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py/compile: Implement PEP 526, syntax for variable annotations.

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This addition to the grammar was introduced in Python 3.6.  It allows
annotating the type of a varilable, like:

    x: int = 123
    s: str

The implementation in this commit is quite simple and just ignores the
annotation (the int and str bits above).  The reason to implement this is
to allow Python 3.6+ code that uses this feature to compile under
MicroPython without change, and for users to use type checkers.

In the future viper could use this syntax as a way to give types to
variables, which is currently done in a bit of an ad-hoc way, eg
x = int(123).  And this syntax could potentially be used in the inline
assembler to define labels in an way that's easier to read.
This commit is contained in:
Damien George
2020-06-16 22:49:25 +10:00
parent 131b0de70a
commit f2e267da68
2 changed files with 29 additions and 10 deletions
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8
py/grammar.h
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@@ -98,20 +98,22 @@ DEF_RULE_NC(simple_stmt, and_ident(2), rule(simple_stmt_2), tok(NEWLINE))
DEF_RULE(simple_stmt_2, c(generic_all_nodes), list_with_end, rule(small_stmt), tok(DEL_SEMICOLON))
// small_stmt: expr_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | nonlocal_stmt | assert_stmt
// expr_stmt: testlist_star_expr (augassign (yield_expr|testlist) | ('=' (yield_expr|testlist_star_expr))*)
// expr_stmt: testlist_star_expr (annassign | augassign (yield_expr|testlist) | ('=' (yield_expr|testlist_star_expr))*)
// testlist_star_expr: (test|star_expr) (',' (test|star_expr))* [',']
// annassign: ':' test ['=' (yield_expr|testlist_star_expr)]
// augassign: '+=' | '-=' | '*=' | '@=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' | '//='
// # For normal assignments, additional restrictions enforced by the interpreter
// # For normal and annotated assignments, additional restrictions enforced by the interpreter
DEF_RULE_NC(small_stmt, or(8), rule(del_stmt), rule(pass_stmt), rule(flow_stmt), rule(import_stmt), rule(global_stmt), rule(nonlocal_stmt), rule(assert_stmt), rule(expr_stmt))
DEF_RULE(expr_stmt, c(expr_stmt), and(2), rule(testlist_star_expr), opt_rule(expr_stmt_2))
DEF_RULE_NC(expr_stmt_2, or(2), rule(expr_stmt_augassign), rule(expr_stmt_assign_list))
DEF_RULE_NC(expr_stmt_2, or(3), rule(annassign), rule(expr_stmt_augassign), rule(expr_stmt_assign_list))
DEF_RULE_NC(expr_stmt_augassign, and_ident(2), rule(augassign), rule(expr_stmt_6))
DEF_RULE_NC(expr_stmt_assign_list, one_or_more, rule(expr_stmt_assign))
DEF_RULE_NC(expr_stmt_assign, and_ident(2), tok(DEL_EQUAL), rule(expr_stmt_6))
DEF_RULE_NC(expr_stmt_6, or(2), rule(yield_expr), rule(testlist_star_expr))
DEF_RULE(testlist_star_expr, c(generic_tuple), list_with_end, rule(testlist_star_expr_2), tok(DEL_COMMA))
DEF_RULE_NC(testlist_star_expr_2, or(2), rule(star_expr), rule(test))
DEF_RULE_NC(annassign, and(3), tok(DEL_COLON), rule(test), opt_rule(expr_stmt_assign))
DEF_RULE_NC(augassign, or(13), tok(DEL_PLUS_EQUAL), tok(DEL_MINUS_EQUAL), tok(DEL_STAR_EQUAL), tok(DEL_AT_EQUAL), tok(DEL_SLASH_EQUAL), tok(DEL_PERCENT_EQUAL), tok(DEL_AMPERSAND_EQUAL), tok(DEL_PIPE_EQUAL), tok(DEL_CARET_EQUAL), tok(DEL_DBL_LESS_EQUAL), tok(DEL_DBL_MORE_EQUAL), tok(DEL_DBL_STAR_EQUAL), tok(DEL_DBL_SLASH_EQUAL))
// del_stmt: 'del' exprlist