ext_php_rs/
args.rs

1//! Builder and objects relating to function and method arguments.
2
3use std::{ffi::CString, ptr};
4
5use crate::{
6    convert::{FromZvalMut, IntoZvalDyn},
7    describe::{abi, Parameter},
8    error::{Error, Result},
9    ffi::{
10        _zend_expected_type, _zend_expected_type_Z_EXPECTED_ARRAY,
11        _zend_expected_type_Z_EXPECTED_BOOL, _zend_expected_type_Z_EXPECTED_DOUBLE,
12        _zend_expected_type_Z_EXPECTED_LONG, _zend_expected_type_Z_EXPECTED_OBJECT,
13        _zend_expected_type_Z_EXPECTED_RESOURCE, _zend_expected_type_Z_EXPECTED_STRING,
14        zend_internal_arg_info, zend_wrong_parameters_count_error,
15    },
16    flags::DataType,
17    types::Zval,
18    zend::ZendType,
19};
20
21/// Represents an argument to a function.
22#[must_use]
23#[derive(Debug)]
24pub struct Arg<'a> {
25    name: String,
26    r#type: DataType,
27    as_ref: bool,
28    allow_null: bool,
29    pub(crate) variadic: bool,
30    default_value: Option<String>,
31    zval: Option<&'a mut Zval>,
32    variadic_zvals: Vec<Option<&'a mut Zval>>,
33}
34
35impl<'a> Arg<'a> {
36    /// Creates a new argument.
37    ///
38    /// # Parameters
39    ///
40    /// * `name` - The name of the parameter.
41    /// * `_type` - The type of the parameter.
42    pub fn new<T: Into<String>>(name: T, r#type: DataType) -> Self {
43        Arg {
44            name: name.into(),
45            r#type,
46            as_ref: false,
47            allow_null: false,
48            variadic: false,
49            default_value: None,
50            zval: None,
51            variadic_zvals: vec![],
52        }
53    }
54
55    /// Sets the argument as a reference.
56    #[allow(clippy::wrong_self_convention)]
57    pub fn as_ref(mut self) -> Self {
58        self.as_ref = true;
59        self
60    }
61
62    /// Sets the argument as variadic.
63    pub fn is_variadic(mut self) -> Self {
64        self.variadic = true;
65        self
66    }
67
68    /// Sets the argument as nullable.
69    pub fn allow_null(mut self) -> Self {
70        self.allow_null = true;
71        self
72    }
73
74    /// Sets the default value for the argument.
75    pub fn default<T: Into<String>>(mut self, default: T) -> Self {
76        self.default_value = Some(default.into());
77        self
78    }
79
80    /// Attempts to consume the argument, converting the inner type into `T`.
81    /// Upon success, the result is returned in a [`Result`].
82    ///
83    /// As this function consumes, it cannot return a reference to the
84    /// underlying zval.
85    ///
86    /// # Errors
87    ///
88    /// If the conversion fails (or the argument contains no value), the
89    /// argument is returned in an [`Err`] variant.
90    pub fn consume<T>(mut self) -> Result<T, Self>
91    where
92        for<'b> T: FromZvalMut<'b>,
93    {
94        self.zval
95            .as_mut()
96            .and_then(|zv| T::from_zval_mut(zv.dereference_mut()))
97            .ok_or(self)
98    }
99
100    /// Attempts to retrieve the value of the argument.
101    /// This will be None until the [`ArgParser`] is used to parse
102    /// the arguments.
103    pub fn val<T>(&'a mut self) -> Option<T>
104    where
105        T: FromZvalMut<'a>,
106    {
107        self.zval
108            .as_mut()
109            .and_then(|zv| T::from_zval_mut(zv.dereference_mut()))
110    }
111
112    /// Retrice all the variadic values for this Rust argument.
113    pub fn variadic_vals<T>(&'a mut self) -> Vec<T>
114    where
115        T: FromZvalMut<'a>,
116    {
117        self.variadic_zvals
118            .iter_mut()
119            .filter_map(|zv| zv.as_mut())
120            .filter_map(|zv| T::from_zval_mut(zv.dereference_mut()))
121            .collect()
122    }
123
124    /// Attempts to return a reference to the arguments internal Zval.
