cmark-writer 0.8.0

//! New node processor implementation
//!
//! Processor system rewritten with new trait architecture

use crate::ast::Node;
use crate::error::{WriteError, WriteResult};
use crate::traits::{
    BlockNodeProcessor, ConfigurableProcessor, InlineNodeProcessor, NodeProcessor, Writer,
};

/// Block processor configuration
#[derive(Debug, Clone)]
pub struct BlockProcessorConfig {
    /// Whether to ensure trailing newlines
    pub ensure_trailing_newlines: bool,
    /// Block separator
    pub block_separator: String,
}

impl Default for BlockProcessorConfig {
    fn default() -> Self {
        Self {
            ensure_trailing_newlines: true,
            block_separator: "\n\n".to_string(),
        }
    }
}

/// Inline processor configuration
#[derive(Debug, Clone)]
pub struct InlineProcessorConfig {
    /// Enable strict validation mode
    pub strict_validation: bool,
    /// Allow newlines in inline elements
    pub allow_newlines: bool,
}

impl Default for InlineProcessorConfig {
    fn default() -> Self {
        Self {
            strict_validation: true,
            allow_newlines: false,
        }
    }
}

/// Enhanced block node processor
#[derive(Debug)]
pub struct EnhancedBlockProcessor {
    config: BlockProcessorConfig,
}

impl EnhancedBlockProcessor {
    /// Create a new block processor
    pub fn new() -> Self {
        Self {
            config: BlockProcessorConfig::default(),
        }
    }

    /// Create with custom configuration
    pub fn with_config(config: BlockProcessorConfig) -> Self {
        Self { config }
    }
}

impl Default for EnhancedBlockProcessor {
    fn default() -> Self {
        Self::new()
    }
}

impl NodeProcessor for EnhancedBlockProcessor {
    fn can_process(&self, node: &Node) -> bool {
        matches!(
            node,
            Node::Document(_)
                | Node::Heading { .. }
                | Node::Paragraph(_)
                | Node::BlockQuote(_)
                | Node::CodeBlock { .. }
                | Node::UnorderedList(_)
                | Node::OrderedList { .. }
                | Node::ThematicBreak
                | Node::Table { .. }
                | Node::HtmlBlock(_)
                | Node::LinkReferenceDefinition { .. }
        ) || matches!(node, Node::Custom(custom) if custom.is_block())
    }

    fn process_commonmark(
        &self,
        writer: &mut crate::writer::CommonMarkWriter,
        node: &Node,
    ) -> WriteResult<()> {
        match node {
            Node::Document(children) => {
                for (i, child) in children.iter().enumerate() {
                    if i > 0 {
                        writer.write_str("\n\n")?;
                    }
                    writer.write_node(child)?;
                }
                Ok(())
            }
            Node::Heading {
                level,
                content,
                heading_type,
            } => writer.write_heading(*level, content, heading_type),
            Node::Paragraph(content) => writer.write_paragraph(content),
            Node::BlockQuote(content) => writer.write_blockquote(content),
            Node::CodeBlock {
                language,
                content,
                block_type,
            } => writer.write_code_block(language, content, block_type),
            Node::UnorderedList(items) => writer.write_unordered_list(items),
            Node::OrderedList { start, items } => writer.write_ordered_list(items, *start, true),
            Node::ThematicBreak => writer.write_thematic_break(),
            #[cfg(feature = "gfm")]
            Node::Table {
                headers,
                alignments,
                rows,
            } => writer.write_table_with_alignment(headers, alignments, rows),
            #[cfg(not(feature = "gfm"))]
            Node::Table { headers, rows, .. } => writer.write_table(headers, rows),
            Node::HtmlBlock(content) => writer.write_html_block(content),
            Node::LinkReferenceDefinition {
                label,
                destination,
                title,
            } => writer.write_link_reference_definition(label, destination, title),
            Node::Custom(custom_node) if custom_node.is_block() => {
                // CustomNode implements CommonMarkRenderable
                custom_node.render_commonmark(writer)
            }
            _ => Err(WriteError::UnsupportedNodeType),
        }?;

        if self.config.ensure_trailing_newlines {
            // Newline handling is now context-aware and automatic
        }

