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// lex.h -- Go frontend lexer.     -*- C++ -*-
 
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
 
#ifndef GO_LEX_H
#define GO_LEX_H
 
#include <gmp.h>
#include <mpfr.h>
 
#include "operator.h"
#include "go-linemap.h"
 
struct Unicode_range;
 
// The keywords.  These must be in sorted order, other than
// KEYWORD_INVALID.  They must match the Keywords::mapping_ array in
// lex.cc.
 
enum Keyword
{
  KEYWORD_INVALID,      // Not a keyword.
  KEYWORD_ASM,
  KEYWORD_BREAK,
  KEYWORD_CASE,
  KEYWORD_CHAN,
  KEYWORD_CONST,
  KEYWORD_CONTINUE,
  KEYWORD_DEFAULT,
  KEYWORD_DEFER,
  KEYWORD_ELSE,
  KEYWORD_FALLTHROUGH,
  KEYWORD_FOR,
  KEYWORD_FUNC,
  KEYWORD_GO,
  KEYWORD_GOTO,
  KEYWORD_IF,
  KEYWORD_IMPORT,
  KEYWORD_INTERFACE,
  KEYWORD_MAP,
  KEYWORD_PACKAGE,
  KEYWORD_RANGE,
  KEYWORD_RETURN,
  KEYWORD_SELECT,
  KEYWORD_STRUCT,
  KEYWORD_SWITCH,
  KEYWORD_TYPE,
  KEYWORD_VAR
};
 
// A token returned from the lexer.
 
class Token
{
 public:
  // Token classification.
  enum Classification
  {
    // Token is invalid.
    TOKEN_INVALID,
    // Token indicates end of input.
    TOKEN_EOF,
    // Token is a keyword.
    TOKEN_KEYWORD,
    // Token is an identifier.
    TOKEN_IDENTIFIER,
    // Token is a string of characters.
    TOKEN_STRING,
    // Token is an operator.
    TOKEN_OPERATOR,
    // Token is a character constant.
    TOKEN_CHARACTER,
    // Token is an integer.
    TOKEN_INTEGER,
    // Token is a floating point number.
    TOKEN_FLOAT,
    // Token is an imaginary number.
    TOKEN_IMAGINARY
  };
 
  ~Token();
  Token(const Token&);
  Token& operator=(const Token&);
 
  // Get token classification.
  Classification
  classification() const
  { return this->classification_; }
 
  // Make a token for an invalid value.
  static Token
  make_invalid_token(Location location)
  { return Token(TOKEN_INVALID, location); }
 
  // Make a token representing end of file.
  static Token
  make_eof_token(Location location)
  { return Token(TOKEN_EOF, location); }
 
  // Make a keyword token.
  static Token
  make_keyword_token(Keyword keyword, Location location)
  {
    Token tok(TOKEN_KEYWORD, location);
    tok.u_.keyword = keyword;
    return tok;
  }
 
  // Make an identifier token.
  static Token
  make_identifier_token(const std::string& value, bool is_exported,
                        Location location)
  {
    Token tok(TOKEN_IDENTIFIER, location);
    tok.u_.identifier_value.name = new std::string(value);
    tok.u_.identifier_value.is_exported = is_exported;
    return tok;
  }
 
  // Make a quoted string token.
  static Token
  make_string_token(const std::string& value, Location location)
  {
    Token tok(TOKEN_STRING, location);
    tok.u_.string_value = new std::string(value);
    return tok;
  }
 
  // Make an operator token.
  static Token
  make_operator_token(Operator op, Location location)
  {
    Token tok(TOKEN_OPERATOR, location);
    tok.u_.op = op;
    return tok;
  }
 
  // Make a character constant token.
  static Token
  make_character_token(mpz_t val, Location location)
  {
    Token tok(TOKEN_CHARACTER, location);
    mpz_init(tok.u_.integer_value);
    mpz_swap(tok.u_.integer_value, val);
    return tok;
  }
 
