You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
184 lines
5.8 KiB
184 lines
5.8 KiB
6 years ago
|
<!doctype html>
|
||
|
|
|
||
|
|
<title>CodeMirror: Ruby mode</title>
|
||
|
|
<meta charset="utf-8"/>
|
||
|
|
<link rel=stylesheet href="../../doc/docs.css">
|
||
|
|
|
||
|
|
<link rel="stylesheet" href="../../lib/codemirror.css">
|
||
|
|
<script src="../../lib/codemirror.js"></script>
|
||
|
|
<script src="../../addon/edit/matchbrackets.js"></script>
|
||
|
|
<script src="ruby.js"></script>
|
||
|
|
<style>
|
||
|
|
.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
|
||
|
|
.cm-s-default span.cm-arrow { color: red; }
|
||
|
|
</style>
|
||
|
|
<div id=nav>
|
||
|
|
<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
|
||
|
|
|
||
|
|
<ul>
|
||
|
|
<li><a href="../../index.html">Home</a>
|
||
|
|
<li><a href="../../doc/manual.html">Manual</a>
|
||
|
|
<li><a href="https://github.com/codemirror/codemirror">Code</a>
|
||
|
|
</ul>
|
||
|
|
<ul>
|
||
|
|
<li><a href="../index.html">Language modes</a>
|
||
|
|
<li><a class=active href="#">Ruby</a>
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<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>.</p>
|
||
|
|
|
||
|
|
</article>
|