Class: StringScanner

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# File 'opal/stdlib/strscan.rb', line 5
def initialize(string)
 @string = string
 @pos = 0
 @matched = nil
 @working = string
 @match = []
end

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# File 'opal/stdlib/strscan.rb', line 3
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 13
def string
 @string
end

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# File 'opal/stdlib/strscan.rb', line 84
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 15
def beginning_of_line?
 `#{@pos} === 0 || #{@string}.charAt(#{@pos} - 1) === "\n"`
end

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# File 'opal/stdlib/strscan.rb', line 115
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 129
def check_until(pattern)
 %x{
 var prev_pos = #{@prev_pos},
 pos = #{@pos};
 var result = #{scan_until(pattern)};
 if (result !== nil) {
 #{@matched} = result.substr(-1);
 #{@working} = #{@string}.substr(pos);
 }
 #{@prev_pos} = prev_pos;
 #{@pos} = pos;
 return result;
 }
end

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# File 'opal/stdlib/strscan.rb', line 152
def eos?
 `#{@working}.length === 0`
end

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# File 'opal/stdlib/strscan.rb', line 156
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 212
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 233
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 261
def matched_size
 %x{
 if (#{@matched} === nil) {
 return nil;
 }
 return #{@matched}.length
 }
end

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# File 'opal/stdlib/strscan.rb', line 148
def peek(length)
 `#{@working}.substring(0, length)`
end

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# File 'opal/stdlib/strscan.rb', line 271
def post_match
 %x{
 if (#{@matched} === nil) {
 return nil;
 }
 return #{@string}.substr(#{@pos});
 }
end

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# File 'opal/stdlib/strscan.rb', line 281
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 291
def reset
 @working = @string
 @matched = nil
 @pos = 0
end

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# File 'opal/stdlib/strscan.rb', line 297
def rest
 @working
end

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# File 'opal/stdlib/strscan.rb', line 301
def rest?
 `#{@working}.length !== 0`
end

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# File 'opal/stdlib/strscan.rb', line 305
def rest_size
 rest.size
end

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# File 'opal/stdlib/strscan.rb', line 21
def scan(pattern)
 pattern = anchor(pattern)
 %x{
 var result = pattern.exec(#{@working});
 if (result == null) {
 return #{@matched} = nil;
 }
 else if (typeof(result) === 'object') {
 #{@prev_pos} = #{@pos};
 #{@pos} += result[0].length;
 #{@working} = #{@working}.substring(result[0].length);
 #{@matched} = result[0];
 #{@match} = result;
 return result[0];
 }
 else if (typeof(result) === 'string') {
 #{@pos} += result.length;
 #{@working} = #{@working}.substring(result.length);
 return result;
 }
 else {
 return nil;
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 51
def scan_until(pattern)
 pattern = anchor(pattern)
 %x{
 var pos = #{@pos},
 working = #{@working},
 result;
 while (true) {
 result = pattern.exec(working);
 pos += 1;
 working = working.substr(1);
 if (result == null) {
 if (working.length === 0) {
 #{@match} = [];
 return #{@matched} = nil;
 }
 continue;
 }
 #{@matched} = #{@string}.substr(#{@pos}, pos - #{@pos} - 1 + result[0].length);
 #{@match} = result;
 #{@prev_pos} = pos - 1;
 #{@pos} = pos;
 #{@working} = working.substr(result[0].length);
 return #{@matched};
 }
 }
end

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# File 'opal/stdlib/strscan.rb', line 172
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 197
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 309
def terminate
 @match = nil
 self.pos = @string.length
end

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# File 'opal/stdlib/strscan.rb', line 314
def unscan
 @pos = @prev_pos
 @prev_pos = nil
 @match = nil
 self
end