1 | /* e.g. |
2 | |
3 | overlay <- ScreenOverlay |
4 | bounds <- rightScreenBounds |
5 | overlay bounds bounds |
6 | overlay show |
7 | */ |
8 | |
9 | sclass GazelleV_LeftArrowScriptParser > SimpleLeftToRightParser {
|
10 | new Script script; |
11 | new LinkedHashSet<S> knownVars; |
12 | |
13 | // object can be a class |
14 | srecord MethodOnObject(O object, S method) {}
|
15 | |
16 | interface Evaluable {
|
17 | public O get(VarContext ctx default new); |
18 | } |
19 | |
20 | // We're using SynchronizedList as a list wrapper |
21 | //sclass Script extends ArrayList<Evaluable> {
|
22 | sclass Script extends SynchronizedList<Evaluable> is Evaluable {
|
23 | *() { super(new L); }
|
24 | |
25 | public O get(VarContext ctx) {
|
26 | O result = null; |
27 | for (step : this) |
28 | result = step.get(ctx); |
29 | ret result; |
30 | } |
31 | } |
32 | |
33 | srecord noeq Assignment(S var, Evaluable expression) is Evaluable {
|
34 | public O get(VarContext ctx) {
|
35 | O o = expression.get(ctx); |
36 | ctx.set(var, o); |
37 | ret o; |
38 | } |
39 | } |
40 | |
41 | srecord noeq NewObject(Class c) is Evaluable {
|
42 | public O get(VarContext ctx) {
|
43 | ret callConstructor(c); |
44 | } |
45 | } |
46 | |
47 | srecord noeq GetVar(S var) is Evaluable {
|
48 | public O get(VarContext ctx) {
|
49 | ret ctx.get(var); |
50 | } |
51 | } |
52 | |
53 | srecord noeq Const(O value) is Evaluable {
|
54 | public O get(VarContext ctx) {
|
55 | ret value; |
56 | } |
57 | } |
58 | |
59 | srecord CallMethod(Evaluable target, S methodName, L<Evaluable> args) is Evaluable {
|
60 | public O get(VarContext ctx) {
|
61 | ret call(target.get(ctx), methodName, mapToArray(args, arg -> arg.get(ctx))); |
62 | } |
63 | } |
64 | |
65 | Script parse(S text) {
|
66 | setText(text); |
67 | while (mainLoop()) {
|
68 | S t = token(); |
69 | if (isIdentifier(t) && eq(token(1), "<") && eq(token(2), "-")) {
|
70 | next(3); |
71 | knownVars.add(t); |
72 | script.add(new Assignment(t, parseExpr())); |
73 | } else |
74 | script.add(parseExpr()); |
75 | } |
76 | ret script; |
77 | } |
78 | |
79 | Evaluable parseOptionalExpression() {
|
80 | if (lineBreak()) null; |
81 | ret parseExpr(); |
82 | } |
83 | |
84 | Evaluable parseExpr() {
|
85 | if (atEnd()) null; |
86 | S t = tpp(); |
87 | print(+t); |
88 | |
89 | if (knownVars.contains(t)) |
90 | ret parseCall(new GetVar(t)); |
91 | |
92 | O o = findExternalObject(t); |
93 | if (o == null) |
94 | fail("Unknown object: " + t);
|
95 | else if (o cast Class) |
96 | ret new NewObject(o); |
97 | else if (o cast MethodOnObject) |
98 | ret new CallMethod(new Const(o.object), o.method, parseExpressions()); |
99 | else |
100 | ret parseCall(new Const(o)); |
101 | } |
102 | |
103 | L<Evaluable> parseExpressions() {
|
104 | ret collectWhileNotNull(-> parseOptionalExpression()); |
105 | } |
106 | |
107 | Evaluable parseCall(Evaluable target) {
|
108 | if (atEndOrLineBreak()) ret target; |
109 | |
110 | S methodName = tpp(); |
111 | var args = parseExpressions(); |
112 | ret new CallMethod(target, methodName, args); |
113 | } |
114 | |
115 | // can return MethodOnObject |
116 | swappable O findExternalObject(S name) { null; }
|
117 | } |
Began life as a copy of #1033976
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| Snippet ID: | #1033980 |
| Snippet name: | GazelleV_LeftArrowScriptParser [backup] |
| Eternal ID of this version: | #1033980/1 |
| Text MD5: | d29bd5ca72aa81b2a559af24fa4eb77f |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2022-01-15 05:17:02 |
| Source code size: | 2892 bytes / 117 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 195 / 217 |
| Referenced in: | [show references] |