Class: StringScanner

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# File 'opal/stdlib/strscan.rb', line 4
def initialize(string)
 @string = string
 @pos = 0
 @matched = nil
 @working = string
 @match = []
end

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# File 'opal/stdlib/strscan.rb', line 2
def matched
 @matched
end

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# File 'opal/stdlib/strscan.rb', line 2
def pos
 @pos
end

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# File 'opal/stdlib/strscan.rb', line 12
def string
 @string
end

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# File 'opal/stdlib/strscan.rb', line 62
def [](idx)
 if @match.empty?
 return nil
 end
 case idx
 when Symbol
 idx = idx.to_s
 when String 
 # noop
 else
 idx = ::Opal.coerce_to!(idx, Integer , :to_int)
 end
 %x{
 var match = #{@match};
 if (idx < 0) {
 idx += match.length;
 }
 if (idx < 0 || idx >= match.length) {
 return nil;
 }
 if (match[idx] == null) {
 return nil;
 }
 return match[idx];
 }
end

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# File 'opal/stdlib/strscan.rb', line 14
def beginning_of_line?
 `#{@pos} === 0 || #{@string}.charAt(#{@pos} - 1) === "\n"`
end

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# File 'opal/stdlib/strscan.rb', line 93
def check(pattern)
 pattern = anchor(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 return #{@matched} = nil;
 }
 return #{@matched} = result[0];
 }
end

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# File 'opal/stdlib/strscan.rb', line 107
def check_until(pattern)
 %x{
 var old_prev_pos = #{@prev_pos};
 var old_pos = #{@pos};
 var old_working = #{@working};
 var result = #{scan_until(pattern)};
 #{@prev_pos} = old_prev_pos;
 #{@pos} = old_pos;
 #{@working} = old_working;
 return result;
 }
end

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# File 'opal/stdlib/strscan.rb', line 127
def eos?
 `#{@working}.length === 0`
end

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# File 'opal/stdlib/strscan.rb', line 131
def exist?(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 return nil;
 }
 else if (result.index == 0) {
 return 0;
 }
 else {
 return result.index + 1;
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 187
def get_byte
 %x{
 var result = nil;
 if (#{@pos} < #{@string}.length) {
 #{@prev_pos} = #{@pos};
 #{@pos} += 1;
 result = #{@matched} = #{@working}.substring(0, 1);
 #{@working} = #{@working}.substring(1);
 }
 else {
 #{@matched} = nil;
 }
 return result;
 }
end

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# File 'opal/stdlib/strscan.rb', line 205
def match?(pattern)
 pattern = anchor(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 return nil;
 }
 else {
 #{@prev_pos} = #{@pos};
 return result[0].length;
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 233
def matched_size
 %x{
 if (#{@matched} === nil) {
 return nil;
 }
 return #{@matched}.length
 }
end

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# File 'opal/stdlib/strscan.rb', line 123
def peek(length)
 `#{@working}.substring(0, length)`
end

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# File 'opal/stdlib/strscan.rb', line 243
def post_match
 %x{
 if (#{@matched} === nil) {
 return nil;
 }
 return #{@string}.substr(#{@pos});
 }
end

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# File 'opal/stdlib/strscan.rb', line 253
def pre_match
 %x{
 if (#{@matched} === nil) {
 return nil;
 }
 return #{@string}.substr(0, #{@prev_pos});
 }
end

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# File 'opal/stdlib/strscan.rb', line 263
def reset
 @working = @string
 @matched = nil
 @pos = 0
end

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# File 'opal/stdlib/strscan.rb', line 269
def rest
 @working
end

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# File 'opal/stdlib/strscan.rb', line 273
def rest?
 `#{@working}.length !== 0`
end

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# File 'opal/stdlib/strscan.rb', line 277
def rest_size
 rest.size
end

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# File 'opal/stdlib/strscan.rb', line 18
def scan(pattern)
 pattern = anchor(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 return #{@matched} = nil;
 }
 #{@prev_pos} = #{@pos};
 #{@pos} += result[0].length;
 #{@working} = #{@working}.substring(result[0].length);
 #{@matched} = result[0];
 #{@match} = result;
 return result[0];
 }
end

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# File 'opal/stdlib/strscan.rb', line 37
def scan_until(pattern)
 pattern = anchor(pattern)
 %x{
 var working = #{@working}
 for(var i = 0; working.length != i; ++i) {
 var result = pattern.exec(working.substr(i));
 if (result !== null) {
 var matched_size = i + result[0].length
 var matched = working.substr(0, matched_size)
 #{@matched} = result[0]
 #{@match} = result
 #{@prev_pos} = #{@pos} + i; // Position of first character of matched
 #{@pos} += matched_size // Position one after last character of matched
 #{@working} = working.substr(matched_size)
 return matched
 }
 }
 return #{@matched} = nil;
 }
end

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# File 'opal/stdlib/strscan.rb', line 147
def skip(pattern)
 pattern = anchor(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 #{@match} = [];
 return #{@matched} = nil;
 }
 else {
 var match_str = result[0];
 var match_len = match_str.length;
 #{@matched} = match_str;
 #{@match} = result;
 #{@prev_pos} = #{@pos};
 #{@pos} += match_len;
 #{@working} = #{@working}.substring(match_len);
 return match_len;
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 172
def skip_until(pattern)
 %x{
 var result = #{scan_until(pattern)};
 if (result === nil) {
 return nil;
 }
 else {
 #{@matched} = result.substr(-1);
 return result.length;
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 281
def terminate
 @match = nil
 self.pos = @string.length
end

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# File 'opal/stdlib/strscan.rb', line 286
def unscan
 @pos = @prev_pos
 @prev_pos = nil
 @match = nil
 self
end