88 lines
2.7 KiB
Text
88 lines
2.7 KiB
Text
# calc_terms.ludic - calc()'s products and its terms: a number with its unit, a bracket, a nested
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# calc(), a minus in front; a product needs a plain number on one side, and a quotient a plain number
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# or a length on its right (a length over a length is a plain number, as CSS's typed division makes)
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function ca_product() -> CaVal {
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var a = ca_factor()
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while ca_bad == "" {
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ca_ws()
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if ca_i >= len(ca_s) or (ca_s[ca_i] != 42 and ca_s[ca_i] != 47) { return a }
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let div = ca_s[ca_i] == 47
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ca_i += 1
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let b = ca_factor()
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if div and not b.bare and not a.bare and a.pct == 0.0 and b.pct == 0.0 and b.px != 0.0 {
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a = ca_ratio(a.px / b.px)
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continue
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}
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if div and not b.bare {
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ca_bad = "a plain number, or a length under a length, after /"
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return a
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}
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if div and b.n == 0.0 {
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ca_bad = "a number that is not 0 after /"
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return a
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}
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if div { a = ca_scale(a, 1.0 / b.n) } else if a.bare { a = ca_scale(b, a.n) } else if b.bare { a = ca_scale(a, b.n) } else {
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ca_bad = "a plain number on one side of *"
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return a
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}
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}
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return a
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}
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# a length over a length is a plain number (100vw / 1800px)
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function ca_ratio(k: float) -> CaVal {
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let r = new CaVal
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r.n = k
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return r
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}
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function ca_scale(a: CaVal, k: float) -> CaVal {
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let r = new CaVal
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r.bare = a.bare
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r.n = a.n * k
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r.px = a.px * k
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r.pct = a.pct * k
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return r
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}
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function ca_factor() -> CaVal {
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ca_ws()
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if ca_i >= len(ca_s) {
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ca_bad = "a value"
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return new CaVal
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}
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let c = ca_s[ca_i]
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if c == 45 {
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ca_i += 1
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return ca_scale(ca_factor(), -1.0)
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}
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let f = ca_fn_at(ca_s, ca_i)
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if f == "min" or f == "max" or f == "clamp" { return ca_fn(f) }
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if c == 40 or f == "calc" {
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while ca_s[ca_i] != 40 { ca_i += 1 }
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ca_i += 1
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let v = ca_sum()
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ca_ws()
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if ca_i < len(ca_s) and ca_s[ca_i] == 41 { ca_i += 1 } else if ca_bad == "" { ca_bad = "a closing )" }
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return v
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}
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return ca_number()
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}
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# 12, 1.5em, 50%, 20vw
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function ca_number() -> CaVal {
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let at = ca_i
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while ca_i < len(ca_s) and ((ca_s[ca_i] >= 48 and ca_s[ca_i] <= 57) or ca_s[ca_i] == 46) { ca_i += 1 }
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let num_end = ca_i
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while ca_i < len(ca_s) and ((ca_s[ca_i] >= 97 and ca_s[ca_i] <= 122) or ca_s[ca_i] == 37) { ca_i += 1 }
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let r = new CaVal
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if num_end == at {
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ca_bad = "a number"
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return r
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}
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let word: string = ca_s[at..ca_i]
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let unit: string = ca_s[num_end..ca_i]
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if unit == "" {
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r.n = el_num(word)
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return r
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}
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r.bare = false
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if unit == "%" { r.pct = el_num(word) } else if unit == "px" or unit == "em" or unit == "rem" or unit == "vw" or unit == "vh" { r.px = el_unit(word) } else { ca_bad = `a unit calc() knows, not {unit}` }
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return r
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}
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