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fea39723b8
php-parser/parser.y
vadim fea39723b8 parse expressions
2017-11-28 18:00:27 +02:00

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%{
package main
import (
"bytes"
"fmt"
"os"
"io"
)
type node struct {
name string
children []node
attributes map[string]string
}
func (n node) String() string {
buf := new(bytes.Buffer)
n.print(buf, " ")
return buf.String()
}
func (n node) print(out io.Writer, indent string) {
if (len(n.attributes) > 0) {
fmt.Fprintf(out, "\n%v%v %s", indent, n.name, n.attributes)
} else {
fmt.Fprintf(out, "\n%v%v", indent, n.name)
}
for _, nn := range n.children {
nn.print(out, indent + " ")
}
}
func Node(name string) node {
return node{name: name, attributes: make(map[string]string)}
}
func (n node) append(nn...node) node {
n.children = append(n.children, nn...)
return n
}
func (n node) attribute(key string, value string) node {
n.attributes[key] = value
return n
}
%}
%union{
node node
token string
value string
}
%left T_INCLUDE T_INCLUDE_ONCE T_EVAL T_REQUIRE T_REQUIRE_ONCE
%left ','
%left T_LOGICAL_OR
%left T_LOGICAL_XOR
%left T_LOGICAL_AND
%right T_PRINT
%right T_YIELD
%right T_DOUBLE_ARROW
%right T_YIELD_FROM
%left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL T_POW_EQUAL
%left '?' ':'
%right T_COALESCE
%left T_BOOLEAN_OR
%left T_BOOLEAN_AND
%left '|'
%left '^'
%left '&'
%nonassoc T_IS_EQUAL T_IS_NOT_EQUAL T_IS_IDENTICAL T_IS_NOT_IDENTICAL T_SPACESHIP
%nonassoc '<' T_IS_SMALLER_OR_EQUAL '>' T_IS_GREATER_OR_EQUAL
%left T_SL T_SR
%left '+' '-' '.'
%left '*' '/' '%'
%right '!'
%nonassoc T_INSTANCEOF
%right '~' T_INC T_DEC T_INT_CAST T_DOUBLE_CAST T_STRING_CAST T_ARRAY_CAST T_OBJECT_CAST T_BOOL_CAST T_UNSET_CAST '@'
%right T_POW
%right '['
%nonassoc T_NEW T_CLONE
%left T_ELSEIF
%left T_ELSE
%left T_ENDIF
%right T_STATIC T_ABSTRACT T_FINAL T_PRIVATE T_PROTECTED T_PUBLIC
%type <token> $unk
%token <token> T_INCLUDE
%token <token> T_INCLUDE_ONCE
%token <token> T_EXIT
%token <token> T_IF
%token <token> T_LNUMBER
%token <token> T_DNUMBER
%token <token> T_STRING
%token <token> T_STRING_VARNAME
%token <token> T_VARIABLE
%token <token> T_NUM_STRING
%token <token> T_INLINE_HTML
%token <token> T_CHARACTER
%token <token> T_BAD_CHARACTER
%token <token> T_ENCAPSED_AND_WHITESPACE
%token <token> T_CONSTANT_ENCAPSED_STRING
%token <token> T_ECHO
%token <token> T_DO
%token <token> T_WHILE
%token <token> T_ENDWHILE
%token <token> T_FOR
%token <token> T_ENDFOR
%token <token> T_FOREACH
%token <token> T_ENDFOREACH
%token <token> T_DECLARE
%token <token> T_ENDDECLARE
%token <token> T_AS
%token <token> T_SWITCH
%token <token> T_ENDSWITCH
%token <token> T_CASE
%token <token> T_DEFAULT
%token <token> T_BREAK
%token <token> T_CONTINUE
%token <token> T_GOTO
%token <token> T_FUNCTION
%token <token> T_CONST
