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Implement array/object destructuring (#3305)

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This patch implements the core functionality of destructuring patterns.
Function argument/for in-of pattern are currently unsupported.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2019-11-14 13:49:49 +01:00
committed by Zoltan Herczeg
parent b4b55a67a2
commit 213544ae47
19 changed files with 1628 additions and 177 deletions
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jerry-core/parser/js/js-scanner-internal.h
+52 -3
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@@ -35,12 +35,12 @@ typedef struct
} scanner_source_start_t;
/**
* Descriptor for storing a let/const literal on stack.
* Descriptor for storing a binding literal on stack.
*/
typedef struct
{
lexer_lit_location_t *literal_p; /**< let/const literal */
} scanner_let_const_literal_t;
lexer_lit_location_t *literal_p; /**< binding literal */
} scanner_binding_literal_t;
/**
* Flags for type member of lexer_lit_location_t structure in the literal pool.
@@ -92,6 +92,46 @@ typedef struct
scanner_case_info_t **last_case_p; /**< last case info */
} scanner_switch_statement_t;
#if ENABLED (JERRY_ES2015)
/**
* Types of scanner destructuring bindings.
*/
typedef enum
{
/* Update SCANNER_NEEDS_BINDING_LIST after changing these values. */
SCANNER_BINDING_NONE, /**< not a destructuring binding expression */
SCANNER_BINDING_VAR, /**< destructuring var binding */
SCANNER_BINDING_LET, /**< destructuring let binding */
SCANNER_BINDING_CONST, /**< destructuring const binding */
} scanner_binding_type_t;
/**
* Check whether a binding list is needed for the binding pattern.
*/
#define SCANNER_NEEDS_BINDING_LIST(type) ((type) >= SCANNER_BINDING_LET)
/**
* Scanner binding items for destructuring binding patterns.
*/
typedef struct scanner_binding_item_t
{
struct scanner_binding_item_t *next_p; /**< next binding in the list */
lexer_lit_location_t *literal_p; /**< binding literal */
} scanner_binding_item_t;
/**
* Scanner binding lists for destructuring binding patterns.
*/
typedef struct scanner_binding_list_t
{
struct scanner_binding_list_t *prev_p; /**< prev list */
scanner_binding_item_t *items_p; /**< list of bindings */
bool is_nested; /**< is nested binding declaration */
} scanner_binding_list_t;
#endif /* ENABLED (JERRY_ES2015) */
/**
* Flags for scanner_literal_pool_t structure.
*/
@@ -137,6 +177,10 @@ struct scanner_context_t
#if ENABLED (JERRY_DEBUGGER)
uint8_t debugger_enabled; /**< debugger is enabled */
#endif /* ENABLED (JERRY_DEBUGGER) */
#if ENABLED (JERRY_ES2015)
uint8_t binding_type; /**< current destructuring binding type */
scanner_binding_list_t *active_binding_list_p; /**< currently active binding list */
#endif /* ENABLED (JERRY_ES2015) */
scanner_literal_pool_t *active_literal_pool_p; /**< currently active literal pool */
scanner_switch_statement_t active_switch_statement; /**< currently active switch statement */
scanner_info_t *end_arguments_p; /**< position of end arguments */
@@ -174,6 +218,11 @@ void scanner_detect_invalid_let (parser_context_t *context_p, lexer_lit_location
#endif /* ENABLED (JERRY_ES2015) */
void scanner_detect_eval_call (parser_context_t *context_p, scanner_context_t *scanner_context_p);
#if ENABLED (JERRY_ES2015)
void scanner_push_destructuring_pattern (parser_context_t *context_p, scanner_context_t *scanner_context_p,
uint8_t binding_type, bool is_nested);
void scanner_pop_binding_list (scanner_context_t *scanner_context_p);
#endif /* ENABLED (JERRY_ES2015) */
/**
* @}