        Ok(())
    }

    fn process_html(&self, writer: &mut crate::writer::HtmlWriter, node: &Node) -> WriteResult<()> {
        writer.write_node_internal(node).map_err(WriteError::from)
    }

    fn priority(&self) -> u32 {
        100
    }
}

impl BlockNodeProcessor for EnhancedBlockProcessor {
    fn ensure_block_separation(&self, writer: &mut dyn Writer) -> WriteResult<()> {
        writer.write_str(&self.config.block_separator)
    }
}

impl ConfigurableProcessor for EnhancedBlockProcessor {
    type Config = BlockProcessorConfig;

    fn configure(&mut self, config: Self::Config) {
        self.config = config;
    }

    fn config(&self) -> &Self::Config {
        &self.config
    }
}

/// Enhanced inline node processor
#[derive(Debug)]
pub struct EnhancedInlineProcessor {
    config: InlineProcessorConfig,
}

impl EnhancedInlineProcessor {
    /// Create a new inline processor
    pub fn new() -> Self {
        Self {
            config: InlineProcessorConfig::default(),
        }
    }

    /// Create with custom configuration
    pub fn with_config(config: InlineProcessorConfig) -> Self {
        Self { config }
    }
}

impl Default for EnhancedInlineProcessor {
    fn default() -> Self {
        Self::new()
    }
}

impl NodeProcessor for EnhancedInlineProcessor {
    fn can_process(&self, node: &Node) -> bool {
        matches!(
            node,
            Node::Text(_)
                | Node::Emphasis(_)
                | Node::Strong(_)
                | Node::InlineCode(_)
                | Node::Link { .. }
                | Node::Image { .. }
                | Node::Autolink { .. }
                | Node::ReferenceLink { .. }
                | Node::HtmlElement(_)
                | Node::SoftBreak
                | Node::HardBreak
        ) || matches!(node, Node::Custom(custom) if !custom.is_block())
            || (cfg!(feature = "gfm")
                && matches!(node, Node::Strikethrough(_) | Node::ExtendedAutolink(_)))
    }

    fn process_commonmark(
        &self,
        writer: &mut crate::writer::CommonMarkWriter,
        node: &Node,
    ) -> WriteResult<()> {
        if self.config.strict_validation {
            self.validate_inline_content(node)?;
        }

        match node {
            Node::Text(content) => writer.write_text_content(content),
            Node::Emphasis(content) => writer.write_emphasis(content),
            Node::Strong(content) => writer.write_strong(content),
            #[cfg(feature = "gfm")]
            Node::Strikethrough(content) => writer.write_strikethrough(content),
            Node::InlineCode(content) => writer.write_code_content(content),
            Node::Link {
                url,
                title,
                content,
            } => writer.write_link(url, title, content),
            Node::Image { url, title, alt } => writer.write_image(url, title, alt),
            Node::Autolink { url, is_email } => writer.write_autolink(url, *is_email),
            #[cfg(feature = "gfm")]
            Node::ExtendedAutolink(url) => writer.write_extended_autolink(url),
            Node::ReferenceLink { label, content } => writer.write_reference_link(label, content),
            Node::HtmlElement(element) => writer.write_html_element(element),
            Node::SoftBreak => writer.write_soft_break(),
            Node::HardBreak => writer.write_hard_break(),
            Node::Custom(custom_node) if !custom_node.is_block() => {
                custom_node.render_commonmark(writer)
            }
            _ => Err(WriteError::UnsupportedNodeType),
        }
    }

    fn process_html(&self, writer: &mut crate::writer::HtmlWriter, node: &Node) -> WriteResult<()> {
        writer.write_node_internal(node).map_err(WriteError::from)
    }

    fn priority(&self) -> u32 {
        50
    }
}

impl InlineNodeProcessor for EnhancedInlineProcessor {
    fn validate_inline_content(&self, node: &Node) -> WriteResult<()> {
        if !self.config.allow_newlines && !matches!(node, Node::SoftBreak | Node::HardBreak) {
            // Recursive function to check for newlines in text content
            fn check_for_newlines(node: &Node) -> Result<(), String> {
                match node {
                    // Direct text content nodes
                    Node::Text(content) => {
                        if content.contains('\n') {
                            return Err(format!("Text node: {}", content));
                        }
                    }
                    Node::InlineCode(content) => {
                        if content.contains('\n') {
                            return Err(format!("Inline code: {}", content));
                        }
                    }
                    Node::Autolink { url, .. } => {
                        if url.contains('\n') {
                            return Err(format!("Autolink URL: {}", url));
                        }
                    }
                    #[cfg(feature = "gfm")]
                    Node::ExtendedAutolink(url) => {
                        if url.contains('\n') {
                            return Err(format!("Extended autolink URL: {}", url));
                        }
                    }