  // Make an integer token.
  static Token
  make_integer_token(mpz_t val, Location location)
  {
    Token tok(TOKEN_INTEGER, location);
    mpz_init(tok.u_.integer_value);
    mpz_swap(tok.u_.integer_value, val);
    return tok;
  }
 
  // Make a float token.
  static Token
  make_float_token(mpfr_t val, Location location)
  {
    Token tok(TOKEN_FLOAT, location);
    mpfr_init(tok.u_.float_value);
    mpfr_swap(tok.u_.float_value, val);
    return tok;
  }
 
  // Make a token for an imaginary number.
  static Token
  make_imaginary_token(mpfr_t val, Location location)
  {
    Token tok(TOKEN_IMAGINARY, location);
    mpfr_init(tok.u_.float_value);
    mpfr_swap(tok.u_.float_value, val);
    return tok;
  }
 
  // Get the location of the token.
  Location
  location() const
  { return this->location_; }
 
  // Return whether this is an invalid token.
  bool
  is_invalid() const
  { return this->classification_ == TOKEN_INVALID; }
 
  // Return whether this is the EOF token.
  bool
  is_eof() const
  { return this->classification_ == TOKEN_EOF; }
 
  // Return the keyword value for a keyword token.
  Keyword
  keyword() const
  {
    go_assert(this->classification_ == TOKEN_KEYWORD);
    return this->u_.keyword;
  }
 
  // Return whether this is an identifier.
  bool
  is_identifier() const
  { return this->classification_ == TOKEN_IDENTIFIER; }
 
  // Return the identifier.
  const std::string&
  identifier() const
  {
    go_assert(this->classification_ == TOKEN_IDENTIFIER);
    return *this->u_.identifier_value.name;
  }
 
  // Return whether the identifier is exported.
  bool
  is_identifier_exported() const
  {
    go_assert(this->classification_ == TOKEN_IDENTIFIER);
    return this->u_.identifier_value.is_exported;
  }
 
  // Return whether this is a string.
  bool
  is_string() const
  {
    return this->classification_ == TOKEN_STRING;
  }
 
  // Return the value of a string.  The returned value is a string of
  // UTF-8 characters.
  std::string
  string_value() const
  {
    go_assert(this->classification_ == TOKEN_STRING);
    return *this->u_.string_value;
  }
 
  // Return the value of a character constant.
  const mpz_t*
  character_value() const
  {
    go_assert(this->classification_ == TOKEN_CHARACTER);
    return &this->u_.integer_value;
  }
 
  // Return the value of an integer.
  const mpz_t*
  integer_value() const
  {
    go_assert(this->classification_ == TOKEN_INTEGER);
    return &this->u_.integer_value;
  }
 
  // Return the value of a float.
  const mpfr_t*
  float_value() const
  {
    go_assert(this->classification_ == TOKEN_FLOAT);
    return &this->u_.float_value;
  }
 
  // Return the value of an imaginary number.
  const mpfr_t*
  imaginary_value() const
  {
    go_assert(this->classification_ == TOKEN_IMAGINARY);
    return &this->u_.float_value;
  }
 
  // Return the operator value for an operator token.
  Operator
  op() const
  {
    go_assert(this->classification_ == TOKEN_OPERATOR);
    return this->u_.op;
  }
 
  // Return whether this token is KEYWORD.
  bool
  is_keyword(Keyword keyword) const
  {
    return (this->classification_ == TOKEN_KEYWORD
            && this->u_.keyword == keyword);
  }
 
  // Return whether this token is OP.
  bool
  is_op(Operator op) const
  { return this->classification_ == TOKEN_OPERATOR && this->u_.op == op; }
 
  // Print the token for debugging.
  void
  print(FILE*) const;
 
 private:
  // Private constructor used by make_..._token functions above.
  Token(Classification, Location);
 
  // Clear the token.
  void
  clear();
 
