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Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
185 lines
5.6 KiB
HTML
185 lines
5.6 KiB
HTML
<!doctype html>
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<title>CodeMirror: Ruby mode</title>
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<meta charset="utf-8"/>
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<script src="../../lib/codemirror.js"></script>
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<script src="../../addon/edit/matchbrackets.js"></script>
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<script src="ruby.js"></script>
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<style>
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.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
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.cm-s-default span.cm-arrow { color: red; }
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</style>
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<div id=nav>
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<a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>
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<ul>
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<li><a href="../../index.html">Home</a>
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<li><a href="../../doc/manual.html">Manual</a>
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<li><a href="https://github.com/marijnh/codemirror">Code</a>
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</ul>
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<ul>
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<li><a href="../index.html">Language modes</a>
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<li><a class=active href="#">Ruby</a>
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</ul>
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</div>
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<article>
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<h2>Ruby mode</h2>
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<form><textarea id="code" name="code">
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# Code from http://sandbox.mc.edu/~bennet/ruby/code/poly_rb.html
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#
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# This program evaluates polynomials. It first asks for the coefficients
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# of a polynomial, which must be entered on one line, highest-order first.
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# It then requests values of x and will compute the value of the poly for
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# each x. It will repeatly ask for x values, unless you the user enters
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# a blank line. It that case, it will ask for another polynomial. If the
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# user types quit for either input, the program immediately exits.
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#
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#
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# Function to evaluate a polynomial at x. The polynomial is given
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# as a list of coefficients, from the greatest to the least.
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def polyval(x, coef)
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sum = 0
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coef = coef.clone # Don't want to destroy the original
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while true
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sum += coef.shift # Add and remove the next coef
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break if coef.empty? # If no more, done entirely.
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sum *= x # This happens the right number of times.
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end
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return sum
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end
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#
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# Function to read a line containing a list of integers and return
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# them as an array of integers. If the string conversion fails, it
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# throws TypeError. If the input line is the word 'quit', then it
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# converts it to an end-of-file exception
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def readints(prompt)
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# Read a line
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print prompt
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line = readline.chomp
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raise EOFError.new if line == 'quit' # You can also use a real EOF.
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# Go through each item on the line, converting each one and adding it
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# to retval.
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retval = [ ]
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for str in line.split(/\s+/)
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if str =~ /^\-?\d+$/
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retval.push(str.to_i)
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else
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raise TypeError.new
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end
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end
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return retval
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end
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#
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# Take a coeff and an exponent and return the string representation, ignoring
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# the sign of the coefficient.
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def term_to_str(coef, exp)
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ret = ""
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# Show coeff, unless it's 1 or at the right
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coef = coef.abs
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ret = coef.to_s unless coef == 1 && exp > 0
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ret += "x" if exp > 0 # x if exponent not 0
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ret += "^" + exp.to_s if exp > 1 # ^exponent, if > 1.
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return ret
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end
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#
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# Create a string of the polynomial in sort-of-readable form.
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def polystr(p)
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# Get the exponent of first coefficient, plus 1.
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exp = p.length
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# Assign exponents to each term, making pairs of coeff and exponent,
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# Then get rid of the zero terms.
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p = (p.map { |c| exp -= 1; [ c, exp ] }).select { |p| p[0] != 0 }
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# If there's nothing left, it's a zero
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return "0" if p.empty?
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# *** Now p is a non-empty list of [ coef, exponent ] pairs. ***
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# Convert the first term, preceded by a "-" if it's negative.
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result = (if p[0][0] < 0 then "-" else "" end) + term_to_str(*p[0])
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# Convert the rest of the terms, in each case adding the appropriate
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# + or - separating them.
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for term in p[1...p.length]
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# Add the separator then the rep. of the term.
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result += (if term[0] < 0 then " - " else " + " end) +
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term_to_str(*term)
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end
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return result
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end
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#
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# Run until some kind of endfile.
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begin
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# Repeat until an exception or quit gets us out.
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while true
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# Read a poly until it works. An EOF will except out of the
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# program.
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print "\n"
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begin
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poly = readints("Enter a polynomial coefficients: ")
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rescue TypeError
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print "Try again.\n"
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retry
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end
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break if poly.empty?
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# Read and evaluate x values until the user types a blank line.
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# Again, an EOF will except out of the pgm.
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while true
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# Request an integer.
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print "Enter x value or blank line: "
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x = readline.chomp
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break if x == ''
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raise EOFError.new if x == 'quit'
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# If it looks bad, let's try again.
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if x !~ /^\-?\d+$/
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print "That doesn't look like an integer. Please try again.\n"
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next
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end
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# Convert to an integer and print the result.
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x = x.to_i
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print "p(x) = ", polystr(poly), "\n"
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print "p(", x, ") = ", polyval(x, poly), "\n"
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end
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end
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rescue EOFError
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print "\n=== EOF ===\n"
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rescue Interrupt, SignalException
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print "\n=== Interrupted ===\n"
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else
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print "--- Bye ---\n"
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end
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</textarea></form>
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<script>
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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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mode: "text/x-ruby",
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matchBrackets: true,
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indentUnit: 4
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});
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</script>
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<p><strong>MIME types defined:</strong> <code>text/x-ruby</code>.</p>
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<p>Development of the CodeMirror Ruby mode was kindly sponsored
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by <a href="http://ubalo.com/">Ubalo</a>, who hold
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the <a href="LICENSE">license</a>.</p>
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</article>
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