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Kirill Smelkov
go
Commits
0cee3028
Commit
0cee3028
authored
Jul 15, 2008
by
Robert Griesemer
Browse files
Options
Browse Files
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Email Patches
Plain Diff
- func reorg to reduce forward decls and improve structure
SVN=127229
parent
d9d5f3b3
Changes
1
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Side-by-side
Showing
1 changed file
with
372 additions
and
364 deletions
+372
-364
usr/gri/gosrc/parser.go
usr/gri/gosrc/parser.go
+372
-364
No files found.
usr/gri/gosrc/parser.go
View file @
0cee3028
...
...
@@ -127,9 +127,13 @@ func (P *Parser) Declare(obj *Globals.Object) {
// ----------------------------------------------------------------------------
// Common productions
func
(
P
*
Parser
)
TryType
()
bool
;
func
(
P
*
Parser
)
ParseExpression
();
func
(
P
*
Parser
)
TryStatement
()
bool
;
func
(
P
*
Parser
)
ParseDeclaration
();
func
(
P
*
Parser
)
ParseIdent
()
{
...
...
@@ -163,12 +167,8 @@ func (P *Parser) ParseQualifiedIdent() {
}
func
(
P
*
Parser
)
ParseTypeName
()
{
P
.
Trace
(
"TypeName"
);
P
.
ParseQualifiedIdent
();
P
.
Ecart
();
}
// ----------------------------------------------------------------------------
// Types
func
(
P
*
Parser
)
ParseType
()
{
P
.
Trace
(
"Type"
);
...
...
@@ -179,6 +179,13 @@ func (P *Parser) ParseType() {
}
func
(
P
*
Parser
)
ParseTypeName
()
{
P
.
Trace
(
"TypeName"
);
P
.
ParseQualifiedIdent
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseArrayType
()
{
P
.
Trace
(
"ArrayType"
);
P
.
Expect
(
Scanner
.
LBRACK
);
...
...
@@ -204,8 +211,103 @@ func (P *Parser) ParseChannelType() {
}
func
(
P
*
Parser
)
ParseParameters
();
func
(
P
*
Parser
)
TryResult
()
bool
;
func
(
P
*
Parser
)
ParseParameterSection
()
{
P
.
Trace
(
"ParameterSection"
);
P
.
ParseIdentList
();
P
.
ParseType
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseParameterList
()
{
P
.
Trace
(
"ParameterList"
);
P
.
ParseParameterSection
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParseParameterSection
();
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseParameters
()
{
P
.
Trace
(
"Parameters"
);
P
.
Expect
(
Scanner
.
LPAREN
);
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseParameterList
();
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
TryResult
()
bool
{
P
.
Trace
(
"Result (try)"
);
res
:=
false
;
if
P
.
tok
==
Scanner
.
LPAREN
{
// TODO: here we allow empty returns - should proably fix this
P
.
ParseParameters
();
res
=
true
;
}
else
{
res
=
P
.
TryType
();
}
P
.
Ecart
();
return
res
;
}
// Anonymous signatures
//
// (params)
// (params) type
// (params) (results)
// (recv) . (params)
// (recv) . (params) type
// (recv) . (params) (results)
func
(
P
*
Parser
)
ParseAnonymousSignature
()
{
P
.
Trace
(
"AnonymousSignature"
);
P
.
OpenScope
();
P
.
ParseParameters
();
if
P
.
tok
==
Scanner
.
PERIOD
{
P
.
Next
();
P
.
ParseParameters
();
}
P
.
TryResult
();
P
.
CloseScope
();
P
.
Ecart
();
}
// Named signatures
//
// name (params)
// name (params) type
// name (params) (results)
// (recv) name (params)
// (recv) name (params) type
// (recv) name (params) (results)
func
(
P
*
Parser
)
ParseNamedSignature
()
{
P
.
Trace
(
"NamedSignature"
);
P
.
OpenScope
();
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
ParseParameters
();
}
P
.
ParseIdent
();
// function name
P
.
ParseParameters
();
P
.
TryResult
();
P
.
CloseScope
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseFunctionType
()
{
P
.
Trace
(
"FunctionType"
);
P
.
