Sha256: 3c74dd5359cda305033d19069c3e0a5b26a1c670cf76f96471bd3d0aae2a9d7e
Contents?: true
Size: 1.08 KB
Versions: 13
Compression:
Stored size: 1.08 KB
Contents
class StringParser
attr_reader :line, :eos, :i, :len
def initialize(line)
raise NilValue if line.nil?
raise ExpectedString unless String === line
@line = line
@len = @line.length
@eos = @len == 0 ? true : false
@i = 0
end
def grab(n = 1)
raise "n <= 0 for #grab" if n <= 0
return nil if @eos
i2 = @i + n - 1
char = @line[@i..i2]
@i += n
check_eos
char
end
def ungrab
@i -= 1
check_eos
end
def lookahead
# Get rid of this?
@line[@i + 1]
end
def remainder
@line[@i..-1]
end
def prev
return nil if @i <= 0
@line[@i-1]
end
def eos?
@eos
end
def peek(n = 1)
raise "n <= 0 for #grab" if n <= 0
return nil if @eos
i2 = @i + n - 1
@line[@i..i2]
end
def skip_spaces
char = nil
loop do
char = peek
break if eos?
break if char != " "
char = grab
end
char
end
private
def check_eos
@eos = @i >= @len
end
end
=begin
skip
lookahead skip! peek!(?)
expect_alpha
expect_number
skip_spaces
expect_eos
=end
Version data entries
13 entries across 13 versions & 1 rubygems