ratex_parser/functions/
rule.rs

1use std::collections::HashMap;
2
3use crate::error::{ParseError, ParseResult};
4use crate::functions::{define_function_full, ArgType, FunctionContext, FunctionSpec};
5use crate::parse_node::ParseNode;
6
7pub fn register(map: &mut HashMap<&'static str, FunctionSpec>) {
8    define_function_full(
9        map,
10        &["\\rule"],
11        "rule",
12        2,
13        1,
14        Some(vec![ArgType::Size, ArgType::Size, ArgType::Size]),
15        false,
16        true,
17        true,
18        false,
19        false,
20        handle_rule,
21    );
22}
23
24fn handle_rule(
25    ctx: &mut FunctionContext,
26    args: Vec<ParseNode>,
27    opt_args: Vec<Option<ParseNode>>,
28) -> ParseResult<ParseNode> {
29    let shift = opt_args.into_iter().next().flatten().and_then(|n| {
30        if let ParseNode::Size { value, .. } = n {
31            Some(value)
32        } else {
33            None
34        }
35    });
36
37    let mut args = args.into_iter();
38    let width = match args.next() {
39        Some(ParseNode::Size { value, .. }) => value,
40        _ => return Err(ParseError::msg("Expected size for \\rule width")),
41    };
42    let height = match args.next() {
43        Some(ParseNode::Size { value, .. }) => value,
44        _ => return Err(ParseError::msg("Expected size for \\rule height")),
45    };
46
47    Ok(ParseNode::Rule {
48        mode: ctx.parser.mode,
49        shift,
50        width,
51        height,
52        loc: None,
53    })
54}
ratex_parser/functions/rule.rs

ratex_parser/functions/
rule.rs