Expect
(
Scanner
.
FUNC
);
P
.
ParseAnonymousSignature
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseMethodDecl
()
{
...
...
@@ -232,17 +334,6 @@ func (P *Parser) ParseInterfaceType() {
}
func
(
P
*
Parser
)
ParseAnonymousSignature
();
func
(
P
*
Parser
)
ParseFunctionType
()
{
P
.
Trace
(
"FunctionType"
);
P
.
Expect
(
Scanner
.
FUNC
);
P
.
ParseAnonymousSignature
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseMapType
()
{
P
.
Trace
(
"MapType"
);
P
.
Expect
(
Scanner
.
MAP
);
...
...
@@ -316,51 +407,48 @@ func (P *Parser) TryType() bool {
}
func
(
P
*
Parser
)
ParseImportSpec
()
{
P
.
Trace
(
"ImportSpec"
);
if
P
.
tok
==
Scanner
.
PERIOD
{
P
.
Next
();
}
else
if
P
.
tok
==
Scanner
.
IDENT
{
P
.
Next
();
// ----------------------------------------------------------------------------
// Blocks
func
(
P
*
Parser
)
ParseStatement
()
{
P
.
Trace
(
"Statement"
);
if
!
P
.
TryStatement
()
{
P
.
Error
(
P
.
beg
,
"statement expected"
);
}
P
.
Expect
(
Scanner
.
STRING
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseImportDecl
()
{
P
.
Trace
(
"ImportDecl"
);
P
.
Expect
(
Scanner
.
IMPORT
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseImportSpec
();
P
.
Optional
(
Scanner
.
SEMICOLON
);
// TODO this seems wrong
}
P
.
Next
();
}
else
{
P
.
ParseImportSpec
();
func
(
P
*
Parser
)
ParseStatementList
()
{
P
.
Trace
(
"StatementList"
);
for
P
.
TryStatement
()
{
P
.
Optional
(
Scanner
.
SEMICOLON
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
Parse
ExpressionList
()
{
P
.
Trace
(
"
ExpressionList
"
);
P
.
ParseExpression
(
);
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
Parse
Expression
();
func
(
P
*
Parser
)
Parse
Block
()
{
P
.
Trace
(
"
Block
"
);
P
.
Expect
(
Scanner
.
LBRACE
);
P
.
OpenScope
();
if
P
.
tok
!=
Scanner
.
RBRACE
&&
P
.
tok
!=
Scanner
.
SEMICOLON
{
P
.
Parse
StatementList
();
}
P
.
Optional
(
Scanner
.
SEMICOLON
);
P
.
CloseScope
();
P
.
Expect
(
Scanner
.
RBRACE
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseConstSpec
()
{
P
.
Trace
(
"ConstSpec"
);
P
.
ParseIdent
();
P
.
TryType
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
// ----------------------------------------------------------------------------
// Expressions
func
(
P
*
Parser
)
ParseExpressionList
()
{
P
.
Trace
(
"ExpressionList"
);
P
.
ParseExpression
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParseExpression
();
}
...
...
@@ -368,197 +456,190 @@ func (P *Parser) ParseConstSpec() {
}
func
(
P
*
Parser
)
ParseConstDecl
()
{
P
.
Trace
(
"ConstDecl"
);
P
.
Expect
(
Scanner
.
CONST
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseConstSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
func
(
P
*
Parser
)
ParseNew
()
{
P
.
Trace
(
"New"
);
P
.
Expect
(
Scanner
.
NEW
);
P
.
Expect
(
Scanner
.
LPAREN
);
P
.
ParseType
();
if
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
}
else
{
P
.
ParseConstSpec
();
P
.
ParseExpressionList
()
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
Parse
TypeSpec
()
{
P
.
Trace
(
"
TypeSpec
"
);
P
.
Parse
Ident
();
P
.
TryType
();
func
(
P
*
Parser
)
Parse
FunctionLit
()
{
P
.
Trace
(
"
FunctionLit
"
);
P
.
Parse
FunctionType
();
P
.
ParseBlock
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseTypeDecl
()
{
P
.
Trace
(
"TypeDecl"
);
P
.
