Get the parser working in Rust

src/rust-base/.gitignore

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+target/

src/rust-base/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "peg"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af728fe826811af3b38c37e93de6d104485953ea373d656eebae53d6987fcd2c"
+dependencies = [
+ "peg-macros",
+ "peg-runtime",
+]
+
+[[package]]
+name = "peg-macros"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4536be147b770b824895cbad934fccce8e49f14b4c4946eaa46a6e4a12fcdc16"
+dependencies = [
+ "peg-runtime",
+ "proc-macro2",
+ "quote",
+]
+
+[[package]]
+name = "peg-runtime"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9b0efd3ba03c3a409d44d60425f279ec442bcf0b9e63ff4e410da31c8b0f69f"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47aa80447ce4daf1717500037052af176af5d38cc3e571d9ec1c7353fc10c87d"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "storybook"
+version = "0.1.0"
+dependencies = [
+ "peg",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

src/rust-base/Cargo.toml

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+[package]
+name = "storybook"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+peg = "0.8.0"

src/rust-base/my_header.h

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+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+struct Page;
+
+template<typename T = void, typename E = void>
+struct Result;
+
+template<typename T = void>
+struct Vec;
+
+extern "C" {
+
+Result<Vec<Page>, ParseError<LineCol>> parse_story(const str *string);
+
+} // extern "C"

src/rust-base/src/lib.rs

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+#[derive(Debug, PartialEq)]
+pub struct Page {
+    id: String,
+    body: String,
+    footer: Footer,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Footer {
+    Ending,
+    Goto(String),
+    Choices(Vec<Choice>)
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Choice {
+    option: u32,
+    flavor: String,
+    redirect: String,
+    stat_check: Option<StatCheck>,
+    stat_change: Option<StatChange>
+}
+
+#[derive(Debug, PartialEq)]
+pub struct StatCheck {
+    stat: String,
+    value: i32,
+    rel: char,
+}
+
+#[derive(Debug, PartialEq)]
+pub struct StatChange {
+    stat: String,
+    addend: i32,
+}
+
+
+peg::parser! {
+    grammar storybook_parser() for str {
+        pub rule story() -> Vec<Page>
+            = blankline()* ps:page()+ eof() { ps }
+        rule page() -> Page
+            = h:header() b:body() f:footer() blankline()* {
+                Page {
+                    id: h,
+                    body: b,
+                    footer: f
+                }
+            }
+        rule header() -> String
+            = i:id() __ blankline()* { i }
+        rule id() -> String
+            = i:$(['A'..='Z'|'_']+) _ { String::from(i) }
+        rule body() -> String
+            = b:$((!footer() [_])+) { String::from(b.trim()) }
+        rule footer() -> Footer
+            = "THE END" __ { Footer::Ending } /
+              "GOTO" _ i:id() __ { Footer::Goto(i) } /
+              c:choice()+ { Footer::Choices(c) }
+        rule choice() -> Choice
+            = o:$(['0'..='9']+) ")" _ f:$((!redirect() [_])+) r:redirect() __ {
+                let (redirect, stat_change, stat_check) = r;
+                Choice {
+                    option: o.parse().unwrap(),
+                    flavor: String::from(f.trim()),
+                    redirect,
+                    stat_change,
+                    stat_check
+                }
+            }
+        rule redirect() -> (String, Option<StatChange>, Option<StatCheck>)
+            = ck:stat_check()? "[" i:id() "]" _ cg:stat_change()? { (i, cg, ck) }
+        rule stat_change() -> StatChange
+            = "(" a:$(['+'|'-'] ['0'..='9']+) _ n:stat_name() ")" _ { StatChange {
+                addend: a.parse().unwrap(),
+                stat: n
+            }}
+        rule stat_check() -> StatCheck
+            = "<" n:stat_name() _ v:$(['0'..='9']+) r:['+'|'-'] ">" _ { StatCheck {
+                stat: n,
+                value: v.parse().unwrap(),
+                rel: r
+            }}
+        rule stat_name() -> String
+            = n:$(['a'..='z'|'A'..='Z']+) { String::from(n) }
+        rule blankline()
+            = _ __
+        rule _
+            = [' '|'\t']*
+        rule __
+            = "\r\n" / "\r" / "\n"
+        rule eof()
+            = ![_]
+    }
+}
+
+pub fn parse_story(string: &str) -> Result<Vec<Page>,
+                                           peg::error::ParseError<
+                                                   peg::str::LineCol>> {
+    storybook_parser::story(string)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    const STORY: &str = r"
+START
+
+One day, Dane took a really big shit.
+
+GOTO DIALOG
+
+DIALOG
+
+Dane: 'Wow, that was a really big shit!'
+
+1) Die [DIE]
+2) Don't die <Strength 100+> [DONTDIE] (-1 Honor)
+
+DIE
+
+Then he died.
+
+Fuck you, Dane!
+
+THE END
+";
+    #[test]
+    fn storybook_parser_test() {
+        assert_eq!(
+            parse_story(STORY),
+            Ok(vec![
+                Page {
+                    id: String::from("START"),
+                    body: String::from("One day, Dane took a really big shit."),
+                    footer: Footer::Goto(String::from("DIALOG"))
+                },
+                Page {
+                    id: String::from("DIALOG"),
+                    body: String::from("Dane: 'Wow, that was a really big shit!'"),
+                    footer: Footer::Choices(vec![
+                        Choice {
+                            option: 1,
+                            flavor: String::from("Die"),
+                            redirect: String::from("DIE"),
+                            stat_check: None,
+                            stat_change: None,
+                        },
+                        Choice {
+                            option: 2,
+                            flavor: String::from("Don't die"),
+                            redirect: String::from("DONTDIE"),
+                            stat_change: Some(StatChange {
+                                stat: String::from("Honor"),
+                                addend: -1,
+                            }),
+                            stat_check: Some(StatCheck {
+                                stat: String::from("Strength"),
+                                value: 100,
+                                rel: '+',
+                            })
+                        }
+                    ])
+                },
+                Page {
+                    id: String::from("DIE"),
+                    body: String::from("Then he died.\n\nFuck you, Dane!"),
+                    footer: Footer::Ending,
+                }
+            ])
+        );
+    }
+}