%token <token> T_RETURN
%token <token> T_TRY
%token <token> T_CATCH
%token <token> T_FINALLY
%token <token> T_THROW
%token <token> T_USE
%token <token> T_INSTEADOF
%token <token> T_GLOBAL
%token <token> T_VAR
%token <token> T_UNSET
%token <token> T_ISSET
%token <token> T_EMPTY
%token <token> T_HALT_COMPILER
%token <token> T_CLASS
%token <token> T_TRAIT
%token <token> T_INTERFACE
%token <token> T_EXTENDS
%token <token> T_IMPLEMENTS
%token <token> T_OBJECT_OPERATOR
%token <token> T_DOUBLE_ARROW
%token <token> T_LIST
%token <token> T_ARRAY
%token <token> T_CALLABLE
%token <token> T_CLASS_C
%token <token> T_TRAIT_C
%token <token> T_METHOD_C
%token <token> T_FUNC_C
%token <token> T_LINE
%token <token> T_FILE
%token <token> T_COMMENT
%token <token> T_DOC_COMMENT
%token <token> T_OPEN_TAG
%token <token> T_OPEN_TAG_WITH_ECHO
%token <token> T_CLOSE_TAG
%token <token> T_WHITESPACE
%token <token> T_START_HEREDOC
%token <token> T_END_HEREDOC
%token <token> T_DOLLAR_OPEN_CURLY_BRACES
%token <token> T_CURLY_OPEN
%token <token> T_PAAMAYIM_NEKUDOTAYIM
%token <token> T_NAMESPACE
%token <token> T_NS_C
%token <token> T_DIR
%token <token> T_NS_SEPARATOR
%token <token> T_ELLIPSIS
%type <value> class_modifier
%type <value> is_reference
%type <value> is_variadic
%type <value> returns_ref
%type <node> identifier
%type <node> top_statement
%type <node> namespace_name
%type <node> namespace_name_parts
%type <node> name
%type <node> top_statement_list
%type <node> statement
%type <node> inner_statement
%type <node> inner_statement_list
%type <node> class_modifiers
%type <node> class_declaration_statement
%type <node> function_declaration_statement
%type <node> optional_type
%type <node> return_type
%type <node> type_expr
%type <node> type
%type <node> parameter_list
%type <node> non_empty_parameter_list
%type <node> parameter
%type <node> expr
%type <node> expr_without_variable
%type <node> callable_variable
%type <node> variable
%type <node> simple_variable
%%
/////////////////////////////////////////////////////////////////////////
start:
top_statement_list { fmt.Println($1) }
;
reserved_non_modifiers:
T_INCLUDE | T_INCLUDE_ONCE | T_EVAL | T_REQUIRE | T_REQUIRE_ONCE | T_LOGICAL_OR | T_LOGICAL_XOR | T_LOGICAL_AND
| T_INSTANCEOF | T_NEW | T_CLONE | T_EXIT | T_IF | T_ELSEIF | T_ELSE | T_ENDIF | T_ECHO | T_DO | T_WHILE | T_ENDWHILE
| T_FOR | T_ENDFOR | T_FOREACH | T_ENDFOREACH | T_DECLARE | T_ENDDECLARE | T_AS | T_TRY | T_CATCH | T_FINALLY
| T_THROW | T_USE | T_INSTEADOF | T_GLOBAL | T_VAR | T_UNSET | T_ISSET | T_EMPTY | T_CONTINUE | T_GOTO
| T_FUNCTION | T_CONST | T_RETURN | T_PRINT | T_YIELD | T_LIST | T_SWITCH | T_ENDSWITCH | T_CASE | T_DEFAULT | T_BREAK
| T_ARRAY | T_CALLABLE | T_EXTENDS | T_IMPLEMENTS | T_NAMESPACE | T_TRAIT | T_INTERFACE | T_CLASS