Expect
(
Scanner
.
TYPE
);
if
P
.
tok
==
Scanner
.
LPAREN
{
func
(
P
*
Parser
)
ParseOperand
()
{
P
.
Trace
(
"Operand"
);
switch
P
.
tok
{
case
Scanner
.
IDENT
:
P
.
ParseQualifiedIdent
();
case
Scanner
.
LPAREN
:
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseTypeSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
P
.
ParseExpression
();
P
.
Expect
(
Scanner
.
RPAREN
);
case
Scanner
.
STRING
:
fallthrough
;
case
Scanner
.
NUMBER
:
fallthrough
;
case
Scanner
.
NIL
:
fallthrough
;
case
Scanner
.
IOTA
:
fallthrough
;
case
Scanner
.
TRUE
:
fallthrough
;
case
Scanner
.
FALSE
:
P
.
Next
();
}
else
{
P
.
ParseTypeSpec
();
case
Scanner
.
FUNC
:
P
.
ParseFunctionLit
();
case
Scanner
.
NEW
:
P
.
ParseNew
();
default
:
P
.
Error
(
P
.
beg
,
"operand expected"
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseVarSpec
()
{
P
.
Trace
(
"VarSpec"
);
P
.
ParseIdentList
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
P
.
Next
();
P
.
ParseExpressionList
();
func
(
P
*
Parser
)
ParseSelectorOrTypeAssertion
()
{
P
.
Trace
(
"SelectorOrTypeAssertion"
);
P
.
Expect
(
Scanner
.
PERIOD
);
if
P
.
tok
==
Scanner
.
IDENT
{
P
.
ParseIdent
();
}
else
{
P
.
Expect
(
Scanner
.
LPAREN
);
P
.
ParseType
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
P
.
Next
();
P
.
ParseExpressionList
();
}
P
.
Expect
(
Scanner
.
RPAREN
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseVarDecl
()
{
P
.
Trace
(
"VarDecl"
);
P
.
Expect
(
Scanner
.
VAR
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseVarSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
func
(
P
*
Parser
)
ParseIndexOrSlice
()
{
P
.
Trace
(
"IndexOrSlice"
);
P
.
Expect
(
Scanner
.
LBRACK
);
P
.
ParseExpression
();
if
P
.
tok
==
Scanner
.
COLON
{
P
.
Next
();
}
else
{
P
.
ParseVarSpec
();
P
.
ParseExpression
();
}
P
.
Expect
(
Scanner
.
RBRACK
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseParameterSection
()
{
P
.
Trace
(
"ParameterSection"
);
P
.
ParseIdentList
();
P
.
ParseType
();
func
(
P
*
Parser
)
ParseInvocation
()
{
P
.
Trace
(
"Invocation"
);
P
.
Expect
(
Scanner
.
LPAREN
);
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseExpressionList
();
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseParameterList
()
{
P
.
Trace
(
"ParameterList"
);
P
.
ParseParameterSection
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParseParameterSection
();
func
(
P
*
Parser
)
ParsePrimaryExpr
()
{
P
.
Trace
(
"PrimaryExpr"
);
P
.
ParseOperand
();
for
{
switch
P
.
tok
{
case
Scanner
.
PERIOD
:
P
.
ParseSelectorOrTypeAssertion
();
case
Scanner
.
LBRACK
:
P
.
ParseIndexOrSlice
();
case
Scanner
.
LPAREN
:
P
.
ParseInvocation
();
default
:
P
.
Ecart
();
return
;
}
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseParameters
()
{
P
.
Trace
(
"Parameters"
);
P
.
Expect
(
Scanner
.
LPAREN
);
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseParameterList
();
func
(
P
*
Parser
)
ParsePrimaryExprList
()
{
P
.
Trace
(
"PrimaryExprList"
);
P
.
ParsePrimaryExpr
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParsePrimaryExpr
();
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
TryResult
()
bool
{
P
.
Trace
(
"Result (try)"
);
res
:=
false
;
if
P
.
tok
==
Scanner
.
LPAREN
{
// TODO: here we allow empty returns - should proably fix this
P
.
ParseParameters
();
res
=
true
;
}
else
{
res
=
P
.