  // The token classification.
  Classification classification_;
  union
  {
    // The keyword value for TOKEN_KEYWORD.
    Keyword keyword;
    // The token value for TOKEN_IDENTIFIER.
    struct
    {
      // The name of the identifier.  This has been mangled to only
      // include ASCII characters.
      std::string* name;
      // Whether this name should be exported.  This is true if the
      // first letter in the name is upper case.
      bool is_exported;
    } identifier_value;
    // The string value for TOKEN_STRING.
    std::string* string_value;
    // The token value for TOKEN_CHARACTER or TOKEN_INTEGER.
    mpz_t integer_value;
    // The token value for TOKEN_FLOAT or TOKEN_IMAGINARY.
    mpfr_t float_value;
    // The token value for TOKEN_OPERATOR or the keyword value
    Operator op;
  } u_;
  // The source location.
  Location location_;
};
 
// The lexer itself.
 
class Lex
{
 public:
  Lex(const char* input_file_name, FILE* input_file, Linemap *linemap);
 
  ~Lex();
 
  // Return the next token.
  Token
  next_token();
 
  // Return the contents of any current //extern comment.
  const std::string&
  extern_name() const
  { return this->extern_; }
 
  // Return whether the identifier NAME should be exported.  NAME is a
  // mangled name which includes only ASCII characters.
  static bool
  is_exported_name(const std::string& name);
 
  // Return whether the identifier NAME is invalid.  When we see an
  // invalid character we still build an identifier, but we use a
  // magic string to indicate that the identifier is invalid.  We then
  // use this to avoid knockon errors.
  static bool
  is_invalid_identifier(const std::string& name);
 
  // A helper function.  Append V to STR.  IS_CHARACTER is true if V
  // is a Unicode character which should be converted into UTF-8,
  // false if it is a byte value to be appended directly.  The
  // location is used to warn about an out of range character.
  static void
  append_char(unsigned int v, bool is_charater, std::string* str,
              Location);
 
  // A helper function.  Fetch a UTF-8 character from STR and store it
  // in *VALUE.  Return the number of bytes read from STR.  Return 0
  // if STR does not point to a valid UTF-8 character.
  static int
  fetch_char(const char* str, unsigned int *value);
 
 private:
  ssize_t
  get_line();
 
  bool
  require_line();
 
  // The current location.
  Location
  location() const;
 
  // A position CHARS column positions before the current location.
  Location
  earlier_location(int chars) const;
 
  static bool
  is_hex_digit(char);
 
  static unsigned char
  octal_value(char c)
  { return c - '0'; }
 
  Token
  make_invalid_token()
  { return Token::make_invalid_token(this->location()); }
 
  Token
  make_eof_token()
  { return Token::make_eof_token(this->location()); }
 
  Token
  make_operator(Operator op, int chars)
  { return Token::make_operator_token(op, this->earlier_location(chars)); }
 
  Token
  gather_identifier();
 
  static bool
  could_be_exponent(const char*, const char*);
 
  Token
  gather_number();
 
  Token
  gather_character();
 
  Token
  gather_string();
 
  Token
  gather_raw_string();
 
  const char*
  advance_one_utf8_char(const char*, unsigned int*, bool*);
 
  const char*
  advance_one_char(const char*, bool, unsigned int*, bool*);
 
  static bool
  is_unicode_digit(unsigned int c);
 
  static bool
  is_unicode_letter(unsigned int c);
 
  static bool
  is_unicode_uppercase(unsigned int c);
 
  static bool
  is_in_unicode_range(unsigned int C, const Unicode_range* ranges,
                      size_t range_size);
 
  Operator
  three_character_operator(char, char, char);
 
  Operator
  two_character_operator(char, char);
 
  Operator
  one_character_operator(char);
 
  bool
  skip_c_comment();
 
  void
  skip_cpp_comment();
 
  // The input file name.
  const char* input_file_name_;
  // The input file.
  FILE* input_file_;
  // The object used to keep track of file names and line numbers.
  Linemap* linemap_;
  // The line buffer.  This holds the current line.
  char* linebuf_;
  // The size of the line buffer.
  size_t linebufsize_;
  // The nmber of characters in the current line.
  size_t linesize_;
  // The current offset in linebuf_.
  size_t lineoff_;
  // The current line number.
  size_t lineno_;
  // Whether to add a semicolon if we see a newline now.
  bool add_semi_at_eol_;
  // The external name to use for a function declaration, from a magic
  // //extern comment.
  std::string extern_;
};
 
