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go.c
843 lines (745 loc) · 18.7 KB
/
go.c
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/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include "entry.h"
#include "keyword.h"
#include "read.h"
#include "main.h"
#include "vstring.h"
#include "options.h"
/*
* MACROS
*/
#define MAX_SIGNATURE_LENGTH 512
#define isType(token,t) (boolean) ((token)->type == (t))
#define isKeyword(token,k) (boolean) ((token)->keyword == (k))
/*
* DATA DECLARATIONS
*/
typedef enum eKeywordId {
KEYWORD_NONE = -1,
KEYWORD_package,
KEYWORD_import,
KEYWORD_const,
KEYWORD_type,
KEYWORD_var,
KEYWORD_func,
KEYWORD_struct,
KEYWORD_interface,
KEYWORD_map,
KEYWORD_chan
} keywordId;
/* Used to determine whether keyword is valid for the current language and
* what its ID is.
*/
typedef struct sKeywordDesc {
const char *name;
keywordId id;
} keywordDesc;
typedef enum eTokenType {
TOKEN_NONE = -1,
// Token not important for top-level Go parsing
TOKEN_OTHER,
TOKEN_KEYWORD,
TOKEN_IDENTIFIER,
TOKEN_STRING,
TOKEN_OPEN_PAREN,
TOKEN_CLOSE_PAREN,
TOKEN_OPEN_CURLY,
TOKEN_CLOSE_CURLY,
TOKEN_OPEN_SQUARE,
TOKEN_CLOSE_SQUARE,
TOKEN_SEMICOLON,
TOKEN_STAR,
TOKEN_LEFT_ARROW,
TOKEN_DOT,
TOKEN_COMMA,
TOKEN_EOF
} tokenType;
typedef struct sTokenInfo {
tokenType type;
keywordId keyword;
vString *string; /* the name of the token */
unsigned long lineNumber; /* line number of tag */
MIOPos filePosition; /* file position of line containing name */
} tokenInfo;
/*
* DATA DEFINITIONS
*/
static int Lang_go;
static vString *scope;
static vString *signature = NULL;
typedef enum {
GOTAG_UNDEFINED = -1,
GOTAG_PACKAGE,
GOTAG_FUNCTION,
GOTAG_CONST,
GOTAG_TYPE,
GOTAG_VAR,
GOTAG_STRUCT,
GOTAG_INTERFACE,
GOTAG_MEMBER
} goKind;
static kindOption GoKinds[] = {
{TRUE, 'p', "package", "packages"},
{TRUE, 'f', "func", "functions"},
{TRUE, 'c', "const", "constants"},
{TRUE, 't', "type", "types"},
{TRUE, 'v', "var", "variables"},
{TRUE, 's', "struct", "structs"},
{TRUE, 'i', "interface", "interfaces"},
{TRUE, 'm', "member", "struct members"}
};
static keywordDesc GoKeywordTable[] = {
{"package", KEYWORD_package},
{"import", KEYWORD_import},
{"const", KEYWORD_const},
{"type", KEYWORD_type},
{"var", KEYWORD_var},
{"func", KEYWORD_func},
{"struct", KEYWORD_struct},
{"interface", KEYWORD_interface},
{"map", KEYWORD_map},
{"chan", KEYWORD_chan}
};
/*
* FUNCTION DEFINITIONS
*/
// XXX UTF-8
static boolean isStartIdentChar (const int c)
{
return (boolean)
(isalpha (c) || c == '_' || c > 128);
}
static boolean isIdentChar (const int c)
{
return (boolean)
(isStartIdentChar (c) || isdigit (c));
}
static void initialize (const langType language)
{
size_t i;
const size_t count =
sizeof (GoKeywordTable) / sizeof (GoKeywordTable[0]);
Lang_go = language;
for (i = 0; i < count; ++i)
{
const keywordDesc *const p = &GoKeywordTable[i];
addKeyword (p->name, language, (int) p->id);
}
}
static tokenInfo *newToken (void)
{
tokenInfo *const token = xMalloc (1, tokenInfo);
token->type = TOKEN_NONE;
token->keyword = KEYWORD_NONE;
token->string = vStringNew ();
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
return token;
}
static tokenInfo *copyToken (tokenInfo *other)
{
tokenInfo *const token = xMalloc (1, tokenInfo);
token->type = other->type;
token->keyword = other->keyword;
token->string = vStringNewCopy (other->string);
token->lineNumber = other->lineNumber;
token->filePosition = other->filePosition;
return token;
}
static void deleteToken (tokenInfo * const token)
{
if (token != NULL)
{
vStringDelete (token->string);
eFree (token);
}
}
/*
* Parsing functions
*/
static void parseString (vString *const string, const int delimiter)
{
boolean end = FALSE;
while (!end)
{
int c = fileGetc ();
if (c == EOF)
end = TRUE;
else if (c == '\\' && delimiter != '`')
{
c = fileGetc ();
if (c != '\'' && c != '\"')
vStringPut (string, '\\');
vStringPut (string, c);
}
else if (c == delimiter)
end = TRUE;
else