                    // Nodes with child content that needs recursive checking
                    Node::Emphasis(children)
                    | Node::Strong(children)
                    | Node::Strikethrough(children) => {
                        for child in children {
                            check_for_newlines(child)?;
                        }
                    }
                    Node::Link {
                        content,
                        url,
                        title,
                        ..
                    } => {
                        // Check URL and title for newlines
                        if url.contains('\n') {
                            return Err(format!("Link URL: {}", url));
                        }
                        if let Some(title_text) = title {
                            if title_text.contains('\n') {
                                return Err(format!("Link title: {}", title_text));
                            }
                        }
                        // Check content recursively
                        for child in content {
                            check_for_newlines(child)?;
                        }
                    }
                    Node::ReferenceLink { content, label, .. } => {
                        // Check label for newlines
                        if label.contains('\n') {
                            return Err(format!("Reference link label: {}", label));
                        }
                        // Check content recursively
                        for child in content {
                            check_for_newlines(child)?;
                        }
                    }
                    Node::Image {
                        alt, url, title, ..
                    } => {
                        // Check URL and title for newlines
                        if url.contains('\n') {
                            return Err(format!("Image URL: {}", url));
                        }
                        if let Some(title_text) = title {
                            if title_text.contains('\n') {
                                return Err(format!("Image title: {}", title_text));
                            }
                        }
                        // Check alt text recursively
                        for child in alt {
                            check_for_newlines(child)?;
                        }
                    }

                    // HTML elements might contain text, but we allow them for now
                    Node::HtmlElement(_) => {
                        // HTML elements are allowed to contain newlines as they might be formatted
                    }

                    // Custom nodes - delegate validation to the custom node implementation
                    Node::Custom(_) => {
                        // Custom nodes should handle their own validation
                    }

                    // Break nodes are explicitly allowed
                    Node::SoftBreak | Node::HardBreak => {}

                    // Other nodes shouldn't appear in inline context, but we don't error here
                    _ => {}
                }
                Ok(())
            }

            if let Err(error_msg) = check_for_newlines(node) {
                return Err(WriteError::NewlineInInlineElement(error_msg.into()));
            }
        }
        Ok(())
    }
}

impl ConfigurableProcessor for EnhancedInlineProcessor {
    type Config = InlineProcessorConfig;

    fn configure(&mut self, config: Self::Config) {
        self.config = config;
    }

    fn config(&self) -> &Self::Config {
        &self.config
    }
}

/// Custom node processor
#[derive(Debug, Default)]
pub struct CustomNodeProcessor;

impl NodeProcessor for CustomNodeProcessor {
    fn can_process(&self, node: &Node) -> bool {
        matches!(node, Node::Custom(_))
    }

    fn process_commonmark(
        &self,
        writer: &mut crate::writer::CommonMarkWriter,
        node: &Node,
    ) -> WriteResult<()> {
        match node {
            Node::Custom(custom_node) => {
                custom_node.render_commonmark(writer)?;

                if custom_node.is_block() {
                    // Newline handling is now context-aware and automatic
                }

                Ok(())
            }
            _ => Err(WriteError::UnsupportedNodeType),
        }
    }

    fn process_html(&self, writer: &mut crate::writer::HtmlWriter, node: &Node) -> WriteResult<()> {
        match node {
            Node::Custom(custom_node) => {
                // Use the html_render method from CustomNode trait
                custom_node.html_render(writer)
            }
            _ => Err(WriteError::UnsupportedNodeType),
        }
    }

    fn priority(&self) -> u32 {
        200 // High priority for custom node processing
    }
}