#endif // !defined(GO_LEX_H)

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [go/] [gofrontend/] [lex.h] - Blame information for rev 774

Line No.	Rev	Author	Line
1	714	jeremybenn	`// lex.h -- Go frontend lexer. -- C++ --`
2
3			`// Copyright 2009 The Go Authors. All rights reserved.`
4			`// Use of this source code is governed by a BSD-style`
5			`// license that can be found in the LICENSE file.`
6
7			`#ifndef GO_LEX_H`
8			`#define GO_LEX_H`
9
10			`#include <gmp.h>`
11			`#include <mpfr.h>`
12
13			`#include "operator.h"`
14			`#include "go-linemap.h"`
15
16			`struct Unicode_range;`
17
18			`// The keywords. These must be in sorted order, other than`
19			`// KEYWORD_INVALID. They must match the Keywords::mapping_ array in`
20			`// lex.cc.`
21
22			`enum Keyword`
23			`{`
24			`KEYWORD_INVALID, // Not a keyword.`
25			`KEYWORD_ASM,`
26			`KEYWORD_BREAK,`
27			`KEYWORD_CASE,`
28			`KEYWORD_CHAN,`
29			`KEYWORD_CONST,`
30			`KEYWORD_CONTINUE,`
31			`KEYWORD_DEFAULT,`
32			`KEYWORD_DEFER,`
33			`KEYWORD_ELSE,`
34			`KEYWORD_FALLTHROUGH,`
35			`KEYWORD_FOR,`
36			`KEYWORD_FUNC,`
37			`KEYWORD_GO,`
38			`KEYWORD_GOTO,`
39			`KEYWORD_IF,`
40			`KEYWORD_IMPORT,`
41			`KEYWORD_INTERFACE,`
42			`KEYWORD_MAP,`
43			`KEYWORD_PACKAGE,`
44			`KEYWORD_RANGE,`
45			`KEYWORD_RETURN,`
46			`KEYWORD_SELECT,`
47			`KEYWORD_STRUCT,`
48			`KEYWORD_SWITCH,`
49			`KEYWORD_TYPE,`
50			`KEYWORD_VAR`
51			`};`
52
53			`// A token returned from the lexer.`
54
55			`class Token`
56			`{`
57			`public:`
58			`// Token classification.`
59			`enum Classification`
60			`{`
61			`// Token is invalid.`
62			`TOKEN_INVALID,`
63			`// Token indicates end of input.`
64			`TOKEN_EOF,`
65			`// Token is a keyword.`
66			`TOKEN_KEYWORD,`
67			`// Token is an identifier.`
68			`TOKEN_IDENTIFIER,`
69			`// Token is a string of characters.`
70			`TOKEN_STRING,`
71			`// Token is an operator.`
72			`TOKEN_OPERATOR,`
73			`// Token is a character constant.`
74			`TOKEN_CHARACTER,`
75			`// Token is an integer.`
76			`TOKEN_INTEGER,`
77			`// Token is a floating point number.`
78			`TOKEN_FLOAT,`
79			`// Token is an imaginary number.`
80			`TOKEN_IMAGINARY`
81			`};`
82
83			`~Token();`
84			`Token(const Token&);`
85			`Token& operator=(const Token&);`
86
87			`// Get token classification.`
88			`Classification`
89			`classification() const`
90			`{ return this->classification_; }`
91
92			`// Make a token for an invalid value.`
93			`static Token`
94			`make_invalid_token(Location location)`
95			`{ return Token(TOKEN_INVALID, location); }`
96
97			`// Make a token representing end of file.`
98			`static Token`
99			`make_eof_token(Location location)`
100			`{ return Token(TOKEN_EOF, location); }`
101
102			`// Make a keyword token.`
103			`static Token`
104			`make_keyword_token(Keyword keyword, Location location)`
105			`{`
106			`Token tok(TOKEN_KEYWORD, location);`
107			`tok.u_.keyword = keyword;`
108			`return tok;`
109			`}`
110
111			`// Make an identifier token.`
112			`static Token`
113			`make_identifier_token(const std::string& value, bool is_exported,`
114			`Location location)`
115			`{`
116			`Token tok(TOKEN_IDENTIFIER, location);`
117			`tok.u_.identifier_value.name = new std::string(value);`
118			`tok.u_.identifier_value.is_exported = is_exported;`
119			`return tok;`
120			`}`
121
122			`// Make a quoted string token.`
123			`static Token`
124			`make_string_token(const std::string& value, Location location)`
125			`{`
