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| author | Ludovic Courtes | 2006-12-02 10:43:59 +0000 |
|---|---|---|
| committer | Ludovic Courtes | 2006-12-02 10:43:59 +0000 |
| commit | a7a4342d6efd74f7231994b4cc5b4255b36e13f4 (patch) | |
| tree | 2167b61ded7fdbebe613c232d902203943871258 /src/guile | |
| parent | 32136d000be5c570133c48c3650d5d7b51efa2fc (diff) | |
| download | skribilo-a7a4342d6efd74f7231994b4cc5b4255b36e13f4.tar.gz skribilo-a7a4342d6efd74f7231994b4cc5b4255b36e13f4.tar.lz skribilo-a7a4342d6efd74f7231994b4cc5b4255b36e13f4.zip | |
eq: Properly handle operator precedence.
* src/guile/skribilo/package/eq.scm (%operator-precedence): Fixed
according to Wikipedia.
(simple-markup-writer): Honor operator precedence.
* src/guile/skribilo/package/eq/lout.scm (simple-lout-markup-writer):
Likewise.
git-archimport-id: skribilo@sv.gnu.org--2006/skribilo--devo--1.2--patch-25
Diffstat (limited to 'src/guile')
| -rw-r--r-- | src/guile/skribilo/package/eq.scm | 39 | ||||
| -rw-r--r-- | src/guile/skribilo/package/eq/lout.scm | 28 |
2 files changed, 38 insertions, 29 deletions
diff --git a/src/guile/skribilo/package/eq.scm b/src/guile/skribilo/package/eq.scm index c45f698..a3eb99c 100644 --- a/src/guile/skribilo/package/eq.scm +++ b/src/guile/skribilo/package/eq.scm @@ -116,18 +116,27 @@ a symbol representing the mathematical operator denoted by @var{m} (e.g., ;;; (define %operator-precedence - ;; FIXME: This needs to be augmented. - '((+ . 1) - (- . 1) - (* . 2) - (/ . 2) - (sum . 3) + ;; Taken from http://en.wikipedia.org/wiki/Order_of_operations . + '((expt . 2) + (sqrt . 2) + + (* . 3) + (/ . 3) (product . 3) - (= . 0) - (< . 0) - (> . 0) - (<= . 0) - (>= . 0))) + + (+ . 4) + (- . 4) + (sum . 4) + + (< . 6) + (> . 6) + (<= . 6) + (>= . 6) + + (= . 7) + (!= . 7) + (~= . 7))) + (define-public (operator-precedence op) (let ((p (assq op %operator-precedence))) @@ -329,10 +338,10 @@ a symbol representing the mathematical operator denoted by @var{m} (e.g., (nested-eq? (equation-markup? o)) (need-paren? (and nested-eq? -; (< (operator-precedence -; (equation-markup-name->operator -; (markup-markup o))) -; ,precedence) + (>= (operator-precedence + (equation-markup-name->operator + (markup-markup o))) + ,precedence) ) )) diff --git a/src/guile/skribilo/package/eq/lout.scm b/src/guile/skribilo/package/eq/lout.scm index 563fdbf..9cd594b 100644 --- a/src/guile/skribilo/package/eq/lout.scm +++ b/src/guile/skribilo/package/eq/lout.scm @@ -85,8 +85,12 @@ ;; Note: We could use `pmatrix' here but it precludes line-breaking ;; within equations. - (open-par `(if need-paren? "{ @VScale ( }" "")) - (close-par `(if need-paren? "{ @VScale ) }" ""))) + (open-par (if parentheses? + `(if need-paren? "{ @VScale ( }" "") + "")) + (close-par (if parentheses? + `(if need-paren? "{ @VScale ) }" "") + ""))) `(markup-writer ',(symbol-append 'eq: sym) (find-engine 'lout) @@ -102,25 +106,21 @@ (eq-op? (equation-markup? op)) (need-paren? (and eq-op? - (< (operator-precedence - (equation-markup-name->operator - (markup-markup op))) - ,precedence))) + (>= (operator-precedence + (equation-markup-name->operator + (markup-markup op))) + ,precedence))) (column (port-column (current-output-port)))) ;; Work around Lout's limitations... (if (> column 1000) (display "\n")) - (display (string-append " { " - ,(if parentheses? - open-par - ""))) + (display + (string-append " { " ,open-par)) (output op engine) - (display (string-append ,(if parentheses? - close-par - "") - " }")) + (display + (string-append ,close-par " }")) (if (pair? (cdr operands)) (display (string-append " " lout-name |