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56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
//go:generate stringer -type=ChunkType
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package chunks
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import (
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"regexp"
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"strings"
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)
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var chunkMatcher = regexp.MustCompile(`{{\s*(.+?)\s*}}|{%\s*(\w+)(?:\s+((?:[^%]|%[^}])+?))?\s*%}`)
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// Scan breaks a string into a sequence of Chunks.
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func Scan(data string, pathname string) []Chunk {
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// TODO error on unterminated {{ and {%
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// TODO probably an error when a tag contains a {{ or {%, at least outside of a string
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var (
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p, pe = 0, len(data)
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si = SourceInfo{pathname, 1}
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out = make([]Chunk, 0)
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)
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for _, m := range chunkMatcher.FindAllStringSubmatchIndex(data, -1) {
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ts, te := m[0], m[1]
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if p < ts {
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out = append(out, Chunk{Type: TextChunkType, SourceInfo: si, Source: data[p:ts]})
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si.lineNo += strings.Count(data[p:ts], "\n")
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}
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source := data[ts:te]
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switch data[ts+1] {
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case '{':
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out = append(out, Chunk{
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Type: ObjChunkType,
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SourceInfo: si,
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Source: source,
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Args: data[m[2]:m[3]],
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})
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case '%':
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c := Chunk{
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Type: TagChunkType,
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SourceInfo: si,
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Source: source,
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Name: data[m[4]:m[5]],
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}
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if m[6] > 0 {
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c.Args = data[m[6]:m[7]]
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}
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out = append(out, c)
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}
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si.lineNo += strings.Count(source, "\n")
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p = te
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}
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if p < pe {
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out = append(out, Chunk{Type: TextChunkType, SourceInfo: si, Source: data[p:]})
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}
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return out
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}
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