Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 1 | package main |
| 2 | |
Fumitoshi Ukai | e1b813c | 2015-03-30 18:38:21 +0900 | [diff] [blame] | 3 | import "fmt" |
| 4 | |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 5 | type AST interface { |
Fumitoshi Ukai | e34c179 | 2015-03-30 17:53:47 +0900 | [diff] [blame] | 6 | eval(*Evaluator) |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 7 | show() |
| 8 | } |
| 9 | |
| 10 | type ASTBase struct { |
Shinichiro Hamaji | 685fecf | 2015-03-30 18:28:12 +0900 | [diff] [blame] | 11 | filename string |
| 12 | lineno int |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 13 | } |
| 14 | |
| 15 | type AssignAST struct { |
| 16 | ASTBase |
Fumitoshi Ukai | e1b813c | 2015-03-30 18:38:21 +0900 | [diff] [blame] | 17 | lhs string |
| 18 | rhs string |
| 19 | op string |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 20 | } |
| 21 | |
Fumitoshi Ukai | e34c179 | 2015-03-30 17:53:47 +0900 | [diff] [blame] | 22 | func (ast *AssignAST) eval(ev *Evaluator) { |
| 23 | ev.evalAssign(ast) |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 24 | } |
| 25 | |
Shinichiro Hamaji | 69b7f65 | 2015-03-31 01:01:59 +0900 | [diff] [blame] | 26 | func (ast *AssignAST) evalRHS(ev *Evaluator, lhs string) string { |
Fumitoshi Ukai | e1b813c | 2015-03-30 18:38:21 +0900 | [diff] [blame] | 27 | switch ast.op { |
| 28 | case ":=": |
| 29 | return ev.evalExpr(ast.rhs) |
| 30 | case "=": |
| 31 | return ast.rhs |
Shinichiro Hamaji | 69b7f65 | 2015-03-31 01:01:59 +0900 | [diff] [blame] | 32 | case "+=": |
| 33 | prev, _ := ev.getVar(lhs) |
| 34 | return fmt.Sprintf("%s %s", prev, ev.evalExpr(ast.rhs)) |
| 35 | case "?=": |
| 36 | prev, present := ev.getVar(lhs) |
| 37 | if present { |
| 38 | return prev |
| 39 | } |
| 40 | return ev.evalExpr(ast.rhs) |
| 41 | default: |
| 42 | panic(fmt.Sprintf("unknown assign op: %q", ast.op)) |
Fumitoshi Ukai | e1b813c | 2015-03-30 18:38:21 +0900 | [diff] [blame] | 43 | } |
| 44 | } |
| 45 | |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 46 | func (ast *AssignAST) show() { |
| 47 | Log("%s=%s", ast.lhs, ast.rhs) |
| 48 | } |
| 49 | |
| 50 | type RuleAST struct { |
| 51 | ASTBase |
Shinichiro Hamaji | ae32b78 | 2015-03-31 14:41:19 +0900 | [diff] [blame] | 52 | lhs string |
| 53 | rhs string |
| 54 | cmds []string |
Shinichiro Hamaji | 7c4e325 | 2015-03-30 23:04:25 +0900 | [diff] [blame] | 55 | cmdLineno int |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 56 | } |
| 57 | |
Fumitoshi Ukai | e34c179 | 2015-03-30 17:53:47 +0900 | [diff] [blame] | 58 | func (ast *RuleAST) eval(ev *Evaluator) { |
| 59 | ev.evalRule(ast) |
Fumitoshi Ukai | 119dc91 | 2015-03-30 16:52:41 +0900 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | func (ast *RuleAST) show() { |
| 63 | Log("%s: %s", ast.lhs, ast.rhs) |
| 64 | for _, cmd := range ast.cmds { |
| 65 | Log("\t%s", cmd) |
| 66 | } |
| 67 | } |
Shinichiro Hamaji | 685fecf | 2015-03-30 18:28:12 +0900 | [diff] [blame] | 68 | |
| 69 | type RawExprAST struct { |
| 70 | ASTBase |
| 71 | expr string |
| 72 | } |
| 73 | |
| 74 | func (ast *RawExprAST) eval(ev *Evaluator) { |
| 75 | ev.evalRawExpr(ast) |
| 76 | } |
| 77 | |
| 78 | func (ast *RawExprAST) show() { |
| 79 | Log("%s", ast.expr) |
| 80 | } |
Shinichiro Hamaji | d7bef60 | 2015-03-30 19:55:32 +0900 | [diff] [blame] | 81 | |
| 82 | type IncludeAST struct { |
| 83 | ASTBase |
| 84 | expr string |
| 85 | op string |
| 86 | } |
| 87 | |
| 88 | func (ast *IncludeAST) eval(ev *Evaluator) { |
| 89 | ev.evalInclude(ast) |
| 90 | } |
| 91 | |
| 92 | func (ast *IncludeAST) show() { |
| 93 | Log("include %s", ast.expr) |
| 94 | } |
Shinichiro Hamaji | 497754d | 2015-03-31 02:02:11 +0900 | [diff] [blame] | 95 | |
| 96 | type IfAST struct { |
| 97 | ASTBase |
Shinichiro Hamaji | ae32b78 | 2015-03-31 14:41:19 +0900 | [diff] [blame] | 98 | op string |
| 99 | lhs string |
| 100 | rhs string // Empty if |op| is ifdef or ifndef. |
| 101 | trueStmts []AST |
Shinichiro Hamaji | 497754d | 2015-03-31 02:02:11 +0900 | [diff] [blame] | 102 | falseStmts []AST |
| 103 | } |
| 104 | |
| 105 | func (ast *IfAST) eval(ev *Evaluator) { |
| 106 | ev.evalIf(ast) |
| 107 | } |
| 108 | |
| 109 | func (ast *IfAST) show() { |
| 110 | // TODO |
| 111 | Log("if") |
| 112 | } |