From 1eba164dd95bcd955475a84ac187269ac2d71e3e Mon Sep 17 00:00:00 2001 From: Jan Nieuwenhuizen Date: Mon, 26 Dec 2016 00:18:22 +0100 Subject: [PATCH] Add pretty-print from Guile. * module/mes/pretty-print.scm: Import. * module/mes/pretty-print.mes: Include it. * AUTHORS: Mention it. --- AUTHORS | 3 + module/mes/pretty-print.mes | 8 +- module/mes/pretty-print.scm | 278 ++++++++++++++++++++++++++++++++++++ 3 files changed, 284 insertions(+), 5 deletions(-) create mode 100644 module/mes/pretty-print.scm diff --git a/AUTHORS b/AUTHORS index f020fe53..2e2dc6d5 100644 --- a/AUTHORS +++ b/AUTHORS @@ -32,6 +32,9 @@ module/mes/peg/ Pmatch from Guile module/mes/pmatch.scm +Pretty-print from Guile +module/mes/pretty-print.scm + Srfi-1 bits from Guile module/srfi/srfi-1.scm diff --git a/module/mes/pretty-print.mes b/module/mes/pretty-print.mes index 5b472575..8869fb96 100644 --- a/module/mes/pretty-print.mes +++ b/module/mes/pretty-print.mes @@ -20,10 +20,8 @@ ;;; Commentary: -;;; base-0.mes is the first file being loaded from the Mes core. It -;;; provides primitives that use Mes internals to create the illusion -;;; of compatibility with Guile. It is not safe to be run by Guile. - ;;; Code: -(define pretty-print display) +(mes-use-module (mes guile)) +(mes-use-module (mes optargs)) +(include-from-path "mes/pretty-print.scm") diff --git a/module/mes/pretty-print.scm b/module/mes/pretty-print.scm new file mode 100644 index 00000000..bef76ddc --- /dev/null +++ b/module/mes/pretty-print.scm @@ -0,0 +1,278 @@ +;;;; -*-scheme-*- +;;;; +;;;; Copyright (C) 2001, 2004, 2006 Free Software Foundation, Inc. +;;;; +;;;; This library is free software; you can redistribute it and/or +;;;; modify it under the terms of the GNU Lesser General Public +;;;; License as published by the Free Software Foundation; either +;;;; version 2.1 of the License, or (at your option) any later version. +;;;; +;;;; This library is distributed in the hope that it will be useful, +;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;;; Lesser General Public License for more details. +;;;; +;;;; You should have received a copy of the GNU Lesser General Public +;;;; License along with this library; if not, write to the Free Software +;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +;;;; +(define-module (ice-9 pretty-print) + :use-module (ice-9 optargs) + :export (pretty-print)) + +;; From SLIB. + +;;"genwrite.scm" generic write used by pretty-print and truncated-print. +;; Copyright (c) 1991, Marc Feeley +;; Author: Marc Feeley (feeley@iro.umontreal.ca) +;; Distribution restrictions: none + +(define genwrite:newline-str (make-string 1 #\newline)) + +(define (generic-write obj display? width per-line-prefix output) + + (define (read-macro? l) + (define (length1? l) (and (pair? l) (null? (cdr l)))) + (let ((head (car l)) (tail (cdr l))) + (case head + ((quote quasiquote unquote unquote-splicing) (length1? tail)) + (else #f)))) + + (define (read-macro-body l) + (cadr l)) + + (define (read-macro-prefix l) + (let ((head (car l))) + (case head + ((quote) "'") + ((quasiquote) "`") + ((unquote) ",") + ((unquote-splicing) ",@")))) + + (define (out str col) + (and col (output str) (+ col (string-length str)))) + + (define (wr obj col) + (cond ((and (pair? obj) + (read-macro? obj)) + (wr (read-macro-body obj) + (out (read-macro-prefix obj) col))) + (else + (out (object->string obj (if display? display write)) col)))) + + (define (pp obj col) + + (define (spaces n col) + (if (> n 0) + (if (> n 7) + (spaces (- n 8) (out " " col)) + (out (substring " " 0 n) col)) + col)) + + (define (indent to col) + (and col + (if (< to col) + (and (out genwrite:newline-str col) + (out per-line-prefix 0) + (spaces to 0)) + (spaces (- to col) col)))) + + (define (pr obj col extra pp-pair) + (if (or (pair? obj) (vector? obj)) ; may have to split on multiple lines + (let ((result '()) + (left (min (+ (- (- width col) extra) 1) max-expr-width))) + (generic-write obj display? #f "" + (lambda (str) + (set! result (cons str result)) + (set! left (- left (string-length str))) + (> left 0))) + (if (> left 0) ; all can be printed on one line + (out (reverse-string-append result) col) + (if (pair? obj) + (pp-pair obj col extra) + (pp-list (vector->list obj) (out "#" col) extra pp-expr)))) + (wr obj col))) + + (define (pp-expr expr col extra) + (if (read-macro? expr) + (pr (read-macro-body expr) + (out (read-macro-prefix expr) col) + extra + pp-expr) + (let ((head (car expr))) + (if (symbol? head) + (let ((proc (style head))) + (if proc + (proc expr col extra) + (if (> (string-length (symbol->string head)) + max-call-head-width) + (pp-general expr col extra #f #f #f pp-expr) + (pp-call expr col extra pp-expr)))) + (pp-list expr col extra pp-expr))))) + + ; (head item1 + ; item2 + ; item3) + (define (pp-call expr col extra pp-item) + (let ((col* (wr (car expr) (out "(" col)))) + (and col + (pp-down (cdr expr) col* (+ col* 1) extra pp-item)))) + + ; (item1 + ; item2 + ; item3) + (define (pp-list l col extra pp-item) + (let ((col (out "(" col))) + (pp-down l col col extra pp-item))) + + (define (pp-down l col1 col2 extra pp-item) + (let loop ((l l) (col col1)) + (and col + (cond ((pair? l) + (let ((rest (cdr l))) + (let ((extra (if (null? rest) (+ extra 1) 0))) + (loop rest + (pr (car l) (indent col2 col) extra pp-item))))) + ((null? l) + (out ")" col)) + (else + (out ")" + (pr l + (indent col2 (out "." (indent col2 col))) + (+ extra 1) + pp-item))))))) + + (define (pp-general expr col extra named? pp-1 pp-2 pp-3) + + (define (tail1 rest col1 col2 col3) + (if (and pp-1 (pair? rest)) + (let* ((val1 (car rest)) + (rest (cdr rest)) + (extra (if (null? rest) (+ extra 1) 0))) + (tail2 rest col1 (pr val1 (indent col3 col2) extra pp-1) col3)) + (tail2 rest col1 col2 col3))) + + (define (tail2 rest col1 col2 col3) + (if (and pp-2 (pair? rest)) + (let* ((val1 (car rest)) + (rest (cdr rest)) + (extra (if (null? rest) (+ extra 1) 0))) + (tail3 rest col1 (pr val1 (indent col3 col2) extra pp-2))) + (tail3 rest col1 col2))) + + (define (tail3 rest col1 col2) + (pp-down rest col2 col1 extra pp-3)) + + (let* ((head (car expr)) + (rest (cdr expr)) + (col* (wr head (out "(" col)))) + (if (and named? (pair? rest)) + (let* ((name (car rest)) + (rest (cdr rest)) + (col** (wr name (out " " col*)))) + (tail1 rest (+ col indent-general) col** (+ col** 1))) + (tail1 rest (+ col indent-general) col* (+ col* 1))))) + + (define (pp-expr-list l col extra) + (pp-list l col extra pp-expr)) + + (define (pp-LAMBDA expr col extra) + (pp-general expr col extra #f pp-expr-list #f pp-expr)) + + (define (pp-IF expr col extra) + (pp-general expr col extra #f pp-expr #f pp-expr)) + + (define (pp-COND expr col extra) + (pp-call expr col extra pp-expr-list)) + + (define (pp-CASE expr col extra) + (pp-general expr col extra #f pp-expr #f pp-expr-list)) + + (define (pp-AND expr col extra) + (pp-call expr col extra pp-expr)) + + (define (pp-LET expr col extra) + (let* ((rest (cdr expr)) + (named? (and (pair? rest) (symbol? (car rest))))) + (pp-general expr col extra named? pp-expr-list #f pp-expr))) + + (define (pp-BEGIN expr col extra) + (pp-general expr col extra #f #f #f pp-expr)) + + (define (pp-DO expr col extra) + (pp-general expr col extra #f pp-expr-list pp-expr-list pp-expr)) + + ; define formatting style (change these to suit your style) + + (define indent-general 2) + + (define max-call-head-width 5) + + (define max-expr-width 50) + + (define (style head) + (case head + ((lambda let* letrec define) pp-LAMBDA) + ((if set!) pp-IF) + ((cond) pp-COND) + ((case) pp-CASE) + ((and or) pp-AND) + ((let) pp-LET) + ((begin) pp-BEGIN) + ((do) pp-DO) + (else #f))) + + (pr obj col 0 pp-expr)) + + (out per-line-prefix 0) + (if width + (out genwrite:newline-str (pp obj 0)) + (wr obj 0)) + ;; Return `unspecified' + (if #f #f)) + +; (reverse-string-append l) = (apply string-append (reverse l)) + +(define (reverse-string-append l) + + (define (rev-string-append l i) + (if (pair? l) + (let* ((str (car l)) + (len (string-length str)) + (result (rev-string-append (cdr l) (+ i len)))) + (let loop ((j 0) (k (- (- (string-length result) i) len))) + (if (< j len) + (begin + (string-set! result k (string-ref str j)) + (loop (+ j 1) (+ k 1))) + result))) + (make-string i))) + + (rev-string-append l 0)) + +(define (pretty-print obj . opts) + "Pretty-print OBJ on PORT, which is a keyword argument defaulting to +the current output port. Formatting can be controlled by a number of +keyword arguments: Each line in the output is preceded by the string +PER-LINE-PREFIX, which is empty by default. The output lines will be +at most WIDTH characters wide; the default is 79. If DISPLAY? is +true, display rather than write representation will be used. + +Instead of with a keyword argument, you can also specify the output +port directly after OBJ, like (pretty-print OBJ PORT)." + (if (pair? opts) + (if (keyword? (car opts)) + (apply pretty-print-with-keys obj opts) + (apply pretty-print-with-keys obj #:port (car opts) (cdr opts))) + (pretty-print-with-keys obj))) + +(define* (pretty-print-with-keys obj + #:key + (port (current-output-port)) + (width 79) + (display? #f) + (per-line-prefix "")) + (generic-write obj display? + (- width (string-length per-line-prefix)) + per-line-prefix + (lambda (s) (display s port) #t)))