Merge pull request #147 from rubychan/go-scannerv1.1.0.rc2

Go scanner

1 files changed, 209 insertions, 0 deletions

diff --git a/lib/coderay/scanners/go.rb b/lib/coderay/scanners/go.rb
new file mode 100644
index 0000000..59473f6
--- /dev/null
+++ b/lib/coderay/scanners/go.rb
@@ -0,0 +1,209 @@
+module CodeRay
+module Scanners
+  
+  # Scanner for Go, copy from c
+  class Go < Scanner
+    
+    register_for :go
+    file_extension 'go'
+    
+    # http://golang.org/ref/spec#Keywords
+    KEYWORDS = [
+      'break', 'default', 'func', 'interface', 'select',
+      'case', 'defer', 'go', 'map', 'struct',
+      'chan', 'else', 'goto', 'package', 'switch',
+      'const', 'fallthrough', 'if', 'range', 'type',
+      'continue', 'for', 'import', 'return', 'var',
+    ]  # :nodoc:
+    
+    # http://golang.org/ref/spec#Types
+    PREDEFINED_TYPES = [
+      'bool',
+      'uint8', 'uint16', 'uint32', 'uint64',
+      'int8', 'int16', 'int32', 'int64',
+      'float32', 'float64',
+      'complex64', 'complex128',
+      'byte', 'rune', 'string', 'error',
+      'uint', 'int', 'uintptr',
+    ]  # :nodoc:
+    
+    PREDEFINED_CONSTANTS = [
+      'nil', 'iota',
+      'true', 'false',
+    ]  # :nodoc:
+    
+    PREDEFINED_FUNCTIONS = %w[
+      append cap close complex copy delete imag len
+      make new panic print println real recover
+    ] # :nodoc:
+    
+    IDENT_KIND = WordList.new(:ident).
+      add(KEYWORDS, :keyword).
+      add(PREDEFINED_TYPES, :predefined_type).
+      add(PREDEFINED_CONSTANTS, :predefined_constant).
+      add(PREDEFINED_FUNCTIONS, :predefined)  # :nodoc:
+    
+    ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x  # :nodoc:
+    UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x  # :nodoc:
+    
+    protected
+    
+    def scan_tokens encoder, options
+      
+      state = :initial
+      label_expected = true
+      case_expected = false
+      label_expected_before_preproc_line = nil
+      in_preproc_line = false
+      
+      until eos?
+        
+        case state
+        
+        when :initial
+          
+          if match = scan(/ \s+ | \\\n /x)
+            if in_preproc_line && match != "\\\n" && match.index(?\n)
+              in_preproc_line = false
+              case_expected = false
+              label_expected = label_expected_before_preproc_line
+            end
+            encoder.text_token match, :space
+          
+          elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
+            encoder.text_token match, :comment
+          
+          elsif match = scan(/ <?- (?![\d.]) | [+*=<>?:;,!&^|()\[\]{}~%]+ | \/=? | \.(?!\d) /x)
+            if case_expected
+              label_expected = true if match == ':'
+              case_expected = false
+            end
+            encoder.text_token match, :operator
+          
+          elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
+            kind = IDENT_KIND[match]
+            if kind == :ident && label_expected && !in_preproc_line && scan(/:(?!:)/)
+              kind = :label
+              label_expected = false
+              match << matched
+            else
+              label_expected = false
+              if kind == :keyword
+                case match
+                when 'case', 'default'
+                  case_expected = true
+                end
+              end
+            end
+            encoder.text_token match, kind
+          
+          elsif match = scan(/L?"/)
+            encoder.begin_group :string
+            if match[0] == ?L
+              encoder.text_token 'L', :modifier
+              match = '"'
+            end
+            encoder.text_token match, :delimiter
+            state = :string
+          
+          elsif match = scan(/ ` ([^`]+)? (`)? /x)
+            encoder.begin_group :shell
+            encoder.text_token '`', :delimiter
+            encoder.text_token self[1], :content if self[1]
+            encoder.text_token self[2], :delimiter if self[2]
+            encoder.end_group :shell
+          
+          elsif match = scan(/ \# \s* if \s* 0 /x)
+            match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
+            encoder.text_token match, :comment
+          
+          elsif match = scan(/#[ \t]*(\w*)/)
+            encoder.text_token match, :preprocessor
+            in_preproc_line = true
+            label_expected_before_preproc_line = label_expected
+            state = :include_expected if self[1] == 'include'
+          
+          elsif match = scan(/ L?' (?: [^\'\n\\] | \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) )? '? /ox)
+            label_expected = false
+            encoder.text_token match, :char
+          
+          elsif match = scan(/\$/)
+            encoder.text_token match, :ident
+          
+          elsif match = scan(/-?\d*(\.\d*)?([eE][+-]?\d+)?i/)
+            label_expected = false
+            encoder.text_token match, :imaginary
+          
+          elsif match = scan(/-?0[xX][0-9A-Fa-f]+/)
+            label_expected = false
+            encoder.text_token match, :hex
+          
+          elsif match = scan(/-?(?:0[0-7]+)(?![89.eEfF])/)
+            label_expected = false
+            encoder.text_token match, :octal
+          
+          elsif match = scan(/-?(?:\d*\.\d+|\d+\.)(?:[eE][+-]?\d+)?|\d+[eE][+-]?\d+/)
+            label_expected = false
+            encoder.text_token match, :float
+          
+          elsif match = scan(/-?(?:\d+)(?![.eEfF])L?L?/)
+            label_expected = false
+            encoder.text_token match, :integer
+          
+          else
+            encoder.text_token getch, :error
+          
+          end
+        
+        when :string
+          if match = scan(/[^\\\n"]+/)
+            encoder.text_token match, :content
+          elsif match = scan(/"/)
+            encoder.text_token match, :delimiter
+            encoder.end_group :string
+            state = :initial
+            label_expected = false
+          elsif match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
+            encoder.text_token match, :char
+          elsif match = scan(/ \\ /x)
+            encoder.text_token match, :error
+          elsif match = scan(/$/)
+            encoder.end_group :string
+            state = :initial
+            label_expected = false
+          else
+            raise_inspect "else case \" reached; %p not handled." % peek(1), encoder
+          end
+        
+        when :include_expected
+          if match = scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
+            encoder.text_token match, :include
+            state = :initial
+          
+          elsif match = scan(/\s+/)
+            encoder.text_token match, :space
+            state = :initial if match.index ?\n
+          
+          else
+            state = :initial
+          
+          end
+        
+        else
+          raise_inspect 'Unknown state', encoder
+        
+        end
+        
+      end
+      
+      if state == :string
+        encoder.end_group :string
+      end
+      
+      encoder
+    end
+    
+  end
+  
+end
+end