125    ///
126    /// # Returns
127    ///
128    /// * `Some(&Zval)` - The internal zval.
129    /// * `None` - The argument was empty.
130    // TODO: Figure out if we can change this
131    #[allow(clippy::mut_mut)]
132    pub fn zval(&mut self) -> Option<&mut &'a mut Zval> {
133        self.zval.as_mut()
134    }
135
136    /// Attempts to call the argument as a callable with a list of arguments to
137    /// pass to the function. Note that a thrown exception inside the
138    /// callable is not detectable, therefore you should check if the return
139    /// value is valid rather than unwrapping. Returns a result containing the
140    /// return value of the function, or an error.
141    ///
142    /// You should not call this function directly, rather through the
143    /// [`call_user_func`](crate::call_user_func) macro.
144    ///
145    /// # Parameters
146    ///
147    /// * `params` - A list of parameters to call the function with.
148    ///
149    /// # Errors
150    ///
151    /// * `Error::Callable` - The argument is not callable.
152    // TODO: Measure this
153    #[allow(clippy::inline_always)]
154    #[inline(always)]
155    pub fn try_call(&self, params: Vec<&dyn IntoZvalDyn>) -> Result<Zval> {
156        self.zval.as_ref().ok_or(Error::Callable)?.try_call(params)
157    }
158
159    /// Returns the internal PHP argument info.
160    pub(crate) fn as_arg_info(&self) -> Result<ArgInfo> {
161        Ok(ArgInfo {
162            name: CString::new(self.name.as_str())?.into_raw(),
163            type_: ZendType::empty_from_type(
164                self.r#type,
165                self.as_ref,
166                self.variadic,
167                self.allow_null,
168            )
169            .ok_or(Error::InvalidCString)?,
170            default_value: match &self.default_value {
171                Some(val) if val.as_str() == "None" => CString::new("null")?.into_raw(),
172                Some(val) => CString::new(val.as_str())?.into_raw(),
173                None => ptr::null(),
174            },
175        })
176    }
177}
178
179impl From<Arg<'_>> for _zend_expected_type {
180    fn from(arg: Arg) -> Self {
181        let type_id = match arg.r#type {
182            DataType::False | DataType::True => _zend_expected_type_Z_EXPECTED_BOOL,
183            DataType::Long => _zend_expected_type_Z_EXPECTED_LONG,
184            DataType::Double => _zend_expected_type_Z_EXPECTED_DOUBLE,
185            DataType::String => _zend_expected_type_Z_EXPECTED_STRING,
186            DataType::Array => _zend_expected_type_Z_EXPECTED_ARRAY,
187            DataType::Object(_) => _zend_expected_type_Z_EXPECTED_OBJECT,
188            DataType::Resource => _zend_expected_type_Z_EXPECTED_RESOURCE,
189            _ => unreachable!(),
190        };
191
192        if arg.allow_null {
193            type_id + 1
194        } else {
195            type_id
196        }
197    }
198}
199
200impl From<Arg<'_>> for Parameter {
201    fn from(val: Arg<'_>) -> Self {
202        Parameter {
203            name: val.name.into(),
204            ty: Some(val.r#type).into(),
205            nullable: val.allow_null,
206            default: val.default_value.map(abi::RString::from).into(),
207        }
208    }
209}
210
211/// Internal argument information used by Zend.
212pub type ArgInfo = zend_internal_arg_info;
213
214/// Parses the arguments of a function.
215#[must_use]
216pub struct ArgParser<'a, 'b> {
217    args: Vec<&'b mut Arg<'a>>,
218    min_num_args: Option<usize>,
219    arg_zvals: Vec<Option<&'a mut Zval>>,
220}
221
222impl<'a, 'b> ArgParser<'a, 'b> {
223    /// Builds a new function argument parser.