| T_CLASS_C | T_TRAIT_C | T_FUNC_C | T_METHOD_C | T_LINE | T_FILE | T_DIR | T_NS_C
;
semi_reserved:
reserved_non_modifiers
| T_STATIC | T_ABSTRACT | T_FINAL | T_PRIVATE | T_PROTECTED | T_PUBLIC
;
identifier:
T_STRING { $$ = Node("identifier") }
| semi_reserved { $$ = Node("reserved") }
;
namespace_name_parts:
T_STRING { $$ = Node("NamespaceParts").append(Node($1)) }
| namespace_name_parts T_NS_SEPARATOR T_STRING { $$ = $1.append(Node($3)) }
;
namespace_name:
namespace_name_parts { $$ = $1; }
;
name:
namespace_name { $$ = Node("Name").append($1); }
| T_NS_SEPARATOR namespace_name { $$ = Node("Name").append($2).attribute("FullyQualified", "true"); }
| T_NAMESPACE T_NS_SEPARATOR namespace_name { $$ = Node("Name").append($3).attribute("Relative", "true"); }
;
top_statement_list:
top_statement_list top_statement { $$ = $1.append($2); }
| /* empty */ { $$ = Node("Statements") }
;
top_statement:
statement { $$ = $1 }
| function_declaration_statement { $$ = $1 }
| T_INCLUDE identifier ';' { $$ = $2; /*TODO: identifier stub, refactor it*/ }
| T_NAMESPACE namespace_name ';' { $$ = Node("Namespace").append($2); }
| class_declaration_statement { $$ = $1; }
;
inner_statement_list:
inner_statement_list inner_statement { $$ = $1.append($2); }
| /* empty */ { $$ = Node("statement_list") }
;
inner_statement:
statement { $$ = $1; }
| function_declaration_statement { $$ = $1; }
| class_declaration_statement { $$ = $1; }
statement:
'{' inner_statement_list '}' { $$ = $2; }
| T_DO statement T_WHILE '(' expr ')' ';' { $$ = Node("Do While").append($2).append($5)}
| expr ';' { $$ = $1; }
class_declaration_statement:
class_modifiers T_CLASS T_STRING '{' '}' { $$ = $1.attribute("name", $3) }
| T_CLASS T_STRING '{' '}' { $$ = Node("Class").attribute("name", $2) }
;
class_modifiers:
class_modifier { $$ = Node("Class").attribute($1, "true") }
| class_modifiers class_modifier { $$ = $1.attribute($2, "true") }
;
class_modifier:
T_ABSTRACT { $$ = "abstract" }
| T_FINAL { $$ = "final" }
;
function_declaration_statement:
T_FUNCTION returns_ref T_STRING '(' parameter_list ')' return_type '{' inner_statement_list '}'
{
$$ = Node("Function").
attribute("name", $3).
attribute("returns_ref", $2).
append($5).
append($7).
append($9);
}
;
parameter_list:
non_empty_parameter_list { $$ = $1; }
| /* empty */ { $$ = Node("Parameter list"); }
;
non_empty_parameter_list:
parameter { $$ = Node("Parameter list").append($1) }
| non_empty_parameter_list ',' parameter { $$ = $1.append($3); }
;
parameter:
optional_type is_reference is_variadic T_VARIABLE
{
$$ = Node("Parameter").
append($1).
attribute("is_reference", $2).
attribute("is_variadic", $3).
attribute("var", $4);
}
| optional_type is_reference is_variadic T_VARIABLE '=' expr
{
$$ = Node("Parameter").
append($1).
attribute("is_reference", $2).
attribute("is_variadic", $3).
attribute("var", $4).
