HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 1b101522 LC |
1 | ;;; test-lr-associativity-01.scm -- |
| 2 | ;; | |
| 3 | ;;Show how to use left and right associativity. Notice that the | |
| 4 | ;;terminal M is declared as non-associative; this influences the binding | |
| 5 | ;;of values to the $n symbols in the semantic clauses. The semantic | |
| 6 | ;;clause in the rule: | |
| 7 | ;; | |
| 8 | ;; (E M E M E) : (list $1 $2 (list $3 $4 $5)) | |
| 9 | ;; | |
| 10 | ;;looks like it is right-associated, and it is because we have declared | |
| 11 | ;;M as "right:". | |
| 12 | ;; | |
| 13 | ||
| 14 | (load "common-test.scm") | |
| 15 | ||
| 16 | (define (doit . tokens) | |
| 17 | (let ((parser (lalr-parser | |
| 18 | (expect: 0) | |
| 19 | (N (nonassoc: A) | |
| 20 | (nonassoc: M)) | |
| 21 | (E (N) : $1 | |
| 22 | (E A E) : (list $1 $2 $3) | |
| 23 | (E A E A E) : (list (list $1 $2 $3) $4 $5) | |
| 24 | (E M E) : (list $1 $2 $3) | |
| 25 | (E M E M E) : (list $1 $2 (list $3 $4 $5)))))) | |
| 26 | (parser (make-lexer tokens) error-handler))) | |
| 27 | ||
| 28 | ;;; -------------------------------------------------------------------- | |
| 29 | ;;; Single operator. | |
| 30 | ||
| 31 | (check | |
| 32 | (doit (make-lexical-token 'N #f 1)) | |
| 33 | => 1) | |
| 34 | ||
| 35 | (check | |
| 36 | (doit (make-lexical-token 'N #f 1) | |
| 37 | (make-lexical-token 'A #f '+) | |
| 38 | (make-lexical-token 'N #f 2)) | |
| 39 | => '(1 + 2)) | |
| 40 | ||
| 41 | (check | |
| 42 | (doit (make-lexical-token 'N #f 1) | |
| 43 | (make-lexical-token 'M #f '*) | |
| 44 | (make-lexical-token 'N #f 2)) | |
| 45 | => '(1 * 2)) | |
| 46 | ||
| 47 | ;;; -------------------------------------------------------------------- | |
| 48 | ;;; Precedence. | |
| 49 | ||
| 50 | (check | |
| 51 | (doit (make-lexical-token 'N #f 1) | |
| 52 | (make-lexical-token 'A #f '+) | |
| 53 | (make-lexical-token 'N #f 2) | |
| 54 | (make-lexical-token 'M #f '*) | |
| 55 | (make-lexical-token 'N #f 3)) | |
| 56 | => '(1 + (2 * 3))) | |
| 57 | ||
| 58 | (check | |
| 59 | (doit (make-lexical-token 'N #f 1) | |
| 60 | (make-lexical-token 'M #f '*) | |
| 61 | (make-lexical-token 'N #f 2) | |
| 62 | (make-lexical-token 'A #f '+) | |
| 63 | (make-lexical-token 'N #f 3)) | |
| 64 | => '((1 * 2) + 3)) | |
| 65 | ||
| 66 | ;;; -------------------------------------------------------------------- | |
| 67 | ;;; Associativity. | |
| 68 | ||
| 69 | (check | |
| 70 | (doit (make-lexical-token 'N #f 1) | |
| 71 | (make-lexical-token 'A #f '+) | |
| 72 | (make-lexical-token 'N #f 2) | |
| 73 | (make-lexical-token 'A #f '+) | |
| 74 | (make-lexical-token 'N #f 3)) | |
| 75 | => '((1 + 2) + 3)) | |
| 76 | ||
| 77 | (check | |
| 78 | (doit (make-lexical-token 'N #f 1) | |
| 79 | (make-lexical-token 'M #f '*) | |
| 80 | (make-lexical-token 'N #f 2) | |
| 81 | (make-lexical-token 'M #f '*) | |
| 82 | (make-lexical-token 'N #f 3)) | |
| 83 | => '(1 * (2 * 3))) | |
| 84 | ||
| 85 | ;;; end of file |