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We're currently being intentionally cautious about adding too many tests while these new parts of the system are still evolving and changing a lot, but the execGraphBuilder behavior is hopefully self-contained enough for a small set of basic tests to be more helpful than hurtful. We should extend this test, and add other test cases that involve more complicated interactions between different resource instances of different modes, once we feel that these new codepaths have reached a more mature state where we're more focused on localized maintenance than on broad system design exploration. Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package planning
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import (
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"bufio"
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"math"
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"strings"
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)
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// stripCommonLeadingTabs is a helper for tests that include constant strings
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// for comparison with the result of a [Graph.DebugRepr] call, so that we can
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// write the constant strings indentation to fit well with the surrounding
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// context while ignoring the extra leading tabs that causes.
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//
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// This only considers tabs -- ignoring any other kind of whitespace -- because
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// this is narrowly focused only on test code indentation and we always indent
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// code using tabs.
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func stripCommonLeadingTabs(s string) string {
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// We work in two passes here: first we scan over and find the smallest
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// number of leading tabs that all of the lines of the string have in
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// common, and then we do a second pass to build a new string with that
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// many leading tabs removed from each line.
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sc := bufio.NewScanner(strings.NewReader(s))
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sc.Split(bufio.ScanLines)
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minTabCount := math.MaxInt
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for sc.Scan() {
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line := sc.Text()
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trimmed := strings.TrimLeft(line, "\t")
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if len(strings.TrimSpace(trimmed)) == 0 {
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continue // empty lines and lines containing only whitespace are ignored
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}
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tabCount := len(line) - len(trimmed)
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if tabCount < minTabCount {
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minTabCount = tabCount
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}
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}
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// (No error check because strings.Reader reads cannot fail)
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if minTabCount == math.MaxInt {
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// If minTabCount is still the max then that suggests we didn't have
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// any non-empty lines at all, and so there's nothing useful we can do
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// here.
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return ""
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}
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trimmedPrefix := strings.Repeat("\t", minTabCount)
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var buf strings.Builder
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sc = bufio.NewScanner(strings.NewReader(s))
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sc.Split(bufio.ScanLines)
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for sc.Scan() {
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// No error check because strings.Builder writes cannot fail.
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buf.WriteString(strings.TrimPrefix(sc.Text(), trimmedPrefix))
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buf.WriteByte('\n')
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}
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// (No error check because strings.Reader reads cannot fail)
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return buf.String()
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}
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