TryType
();
func
(
P
*
Parser
)
ParseUnaryExpr
()
{
P
.
Trace
(
"UnaryExpr"
);
switch
P
.
tok
{
case
Scanner
.
ADD
:
fallthrough
;
case
Scanner
.
SUB
:
fallthrough
;
case
Scanner
.
NOT
:
fallthrough
;
case
Scanner
.
XOR
:
fallthrough
;
case
Scanner
.
LSS
:
fallthrough
;
case
Scanner
.
GTR
:
fallthrough
;
case
Scanner
.
MUL
:
fallthrough
;
case
Scanner
.
AND
:
P
.
Next
();
P
.
ParseUnaryExpr
();
P
.
Ecart
();
return
;
}
P
.
ParsePrimaryExpr
();
P
.
Ecart
();
return
res
;
}
// Anonymous signatures
//
// (params)
// (params) type
// (params) (results)
// (recv) . (params)
// (recv) . (params) type
// (recv) . (params) (results)
func
(
P
*
Parser
)
ParseAnonymousSignature
()
{
P
.
Trace
(
"AnonymousSignature"
);
P
.
OpenScope
();
P
.
ParseParameters
();
if
P
.
tok
==
Scanner
.
PERIOD
{
P
.
Next
();
P
.
ParseParameters
();
func
Precedence
(
tok
int
)
int
{
// TODO should use a map or array here for lookup
switch
tok
{
case
Scanner
.
LOR
:
return
1
;
case
Scanner
.
LAND
:
return
2
;
case
Scanner
.
EQL
,
Scanner
.
NEQ
,
Scanner
.
LSS
,
Scanner
.
LEQ
,
Scanner
.
GTR
,
Scanner
.
GEQ
:
return
3
;
case
Scanner
.
ADD
,
Scanner
.
SUB
,
Scanner
.
OR
,
Scanner
.
XOR
:
return
4
;
case
Scanner
.
MUL
,
Scanner
.
QUO
,
Scanner
.
REM
,
Scanner
.
SHL
,
Scanner
.
SHR
,
Scanner
.
AND
:
return
5
;
}
P
.
TryResult
();
P
.
CloseScope
();
P
.
Ecart
();
return
0
;
}
// Named signatures
//
// name (params)
// name (params) type
// name (params) (results)
// (recv) name (params)
// (recv) name (params) type
// (recv) name (params) (results)
func
(
P
*
Parser
)
ParseNamedSignature
()
{
P
.
Trace
(
"NamedSignature"
);
P
.
OpenScope
();
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
ParseParameters
();
func
(
P
*
Parser
)
ParseBinaryExpr
(
prec1
int
)
{
P
.
Trace
(
"BinaryExpr"
);
P
.
ParseUnaryExpr
();
for
prec
:=
Precedence
(
P
.
tok
);
prec
>=
prec1
;
prec
--
{
for
Precedence
(
P
.
tok
)
==
prec
{
P
.
Next
();
P
.
ParseBinaryExpr
(
prec
+
1
);
}
}
P
.
ParseIdent
();
// function name
P
.
ParseParameters
();
P
.
TryResult
();
P
.
CloseScope
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseDeclaration
();
func
(
P
*
Parser
)
TryStatement
()
bool
;
func
(
P
*
Parser
)
ParseStatementList
();
func
(
P
*
Parser
)
ParseBlock
();
func
(
P
*
Parser
)
ParsePrimaryExpr
();
func
(
P
*
Parser
)
ParsePrimaryExprList
()
{
P
.
Trace
(
"PrimaryExprList"
);
P
.
ParsePrimaryExpr
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParsePrimaryExpr
();
func
(
P
*
Parser
)
ParseExpression
()
{
P
.
Trace
(
"Expression"
);
indent
:=
P
.
indent
;
P
.
ParseBinaryExpr
(
1
);
if
indent
!=
P
.
indent
{
panic
"imbalanced tracing code"
;
}
P
.
Ecart
();
}
// ----------------------------------------------------------------------------
// Statements
func
(
P
*
Parser
)
ParseBuiltinStat
()
{
P
.
