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report malformed int and float patterns

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This commit is contained in:
Folkert 2020-07-04 17:06:27 +02:00
parent a05b664be0
commit 0c7a4179aa
8 changed files with 208 additions and 27 deletions
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71
compiler/can/src/pattern.rs
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@ -5,7 +5,7 @@ use roc_module::ident::{Ident, Lowercase, TagName};
use roc_module::symbol::Symbol;
use roc_parse::ast;
use roc_parse::pattern::PatternType;
use roc_problem::can::{Problem, RuntimeError};
use roc_problem::can::{MalformedPatternProblem, Problem, RuntimeError};
use roc_region::all::{Located, Region};
use roc_types::subs::{VarStore, Variable};
@ -35,6 +35,8 @@ pub enum Pattern {
Shadowed(Region, Located<Ident>),
// Example: (5 = 1 + 2) is an unsupported pattern in an assignment; Int patterns aren't allowed in assignments!
UnsupportedPattern(Region),
// parse error patterns
MalformedPattern(MalformedPatternProblem, Region),
}
#[derive(Clone, Debug, PartialEq)]
@ -76,6 +78,7 @@ pub fn symbols_from_pattern_help(pattern: &Pattern, symbols: &mut Vec<Symbol>) {
| FloatLiteral(_)
| StrLiteral(_)
| Underscore
| MalformedPattern(_, _)
| UnsupportedPattern(_) => {}
Shadowed(_, _) => {}
@ -165,12 +168,13 @@ pub fn canonicalize_pattern<'a>(
}
FloatLiteral(ref string) => match pattern_type {
WhenBranch => {
let float = finish_parsing_float(string)
.unwrap_or_else(|_| panic!("TODO handle malformed float pattern"));
Pattern::FloatLiteral(float)
}
WhenBranch => match finish_parsing_float(string) {
Err(_error) => {
let problem = MalformedPatternProblem::MalformedFloat;
malformed_pattern(env, problem, region)
}
Ok(float) => Pattern::FloatLiteral(float),
},
ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
unsupported_pattern(env, ptype, region)
}
@ -182,12 +186,13 @@ pub fn canonicalize_pattern<'a>(
},
NumLiteral(string) => match pattern_type {
WhenBranch => {
let int = finish_parsing_int(string)
.unwrap_or_else(|_| panic!("TODO handle malformed int pattern"));
Pattern::NumLiteral(var_store.fresh(), int)
}
WhenBranch => match finish_parsing_int(string) {
Err(_error) => {
let problem = MalformedPatternProblem::MalformedInt;
malformed_pattern(env, problem, region)
}
Ok(int) => Pattern::NumLiteral(var_store.fresh(), int),
},
ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
unsupported_pattern(env, ptype, region)
}
@ -198,16 +203,19 @@ pub fn canonicalize_pattern<'a>(
base,
is_negative,
} => match pattern_type {
WhenBranch => {
let int = finish_parsing_base(string, *base)
.unwrap_or_else(|_| panic!("TODO handle malformed {:?} pattern", base));
if *is_negative {
Pattern::IntLiteral(-int)
} else {
Pattern::IntLiteral(int)
WhenBranch => match finish_parsing_base(string, *base) {
Err(_error) => {
let problem = MalformedPatternProblem::MalformedBase(*base);
malformed_pattern(env, problem, region)
}
}
Ok(int) => {
if *is_negative {
Pattern::IntLiteral(-int)
} else {
Pattern::IntLiteral(int)
}
}
},
ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
unsupported_pattern(env, ptype, region)
}
@ -215,8 +223,8 @@ pub fn canonicalize_pattern<'a>(
StrLiteral(_string) => match pattern_type {
WhenBranch => {
panic!("TODO check whether string pattern is malformed.");
// Pattern::StrLiteral((*string).into())
// TODO report whether string was malformed
Pattern::StrLiteral((*string).into())
}
ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
unsupported_pattern(env, ptype, region)
@ -325,6 +333,20 @@ fn unsupported_pattern<'a>(
Pattern::UnsupportedPattern(region)
}
/// When we detect a malformed pattern like `3.X` or `0b5`,
/// report it to Env and return an UnsupportedPattern runtime error pattern.
fn malformed_pattern<'a>(
env: &mut Env<'a>,
problem: MalformedPatternProblem,
region: Region,
) -> Pattern {
env.problem(Problem::RuntimeError(RuntimeError::MalformedPattern(
problem, region,
)));
Pattern::MalformedPattern(problem, region)
}
pub fn bindings_from_patterns<'a, I>(loc_patterns: I, scope: &Scope) -> Vec<(Symbol, Region)>
where
I: Iterator<Item = &'a Located<Pattern>>,
@ -374,6 +396,7 @@ fn add_bindings_from_patterns(
| StrLiteral(_)
| Underscore
| Shadowed(_, _)
| MalformedPattern(_, _)
| UnsupportedPattern(_) => (),
}
}