mago-syntax 1.0.0-alpha.5

A correct, fast, and memory-efficient PHP syntax implementation, including Lexer, Parser, AST, and utilities for Mago.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

use crate::ast::*;

/// Determine if a statement contains only definitions.
#[inline]
pub fn statement_contains_only_definitions(statement: &Statement) -> bool {
    let (definitions, statements) = get_statement_stats(statement);

    definitions != 0 && statements == 0
}

#[inline]
pub fn statement_sequence_contains_only_definitions(statement: &Sequence<Statement>) -> bool {
    let mut definitions = 0;
    let mut statements = 0;
    for statement in statement.iter() {
        let (def, stmt) = get_statement_stats(statement);

        definitions += def;
        statements += stmt;
    }

    definitions != 0 && statements == 0
}

#[inline]
fn get_statement_stats(statement: &Statement) -> (usize, usize) {
    let mut total_definitions = 0;
    let mut total_statements = 0;

    match &statement {
        Statement::Namespace(namespace) => {
            for statement in namespace.statements().iter() {
                let (definitions, statements) = get_statement_stats(statement);
                total_definitions += definitions;
                total_statements += statements;
            }
        }
        Statement::Block(block) => {
            for statement in block.statements.iter() {
                let (definitions, statements) = get_statement_stats(statement);
                total_definitions += definitions;
                total_statements += statements;
            }
        }
        Statement::Class(_)
        | Statement::Interface(_)
        | Statement::Trait(_)
        | Statement::Enum(_)
        | Statement::Function(_)
        | Statement::Constant(_) => {
            total_definitions += 1;
        }
        _ => {
            total_statements += 1;
        }
    }

    (total_definitions, total_statements)
}