Trace
(
"BuiltinStat"
);
P
.
Expect
(
Scanner
.
IDENT
);
...
...
@@ -631,15 +712,6 @@ func (P *Parser) ParseControlFlowStat(tok int) {
}
func
(
P
*
Parser
)
ParseStatement
()
{
P
.
Trace
(
"Statement"
);
if
!
P
.
TryStatement
()
{
P
.
Error
(
P
.
beg
,
"statement expected"
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseIfStat
()
{
P
.
Trace
(
"IfStat"
);
P
.
Expect
(
Scanner
.
IF
);
...
...
@@ -870,258 +942,194 @@ func (P *Parser) TryStatement() bool {
}
func
(
P
*
Parser
)
ParseStatementList
()
{
P
.
Trace
(
"StatementList"
);
for
P
.
TryStatement
()
{
P
.
Optional
(
Scanner
.
SEMICOLON
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseBlock
()
{
P
.
Trace
(
"Block"
);
P
.
Expect
(
Scanner
.
LBRACE
);
P
.
OpenScope
();
if
P
.
tok
!=
Scanner
.
RBRACE
&&
P
.
tok
!=
Scanner
.
SEMICOLON
{
P
.
ParseStatementList
();
}
P
.
Optional
(
Scanner
.
SEMICOLON
);
P
.
CloseScope
();
P
.
Expect
(
Scanner
.
RBRACE
);
P
.
Ecart
();
}
// ----------------------------------------------------------------------------
// Declarations
func
(
P
*
Parser
)
ParseFuncDecl
()
{
P
.
Trace
(
"FuncDecl"
);
P
.
Expect
(
Scanner
.
FUNC
);
P
.
ParseNamedSignature
();
if
P
.
tok
==
Scanner
.
SEMICOLON
{
// forward declaration
func
(
P
*
Parser
)
ParseImportSpec
()
{
P
.
Trace
(
"ImportSpec"
);
if
P
.
tok
==
Scanner
.
PERIOD
{
P
.
Next
();
}
else
if
P
.
tok
==
Scanner
.
IDENT
{
P
.
Next
();
}
else
{
P
.
ParseBlock
();
}
P
.
Expect
(
Scanner
.
STRING
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
Parse
Ex
portDecl
()
{
P
.
Trace
(
"
Ex
portDecl"
);
P
.
Expect
(
Scanner
.
EX
PORT
);
func
(
P
*
Parser
)
Parse
Im
portDecl
()
{
P
.
Trace
(
"
Im
portDecl"
);
P
.
Expect
(
Scanner
.
IM
PORT
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseI
dent
();
P
.
Optional
(
Scanner
.
COMMA
);
// TODO this seems wrong
P
.
ParseI
mportSpec
();
P
.
Optional
(
Scanner
.
SEMICOLON
);
// TODO this seems wrong
}
P
.
Next
();
}
else
{
P
.
ParseIdent
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
ParseIdent
();
}
P
.
ParseImportSpec
();
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseDeclaration
()
{
P
.
Trace
(
"Declaration"
);
indent
:=
P
.
indent
;
switch
P
.
tok
{
case
Scanner
.
CONST
:
P
.
ParseConstDecl
();
case
Scanner
.
TYPE
:
P
.
ParseTypeDecl
();
case
Scanner
.
VAR
:
P
.
ParseVarDecl
();
case
Scanner
.
FUNC
:
P
.
ParseFuncDecl
();
case
Scanner
.
EXPORT
:
P
.
ParseExportDecl
();
default
:
P
.
Error
(
P
.
beg
,
"declaration expected"
);
}
if
indent
!=
P
.
indent
{
panic
"imbalanced tracing code"
func
(
P
*
Parser
)
ParseConstSpec
()
{
P
.
Trace
(
"ConstSpec"
);
P
.
ParseIdent
();
P
.
TryType
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
P
.
Next
();
P
.
ParseExpression
();
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseNew
()
{
P
.
Trace
(
"New"
);
P
.
Expect
(
Scanner
.
NEW
);
P
.
Expect
(
Scanner
.
LPAREN
);
P
.
ParseType
();
if
P
.
tok
==
Scanner
.