224    pub fn new(arg_zvals: Vec<Option<&'a mut Zval>>) -> Self {
225        ArgParser {
226            args: vec![],
227            min_num_args: None,
228            arg_zvals,
229        }
230    }
231
232    /// Adds a new argument to the parser.
233    ///
234    /// # Parameters
235    ///
236    /// * `arg` - The argument to add to the parser.
237    pub fn arg(mut self, arg: &'b mut Arg<'a>) -> Self {
238        self.args.push(arg);
239        self
240    }
241
242    /// Sets the next arguments to be added as not required.
243    pub fn not_required(mut self) -> Self {
244        self.min_num_args = Some(self.args.len());
245        self
246    }
247
248    /// Uses the argument parser to parse the arguments contained in the given
249    /// `ExecuteData` object. Returns successfully if the arguments were
250    /// parsed.
251    ///
252    /// This function can only be safely called from within an exported PHP
253    /// function.
254    ///
255    /// # Parameters
256    ///
257    /// * `execute_data` - The execution data from the function.
258    ///
259    /// # Errors
260    ///
261    /// Returns an [`Error`] type if there were too many or too little arguments
262    /// passed to the function. The user has already been notified so you
263    /// should break execution after seeing an error type.
264    ///
265    /// Also returns an error if the number of min/max arguments exceeds
266    /// `u32::MAX`
267    pub fn parse(mut self) -> Result<()> {
268        let max_num_args = self.args.len();
269        let mut min_num_args = self.min_num_args.unwrap_or(max_num_args);
270        let num_args = self.arg_zvals.len();
271        let has_variadic = self.args.last().is_some_and(|arg| arg.variadic);
272        if has_variadic {
273            min_num_args = min_num_args.saturating_sub(1);
274        }
275
276        if num_args < min_num_args || (!has_variadic && num_args > max_num_args) {
277            // SAFETY: Exported C function is safe, return value is unused and parameters
278            // are copied.
279            unsafe {
280                zend_wrong_parameters_count_error(
281                    min_num_args.try_into()?,
282                    max_num_args.try_into()?,
283                );
284            };
285            return Err(Error::IncorrectArguments(num_args, min_num_args));
286        }
287
288        for (i, arg_zval) in self.arg_zvals.into_iter().enumerate() {
289            let arg = match self.args.get_mut(i) {
290                Some(arg) => Some(arg),
291                // Only select the last item if it's variadic
292                None => self.args.last_mut().filter(|arg| arg.variadic),
293            };
294            if let Some(arg) = arg {
295                if arg.variadic {
296                    arg.variadic_zvals.push(arg_zval);
297                } else {
298                    arg.zval = arg_zval;
299                }
300            }
301        }
302
303        Ok(())
304    }
305}
306
307#[cfg(test)]
308mod tests {
309    #![allow(clippy::unwrap_used)]
310    #[cfg(feature = "embed")]
311    use crate::embed::Embed;
312
313    use super::*;
314
315    #[test]
316    fn test_new() {
317        let arg = Arg::new("test", DataType::Long);
318        assert_eq!(arg.name, "test");
319        assert_eq!(arg.r#type, DataType::Long);
320        assert!(!arg.as_ref);
321        assert!(!arg.allow_null);
322        assert!(!arg.variadic);
323        assert!(arg.default_value.is_none());
324        assert!(arg.zval.is_none());
325        assert!(arg.variadic_zvals.is_empty());
326    }
327
328    #[test]
329    fn test_as_ref() {
330        let arg = Arg::new("test", DataType::Long).as_ref();
331        assert!(arg.as_ref);
332    }
333
334    #[test]
335    fn test_is_variadic() {
336        let arg = Arg::new("test", DataType::Long).is_variadic();
337        assert!(arg.variadic);
338    }
339
340    #[test]
341    fn test_allow_null() {
