Module: AdLint::Cc1::Scanner

Includes:
ScannerConstants
Included in:
Language::C
Defined in:
lib/adlint/cc1/scanner.rb

Overview

DESCRIPTION

Utility module for scanning the C source code.

Constant Summary

Constants included from ScannerConstants

AdLint::Cc1::ScannerConstants::KEYWORDS, AdLint::Cc1::ScannerConstants::KEYWORD_VALUES, AdLint::Cc1::ScannerConstants::PUNCTUATORS

Instance Method Summary collapse

Instance Method Details

#scan_char_constant(cont) ⇒ Object

DESCRIPTION

Scans C character constant.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C character constant string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 187

def scan_char_constant(cont)
  unless scanned = cont.scan(/L?'/i)
    return nil
  end

  until cont.empty?
    if str = cont.scan(/.*?(?=\\|')/m)
      scanned << str
    end
    next if cont.scan(/\\[ \t]*\n/)

    case
    when cont.check(/\\/)
      scanned << cont.eat!(2)
    when quote = cont.scan(/'/)
      scanned << quote
      break
    end
  end

  scanned
end

#scan_floating_constant(cont) ⇒ Object

DESCRIPTION

Scans C floating constant.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C floating constant string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 174

def scan_floating_constant(cont)
  cont.scan(FLOATING1_RE) || cont.scan(FLOATING2_RE)
end

#scan_identifier(cont) ⇒ Object

DESCRIPTION

Scans C identifier.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C identifier string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 108

def scan_identifier(cont)
  cont.scan(/[a-z_][a-z_0-9]*\b/i)
end

#scan_integer_constant(cont) ⇒ Object

DESCRIPTION

Scans C integer constant.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C integer constant string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 157

def scan_integer_constant(cont)
  cont.scan(/(?:0x[0-9a-f]*|0b[01]*|[0-9]+)[UL]*/i)
end

#scan_keyword(cont) ⇒ Object

DESCRIPTION

Scans C keyword.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C keyword string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 125

def scan_keyword(cont)
  cont.scan(KEYWORDS_RE)
end

#scan_null_constant(cont) ⇒ Object

DESCRIPTION

Scans C NULL constant.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C NULL constant string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 250

def scan_null_constant(cont)
  cont.scan(/NULL\b/)
end

#scan_punctuator(cont) ⇒ Object

DESCRIPTION

Scans C punctuator.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C punctuator string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 144

def scan_punctuator(cont)
  cont.scan(PUNCTUATORS_RE)
end

#scan_string_literal(cont) ⇒ Object

DESCRIPTION

Scans C string literal.

PARAMETER

cont

StringContent – Scanning source.

RETURN VALUE

String – Returns C string literal string if found at head of the content.



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# File 'lib/adlint/cc1/scanner.rb', line 219

def scan_string_literal(cont)
  unless scanned = cont.scan(/L?"/i)
    return nil
  end

  until cont.empty?
    if str = cont.scan(/.*?(?=\\|")/m)
      scanned << str
    end
    next if cont.scan(/\\[ \t]*\n/)

    case
    when cont.check(/\\/)
      scanned << cont.eat!(2)
    when quote = cont.scan(/"/)
      scanned << quote
      break
    end
  end

  scanned
end