48baf056b4
This way, we can keep of the order in which the rules were given, for resolving reduce/reduce conflicts.
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
#include "tree_sitter/compiler.h"
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namespace tree_sitter {
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namespace examples {
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using namespace tree_sitter::rules;
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static rule_ptr comma_sep(const rule_ptr &element) {
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return choice({
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seq({
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element,
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repeat(seq({ str(","), element })),
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}),
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blank(),
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});
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}
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Grammar javascript() {
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return Grammar({
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{ "program", repeat(sym("statement")) },
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{ "terminator", choice({ str(";"), str("\n") }) },
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{ "statement", choice({
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sym("if"),
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seq({ sym("expression"), _sym("terminator") }),
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seq({ sym("assignment"), _sym("terminator") }) }) },
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{ "if", seq({
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str("if"),
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str("("),
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sym("expression"),
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str(")"),
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sym("block")
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}) },
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{ "block", seq({
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str("{"),
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repeat(sym("statement")),
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str("}")
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}) },
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{ "assignment", seq({
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str("var"),
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sym("identifier"),
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str("="),
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sym("expression") })},
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{ "expression", choice({
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sym("literal") }) },
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{ "literal", choice({
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sym("object"),
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sym("array"),
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sym("string"),
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sym("number"),
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sym("true"),
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sym("false"),
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sym("null"), }) },
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{ "object", seq({
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str("{"),
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comma_sep(err(seq({
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sym("string"),
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str(":"),
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sym("expression") }))),
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str("}"), }) },
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{ "array", seq({
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str("["),
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comma_sep(err(sym("expression"))),
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str("]") }) },
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{ "string", pattern("\"([^\"]|\\\\\")+\"") },
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{ "identifier", pattern("[\\w_$]+") },
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{ "number", pattern("\\d+(.\\d+)?") },
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{ "null", str("null") },
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{ "true", str("true") },
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{ "false", str("false") },
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});
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}
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}
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}
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