sourcemap/
encoder.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
use std::io::Write;

use serde_json::Value;

use crate::errors::Result;
use crate::jsontypes::{RawSection, RawSectionOffset, RawSourceMap};
use crate::types::{DecodedMap, SourceMap, SourceMapIndex};
use crate::vlq::encode_vlq;

pub trait Encodable {
    fn as_raw_sourcemap(&self) -> RawSourceMap;
}

pub fn encode<M: Encodable, W: Write>(sm: &M, mut w: W) -> Result<()> {
    let ty = sm.as_raw_sourcemap();
    serde_json::to_writer(&mut w, &ty)?;
    Ok(())
}

fn encode_vlq_diff(out: &mut String, a: u32, b: u32) {
    encode_vlq(out, i64::from(a) - i64::from(b))
}

fn serialize_mappings(sm: &SourceMap) -> String {
    let mut rv = String::new();
    // dst == minified == generated
    let mut prev_dst_line = 0;
    let mut prev_dst_col = 0;
    let mut prev_src_line = 0;
    let mut prev_src_col = 0;
    let mut prev_name_id = 0;
    let mut prev_src_id = 0;

    for (idx, token) in sm.tokens().enumerate() {
        let idx = idx as u32;

        if token.get_dst_line() != prev_dst_line {
            prev_dst_col = 0;
            while token.get_dst_line() != prev_dst_line {
                rv.push(';');
                prev_dst_line += 1;
            }
        } else if idx > 0 {
            if Some(&token) == sm.get_token(idx - 1).as_ref() {
                continue;
            }
            rv.push(',');
        }

        encode_vlq_diff(&mut rv, token.get_dst_col(), prev_dst_col);
        prev_dst_col = token.get_dst_col();

        if token.has_source() {
            encode_vlq_diff(&mut rv, token.get_src_id(), prev_src_id);
            prev_src_id = token.get_src_id();
            encode_vlq_diff(&mut rv, token.get_src_line(), prev_src_line);
            prev_src_line = token.get_src_line();
            encode_vlq_diff(&mut rv, token.get_src_col(), prev_src_col);
            prev_src_col = token.get_src_col();
            if token.has_name() {
                encode_vlq_diff(&mut rv, token.get_name_id(), prev_name_id);
                prev_name_id = token.get_name_id();
            }
        }
    }

    rv
}

impl Encodable for SourceMap {
    fn as_raw_sourcemap(&self) -> RawSourceMap {
        let mut have_contents = false;
        let contents = self
            .source_contents()
            .map(|contents| {
                if let Some(contents) = contents {
                    have_contents = true;
                    Some(contents.to_string())
                } else {
                    None
                }
            })
            .collect();
        RawSourceMap {
            version: Some(3),
            file: self.get_file().map(|x| Value::String(x.to_string())),
            sources: Some(self.sources().map(|x| Some(x.to_string())).collect()),
            source_root: self.get_source_root().map(|x| x.to_string()),
            sources_content: if have_contents { Some(contents) } else { None },
            sections: None,
            names: Some(self.names().map(|x| Value::String(x.to_string())).collect()),
            mappings: Some(serialize_mappings(self)),
            x_facebook_offsets: None,
            x_metro_module_paths: None,
            x_facebook_sources: None,
            debug_id: self.get_debug_id(),
        }
    }
}

impl Encodable for SourceMapIndex {
    fn as_raw_sourcemap(&self) -> RawSourceMap {
        RawSourceMap {
            version: Some(3),
            file: self.get_file().map(|x| Value::String(x.to_string())),
            sources: None,
            source_root: None,
            sources_content: None,
            sections: Some(
                self.sections()
                    .map(|section| RawSection {
                        offset: RawSectionOffset {
                            line: section.get_offset_line(),
                            column: section.get_offset_col(),
                        },
                        url: section.get_url().map(str::to_owned),
                        map: section
                            .get_sourcemap()
                            .map(|sm| Box::new(sm.as_raw_sourcemap())),
                    })
                    .collect(),
            ),
            names: None,
            mappings: None,
            x_facebook_offsets: None,
            x_metro_module_paths: None,
            x_facebook_sources: None,
            debug_id: None,
        }
    }
}

impl Encodable for DecodedMap {
    fn as_raw_sourcemap(&self) -> RawSourceMap {
        match *self {
            DecodedMap::Regular(ref sm) => sm.as_raw_sourcemap(),
            DecodedMap::Index(ref smi) => smi.as_raw_sourcemap(),
            DecodedMap::Hermes(ref smh) => smh.as_raw_sourcemap(),
        }
    }
}