COMMA
{
func
(
P
*
Parser
)
ParseConstDecl
()
{
P
.
Trace
(
"ConstDecl"
);
P
.
Expect
(
Scanner
.
CONST
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
P
.
ParseExpressionList
()
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseConstSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
P
.
Next
();
}
else
{
P
.
ParseConstSpec
();
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
Parse
FunctionLit
()
{
P
.
Trace
(
"
FunctionLit
"
);
P
.
Parse
FunctionType
();
P
.
ParseBlock
();
func
(
P
*
Parser
)
Parse
TypeSpec
()
{
P
.
Trace
(
"
TypeSpec
"
);
P
.
Parse
Ident
();
P
.
TryType
();
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseOperand
()
{
P
.
Trace
(
"Operand"
);
switch
P
.
tok
{
case
Scanner
.
IDENT
:
P
.
ParseQualifiedIdent
();
case
Scanner
.
LPAREN
:
func
(
P
*
Parser
)
ParseTypeDecl
()
{
P
.
Trace
(
"TypeDecl"
);
P
.
Expect
(
Scanner
.
TYPE
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
P
.
ParseExpression
();
P
.
Expect
(
Scanner
.
RPAREN
);
case
Scanner
.
STRING
:
fallthrough
;
case
Scanner
.
NUMBER
:
fallthrough
;
case
Scanner
.
NIL
:
fallthrough
;
case
Scanner
.
IOTA
:
fallthrough
;
case
Scanner
.
TRUE
:
fallthrough
;
case
Scanner
.
FALSE
:
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseTypeSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
P
.
Next
();
case
Scanner
.
FUNC
:
P
.
ParseFunctionLit
();
case
Scanner
.
NEW
:
P
.
ParseNew
();
default
:
P
.
Error
(
P
.
beg
,
"operand expected"
);
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseSelectorOrTypeAssertion
()
{
P
.
Trace
(
"SelectorOrTypeAssertion"
);
P
.
Expect
(
Scanner
.
PERIOD
);
if
P
.
tok
==
Scanner
.
IDENT
{
P
.
ParseIdent
();
}
else
{
P
.
Expect
(
Scanner
.
LPAREN
);
P
.
ParseType
();
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
ParseTypeSpec
();
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseIndexOrSlice
()
{
P
.
Trace
(
"IndexOrSlice"
);
P
.
Expect
(
Scanner
.
LBRACK
);
P
.
ParseExpression
();
if
P
.
tok
==
Scanner
.
COLON
{
func
(
P
*
Parser
)
ParseVarSpec
()
{
P
.
Trace
(
"VarSpec"
);
P
.
ParseIdentList
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
P
.
Next
();
P
.
ParseExpression
();
}
P
.
Expect
(
Scanner
.
RBRACK
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseInvocation
()
{
P
.
Trace
(
"Invocation"
);
P
.
Expect
(
Scanner
.
LPAREN
);
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseExpressionList
();
}
else
{
P
.
ParseType
();
if
P
.
tok
==
Scanner
.
ASSIGN
{
P
.
Next
();
P
.
ParseExpressionList
();
}
}
P
.
Expect
(
Scanner
.
RPAREN
);
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParsePrimaryExpr
()
{
P
.
Trace
(
"PrimaryExpr"
);
P
.
ParseOperand
();
for
{
switch
P
.
tok
{
case
Scanner
.
PERIOD
:
P
.
ParseSelectorOrTypeAssertion
();
case
Scanner
.
LBRACK
:
P
.
ParseIndexOrSlice
();
case
Scanner
.
LPAREN
:
P
.
ParseInvocation
();
default
:
P
.
Ecart
();
return
;
func
(
P
*
Parser
)
ParseVarDecl
()
{
P
.
Trace
(
"VarDecl"
);
P
.
Expect
(
Scanner
.
VAR
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseVarSpec
();
if
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
Expect
(
Scanner
.
SEMICOLON
);
}
}
P
.
Next
();
}
else
{
P
.
ParseVarSpec
();
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
ParseUnaryExpr
()
{
P
.
Trace
(
"UnaryExpr"
);
switch
P
.
tok
{
case
Scanner
.