126			`Token tok(TOKEN_STRING, location);`
127			`tok.u_.string_value = new std::string(value);`
128			`return tok;`
129			`}`
130
131			`// Make an operator token.`
132			`static Token`
133			`make_operator_token(Operator op, Location location)`
134			`{`
135			`Token tok(TOKEN_OPERATOR, location);`
136			`tok.u_.op = op;`
137			`return tok;`
138			`}`
139
140			`// Make a character constant token.`
141			`static Token`
142			`make_character_token(mpz_t val, Location location)`
143			`{`
144			`Token tok(TOKEN_CHARACTER, location);`
145			`mpz_init(tok.u_.integer_value);`
146			`mpz_swap(tok.u_.integer_value, val);`
147			`return tok;`
148			`}`
149
150			`// Make an integer token.`
151			`static Token`
152			`make_integer_token(mpz_t val, Location location)`
153			`{`
154			`Token tok(TOKEN_INTEGER, location);`
155			`mpz_init(tok.u_.integer_value);`
156			`mpz_swap(tok.u_.integer_value, val);`
157			`return tok;`
158			`}`
159
160			`// Make a float token.`
161			`static Token`
162			`make_float_token(mpfr_t val, Location location)`
163			`{`
164			`Token tok(TOKEN_FLOAT, location);`
165			`mpfr_init(tok.u_.float_value);`
166			`mpfr_swap(tok.u_.float_value, val);`
167			`return tok;`
168			`}`
169
170			`// Make a token for an imaginary number.`
171			`static Token`
172			`make_imaginary_token(mpfr_t val, Location location)`
173			`{`
174			`Token tok(TOKEN_IMAGINARY, location);`
175			`mpfr_init(tok.u_.float_value);`
176			`mpfr_swap(tok.u_.float_value, val);`
177			`return tok;`
178			`}`
179
180			`// Get the location of the token.`
181			`Location`
182			`location() const`
183			`{ return this->location_; }`
184
185			`// Return whether this is an invalid token.`
186			`bool`
187			`is_invalid() const`
188			`{ return this->classification_ == TOKEN_INVALID; }`
189
190			`// Return whether this is the EOF token.`
191			`bool`
192			`is_eof() const`
193			`{ return this->classification_ == TOKEN_EOF; }`
194
195			`// Return the keyword value for a keyword token.`
196			`Keyword`
197			`keyword() const`
198			`{`
199			`go_assert(this->classification_ == TOKEN_KEYWORD);`
200			`return this->u_.keyword;`
201			`}`
202
203			`// Return whether this is an identifier.`
204			`bool`
205			`is_identifier() const`
206			`{ return this->classification_ == TOKEN_IDENTIFIER; }`
207
208			`// Return the identifier.`
209			`const std::string&`
210			`identifier() const`
211			`{`
212			`go_assert(this->classification_ == TOKEN_IDENTIFIER);`
213			`return *this->u_.identifier_value.name;`
214			`}`
215
216			`// Return whether the identifier is exported.`
217			`bool`
218			`is_identifier_exported() const`
219			`{`
220			`go_assert(this->classification_ == TOKEN_IDENTIFIER);`
221			`return this->u_.identifier_value.is_exported;`
222			`}`
223
224			`// Return whether this is a string.`
225			`bool`
226			`is_string() const`
227			`{`
228			`return this->classification_ == TOKEN_STRING;`
229			`}`
230
231			`// Return the value of a string. The returned value is a string of`
232			`// UTF-8 characters.`
233			`std::string`
234			`string_value() const`
235			`{`
236			`go_assert(this->classification_ == TOKEN_STRING);`
237			`return *this->u_.string_value;`
238			`}`
239
240			`// Return the value of a character constant.`
241			`const mpz_t*`
242			`character_value() const`
243			`{`
244			`go_assert(this->classification_ == TOKEN_CHARACTER);`
245			`return &this->u_.integer_value;`
246			`}`
247
248			`// Return the value of an integer.`
