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WIP to port lisp-parser.dart #2

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e578565
WIP to part lisp-parser.dart
duncanmak Jan 12, 2024
c88bf6c
Make syntax errors in lisp.kt go away
renggli Jan 12, 2024
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71 changes: 71 additions & 0 deletions src/commonTest/kotlin/org/petitparser/grammar/lisp/Lisp.kt
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package org.petitparser.grammar.lisp

import org.petitparser.core.grammar.Grammar
import org.petitparser.core.parser.Parser
import org.petitparser.core.parser.combinator.*
import org.petitparser.core.parser.consumer.CharPredicate.Companion.any
import org.petitparser.core.parser.consumer.CharPredicate.Companion.anyOf
import org.petitparser.core.parser.consumer.CharPredicate.Companion.char
import org.petitparser.core.parser.consumer.CharPredicate.Companion.pattern
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These are predicates, you want the parsers:

import org.petitparser.core.parser.consumer.any
import org.petitparser.core.parser.consumer.anyOf
import org.petitparser.core.parser.consumer.char
import org.petitparser.core.parser.consumer.digit

Possibly PetitParser could reduce their visibility?

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Maybe prefixing the predicates with is, i.e. (isAny, isChar) will help differentiate the two sets?

import org.petitparser.core.parser.consumer.digit
import org.petitparser.core.parser.consumer.newline
import org.petitparser.core.parser.consumer.whitespace
import org.petitparser.core.parser.misc.end
import org.petitparser.core.parser.repeater.star

class LispGrammar : Grammar() {

private val comment by seq(char(';'), newline().not().star())
private val space by or(whitespace(), ref(comment))

private val splice by seq(char('@'), list)
private val unquote by seq(char(','), ref(list))
private val quasiquote by seq(char('`'), ref(list))
private val quote by seq(char('\''), ref(atom))

private val symbolToken by seqMap(
pattern("a-zA-Z!#\$%&*/:<=>?@\\^_|~+-"),
pattern("a-zA-Z0-9!#\$%&*/:<=>?@\\^_|~+-")).star()
private val symbol = symbolToken.flatten("Symbol expected")

private val characterRaw = pattern("^\"")
private val characterEscape by seqMap(char('\\'), any())
private val character by or(ref(characterEscape), ref(characterRaw))
private val `string` by seq(
char('"'),
character.star(),
char('"')) { _, it, _ -> it}


private val empty = ref(space).star()
private val cell by seq(atom, cells)
private val cells by or(ref(cell), ref(empty))

private val numberToken by seqMap(
ref(anyOf("-+")).optional(),
char('0') or digit().plus(),
char('.').seq(digit().plus()).optional() &
anyOf('eE').seq(anyOf('-+').optional()).seq(digit().plus()).optional()
)
private val number = ref(numberToken).flatten("Number expected")

private val list by seqMap(
char('('),
cell,
char(')'),
) { _, it, _ -> it.elements }


private val atomChoice: Parser<Any?> by or(
list,
number,
string,
symbol,
quote,
quasiquote,
unquote,
splice
)

val start by atomChoice.star().end()
}