Nasty.Language.Spanish.PhraseParser (Nasty v0.3.0)
View SourcePhrase structure parser for Spanish.
Builds syntactic phrases (NounPhrase, VerbPhrase, etc.) from POS-tagged tokens using bottom-up pattern matching with Spanish word order.
Spanish-Specific Features
- Post-nominal adjectives: "la casa roja" (the red house)
- Pre-nominal quantifiers: "muchos libros" (many books)
- Flexible word order: SVO is default but flexible
- Clitic pronouns: already attached to verbs by tokenizer
Grammar Rules (Simplified CFG)
NP → Det? QuantAdj* Noun Adj* PP*
VP → Aux* MainVerb NP? PP* Adv*
PP → Prep NP
AdjP → Adv? Adj
AdvP → AdvExamples
iex> tokens = [
...> %Token{text: "la", pos_tag: :det},
...> %Token{text: "casa", pos_tag: :noun},
...> %Token{text: "roja", pos_tag: :adj}
...> ]
iex> PhraseParser.parse_noun_phrase(tokens, 0)
{:ok, noun_phrase, 3} # Consumed 3 tokensSummary
Functions
Parses a Spanish adjectival phrase starting at the given position.
Parses a Spanish adverbial phrase (simple adverb for now).
Parses a Spanish noun phrase starting at the given position.
Parses a Spanish prepositional phrase starting at the given position.
Parses a Spanish relative clause starting at the given position.
Parses a Spanish verb phrase starting at the given position.
Functions
@spec parse_adjectival_phrase([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.AdjectivalPhrase.t(), non_neg_integer()} | :error
Parses a Spanish adjectival phrase starting at the given position.
Grammar: Adv? Adj
Examples: "muy bonita" (very pretty), "bastante grande" (quite big)
Returns {:ok, adj_phrase, next_pos} or :error
@spec parse_adverbial_phrase([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.AdverbialPhrase.t(), non_neg_integer()} | :error
Parses a Spanish adverbial phrase (simple adverb for now).
Grammar: Adv
Returns {:ok, adv_phrase, next_pos} or :error
@spec parse_noun_phrase([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.NounPhrase.t(), non_neg_integer()} | :error
Parses a Spanish noun phrase starting at the given position.
Grammar: Det? QuantAdj (Noun | PropN | Pron) Adj PP*
Spanish adjectives typically come AFTER the noun (post-nominal), but quantifying adjectives come before (e.g., "muchos", "pocos").
Returns {:ok, noun_phrase, next_pos} or :error
@spec parse_prepositional_phrase([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.PrepositionalPhrase.t(), non_neg_integer()} | :error
Parses a Spanish prepositional phrase starting at the given position.
Grammar: Prep NP
Spanish prepositions: a, ante, bajo, con, contra, de, desde, en, entre, hacia, hasta, para, por, según, sin, sobre, tras
Returns {:ok, prep_phrase, next_pos} or :error
@spec parse_relative_clause([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.RelativeClause.t(), non_neg_integer()} | :error
Parses a Spanish relative clause starting at the given position.
Grammar: RelPron/RelAdv Clause
Relative pronouns: que, quien, quienes, cual, cuales, cuyo Relative adverbs: donde, cuando, como
Returns {:ok, relative_clause, next_pos} or :error
@spec parse_verb_phrase([Nasty.AST.Token.t()], non_neg_integer()) :: {:ok, Nasty.AST.VerbPhrase.t(), non_neg_integer()} | :error
Parses a Spanish verb phrase starting at the given position.
Grammar: Aux MainVerb NP? PP Adv*
Spanish verb phrases are similar to English, with:
- Auxiliaries (haber, ser, estar) before main verb
- Object NP after verb
- PPs and adverbs as complements
Returns {:ok, verb_phrase, next_pos} or :error