249			`const mpz_t*`
250			`integer_value() const`
251			`{`
252			`go_assert(this->classification_ == TOKEN_INTEGER);`
253			`return &this->u_.integer_value;`
254			`}`
255
256			`// Return the value of a float.`
257			`const mpfr_t*`
258			`float_value() const`
259			`{`
260			`go_assert(this->classification_ == TOKEN_FLOAT);`
261			`return &this->u_.float_value;`
262			`}`
263
264			`// Return the value of an imaginary number.`
265			`const mpfr_t*`
266			`imaginary_value() const`
267			`{`
268			`go_assert(this->classification_ == TOKEN_IMAGINARY);`
269			`return &this->u_.float_value;`
270			`}`
271
272			`// Return the operator value for an operator token.`
273			`Operator`
274			`op() const`
275			`{`
276			`go_assert(this->classification_ == TOKEN_OPERATOR);`
277			`return this->u_.op;`
278			`}`
279
280			`// Return whether this token is KEYWORD.`
281			`bool`
282			`is_keyword(Keyword keyword) const`
283			`{`
284			`return (this->classification_ == TOKEN_KEYWORD`
285			`&& this->u_.keyword == keyword);`
286			`}`
287
288			`// Return whether this token is OP.`
289			`bool`
290			`is_op(Operator op) const`
291			`{ return this->classification_ == TOKEN_OPERATOR && this->u_.op == op; }`
292
293			`// Print the token for debugging.`
294			`void`
295			`print(FILE*) const;`
296
297			`private:`
298			`// Private constructor used by make_..._token functions above.`
299			`Token(Classification, Location);`
300
301			`// Clear the token.`
302			`void`
303			`clear();`
304
305			`// The token classification.`
306			`Classification classification_;`
307			`union`
308			`{`
309			`// The keyword value for TOKEN_KEYWORD.`
310			`Keyword keyword;`
311			`// The token value for TOKEN_IDENTIFIER.`
312			`struct`
313			`{`
314			`// The name of the identifier. This has been mangled to only`
315			`// include ASCII characters.`
316			`std::string* name;`
317			`// Whether this name should be exported. This is true if the`
318			`// first letter in the name is upper case.`
319			`bool is_exported;`
320			`} identifier_value;`
321			`// The string value for TOKEN_STRING.`
322			`std::string* string_value;`
323			`// The token value for TOKEN_CHARACTER or TOKEN_INTEGER.`
324			`mpz_t integer_value;`
325			`// The token value for TOKEN_FLOAT or TOKEN_IMAGINARY.`
326			`mpfr_t float_value;`
327			`// The token value for TOKEN_OPERATOR or the keyword value`
328			`Operator op;`
329			`} u_;`
330			`// The source location.`
331			`Location location_;`
332			`};`
333
334			`// The lexer itself.`
335
336			`class Lex`
337			`{`
338			`public:`
339			`Lex(const char* input_file_name, FILE* input_file, Linemap *linemap);`
340
341			`~Lex();`
342
343			`// Return the next token.`
344			`Token`
345			`next_token();`
346
347			`// Return the contents of any current //extern comment.`
348			`const std::string&`
349			`extern_name() const`
350			`{ return this->extern_; }`
351
352			`// Return whether the identifier NAME should be exported. NAME is a`
353			`// mangled name which includes only ASCII characters.`
354			`static bool`
355			`is_exported_name(const std::string& name);`
356
357			`// Return whether the identifier NAME is invalid. When we see an`
358			`// invalid character we still build an identifier, but we use a`
359			`// magic string to indicate that the identifier is invalid. We then`
360			`// use this to avoid knockon errors.`
361			`static bool`
362			`is_invalid_identifier(const std::string& name);`
