151 lines
4.4 KiB
Rust
151 lines
4.4 KiB
Rust
use crate::{
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AsGrammar, GbnfComplex, GbnfField, GbnfFieldType, GbnfLimit, GbnfPrimitive, GbnfRule,
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GbnfRuleLevel, GbnfToken,
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};
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use itertools::Itertools;
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#[derive(Debug, Clone)]
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pub struct LimitedGbnfComplex<'a> {
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pub complex: &'a GbnfComplex,
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pub limit: &'a GbnfLimit,
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}
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impl AsGrammar for LimitedGbnfComplex<'_> {
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fn rule(&self, token: &str) -> GbnfRule {
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let mut main_rule = self.complex.rule_for_self(token, Some(self.limit));
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let field_rules = self.complex.rules_for_fields(Some(self.limit));
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main_rule.dependents = field_rules;
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main_rule.dependents.push(GbnfRule::space());
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main_rule
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}
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fn base_type_token(&self) -> GbnfToken {
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GbnfToken::new(format!("{}Limit", self.complex.base_type_token()))
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}
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fn with_limit<'a>(&'a self, _: Option<&'a GbnfLimit>) -> impl AsGrammar + 'a {
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self.clone()
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}
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}
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#[derive(Debug, Clone)]
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pub struct LimitedGbnfPrimitive<'a> {
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primitive: GbnfPrimitive,
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values: &'a [String],
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}
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impl LimitedGbnfPrimitive<'_> {
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pub fn new(limit: &GbnfLimit) -> Option<LimitedGbnfPrimitive> {
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if let GbnfLimit::Simple(primitive, values) = limit {
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Some(LimitedGbnfPrimitive {
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primitive: *primitive,
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values,
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})
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} else {
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None
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}
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}
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}
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impl AsGrammar for LimitedGbnfPrimitive<'_> {
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fn rule(&self, token: &str) -> GbnfRule {
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let values = self
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.values
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.into_iter()
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.map(|v| {
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if self.primitive == GbnfPrimitive::String {
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format!(r#""\"{}\"""#, v)
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} else {
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format!(r#""{}""#, v)
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}
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})
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.join(" | ");
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GbnfRule::new(token.into(), values, GbnfRuleLevel::Leaf)
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}
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fn base_type_token(&self) -> GbnfToken {
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GbnfToken::new(format!("{}Limit", self.primitive.base_type_token()))
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}
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fn with_limit<'a>(&'a self, _: Option<&'a GbnfLimit>) -> impl AsGrammar + 'a {
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self.clone()
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}
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}
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#[derive(Debug, Clone)]
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pub struct LimitedGbnfField<'a> {
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pub field: &'a GbnfField,
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pub limit: &'a GbnfLimit,
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}
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macro_rules! wrap_in_limit {
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($field:expr, $limit:expr, $token:expr) => {
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$field.with_limit($limit).rule($token)
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};
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}
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impl AsGrammar for LimitedGbnfField<'_> {
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fn rule(&self, token: &str) -> GbnfRule {
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// This is always the limit for this specific field.
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let limit = Some(self.limit);
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match &self.field.field_type {
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GbnfFieldType::Complex(f) => wrap_in_limit!(f, limit, token),
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GbnfFieldType::Primitive(f) => wrap_in_limit!(f, limit, token),
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GbnfFieldType::OptionalComplex(f) => wrap_in_limit!(f, limit, token).to_optional(),
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GbnfFieldType::OptionalPrimitive(f) => wrap_in_limit!(f, limit, token).to_optional(),
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GbnfFieldType::ComplexList(f) => wrap_in_limit!(f, limit, token).to_list(),
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GbnfFieldType::PrimitiveList(f) => wrap_in_limit!(f, limit, token).to_list(),
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}
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}
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fn base_type_token(&self) -> GbnfToken {
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let token = match &self.field.field_type {
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GbnfFieldType::Primitive(f) => f.base_type_token(),
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GbnfFieldType::Complex(f) => f.base_type_token(),
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GbnfFieldType::OptionalPrimitive(f) => f.base_type_token(),
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GbnfFieldType::OptionalComplex(f) => f.base_type_token(),
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GbnfFieldType::PrimitiveList(f) => f.base_type_token(),
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GbnfFieldType::ComplexList(f) => f.base_type_token(),
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};
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GbnfToken::new(format!("{}{}Limit", self.field.field_name, token))
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}
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fn with_limit<'a>(&'a self, _: Option<&'a GbnfLimit>) -> impl AsGrammar + 'a {
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self.clone()
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}
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}
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#[derive(Debug, Clone)]
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pub struct Limited<'a, T, L>(pub &'a T, pub Option<L>)
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where
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T: AsGrammar + Clone,
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L: AsGrammar + Clone;
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impl<T, L> AsGrammar for Limited<'_, T, L>
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where
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T: AsGrammar + Clone,
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L: AsGrammar + Clone,
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{
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fn rule(&self, token: &str) -> GbnfRule {
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self.1
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.as_ref()
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.map(|l| l.rule(token))
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.unwrap_or_else(|| self.0.rule(token))
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}
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fn base_type_token(&self) -> GbnfToken {
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self.1
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.as_ref()
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.map(|l| l.base_type_token())
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.unwrap_or_else(|| self.0.base_type_token())
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}
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fn with_limit<'a>(&'a self, _: Option<&'a GbnfLimit>) -> impl AsGrammar + 'a {
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self.clone()
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}
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}
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