1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
#include "eval.h"
#include "ast.h"
#include "file.h"
#include "rule.h"
#include "strutil.h"
#include "value.h"
#include "var.h"
EvalResult::~EvalResult() {
for (Rule* r : rules)
delete r;
for (auto p : rule_vars)
delete p.second;
delete vars;
}
Evaluator::Evaluator(const Vars* vars)
: in_vars_(vars),
vars_(new Vars()),
last_rule_(NULL) {
}
Evaluator::~Evaluator() {
for (Rule* r : rules_) {
delete r;
}
delete vars_;
// for (auto p : rule_vars) {
// delete p.second;
// }
}
void Evaluator::EvalAssign(const AssignAST* ast) {
loc_ = ast->loc();
last_rule_ = NULL;
const char* origin = "file";
StringPiece lhs = Intern(*ast->lhs->Eval(this));
Var* rhs = NULL;
bool needs_assign = true;
switch (ast->op) {
case AssignOp::COLON_EQ:
rhs = new SimpleVar(ast->rhs->Eval(this), origin);
break;
case AssignOp::EQ:
rhs = new RecursiveVar(ast->rhs, origin);
break;
case AssignOp::PLUS_EQ: {
Var* prev = LookupVarInCurrentScope(lhs);
if (!prev->IsDefined()) {
rhs = new RecursiveVar(ast->rhs, origin);
} else {
prev->AppendVar(this, ast->rhs);
rhs = prev;
needs_assign = false;
}
break;
}
case AssignOp::QUESTION_EQ: {
Var* prev = LookupVarInCurrentScope(lhs);
if (!prev->IsDefined()) {
rhs = new RecursiveVar(ast->rhs, origin);
} else {
// TODO
abort();
}
break;
}
}
LOG("Assign: %.*s=%s", SPF(lhs), rhs->DebugString().c_str());
if (needs_assign)
vars_->Assign(lhs, rhs);
}
void Evaluator::EvalRule(const RuleAST* ast) {
loc_ = ast->loc();
last_rule_ = NULL;
shared_ptr<string> expr = ast->expr->Eval(this);
// See semicolon.mk.
if (expr->find_first_not_of(" \t\n;") == string::npos)
return;
Rule* rule = new Rule;
rule->loc = loc_;
rule->Parse(*expr);
LOG("Rule: %s", rule->DebugString().c_str());
rules_.push_back(rule);
last_rule_ = rule;
}
void Evaluator::EvalCommand(const CommandAST* ast) {
loc_ = ast->loc();
if (!last_rule_) {
// TODO:
ERROR("TODO");
}
last_rule_->cmds.push_back(ast->expr);
LOG("Command: %s", ast->expr->DebugString().c_str());
}
Var* Evaluator::LookupVar(StringPiece name) {
// TODO: TSV.
Var* v = vars_->Lookup(name);
if (v->IsDefined())
return v;
return in_vars_->Lookup(name);
}
Var* Evaluator::LookupVarInCurrentScope(StringPiece name) {
// TODO: TSV.
Var* v = vars_->Lookup(name);
if (v->IsDefined())
return v;
return in_vars_->Lookup(name);
}
EvalResult* Evaluator::GetEvalResult() {
EvalResult* er = new EvalResult;
er->rules.swap(rules_);
er->vars = vars_;
vars_ = NULL;
er->rule_vars.swap(rule_vars_);
return er;
}
void Evaluator::Error(const string& msg) {
ERROR("%s:%d: %s", loc_.filename, loc_.lineno, msg.c_str());
}
|
