list.length; e++){
67 expression(list[e]);
68 }
69 }
70
71 function ifsequence(tree){
72 var val1 = tree[1][1];
73 var test_opr = tree[2][1];
74 var val2 = tree[3][1];
75
76 // console.log("Test: "+val1+" "+test_opr+" "+val2);
77
78 if(tree[1][0] == "name"){ val1=gamevars[val1]; }
79 if(tree[3][0] == "name"){ val2=gamevars[val2]; }
80
81 // console.log("translates to: "+val1+" "+test_opr+" "+val2);
82
83
84 if( (test_opr == "equals" && val1 == val2) ||
85 (test_opr == "less than" && val1 < val2) ||
86 (test_opr == "greater than" && val1 > val2) ||
87 (test_opr == "doesn't equal" && val1 != val2) ){
88 // console.log("true");
89 expressions(tree,4);
90 }
91 else{
92 // console.log("false");
93 // see if there's an else to run
94 for(e in tree){
95 if(tree[e][0] == "elseseq"){
96 expressions(tree[e],1);
97 }
98 }
99 }
100 }
101
102 function print(printables){
103 for(var p = 1; p<printables.length; p++){
104 type = printables[p][0]; // the type of printable item
105 body = printables[p][1]; // the body of the printable
106 // console.log("printing "+type+": "+body);
107 switch(type){
108 case 'string' : printstr(body); break;
109 case 'strname' : printname(body); break;
110 case 'upname' : upper = true; printname(body); break;
111 case 'link' : printlink(body); break;
112 case 'break' : printbreak(); break;
113 default: alert("Sorry, printing '"+type+"' not (yet) supported.");
114 }
115 }
116 }
117
118 function printname(name){
119 if(name in gamevars){
120 printstr(gamevars[name]);
121 return;
122 }
123 if(findfunc(name)){
124 runfunc(name);
125 return;
126 }
127 alert("Sorry, couldn't find anything called '"+name+"' to display.");
128 }
129
130 function printstr(str){
131 str = String(str);
132 if(upper){
133 upper = false; // we've done it, don't do it again until requested
134 printstr(str.charAt(0).toUpperCase()+str.slice(1));
135 return;
136 }
137 outputarea.append("<span>"+str+"</span>");
138 }
139
140 function printlink(funcname){
141 outputarea.append($("<a href=\"#\">"+body+"</a>").click(function(){
142 outputarea.empty();
143 runfunc(funcname);
144 return false;
145 }));
146 }
147
148 function printbreak(){
149 outputarea.append("<hr>");
150 }
151 }
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