vStringPut (string, c);
}
vStringTerminate (string);
}
static void parseIdentifier (vString *const string, const int firstChar)
{
int c = firstChar;
do
{
vStringPut (string, c);
c = fileGetc ();
} while (isIdentChar (c));
vStringTerminate (string);
fileUngetc (c); /* always unget, LF might add a semicolon */
}
static void readToken (tokenInfo *const token)
{
int c;
static tokenType lastTokenType = TOKEN_NONE;
boolean firstWhitespace = TRUE;
boolean whitespace;
token->type = TOKEN_NONE;
token->keyword = KEYWORD_NONE;
vStringClear (token->string);
getNextChar:
do
{
c = fileGetc ();
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
if (c == '\n' && (lastTokenType == TOKEN_IDENTIFIER ||
lastTokenType == TOKEN_STRING ||
lastTokenType == TOKEN_OTHER ||
lastTokenType == TOKEN_CLOSE_PAREN ||
lastTokenType == TOKEN_CLOSE_CURLY ||
lastTokenType == TOKEN_CLOSE_SQUARE))
{
c = ';'; // semicolon injection
}
whitespace = c == '\t' || c == ' ' || c == '\r' || c == '\n';
if (signature && whitespace && firstWhitespace && vStringLength (signature) < MAX_SIGNATURE_LENGTH)
{
firstWhitespace = FALSE;
vStringPut(signature, ' ');
}
}
while (whitespace);
switch (c)
{
case EOF:
token->type = TOKEN_EOF;
break;
case ';':
token->type = TOKEN_SEMICOLON;
break;
case '/':
{
boolean hasNewline = FALSE;
int d = fileGetc ();
switch (d)
{
case '/':
fileSkipToCharacter ('\n');
/* Line comments start with the
* character sequence // and
* continue through the next
* newline. A line comment acts
* like a newline. */
fileUngetc ('\n');
goto getNextChar;
case '*':
do
{
do
{
d = fileGetc ();
if (d == '\n')
{
hasNewline = TRUE;
}
} while (d != EOF && d != '*');
c = fileGetc ();
if (c == '/')
break;
else
fileUngetc (c);
} while (c != EOF && c != '\0');
fileUngetc (hasNewline ? '\n' : ' ');
goto getNextChar;
default:
token->type = TOKEN_OTHER;
fileUngetc (d);
break;
}
}
break;
case '"':
case '\'':
case '`':
token->type = TOKEN_STRING;
parseString (token->string, c);
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
break;
case '<':
{
int d = fileGetc ();
if (d == '-')
token->type = TOKEN_LEFT_ARROW;
else
{
fileUngetc (d);
token->type = TOKEN_OTHER;
}
}
break;
case '(':
token->type = TOKEN_OPEN_PAREN;
break;
case ')':
token->type = TOKEN_CLOSE_PAREN;
break;
case '{':
token->type = TOKEN_OPEN_CURLY;
break;
case '}':
token->type = TOKEN_CLOSE_CURLY;
break;
case '[':
token->type = TOKEN_OPEN_SQUARE;
break;
case ']':
token->type = TOKEN_CLOSE_SQUARE;
break;
case '*':
token->type = TOKEN_STAR;
break;
case '.':
token->type = TOKEN_DOT;
break;
case ',':
token->type = TOKEN_COMMA;
break;
default:
if (isStartIdentChar (c))
{
parseIdentifier (token->string, c);
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
token->keyword = lookupKeyword (vStringValue (token->string), Lang_go);
if (isKeyword (token, KEYWORD_NONE))
token->type = TOKEN_IDENTIFIER;
else
token->type = TOKEN_KEYWORD;
}
else
token->type = TOKEN_OTHER;
break;
}
if (signature && vStringLength (signature) < MAX_SIGNATURE_LENGTH)
{
if (token->type == TOKEN_LEFT_ARROW)
vStringCatS(signature, "<-");
else if (token->type == TOKEN_STRING)
{
// only struct member annotations can appear in function prototypes
// so only `` type strings are possible
vStringPut(signature, '`');
vStringCat(signature, token->string);
vStringPut(signature, '`');
}
else if (token->type == TOKEN_IDENTIFIER || token->type == TOKEN_KEYWORD)
vStringCat(signature, token->string);
else if (c != EOF)
vStringPut(signature, c);
}
lastTokenType = token->type;
}
static boolean skipToMatchedNoRead (tokenInfo *const token)
{
int nest_level = 0;
tokenType open_token = token->type;
tokenType close_token;
switch (open_token)
{
case TOKEN_OPEN_PAREN:
close_token = TOKEN_CLOSE_PAREN;
break;
case TOKEN_OPEN_CURLY:
close_token = TOKEN_CLOSE_CURLY;
break;
case TOKEN_OPEN_SQUARE:
close_token = TOKEN_CLOSE_SQUARE;
break;
default:
return FALSE;
}
/*
* This routine will skip to a matching closing token.
