66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
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extern crate proc_macro;
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use proc_macro::TokenStream;
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use quote::quote;
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use serde_json::Value;
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use std::env;
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use std::fs;
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use std::path::Path;
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use syn::{parse_macro_input, LitStr};
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#[proc_macro]
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pub fn generate_input_types(input: TokenStream) -> TokenStream {
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let input_string = parse_macro_input!(input as LitStr).value();
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// Validate JSON format
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let json: Value = match serde_json::from_str(&input_string) {
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Ok(json) => json,
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Err(e) => panic!("Invalid JSON input: {}", e),
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};
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// Convert the validated JSON back to a pretty-printed string
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let formatted_json = serde_json::to_string_pretty(&json).expect("Failed to serialize JSON");
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// Generate the output function
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let expanded = quote! {
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#[wasm_bindgen]
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pub fn get_input_types() -> String {
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String::from(#formatted_json)
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}
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};
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// Convert the generated code back to a TokenStream
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TokenStream::from(expanded)
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}
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#[proc_macro]
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pub fn generate_input_types_file(input: TokenStream) -> TokenStream {
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let file_path = syn::parse_macro_input!(input as syn::LitStr).value();
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// Retrieve the directory containing the Cargo.toml file
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let project_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
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let full_path = Path::new(&project_dir).join(&file_path);
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// Read the JSON file content
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let json_content = fs::read_to_string(full_path).unwrap_or_else(|err| {
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panic!(
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"Failed to read JSON file at '{}/{}': {}",
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project_dir, file_path, err
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)
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});
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// Optionally, validate that the content is valid JSON
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let _: Value = serde_json::from_str(&json_content)
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.unwrap_or_else(|_| panic!("JSON file contains invalid JSON"));
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// Generate the function that returns the JSON string
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let expanded = quote! {
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#[wasm_bindgen]
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pub fn get_input_types() -> String {
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String::from(#json_content)
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}
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};
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// Convert the generated code back to a TokenStream
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TokenStream::from(expanded)
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}
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