363
364			`// A helper function. Append V to STR. IS_CHARACTER is true if V`
365			`// is a Unicode character which should be converted into UTF-8,`
366			`// false if it is a byte value to be appended directly. The`
367			`// location is used to warn about an out of range character.`
368			`static void`
369			`append_char(unsigned int v, bool is_charater, std::string* str,`
370			`Location);`
371
372			`// A helper function. Fetch a UTF-8 character from STR and store it`
373			`// in *VALUE. Return the number of bytes read from STR. Return 0`
374			`// if STR does not point to a valid UTF-8 character.`
375			`static int`
376			`fetch_char(const char* str, unsigned int *value);`
377
378			`private:`
379			`ssize_t`
380			`get_line();`
381
382			`bool`
383			`require_line();`
384
385			`// The current location.`
386			`Location`
387			`location() const;`
388
389			`// A position CHARS column positions before the current location.`
390			`Location`
391			`earlier_location(int chars) const;`
392
393			`static bool`
394			`is_hex_digit(char);`
395
396			`static unsigned char`
397			`octal_value(char c)`
398			`{ return c - '0'; }`
399
400			`Token`
401			`make_invalid_token()`
402			`{ return Token::make_invalid_token(this->location()); }`
403
404			`Token`
405			`make_eof_token()`
406			`{ return Token::make_eof_token(this->location()); }`
407
408			`Token`
409			`make_operator(Operator op, int chars)`
410			`{ return Token::make_operator_token(op, this->earlier_location(chars)); }`
411
412			`Token`
413			`gather_identifier();`
414
415			`static bool`
416			`could_be_exponent(const char, const char);`
417
418			`Token`
419			`gather_number();`
420
421			`Token`
422			`gather_character();`
423
424			`Token`
425			`gather_string();`
426
427			`Token`
428			`gather_raw_string();`
429
430			`const char*`
431			`advance_one_utf8_char(const char, unsigned int, bool*);`
432
433			`const char*`
434			`advance_one_char(const char, bool, unsigned int, bool*);`
435
436			`static bool`
437			`is_unicode_digit(unsigned int c);`
438
439			`static bool`
440			`is_unicode_letter(unsigned int c);`
441
442			`static bool`
443			`is_unicode_uppercase(unsigned int c);`
444
445			`static bool`
446			`is_in_unicode_range(unsigned int C, const Unicode_range* ranges,`
447			`size_t range_size);`
448
449			`Operator`
450			`three_character_operator(char, char, char);`
451
452			`Operator`
453			`two_character_operator(char, char);`
454
455			`Operator`
456			`one_character_operator(char);`
457
458			`bool`
459			`skip_c_comment();`
460
461			`void`
462			`skip_cpp_comment();`
463
464			`// The input file name.`
465			`const char* input_file_name_;`
466			`// The input file.`
467			`FILE* input_file_;`
468			`// The object used to keep track of file names and line numbers.`
469			`Linemap* linemap_;`
470			`// The line buffer. This holds the current line.`
471			`char* linebuf_;`
472			`// The size of the line buffer.`
473			`size_t linebufsize_;`
474			`// The nmber of characters in the current line.`
475			`size_t linesize_;`
476			`// The current offset in linebuf_.`
477			`size_t lineoff_;`
478			`// The current line number.`
479			`size_t lineno_;`
480			`// Whether to add a semicolon if we see a newline now.`
481			`bool add_semi_at_eol_;`
482			`// The external name to use for a function declaration, from a magic`
483			`// //extern comment.`
484			`std::string extern_;`
485			`};`
486
487			`#endif // !defined(GO_LEX_H)`