* It will also handle nested tokens.
*/
nest_level++;
while (nest_level > 0 && !isType (token, TOKEN_EOF))
{
readToken (token);
if (isType (token, open_token))
nest_level++;
else if (isType (token, close_token))
nest_level--;
}
return TRUE;
}
static void skipToMatched (tokenInfo *const token)
{
if (skipToMatchedNoRead (token))
readToken (token);
}
static boolean skipType (tokenInfo *const token)
{
// Type = TypeName | TypeLit | "(" Type ")" .
// Skips also function multiple return values "(" Type {"," Type} ")"
if (isType (token, TOKEN_OPEN_PAREN))
{
skipToMatched (token);
return TRUE;
}
// TypeName = QualifiedIdent.
// QualifiedIdent = [ PackageName "." ] identifier .
// PackageName = identifier .
if (isType (token, TOKEN_IDENTIFIER))
{
readToken (token);
if (isType (token, TOKEN_DOT))
{
readToken (token);
if (isType (token, TOKEN_IDENTIFIER))
readToken (token);
}
return TRUE;
}
// StructType = "struct" "{" { FieldDecl ";" } "}"
// InterfaceType = "interface" "{" { MethodSpec ";" } "}" .
if (isKeyword (token, KEYWORD_struct) || isKeyword (token, KEYWORD_interface))
{
readToken (token);
// skip over "{}"
skipToMatched (token);
return TRUE;
}
// ArrayType = "[" ArrayLength "]" ElementType .
// SliceType = "[" "]" ElementType .
// ElementType = Type .
if (isType (token, TOKEN_OPEN_SQUARE))
{
skipToMatched (token);
return skipType (token);
}
// PointerType = "*" BaseType .
// BaseType = Type .
// ChannelType = ( "chan" [ "<-" ] | "<-" "chan" ) ElementType .
if (isType (token, TOKEN_STAR) || isKeyword (token, KEYWORD_chan) || isType (token, TOKEN_LEFT_ARROW))
{
readToken (token);
return skipType (token);
}
// MapType = "map" "[" KeyType "]" ElementType .
// KeyType = Type .
if (isKeyword (token, KEYWORD_map))
{
readToken (token);
// skip over "[]"
skipToMatched (token);
return skipType (token);
}
// FunctionType = "func" Signature .
// Signature = Parameters [ Result ] .
// Result = Parameters | Type .
// Parameters = "(" [ ParameterList [ "," ] ] ")" .
if (isKeyword (token, KEYWORD_func))
{
readToken (token);
// Parameters, skip over "()"
skipToMatched (token);
// Result is parameters or type or nothing. skipType treats anything
// surrounded by parentheses as a type, and does nothing if what
// follows is not a type.
