S2OJ/web/js/codemirror/mode/ruby/index.html
Masco Skray 96d4a3ecf7 style(judger,web): move code out from subfolder "1"
Due to historical reasons, the code is in subfolder "1".
With SVN removal, we place the code back and remove the annoying "1" folder.
2019-06-14 23:34:41 +08:00

185 lines
5.6 KiB
HTML

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