Coroutines (include) [1004241]

!include #1007935 // isTrue for coroutines

static O evalAll(L l) {
  O result = null;
  for (O o : unnull(l))
    result = eval(o);
  ret result;
}

static O eval(O o) {
  // for more convenient code making (string literals)
  if (o instanceof S)
    ret (S) o;
  ret callOpt(o);
}

static int stepAll_steps;
static bool stepAll_verbose;

// step until state = null
static O stepAll(O o) {
  O result = null;
  while (o != null) {
    ++stepAll_steps;
    if (stepAll_verbose)
      print("step " + stepAll_steps + ": " + structure(o));
    Pair p = cast call(o, "step");
    result = p.a;
    o = p.b;
  }
  ret result;
}

static Pair doStep(O o) {
  if (stepAll_verbose)
    print("doStep " + structure(o));

  if (o == null) ret pair(null, null);
  
  if (hasMethod(o, "step"))
    ret (Pair) call(o, "step");
    
  // it's something simple, let's just eval
  ret pair(eval(o), null);
}

sclass Block {
  L statements;
  
  *() {}
  *(L *statements) {}
  
  O get() {
    ret evalAll(statements);
  }
  
  class Step {
    int i;
    Block block = Block.this; // for structure()

    *() {}
    *(int *i) {}
    
    Pair step() {
      Pair p = doStep(statements.get(i));
      O nextStep = i+1 < l(statements) ? new Step(i+1) : null;
      ret pair(p.a, _block(p.b, nextStep));
    }
  }
  
  // result + new state
  Pair step() {
    ret isEmpty(statements) ? new Pair(null, null) : new Step().step();
  }
}

static O _block(O... statements) {
  L l = withoutNulls(newList(statements));
  if (isEmpty(l)) null;
  if (l(l) == 1) ret first(l);
  ret new Block(l);
}

sclass ResultFinder {
  O exp;
  Var dest;
  
  *() {}
  *(O *exp, Var *dest) {}
  
  O step() {
    Pair p = doStep(exp);
    if (p.b == null) {
      dest.set(p.a);
      ret p;
    } else
      // keep evaluating until done
      ret pair(null, _block(p.b, this));
  }
}

sclass If {
  O a, b, c; // condition, then, else
  
  *() {}
  *(O *a, O *b) {}
  *(O *a, O *b, O *c) {}
  
  O get() {
    ret eval(isTrue(a) ? b : c);
  }
  
  // rewrite so it's steppable
  Pair step() {
    final new Var result;
    ret doStep(_block(
      new ResultFinder(a, result),
      new O {
        O step() {
          ret doStep(booleanValue(result.get()) ? b : c);
        }
      }));
  }
}

static O _if(O a, O b) {
  ret new If(a, b);
}

static O _if(O a, O b, O c) {
  ret new If(a, b, c);
}

sclass While {
  O condition, code;
  
  *() {}
  *(O *condition, O *code) {}
  
  void get() {
    while (isTrue(condition))
      eval(code);
  }
  
  // rewrite so it's steppable
  Pair step() {
    ret doStep(_if(condition, _block(code, this)));
  }
}

static O _while(O a, O code) {
  ret new While(a, code);
}

static O _for(O a, O b, O c, O code) {
  ret _block(a, _while(b, _block(code, c)));
}

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1	!include #1007935 // isTrue for coroutines
2
3	static O evalAll(L l) {
4	O result = null;
5	for (O o : unnull(l))
6	result = eval(o);
7	ret result;
8	}
9
10	static O eval(O o) {
11	// for more convenient code making (string literals)
12	if (o instanceof S)
13	ret (S) o;
14	ret callOpt(o);
15	}
16
17	static int stepAll_steps;
18	static bool stepAll_verbose;
19
20	// step until state = null
21	static O stepAll(O o) {
22	O result = null;
23	while (o != null) {
24	++stepAll_steps;
25	if (stepAll_verbose)
26	print("step " + stepAll_steps + ": " + structure(o));
27	Pair p = cast call(o, "step");
28	result = p.a;
29	o = p.b;
30	}
31	ret result;
32	}
33
34	static Pair doStep(O o) {
35	if (stepAll_verbose)
36	print("doStep " + structure(o));
37
38	if (o == null) ret pair(null, null);
39
40	if (hasMethod(o, "step"))
41	ret (Pair) call(o, "step");
42
43	// it's something simple, let's just eval
44	ret pair(eval(o), null);
45	}
46
47	sclass Block {
48	L statements;
49
50	*() {}
51	(L statements) {}
52
53	O get() {
54	ret evalAll(statements);
55	}
56
57	class Step {
58	int i;
59	Block block = Block.this; // for structure()
60
61	*() {}
62	(int i) {}
63
64	Pair step() {
65	Pair p = doStep(statements.get(i));
66	O nextStep = i+1 < l(statements) ? new Step(i+1) : null;
67	ret pair(p.a, _block(p.b, nextStep));
68	}
69	}
70
71	// result + new state
72	Pair step() {
73	ret isEmpty(statements) ? new Pair(null, null) : new Step().step();
74	}
75	}
76
77	static O _block(O... statements) {
78	L l = withoutNulls(newList(statements));
79	if (isEmpty(l)) null;
80	if (l(l) == 1) ret first(l);
81	ret new Block(l);
82	}
83
84	sclass ResultFinder {
85	O exp;
86	Var dest;
87
88	*() {}
89	(O exp, Var *dest) {}
90
91	O step() {
92	Pair p = doStep(exp);
93	if (p.b == null) {
94	dest.set(p.a);
95	ret p;
96	} else
97	// keep evaluating until done
98	ret pair(null, _block(p.b, this));
99	}
100	}
101
102	sclass If {
103	O a, b, c; // condition, then, else
104
105	*() {}
106	(O a, O *b) {}
107	(O a, O b, O c) {}
108
109	O get() {
110	ret eval(isTrue(a) ? b : c);
111	}
112
113	// rewrite so it's steppable
114	Pair step() {
115	final new Var result;
116	ret doStep(_block(
117	new ResultFinder(a, result),
118	new O {
119	O step() {
120	ret doStep(booleanValue(result.get()) ? b : c);
121	}
122	}));
123	}
124	}
125
126	static O _if(O a, O b) {
127	ret new If(a, b);
128	}
129
130	static O _if(O a, O b, O c) {
131	ret new If(a, b, c);
132	}
133
134	sclass While {
135	O condition, code;
136
137	*() {}
138	(O condition, O *code) {}
139
140	void get() {
141	while (isTrue(condition))
142	eval(code);
143	}
144
145	// rewrite so it's steppable
146	Pair step() {
147	ret doStep(_if(condition, _block(code, this)));
148	}
149	}
150
151	static O _while(O a, O code) {
152	ret new While(a, code);
153	}
154
155	static O _for(O a, O b, O c, O code) {
156	ret _block(a, _while(b, _block(code, c)));
157	}

Snippet ID:	#1004241
Snippet name:	Coroutines (include)
Eternal ID of this version:	#1004241/4
Text MD5:	c75282bc93c9f0d94a58f2a85ab77422
Author:	stefan
Category:	javax / coroutines
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2017-10-06 17:49:46
Source code size:	2923 bytes / 157 lines
Pitched / IR pitched:	No / No
Views / Downloads:	679 / 1076
Version history:	3 change(s)
Referenced in:	[show references]

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JavaX fragment (include)