return skipType (token);
}
return FALSE;
}
static void makeTag (tokenInfo *const token, const goKind kind,
tokenInfo *const parent_token, const goKind parent_kind,
const char *argList, const char *varType)
{
const char *const name = vStringValue (token->string);
tagEntryInfo e;
initTagEntry (&e, name);
if (!GoKinds [kind].enabled)
return;
e.lineNumber = token->lineNumber;
e.filePosition = token->filePosition;
e.kindName = GoKinds [kind].name;
e.kind = GoKinds [kind].letter;
if (argList)
e.extensionFields.arglist = argList;
if (varType)
e.extensionFields.varType = varType;
if (parent_kind != GOTAG_UNDEFINED && parent_token != NULL)
{
e.extensionFields.scope[0] = GoKinds[parent_kind].name;
e.extensionFields.scope[1] = vStringValue (parent_token->string);
}
makeTagEntry (&e);
if (scope && Option.include.qualifiedTags)
{
vString *qualifiedName = vStringNew ();
vStringCopy (qualifiedName, scope);
vStringCatS (qualifiedName, ".");
vStringCat (qualifiedName, token->string);
e.name = vStringValue (qualifiedName);
makeTagEntry (&e);
vStringDelete (qualifiedName);
}
}
static void parsePackage (tokenInfo *const token)
{
readToken (token);
if (isType (token, TOKEN_IDENTIFIER))
{
makeTag (token, GOTAG_PACKAGE, NULL, GOTAG_UNDEFINED, NULL, NULL);
if (!scope && Option.include.qualifiedTags)
{
scope = vStringNew ();
vStringCopy (scope, token->string);
}
}
}
static void parseFunctionOrMethod (tokenInfo *const token)
{
// FunctionDecl = "func" identifier Signature [ Body ] .
// Body = Block.
//
// MethodDecl = "func" Receiver MethodName Signature [ Body ] .
// Receiver = "(" [ identifier ] [ "*" ] BaseTypeName ")" .
// BaseTypeName = identifier .
// Skip over receiver.
readToken (token);
if (isType (token, TOKEN_OPEN_PAREN))
skipToMatched (token);
if (isType (token, TOKEN_IDENTIFIER))
{
vString *argList;
tokenInfo *functionToken = copyToken (token);
// Start recording signature
signature = vStringNew ();
// Skip over parameters.
readToken (token);
skipToMatchedNoRead (token);
vStringStripLeading (signature);
vStringStripTrailing (signature);
argList = signature;
signature = vStringNew ();
readToken (token);
// Skip over result.
skipType (token);
// Remove the extra { we have just read
vStringStripTrailing (signature);
vStringChop (signature);
vStringStripLeading (signature);
vStringStripTrailing (signature);
makeTag (functionToken, GOTAG_FUNCTION, NULL, GOTAG_UNDEFINED, argList->buffer, signature->buffer);
deleteToken (functionToken);
vStringDelete(signature);
vStringDelete(argList);
// Stop recording signature
signature = NULL;
// Skip over function body.
if (isType (token, TOKEN_OPEN_CURLY))
skipToMatched (token);
}
}
static void parseStructMembers (tokenInfo *const token, tokenInfo *const parent_token)
{
// StructType = "struct" "{" { FieldDecl ";" } "}" .
// FieldDecl = (IdentifierList Type | AnonymousField) [ Tag ] .
// AnonymousField = [ "*" ] TypeName .
// Tag = string_lit .
readToken (token);
if (!isType (token, TOKEN_OPEN_CURLY))
return;
readToken (token);
while (!isType (token, TOKEN_EOF) && !isType (token, TOKEN_CLOSE_CURLY))
{
tokenInfo *memberCandidate = NULL;
boolean first = TRUE;
while (!isType (token, TOKEN_EOF))
{
if (isType (token, TOKEN_IDENTIFIER))
{
if (first)
{
// could be anonymous field like in 'struct {int}' - we don't know yet
memberCandidate = copyToken (token);
first = FALSE;
}
else
{
if (memberCandidate)
{
// if we are here, there was a comma and memberCandidate isn't an anonymous field
makeTag (memberCandidate, GOTAG_MEMBER, parent_token, GOTAG_STRUCT, NULL, NULL);
deleteToken (memberCandidate);
memberCandidate = NULL;
}
makeTag (token, GOTAG_MEMBER, parent_token, GOTAG_STRUCT, NULL, NULL);
}
readToken (token);
}
if (!isType (token, TOKEN_COMMA))
break;
readToken (token);
}
// in the case of an anonymous field, we already read part of the
// type into memberCandidate and skipType() should return FALSE so no tag should
// be generated in this case.
if (skipType (token) && memberCandidate)
makeTag (memberCandidate, GOTAG_MEMBER, parent_token, GOTAG_STRUCT, NULL, NULL);
if (memberCandidate)
deleteToken (memberCandidate);
while (!isType (token, TOKEN_SEMICOLON) && !isType (token, TOKEN_CLOSE_CURLY)
&& !isType (token, TOKEN_EOF))
{
readToken (token);
skipToMatched (token);
}
if (!isType (token, TOKEN_CLOSE_CURLY))
{
// we are at TOKEN_SEMICOLON
readToken (token);
}
}
}
static void parseConstTypeVar (tokenInfo *const token, goKind kind)
{
// ConstDecl = "const" ( ConstSpec | "(" { ConstSpec ";" } ")" ) .
