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-- Copyright (C) 2012, Gabriel Dos Reis.
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
-- - Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- - Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in
-- the documentation and/or other materials provided with the
-- distribution.
--
-- - Neither the name of OpenAxiom. nor the names of its contributors
-- may be used to endorse or promote products derived from this
-- software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import sys_-constants
namespace BOOT
module io where
blankChar? : %Char -> %Boolean
firstNonblankCharPosition: %String -> %Maybe %Short
trimTrailingBlank: %String -> %String
--%
--% Individual character routines
--%
++ Return true if character `c' is a space character.
macro spaceChar? c ==
c = char " "
++ Return true if character `c' is a horizontal tab character
macro tabChar? c ==
c = abstractChar 9
++ Return true if character `c' is either a space or a horitonal tab.
blankChar? c ==
spaceChar? c or tabChar? c
carriageRetChar? c ==
c = abstractChar 13
--%
--% String manipulation routines.
--%
++ Replace all characters in `s' with space characters.
storeBlank!(s,n) ==
for i in 0..maxIndex s repeat
s.i := char " "
s
++ Return the position of the first nonblank character in line, if any.
firstNonblankCharPosition line ==
or/[i for i in 0..maxIndex line | not blankChar? line.i]
trimTrailingBlank line ==
n := sz := #line
for i in (sz-1)..0 by -1 while blankChar? line.i repeat
n := n - 1
n = sz => line
subString(line,0,n)
trimCarriageReturn line ==
carriageRetChar? line.maxIndex(line) =>
subString(line,0,maxIndex line)
line
expandLeadingTabs line ==
not string? line or #line = 0 => line
line := trimCarriageReturn line
nbLoc := firstNonblankCharPosition line
indLoc := indentationLocation line
nbLoc = indLoc => line
strconc(makeString(indLoc,char " "), subString(line,nbLoc))
++ Find the position at which `s1' matches a substring of `s2',
++ starting from `k'. Return nil on failure.
findString(s1,s2,k == 0) ==
n1 := #s1
or/[i for i in k..(#s2 - n1) |
and/[stringChar(s1,j) = stringChar(s2,i+j) for j in 0..(n1-1)]]
--%
--% Reader
--%
structure %Reader ==
Record(ins: %InputStream, lines: %List %Line) with
readerInput == (.ins)
readerLines == (.lines)
makeReader ist ==
mk%Reader(ist,nil)
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