ADD
:
fallthrough
;
case
Scanner
.
SUB
:
fallthrough
;
case
Scanner
.
NOT
:
fallthrough
;
case
Scanner
.
XOR
:
fallthrough
;
case
Scanner
.
LSS
:
fallthrough
;
case
Scanner
.
GTR
:
fallthrough
;
case
Scanner
.
MUL
:
fallthrough
;
case
Scanner
.
AND
:
func
(
P
*
Parser
)
ParseFuncDecl
()
{
P
.
Trace
(
"FuncDecl"
);
P
.
Expect
(
Scanner
.
FUNC
);
P
.
ParseNamedSignature
();
if
P
.
tok
==
Scanner
.
SEMICOLON
{
// forward declaration
P
.
Next
();
P
.
ParseUnaryExpr
();
P
.
Ecart
();
return
;
}
else
{
P
.
ParseBlock
();
}
P
.
ParsePrimaryExpr
();
P
.
Ecart
();
}
func
Precedence
(
tok
int
)
int
{
// TODO should use a map or array here for lookup
switch
tok
{
case
Scanner
.
LOR
:
return
1
;
case
Scanner
.
LAND
:
return
2
;
case
Scanner
.
EQL
,
Scanner
.
NEQ
,
Scanner
.
LSS
,
Scanner
.
LEQ
,
Scanner
.
GTR
,
Scanner
.
GEQ
:
return
3
;
case
Scanner
.
ADD
,
Scanner
.
SUB
,
Scanner
.
OR
,
Scanner
.
XOR
:
return
4
;
case
Scanner
.
MUL
,
Scanner
.
QUO
,
Scanner
.
REM
,
Scanner
.
SHL
,
Scanner
.
SHR
,
Scanner
.
AND
:
return
5
;
}
return
0
;
}
func
(
P
*
Parser
)
ParseBinaryExpr
(
prec1
int
)
{
P
.
Trace
(
"BinaryExpr"
);
P
.
ParseUnaryExpr
();
for
prec
:=
Precedence
(
P
.
tok
);
prec
>=
prec1
;
prec
--
{
for
Precedence
(
P
.
tok
)
==
prec
{
func
(
P
*
Parser
)
ParseExportDecl
()
{
P
.
Trace
(
"ExportDecl"
);
P
.
Expect
(
Scanner
.
EXPORT
);
if
P
.
tok
==
Scanner
.
LPAREN
{
P
.
Next
();
for
P
.
tok
!=
Scanner
.
RPAREN
{
P
.
ParseIdent
();
P
.
Optional
(
Scanner
.
COMMA
);
// TODO this seems wrong
}
P
.
Next
();
}
else
{
P
.
ParseIdent
();
for
P
.
tok
==
Scanner
.
COMMA
{
P
.
Next
();
P
.
Parse
BinaryExpr
(
prec
+
1
);
P
.
Parse
Ident
(
);
}
}
P
.
Ecart
();
}
func
(
P
*
Parser
)
Parse
Express
ion
()
{
P
.
Trace
(
"
Express
ion"
);
func
(
P
*
Parser
)
Parse
Declarat
ion
()
{
P
.
Trace
(
"
Declarat
ion"
);
indent
:=
P
.
indent
;
P
.
ParseBinaryExpr
(
1
);
switch
P
.
tok
{
case
Scanner
.
CONST
:
P
.
ParseConstDecl
();
case
Scanner
.
TYPE
:
P
.
ParseTypeDecl
();
case
Scanner
.
VAR
:
P
.
ParseVarDecl
();
case
Scanner
.
FUNC
:
P
.
ParseFuncDecl
();
case
Scanner
.
EXPORT
:
P
.
ParseExportDecl
();
default
:
P
.
Error
(
P
.
beg
,
"declaration expected"
);
}
if
indent
!=
P
.
indent
{
panic
"imbalanced tracing code"
;
panic
"imbalanced tracing code"
}
P
.
Ecart
();
}
// ----------------------------------------------------------------------------
// Program
func
(
P
*
Parser
)
ParseProgram
()
{
P
.
Trace
(
"Program"
);
P
.
OpenScope
();
...
...
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