// ConstSpec = IdentifierList [ [ Type ] "=" ExpressionList ] .
// IdentifierList = identifier { "," identifier } .
// ExpressionList = Expression { "," Expression } .
// TypeDecl = "type" ( TypeSpec | "(" { TypeSpec ";" } ")" ) .
// TypeSpec = identifier Type .
// VarDecl = "var" ( VarSpec | "(" { VarSpec ";" } ")" ) .
// VarSpec = IdentifierList ( Type [ "=" ExpressionList ] | "=" ExpressionList ) .
boolean usesParens = FALSE;
readToken (token);
if (isType (token, TOKEN_OPEN_PAREN))
{
usesParens = TRUE;
readToken (token);
}
do
{
tokenInfo *typeToken = NULL;
while (!isType (token, TOKEN_EOF))
{
if (isType (token, TOKEN_IDENTIFIER))
{
if (kind == GOTAG_TYPE)
{
typeToken = copyToken (token);
readToken (token);
if (isKeyword (token, KEYWORD_struct))
makeTag (typeToken, GOTAG_STRUCT, NULL, GOTAG_UNDEFINED, NULL, NULL);
else if (isKeyword (token, KEYWORD_interface))
makeTag (typeToken, GOTAG_INTERFACE, NULL, GOTAG_UNDEFINED, NULL, NULL);
else
makeTag (typeToken, kind, NULL, GOTAG_UNDEFINED, NULL, NULL);
break;
}
else
makeTag (token, kind, NULL, GOTAG_UNDEFINED, NULL, NULL);
readToken (token);
}
if (!isType (token, TOKEN_COMMA))
break;
readToken (token);
}
if (typeToken)
{
if (isKeyword (token, KEYWORD_struct))
parseStructMembers (token, typeToken);
else
skipType (token);
deleteToken (typeToken);
}
else
skipType (token);
while (!isType (token, TOKEN_SEMICOLON) && !isType (token, TOKEN_CLOSE_PAREN)
&& !isType (token, TOKEN_EOF))
{
readToken (token);
skipToMatched (token);
}
if (usesParens && !isType (token, TOKEN_CLOSE_PAREN))
{
// we are at TOKEN_SEMICOLON
readToken (token);
}
}
while (!isType (token, TOKEN_EOF) &&
usesParens && !isType (token, TOKEN_CLOSE_PAREN));
}
static void parseGoFile (tokenInfo *const token)
{
do
{
readToken (token);
if (isType (token, TOKEN_KEYWORD))
{
switch (token->keyword)
{
case KEYWORD_package:
parsePackage (token);
break;
case KEYWORD_func:
parseFunctionOrMethod (token);
break;
case KEYWORD_const:
parseConstTypeVar (token, GOTAG_CONST);
break;
case KEYWORD_type:
parseConstTypeVar (token, GOTAG_TYPE);
break;
case KEYWORD_var:
parseConstTypeVar (token, GOTAG_VAR);
break;
default:
break;
}
}
else if (isType (token, TOKEN_OPEN_PAREN) || isType (token, TOKEN_OPEN_CURLY) ||
isType (token, TOKEN_OPEN_SQUARE))
{
skipToMatched (token);
}
} while (token->type != TOKEN_EOF);
}
static void findGoTags (void)
{
tokenInfo *const token = newToken ();
parseGoFile (token);
deleteToken (token);
vStringDelete (scope);
scope = NULL;
}
extern parserDefinition *GoParser (void)
{
static const char *const extensions[] = { "go", NULL };
parserDefinition *def = parserNew ("Go");
def->kinds = GoKinds;
def->kindCount = KIND_COUNT (GoKinds);
def->extensions = extensions;
def->parser = findGoTags;
def->initialize = initialize;
return def;
}