append($6);
}
;
optional_type:
/* empty */ { $$ = Node("No type") }
| type_expr { $$ = $1; }
;
returns_ref:
/* empty */ { $$ = "false"; }
| '&' { $$ = "true"; }
;
is_reference:
/* empty */ { $$ = "false"; }
| '&' { $$ = "true"; }
;
is_variadic:
/* empty */ { $$ = "false"; }
| T_ELLIPSIS { $$ = "true"; }
;
type_expr:
type { $$ = $1; }
| '?' type { $$ = $2; $$.attribute("nullable", "true") }
;
type:
name { $$ = $1; }
| T_ARRAY { $$ = Node("array type"); }
| T_CALLABLE { $$ = Node("callable type"); }
;
return_type:
/* empty */ { $$ = Node("void"); }
| ':' type_expr { $$ = $2; }
;
expr_without_variable:
variable '=' expr { $$ = Node("Assign").append($1).append($3); }
| variable '=' '&' expr { $$ = Node("AssignRef").append($1).append($4); }
| variable '=' '&' expr { $$ = Node("AssignRef").append($1).append($4); }
| T_CLONE expr { $$ = Node("Clone").append($2); }
| variable T_PLUS_EQUAL expr { $$ = Node("AssignAdd").append($1).append($3); }
| variable T_MINUS_EQUAL expr { $$ = Node("AssignSub").append($1).append($3); }
| variable T_MUL_EQUAL expr { $$ = Node("AssignMul").append($1).append($3); }
| variable T_POW_EQUAL expr { $$ = Node("AssignPow").append($1).append($3); }
| variable T_DIV_EQUAL expr { $$ = Node("AssignDiv").append($1).append($3); }
| variable T_CONCAT_EQUAL expr { $$ = Node("AssignConcat").append($1).append($3); }
| variable T_MOD_EQUAL expr { $$ = Node("AssignMod").append($1).append($3); }
| variable T_AND_EQUAL expr { $$ = Node("AssignAnd").append($1).append($3); }
| variable T_AND_EQUAL expr { $$ = Node("AssignAnd").append($1).append($3); }
| variable T_OR_EQUAL expr { $$ = Node("AssignOr").append($1).append($3); }
| variable T_XOR_EQUAL expr { $$ = Node("AssignXor").append($1).append($3); }
| variable T_SL_EQUAL expr { $$ = Node("AssignShiftLeft").append($1).append($3); }
| variable T_SR_EQUAL expr { $$ = Node("AssignShiftRight").append($1).append($3); }
| variable T_INC { $$ = Node("PostIncrement").append($1) }
| T_INC variable { $$ = Node("PreIncrement").append($2) }
| variable T_DEC { $$ = Node("PostDecrement").append($1) }
| T_DEC variable { $$ = Node("PreDecrement").append($2) }
| expr T_BOOLEAN_OR expr { $$ = Node("Or").append($1).append($3) }
| expr T_BOOLEAN_AND expr { $$ = Node("And").append($1).append($3) }
| expr T_LOGICAL_OR expr { $$ = Node("Or").append($1).append($3) }
| expr T_LOGICAL_AND expr { $$ = Node("And").append($1).append($3) }
| expr T_LOGICAL_XOR expr { $$ = Node("Xor").append($1).append($3) }
| expr '|' expr { $$ = Node("BitwiseOr").append($1).append($3) }
| expr '&' expr { $$ = Node("BitwiseAnd").append($1).append($3) }
| expr '^' expr { $$ = Node("BitwiseXor").append($1).append($3) }
| expr '.' expr { $$ = Node("Concat").append($1).append($3) }
| expr '+' expr { $$ = Node("Add").append($1).append($3) }
| expr '-' expr { $$ = Node("Sub").append($1).append($3) }
| expr '*' expr { $$ = Node("Mul").append($1).append($3) }
| expr T_POW expr { $$ = Node("Pow").append($1).append($3) }
| expr '/' expr { $$ = Node("Div").append($1).append($3) }
| expr '%' expr { $$ = Node("Mod").append($1).append($3) }