342        let arg = Arg::new("test", DataType::Long).allow_null();
343        assert!(arg.allow_null);
344    }
345
346    #[test]
347    fn test_default() {
348        let arg = Arg::new("test", DataType::Long).default("default");
349        assert_eq!(arg.default_value, Some("default".to_string()));
350
351        // TODO: Validate type
352    }
353
354    #[test]
355    fn test_consume_no_value() {
356        let arg = Arg::new("test", DataType::Long);
357        let result: Result<i32, _> = arg.consume();
358        assert!(result.is_err());
359        assert_eq!(result.unwrap_err().name, "test");
360    }
361
362    #[test]
363    #[cfg(feature = "embed")]
364    fn test_consume() {
365        let mut arg = Arg::new("test", DataType::Long);
366        let mut zval = Zval::from(42);
367        arg.zval = Some(&mut zval);
368
369        let result: Result<i32, _> = arg.consume();
370        assert_eq!(result.unwrap(), 42);
371    }
372
373    #[test]
374    fn test_val_no_value() {
375        let mut arg = Arg::new("test", DataType::Long);
376        let result: Option<i32> = arg.val();
377        assert!(result.is_none());
378    }
379
380    #[test]
381    #[cfg(feature = "embed")]
382    fn test_val() {
383        let mut arg = Arg::new("test", DataType::Long);
384        let mut zval = Zval::from(42);
385        arg.zval = Some(&mut zval);
386
387        let result: Option<i32> = arg.val();
388        assert_eq!(result.unwrap(), 42);
389    }
390
391    #[test]
392    #[cfg(feature = "embed")]
393    fn test_variadic_vals() {
394        let mut arg = Arg::new("test", DataType::Long).is_variadic();
395        let mut zval1 = Zval::from(42);
396        let mut zval2 = Zval::from(43);
397        arg.variadic_zvals.push(Some(&mut zval1));
398        arg.variadic_zvals.push(Some(&mut zval2));
399
400        let result: Vec<i32> = arg.variadic_vals();
401        assert_eq!(result, vec![42, 43]);
402    }
403
404    #[test]
405    fn test_zval_no_value() {
406        let mut arg = Arg::new("test", DataType::Long);
407        let result = arg.zval();
408        assert!(result.is_none());
409    }
410
411    #[test]
412    #[cfg(feature = "embed")]
413    fn test_zval() {
414        let mut arg = Arg::new("test", DataType::Long);
415        let mut zval = Zval::from(42);
416        arg.zval = Some(&mut zval);
417
418        let result = arg.zval();
419        assert!(result.is_some());
420        assert_eq!(result.unwrap().dereference_mut().long(), Some(42));
421    }
422
423    #[test]
424    fn test_try_call_no_value() {
425        let arg = Arg::new("test", DataType::Long);
426        let result = arg.try_call(vec![]);
427        assert!(result.is_err());
428    }
429
430    #[test]
431    #[cfg(feature = "embed")]
432    fn test_try_call_not_callable() {
433        Embed::run(|| {
434            let mut arg = Arg::new("test", DataType::Long);
435            let mut zval = Zval::from(42);
436            arg.zval = Some(&mut zval);
437
438            let result = arg.try_call(vec![]);
439            assert!(result.is_err());
440        });
441    }
442
443    // TODO: Test the callable case
444
445    #[test]
446    #[cfg(feature = "embed")]
447    fn test_as_arg_info() {
448        let arg = Arg::new("test", DataType::Long);
449        let arg_info = arg.as_arg_info();
450        assert!(arg_info.is_ok());
451
452        let arg_info = arg_info.unwrap();
453        assert!(arg_info.default_value.is_null());
454
455        let r#type = arg_info.type_;
456        assert_eq!(r#type.type_mask, 16);
457    }
458
459    #[test]
460    #[cfg(feature = "embed")]
461    fn test_as_arg_info_with_default() {
462        let arg = Arg::new("test", DataType::Long).default("default");
463        let arg_info = arg.as_arg_info();
464        assert!(arg_info.is_ok());
465
466        let arg_info = arg_info.unwrap();
467        assert!(!arg_info.default_value.is_null());
468
