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Nasal-Interpreter
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update

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Valk Richard Li 2020-01-02 15:23:49 +08:00 committed by GitHub
parent a4eefdc191
commit 98c58c4680
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1 changed files with 61 additions and 28 deletions
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version2.0/parse.bnf
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@ -4,36 +4,69 @@
# | or
# ::= is defined as
<number> ::= <token_type_number>
<string> ::= <token_type_string>
<id> ::= <token_type_identifier>
<dynamic_id> ::= <token_type_dynamic_id>
<vector> ::= <[> { <scalar> <,> } <]>
<hash> ::= <{> { ( <id> ) | ( <string> ) <:> <scalar> <,> } <}>
<number> ::= <token_number>
<string> ::= <token_string>
<id> ::= <token_identifier>
<dynamic_id> ::= <token_dynamic_id>
<scalar> ::=
<function> ::=<func> [ <(> { ( <id> [ <=> <scalar> ] ) | ( <dynamic_id> ) <,> } <)> ] ( <statement> ) | ( <{> { <statement> <;> } <}> )
<calculation> ::=
<calculation_expr> ::=
<or_expr> {<and> <or_expr>}
<or_expr> ::=
<unary_expr> {<or> <unary_expr>}
| <unary_expr> {<or> <additive_expr>}
| <additive_expr> {<or> <unary_expr>}
| <additive_expr> {<or> <additive_expr>}
<unary_expr> ::=
<-> <additive_expr>
| <!> <additive_expr>
<additive_expr> ::=
<multive_expr> {<+> <multive_expr>}
| <multive_expr> {<-> <multive_expr>}
| <multive_expr> {<~> <multive_expr>}
<multive_expr> ::=
<scalar> {<*> <scalar>}
| <scalar> {</> <scalar>}
<definition> ::=
<var> <id> <=> <scalar>
| <var> <(> <id> { <,> <id> } <)> <=> <scalar>
| <(> <var> <id> { <,> <id> } <) <=> <scalar>
<loop_expr> ::=
<for_loop>
| <while_loop>
| <forindex_loop>
| <foreach_loop>
<for_loop> ::=
<for> <(> [<statement>] <;> [<scalar>] <;> <statement> <)> <statement> [<;>]
| <for> <(> [<statement>] <;> [<scalar>] <;> <statement> <)> <{> {<statement> <;>} <}>
<while_loop> ::=
<while> <(> <scalar> <)> <statement> [<;>]
| <while> <(> <scalar> <) <{> {<statement> <;>} <}>
<forindex_loop> ::=
<forindex> <(> [<statement] <;> [<scalar>] <)> <statement> [<;>]
| <forindex> <(> [<statement] <;> [<scalar>] <) <{> {<statement> <;>} <}>
<foreach_loop> ::=
<foreach> <(> [<statement] <;> [<scalar>] <)> <statement> [<;>]
| <foreach> <(> [<statement] <;> [<scalar>] <) <{> {<statement> <;>} <}>
<assignment> ::=
<if-else> ::=
<if> <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
{ ( <elsif> ) | ( <else> <if> ) } <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
[<else> ( <statement> ) | ( <{> { <statement> <;> } <}> )
<loop> ::=
<for> <(> <;> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <foreach> <(> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <forindex> <(> <;> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
| <while> <(> <scalar> <)> ( <statement> ) | ( <{> { <statement> <;> } <}> )
<choose_expr> ::= <choose_expr_if> {<choose_expr_elsif>} [<choose_expr_else>]
<choose_expr_if> ::=
<if> <(> <scalar> <)> <statement> [<;>]
| <if> <(> <scalar> <)> <{> {<statement> <;>} <}>
<choose_expr_elsif> ::=
<elsif> <(> <scalar> <)> <statement> [<;>]
| <elsif> <(> <scalar> <)> <{> {<statement> <;>} <}>
| <else> <if> <(> <scalar> <)> <statement> [<;>]
| <else> <if> <(> <scalar> <)> <{> {<statement> <;>} <}>
<choose_expr_else> ::=
<else> <statement> [<;>]
| <else> {<statement> <;>} <}>
<continue_expr> ::= <continue>
<break_expr> ::= <break>
<return_expr> ::= <return> [<scalar>]
<statement> ::=
<definition>
| <assignment>
| <if-else>
| <loop>
| <scalar>
<definition>
| <assignment>
| <choose_expr>
| <loop_expr>
| <continue_expr>
| <break_expr>
| <return_expr>