| expr T_SL expr { $$ = Node("ShiftLeft").append($1).append($3) }
| expr T_SR expr { $$ = Node("ShiftRight").append($1).append($3) }
| '+' expr %prec T_INC { $$ = Node("UnaryPlus").append($2) }
| '-' expr %prec T_INC { $$ = Node("UnaryMinus").append($2) }
| '!' expr { $$ = Node("BooleanNot").append($2) }
| '~' expr { $$ = Node("BitwiseNot").append($2) }
| expr T_IS_IDENTICAL expr { $$ = Node("Identical").append($1).append($3) }
| expr T_IS_NOT_IDENTICAL expr { $$ = Node("NotIdentical").append($1).append($3) }
| expr T_IS_EQUAL expr { $$ = Node("Equal").append($1).append($3) }
| expr T_IS_NOT_EQUAL expr { $$ = Node("NotEqual").append($1).append($3) }
| expr T_SPACESHIP expr { $$ = Node("Spaceship").append($1).append($3) }
| expr '<' expr { $$ = Node("Smaller").append($1).append($3) }
| expr T_IS_SMALLER_OR_EQUAL expr { $$ = Node("SmallerOrEqual").append($1).append($3) }
| expr '>' expr { $$ = Node("Greater").append($1).append($3) }
| expr T_IS_GREATER_OR_EQUAL expr { $$ = Node("GreaterOrEqual").append($1).append($3) }
| '(' expr ')' { $$ = $2; }
| expr '?' expr ':' expr { $$ = Node("Ternary").append($1).append($3).append($5); }
| expr '?' ':' expr { $$ = Node("Ternary").append($1).append($4); }
| expr T_COALESCE expr { $$ = Node("Coalesce").append($1).append($3); }
| T_EMPTY '(' expr ')' { $$ = Node("Empty").append($3); }
| T_INCLUDE expr { $$ = Node("Include").append($2); }
| T_INCLUDE_ONCE expr { $$ = Node("IncludeOnce").append($2); }
| T_EVAL '(' expr ')' { $$ = Node("Eval").append($3); }
| T_REQUIRE expr { $$ = Node("Require").append($2); }
| T_REQUIRE_ONCE expr { $$ = Node("RequireOnce").append($2); }
| T_INT_CAST expr { $$ = Node("CastInt").append($2); }
| T_DOUBLE_CAST expr { $$ = Node("CastDouble").append($2); }
| T_STRING_CAST expr { $$ = Node("CastString").append($2); }
| T_ARRAY_CAST expr { $$ = Node("CastArray").append($2); }
| T_OBJECT_CAST expr { $$ = Node("CastObject").append($2); }
| T_BOOL_CAST expr { $$ = Node("CastBool").append($2); }
| T_UNSET_CAST expr { $$ = Node("CastUnset").append($2); }
| '@' expr { $$ = Node("Silence").append($2); }
| T_PRINT expr { $$ = Node("Print").append($2); }
| T_YIELD { $$ = Node("Yield"); }
| T_YIELD expr { $$ = Node("Yield").append($2); }
| T_YIELD expr T_DOUBLE_ARROW expr { $$ = Node("Yield").append($2).append($4); }
| T_YIELD_FROM expr { $$ = Node("YieldFrom").append($2); }
;
expr:
variable { $$ = $1; }
| expr_without_variable { $$ = $1; }
;
callable_variable:
simple_variable { $$ = $1; }
;
variable:
callable_variable { $$ = $1; }
;
simple_variable:
T_VARIABLE { $$ = Node("Variable").attribute("name", $1); }
| '$' '{' expr '}' { $$ = $3; }
| '$' simple_variable { $$ = Node("Variable").append($2); }
;
/////////////////////////////////////////////////////////////////////////
%%
const src = `<?
namespace foo\bar\test;
+$b++;
do {
function test(string $a, \bar\baz $b = $t) {
yield $a => $b;
}
} while($a = $b = $c);
`
func main() {
yyDebug = 0
yyErrorVerbose = true
l := newLexer(bytes.NewBufferString(src), os.Stdout, "file.name")
yyParse(l)
}
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