469        let r#type = arg_info.type_;
470        assert_eq!(r#type.type_mask, 16);
471    }
472
473    #[test]
474    fn test_type_from_arg() {
475        let arg = Arg::new("test", DataType::Long);
476        let actual: _zend_expected_type = arg.into();
477        assert_eq!(actual, 0);
478
479        let arg = Arg::new("test", DataType::Long).allow_null();
480        let actual: _zend_expected_type = arg.into();
481        assert_eq!(actual, 1);
482
483        let arg = Arg::new("test", DataType::False);
484        let actual: _zend_expected_type = arg.into();
485        assert_eq!(actual, 2);
486
487        let arg = Arg::new("test", DataType::False).allow_null();
488        let actual: _zend_expected_type = arg.into();
489        assert_eq!(actual, 3);
490
491        let arg = Arg::new("test", DataType::True);
492        let actual: _zend_expected_type = arg.into();
493        assert_eq!(actual, 2);
494
495        let arg = Arg::new("test", DataType::True).allow_null();
496        let actual: _zend_expected_type = arg.into();
497        assert_eq!(actual, 3);
498
499        let arg = Arg::new("test", DataType::String);
500        let actual: _zend_expected_type = arg.into();
501        assert_eq!(actual, 4);
502
503        let arg = Arg::new("test", DataType::String).allow_null();
504        let actual: _zend_expected_type = arg.into();
505        assert_eq!(actual, 5);
506
507        let arg = Arg::new("test", DataType::Array);
508        let actual: _zend_expected_type = arg.into();
509        assert_eq!(actual, 6);
510
511        let arg = Arg::new("test", DataType::Array).allow_null();
512        let actual: _zend_expected_type = arg.into();
513        assert_eq!(actual, 7);
514
515        let arg = Arg::new("test", DataType::Resource);
516        let actual: _zend_expected_type = arg.into();
517        assert_eq!(actual, 14);
518
519        let arg = Arg::new("test", DataType::Resource).allow_null();
520        let actual: _zend_expected_type = arg.into();
521        assert_eq!(actual, 15);
522
523        let arg = Arg::new("test", DataType::Object(None));
524        let actual: _zend_expected_type = arg.into();
525        assert_eq!(actual, 18);
526
527        let arg = Arg::new("test", DataType::Object(None)).allow_null();
528        let actual: _zend_expected_type = arg.into();
529        assert_eq!(actual, 19);
530
531        let arg = Arg::new("test", DataType::Double);
532        let actual: _zend_expected_type = arg.into();
533        assert_eq!(actual, 20);
534
535        let arg = Arg::new("test", DataType::Double).allow_null();
536        let actual: _zend_expected_type = arg.into();
537        assert_eq!(actual, 21);
538    }
539
540    #[test]
541    fn test_param_from_arg() {
542        let arg = Arg::new("test", DataType::Long)
543            .default("default")
544            .allow_null();
545        let param: Parameter = arg.into();
546        assert_eq!(param.name, "test".into());
547        assert_eq!(param.ty, abi::Option::Some(DataType::Long));
548        assert!(param.nullable);
549        assert_eq!(param.default, abi::Option::Some("default".into()));
550    }
551
552    #[test]
553    fn test_arg_parser_new() {
554        let arg_zvals = vec![None, None];
555        let parser = ArgParser::new(arg_zvals);
556        assert_eq!(parser.arg_zvals.len(), 2);
557        assert!(parser.args.is_empty());
558        assert!(parser.min_num_args.is_none());
559    }
560
561    #[test]
562    fn test_arg_parser_arg() {
563        let arg_zvals = vec![None, None];
564        let mut parser = ArgParser::new(arg_zvals);
565        let mut arg = Arg::new("test", DataType::Long);
566        parser = parser.arg(&mut arg);
567        assert_eq!(parser.args.len(), 1);
568        assert_eq!(parser.args[0].name, "test");
569        assert_eq!(parser.args[0].r#type, DataType::Long);
570    }
571
572    // TODO: test parse
573}
ext_php_rs/args.rs

ext_php_rs/
args.rs
